EP1126083B1 - Formkörper - Google Patents

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Publication number
EP1126083B1
EP1126083B1 EP99918322A EP99918322A EP1126083B1 EP 1126083 B1 EP1126083 B1 EP 1126083B1 EP 99918322 A EP99918322 A EP 99918322A EP 99918322 A EP99918322 A EP 99918322A EP 1126083 B1 EP1126083 B1 EP 1126083B1
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EP
European Patent Office
Prior art keywords
molded article
pulp
layer
article
opening portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99918322A
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English (en)
French (fr)
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EP1126083A1 (de
EP1126083A4 (de
Inventor
Yoshiaki Kao Corp. Res. Lab. KUMAMOTO
Shinji Kao Corp. Res. Lab. OTAKURA
Kenichi Kao Corp. Res. Lab. OTANI
Takehiko Kao Corp. Res. Lab. TOJO
Yukiya Kao Corp. Res. Lab. SATO
Tokuo Kao Corp. Res. Lab. TSUURA
Masataka Kao Corp. Res. Lab. ISHIKAWA
Toshiyuki Kao Corp. Res. Lab. SUGA
Shingo Kao Corp. Res. Lab. ODAJIMA
Masanori Kao Corp. Res. Lab. TAKITA
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Kao Corp
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Kao Corp
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Filing date
Publication date
Priority claimed from JP37371798A external-priority patent/JP3118708B2/ja
Priority claimed from JP37371598A external-priority patent/JP3118707B2/ja
Application filed by Kao Corp filed Critical Kao Corp
Publication of EP1126083A1 publication Critical patent/EP1126083A1/de
Publication of EP1126083A4 publication Critical patent/EP1126083A4/de
Application granted granted Critical
Publication of EP1126083B1 publication Critical patent/EP1126083B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
    • D21J3/10—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/10—Jars, e.g. for preserving foodstuffs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D23/00—Details of bottles or jars not otherwise provided for
    • B65D23/08—Coverings or external coatings
    • B65D23/0807—Coatings
    • B65D23/0814—Coatings characterised by the composition of the material
    • B65D23/0821—Coatings characterised by the composition of the material consisting mainly of polymeric materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • the present invention relates to a molded article mainly made of pulp.
  • Plastics are used as general materials of hollow containers, such as containers with a lid and bottles, for their excellent molding properties and productivity.
  • plastic hollow containers involve various problems associated with waste disposal, hollow containers made of pulp have been attracting attention as substitutes for plastic containers.
  • Pulp-made hollow containers are not only easy to dispose of but economical because they can be manufactured from used paper.
  • One of known methods for producing pulp-made hollow containers comprises making vertically split halves 7, 7' by pulp molding as shown in Fig. 20(a) and joining the two split parts together as shown in Fig. 20(b) to obtain a hollow container having the cross section of Fig. 20(c) .
  • thickness at the joint of the spit parts should be made larger than the other portions, or margins for joining should be prepared beforehand at the production of the split halves, so as to secure strength of the joints.
  • the increased thickness at the joint can sometimes fail to secure sufficient strength, causing a leak of the contents, unless the joining is carried out sufficiently. Additionally, seams appear on the joints to impair the appearance.
  • Japanese Patent Application Laid-Open Nos. 133972/79 and 302600/96 propose methods for producing pulp-made hollow containers, but the methods are not adequate for solving the above-described problems perfectly.
  • an object of the present invention is to provide a pulp molded article having high strength, excellent productivity, and satisfactory appearance.
  • the present invention has achieved the above object by providing a molded article comprising pulp and having an opening portion, a body portion, and a bottom portion, wherein the body portion has no seams, the outer and inner surfaces of the article are smooth, and the body portion has at least one cross-sectional diameter which is greater than a corresponding cross-sectional diameter of the opening portion, the corresponding cross-sectional diameter of the opening portion being located within the vertical plane which contains the cross-sectional diameter of the body portion
  • cross-sectional diameter of the body portion primarily denotes the length of a line across a cross section of the body portion, wherein the line passes through the center of the cross section.
  • cross-sectional diameter of the opening portion primarily means the length of a line across a cross section of the opening portion, wherein the line passes through the center of the cross section.
  • Fig. 1 shows a molded article 10 according to the first embodiment, which is a cylindrical bottle made mainly of pulp and composed of an opening portion 11, a body portion 12, and a bottom portion 13.
  • the body portion 12 has a part thereof narrowed.
  • the diameter of the narrow part is the smallest in the body portion 12 and is greater than that of the opening portion 11. That is, all the cross-sectional diameters of the body portion 12 of the molded article 10 of this embodiment are greater than corresponding cross-sectional diameters of the opening portion 11 located within the vertical plane which contains each of the cross-sectional diameters of the body portion.
  • the smallest diameter in the body portion 12 is 20 to 100 mm, particularly 40 to 80 mm
  • the diameter of the opening portion 11 is 10 to 50 mm, particularly 15 to 35 mm.
  • the molded article 10 has a uniform wall thickness in each of its vertical section and cross section.
  • the molded article 10 of the present embodiment has no thicker-walled part by the joint of the split parts as depicted in Fig. 3 . Accordingly, there is no joint seams by the joint of the split parts in the body portion 12 and over the portion from the body portion 12 to the bottom portion 13 as shown in Fig. 1 . There is thus provided a container with enhanced strength and satisfactory outer appearance.
  • the molded article 10 has a screw thread mating a cap around the outer wall of the opening portion 11.
  • the vertical-sectional contour of the screw thread is trapezoidal.
  • the vertical-sectional contour of the screw thread is not limited to a trapezoid and can be a triangle or a rectangle in accordance with the strength of the opening portion 11 or the productivity of the molded article 10 (e.g., easiness with which the screw thread is dried or easiness with which the shape is transferred).
  • the screw thread preferably has a trapezoidal contour.
  • the molded article 10 has smooth outer and inner surfaces.
  • the surface smoothness will secure satisfactory adhesion between the surface(s) and the plastic layer. Further, the surface smoothness would facilitate neat printing on the outer surface and also provides better outer appearance.
  • the terminology "smooth” as used herein means that the surface profile of the outer and inner surfaces of a container is such that the center-line average roughness (Ra, JIS B0601) is 50 ⁇ m or less, and the maximum height (Rmax JIS B 0601) is 500 ⁇ m or less.
  • the molded article 10 has right angles between the body portion 12 and the bottom portion 13. That is, the tapering angle of the body portion 12 is 0°.
  • the total height of the molded article 10 is 50 mm or more, preferably 100 mm or more.
  • the molded article 10 is made mainly of pulp. It can be 100% pulp-made. Where other materials are used in addition to pulp, the amount of the other materials is 1 to 70% by weight, preferably 5 to 50% by weight.
  • the other materials include inorganic substances, such as talc and kaolinite, inorganic fibers, such as glass fiber and carbon fiber, synthetic resin powders or fibers, such as polyolefins, non-wood or plant fibers, and polysaccharides.
  • the molded article 10 be made from a slurry, i.e., a paper stock, containing pulp fiber having an average fiber length of 0.8 to 2.0 mm, a Canadian Standard Freeness of 100 to 600 cc, and such a frequency distribution of fiber length as comprises 20 to 90%, based on the total fiber, of fibers whose length ranges from 0.4 mm to 1.4 mm and 5 to 50%, based on the total fiber, of fibers whose length is longer than 1.4 mm and not longer than 3.0 mm from the standpoint that cracks will not develop during papermaking to provide pulp molded articles excellent in surface smoothness.
  • a slurry i.e., a paper stock, containing pulp fiber having an average fiber length of 0.8 to 2.0 mm, a Canadian Standard Freeness of 100 to 600 cc, and such a frequency distribution of fiber length as comprises 20 to 90%, based on the total fiber, of fibers whose length ranges from 0.4 mm to 1.4 mm and 5 to 50%, based on the total fiber,
  • the pulp fibers it is preferred for the pulp fibers to have an average length of 0.8 to 2.0 mm, particularly 0.9 to 1.8 mm, especially 1.0 to 1.5 mm. If the average fiber length is less than 0.8 mm, cracks tend to develop on the surface of the molded article during papermaking or drying, or the molded article tends to have poor mechanical properties such as impact strength. If the average fiber length exceeds 2.0 mm, the pulp deposited body formed by papermaking tends to have unevenness of thickness only to provide a molded article with poor surface smoothness.
  • the term "average fiber length" as used herein is a value obtained by measuring a frequency distribution of pulp fiber length and calculating an arithmetic mean from the distribution.
  • the pulp fiber prefferably has a freeness of 100 to 600 cc, particularly 200 to 500 cc, especially 300 to 400 cc.
  • a freeness less than 100 cc is so low that speed-up of the molding cycle tends to be difficult, and dewatering of the molded article tends to be insufficient.
  • a freeness exceeding 600 cc is so high that the pulp deposited body formed by papermaking tends to suffer from unevenness of thickness.
  • the pulp fiber prefferably has such a fiber length frequency distribution as comprises 20 to 90%, based on the total fiber, of fibers whose length is within a range of from 0.4 mm to 1.4 mm (hereinafter referred to as range A) and 5 to 50%, based on the total fiber, of fibers whose length is longer than 1.4 mm and not longer than 3.0 mm (hereinafter referred to as range B).
  • range A 0.4 mm to 1.4 mm
  • range B 3 to 3.0 mm
  • Fig. 4 furnishes an example of fiber length frequency distribution curves of pulp fibers preferably used in the molded article of the present invention.
  • the ratio of the area in range A (indicated with slant lines) to the total area in the frequency distribution curve is equivalent to the proportion (%) of the pulp fibers whose length falls within range A.
  • the ratio of the area in range B (indicated with slant lines) to the total area in the frequency distribution curve is equivalent to the proportion (%) of the pulp fibers whose length falls within range B.
  • the pulp fiber prefferably has such a frequency distribution as has peaks P A and P B in ranges A and B, respectively, as represented by Fig. 4 .
  • Pulp fibers having the aforesaid average fiber length, freeness and fiber length frequency distribution can be obtained by selecting, for example, the kind of the fiber (from, e.g., NBKP, LBKP, used paper pulp, etc.), beating conditions, conditions of blending two or more kinds of pulp, and the like. It is particularly preferred to prepare the above-described pulp fiber by blending relatively long pulp fibers having an average fiber length of 1.5 to 3.0 mm and relatively short pulp fibers having an average fiber length of 0.3 to 1.0 mm at a ratio (the former/the latter) of 90/10 to 40/60 (by weight) for obtaining a molded article having high surface smoothness.
  • the kind of the fiber from, e.g., NBKP, LBKP, used paper pulp, etc.
  • beating conditions conditions of blending two or more kinds of pulp, and the like. It is particularly preferred to prepare the above-described pulp fiber by blending relatively long pulp fibers having an average fiber length of 1.5 to 3.0 mm and relatively
  • the molded article 10 preferably has a density (i.e., the density of the wall of the container) of 0.4 to 2.0 g/cm 3 to have suitable rigidity satisfying mechanical properties such as tensile strength and compressive strength. Still preferably the density is 0.6 to 1.5 g/cm 3 to secure an excellent feel on use. A particularly preferred density is 0.8 to 1.5 g/cm 3 . With the density falling in the above range, the molded article 10 has a reduced void to inhibit penetration of liquid thereby exhibiting improved water resistance and barrier properties. Further, the molded article 10 has improved appearance making a good impression, improved surface properties, such as resistance to pulp fiber fluffing, and improved surface smoothness and surface hardness.
  • the molded article 10 which has a moisture permeability of 100 g/(m 2 ⁇ 24 hrs) or less, preferably 60 g/(m 2 ⁇ 24 hrs) or less, as measured in accordance with JIS Z 0208, absorbs little moisture in the air and thereby retains moderate rigidity and protects the quality of the contents from deterioration due to water absorption.
  • the molded article 10 prefferably has a surface tension of 10 dyn/cm or less and water repellency (JIS P 8137) of R10.
  • the molded article having such a surface tension and a water repellency can be obtained by molding a paper stock comprising the pulp slurry into which additives such as a waterproofing agent and a water repellant have been incorporated.
  • the molded article 10 which has a tensile strength of 5 MPa or more, particularly 10 MPa or more, is preferred for inhibiting rupture due to shocks, etc.
  • the term "tensile strength" as used herein means a breaking strength measured in accordance with JIS P8113 in such a manner that a 15 mm wide by 140 mm long specimen cut out of an arbitrary portion of the molded article 10 is set on a tensile tester at a chuck distance of 100 mm and pulled at a pulling speed of 20 mm/min. In case where a molded article cannot afford a specimen of the above size, the size of a specimen to be measured can be changed appropriately.
  • the molded article 10 which has a specific compressive strength of 100 Nm 2 /g or more, particularly 110 Nm 2 /g or more, is preferred, for it hardly collapses when stacked up on top of another.
  • the term "specific compressive strength" as used herein is one measured in accordance with JIS P 8126.
  • the molded article 10 prefferably has such a drop strength that it does not suffer damage including a break and a crack even when dropped 10 times in the drop test specified in JIS Z 0217.
  • the opening portion of the molded article 10 preferably exhibits such strength that the force required for pressing the opening portion 11 from its side to give a deformation of 30 mm is 10 N or greater.
  • the molded article of the present embodiment is produced by pulp molding, particularly conveniently by depositing pulp on the inner wall of a mold having a cavity.
  • the steps for producing the molded article by this method are illustrated in sequence in Figs. 5(a) through (d) , in which (a) is the step of papermaking, (b) is the step of inserting a pressing member, (c) is the step of pressurizing and dewatering, and (d) is the step of opening a split mold to take out a pulp deposited body.
  • a pulp slurry is poured into a split mold composed of a pair of splits 3 and 4 each having a plurality of interconnecting holes 2 which connect the outer side thereof and the cavity 1.
  • the pulp slurry is a water dispersion of pulp fiber and, if necessary, other components.
  • the cavity configuration of the splits 3 and 4 is such that the resulting molded article may have a smaller diameter in the opening portion than in the body portion.
  • the splits 3, 4 are evacuated from the outside to deposit the pulp fiber on the inner wall of the splits.
  • a pulp deposited body 5 is built up on the inner wall of the splits.
  • a hollow stretchable pressing member 6 having elasticity is inserted into the splits 3, 4 while evacuating the splits 3, 4.
  • the pressing member 6 is to be inflated in the cavity like a balloon to press the pulp deposited body 5 onto the inner wall of the splits thereby transferring the inner configuration of the splits. Therefore, the pressing member 6 is made of urethane, fluorine rubber, silicone rubber, elastomers, etc., which are excellent in tensile strength, impact elasticity, stretchability, and the like.
  • a pressurizing fluid is fed into the pressing member 6 to inflate it.
  • the inflated pressing member 6 presses the pulp deposited body 5 onto the inner wall of the splits. While the pulp deposited body 5 is pressed onto the inner wall of the splits by the inflated pressing member, the configuration of the inner wall of the splits are transferred thereto. Since the pulp deposited body 5 is pressed from the cavity 1 side to the inner wall of the splits in this manner, the inner configuration of the split mold can be transferred to the pulp deposited body 5 with good precision however complicated the configuration may be.
  • the above-described pressurizing fluid includes compressed air (heated air), oil (heated oil) and other liquids.
  • the pressure for feeding the pressurizing fluid is 0.01 to 5 MPa, particularly 0.1 to 3 MPa.
  • the pressurizing fluid is withdrawn from the pressing member 6, whereupon the pressing member 6 shrinks automatically to its original size as shown in Fig. 5(d) .
  • the shrunken pressing member 6 is withdrawn from the cavity 1, and the splits 3, 4 are opened to take out the wet pulp deposited body 5 having the prescribed water content.
  • the pulp deposited body 5 thus taken out is then subjected to the step of heat drying.
  • the step of heat drying the same operation as in the papermaking step shown in Fig. 5 is conducted, except that papermaking and dewatering are not carried out. That is, a mold, which is composed of a set of splits butted together to form a cavity in conformity to the outer contour of an article to be molded, is heated to a prescribed temperature, and the wet pulp deposited body is fitted into the mold.
  • a pressing member similar to the pressing member 6 used in the papermaking step is put into the pulp deposited body, and a pressurizing fluid is fed into the pressing member to inflate it, whereby the pulp deposited body is pressed onto the inner wall of the cavity by the inflated pressing member.
  • the material of the pressing member and the pressure for feeding the pressurizing fluid can be the same as those used in the papermaking step.
  • the pulp deposited body is dried by heat.
  • the pressurizing fluid is withdrawn from the pressing member to shrink and take out the pressing member. The splits are opened to take out the molded article.
  • the molded article 10 thus produced is a cylindrical bottle of which the body portion 12 has a greater diameter than the opening portion 11.
  • the opening portion 11, the body portion 12 and the bottom portion 13 each have no joint seams, and these portions 11, 12 and 13 are integrally formed with no joint seams. Both the outer and the inner surfaces of the molded article 10 are smooth.
  • the molded article 10 of the second embodiment shown in Fig. 6 is a cylindrical bottle having a narrowed portion in its body portion 12.
  • the opening portion 11 has, in the area from the top edge 16 thereof to a prescribed depth d, a thick-walled portion 17 which is thicker than the body portion 12 and the bottom portion 13.
  • the thick-walled portion 17 is continuous along the whole circumference of the opening portion 11.
  • the thick-walled portion 17 may be discontinuous.
  • the thick-walled portion 17 can be formed over the whole area of the opening portion 11 from the top edge 16 in the depth direction of the opening portion 11, but the area from the top edge 16 to the prescribed depth d shown in Fig. 6 is sufficient as long as sufficient mechanical strength is secured.
  • a sufficient depth d is usually 0.5 to 50 mm, preferably 5.0 to 30 mm, while dependent on the use, the shape and the like of the molded article.
  • the thick-walled portion 17 projects to the inward side of the molded article 10.
  • the degree of projection represented by the width x of the projection (see Fig. 6 ) from the inner wall of the portion having no thick-walled portion 17 in the opening portion 11 in the horizontal direction, is 0.5 to 5.0 mm, preferably 1.0 to 3.0 mm, which suffices to secure the mechanical strength of the opening portion 11.
  • the top edge 16 of the opening portion 11 can have an increased area and offer an increased sealing surface area, which enhances the adhesive strength to sealing paper, etc. when it is sealed.
  • the opening portion 11 secures sufficient mechanical strength with the depth d and the width x of the projection being such that d/x is from 0.1 to 100, preferably 1 to 30.
  • the part of the opening portion 11 that is deeper than the depth d may be tapered with the width x of the projection gradually decreasing thereby sloping the inner wall of the opening portion 11 as shown in Fig. 6 .
  • the top edge 16 of the opening portion 11 it is preferred for the top edge 16 of the opening portion 11 to have a smooth surface to secure improved sealability where it is sealed with sealing paper, etc.
  • the top edge 16 secures sufficient sealability with such smoothness as to have a center-line average roughness (Ra) of about 50 ⁇ m or smaller and a maximum height (Rmax) of about 500 ⁇ m or smaller.
  • the top edge 16 can be made smooth by, for example, a post treatment such as polishing by a prescribed means after the production of the molded article 10.
  • a sufficiently smooth top edge 16 can be obtained without the above-described post treatment by producing the molded article by the use of the papermaking mold hereinafter described.
  • the molded article 10 of the present embodiment is preferably produced by use of a papermaking mold which comprises:
  • Fig. 7 shows a perspective exploded view of the mold used to produce the molded article of the present embodiment.
  • the mold comprises a set of splits 3 and 4 having the same structure as the splits 3 and 4 shown in Fig. 5 , except that the cavity configuration is different, and a mold 27 for causing stagnation (hereinafter "stagnation-causing mold") to be inserted from the outside into the cavity to form a space, where a slurry stagnates, between the inner wall of the cavity and the stagnation-creating mold. While not shown in Fig. 7 , the inner wall of the split 4 has the same structure as that of the other split 3.
  • the split 3 is composed of a papermaking part 21A and a manifold part 21B.
  • the papermaking part 21A is fitted into the manifold part 21B to make up the split 3.
  • a manifold 21C is formed between the papermaking part 21A and the manifold part 21B.
  • the inner side of the papermaking part 21A may be covered with a net of prescribed size of mesh.
  • a plurality of interconnecting holes 24, 24, ... are regularly pierced through the papermaking part 21A from the inner to the outer surfaces. These interconnecting holes 24 connect with the manifold 21C.
  • a plurality of suction holes 21D are also pierced in both sides of the manifold part 21B thereby to form interconnecting passageways in the split 3 which connect the outside of the manifold part 21B and the inner surface of the papermaking part 21A.
  • a cavity 1 is formed in the inner side thereof in conformity to the contour of an article to be molded.
  • the part of the cavity 1 that corresponds to the opening portion 11 of the molded article (hereinafter referred to as a cavity part corresponding to an opening portion) has an opening open to the outside.
  • a wall 27B for making the slurry stagnant (hereinafter "a slurry stagnation wall”, described later) of the stagnation-causing mold 27.
  • the inner side of the cavity part corresponding to the opening portion has grooves having a configuration corresponding to a screw thread.
  • the stagnation-causing mold 27 is composed of a rectangular top plate 27A and a cylindrical slurry stagnation wall 27B hanging from approximately the center portion of the lower side of the top plate 27A.
  • the inner side of the slurry stagnation wall 27B forms a hollow cylinder which vertically pierces the stagnation-causing mold 27 and which serves as a gate 27C through which a slurry is poured into the mold.
  • the slurry stagnation wall 27B of the stagnation-causing mold 27 is inserted into the cavity part corresponding to the opening portion, and the lower side of the top plate 27A and the upper end of the split mold 3, 4 are brought into contact to complete the mold.
  • the diameter of the slurry stagnation wall 27B is smaller than that of the cavity part corresponding to the opening portion. Therefore, with the slurry stagnation wall 27B inserted into the cavity part corresponding to the opening portion, an annular space 28 in which a slurry stagnates is formed between the inner wall of that part of the cavity and the outer side of the slurry stagnation wall 27B.
  • Figs. 9(a) and (b) illustrate a part of the papermaking step, one of the steps for producing the molded article 10 by use of the above-described mold, wherein (a) is the papermaking step, and (b) is the step of opening the mold and taking out a pulp deposited body.
  • part of the mold is omitted from the illustration for the sake of simplicity.
  • an injection pump (not shown) is started to suck up a pulp slurry from a pulp slurry storage tank (not shown) and inject the pulp slurry under pressure into the mold through the slurry gate 27C.
  • the cavity 1 is evacuated by suction from the outside of the splits 3 and 4, thereby to suck up the water content of the pulp slurry and to build up pulp fibers on the inner wall of the cavity 1.
  • the pulp slurry goes around to fill the annular space 28 formed between the outer side of the slurry stagnation wall 27B and the inner side of the cavity part corresponding to the opening portion and easily stays there, making more amount of the pulp fibers accumulate there than on the other parts of the inner side of the cavity 1.
  • the pulp slurry pressure is equal in every part of the cavity 1 so that the annular space 28 can sufficiently be filled with the pulp slurry. It follows that the pulp deposited body 5 formed on the inner wall of the cavity 1 has a thicker wall in the portion corresponding to the vicinities of the top edge of the opening portion of the resulting molded article than in the other portions. The thickness of the thicker portion corresponds to the breadth of the annular space 28. Then, the same steps as the step of inserting a pressing member and the step of pressing and dewatering shown in Figs. 5(b) and (c) are carried out. As shown in Fig. 6 , the resulting molded article 10 can have sufficiently enhanced strength in its thick-walled portion 17 near the top edge 16 of the opening portion 11 particularly through the pressing and dewatering step.
  • the pressurizing fluid in the pressing member 6 is withdrawn, and the pressing member 6 is taken out from the cavity 1 as shown in Fig. 9(b) .
  • the mold is opened, and the pulp deposited body 5 in a wet state with a prescribed water content is taken out. Thereafter, the pulp deposited body 5 is forwarded to the step of heat drying in the same manner as in the process for producing the molded article of the first embodiment to obtain the molded article 10.
  • the molded article 10 thus produced has a thick-walled portion 17 in the opening portion 11 from the top edge 16 to the prescribed depth d, which is thicker than the body portion 12 and the bottom portion 13. Further, the top edge 16 has a smooth surface without being given any special post treatment so that it exhibits sufficient adhesive strength when sealed with sealing paper, etc.
  • the thick-walled portion 17 in the molded article 10 of the present embodiment may project both inward and outward.
  • the part of the thick-walled portion projecting outward can serve as, for example, a projection for fitting a cap used as needed.
  • Fig. 10 is a vertical-sectional view of the molded article according to the third embodiment of the present invention.
  • the molded article 10 of this embodiment is a carton box having an opening portion 11 in the upper portion thereof.
  • the body portion 12 and the bottom portion 13 connect via a curved portion 12' to give the molded article 10 increased impact strength.
  • the radius of curvature of the curved portion 12' is preferably 0.5 mm or more, particularly 5 mm or more, especially 7 mm or more, from the standpoint of improvements on impact strength, drying efficiency, surface finish of the molded article, and adhesion to a plastic film used in the fourth embodiment hereinafter described.
  • the cross section of the molded article 10 is a rectangle with its four corners rounded to give the molded article 10 increased impact strength.
  • the radius of curvature of the four corners is preferably 0.5 mm or more, particularly 5 mm or more, especially 7 mm or more, for the same reasons as described as for the curved portion 12'.
  • the four sides of the rectangle are gently curved slightly outward.
  • the body portion 12 has a continuous recess 29 around its circumference to make the molded body 10 easy to hold.
  • the angle ⁇ between the plane of contact B of the bottom portion 13 and the outer surface of every side wall of the body portion 12 is more than 85°, preferably 89° or more (about 90° in Fig. 10 ) in any wall of the front and rear side walls and the left and right walls, and the height h (see Fig. 10 ) of the body portion 12 is 50 mm or more, preferably 100 mm or more.
  • the angle ⁇ can exceed 90°.
  • the molded article 10 of the present embodiment prefferably has a larger thickness at the corners in its vertical section and/or cross section than the other portions to improve the compressive strength (buckling strength) of the molded article 10 as a whole over the one having equal thickness in every portion.
  • the thickness T2 of the corners i.e., curved portions 12'
  • the thickness T1 of the body portion 12 i.e., T2>T1
  • T2/T1 is 1.5 to 2
  • the improvement on compressive strength of the whole molded article 10 can be secured.
  • the thickness T1 be 0.1 mm or greater for the molded article 10 to exhibit the minimum compressive strength required. It is required for the molded article 10 to have a prescribed compressive strength, considering that the molded articles 10 are to be transported or stacked up in a warehouse or a shop. Likewise, it is preferred that the molded article 10 has a larger thickness at the corners (T2) than in the other portions (thickness T1) also in its cross section at the body portion of the molded article 10 shown in Fig. 11 .
  • T1 and T2 and between ⁇ 1 and p2 can be established by, for instance, properly selecting the pressure or the amount of flow of the pressurizing fluid used in pressing with the pressing member 6, the material or shape of the pressing member 6, the shape of the molded article, and the like in carrying out the aforementioned preferred method for producing molded articles.
  • molded articles 10 which were produced so as to have the T1, T2, ⁇ 1, and p2 shown in Table 1 below in their cross section of the body portion (see Fig. 11 ) had the compressive strength shown in Table 1. It is seen that the compressive strength increases as the T2/T1 value increases and as the ⁇ 2/ ⁇ 1 value decreases. Moreover, the example 2 having a higher compressive strength is lighter.
  • the values T1, T2, ⁇ 1, and p2 are the respective averages of values measured on four points of the body portion in the height direction.
  • the molded article 10 of the fourth embodiment which is shown in Fig. 12 has a thin plastic layer on its outer surface 14 and inner surface 15.
  • Such plastic layers not only give the molded article 10 further increased strength but effectively prevent leaks of the contents. Because the outer surface 14 and the inner surface 15 of the molded article 10 are smooth, the plastic layers can be satisfactorily adhered to the outer surface 14 and the inner surface 15.
  • the thickness of each plastic layer is selected appropriately according to the wall thickness of the molded article 10, the kind of the contents and the like, it is usually 5 to 300 ⁇ m, particularly 10 to 200 ⁇ m, especially 20 to 100 ⁇ m.
  • the two plastic layers may be the same or different in thickness.
  • the materials constituting each plastic layer include various thermoplastic synthetic resins such as polyethylene and polypropylene, emulsion latices such as an acrylic emulsion, and waxes such as a hydrocarbon wax.
  • a plastic layer is formed by laminating with a plastic film
  • an appropriate material is selected according to the purpose of laminating, for example imparting water resistance or gas barrier properties.
  • a film of a polyolefin, e.g., polypropylene or polyethylene, a polyester, e.g., polyethylene terephthalate or polybutylene terephthalate, polystyrene, polycarbonate, etc. can be used.
  • a multilayer film composed of a plurality of films made of these materials can also be used.
  • a plastic layer can be formed on the inner surface of the molded article 10 by, for example, replacing the pressing member 6 having elasticity used in the method of producing a molded article shown in Fig. 5 with a pressing member of bag form made of a plastic film of polyethylene or polypropylene, etc., the plastic film having aluminum or silica deposited thereon, the plastic film laminated with aluminum foil, etc., and the like. After pressing the pulp deposited body 5, such a pressing member of bag form is not taken out but superposed on the inner surface of the pulp deposited body 5 to thereby form a plastic layer on the inner surface of the molded article 10.
  • a plastic layer can also be formed on the inner surface of the molded article 10 by replacing the elastic pressing member with a plastic closed-end cold parison (preformed parison) having been preheated to a predetermined temperature.
  • the parison is inserted into the pulp deposited body 5, and a pressurizing fluid is fed into the parison to inflate it.
  • the plastic film is thus adhered to the inner surface of the pulp deposited body to thereby form a plastic layer on the inner surface of the molded article 10.
  • Fig. 13 As an alternative for laminating the inner surface of the molded article 10 with a plastic film, vacuum forming or pressure forming is also useful.
  • the method depicted in Fig. 13 is suitable.
  • a first vacuum chamber 30 and a second vacuum chamber 40 are used as shown in Fig. 13(a) .
  • the first vacuum chamber 30 has an opening 31 at the top and a through-hole 32 in the side wall near the bottom.
  • the through-hole 32 is connected to a suction means not shown.
  • the inner contour of the cross section of the opening 31 is made slightly larger than the outer contour of the cross section of the opening portion 11 of the molded article 10.
  • the second vacuum chamber 40 has an opening 41 at the bottom.
  • the opening 41 of the second vacuum chamber 40 is shaped to close the opening 31 of the first vacuum chamber 30.
  • the inner contour of the cross section of the opening 41 is made larger than that of the opening 31 of the first vacuum chamber 30.
  • the upper side surface of the second vacuum chamber 40 has a plurality of through-holes 42, 42 ..., which are connected to a suction means not shown.
  • a heating means 43 such as an electric heater is provided on the inner wall of the upper side surface of the second vacuum chamber 40.
  • the inner surface of a hollow container 1 can be laminated with a plastic film by use of the vacuum chambers 30 and 40 as follows. As shown in Fig. 13(a) , a molded article 10 is placed in the first vacuum chamber 30 with its opening portion 11 up. The depth of the first vacuum chamber 30 is virtually the same as the height of the molded article 10 so that the upper opening edge of the placed molded article 10 and that of the first vacuum chamber 30 are located on almost the same plane.
  • a stretchable plastic film 50 in its unstretched state is placed to close the opening 31.
  • the plastic film 50 closes the opening 31 and also covers all the upper edge surface of the opening 31.
  • the second vacuum chamber 40 is set on the first vacuum chamber 30 with its opening 41 facing the plastic film 50. Since the first and the second vacuum chambers 30 and 40 are of the same shape in their cross sections, the plastic film 50 are held in between the periphery of the opening 31 of the first vacuum chamber 30 and the periphery of the opening 41 of the second vacuum chamber 40.
  • Each inner side of the first and the second vacuum chambers 30 and 40 is thus made air-tight.
  • the two vacuum chambers may be fastened together by a fixing means such as a metal fastener.
  • the inside of the second vacuum chamber 40 is then sucked by a suction means (not shown) connected to the through-holes 42, whereby the inside of the second vacuum chamber is evacuated, and the plastic film 50 is drawn up in the second vacuum chamber 40 and stretched gradually.
  • the plastic film 50 is further stretched and comes into close contact with the inner wall of the second vacuum chamber 40 as shown in Fig. 13(b) .
  • the stretching in this stage is preliminary.
  • the stretch ratio is decided appropriately in accordance with the shape of the molded article 10 on which the plastic film 50 is superposed.
  • the plastic film 50 when the plastic film 50 is preliminarily stretched with the ratio of the surface area of the preliminarily stretched plastic film 50 to that of the plastic film superposed on the molded article 10 (the former/the latter) being 3 to 0.7, particularly 2 to 0.9, laminating the molded article 10 with the plastic film 50 can be accomplished with improved adhesion, and laminating the molded article 10 having a complicated shape is carried out more easily.
  • the pressure (degree of vacuum) in the second vacuum chamber 40 is such that the plastic film 50 may be preliminarily stretched to come into intimate contact with the inner wall of the second vacuum chamber 40. While depending on the thickness and material of the plastic film 50, the pressure is generally 40 kPa or lower, preferably 1 to 1300 Pa.
  • the preliminarily stretched plastic film 50 While the preliminarily stretched plastic film 50 is in intimate contact with the inner wall of the second vacuum chamber 40, it is heated to a prescribed temperature by the heating means 43 provided on the inner wall of the upper side surface of the second vacuum chamber 40.
  • the plastic film 50 is softened by this heating to further secure the intimate contact of the plastic film 50 with the molded article 10 in laminating and to further facilitate laminating the molded article 10 having a complicated shape.
  • the heating temperature preferably ranges from (melting point + 30)°C to (melting point -70)°C, particularly from (melting point + 5)°C to (melting point - 30)°C.
  • the heating temperature preferably ranges from (Tg + 5)°C to (Tg + 150)°C, particularly (Tg + 10)°C to (Tg + 100)°C.
  • plastic film 50 can be superposed with closer contact on the molded article 10 without tearing.
  • the glass transition temperature of the material having the lowest glass transition temperature is taken as the above-described glass transition temperature.
  • the inside of the first vacuum chamber 30 is sucked by a suction means (not shown) connected to the through-hole 32. Since there is a gap between the inner wall of the opening 31 of the first vacuum chamber 30 and the outer wall of the opening portion 11 of the molded article 10, the inside and the outside of the molded article 10 interconnect with each other to let gas flow therethrough. Therefore, the above evacuation by suction creates a vacuum inside the first vacuum chamber 30, i.e., the inside and the outside of the molded article 10 similarly to the inside of the second vacuum chamber 40.
  • a pressure (degree of vacuum) of the inside of the first vacuum chamber 30 is preferably 40 kPa or lower, particularly 1 to 1300 Pa as a general range.
  • the evacuation by suction of the second vacuum chamber 40 is stopped. Further, the vacuum in the second vacuum chamber 40 is broken and, at the same time, pressure is applied into the second vacuum chamber 40 to a predetermined pressure.
  • These operations can be performed instantaneously by switching a three-way valve, etc. Because the first vacuum chamber 30 is in the evacuated state, the plastic film 50 which has been in intimate contact with the inner wall of the second vacuum chamber 40 is instantaneously drawn and stretched toward the inside of the first vacuum chamber 30, i.e., the inside of the molded article 10 in the present embodiment, whereby the inner surface of the molded article 10 is laminated with the plastic film 50 with intimate adhesion as shown in Fig. 13(c) .
  • the plastic film 50 is stretched in the direction opposite to the direction of preliminary stretching. Having been heated to a predetermined temperature by the heating means 43 until the vacuum of the second vacuum chamber 40 is broken, the plastic film 50 can be stretched and intimately adhered to the molded article 10 extremely smoothly, whereby the plastic film 50 can effectively be prevented from tearing or the like on stretching.
  • Pressure application into the second vacuum chamber 40 is carried out with a prescribed pressurizing fluid, conveniently air.
  • the pressure to be applied is preferably 100 to 3000 Pa, particularly 200 to 1000 Pa.
  • the plastic film 50 on the molded article 10 is conducted with the molded article 10 being heated to a predetermined temperature, the plastic film 50 can be superposed on the molded article 10 with further improved adhesion while being prevented from tearing more effectively. This is because satisfactory stretchability of the plastic film 50 is maintained during the superposing.
  • the molded article 10 can be heated by, for example, a prescribed heating means provided on the inner side of the side wall of the first vacuum chamber 30.
  • a preferred heating temperature of the molded article 10 is from 40 to 150°C for preventing re-shrinkage of the plastic film 50 and securing the production efficiency.
  • the evacuation by suction of the inside of the first vacuum chamber 30 is stopped, and the inner pressure of the first vacuum chamber 30 is increased to atmospheric pressure.
  • the second vacuum chamber 40 is then removed, and the molded article 10 laminated with the plastic film 50 is taken out of the first vacuum chamber 30.
  • the unsuperposed plastic film 50 remains around the opening portion of the molded article 10, which is trimmed to give the molded article 10 shown in Fig. 13(d) which has the inner surface thereof and the upper edge of its opening portion covered and laminated with the plastic film 50 with intimate adhesion.
  • the plastic film 50 can be superposed on the molded article 10 with good adhesion without tearing even if it is stretched at a stretch ratio as high as 4 to 10, where the stretch ratio of the plastic film 50 is defined as a ratio of the surface area of the plastic film 50 superposed on the molded article 10 and the opening area of the opening 31 of the first vacuum chamber 30 (the former/the latter).
  • the above method of production has a merit that the molded article 10 can be laminated with a film irrespective of whether or not it has air permeability. Further, because it is not necessary to evacuate through the wall of the molded article 10, the time required for evacuation by suction and emission can greatly be shortened as compared with conventional vacuum forming and the like to thereby markedly improve the productivity. Furthermore, the molded article 10 does not suffer from deformation by evacuation, it is not necessary to use a reinforcing mold as in conventional vacuum forming and the like, which leads to production cost reduction.
  • the plastic film it is preferred to use a stretchable film as the plastic film.
  • the plastic film it is preferred for the plastic film to have a thickness of about 5 to 200 ⁇ m, particularly about 20 to 100 ⁇ m, after laminating so as to impart desired characteristics such as water resistance and gas barrier properties to the molded article 10.
  • the thickness before laminating while varying depending on the thickness after laminating, the stretch ratio, etc., preferably ranges from about 50 to 1000 ⁇ m, particularly about 100 to 500 ⁇ m, from the viewpoint of handling properties during the production and the plastic film heating efficiency.
  • the molded article 10 is placed upside down (the opening portion 11 of the molded article 10 facing downward) in the first vacuum chamber 30, whereby the outer surface of the molded article 10 can be laminated with the plastic film 50. It is possible to laminate both the inner surface and the outer surface (except the bottom surface) of the molded article 10 with a single plastic film at the same time by making the opening 31 of the first vacuum chamber 30 extremely larger than the outer contour of the opening portion 11 of the molded article 10 to provide a wide gap between the opening 31 of the first vacuum chamber 30 and the opening portion 11 of the molded article 10. In this case, another film can be set between the bottom surface of the molded article 10 and the inner wall of the bottom of the first vacuum chamber 30 so that the inner and the outer surfaces, including the bottom surface, of the molded article 10 may be laminated with the two films simultaneously.
  • the plastic film When the molded article having the inner and/or the outer surfaces thereof laminated with the plastic film by any of the above-described methods is left to stand at 60°C for 30 minutes, the plastic film preferably has a shrinkage percentage of 30% or less, particularly 10% or less.
  • the shrinkage percentage is obtained from the distance between two arbitrary points on the plastic film-laminated surface of a molded article measured before and after the storage under the above-described conditions according to formula: (1 - distance before storage/distance after storage) x 100.
  • the shrinkage percentage can be made 30% or less by, for example, heating the plastic film-laminated molded article to the glass transition point of the plastic film or a higher temperature, followed by gradual cooling. Where the plastic film is a laminate comprising two or more plastic materials, the heating is at or above the glass transition point of the plastic material having the lowest glass transition point.
  • plastic layer on the outer and/or the inner surfaces of a molded article, which comprises powder coating the outer and/or the inner surfaces of the molded article to form a plastic layer(s).
  • plastic layer tends to form micropores while the solvent or the like evaporates, resulting in a fear of failure to manifest sufficient gas barrier properties (shielding against water or oxygen). There is also a fear that the solvent, etc. may deform the molded article. Contrarily, a plastic layer formed by powder coating is free from these disadvantages, providing a molded article with sufficient gas barrier properties.
  • Powder which can be used for powder coating includes powder of olefin resins, polyester resins, epoxy resins, acrylic resins, etc.
  • the powder can consist solely of the resin or, if necessary, it can be colored by addition of various pigments.
  • conventional additives known to be useful in paint compositions can be used with no particular restriction.
  • Such additives include leveling agents, e.g., acrylate polymers and silicone resins, and pinhole preventing agents, e.g., benzoin. These additives are preferably added in an amount of about 0.1 to 5 parts by weight each per 100 parts by weight of the resin.
  • the total thickness of the plastic layer(s) (the total of the plastic layers formed on the outer and the inner surfaces of a molded article) is decided appropriately according to the use of the molded article, the wall thickness, the kind of the contents and the like, and is usually from 50 to 600 ⁇ m. From the standpoint of moisture permeability, productivity, and cost, a preferred total thickness is 100 to 400 ⁇ m.
  • Powder coating can be carried out with a coating gun, which has at the tip thereof a nozzle equipped with a corona electrode for forcibly charging the powder simultaneously with ejecting the powder paint.
  • the powder paint ejected and charged simultaneously is applied to the surface to be coated, i.e., the outer and/or the inner surfaces of the molded article by electrostatic force.
  • baking step in which the applied powder paint is melted and hardened to form a plastic layer.
  • a baking oven capable of heating to a prescribed temperature is used for baking. From the standpoint of productivity, smoothness of the coating film, and prevention of scorching of the pulp, the baking is carried out at a temperature of 70 to 230°C, particularly 140 to 200°C, for a period of 1 to 20 minutes, particularly 5 to 20 minutes.
  • the plastic layer preferably has a thickness of 5 to 300 ⁇ m, particularly 20 to 150 ⁇ m, and the ratio of the thickness of the plastic layer to the thickness of the molded article (the former/the latter) is preferably 1/2 to 1/100, particularly 1/5 to 1/50.
  • the thickness of the plastic layer is smaller than 5 ⁇ m the storage stability of the contents tends to be insufficient because of failure to produce sufficient waterproofness and moistureproofness. If the thickness exceeds 300 ⁇ m, the plastic layer needs time for drying, and the coating liquid tends to sag while applied, resulting in such defects as unevenness of thickness of the plastic layer.
  • the thickness of the plastic layer can be measured by microscopic observation of the section of the molded article.
  • the molded article according to this embodiment has a clear boundary between the pulp fiber constituting the molded article and the resin constituting the plastic layer unlike an article whose plastic layer is formed by coating a molded article made of pulp with a coating liquid in a conventional manner.
  • an aqueous solution of a polymer penetrates into an undried molded article so that the boundary between the pulp fiber and the polymer is indefinite, whereas the molded article of the present embodiment is less pervious to the resin to make the boundary definite.
  • the molded article can be made waterproof and moistureproof with a smaller amount of the resin than needed conventionally, and the pulp fiber can be disintegrated more easily when recycled.
  • the thickness of the molded article which is appropriately decided according to the use, etc. so that the above ratio may fall within the range of from 1/2 to 1/100, is preferably from the range of 100 to 3000 ⁇ m, still preferably 500 to 2000 ⁇ m.
  • the resin used in the coating composition for forming a plastic layer includes acrylic resins, styrene-acrylic resins, ethylene-vinyl acetate resins, styrene-butadiene rubber resins, polyvinyl alcohol resins, vinylidene chloride resins, waxes, fluorine resins, silicone resins, and copolymers and polyblends of these resins.
  • the molded article In order to control penetration of the coating liquid into the molded article, it is preferred for the molded article to have a void of 30 to 70%, particularly 40 to 60%.
  • the void is calculated from the following formula (1).
  • the density of a molded article is calculated from the weight and the thickness of a piece cut out of the molded article, and the density of the material constituting the molded article is calculated from the proportions and the density of pulp fiber and other components.
  • Void % 1 - density of molded article / density of material constituting molded article ⁇ 100
  • the molded article may be too impervious to the coating liquid, tending to have reduced adhesion to the plastic layer.
  • the coating composition is applied by spraying with a prescribed spraying means after the wet pulp deposited body 5 obtained in Fig. 5(d) is preliminarily dried to a prescribed water content, e.g., about 0.1 to 25% by weight.
  • a prescribed water content e.g., about 0.1 to 25% by weight.
  • the void of the molded article being within the above range, the coating composition hardly penetrates into the molded article. As a result, most of the coating composition remains on the surface of the molded article, succeeding in manifesting sufficient waterproofness and moistureproofness with a smaller amount of the coating composition than conventionally required. In addition, reduction in disintegrability of the pulp fiber in recycling is avoided.
  • Yet another embodiment for forming a plastic layer on the outer surface of the molded article 10 comprises covering the outer surface of the molded article 10 with a shrink film with or without prescribed letters, figures, symbols, etc. printed thereon.
  • the shrink film covers the entire outer surface of the molded article 10 so that penetration of water or oxygen from the outside into the inside can be prevented thereby to prevent reduction in paper strength of the molded article 10 and to prevent mold development in the contents. Further, reduction in quality of the contents due to penetration of water or oxygen can also be prevented. Furthermore, the strength of the molded article 10 is further enhanced, and the contents are effectively prevented from leaking.
  • the shrink film does not need to cover the entire outer surface of the molded article.
  • the mode shown in Fig. 14 is especially effective in the case of such contents as to generate gas on moisture absorption and the like.
  • the shrink film 51 covers not all the outer surface of the molded article 10 but the area of the outer surface of the molded article 10 up to the height of or above the upper level of contents 52 and below the top of the container (the space between the upper level of the contents 52 and the top of the container is called a head space).
  • the contents react due to moisture absorption, etc. to generate gas, and the gas is accumulated in the head space, the gas has its escape blocked if the outer surface of the molded article 10 around the head space is covered with the shrink film 51.
  • the wrapping mode of Fig. 14 also has a merit that the use of the shrink film can be reduced. It may be conceivable that water or oxygen can enter through the wall of the molded article 10 around the head space. Even if it happens, the contact of water or oxygen with the contents is indirect as mediated by the head space. The space of this indirect contact of water or oxygen is far slower than that of the direct contact of water or oxygen with the contents through the wall of the molded article 10 in view of material transfer. Accordingly only if the molded article 10 is wrapped up to the height of the contents, i.e., only if the direct contact through the wall of the molded article 10 is avoided, penetration of water or oxygen through the wall of the molded article 10 around the head space is not so problematical.
  • the shrink film 51 comprises a film of an olefin resin, a polyester resin, etc.
  • an olefin resin a polyester resin
  • PET polyethylene terephthalate
  • OPS oriented polystyrene
  • the above-described materials of shrink films comprise a uniaxially or biaxially stretched film having a single-layer or multilayer structure.
  • the thickness of the shrink film 51 which is appropriately selected according to the use of the molded article 10 covered with the shrink film 51, the wall thickness of the molded article 10, the kind of the contents, and the like, is usually 10 to 150 ⁇ m, particularly 30 to 70 ⁇ m.
  • the molded article 10 having the outer surface thereof covered with the shrink film has an oxygen permeability of 500 cm 3 /(m 2 ⁇ hr ⁇ atm) or less, particularly 100 cm 3 /(m 2 ⁇ hr ⁇ atm) or less. It prevents the inside thereof from getting into a peroxidized state thereby to prevent reduction or deterioration of the quality of the contents.
  • the oxygen permeability is measured according to the method specified in JIS K7126.
  • the molded article having the outer surface thereof covered with a shrink film is preferably produced by surrounding the molded article having a water content of 5 to 35% by weight by the shrink film and applying microwaves to shrink the shrink film into intimate contact with the molded article and, at the same time, to dry the molded article.
  • the entire outer surface of the molded article 10 is surrounded by the shrink film 51. It is preferred to use the molded article 10 produced by the method of Fig. 5(d) which has a prescribed water content.
  • the shrink film is prepared by making a sheet into a cylinder, and sealing one end of the cylinder in the form of an arch (generally called R sealing) followed by a cut of the other end. In this state, the gap between the outer surface of body and the bottom portions of the molded article 10 and the shrink film is not so wide, while the gap between the outer surface of the opening portion and the shrink film is relatively wide.
  • an overcover 54 having a lid part 53 having a hanging down-wall over its periphery is put over the opening portion of the molded article 10 and the upper part of the shrink film that surrounds the opening portion.
  • the whole lid part 53 including the down-wall is capable of generating heat on irradiation with microwaves.
  • the gap between the inner side of the down-wall and the shrink film is preferably as small as possible.
  • this method can achieve the two steps - shrinking of the shrink film 51 and final dry of the molded article 10 - in a single operation of microwaves application.
  • the lid part 53 of the overcover 54 On being irradiated with microwaves, particularly in the area around the opening portion of the molded article 10, not only the molded article 10 but the lid part 53 of the overcover 54 generates heat, with which the shrink film shrinks to reduce the gap between the shrink film and the outer surface of the opening portion.
  • the heat generated from the opening portion itself is added to the shrink film to accelerate the shrinkage of the shrink film.
  • shrinkage around the opening portion that is not easy due to the diameter difference from the other portions can be achieved very easily.
  • the shrink film after shrinkage has improved appearance.
  • shrinkage of the shrink film by the use of the overcover 54 is effective in case where the diameters of the molded article are different from its opening portion to the bottom portion. Where the opening portion has a smaller diameter than the body portion, it is particularly effective where the diameter of the opening portion is not more than 50% of that of the body portion.
  • the lid part 53 of the overcover 54 is capable of generating heat on microwaves application.
  • the lid part 53 is preferably made of water-containing wood, paper, sponge or nonwoven fabric, etc., taking into consideration ease in shaping in conformity with the outer contour of a molded article, good heat generation efficiency, satisfactory properties of covering a shrink film, and satisfactory operating properties.
  • the shape of the lid part 53 is not particularly limited as long as the shrink film around the opening portion of the molded article 10 can be surrounded thereby.
  • the wavelength of the microwaves applied is generally 300 MHz to 300 GHz. A wavelength providing the highest heat generation efficiency is selected appropriately.
  • the molded article 10 thus covered with the shrink film is then filled with the contents.
  • the molded article 10 which is preliminarily dried may be filled with the contents, followed by covering with the shrink film.
  • the molded article 10 according to the fifth embodiment shown in Fig. 16 has the whole or a part of the opening portion 11 formed of plastic. Since it is the opening portion that receives the highest load in use of the molded article 10, use of plastic as a material forming this portion improves the durability of the molded article.
  • the plastics to be used include those which can constitute the plastic layers in the fourth embodiment. Where a part of the opening portion is made of plastic, it is advantageous for improving the durability of the molded article to make a sealing part, such as a thread engaging part, an inner ring or a contact ring for a cap, and the like, of plastics.
  • the molded article according to the sixth embodiment has a multilayered structure comprising a first pulp layer, a second pulp layer different from the first pulp layer in composition, and a mixed layer located between the first pulp layer and the second pulp layer, the mixed layer having a continuous gradient in composition in which the composition changes from that of the first pulp layer to that of the second pulp layer.
  • the multilayered molded article according to this embodiment is preferably produced by; injecting under pressure a first pulp slurry into the cavity of a mold which comprises a set of splits for papermaking butted to each other to form a cavity in conformity to the outer contour of an article to be molded, each split having a plurality of interconnecting holes connecting the outside and the inside, dewatering the cavity to form a first pulp layer on the inner wall of the cavity while injecting under pressure a second pulp slurry different from the first pulp slurry in composition into the cavity, and further dewatering the cavity to form a mixed layer on the first pulp layer, the composition of the mixed layer continuously changing from that of the first pulp layer to that of a second pulp layer, and further form a second pulp layer on the mixed layer.
  • Fig. 17 is shown a part of the papermaking step out of the steps involved for producing the multilayered molded article according to the present embodiment, wherein (a) is the step of injecting a first pulp slurry, (b) is the step of dewatering the first pulp slurry and injecting a second pulp slurry, and (c) is the step of dewatering the second pulp slurry.
  • a set of splits of a mold are butted to each other to form a cavity 1 therein in conformity to the outer contour of an article to be molded, and a predetermined amount of a first pulp slurry I is injected through the upper opening of the mold into the cavity 1 under pressure.
  • the structures of the splits 3 and 4 are the same as the splits shown in Fig. 5 .
  • Pressure injection of the first pulp slurry I can be done by means of, e.g., a pump.
  • the injection pressure of the first pulp slurry I is preferably 0.01 to 5 MPa, still preferably 0.01 to 3 MPa.
  • the cavity 1 being pressurized, the water of the first pulp slurry is discharged out of the mold, while the pulp fibers are accumulated on the inner wall of the cavity 1 to form a first pulp layer 55 as an outermost layer on the inner wall of the cavity 1 as shown in Fig. 17(b) .
  • a second pulp slurry II different from the first pulp slurry I in composition is then injected into the cavity 1 through the upper opening of the mold under pressure.
  • the injection pressure of the second pulp slurry II can be about the same as that of the first pulp slurry I.
  • a mixed pulp layer (not shown), which comprises the components of the mixed slurry, on the first pulp layer 55. Since the ratio of the second pulp slurry to the first pulp slurry in the mixed slurry increases continuously with time, the composition of the mixed layer formed on the first pulp layer 55 continuously changes from first pulp slurry-rich to second pulp slurry-rich compositions.
  • the composition of the mixed slurry in the cavity 1 finally becomes equal to the composition of the second pulp slurry.
  • a second pulp layer 57 comprising the component of the second pulp slurry is formed on the mixed layer as an innermost layer.
  • the first and the second pulp slurries are not particularly limited in kind as long as they have different compositions.
  • the pressure injection of the second pulp slurry is ceased, and air is introduced into the cavity 1 under pressure for pressurizing and dewatering.
  • the resulting pulp deposited body is subjected to the same steps as in the method of producing the molded article of the first embodiment, which includes the above-described steps shown in Figs. 5(b) through (d) , to obtain a multilayered molded article.
  • the multilayered structure of the molded article according to the present embodiment is as shown in Fig. 18 .
  • the mixed layer 56 whose composition continuously changes from that of the first pulp layer to that of the second pulp layer.
  • the adhesion strength between the first pulp layer 55 and the second pulp layer 57 is increased, and separation of these layers is prevented effectively.
  • the existence of the mixed layer 56 between the first pulp layer 55 and the second pulp layer 57 can be confirmed by microscopic observation of the section of the molded article.
  • the thicknesses of the first pulp layer 55, the mixed layer 56 and the second pulp layer 57 are decided appropriately according to the use and the like of the molded article. Where, in particular, pulp fiber of low whiteness is used as an inner layer, it is preferred for the outermost layer (the first pulp layer 55 in this particular embodiment) to have a thickness of 5 to 50%, especially 10 to 50%, of the total thickness of the molded article so as to exhibit sufficient masking properties when seen from the outside. The thickness of each layer depends on the amounts and the concentrations of the first and second pulp slurries used in the production of the molded article.
  • the molded article of the present embodiment can have different functions served by the individual layers.
  • the first pulp layer 55 as the outermost layer can be made a colored layer by incorporating a colorant, such as a pigment or a dye, or colored Japanese paper or a colored synthetic fiber into the first pulp slurry.
  • a colorant such as a pigment or a dye, or colored Japanese paper or a colored synthetic fiber
  • incorporating the colorant only into the first pulp slurry is advantageous in that the color tone of that slurry can be adjusted with ease.
  • the amount of the colorant to be added is preferably 0.1 to 15% by weight based on the pulp fiber.
  • the resulting molded article has improved surface smoothness and suitability to printing or coating.
  • LLKP hard wood bleached pulp
  • Incorporating additives such as waterproofing agents, water repellents, water-vaporproofing agents, fixing agents, oilproofing agents, antifungal agents, antimicrobial agents, antistatic agents, and the like, into the first pulp slurry imparts the respective functions to the first pulp layer 55 as the outermost layer. Further, incorporating a particulate or fibrous thermoplastic synthetic resin to the first pulp slurry imparts abrasion resistance to the first pulp layer 55 to suppress fluffing and the like.
  • the degree of abrasion resistance is preferably 3H or more in terms of pencil hardness (JIS K 5400).
  • the pulp slurry to be used for forming the first pulp layer 55 as the outermost layer to contain pulp fibers having an average fiber length of 0.2 to 1.0 mm, particularly 0.25 to 0.9 mm, especially 0.3 to 0.8 mm, a Canadian Standard Freeness of 50 to 600 cc, particularly 100 to 500 cc, especially 200 to 400 cc, and such a frequency distribution of fiber length as comprises 50 to 95%, particularly 60 to 95%, especially 70 to 95%, based on the total fiber, of fibers whose length ranges from 0.4 mm to 1.4 mm (range A).
  • Using such a pulp slurry brings about improved transfer of the inner configuration of the cavity.
  • the pulp slurry to be used for forming the second pulp layer 57 as the innermost layer to contain pulp fibers having an average length of 0.8 to 2.0 mm, particularly 0.9 to 1.8 mm, especially 1.0 to 1.5 mm, a Canadian Standard Freeness of 100 to 600 cc, particularly 200 to 500 cc, especially 300 to 400 cc, and such a frequency distribution of fiber length as comprises 20 to 90%, particularly 30 to 80%, especially 35 to 65%, based on the total fiber, of fibers whose length ranges from 0.4 mm to 1.4 mm (range A) and 5 to 50%, particularly 7.5 to 40%, especially 10 to 35%, based on the total fiber, of fibers whose length is more than 1.4 mm and not more than 3.0 mm (range B) as shown in Fig.
  • the frequency distribution curve has a peak in each of ranges A and B.
  • the thickness of the innermost layer is preferably 30 to 95%, still preferably 50 to 90%, of the total thickness.
  • a pulp molded article having more layers than the layer structure shown in Fig. 18 .
  • a third pulp layer 59 different in composition from both the second pulp layer 57 and the first pulp layer 55 is formed on the side of the second pulp layer 57 shown in Fig. 18 , and a mixed layer 58 whose composition continuously changes from the composition of the second pulp layer 57 to that of the third pulp layer 59 is formed between the second pulp layer 57 and the third pulp layer 59, making five layers in all.
  • a multilayered molded article made up of a plurality of materials is obtained.
  • another first pulp layer 55' is formed on the side of the second pulp layer 57 shown in Fig.
  • the present invention is not limited to the above-described embodiments so that the steps, apparatus, members and the like in each of the above-described embodiments are interchangeable with each other.
  • the molds that can be used in the present invention may be composed of a set of two or three or more papermaking splits in accordance with the shape of articles to be molded. The same applies to the heating molds.
  • Bottles shown in Fig. 1 were molded by the method shown in Fig. 5 .
  • the particulars of the pulp in the slurry used are shown in Table 2 below Molding properties in the molding are also shown in the Table.
  • "used paper B" used in Examples 2 to 4 is used paper used in OA equipment which comprises LBKP and has a small freeness
  • the LBKP used in Example 5 is CENIBRA (trade name), which has a large freeness.
  • the resulting molded articles had no seams in their body portion and smooth outer and inner surfaces.
  • the molded articles of Examples 1 to 5 prepared from a slurry containing pulp having a specific average fiber length, a specific freeness, and a specific fiber length frequency distribution show satisfactory molding properties. While not shown in the Table, the molded articles of Examples 2, 3 and 5 made of a blend comprising long pulp fibers and short pulp fibers and containing a large proportion of pulp fibers in range A had particularly excellent surface smoothness.
  • a molded article shown in Fig. 10 was obtained by the method shown in Fig. 5 .
  • the molded article had an Ra of 3 ⁇ m and an Rmax of 30 ⁇ m.
  • the corners linking each side wall and the corners linking each side wall and the bottom had a radius of curvature of 10 mm. There was no seams in the body portion, and the outer and the inner surfaces were smooth.
  • the molded article was set in the vacuum chamber shown in Fig. 13 and laminated with a plastic film by the aforementioned method. Laminating was performed with sufficient adhesion.
  • the plastic film was heated to 100°C in a non-contact state.
  • the thickness of the plastic film as laminated was about 40 ⁇ m.
  • the plastic film-laminated molded article was heated up to 120°C while applying pressure and gradually cooled to a room temperature. After allowing the thus treated molded article to stand at 60°C for 30 minutes, the shrinkage percentage of the plastic film in the lateral direction was measured, which was found to be 3.2%.
  • a slurry for outermost layer containing 1.0% by weight of pulp fiber whose physical properties are shown in Table 3 was injected into the cavity of the mold shown in Fig. 17 through the pulp slurry inlet gate under a pressure of 0.3 MPa.
  • the cavity was dewatered to form an outermost layer of the slurry for outermost layer on the inner wall of the cavity.
  • a slurry for innermost layer containing 1.0% of pulp fiber whose physical properties are shown in Table 3 was injected into the cavity under a pressure of 0.3 MPa.
  • Air was introduced into the cavity through the pulp slurry inlet gate under a pressure of 0.1 MPa to form, on the outermost layer, a mixed layer whose composition continuously changed from that of the slurry for outermost layer to that of the slurry for innermost layer and, on the mixed layer, an innermost layer was further formed of the slurry for innermost layer.
  • a pressing member comprising an elastic member was inserted into the thus obtained pulp deposited body, and air was fed into the pressing member under a pressure of 1.5 MPa to press the pulp deposited body onto the inner wall of the cavity for dewatering.
  • the mold was opened to take out the pulp deposited body, which was then set in a heating mold having the same cavity configuration as the shaping mold.
  • a pressing member comprising an elastic member was inserted into the pulp deposited body set in the heating mold. Air was introduced into the pressing member under a pressure of 1.5 MPa to press the pulp deposited body onto the inner wall of the cavity while heating the heating mold at 200°C to dry the pulp deposited body. After the pulp deposited body dried sufficiently, the heating mold was opened to take out the molded bottle.
  • the molding properties of the resulting molded article are shown in Table 3.
  • the surface roughness of the molded article was measured with Surfcom 120A available from Tokyo Seimitsu K.K.
  • the transfer properties of the inner cavity configuration to the molded article were evaluated with the naked eye.
  • a 20 mm wide by 70 mm long piece was cut out of the resulting molded article.
  • the cut piece was partly separated along the mixed layer to prepare a Y-shaped specimen.
  • the specimen was set on a tensile tester with a chuck distance of 20 mm and peeled at an angle of 180° and a pulling speed of 30 mm/min.
  • the results of the peel test are shown in Table 3.
  • a bottle was molded in the same manner as in Example 9, except that the slurry for outermost layer was injected into the cavity to complete formation of the outermost layer, and then the slurry for innermost layer was injected into the cavity to form an innermost layer on the outermost layer.
  • the resulting molded article had no mixed layer between the outermost layer and the innermost layer.
  • the same measurements as described above were made on the resulting molded article. The results obtained are shown in Table 3. TABLE 3 Ex. No. Pulp Fiber of Slurry for Innermost Layer Pulp Fiber of Slurry for Outermost Layer Thickness ( ⁇ m) Evaluation Avg. Fiber Length (mm) Freeness (cc) Fiber Length Frequency Distribution (%) Avg.
  • the molded articles of Examples in which the innermost and the outermost layers are formed by using slurries containing pulp fiber having specific physical properties, are prevented from developing cracks or unevenness of thickness (development of a part whose thickness is half or less the average thickness or a part with such a reduced thickness as can be perceived by the eye when held up to the light) and have excellent surface smoothness.
  • the molded articles of Examples each had no seams on their body portion, and their outer and inner sides had a smooth surface.
  • the molded articles of Examples 7 to 10 which had a mixed layer between the innermost layer and the outermost layer had an increased peel strength between the innermost layer and the outermost layer as compared with the molded article of Example 11.
  • the present invention provides a pulp molded article having high strength, excellent productivity, and excellent appearance.
  • the molded article can be produced at a low cost. Besides, it can be recycled or incinerated after use, which leads to reduction of waste.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Food Science & Technology (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Claims (12)

  1. Formartikel (10), der Zellstoff aufweist und einen Öffnungsabschnitt (11), einen Körperabschnitt (12) und einen Bodenabschnitt (13) hat, wobei der Körperabschnitt (12) keine Nähte hat, die Außen- (14) und Innenfläche (15) des Artikels glatt sind und der Körperabschnitt (12) mindestens einen Querschnittdurchmesser hat, der größer als ein entsprechender Querschnittdurchmesser des Öffnungsabschnitts (11) ist, wobei der entsprechende Querschnittdurchmesser des Öffnungsabschnitts (11) in der senkrechten Ebene liegt, die den Querschnittdurchmesser des Körperabschnitts (12) enthält, wobei der Formartikel (10) eine glatte Außen- (14) und Innenfläche (15) hat, so daß das Oberflächenprofil der Außen- und Innenfläche so ist, daß die arithmetische Mittenrauhtiefe (Ra) höchstens 50 µm beträgt und die maximale Höhe (Rmax) höchstens 500 µm beträgt.
  2. Formartikel (10) nach Anspruch 1, wobei alle Querschnittdurchmesser des Körperabschnitts (12) größer als entsprechende Querschnittdurchmesser des Öffnungsabschnitts (11) sind, wobei jeder der entsprechenden Querschnittdurchmesser des Öffnungsabschnitts (11) in der senkrechten Ebene liegt, die jeden der Querschnittdurchmesser des Körperabschnitts (12) enthält.
  3. Formartikel (10) nach Anspruch 1, wobei der Artikel über den Abschnitt vom Körperabschnitt (12) zum Bodenabschnitt (13) keine Nähte hat.
  4. Formartikel (10) nach Anspruch 1, wobei der Artikel ein Schraubgewinde auf dem Öffnungsabschnitt (11) hat.
  5. Formartikel (10) nach Anspruch 1, wobei der Artikel eine Dichte von 0,4 bis 2,0 g/cm3 hat.
  6. Formartikel (10) nach Anspruch 1, wobei der Artikel eine Feuchtedurchlässigkeit von höchstens 100 g/ (m2 · 24 h) hat.
  7. Formartikel (10) nach Anspruch 1, wobei der Artikel eine Dicke von mindestens 0,1 mm und eine Ecke hat, deren Dicke größer als die Dicke anderer Abschnitte des Artikels ist.
  8. Formartikel (10) nach Anspruch 1, wobei der Öffnungsabschnitt (11) einen dickwandigen Abschnitt (17) hat, der dicker als der Körperabschnitt (12) und der Bodenabschnitt (13) ist, wobei der dickwandige Abschnitt (17) auf dem Bereich von der Oberkante des Öffnungsabschnitts (11) auf eine vorgeschriebene Tiefe über den gesamten Umfang des Öffnungsabschnitts (11) kontinuierlich oder diskontinuierlich gebildet ist.
  9. Formartikel (10) nach Anspruch 1, wobei der Artikel ferner eine Kunststoffschicht auf seiner Außen- (14) und/oder Innenfläche (15) hat.
  10. Formartikel (10) nach Anspruch 1, wobei der Artikel einen Mehrschichtaufbau mit einer ersten Zellstoffschicht, einer sich von der ersten Zellstoffschicht in der Zusammensetzung unterscheidenden zweiten Zellstoffschicht und einer zwischen der ersten Zellstoffschicht und der zweiten Zellstoffschicht liegenden Mischschicht hat und die Mischschicht einen kontinuierlichen Gradienten der Zusammensetzung hat, in der sich die Zusammensetzung von der ersten Zellstoffschicht zur zweiten Zellstoffschicht ändert.
  11. Formartikel (10) nach Anspruch 1, wobei der Artikel als Papierrohstoff aus einem Brei hergestellt ist, der Zellstoffasern mit einer mittleren Faserlänge von 0,8 bis 2,0 mm, einem Kanadischen Norm-Mahlgrad (Canadian Standard Freeness) von 100 bis 600 cm3 und einer solchen Häufigkeitsverteilung der Faserlänge enthält, die aufweist: bezogen auf die gesamten Fasern 20 bis 90 % Fasern, deren Länge im Bereich von 0,4 mm bis 1,4 mm liegt, und bezogen auf die gesamten Fasern 5 bis 50 % Fasern, deren Länge größer als 1,4 mm und nicht größer als 3,0 mm ist.
  12. Formartikel (10) nach Anspruch 1, wobei die Oberkante (16) des Öffnungsabschnitts (11) eine arithmetische Mittenrauhtiefe (Ra) von höchstens etwa 50 µm und eine maximale Höhe (Rmax) von höchstens etwa 500 µm hat.
EP99918322A 1998-05-07 1999-05-06 Formkörper Expired - Lifetime EP1126083B1 (de)

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
JP12501398 1998-05-07
JP12501398 1998-05-07
JP37371798 1998-12-28
JP37371798A JP3118708B2 (ja) 1998-12-28 1998-12-28 パルプモールド中空成形体
JP37371698 1998-12-28
JP37371598 1998-12-28
JP37371598A JP3118707B2 (ja) 1998-05-07 1998-12-28 中空容器
JP37371698 1998-12-28
JP2929099 1999-02-05
JP2929099 1999-02-05
PCT/JP1999/002366 WO1999057373A1 (en) 1998-05-07 1999-05-06 Formed body

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EP1126083A4 EP1126083A4 (de) 2005-12-21
EP1126083B1 true EP1126083B1 (de) 2010-03-10

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WO (1) WO1999057373A1 (de)

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WO2013192260A1 (en) * 2012-06-19 2013-12-27 Pepsico, Inc. Method for making molded fiber bottles
US10486891B2 (en) 2016-12-02 2019-11-26 S.C. Johnson & Son, Inc. Plastic bottle for a pressurized dispensing system
WO2025040388A1 (de) * 2023-08-24 2025-02-27 Krones Ag Ummantelung für zumindest einen teilbereich eines fasern umfassenden behälters, fasern umfassender behälter umfassend mindestens eine ummantelung und verfahren zum anordnen mindestens einer ummantelung an einem fasern umfassenden behälter
WO2025040543A1 (de) * 2023-08-24 2025-02-27 Krones Ag Etikett für einen behälter aus faserstoff
WO2025114334A1 (en) * 2023-11-30 2025-06-05 L'oreal Cosmetic product packaging assembly comprising a bottle at least partly made of cellulose-based material and a closing member
WO2025114333A1 (en) * 2023-11-30 2025-06-05 L'oreal Cosmetic product packaging assembly comprising a bottle at least partly made of cellulose-based material and a closing member
FR3156014A1 (fr) * 2023-11-30 2025-06-06 L'oreal Ensemble de conditionnement de produit cosmétique comprenant un flacon au moins en partie réalisé en matériau cellulosique et un organe d’obturation

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US7249725B2 (en) 2002-11-22 2007-07-31 Sultex Ag Thread carrying apparatus and a textile machine, in particular a weaving machine, including a thread carrying apparatus for this kind
SE529897C2 (sv) 2006-03-27 2007-12-27 Rottneros Ab Formpressat tråg
WO2010144340A1 (en) * 2009-06-11 2010-12-16 Ellery West Paper container having a reinforced neck
US20160145811A1 (en) * 2014-11-20 2016-05-26 Pepsico, Inc. Method For Making Molded Fiber Bottles
DE102017214472A1 (de) * 2017-08-18 2019-02-21 Sig Technology Ag Ein Behälter mit einer ungefalteten Behälterschicht, beinhaltend eine Vielzahl von Partikeln, und einer Polymerschicht
DE102017214473A1 (de) * 2017-08-18 2019-02-21 Sig Technology Ag Ein Verfahren zum Herstellen eines Behälters aus einer Zusammensetzung, beinhaltend eine Flüssigkeit und eine Vielzahl von Partikeln, insbesondere unter Einhaltung einer maximalen Geschwindigkeit der Zusammensetzung
DE102017214471A1 (de) * 2017-08-18 2019-02-21 Sig Technology Ag Ein Verfahren zum Herstellen eines Behälters aus einer Zusammensetzung, beinhaltend eine Flüssigkeit und eine Vielzahl von Partikeln
DE102017214469A1 (de) 2017-08-18 2019-02-21 Sig Technology Ag Ein Verfahren zum Herstellen eines Behälters aus einem Behälterrohling, insbesondere mit einem Verringern einer Höhe des Behälterrohlings
EP4269691A4 (de) * 2020-12-25 2025-06-25 Toppan Inc. Zellstoffgeformter artikel und verfahren zur herstellung davon
CH718745A1 (de) * 2021-06-16 2022-12-30 Alpla Werke Alwin Lehner Gmbh & Co Kg Faserbasierter Behälter.
EP4370436A1 (de) * 2021-07-16 2024-05-22 Huhtamaki Molded Fiber Technology B.V. Faserformbehälter für milchprodukte, verfahren zur herstellung solch eines behälters und verwendung davon
TW202329858A (zh) * 2021-09-30 2023-08-01 瑞士商雀巢製品股份有限公司 飲料或食物製備系統
CH719750A1 (de) * 2022-06-03 2023-12-15 Alpla Werke Alwin Lehner Gmbh & Co Kg Verfahren und Vorrichtung zur Reduktion des Wassergehaltes in einem faserbasierten Rohling.
GB2620390B (en) * 2022-07-04 2025-02-05 Pulpex Ltd Method and system for forming a receptacle
CH720000A9 (de) * 2022-08-30 2024-05-15 Alpla Werke Alwin Lehner Gmbh & Co Kg Verfahren zum Beschichten eines getrockneten Rohlings.
EP4702188A1 (de) * 2023-04-24 2026-03-04 PAPACKS SALES GmbH Biologisch abbaubare dreidimensionale produkte aus naturfasern
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
WO2013192260A1 (en) * 2012-06-19 2013-12-27 Pepsico, Inc. Method for making molded fiber bottles
US10486891B2 (en) 2016-12-02 2019-11-26 S.C. Johnson & Son, Inc. Plastic bottle for a pressurized dispensing system
WO2025040388A1 (de) * 2023-08-24 2025-02-27 Krones Ag Ummantelung für zumindest einen teilbereich eines fasern umfassenden behälters, fasern umfassender behälter umfassend mindestens eine ummantelung und verfahren zum anordnen mindestens einer ummantelung an einem fasern umfassenden behälter
WO2025040543A1 (de) * 2023-08-24 2025-02-27 Krones Ag Etikett für einen behälter aus faserstoff
WO2025114334A1 (en) * 2023-11-30 2025-06-05 L'oreal Cosmetic product packaging assembly comprising a bottle at least partly made of cellulose-based material and a closing member
WO2025114333A1 (en) * 2023-11-30 2025-06-05 L'oreal Cosmetic product packaging assembly comprising a bottle at least partly made of cellulose-based material and a closing member
FR3156014A1 (fr) * 2023-11-30 2025-06-06 L'oreal Ensemble de conditionnement de produit cosmétique comprenant un flacon au moins en partie réalisé en matériau cellulosique et un organe d’obturation
FR3156015A1 (fr) * 2023-11-30 2025-06-06 L'oreal Ensemble de conditionnement de produit cosmétique comprenant un flacon au moins en partie réalisé en matériau cellulosique et un organe d’obturation
FR3156013A1 (fr) * 2023-11-30 2025-06-06 L'oreal Ensemble de conditionnement de produit cosmétique comprenant un flacon au moins en partie réalisé en matériau cellulosique et un organe d’obturation

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EP1126083A1 (de) 2001-08-22
DE69942126D1 (de) 2010-04-22
EP1126083A4 (de) 2005-12-21
WO1999057373A1 (en) 1999-11-11

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