JP2017013382A - Composite container manufacturing method, composite preform, and composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a composite container, a composite preform and a composite container capable of producing a composite container to which various functions and characteristics such as gas barrier properties are imparted with high quality. SOLUTION: A preform 10a made of a plastic material is prepared while having a mouth portion 11a, a body portion 20a, and a bottom portion 30a, and a plastic member 40a is provided on the outside of the preform 10a. By performing blow molding on the preform 10a and the plastic member 40a using the blow molding die 50, the preform 10a and the plastic member 40a are integrally expanded to form the container body 10 and the plastic member 40. A composite container 10A having is prepared. The lateral stretching ratio of the preform 10a with respect to the container body 10 was set to 3.5 times or less. [Selection diagram] Fig. 5

Description

  The present invention relates to a method for manufacturing a composite container, a composite preform, and a composite container.

  Recently, plastic bottles for storing content liquids such as foods and drinks have become common, and such plastic bottles store content liquids.

  A plastic bottle containing such a content liquid is manufactured by inserting a preform into a mold and biaxially stretch-blow molding.

  By the way, in the conventional biaxial stretch blow molding method, for example, a preform including a single layer material such as PET or PP, a multilayer material, a blend material, or the like is used to form a container shape. However, in the conventional biaxial stretch blow molding method, the preform is generally simply formed into a container shape. For this reason, when various functions and characteristics (barrier property, heat retaining property, etc.) are given to the container, the means is limited, for example, by changing the material constituting the preform.

JP 2009-241526 A

  The present invention has been made in consideration of such points, and a composite container manufacturing method, composite capable of producing a composite container having various functions and characteristics such as gas barrier properties with high quality. An object is to provide a preform and a composite container.

  The present invention provides a method of manufacturing a composite container, the step of preparing a preform made of a plastic material while having a mouth portion, a body portion, and a bottom portion, and the step of providing a plastic member outside the preform, The preform and the plastic member are blow-molded using a blow molding die to inflate the preform and the plastic member integrally, and a container body corresponding to the preform; And a step of producing a composite container having a plastic member provided in close contact with the outside of the container body, and in the step of producing the composite container, the transverse stretch ratio of the preform relative to the container body is set to It is the manufacturing method of the composite container characterized by being 3.5 times or less.

  This invention is a manufacturing method of the composite container characterized by the maximum thickness of the said trunk | drum of the said preform being 2 mm-10 mm.

  The present invention is the method of manufacturing a composite container, wherein the maximum thickness of the plastic member before blow molding is 0.1 mm to 2 mm.

  The present invention is a composite preform used in the method for manufacturing the composite container.

  The present invention is the composite preform characterized in that the maximum thickness of the body portion of the preform is 2 mm to 10 mm.

  The present invention is the composite preform, wherein the plastic member has a maximum thickness of 0.1 mm to 2 mm.

  The present invention is a composite container, wherein the composite container is manufactured by the method for manufacturing a composite container.

  According to the present invention, when a composite container is produced, it is possible to prevent a problem that a plastic member is broken, so that a composite container having various functions and characteristics such as gas barrier properties can be obtained with high quality. Can be produced.

FIG. 1 is a partial vertical sectional view showing a composite container according to a first embodiment of the present invention. FIG. 2 is a horizontal sectional view showing the composite container according to the first embodiment of the present invention (sectional view taken along the line II-II in FIG. 1). FIG. 3 is a partial vertical sectional view showing the composite preform according to the first embodiment of the present invention. 4A to 4D are perspective views showing various plastic members. FIGS. 5A to 5F are schematic views showing a method of manufacturing the composite container according to the first embodiment of the present invention. FIGS. 6A to 6F are schematic views showing a method for manufacturing a composite container according to a modification of the first embodiment of the present invention. FIGS. 7A to 7G are schematic views illustrating a method for manufacturing a composite container according to a modification of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a modification of the composite container according to the first embodiment of the present invention. FIG. 9 is a partial vertical sectional view showing a modification of the composite preform according to the first embodiment of the present invention. FIG. 10 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 11 is a horizontal cross-sectional view (cross-sectional view taken along the line XI-XI in FIG. 10) showing the composite container according to the second embodiment of the present invention. FIG. 12 is a partial vertical sectional view showing a composite preform according to the second embodiment of the present invention. FIGS. 13A to 13F are schematic views showing a method for manufacturing a composite container according to the second embodiment of the present invention. FIGS. 14A to 14F are schematic views showing a method for manufacturing a composite container according to a modification of the second embodiment of the present invention. FIGS. 15A to 15G are schematic views showing a method for manufacturing a composite container according to a modification of the second embodiment of the present invention. FIG. 16 is a partial vertical sectional view showing a modification of the composite container according to the second embodiment of the present invention. FIG. 17 is a partial vertical sectional view showing a modification of the composite preform according to the second embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 9 are views showing a first embodiment of the present invention.

  First, an outline of a composite container produced by the composite container manufacturing method (blow molding method) according to the present embodiment will be described with reference to FIGS. 1 and 2. In the present specification, “upper” and “lower” refer to the upper side and the lower side in a state where the composite container 10A is erected (FIG. 1), respectively.

  A composite container 10A shown in FIGS. 1 and 2 is biaxially stretched with respect to a composite preform 70 (see FIG. 3) including a preform 10a and a plastic member 40a using a blow molding die 50, as will be described later. By performing blow molding, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded.

  Such a composite container 10 </ b> A includes a container body 10 made of a plastic material located inside and a plastic member 40 provided in close contact with the outside of the container body 10.

  Among these, the container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a trunk portion 20 provided below the shoulder portion 12, And a bottom portion 30 provided below the portion 20.

  On the other hand, the plastic member 40 is in close contact with the outer surface of the container main body 10 in a thinly extended state, and is attached to the container main body 10 without being easily moved or rotated.

  Next, the container body 10 will be described in detail. As described above, the container body 10 includes the mouth portion 11, the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30.

  Of these, the mouth portion 11 includes a screw portion 14 screwed into a cap (not shown) and a flange portion 17 provided below the screw portion 14. The shape of the mouth portion 11 may be a conventionally known shape.

  The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape having a substantially uniform diameter. The shoulder 12 is located between the neck 13 and the trunk 20 and has a shape whose diameter gradually increases from the neck 13 toward the trunk 20.

  Furthermore, the trunk | drum 20 has a cylindrical shape with a substantially uniform diameter as a whole. However, the present invention is not limited to this, and the body portion 20 may have a polygonal cylindrical shape such as a rectangular cylindrical shape or an octagonal cylindrical shape. Or the trunk | drum 20 may have a cylinder shape with a horizontal cross section which is not uniform toward upper direction from the downward direction. Moreover, in this Embodiment, although the unevenness | corrugation is not formed in the trunk | drum 20, and has a substantially flat surface, it is not restricted to this. For example, unevenness such as a panel or a groove may be formed on the body portion 20.

  On the other hand, the bottom portion 30 has a concave portion 31 located in the center and a grounding portion 32 provided around the concave portion 31. The shape of the bottom 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape or a round bottom shape).

The thickness _{T 1} of the container body 10 in the barrel 20, but are not limited to, for example, the full delivery volume is not less than the large bottle 3L, refers to 300μm~500μm (300μm or 500μm or less. Hereinafter (Similarly), the weight of the container body 10 is not limited to this, but can be 75 g to 200 g. Thus, by reducing the thickness of the container main body 10, the weight of the container main body 10 can be reduced. In the case of a small bottle with a full capacity of less than 3 L, the thickness T ₁ of the container body 10 can be reduced to about 100 μm to 200 μm, and the weight of the container body 10 is not limited to this. Although not, it can be 10g-20g. Thus, by reducing the thickness of the container main body 10, the weight of the container main body 10 can be reduced.

  Such a container main body 10 can be manufactured by biaxially stretching blow-molding a preform 10a (described later) manufactured by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate) may be used. preferable. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but is preferably colorless and transparent in consideration of ease of recycling. Moreover, you may blend and use the various resin mentioned above. Further, a vapor deposition film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to enhance the barrier property of the container.

  The container body 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer has gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). You may form as a multilayer bottle which has gas barrier property and light-shielding property by extrusion-molding preform 10a which consists of three or more layers as resin which it has (intermediate layer), and carrying out blow molding. As the intermediate layer, a resin obtained by blending the above-described various resins may be used.

  Further, by mixing an inert gas (nitrogen gas, argon gas) with the thermoplastic resin melt, a foam preform having a foam cell diameter of 0.5 to 100 μm is formed, and this foam preform is blow-molded. Thus, the container body 10 may be manufactured. Since such a container main body 10 contains the foam cell, the light shielding property of the container main body 10 whole can be improved.

  In the case of such a large-sized bottle, the container body 10 is preferably a bottle having a full capacity of 3000 ml to 50000 ml, and more preferably a full capacity of 3000 ml to 20000 ml. In the case of a small bottle, it is preferable that the full capacity is 100 ml to 3000 ml, and more preferably the full capacity is 200 ml to 2000 ml.

In the case of a large bottle, the height H ₁ from the bottom of the flange portion 17 of the container body 10 to the grounding portion 32 is preferably 200 mm to 1000 mm, and the height H ₂ of the mouth portion 11 is, for example, 10 mm to It is preferable to set it as 100 mm. Further, the maximum width (the maximum diameter) _{D 1} of the body portion 20 of the container body 10 is preferably in the 75Mm～600mm. In the case of a small bottle, the height H ₁ from the bottom of the flange portion 17 of the container body 10 to the grounding portion 32 is preferably 50 mm to 200 mm, and the height H ₂ of the mouth portion 11 is, for example, 7 mm to 30 mm. It is preferable to do. Further, the maximum width (the maximum diameter) _{D 1} of the body portion 20 of the container body 10 is preferably in the 40Mm～100mm.

  Next, the plastic member 40 will be described. As will be described later, the plastic member 40 (40a) is provided so as to surround the outer side of the preform 10a. It is a thing. As will be described later, the plastic member 40 is produced by stretching a plastic member 40a together with the preform 10a.

  The plastic member 40 is attached to the outer surface of the container body 10 without being bonded, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly extended on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 2, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

  In this case, the plastic member 40 is provided so as to cover the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11 and the neck portion 13. Thereby, desired functions and characteristics can be imparted to the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10.

  The plastic member 40 may be provided in the entire region or a partial region other than the mouth portion 11 of the container body 10. For example, the plastic member 40 may be provided so as to cover the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of plastic members 40 is not limited to one, and a plurality of plastic members 40 may be provided. For example, you may provide the two plastic members 40 in the outer surface of the shoulder part 12, and the outer surface of the bottom part 30, respectively.

  On the other hand, since the plastic member 40 is not welded or bonded to the container body 10, it can be peeled off from the container body 10 and removed. Specifically, for example, the plastic member 40 may be cut using a blade or the like, or a cutting line (not shown) may be provided in advance on the plastic member 40, and the plastic member 40 may be peeled along the cutting line. it can. Thereby, the plastic member 40 can be separated and removed from the container body 10.

  Such a plastic member 40 may have no contracting action on the preform 10a, or may have a contracting action.

The thickness _{T 2} of the plastic member 40 is not limited to, it can be a state of being attached to the container body 10, for example 100μm~3000μm about.

  In the present embodiment, the plastic member 40 may be colored in a visible light color such as red, blue, yellow, green, brown, black, and white. The plastic member 40 may be (semi) transparent or opaque. In this case, for example, the plastic member 40 may be colored with visible light and the container body 10 may be colorless and transparent. Alternatively, both the container body 10 and the plastic member 40 may be colored in a visible light color. When producing the plastic member 40 colored in visible light color, a visible light color pigment may be added to the molding material in the step of producing the plastic member 40a before blow molding by injection molding or the like. .

  Next, the structure of the composite preform according to this embodiment will be described with reference to FIG.

  As shown in FIG. 3, the composite preform 70 includes a preform 10a made of a plastic material, and a bottomed cylindrical plastic member 40a provided outside the preform 10a.

  The preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11. Moreover, the trunk | drum 20a respond | corresponds to the neck part 13, the shoulder part 12, and the trunk | drum 20 of the container main body 10 mentioned above, and has a substantially cylindrical shape. The bottom 30a corresponds to the bottom 30 of the container body 10 described above, and has a substantially hemispherical shape.

In this embodiment, the case of a large bottle, the diameter _{d 1} of the body portion 20a is a 50 mm to 200 mm, it is preferable to 50 to 100 mm. For smaller bottles, diameter _{d 1} of the body portion 20a has a 25Mm～50mm, it is preferable to 25Mm～35mm. When the preform 10a is manufactured by injection molding, the body 20a may have a slightly smaller diameter on the bottom 30a side than the mouth 11a side in order to provide a draft angle that facilitates extraction from the mold. . In this case, the diameter d ₁ is defined by the diameter of the thickest portion of the body portion 20a. By the way, in the case of a large-sized bottle, the diameter of the trunk part of a conventionally common preform is about 50 mm to 100 mm. On the other hand, according to this embodiment, since the diameter d ₁ of the body portion 20a is thicker or more 100 mm, as will be described later, in a step of preparing a composite container 10A by blow molding, the preform for the container body 10 The transverse stretch ratio of 10a can be 3.5 times or less. In the case of a small bottle, the diameter of the body portion of a conventional preform is about 20 mm to 25 mm. On the other hand, according to this embodiment, since the diameter d ₁ of the body portion 20a is thicker or more 25 mm, as will be described later, in a step of preparing a composite container 10A by blow molding, the preform for the container body 10 The transverse stretch ratio of 10a can be 3.5 times or less. As a result, it is possible to prevent a problem that the plastic member 40a is too widened and broken.

In addition, in the case of a large bottle, the height h ₁ from the lower portion of the flange portion 17 of the preform 10a to the lowest point of the bottom portion 30a is preferably 200 mm to 1000 mm, and more preferably 200 mm to 600 mm. In the case of a small bottle, it is preferably 50 mm to 200 mm, and more preferably 100 mm to 200 mm. The height h ₁ By this range, it is possible to suppress the longitudinal stretching, it is easy to mold. The height _{h 2} of the mouth portion 11a of the preform 10a is substantially identical to the height _{H 2} of the mouth 11 of the container body 10 described above, for example, in the case of a large bottle, a 10 mm to 100 mm, small bottles In this case, it is 7 mm to 30 mm.

Furthermore, the maximum thickness _{t 1} of the preform 10a in the body portion 20a in the case of a large bottle, preferably to 4 mm to 10 mm, and more preferably be 6Mm～8mm. By the thickness t ₁ or more 4 mm, it is possible to facilitate the thickness adjustment of the container body 10. Further, by setting the thickness t ₁ to 10 mm or less, the thickness T ₁ of the container body 10 becomes too thick even when the transverse stretching ratio of the preform 10a with respect to the container body 10 is 3.5 times or less. Can be prevented. In the case of a small bottle, it is preferably 2 mm to 5 mm, and more preferably 3 mm to 4.5 mm. By the thickness t ₁ or more 3 mm, it is possible to facilitate the thickness adjustment of the container body 10. Further, by setting the thickness t ₁ to 5 mm or less, the thickness T ₁ of the container body 10 becomes too thick even when the transverse stretching ratio of the preform 10a with respect to the container body 10 is 3.5 times or less. Can be prevented.

  The plastic member 40a is attached to the outer surface of the preform 10a without being bonded, and is in close contact with the preform 10a so as not to move or rotate, or in close contact with the preform 10a so as not to fall by its own weight. . The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

The thickness _{t 2} of the plastic member 40a may be, for example 100μm~3000μm about. By setting the thickness t ₂ or more 100 mm, inconvenience of plastic member 40a will be broken stretched is prevented during blow molding. Further, by setting the thickness t ₂ less 3000 mm, the plastic member 40a is not stretched sufficiently defect is prevented at the time of blow molding.

  In this case, the plastic member 40a is provided so as to cover the entire region of the body portion 20a excluding the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a. Moreover, the plastic member 40a may be colored in visible light colors such as red, blue, yellow, green, brown, black, and white.

  The plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Furthermore, the number of plastic members 40a is not limited to one, and a plurality of plastic members 40a may be provided. For example, two plastic members 40a may be provided at two locations outside the trunk portion 20a.

  Such a plastic member 40a may be one that does not have a contracting action on the preform 10a or may have a contracting action.

  In the former case, the plastic member 40a is produced by, for example, a direct blow molded tube produced by a direct blow molding method, a sheet molded tube produced by a sheet molding method, an extruded tube produced by extrusion molding, or inflation molding. However, the present invention is not limited to this, and other molding methods may be used.

  In the latter case, that is, when the plastic member (outer contraction member) 40a has an action of contracting, the plastic member (outer contraction member) 40a is, for example, when an external action (for example, heat) is applied. What shrinks | contracts with respect to the reform 10a (for example, heat shrink) may be used. Alternatively, the plastic member (outer contraction member) 40a itself may be contractible or elastic and can contract without applying an external action.

  Examples of the plastic member 40a include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, Polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluoro rubber, nylon 6, nylon 6,6, nylon MXD6, aromatic poly , Polycarbonate, ethylene polyterephthalate, polybutylene terephthalate, poly ethylene naphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene Examples thereof include sulfide, polyethersulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin. Among these, it is preferable to use thermoplastic inelastic resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Moreover, those blend materials, multilayer structures, and partial multilayer structures may be used. Furthermore, various additives other than the main component resin may be added to the material of the plastic member 40a as long as the characteristics are not impaired. Examples of additives include plasticizers, UV stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, slip agents, mold release agents, An oxidizing agent, an ion exchange agent, a coloring pigment, and the like can be added. Also, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is molded. , The light shielding property can be improved.

  The plastic member 40a may be made of the same material as the container body 10 (preform 10a). In this case, in the composite container 10A, for example, the plastic member 40 can be intensively arranged at a portion where the strength is to be increased, and the strength of the portion can be selectively increased. For example, plastic members 40 may be provided around the shoulder 12 and the bottom 30 of the container body 10 to increase the strength of this portion. Examples of such materials include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate).

  The plastic member 40a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, the gas barrier property of the composite container 10A can be enhanced without using a multilayer preform or a preform containing a blend material as the preform 10a, and the content liquid can be prevented from being deteriorated by oxygen or water vapor. For example, a plastic member 40 may be provided in the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 of the container body 10, and the gas barrier property of this portion may be improved. Examples of such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), and oxygen such as fatty acid salts in these materials. It is also possible to mix an absorbent material.

  The plastic member 40a may be made of a material having a light barrier property such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved and the content liquid can be prevented from being deteriorated by ultraviolet rays or the like without using a multilayer preform or a preform containing a blend material as the preform 10a. For example, a plastic member 40a may be provided in the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 of the container body 10 to enhance the ultraviolet barrier property of this portion. As such a material, a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Moreover, you may use the foaming member with the foam cell diameter of 0.5-100 micrometers produced by mixing inert gas (nitrogen gas, argon gas) with the melt of a thermoplastic resin.

  In addition, the plastic member 40a may be made of a material having a higher cold-retaining property or higher heat-retaining property (a material having a lower thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the cold insulation property or heat retention property of composite container 10A is improved. For example, the plastic member 40 may be provided on the whole or a part of the body 20 in the container body 10 to enhance the cold insulation or heat insulation of the body 20. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too cold or too hot. Examples of such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. It is preferable to mix hollow particles with a resin material containing these resins. The average particle diameter of the hollow particles is preferably 1 to 200 μm, and more preferably 5 to 80 μm. The “average particle size” means the volume average particle size and is measured by a known method using a particle size distribution / particle size distribution measuring device (for example, Nanotrack particle size distribution measuring device, manufactured by Nikkiso Co., Ltd.). can do. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include styrene resins such as cross-linked styrene-acrylic resins, (meth) acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide resins, and polyimides. Resin, polycarbonate resin, polyether resin and the like. In addition, Ropeke HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra, Ropeke SE, Ropeke ST (made by Rohm and Haas Co.), Nipol MH-5055 (made by Nippon Zeon Co., Ltd.), SX8782 Commercially available hollow particles such as SX866 (manufactured by JSR Corporation) can also be used. As content of a hollow particle, it is preferable that it is 0.01-50 mass parts with respect to 100 mass parts of resin materials contained in the plastic members 40a, and it is more preferable that it is 1-20 mass parts.

  The plastic member 40a may be made of a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). In this case, the user can easily hold the composite container 10 </ b> A without changing the material of the container body 10. For example, a plastic member 40 may be provided on all or part of the body 20 of the container body 10 so that the body 20 can be easily held.

  The plastic member 40a may be preliminarily printed with design or printing. In this case, the printing may be formed by designing or printing the plain plastic member 40a by a printing method such as an inkjet method or a gravure printing method. This printing may be performed on the plastic member 40a before being attached to the preform 10a, or may be performed in a state where the plastic member 40a is provided outside the preform 10a. The plastic member 40a may be colored in colors such as red, blue, yellow, green, brown, black, and white, and may be transparent or opaque.

  Next, the shape of the plastic member 40a will be described.

  As shown in FIGS. 3 and 4A, the plastic member 40a has a bottomed cylindrical shape as a whole, and includes a cylindrical body 41 and a bottom 42 connected to the body 41. May be. In this case, since the bottom part 42 of the plastic member 40a covers the bottom part 30a of the preform 10a, in addition to the trunk part 20 of the composite container 10A, the bottom part 30 also has various barrier properties such as a barrier property against light having a wavelength of 400 nm to 500 nm. Functions and properties can be added. Examples of such a plastic member 40a include the above-described blow tube and sheet molded tube.

  Further, as shown in FIGS. 9 (described later) and FIG. 4B, the plastic member 40a has a circular tube shape (bottomless cylindrical shape) as a whole, and has a cylindrical body 41. good. In this case, as the plastic member 40a, for example, the above-described blow tube, extruded tube, inflation molded tube, or sheet molded tube can be used.

  Moreover, as shown in FIG.4 (c) and FIG.4 (d), the plastic members 40a may be produced by forming a film in a cylinder shape and bonding the edge part together. In this case, as shown in FIG. 4 (c), the plastic member 40a may be configured in a tubular shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 4 (d), The bottom 42 may be bonded to form a bottomed cylinder.

  Next, a manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS.

First, a preform 10a made of a plastic material is prepared (see FIG. 5A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an unillustrated injection molding machine. The preform 10a has a mouth portion 11a, a barrel portion 20a having a diameter _{d 1} is 25Mm～200mm, a bottom 30a of a substantially hemispherical shape.

  Next, the plastic member 40a is prepared. In this case, the plastic member 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.

  Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is manufactured (FIG. 5 ( b)).

  In this case, a plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a may be pressed into the preform 10a to be brought into close contact with the outer surface of the preform 10a. Alternatively, as will be described later, a heat-shrinkable plastic member 40a is provided on the outer surface of the preform 10a, and the plastic member 40a is thermally contracted by heating to 50 ° C. to 100 ° C. You may make it stick to.

  In this way, a series of steps for producing the composite preform 70 (FIGS. 5A to 5B) are performed by previously bringing the plastic member 40a into close contact with the outside of the preform 10a and producing the composite preform 70. )) And a series of steps (FIGS. 5 (c) to 5 (f)) for producing the composite container 10A by blow molding can be performed at different places (factories, etc.).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 5C). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 5D).

  The composite container 10 </ b> A is molded using this blow molding die 50. In this case, the blow mold 50 is composed of a pair of body molds 50a and 50b and a bottom mold 50c which are divided from each other (see FIG. 5D). In FIG. 5 (d), the pair of body molds 50a and 50b are open to each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b.

  Next, as shown in FIG. 5E, after the bottom mold 50c is lowered, the pair of body molds 50a, 50b is closed, and sealed by the pair of body molds 50a, 50b and the bottom mold 50c. A blow mold 50 is formed.

  Next, air is press-fitted into the preform 10 a and biaxial stretch blow molding is performed on the composite preform 70.

  As a result, the container body 10 is obtained from the preform 10 a in the blow molding die 50. During this time, the body molds 50a and 50b are heated to 30 ° C. to 80 ° C., and the bottom mold 50c is cooled to 5 ° C. to 25 ° C. At this time, in the blow mold 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as a unit. Thereby, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow mold 50.

  In this manner, a composite container 10A including the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

  In this blow molding, the transverse stretching ratio of the preform 10a with respect to the container body 10 is 3.5 times or less, preferably 3 times or less. As described above, by suppressing the transverse stretching ratio at the time of blow molding to 3.5 times or less, it is possible to prevent a problem that the plastic member 40a is stretched and broken. On the other hand, the longitudinal stretch ratio of the preform 10a with respect to the container body 10 is preferably 3 times or less.

  Next, as shown in FIG. 5 (f), the pair of body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the composite container 10 </ b> A is taken out from the blow molding mold 50.

Modified Example of Manufacturing Method of Composite Container Next, a modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 6 (a) to 6 (g) has a function in which a plastic member (outer contraction member) 40a contracts with respect to the preform 10a, and other configurations are shown in FIG. 5 (a). It is substantially the same as the form shown in (f). 6A to 6F, the same parts as those in FIGS. 5A to 5F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of a plastic material is prepared (see FIG. 6A).

  Next, a plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 6B). In this case, the plastic member (outer contraction member) 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body 41 and a bottom 42 connected to the body 41. This plastic member (outer contraction member) 40a is mounted so as to cover the entire region of the body portion 20a except the portion corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a.

  Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the heating device 51 (see FIG. 6C). At this time, the preform 10a and the plastic member (outer contraction member) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (outer contraction member) 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  In this way, the plastic member (outer contraction member) 40a is heated, so that the plastic member (outer contraction member) 40a is thermally contracted and is in close contact with the outside of the preform 10a (see FIG. 6C). . When the plastic member (outer contraction member) 40a itself has contractibility, the plastic member at the time when the plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 6B). (Outer contraction member) 40a may be in close contact with the outside of the preform 10a.

  Subsequently, the preform 10a and the plastic member (outer contraction member) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 6D). In this case, the heating for shrinking the plastic member (outer contraction member) 40a and the heating for blow-molding the preform 10a can be performed in the same process.

  The preform 10a and the plastic member (outer contraction member) 40a are molded by using this blow molding die 50, and are substantially the same as those in FIGS. 5 (a) to 5 (f) described above. A composite container 10A including a plastic member (outer contraction member) 40 provided on the outer surface of the container body 10 is obtained (see FIGS. 6D to 6F). At this time, the transverse stretching ratio of the preform 10a with respect to the container body 10 is 3.5 times or less, and the problem that the plastic member 40a is stretched and broken is prevented.

  Next, with reference to FIGS. 7A to 7G, another modification of the method for manufacturing the composite container 10A (blow molding method) according to the present embodiment will be described. 7 (a) to 7 (g) has an effect that the plastic member (outer contraction member) 40a contracts with respect to the preform 10a, and the preform 10a and the plastic member (outer contraction member) 40a. Is heated in two stages, and the other configuration is substantially the same as the configuration shown in FIGS. 7A to 7G, the same parts as those in FIGS. 5A to 5F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of a plastic material is prepared (see FIG. 7A).

  Next, a plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 7B).

  Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the first heating device 55 (see FIG. 7C). At this time, the heating temperature of the preform 10a and the plastic member (outer contraction member) 40a may be, for example, 50 ° C. to 100 ° C.

  By heating the plastic member (outer contraction member) 40a, the plastic member (outer contraction member) 40a is thermally contracted, and is in close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and a plastic member (outer contraction member) 40a in close contact with the outside of the preform 10a is obtained (see FIG. 7C).

  In this way, the composite preform 70 is manufactured by preliminarily bringing the plastic member (outer contraction member) 40a into heat contact with the outside of the preform 10a using the first heating device 55, thereby producing the composite preform 70. A series of steps (FIGS. 7 (a) to (c)) and a series of steps (FIGS. 7 (d) to (g)) for producing the composite container 10A by blow molding are performed at different locations (factories and the like). ) Can be implemented.

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 7D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (outer contraction member) 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 7E).

  The composite preform 70 is molded using the blow mold 50 and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the above-described FIGS. A composite container 10A provided with a plastic member (outer contraction member) 40 is obtained (see FIGS. 7E to 7G). At this time, the transverse stretching ratio of the preform 10a with respect to the container body 10 is 3.5 times or less, and the problem that the plastic member 40a is stretched and broken is prevented.

  As described above, according to the present embodiment, the preform 10a and the plastic member 40a of the composite preform 70 are integrated by performing blow molding on the composite preform 70 in the blow molding die 50. As a result, a composite container 10A including the container body 10 and the plastic member 40 is manufactured. Thereby, preform 10a (container main part 10) and plastic member 40a (plastic member 40) can be constituted from another member. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

  Moreover, according to this Embodiment, when producing composite container 10A by blow molding, the horizontal direction draw ratio of preform 10a with respect to container body 10 is set to 3.5 times or less. Thereby, the malfunction that the plastic member 40a is extended and broken at the time of blow molding is prevented. Thereby, 10 A of composite containers provided with various functions and characteristics, such as gas barrier property, can be produced with high quality.

  In particular, since it is not necessary to change the shape of the blow mold 50, the composite container 10A including the container body 10 and the plastic member 40 can be molded using the conventional blow mold as it is. .

  Furthermore, according to the present embodiment, when producing the composite container 10A, a general blow molding apparatus can be used as it is, so that it is necessary to prepare a new molding facility for producing the composite container 10A. Absent. Moreover, since the plastic member 40a is provided outside the preform 10a, it is not necessary to prepare a new molding facility for molding the preform 10a.

Modification of Composite Container and Composite Preform Next, a modification of the present embodiment will be described with reference to FIGS.

  The modification shown in FIGS. 8 and 9 does not have a body portion and a bottom portion as the plastic member 40a, but uses a cylindrical plastic member 40a.

  In the composite container 10 </ b> A shown in FIG. 8, the plastic member 40 extends from the shoulder 12 of the container body 10 to the lower part of the trunk 20, but does not reach the bottom 30. Further, in the composite preform 70 shown in FIG. 9, the plastic member 40a is in close contact so as to cover only the trunk portion 20a of the preform 10a, and more specifically, the neck portion 13 of the container body 10 in the trunk portion 20a. The region excluding the portion 13a corresponding to the portion and the portion corresponding to the lower portion of the body portion 20a is covered.

  8 and 9, other configurations are substantially the same as those of the embodiment shown in FIGS. In the modification shown in FIGS. 8 and 9, the same parts as those in the embodiment shown in FIGS. Further, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those in the embodiment shown in FIGS. 8 and 9, the plastic member 40 may have a function of contracting with respect to the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 10 to 17 are views showing a second embodiment of the present invention. 10 to 17, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, an outline of the composite container according to the present embodiment will be described with reference to FIGS. 10 and 11.

  A composite container 10A shown in FIGS. 10 and 11 is formed into a composite preform 70 (see FIG. 12) including a preform 10a, an inner label member 60a, and a plastic member 40a using a blow mold 50, as will be described later. On the other hand, by performing biaxial stretch blow molding, the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 are integrally expanded.

  Such a composite container 10 </ b> A is provided in close contact with the outer side of the inner label member 60 and the inner label member 60 provided in close contact with the outer side of the container main body 10. The plastic member 40 is provided.

  Among these, the inner label member 60 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is in close contact with the container body 10 so as not to easily move or rotate.

  The plastic member 40 is in close contact with the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and is in close contact with the container body 10 so as not to easily move or rotate. Yes.

  It is conceivable that at least a part of the plastic member 40 is translucent or transparent. In this case, the inner label member 60 can be visually recognized from the outside through the translucent or transparent portion. The plastic member 40 may be entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, a window portion).

  Next, the inner label member 60 will be described. As will be described later, the inner label member 60 (60a) is provided so as to surround the outer side of the preform 10a. Is.

  The inner label member 60 is attached to the outer surface of the container body 10 without being bonded, and is in close contact with the container body 10 so as not to move or rotate. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 11, the inner label member 60 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

  In this case, the inner label member 60 is provided so as to cover the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11 and the neck portion 13. Thereby, desired characters, images, and the like can be imparted to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container main body 10, and the composite container 10A can be decorated and information can be displayed.

  The inner label member 60 may be provided in the entire region or a partial region of the container body 10 other than the mouth portion 11 and the neck portion 13. For example, the inner label member 60 may be provided so as to cover the entire body part 20 and the bottom part 30 except for the mouth part 11, the neck part 13, and the shoulder part 12 in the container body 10. Furthermore, the inner label member 60 is not limited to one, and a plurality of inner label members 60 may be provided. The inner label member 60 may be provided in the same region as the plastic member 40, or may be provided in a region narrower than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

  Further, the thickness of the inner label member 60 is not limited to this, but can be set to, for example, about 1 μm to 100 μm in a state of being attached to the container body 10.

  In addition, since the configurations of the container body 10 and the plastic member 40 are substantially the same as those in the first embodiment described above, detailed description thereof is omitted here.

  Next, the structure of the composite preform according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 12, the composite preform 70 includes a plastic material preform 10a, a bottomed cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. And a bottomed cylindrical plastic member 40a provided in close contact with the outside.

  The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a so that it does not easily move or rotate, or is in close contact with the preform 10a so that it does not fall by its own weight. The inner label member 60a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

  The inner label member 60a may be previously designed or printed. For example, in addition to the design and product name, character information such as the name of the content liquid, the manufacturer, and the name of the raw material may be described. In this case, it is possible to display images and characters on the composite container 10A without separately providing a label or the like to the container body 10 after blow molding. For example, the inner label member 60a may be provided on all or part of the trunk portion 20a of the preform 10a, and images and characters may be displayed on the trunk portion 20 of the container body 10 after molding. This eliminates the need for a labeling process using a labeler after the container is tightly sealed, so that the manufacturing cost can be suppressed and the yield can be prevented from decreasing.

  As such an inner label member 60a, an unstretched film such as polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, or fluorine resin can be used. The inner label member 60a may be made of the same material as the container body 10 (preform 10a) and / or the plastic member 40a, or may be made of a different material.

  On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being bonded, and is in close contact with the preform 10a so that it does not move or rotate, or close enough not to fall by its own weight. Has been.

  The inner label member 60a and the plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Furthermore, the inner label member 60a and the plastic member 40a are not limited to one, and a plurality of inner label members 60a and plastic members 40a may be provided. For example, the two inner label members 60a and the plastic member 40a may be provided at two locations on the outer side of the body portion 20a.

  In addition, since the configurations of the preform 10a and the plastic member 40a are substantially the same as those in the first embodiment described above, detailed description thereof is omitted here.

  Next, a manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS.

  First, a preform 10a made of a plastic material is prepared (see FIG. 13A). The preform 10a has a mouth portion 11a, a body portion 20a having a diameter of 25 to 100 mm, and a substantially hemispherical bottom portion 30a.

  Next, an inner label member 60a is provided outside the preform 10a, and a plastic member 40a is provided outside the inner label member 60a. Thus, a composite preform 70 having the preform 10a, the inner label member 60a in close contact with the outer side of the preform 10a, and the plastic member 40a in close contact with the outer side of the inner label member 60a is produced (FIG. 13). (See (b)). In this case, the inner label member 60 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

  At this time, even if the inner label member 60a and the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a are pressed into the preform 10a, the inner label member 60a may be brought into close contact with the outer surface of the preform 10a good. Alternatively, the inner label member 60a and the plastic member 40a having heat shrinkability are provided on the outer surface of the preform 10a, and the inner label member 60a and the plastic member 40a are thermally contracted by heating to 50 ° C. to 100 ° C. You may make it closely_contact | adhere to the outer surface of the preform 10a.

  Alternatively, a plastic member 40a may be provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member 40a may be integrally attached to the outside of the preform 10a. Alternatively, the inner label member 60a may be provided outside the preform 10a, and then the plastic member 40a may be provided outside the inner label member 60a.

  In this way, a series of steps for producing the composite preform 70 by previously bringing the plastic member 40a into close contact with the outside of the preform 10a and the inner label member 60a and producing the composite preform 70 (FIG. 13 ( a) to (b)) and a series of steps (FIGS. 13 (d) to (f)) for producing the composite container 10A by blow molding can be carried out in different places (factory or the like).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 13C).

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow mold 50. The composite container 10A is molded using this blow molding die 50, and is substantially the same as in the case of the first embodiment described above, and the container body 10 and the inner label member provided on the outer surface of the container body 10. 60 and the composite container 10A provided with the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 13D to 13F). At this time, the transverse stretching ratio of the preform 10a with respect to the container body 10 is 3.5 times or less, and the problem that the plastic member 40a and the inner label member 60a are stretched and broken is prevented. .

  In addition, the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment is substantially the same as in the case of the above-described first embodiment, and thus detailed description thereof is omitted here.

14 (a) to 14 (f) and FIGS. 15 (a) to 15 (g) are diagrams showing modifications of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment, respectively. It is. 14 (a) to 14 (f) and FIGS. 15 (a) to 15 (g), the same parts as those in FIGS.

  14 (a) to 14 (f), the inner label member 60 is provided outside the preform 10a, and the plastic member (outer contraction member) 40a is provided outside the inner label member 60. Other configurations are substantially the same as those shown in FIGS. 6 (a) to 6 (f).

  15A to 15G, the inner label member 60 is provided outside the preform 10a, and the plastic member (outer contraction member) 40a is provided outside the inner label member 60. Other configurations are substantially the same as those shown in FIGS. 7 (a) to 7 (g).

Modification of Composite Container and Composite Preform Next, a modification of the present embodiment will be described with reference to FIGS.

  The modification shown in FIGS. 16 and 17 does not have a body portion and a bottom portion as the inner label member 60a and the plastic member 40a, but uses a cylindrical inner label member 60a and a plastic member 40a. . Other configurations are substantially the same as those of the embodiment shown in FIGS. In the modification shown in FIGS. 16 and 17, the same parts as those in the embodiment shown in FIGS. 10 to 13 are denoted by the same reference numerals, and detailed description thereof is omitted. The manufacturing method of the composite container 10A and the manufacturing method of the composite preform 70 are also substantially the same as those in the embodiment shown in FIGS.

  Next, specific examples of the present embodiment will be described.

  First, the following two types of preforms (Example 1 and Comparative Example 1) were produced by injection molding.

Example 1
A PET preform 10a (Example 1) according to the present embodiment was produced. In this preform 10a (Example 1), the diameter _{d 1} of the body portion 20a and 26 mm, a height _{h 1} from the lower flange portion 17 to the lowest point of the bottom 30a and 76 mm, the mouth portion 11a height h ₂ was 21 mm, and the maximum thickness t ₁ of the preform 10a in the body portion 20a was 3.5 mm.

(Comparative Example 1)
A PET preform (Comparative Example 1) having a conventional general shape was produced. In this preform (Comparative Example 1), the diameter d ₁ of the body portion is 22 mm, the height h ₁ from the bottom of the flange portion to the lowest point of the bottom portion is 80 mm, and the height h ₂ of the mouth portion is 21 mm. The maximum thickness t _{1 of the} preform in the trunk was 3.8 mm.

Next, a plastic member 40a having a corresponding inner diameter is attached to each of these two types of preforms (Example 1 and Comparative Example 1), and in the same manner as the method shown in FIGS. A composite container 10A having the container body 10 and the plastic member 40 was produced by biaxial stretch blow molding. As the plastic member 40a, using a polyethylene of direct blow molding tube, respectively, and that none the thickness t ₂ is 400 [mu] m.

In the container body 10 of the composite container 10A, the height _{H 1} from the lower flange portion 17 to the ground portion is 185 mm, the maximum diameter _{D 1} of the body portion 20 of the container body 10 was 90 mm. The full capacity of the container body 10 was 1000 ml.

  As a result, the draw ratio of the preform 10a of Example 1 was 3.46 times, and no breakage occurred in the plastic member 40a. On the other hand, the draw ratio of the preform of Comparative Example 1 was 4.09 times, and the plastic member 40a was broken.

DESCRIPTION OF SYMBOLS 10 Container body 10A Composite container 10a Preform 11, 11a Mouth part 12 Shoulder part 13 Neck part 14 Screw part 17 Flange part 20, 20a Body part 30, 30a Bottom part 40, 40a Plastic member 41 Body part 42 Bottom part 50 Blow molding die 60, 60a Inner label member 61 Body 62 Bottom 70 Composite preform

Claims (7)

In the manufacturing method of the composite container,
A step of preparing a preform made of a plastic material while having a mouth portion, a trunk portion, and a bottom portion;
Providing a plastic member on the outside of the preform;
By subjecting the preform and the plastic member to blow molding using a blow molding die, the preform and the plastic member are expanded as a unit, and a container body corresponding to the preform, A step of producing a composite container having a plastic member provided in close contact with the outside of the container body,
In the step of producing the composite container, a method of manufacturing a composite container, wherein a transverse stretching ratio of the preform with respect to the container body is set to 3.5 times or less.   The method for manufacturing a composite container according to claim 1, wherein a maximum thickness of the body portion of the preform is 2 mm to 10 mm.   The method for producing a composite container according to claim 1 or 2, wherein the plastic member before blow molding has a maximum thickness of 0.1 mm to 2 mm.   A composite preform used in the method for producing a composite container according to claim 1.   The composite preform according to claim 4, wherein a maximum thickness of the body portion of the preform is 2 mm to 10 mm.   6. The composite preform according to claim 4, wherein a maximum thickness of the plastic member is 0.1 mm to 2 mm.   A composite container produced by the composite container manufacturing method according to any one of claims 1 to 3.

Images