EP1452643B1 - Zwischenlagenpapier für Glas und glasartige Blattmaterialien - Google Patents

Zwischenlagenpapier für Glas und glasartige Blattmaterialien Download PDF

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Publication number
EP1452643B1
EP1452643B1 EP04004421A EP04004421A EP1452643B1 EP 1452643 B1 EP1452643 B1 EP 1452643B1 EP 04004421 A EP04004421 A EP 04004421A EP 04004421 A EP04004421 A EP 04004421A EP 1452643 B1 EP1452643 B1 EP 1452643B1
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EP
European Patent Office
Prior art keywords
glass
paper
sheet
nonwoven sheet
sample
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
EP04004421A
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English (en)
French (fr)
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EP1452643A1 (de
Inventor
Hiroshi c/o Ogaki Kojyo Nomura
Osamu c/o Ogaki Kojyo Kida
Hiroyuki c/o Ogaki Kojyo Sohmiya
Kazumi c/o Ogaki Kojyo Kanoh
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Futamura Chemical Co Ltd
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Futamura Chemical Co Ltd
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Publication date
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Publication of EP1452643A1 publication Critical patent/EP1452643A1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
    • D21H5/14—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of cellulose fibres only
    • D21H5/141—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of cellulose fibres only of fibrous cellulose derivatives
    • D21H5/143—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of cellulose fibres only of fibrous cellulose derivatives grafted or encapsulated cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/16—Pure paper, i.e. paper lacking or having low content of contaminants

Definitions

  • the present invention relates to inserting paper to be inserted between glass-like sheet materials at the time of transport or storage of such glass-like sheet materials, more particularly relates to inserting paper reducing dirt on the glass surface by the inserting paper itself and suppressing generation of dust.
  • inserting paper is inserted between the glass-like sheet materials in order to improve handling.
  • the conventional inserting paper in particular inserting paper made from recycled paper
  • the moisture on the surface of the glass reacts with the alkali ingredients of the glass to erode the glass and cause surface deterioration.
  • the ink contained in the recycled paper and the resin ingredients derived from the recycled paper material itself were transferred to the glass-like sheet materials to cause paper marks on the surface of the glass-like sheet materials.
  • inserting paper with dispersed cut holes for example, see Japanese Patent Publication (A) No. 5-208841
  • inserting paper in which zeolite is blended at the papermaking process for example, see Japanese Patent Publication (A) No. 7-41034
  • inserting paper coated on its surface with a water soluble resin for example, see Japanese Patent Publication (A) No. 9-170198
  • inserting paper adjusted in hot water solubility for example, see Japanese Patent Publication (A) No. 2003-41498
  • JP 2003-041498 A discloses a spacer paper, suitable for being placed between glass plates, said spacer paper being produced from mechanical pulp-made waste paper as a raw material, and having a content of hot-water soluble components in the range of 0.1 to 0.7 wt.%.
  • JP 05-208841 A discloses a plied paper for glass with notched perforations dispersed throughout its surface.
  • JP 2000-154492 A discloses an impregnated paper suitable as an interleaving paper or a packaging paper carried in a clean room, especially as an interleaving paper for a lead frame.
  • This impregnated paper is obtained by impregnating a base paper with a binder.
  • the impregnated paper has ⁇ 0.02 ppm contents of respective ions of all kinds extracted when carrying out an extraction treatment of 1 g of the impregnated paper with 70 ml of deionized water at 100°C for 1 h based on 1 cm 2 of the impregnated paper.
  • An object of the present invention is to provide inserting paper for clean glass-like sheet materials reducing transport and storage costs without relying on packaging spacers, preventing paper marks, and enabling electrostatic adhesion.
  • inserting paper for glass-like sheet materials as defined in claim 1 comprised of a nonwoven sheet made of cellulose, wherein a content of hot water solubles in the nonwoven sheet, as measured based on "TAPPI T207 om-81, Water Solubility of Wood and Pulp, 6.2. Not Water Solubility", is less than 0.1 wt%. Since the paper is made of a nonwoven sheet made of cellulose, inclusion of ingredients other than cellulose such as seen in inserting paper made from conventional pulp or inserting paper coated with resin is eliminated. As a result, the content of the hot water solubles can be reduced to less than 0.1 wt%. This is extremely effective in suppressing dirt on the glass surface during transport or storage (paper marks).
  • the nonwoven sheet is formed without using a binder. Since no binder is used in the formation of the nonwoven sheet, the inserting paper is formed from only cellulose (regenerated cellulose) and the transfer of impurities etc. contained to the glass surface such as seen in conventional inserting paper can be eliminated. As a result, it is possible to exhibit an even greater effect in suppressing dirt on the glass surface (paper marks), so transport and storage of glass-like sheet materials in an extremely clean state become possible.
  • the nonwoven sheet is pressed by a flat roller. Since the nonwoven sheet is pressed by a flat roller, it becomes possible to suppress generation of dust when using the inserting paper made of the nonwoven sheet.
  • the nonwoven sheet is supercalendered. Since the nonwoven sheet is supercalendered, it becomes possible to suppress generation of dust when using the inserting paper made of the nonwoven sheet. Since the smoothness of the surface of the nonwoven sheet is improved, the adhesion between the inserting paper (nonwoven sheet) and glass-like sheet materials utilizing static electricity is improved and the work of inserting the inserting paper between glass-like sheet materials is facilitated.
  • a surface roughness of the nonwoven sheet is not more than 1.5 ⁇ m as measured by a KES-FB-4S surface tester. Since the surface roughness is less than 1.5 ⁇ m, it is possible to obtain good electrostatic adhesion with the glass-like sheet materials.
  • the inserting paper for glass-like sheet materials of the present invention is a nonwoven sheet made from cellulose, in particular one in which the content of hot water solubles (hot water soluble ingredients) is suppressed to less than 0.1 wt% of the unit nonwoven sheet. Further, in the inserting paper for glass-like sheet materials of the present invention, the material made of the cellulose is formed into a nonwoven sheet without the use of a binder and the surface of the nonwoven sheet is suitably treated to prevent dust or supercalendered as explained in detail later.
  • the "cellulose” in the present invention is cellulose obtained from pulp prepared from cotton, wood chips, etc. by alkali dissolution etc. using the viscose process, cuprammonium process, or other known cellulose regenerating process (so-called "regenerated cellulose”).
  • This regenerated cellulose includes fiber-shaped rayon (viscose process) and cuprammonium cellulose (cuprammonium process). Since the above-mentioned rayon or other regenerated cellulose is used for the material for the nonwoven sheet of the present invention, the paper differs from inserting paper produced by recycling paper and inserting paper produced by wood pulp etc. and is increased in uniformity of the contained ingredients.
  • inserting paper for glass-like sheet materials is suitably made a nonwoven sheet made from cellulose.
  • the nonwoven sheet there is also the method of adding various known binders to the fiber-shaped cellulose.
  • a nonwoven sheet formed without using a binder should be used.
  • the needle punching process of punching fibers of prespun rayon or cuprammonium cellulose by needles to entangle them etc. may be illustrated, but the needles have to be suitably coated with a lubricating oil. Therefore, this is not preferred for the same reasons as with utilization of a loom.
  • a production process like the spunlace process entangling adjoining fibers of preformed rayon, cuprammonium cellulose, etc. by high pressure jets of water is utilized so as to produce a nonwoven sheet made of regenerated cellulose.
  • rayon the method of continuously spinning a fiber solution (viscose) and adhering the fibers with each other by hot pressing to produce the nonwoven sheet
  • cuprammonium cellulose the method of continuously adhesion by hydrogen bonds utilizing the surface swellability of active fibers in the unregenerated state (Blau Faden (blue fiber)) and entangling the fibers by high pressure jets of water to produce the nonwoven sheet may be illustrated.
  • the "hot water solubles" in the present invention are the ingredients dissolving in hot water expressed as a percent of the total weight of the nonwoven sheet.
  • the hot water solubles is used as an indicator for determining the elution of ingredients of the inserting paper.
  • the hot water solubles in the present invention is measured based on "TAPPI T207 om-81, Water Solubility of Wood and Pulp, 6.2. Hot Water Solubility" prepared by the Technical Association of the Pulp and Paper Industries (TAPPI).
  • TAPPI Technical Association of the Pulp and Paper Industries
  • the present invention uses cellulose as the material and does not include almost any other impurities, so it is possible to reduce the hot water solubles to less than 0.1 wt%. This is considered effective for preventing paper marks on the surface of the glass-like sheet materials (in particular, glass substrates).
  • Fibers (cellulose) obtained from cotton, pulp, etc. are made to react with carbon disulfide in the presence of an alkali to prepare viscose. This is spun in a spinning bath containing formaldehyde or another methylolation agent to obtain a spun fiber 10 comprised of three layers shown in the sectional view of FIG. 1, that is, cellulose 11, hydroxymethyl cellulose xanthate (hereinafter referred to as "HMCX”) 12, and sodium cellulose xanthate (hereinafter referred to as "NaCX”) 13.
  • HMCX hydroxymethyl cellulose xanthate
  • NaCX sodium cellulose xanthate
  • the above three-layer spun fiber 10 is suitably cut, dispersed, and processed to form a substantially planar material.
  • the HMCX is liquified by heat and nearby spun fibers are fused together.
  • the HMCX breaks down and is changed to cellulose to form the fused parts 21 shown in the partially enlarged view of FIG. 2 and solidify.
  • the material is shrunken at a suitable temperature and pH in the presence of a weak acid whereby the above-mentioned HMCX and NaCX are converted to cellulose.
  • the material is bleached, rinsed, dried, etc., whereby a nonwoven sheet 20 made of cellulose and formed without using a binder is obtained.
  • Reference numeral 22 shows the regenerated cellulose converted to cellulose inside.
  • the present invention for glass-like sheet materials of the present invention contains cellulose derivatives in its production process, but these are finally converted to cellulose, so cellulose can be said to be its material.
  • the nonwoven sheet in particular at the time of embossing, it is preferable to further press the material by a flat roller. If using a flat roller in this way, the spun fibers fused by the embossing further are pressed by the flat roller to smooth the material and simultaneously keep down fluff of the short spun fibers. Therefore, the pressing by the flat roller acts effectively as treatment for preventing dust. Note that the shape and size of the embossing, the amount of pressing by the flat roller, etc. are suitably set.
  • the nonwoven sheet obtained by complete conversion of the internal ingredients of the spun fiber to cellulose and by bleaching, rinsing, drying, etc. is sometimes treated to prevent dust by suction of the fluff on the surface of the nonwoven sheet by using the suction system 30 shown in the schematic sectional view of FIG. 3 for example at the time of taking it up after drying.
  • the suction system 30 blows air injected from a pressurizer 32 to the surface of the nonwoven sheet 20 transferred by a transfer roller 45 while causing the surface of the nonwoven sheet to vibrate through application of ultrasonic waves from an ultrasonic wave generator 33 so as to free the dust generating factors of the nonwoven sheet 20, sucks them into the suction unit 31, and exhausts them outside from the exhaust port 35.
  • Reference numeral 34 is a suction port, while 40 is a static electricity eliminator.
  • the surface of the nonwoven sheet is rougher in surface shape compared even with the conventional inserting paper. Therefore, the contact area between the glass-like sheet material and the nonwoven sheet is smaller than that of the conventional inserting paper and it cannot be said that a sufficient effect of improvement of adhesion is obtained by the electrostatic charging. Accordingly, it can be said to be preferable to improve the smoothness of the nonwoven sheet as much as possible to improve the adhesion of the nonwoven sheet and glass-like sheet materials when charging them with static electricity.
  • supercalendering is performed.
  • the above supercalendering is usually performed by passing the nonwoven sheet of the present invention through multiple stages of a total of 5 to 20 stages of alternate metal rolls and nonmetal elastic rolls and pressing it by a linear pressure of 1900 to 2600 N/cm (maximum of about 3500 N/cm). Due to the supercalendering, the nonwoven sheet is subjected to a high pressure and becomes thinner. At the same time, the generation of dust from the surface of the nonwoven sheet is reduced and the smoothness is increased as well.
  • the pressure (linear pressure), temperature, moisture content of the nonwoven sheet, pressing time, and other treatment conditions in the supercalendering are suitably set.
  • the smoothness of the nonwoven sheet of the present invention is defined as the surface smoothness of the nonwoven sheet (inserting paper for glass-like sheet materials).
  • the surface roughness is quantized in measurement by a KES-FB-4S surface tester made by KES Co. and is suitably not more than 1.5 ⁇ m, preferably not more than 1.2 ⁇ m.
  • the more a sample is supercalendered to improve its smoothness the better the results obtained in electrostatic adhesion.
  • a link between the surface roughness and electrostatic adhesion is deduced and the suppression of surface roughness is used an indicator of improvement of the electrostatic adhesion.
  • the embossing using the embossing roller may be omitted in fusing the spun fibers and only pressing by the flat roller may be performed.
  • the pressing by the flat roller and the supercalendering are suitably incorporated into the process considering the production facilities, production costs, etc. They are not limited to the above process.
  • the inventors used a nonwoven sheet formed from cellulose without using a binder as the inserting paper for glass-like sheet materials of the present invention. They prepared a nonwoven sheet produced by the viscose process as explained in detail above (made by Futamura Kagaku Kogyo K.K., Taiko TCF) as the inserting paper for glass-like sheet materials of the example of the invention.
  • the nonwoven sheet of the example was pressed by a flat roller at the time of embossing as treatment for dust prevention.
  • inserting paper of the example of the invention using as comparative examples inserting paper actually used as the inserting paper for glass sheets for flat panel display substrates.
  • inserting paper of the comparative examples they used inserting paper comprised of acidic paper made by pulp by the usual method (made by N company, NDP) as Comparative Example 1, inserting paper comprised of neutral paper (made by N company, NDP), as Comparative Example 2, and inserting paper made from recycled paper (made by T company, ATP) as Comparative Example 3.
  • the inserting paper of the example of the invention and Comparative Examples 1 to 3 were evaluated based on the above "TAPPI T207 om-81, Water Solubility of Wood and Pulp, 6.2. Hot Water Solubility". Specifically, a 5 g sample was taken from the inserting paper of each of the example of the invention and Comparative Examples 1 to 3, 250 g of distilled water was added, and the mixture was continuously boiled for 30 minutes. The extract was filtered, 250 g of distilled water was again added, and boiling continued for 30 minutes. This operation was repeated three times and the extracts of the three times were combined.
  • the inserting paper for glass-like sheet materials of the example of the invention does not use a binder at the time of forming the pulp into paper as compared with the inserting papers of Comparative Examples 1 to 3, so the content of hot water solubles is clearly lower. It can be deduced that this is effective for preventing paper marks on the glass surface.
  • the inserting papers of the example of the invention and Comparative Examples 1 to 3 were cut to strips, arranged in parallel, and clamped between two pieces of sheet glass for a TFT-LCD module. Further, the glass was sandwiched between styrofoam so that a uniform pressure could be given and the assembly secured by rubber bands. The assembly of the sheet glass and inserting papers was exposed for a maximum of 318 hours to a temperature of 60°C and relative humidity of 95%.
  • Table 3 shows the elapse of exposure time and the dirt on the surface of the sheet glass.
  • Table 3 Elapsed time (hr)
  • Example cellulose nonwoven sheet
  • Comp. Ex. 1 acidic paper
  • Comp. Ex. 2 neutral paper
  • Comp. Ex. 3 (recycled paper) 118 1 3 2 4 145 1 3 2 4 178 1.5 1.5 3 4 226 1 2 3 4 298 1 2 3 4 318 1 2.5 2.5 4 Total 6.5 14 15.5 24
  • the inserting paper of the example of the invention can be said to exhibit good properties and stable quality compared with the inserting paper of any of the comparative examples.
  • the inserting paper of the example of the present invention that is, a nonwoven sheet formed using cellulose without using a binder, is suitable as inserting paper for glass-like sheet materials at the time of transport or storage of glass substrates where a high degree of cleanliness is required.
  • the inventors produced three types of nonwoven sheet differing in basis weight (g/m 2 ) and surface roughness ( ⁇ m) (made by Futamura Kagaku Kogyo K.K., Taiko TCF Series) obtained by the viscose process as explained in detail above.
  • the three types of nonwoven sheet are identified as the Sample 1-1, Sample 1-2, and Sample 1-3 in the following. Note that only the nonwoven sheet of Sample 1-3 was pressed by a flat roller at the time of embossing.
  • the inventors supercalendered the nonwoven sheets of Sample 1-1, Sample 1-2, and Sample 1-3 to control the smoothness of the surfaces of the nonwoven sheets.
  • the nonwoven sheet obtained by supercalendering Sample 1-1 is identified as Sample 2-1
  • the nonwoven sheet obtained by supercalendering Sample 1-2 is identified as Sample 2-2
  • the nonwoven sheet obtained by super calendering Sample 1-3 is identified as Sample 2-3.
  • the conditions of the supercalendering were 14 stages, 13 nips, a linear pressure of 1960 N/cm, a temperature of 80°C, and a processing speed of 60 m/min.
  • the surface roughnesses of the nonwoven sheets of the samples were measured using a KES-FB-4S surface tester made by KES Co.
  • the measurement conditions were a stationary load of 98 mN, a tension of 196 mN/cm, a probe contact length of 5 mm, a tensile speed of 0.1 cm/sec, and a tensile distance of 2 cm.
  • measurement was conducted five times each vertically and horizontally. The average value vertically and the average value horizontally were calculated and the larger value was used as the surface roughness of each sample.
  • nonwoven sheets of the samples cut to the A4 size (about 210 mm x 297 mm) were placed on TFT-LCD module sheet glass cut to the same A4 size.
  • an electrostatic charging system (Electrostatic Eliminator JPK-3 made by Kasuga Denki Inc. ) was used to give -20 kV of static electricity for charging.
  • the charging electrode opening of the electrostatic charging system was held at a position 5 cm right above the nonwoven sheets of the samples while charging the nonwoven sheets as a whole.
  • the sufficiently charged assembly of the sheet glass and nonwoven sheets of the samples was turned completely upside down and the times until the nonwoven sheets of the samples completely peeled off and dropped from the sheet glass were calculated. However, the time was only measured until 20 seconds.
  • a polyvinyl chloride simple hood of dimensions of a vertical 700 mm, horizontal 500 mm, and depth 500 mm was assembled openable at only one side.
  • a hole was formed at the center of the ceiling of this simple hood.
  • the suction port of an air particle counter (The Portable, made by HIAC/ROICO) was set suspended about 10 cm inside the simple hood.
  • Inserting paper for clean glass-like sheet materials reducing transport and storage costs without relying on packaging spacers, preventing paper marks, and providing electrostatic adhesion comprised of a nonwoven sheet made from regenerated cellulose obtained by the viscose process, cuprammonium process, or other cellulose regenerating process, in particular one suppressed in content of hot water solubles (heat water soluble ingredients) to less than 0.1 wt% per unit nonwoven sheet, wherein the nonwoven sheet is formed so that the regenerated cellulose fibers are fused through fused parts without use of a binder and the surface of the nonwoven sheet is treated for dust prevention by for example pressing by a flat roller, suction by a suction system, etc.
  • the obtained nonwoven sheet may be supercalendered.

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  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Buffer Packaging (AREA)
  • Packaging Frangible Articles (AREA)
  • Glass Compositions (AREA)

Claims (4)

  1. Einfügungspapier für glasartige Flachmaterialien, umfassend ein aus Cellulose erzeugtes Vliesstoff-Blatt, wobei das Vliesstoff-Blatt ohne Verwendung eines Bindemittels erzeugt ist, und wobei ein Anteil von in heißem Wasser löslichen Stoffen, gemessen basierend auf "TAPPI T207 om-81, Water solubility of Wood and Pulp, 6.2. Hot Water solubility", im Vliesstoff-Blatt weniger als 0,1 Gewichtsprozent ist.
  2. Einfügungspaper für glasartige Flachmaterialien nach Anspruch 1, wobei das Vliesstoff-Blatt durch eine flache Walze gepresst ist.
  3. Einfügungspapier für glasartige Flachmaterialien nach einem der Ansprüche 1 oder 2, wobei das Vliesstoff-Blatt superkalandriert ist.
  4. Einfügungspapier für glasartige Flachmaterialien nach einem der Ansprüche 1 bis 3, wobei eine Oberflächenrauigkeit des Vliesstoff-Blatts nicht mehr als 1,5 µm, gemessen durch einen KES-FB-4S Oberflächentester, ist.
EP04004421A 2003-02-28 2004-02-26 Zwischenlagenpapier für Glas und glasartige Blattmaterialien Expired - Lifetime EP1452643B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2003053324 2003-02-28
JP2003053324 2003-02-28
JP2003386527 2003-11-17
JP2003386527A JP4224381B2 (ja) 2003-02-28 2003-11-17 ガラス状板材の合紙

Publications (2)

Publication Number Publication Date
EP1452643A1 EP1452643A1 (de) 2004-09-01
EP1452643B1 true EP1452643B1 (de) 2006-04-26

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EP04004421A Expired - Lifetime EP1452643B1 (de) 2003-02-28 2004-02-26 Zwischenlagenpapier für Glas und glasartige Blattmaterialien

Country Status (7)

Country Link
US (1) US20040182531A1 (de)
EP (1) EP1452643B1 (de)
JP (1) JP4224381B2 (de)
KR (1) KR20040077455A (de)
AT (1) ATE324490T1 (de)
DE (1) DE602004000712T2 (de)
TW (1) TW200422238A (de)

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CN110446813B (zh) * 2017-03-30 2022-02-25 特种东海制纸株式会社 玻璃板用衬垫纸及其制造方法
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KR20040077455A (ko) 2004-09-04
TW200422238A (en) 2004-11-01
DE602004000712D1 (de) 2006-06-01
EP1452643A1 (de) 2004-09-01
ATE324490T1 (de) 2006-05-15
JP4224381B2 (ja) 2009-02-12
JP2004277991A (ja) 2004-10-07
DE602004000712T2 (de) 2006-11-02

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