JPWO2009008413A1 - Glass plate interleaving paper and glass plate laminate - Google Patents

Abstract

The present invention provides an interleaving paper for glass plate and a glass plate laminate capable of reliably grasping the interleaving paper protruding from the edge of the glass plate by a take-out device and taking out only the interleaving paper from a box or a pallet. The slip sheet for glass plate of the present invention is a slip sheet 36 having a Gurley stiffness of 0.2 mN or more according to JAPAN TAPPI No. 40 and a smoothness of 18 seconds or less according to JIS P8119. Thereby, it is possible to prevent an unpacker's slip sheet gripping error and troubles when taking out the slip sheet from the box or pallet.

Description

  The present invention relates to paper sandwiched between glass plates during storage and / or transportation of glass plates, that is, a glass plate interleaf, and a glass plate laminate using the interleaf.

  Glass plates for FPD such as glass plates for construction, glass plates for automobiles, glass substrates for plasma displays and liquid crystal glass substrates are scratched or contaminated on the surface during storage and / or transportation. It is prone to product defects. In particular, when used as a glass substrate that incorporates an electric circuit or the like on its surface, such as a non-alkali glass substrate used for a liquid crystal display, even if there are slight scratches or contamination on the surface, disconnection or poor patterning may occur. appear. Therefore, such a glass substrate is required to have extremely high surface characteristics.

  Scratches on the surface of a glass plate often occur due to deviation between adjacent glass plates when the glass plates are stacked and stored or transported. Moreover, contamination of the glass plate surface often occurs when organic substances in the transport atmosphere adhere to the glass plate surface. This organic matter (contaminant) is difficult to remove from the surface of the glass plate only by washing with water. For example, it is necessary to wash with an acid or alkali. Waste liquid treatment costs also increase, and it is difficult to completely remove organic substances from the glass plate surface even with such cleaning.

  Therefore, as a method for preventing scratches or contamination during storage or transportation of glass plates, a method of interposing so-called slip sheets has been conventionally used in which paper is sandwiched between laminated glass plates and the surfaces of adjacent glass plates are separated. It is taken.

  However, in the method of interposing the interleaving paper, since the interleaving paper is in direct contact with the glass plate surface, a problem arises that the resin component of the interleaving paper is transferred to the glass plate surface and contaminates the glass plate surface. In order to avoid this, currently methods such as using slip sheets with low resin component content are used, but it is practically extremely difficult to precisely control the amount of resin component transferred from slip sheets. In addition, such slip sheets are more expensive than plain papers, which increases costs.

  Therefore, a glass sheet slip sheet as exemplified below has been proposed.

  Patent Document 1 describes a glass slip sheet containing 0.1% by weight or more of sodium tripolyphosphate. And, by using this slip sheet, it is stated that effects such as water repellency on the glass surface and avoiding paper traces can be obtained without strictly controlling the properties of the slip sheet as in the past. Has been.

Patent Document 2 describes a slip sheet for glass sandwiched between glass plates and containing 50 mg / m ² or more of sodium tetraborate. And the traces of the paper skin appearing on the glass plate surface due to adhesion of water vapor etc. are presumed to be due to transfer unevenness such as fatty acid sodium of the resin content or hydrolyzate thereof from the slip paper, The effect of facilitating removal of these water-repellent sources by washing is described.

JP-A-6-316432 Japanese Patent Laid-Open No. 7-101483

  By the way, the glass plate interposing the interleaving paper is conveyed from the glass manufacturer to the glass plate manufacturer who processes and assembles the glass plate in a state of being laminated on the box or pallet. The pallets are taken out one by one by a take-out device called an unpacker (robot or dedicated machine). At this time, the operation of adsorbing and taking out the glass plate by the glass adsorbing portion of the unpacker and then taking out the interleaving paper is repeated, but when taking out the interleaving paper, the portion that protrudes from the edge of the glass plate In many cases, the slip sheet is picked up by suction or chucking.

  However, when the slip of the slip sheet is weak, the protruded slip sheet may hang down, and the unpacker may not be able to satisfactorily grip the sag portion (the portion that protrudes from the edge of the glass plate). There are two types of glass plates: vertical stacks stacked on boxes or pallets, and flat stacks stacked flat on boxes or pallets. When laminating a plate on a box or pallet, the slip sheet that protrudes from the upper side hangs down and is sandwiched between the next laminated glass plates, and the unpacker grips the slip sheet well when taking out the slip sheet. There are things that cannot be done. In particular, the size of FPD glass substrates tends to increase, and as a result, slip sheets are required to be as large as the size of FPD glass substrates. For example, they are used for packaging sixth-generation FPD glass substrates. The size of the slip sheet is about 1500 mm × 1800 mm. When the slip sheet size is increased in this way, the frequency of occurrence of trouble that the slip sheet cannot be taken out due to the gripping error of the slip sheet increases.

  In addition, when gripping the protruding slip sheet by suction, the suction force of the unpacker slip sheet suction portion penetrates the slip sheet and reaches the next slip sheet, and sucks two slip sheets at the same time. In some cases, this may cause problems. This problem can be dealt with by setting the suction force when adsorbing the slip sheet to be weak, but if it is set too weak, the slip sheet cannot be taken out. Since the problem of adsorbing occurs, fine adjustment is necessary to prevent the problem from occurring.

  In addition, the adhesiveness between the slip sheet and the glass plate is too strong, and when the slip sheet is taken out from the box or pallet, there is a problem that the glass plate is in close contact with the slip sheet and the glass plate is taken out at the same time. There is.

  The present invention has been made in view of the above circumstances, and is a glass that can reliably hold the slip sheet protruding from the edge of the glass plate by the take-out device, and can satisfactorily take out the slip sheet from the box or pallet. An object of the present invention is to provide a laminated paper for a plate and a glass plate laminate.

  In order to achieve the above object, the present invention relates to a glass sheet slip sheet interposed between glass sheets, wherein the slip sheet has a Gurley stiffness of 0.2 mN or more.

  When the Gurley stiffness (hereinafter referred to as Gurley stiffness) in accordance with JAPAN TAPPI No. 40 of the interleaving paper is low, that is, when the interleaving paper is weak, the sagging paper hangs down and the sagging portion (the edge of the glass plate) The portion protruding from the portion may not be satisfactorily gripped by a gripping portion such as suction or chucking of the take-out device. Also, in the case of vertical stacking, when laminating the glass plates, if the slip of the interleaving paper is weak, the portion of the interleaving paper that protrudes from the upper side of the glass plate will hang down, and the sagging portion will be applied to the next laminated glass plate When the interleaving paper is picked up, there are cases where it cannot be satisfactorily gripped by a gripping part such as suction or chucking of the take-out device.

  The inventor of the present application confirmed by experiments that the Gurley stiffness of the slip sheet is required to be 0.2 mN or more in order to prevent the slip sheet gripping error that occurs during handling when taking out the slip sheet. Therefore, by setting the Gurley stiffness of the interleaving paper to 0.2 mN or more, when taking out the interleaving paper, it is possible to prevent an interleaving paper gripping error that occurs during handling, and to remove the interleaving paper that protrudes from the edge of the glass plate. Can be securely gripped and removed from the box or pallet. Also, in the case of vertical stacking, when the glass is laminated, the slip sheet is not sandwiched between the glass plates to be stacked next, so that it is possible to prevent a slip sheet gripping error that occurs during handling when the paper is taken out. The slip sheet protruding from the edge of the glass plate can be securely held by the take-out device and taken out from the box or pallet.

  In the slip sheet for glass plate of the present invention, the smoothness of the slip sheet is preferably 18 seconds or less.

  Moreover, when this inventor confirmed experimentally the cause of the malfunction of taking out a glass plate simultaneously when taking out a slip sheet when the adhesiveness of a slip sheet and a glass plate is too strong, JIS P8119 ( 1976) smoothness (hereinafter referred to as “smoothness”) exceeds 18 seconds, the problem occurs, and if the smoothness is 18 seconds or less, the problem does not occur. Therefore, the trouble at the time of taking out the slip sheet can be prevented by using the slip sheet having a smoothness of 18 seconds or less as the slip sheet of the glass plate.

  In the interleaving paper for a glass plate of the present invention, the air permeability of the interleaving paper is preferably 5 seconds or more.

  The inventor of the present application confirmed the cause of the malfunction of the take-out device such that two sheets of paper were sucked at a time during handling by suction when gripping the slip sheet, and found in the JIS P8117 of the slip sheet. It was found that the above-mentioned problem occurred in slip sheets having a compliant air permeability (hereinafter referred to as air permeability) of less than 5 seconds, and that the problem did not occur if the air permeability was 5 seconds or more. Therefore, the malfunction of the said taking-out apparatus can be prevented by using the slip sheet whose air permeability is 5 seconds or more as a slip sheet of a glass plate.

  Further, the present invention is a glass plate laminate in which at least two or more glass plates are laminated, wherein the glass plates are laminated with the interleaving paper interposed between at least some of the glass plates. Also provide.

  Therefore, according to the glass plate laminated body of the present invention, the slip sheet protruding from the edge of the glass plate can be reliably held by the take-out device, and only the slip sheet can be satisfactorily taken out from the box or pallet.

  When the glass sheet laminate according to the present invention is used, and according to the glass sheet laminate, since the Gurley stiffness is 0.2 mN or more, the glass sheet insert is securely held by the take-out device. And can be satisfactorily removed from the box or pallet.

The side view of the pallet which showed an example of the packing form of the glass substrate for FPD.

Explanation of symbols

  36 ... slip sheet, 36a ... protruding portion of slip sheet, 40 ... pallet for packing, 42 ... base, 44 ... tilting table,

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a glass plate interleaving paper and a glass plate laminate according to the present invention are described in detail below with reference to the accompanying drawings.

  FIG. 1 is a side view (schematic diagram) of a glass plate laminate showing an example of a packing form in which glass plates G are stacked and stored and / or conveyed.

  The packaging pallet 40 shown in FIG. 1 includes a base 42 and an inclined base 44 erected on the base 42, and a plurality of rectangular glass plates G are inclined on the inclined surface of the inclined base 44. The rectangular interleaf paper 36 is interposed between the glass plates G. The inclination angle is not limited as long as the laminated glass plates G can be stably stacked, stored, and transported, and may be 85 degrees or less with respect to the horizontal. In the present embodiment, the tilt angle of the tilt table 44 is 85 degrees to 70 degrees. In order to protect the glass plate G, the interleaf paper 36 is preferably larger than the glass plate G. Accordingly, a part of the interleaf paper 36 protrudes from the glass plate G, and the protruding portion 36a of the interleaf paper 36 is gripped by an unpacker (also referred to as a take-out device) (not shown) so that the interleaf paper 36 is packed. The pallet 40 is taken out. In addition, when the glass plates G are stacked vertically like the packing pallet 40, if the interleaf paper 36 protrudes from the lower side of the glass plate G, the glass plate G cannot be stacked without any gap, and the glass plate G is damaged during packing and transportation. Therefore, it is preferable that the interleaf paper 36 protrudes only on the upper side and the left and right sides. Further, the protruding portion 36 a of the slip sheet that is gripped when the unpacker takes out the slip sheet 36 may be the upper side portion or either the left or right portion. The form of the packing pallet is not limited to the vertically stacked form of the present embodiment, but may be a flatly stacked pallet or any form in which a plurality of glass plates are stacked and stored.

  The interleaf paper 36 of the embodiment has a Gurley stiffness of 0.2 mN or more. When the Gurley stiffness of the slip sheet 36 is low, that is, when the slip of the slip sheet 36 is weak, the portion 36a of the slip sheet 36 that protrudes from the edge of the glass plate G may hang down. In some cases, the protruding portion 36a cannot be reliably gripped by the unpacker. The inventor of the present application confirmed by experiments that the Gurley stiffness of the slip sheet 36 is required to be 0.2 mN or more in order to prevent such handling trouble of the slip sheet 36.

  The sizes and thicknesses of the glass plate G and the interleaf paper 36 are not limited, but when the size is equal to or larger than the interleaf paper size corresponding to the size of the glass substrate for 6th generation FPD (for example, 1500 mm × 1800 mm), and the interleaf thickness is 0. The case of 01 mm to 0.2 mm is particularly suitable. Further, the protrusion margin of the protruding portion 36a from the glass plate G (the length from the edge of the glass plate G to the edge of the protruding portion 36a of the interleaf paper 36) is particularly suitable when it is 30 mm to 100 mm. .

  Further, the slip sheet 36 preferably has a smoothness of 18 seconds or less. If the adhesion between the glass plate G and the interleaf paper 36 is strong, there may be a problem that the glass plate G is taken out together when the interleaf paper 36 is gripped and taken out. In particular, in the case of a thin glass substrate for plasma display (for example, 2.5 mm) or a glass substrate for liquid crystal (for example, 0.7 mm), the adhesion between the interleaf paper 36 and the glass substrate becomes strong, and the interleaf paper 36 is gripped. Then, when taking out, it becomes easy to produce the malfunction of taking out to a glass substrate together. If the interleaf paper 36 has a smoothness of 18 seconds or less, there is no possibility that the glass sheet G is taken out together when the interleaf paper 36 is gripped and taken out. If the smoothness is 18 seconds or less, the interleaf paper 36 has a rough surface, and the contact area with the glass plate G becomes small. Therefore, it is difficult for the resin component in the interleaf paper 36 to be transferred to the glass plate G to cause a paper texture, burns, dirt, etc. on the glass surface.

  The raw material of the interleaf paper 36 may be waste paper, virgin pulp, or a mixture thereof. Furthermore, a raw material containing cellulose or the like may be used.

  On the other hand, the inventor of the present application has confirmed through experiments that the cause of the problem of the unpacker that two sheets of slip paper 36 are sucked at a time when gripping the slip sheet 36 by suction. It has been found that the above-mentioned problem occurs in the interleaf paper 36 of less than a second, and that the above-mentioned problem does not occur if the air permeability of the interleaf paper 36 is 5 seconds or more. Therefore, when the slip sheet 36 is gripped by the unpacker, the slip sheet is preferably a slip sheet having an air permeability of 5 seconds or more.

  In the present embodiment, the size of the foreign matter contained in the slip sheet 36 is preferably 200 μm or less. When the size of the foreign material is 200 μm or less, there is no possibility that the glass plate G is easily damaged during storage and transportation of the glass plate G. Note that the size of the foreign matter serving as the threshold differs depending on the thickness of the slip sheet 36 and the material of the glass plate G, and therefore the size of the foreign matter is determined depending on the material of the target glass plate G and the thickness of the slip sheet 36 each time. is required.

  In the present embodiment, the interleaf paper 36 has a size of 1800 × 1500 mm and a thickness of 0.06 to 0.1 mm, and the glass plate G uses a glass substrate for FPD (trade name: AN100, manufactured by Asahi Glass Co., Ltd.). It was.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2007-182232 filed on Jul. 11, 2007, the contents of which are incorporated herein by reference.

  The slip sheet for glass plate of the present invention can be suitably used for storage and / or conveyance of a glass plate.

Claims (4)

  A glass sheet slip sheet interposed between glass sheets, wherein the slip sheet has a Gurley stiffness of 0.2 mN or more.   2. The slip sheet for glass plate according to claim 1, wherein the smoothness of the slip sheet is 18 seconds or less.   The interleaving paper for glass sheets according to claim 1 or 2, wherein the air permeability of the interleaving paper is 5 seconds or more.   A glass plate laminate in which at least two glass plates are laminated, and the glass plates are laminated with the interleaving paper according to any one of claims 1 to 3 interposed between at least some of the glass plates. Glass plate laminate.

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