JP2005193957A - Glass board carrying case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass board carrying case which has a low dust generating property, and is excellent in wear resistance as well. <P>SOLUTION: This glass board carrying case is constituted in such a manner that a groove section 1 made of a resin expanded body 2 in order to support glass boards is provided on the internal wall of the case, and at the same time, a coating layer 3 is provided on the surface of the groove section 1 made of the resin expanded body 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a glass substrate used for a liquid crystal display panel, a plasma display panel, or the like, or a glass substrate carrying case for carrying these liquid crystal display panels, plasma display panels, and the like.

  In general, a flat panel display such as a plasma display or a liquid crystal display uses a thin glass plate in which a semiconductor element or the like is incorporated as a constituent substrate. When transporting such a glass plate, in order not to damage the glass plate itself or the semiconductor elements incorporated in the glass plate, or packing a plurality of glass plates over a cushioning material, or Means such as inserting and holding a glass plate in each groove using a transfer case provided with a plurality of grooves (corrugated plates) for gripping the end of the glass substrate inside the case are used. For example, Japanese Patent Application Laid-Open No. 7-132986 (Patent Document 1) discloses a glass substrate transport box provided with a support groove portion made of a foamed material such as polyolefin resin.

  However, the conveyance case provided with the support groove portion made of such a foam has the following problems. That is, when the glass substrate is transported, the groove portion (corrugated plate) made of a foam provided to support the glass substrate and the glass substrate are rubbed by vibration during transport to generate dust from the foam. Since the dust generation material adheres to the glass substrate, it has been necessary to perform glass substrate cleaning for removing the dust generation material.

  In addition, dust generated on the glass substrate absorbs moisture in the atmosphere and the adhesion with the glass substrate increases over time. Therefore, wet cleaning is necessary to remove such deposit. It becomes. However, a glass substrate on which a semiconductor element or the like is formed cannot be wet-cleaned, so that there is a problem that adhering substances cannot be removed sufficiently.

Furthermore, since the foam is deformed or damaged due to collision or friction with the glass substrate, it is necessary to periodically replace the foam part.
JP 7-132986 A

Summary of the Invention

  The present inventors have recently suppressed the dust generation caused by friction between the resin foam and the glass substrate by providing a coating layer on the surface of the resin foam in the groove provided to support the glass substrate. The knowledge that it will be. The present invention is based on this finding.

  That is, the present invention is to provide a case for carrying a glass substrate that has bottom dust generation and excellent wear resistance.

  The glass substrate carrying case according to the present invention is a glass substrate carrying case in which a groove portion made of a resin foam for supporting the glass substrate is provided on the inner wall of the case, and the groove portion made of the resin foam. A coating layer is provided on the surface.

  Thus, by providing a coating layer on the surface of the resin foam in the groove provided to support the glass substrate, dust generation caused by friction between the resin foam and the glass substrate can be suppressed, and glass can be used. The load of the substrate is dispersed over the entire surface of the resin foam, so that the contact pressure is reduced, and deformation and breakage of the resin foam can be prevented.

DETAILED DESCRIPTION OF THE INVENTION

  Hereinafter, the case for conveying a glass substrate according to the present invention will be described in detail.

  FIG. 1 is an enlarged view of a groove provided on the inner wall of a glass substrate transfer case according to the present invention for supporting a glass substrate. The groove part 1 is comprised from the buffer part which consists of the resin foam 2, and the coating layer 3 part provided on the resin foam surface.

  In the preferred embodiment of the present invention, as shown in FIG. 2, the coating layer 3 includes a base material 4 and a hard coat layer 5 provided on at least one surface of the base material 4. It is preferable. In this way, by covering the surface of the resin foam with a resin coating layer provided with a hard coat layer on the base material, the wear resistance of the glass substrate supporting groove (corrugated plate) is improved, and dust generation, etc. Can prevent contamination of the glass substrate.

  As a base material constituting such a coating layer, a thermoplastic resin film is preferably used from the viewpoint of processability, and specifically, a polyethylene terephthalate film, a polybutylene terephthalate film, a cellulose triacetate film, acrylonitrile, butadiene, Styrene resin film, acrylonitrile styrene resin film, acrylonitrile thermoplastic resin film, polyamide film, polycarbonate film, polyethylene film, polypropylene film, polyacetal film, polymethyl methacrylate film, polystyrene film, polytetrafluoroethylene film, polyvinyl chloride film, Polyimide film, polyetheretherketone film, polyphenylene sulfide film Lum, polyvinyl alcohol film, can be exemplified polyphenylene oxide film, etc., but is not limited thereto. Among these, a polyethylene terephthalate film can be preferably used.

  The hard coat layer constituting the coating layer is for improving the surface height of the substrate surface and further improving the wear resistance of the groove. The hard coat layer means a layer having a hardness of at least H or more in a pencil hardness test shown by JIS K5400.

  The hard coat layer can be formed using a resin having a relatively high hardness, and in particular, a thermosetting resin or a photocurable resin can be preferably used. Examples of thermosetting resins include phenolic resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, unsaturated polyester resins, polyurethane resins, epoxy resins, aminoalkyd resins, melamine-urea co-condensation resins, silicon resins, and the like. It is done. Examples of the photocurable resin monomer include monofunctional or polyfunctional acrylate monomers. Specifically, bisphenol A / ethylene oxide modified diacrylate, dipentaerythritol hexa (penta) acrylate, dipentaerythritol. Monohydroxypentaacrylate, dipropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, glycerin propoxytriacrylate, 4-hydroxybutyl acrylate, 1,6-hexanehexanediol diacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl Acrylate, isobornyl acrylate, polyethylene glycol diacrylate, pentaerythritol triacrylate, tetrahydrofurfuryl Acrylate, trimethylolpropane triacrylate, and tripropylene glycol diacrylate, and can be exemplified those one or oligomers obtained by polymerizing two or more kinds or the like, but is not limited thereto. In the present invention, among these, a copolymer of dipentaerythritol hexa (penta) acrylate, pentaerythritol triacrylate, and an acrylic monomer can be preferably used.

  The hard coat layer can also be formed by coating the base material with a hard coat layer forming coating solution obtained by dissolving the resin in a solvent or the like. As a coating method, a roll coating method, a gravure coating method, a slide coating method, a spray coating method, a dip coating method, a screen printing method, or the like can be used. After coating, drying, heating, and ultraviolet rays are performed as necessary for curing. A hard coat layer can be formed by curing by irradiation or electron beam irradiation.

  The thickness of the hard coat layer is preferably 0.5 to 10 μm, and particularly preferably 3 to 7 μm. If the thickness of the hard coat layer is less than 0.5 μm, improvement in the surface hardness of the coating layer cannot be expected, and if it exceeds 10 μm, the substrate film is curled, which is not preferable from the viewpoint of workability.

  According to a preferred embodiment of the present invention, as shown in FIG. 2, the coating layer 3 further comprises a heat seal layer 6 provided between the base material 4 and the resin foam 2. By providing the heat seal layer, the adhesive force between the resin foam and the coating layer is improved, and when the coating layer is provided on the surface of the groove having an uneven shape, the followability of the coating layer to the groove is improved. In the present specification, the term “heat seal layer” means that the same kind or different kinds of thermoplastic resins are bonded to each other by heat, and this heat seal layer is covered by a heat laminating process or a sealing process. It has a function capable of adhering to a sealing material (base material or resin foam).

  The heat seal layer can be formed using a polyolefin heat seal material, a polyester heat seal material, an ethylene-methacrylic acid copolymer ionomer heat seal material, or the like, and polyethylene is particularly preferable. Specifically, a polyethylene stretched film (OPP) can be suitably used.

  The heat seal layer can be formed by providing a polyethylene film on the surface of the substrate opposite to the side on which the hard coat layer is provided, and heating and fusing them. Although the thickness of a heat seal layer can be determined suitably, it is about 50-500 micrometers in general.

  In the glass substrate carrying case according to the present invention, it is preferable that the groove for supporting the glass substrate is formed by integrally molding the resin foam and the coating layer. Thus, by integrally molding the resin foam and the coating layer, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  The coating layer may be added with an antistatic agent or the like as appropriate in order to prevent the charging property of the glass substrate.

  A conventional method can be used to integrally form the groove. For example, as shown in FIG. 3, a coating layer forming resin film 3 is placed on the surface of a mold 8 in which a groove is formed, and foam beads 7 are filled in the mold, and steam or the like is supplied to the mold. A groove portion made of a resin-coated resin foam can be formed by blowing into a foam and heating.

  Moreover, since the heat sealing layer is provided in the coating layer in this invention, the adhesive force of a resin foam and a coating layer can be improved by integrally molding in this way.

  In the thus formed glass substrate supporting groove, the thickness of the coating layer is preferably 25 to 100 μm. Most preferably, it is 50-75 micrometers. If the thickness of the coating layer is less than 25 μm, the coating layer is torn or worn due to friction between the glass substrate and the coating layer, and the foam is exposed. On the other hand, when the thickness exceeds 100 μm, the resin film does not follow the unevenness of the mold when the groove portion is molded by the mold, and the molding becomes difficult. Moreover, even if it is a case where it can shape | mold, it becomes difficult to form the groove part which has a uniform uneven | corrugated shape.

  Specifically, the resin foam 2 constituting the case for transporting a glass substrate according to the present invention is a polyethylene type such as low density polyethylene, high density polyethylene, ethylene-styrene copolymer, ethylene-vinyl acetate copolymer, and ionomer. Polyolefin resin foams such as foams and polypropylene foams can be suitably used. In particular, an ethylene-styrene copolymer is preferably used from the viewpoint of the processing accuracy of the groove. The foaming ratio of the resin foam can be set in a range of 15 to 30 times in consideration of buffer performance (cushioning properties) and strength.

  The resin foam is produced by filling a polyolefin foam bead containing a foaming agent or its primary foam as described above into a mold and heating to a predetermined temperature. A volatile foaming agent, a chemical decomposition foaming agent, or the like is used, and these two or more foaming agents can be used in appropriate combination.

  Further, the shape of the groove for supporting the glass substrate provided on the inner wall of the glass substrate carrying case is tapered or rounded as shown in FIG. 1 in order to reduce the contact with the glass substrate. It is preferable to make it.

  Furthermore, it is preferable that the groove portion is formed with a plurality of grooves (corrugated) so that a plurality of glass substrates can be accommodated.

  Next, an example is given and the case for glass substrate conveyance by the present invention is explained still in detail.

1. Production of glass substrate transport case The base film shown in Table 1 was used as the resin film for the coating layer. A coating layer is formed by laminating a copolymer film (manufactured by Dai Nippon Printing Co., Ltd.) of dipentaerythritol hexa (penta) acrylate, pentaerythritol triacrylate, and an acrylic monomer on this base film. A film was prepared. The film for forming a coating layer thus obtained is placed in a molding die, filled with composite resin foam beads (trade name: PIOCELAN, manufactured by Sekisui Chemical Co., Ltd.), and foamed by blowing water vapor into the die. Then, a glass substrate carrying case provided with a groove having a coating layer as shown in FIG. 1 was produced (Examples 1 to 8).

  Moreover, the base film which does not provide a hard-coat layer was arrange | positioned to a shaping die, and the case for glass substrate conveyance was produced like the above (Comparative Examples 1-8).

  Further, a glass substrate carrying case was produced in the same manner as described above without arranging the coating layer forming film (Comparative Example 9).

2. Test Evaluation Next, 60 glass substrates of 1500 mm × 1100 mm were accommodated in the obtained glass substrate carrying case, and the carrying case was reciprocated 50 times with an amplitude of 10 mm. Thereafter, the glass substrate was taken out from the carrying case, and dust generated on the glass substrate was visually observed.

  The evaluation criteria are as follows.

○: No foreign matter such as dust was confirmed. △: Foreign matter such as dust was confirmed that there was no problem in use. ×: Foreign matter such as dust was confirmed. : Conspicuous foreign matter such as dust was confirmed Further, deformation and damage of the groove in the transfer case were also observed visually.

  The evaluation criteria are as follows.

○: Deformation / damage was not confirmed. △: Deformation / damage was confirmed to the extent that there was no problem in use. X: Deformation / damage was confirmed. XX: Remarkable deformation / damage was confirmed. The evaluation results are as shown in Table 1.

  Moreover, about the glass substrate conveyance case of Example 1 and Comparative Example 1, virtual transport test evaluation was performed in the following way. That is, 60 sheets of a 1500 mm × 1100 mm plasma display back plate (filmed and patterned on a glass substrate) were accommodated in the glass substrate carrying case obtained above. Next, the carrying case was installed in a vibration tester (electrohydraulic vibration tester: manufactured by Enomiya Seisakusho) and evaluated according to JIS-Z-0200 test method 1A. The vibration conditions are as follows and correspond to transportation of 2000 km travel.

Frequency 5-100HZ in both vertical and horizontal directions
Acceleration on vibration board 0.75G in both vertical and horizontal directions
Sweep time Up and down, left and right direction 999 seconds Vibration time Up and down direction 60 minutes, left and right direction 20 minutes After virtual transport test, take the glass substrate out of the transport case and generate dust on the glass substrate edge near the groove The degree of adhesion of the object was visually observed.

  The evaluation criteria are as follows.

○: No foreign matter such as dust was confirmed. △: Foreign matter such as dust was confirmed that there was no problem in use. ×: Foreign matter such as dust was confirmed. : Contaminated foreign matter such as dust was confirmed. Also, the back plate for plasma display was checked for the presence or absence of dust attached to the back plate pattern using an appearance tester (detection sensitivity of 20 μm or more). Examined. The number of dust particles adhering to one back plate was calculated as an average value of all 60 pieces.

  Further, the deformation and breakage of the groove in the transport case were also observed visually.

  The evaluation criteria are as follows.

○: Deformation / damage was not confirmed. △: Deformation / damage was confirmed to the extent that there was no problem in use. X: Deformation / damage was confirmed. XX: Remarkable deformation / damage was confirmed. The evaluation results were as shown in Table 2.

It is an enlarged view of the groove part provided in the inner wall of the case for glass substrate conveyance by this invention for supporting a glass substrate. The outline of the cross section of the coating layer provided on the resin foam is shown. The one aspect | mode of the metal mold | die forming method for producing the case for glass substrate conveyance by this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Groove part 2 Resin foam 3 Coating layer 4 Base material 5 Hard-coat layer 6 Heat seal layer 7 Foam bead 8 Mold

Claims (7)

  A groove portion made of a resin foam for supporting a glass substrate is a case for conveying a glass substrate provided on an inner wall of the case, and a coating layer is provided on a surface of the groove portion made of the resin foam. , Glass substrate transfer case.   The glass substrate carrying case according to claim 1, wherein the coating layer comprises a base material and a hard coat layer provided on at least one surface of the base material.   The glass substrate transport case according to claim 1, wherein the coating layer further includes a heat seal layer provided between the base material and the resin foam.   The glass substrate carrying case according to any one of claims 1 to 3, wherein the groove is formed by integrally molding the resin foam and the coating layer.   The glass substrate transport case according to claim 1, wherein the coating layer has a thickness of 25 to 100 μm.   The glass substrate carrying case according to any one of claims 2 to 5, wherein the hard coat layer is made of a photocurable acrylate resin. The glass substrate carrying case according to any one of claims 3 to 6, wherein the heat seal layer is made of polyethylene.

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