TWI400204B - Glass plate with paper and glass plate laminated body - Google Patents

Description

Spacer and glass plate laminate for glass plate

The present invention relates to a paper which is sandwiched between glass sheets during storage and/or transportation of a glass sheet, that is, a spacer for glass sheets, and a glass sheet laminate using the spacer.

The glass substrate for FPD (flat panel display) such as a glass plate for a glass plate, a glass plate for an automobile, a glass substrate for a plasma display, or a glass substrate for a liquid crystal is stored and/or During transportation, the surface is easily scratched or contaminated, and it is easy to form product defects. In particular, when it is used as a non-alkali glass substrate for liquid crystal displays, when a glass substrate such as an electronic circuit is mounted on its surface, even if there is a small amount of scratch or contamination on the surface, a broken line or pattern is generated. Poor. Therefore, such a glass substrate is required to have extremely high surface characteristics.

Scratches on the surface of the glass sheet are often caused by the offset between the adjacent glass sheets when they are stored or transported on a laminated glass sheet. Moreover, the contamination of the surface of the glass sheet is often caused by the adhesion of organic substances in the conveying environment to the surface of the glass sheet. The organic matter (contaminant) is difficult to remove from the surface of the glass plate only by washing, and must be cleaned using, for example, an acid or a base, and the use of an acid or a base deteriorates the working environment during cleaning, and also increases the cost of cleaning and waste disposal. Moreover, even if such cleaning is performed, it is difficult to completely remove the organic matter from the surface of the glass plate.

Therefore, as a prevention of scratching or contamination during storage or transportation of the glass sheet In the prior art, a method of sandwiching paper between the laminated glass sheets to separate the surfaces of adjacent glass sheets has been previously employed.

However, in the method of interposing the spacer paper, since the spacer paper is in direct contact with the surface of the glass sheet, the resin component of the spacer paper is transferred onto the surface of the glass sheet, thereby causing a problem of contamination to the surface of the glass sheet. In order to avoid this problem, a method of using a spacer paper having a small content of a resin component is currently employed, but in fact, it is extremely difficult to accurately control the amount of transfer of the resin component from the spacer paper, and such a spacer paper The price is higher than that of plain paper, resulting in an increase in cost.

Therefore, there is proposed a spacer paper for a glass plate as exemplified below.

Patent Document 1 describes a spacer paper for glass containing 0.1% by weight or more of sodium tripolyphosphate. Further, it is described that by using the spacer paper, it is possible to obtain the water repellency on the glass surface and avoid the effect of the paper track without precisely controlling the properties of the spacer paper as before.

Further, Patent Document 2 discloses a spacer paper for glass characterized in that it is sandwiched between spacers of a glass plate and contains 50 mg/m ² of sodium tetraborate. Further, it is estimated that the trace of the paper grain which appears on the surface of the glass plate due to the adhesion of water vapor or the like is formed by the uneven transfer of the resin component from the spacer paper or the fatty acid sodium of the hydrolyzate, and the like. Patent Document 2 describes an effect that the spacer paper of the present invention is easily removed by washing with the water source.

[Patent Document 1] Japanese Laid-Open Patent Publication No. Hei 6-316432 (Patent Document 2)

However, the glass plate in which the spacer paper is inserted is stacked on the case of the case or the pallet, and is transported from the glass manufacturer to the manufacturer of the glass plate for processing and assembling the glass plate, and is used by the manufacturer of the glass plate. A take-out device called an UnPacker (robot or special machine) is taken out one by one from the box or pallet. At this time, the operation of adsorbing and taking out the glass plate by the glass adsorption portion of the unpacker and then taking out the spacer paper is repeated, and when the spacer paper is taken out, it is often held by the suction or clamping and taken out from the glass. The spacer paper of the portion of the edge of the board.

However, in the case where the spacer paper lacks toughness, the above-mentioned extended spacer paper may sag sometimes, and the unpacker may not hold the sagging portion well (the portion protruding from the edge of the glass sheet). . The glass sheets are sometimes stacked vertically in a vertical stack of boxes or pallets, sometimes flatly stacked on a flat stack of boxes or pallets, and in the case of vertical stacking, stacking glass sheets even when inserting paper When the layer is placed on the box or the pallet, the spacer paper extending from the upper side is drooped and then clamped into the laminated glass sheet, and the unpacker sometimes cannot hold the spacer paper well when the spacer paper is taken out. In particular, the glass substrate for FPD has a tendency to expand in size, and the size of the spacer paper must be equal to the size of the glass substrate for FPD. Therefore, for example, in the packaging of the glass substrate for FPD of the sixth generation, The size of the spacer paper used is about 1500 mm × 1800 mm. Thus, when the size of the spacer paper is increased, the frequency of occurrence of the failure of the unreceived spacer paper is increased due to the grip error of the spacer paper.

Moreover, when the above-mentioned extended spacer paper is held by adsorption, The attraction force of the spacer paper adsorption portion of the wrapping device passes through the spacer paper to reach the next spacer paper, which sometimes causes an abnormality in which two sheets of the spacer paper are simultaneously adsorbed. The abnormality can be dealt with by setting the attraction force when adsorbing the spacer paper to be small, but if the setting is too small, the spacer paper cannot be taken out, and if it is set larger, the two sheets of the spacer paper are simultaneously adsorbed as described above. The problem, therefore, in order not to cause problems, minor adjustments must be made.

Further, when the adhesion between the spacer paper and the glass plate is too strong, and the spacer paper is taken out from the case or the tray, an abnormality occurs in which the glass plate is adhered to the spacer paper and the glass plate is simultaneously taken out.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a spacer for a glass sheet and a laminate for a glass sheet, which can reliably hold a spacer paper extending from the edge of the glass sheet by a take-out device. Thereby, it is possible to take out only the spacer paper from the box or the pallet.

In order to achieve the above object, the present invention relates to a spacer for a glass sheet which is interposed between glass sheets and has a Gurley stiffness of 0.2 mN or more.

When the spacer paper is based on the lowering of the Gurley stiffness of JAPAN TAPPI No. 40 (hereinafter referred to as Gurley stiffness), that is, when the spacer paper lacks toughness, the spacer paper may sag and sometimes cannot be used. The grip portion of the suction or the grip of the device is taken out and the sagging portion (the portion protruding from the edge of the glass sheet) is satisfactorily gripped. Moreover, in the case of vertical stacking, when the glass sheet is laminated, if the spacer paper lacks toughness, the portion of the spacer paper protruding from the upper side of the glass sheet will sag, and the sagging portion is then laminated. The glass plate is clamped so that when the spacer paper is taken out, sometimes there is no The method is favorably held by taking out a grip portion such as suction or clamping of the device.

In order to prevent such a gap paper holding error caused by the operation at the time of taking out the spacer paper, the inventors of the present application confirmed from the experiment that the Gurley rigidity of the spacer paper must be 0.2 mN or more. Therefore, by setting the Gurley stiffness of the spacer paper to 0.2 mN or more, when the spacer paper is taken out, the gap paper holding error due to the operation can be prevented, and the self-glass plate can be reliably held by the take-out device. The spacer paper is extended from the edge so that the spacer paper can be taken out of the box or the pallet. Moreover, in the case of vertical stacking, when the glass is laminated, the spacer paper is not held by the laminated glass sheets, so that when the paper is taken out, the gap paper holding error due to the operation can be prevented. And by means of the take-up device, the spacer paper extending from the edge of the glass sheet is reliably held, so that the spacer paper can be taken out from the box or the tray.

In the spacer paper for glass sheets of the present invention, it is preferred that the smoothness of the spacer paper is 18 seconds or less.

Moreover, the inventors of the present application confirmed from the experiment that when the gap between the spacer paper and the glass sheet is too strong, when the spacer paper is taken out, the glass sheet is also taken out at the same time, and it is ascertained that: The above-mentioned abnormality occurs in the spacer paper having a smoothness (hereinafter referred to as smoothness) of JIS P8119 (1976) of more than 18 seconds, and if the smoothness is 18 seconds or less, the above-described abnormality does not occur. Therefore, it is possible to prevent the abnormality in the case where the above-mentioned spacer paper is taken out by using the spacer paper having a smoothness of 18 seconds or less as the spacer paper of the glass plate.

In the spacer paper for glass sheets of the present invention, it is preferred that the separator has a gas permeability of 5 seconds or more.

According to the experiment, the inventors of the present application confirmed the cause of the abnormality of the take-up device for adsorbing two sheets of the spacer paper at the time of the adsorption operation, and found out that the spacer paper was The above-mentioned abnormality occurs in the paper having a gas permeability (hereinafter referred to as air permeability) of JIS P8117 of less than 5 seconds, and if the air permeability is 5 seconds or more, the above abnormality does not occur. Therefore, the abnormality of the above-described take-out device can be prevented by using the spacer paper having a gas permeability of 5 seconds or more as the spacer paper of the glass plate.

Moreover, the present invention also provides a glass plate laminate in which at least two or more glass sheets are laminated, and the spacer is interposed between at least a part of the glass sheets to laminate a glass sheet.

Therefore, according to the glass plate laminate of the present invention, the spacer paper which protrudes from the edge of the glass plate is reliably held by the take-out means, so that only the spacer paper can be taken out from the case or the pallet.

When the spacer for a glass sheet of the present invention is used for a laminate of a glass sheet, the Gurley rigidity is 0.2 mN or more according to the glass sheet laminate, and therefore, the glass sheet is reliably held by the take-up device. Spacer paper so that the spacer paper can be removed from the box or pallet.

Hereinafter, preferred embodiments of the spacer paper for glass sheets and the glass sheet laminate of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a side view (schematic diagram) of a glass plate laminate showing an example of a packaged form in which a laminated glass sheet G is stored and/or conveyed.

The pallet 40 for packing as shown in FIG. 1 is provided by the base 42 and The inclined table 44 on the base 42 is formed, and a plurality of rectangular glass plates G are inclined to lean against the inclined surface of the inclined table 44, and a rectangular spacer paper 36 is interposed between the glass plates G. As long as the laminated glass sheets G can be stably loaded, stored, and transported, the inclination angle can be 85 degrees or less with respect to the level. In the present embodiment, the inclination angle of the inclined table 44 is 85 degrees to 70 degrees. In order to protect the glass sheet G, the size of the spacer paper 36 is preferably larger than the size of the glass sheet G. Therefore, one portion of the spacer paper 36 protrudes from the glass sheet G, and the projecting portion 36a of the spacer paper 36 is held by a unpacker (also referred to as a take-out device) not shown, and the spacer paper 36 is self-bundled. The bag is taken out with the pallet 40. Further, in the case where the glass sheet G is stacked vertically as in the case of the package tray 40, when the spacer paper 36 protrudes from the lower side of the glass sheet G, the glass sheet G cannot be loaded without a gap, thereby being bundled or At the time of conveyance, the glass sheet G may be damaged, and therefore the spacer paper 36 preferably protrudes only from the upper side and the left side. Further, the projecting portion 36a of the spacer paper held by the unpacker when the spacer paper 36 is taken out may be either the upper side portion or the left and right portions. The form of the pallet for binding is not limited to the form of the vertical stack of the present embodiment, and may be a flat stacked pallet or a form in which a plurality of glass sheets are stacked and stacked.

The spacer paper 36 of the embodiment has a Gurley stiffness of 0.2 mN or more. When the Gurley stiffness of the spacer paper 36 is low, that is, when the spacer paper 36 lacks toughness, the portion 36a extending from the edge portion of the glass sheet G may sag, and thus sometimes There is a case where the protruding portion 36a of the drooping spacer paper 36 cannot be reliably held by the unpacker. In order to prevent the operation failure of such a spacer paper 36, the inventors of the present application confirmed from the experiment that the Gurley rigidity of the spacer paper 36 must be 0.2 mN or more.

The size and thickness of the glass plate G and the spacer paper 36 are not limited, but particularly preferably the size of the paper corresponding to the size of the glass substrate for FPD of the sixth generation (for example, 1500 mm × 1800 mm), and the spacer paper. The thickness is from 0.01 mm to 0.2 mm. Further, the portion of the projecting portion 36a which protrudes from the glass sheet G (the length from the end side of the glass sheet G to the end side of the projecting portion 36a of the spacer paper 36) is particularly preferably 30 mm to 100 mm. .

Further, it is preferable that the smoothness of the spacer paper 36 is 18 seconds or less. When the adhesion between the glass sheet G and the spacer paper 36 is strong, when the spacer paper 36 is taken out by gripping, an abnormality in which the glass sheet G is taken out together is generated. In particular, in the case of a thin glass substrate for a plasma display (for example, 2.5 mm) or a glass substrate for liquid crystal (for example, 0.7 mm), the adhesion between the spacer paper 36 and the glass substrate is enhanced, so that when held, An abnormality in which the glass substrate is taken out together when the spacer paper 36 is taken out is more likely to occur. When the smoothness of the spacer paper 36 is 18 seconds or less, it is impossible to cause an abnormality in which the glass sheet G is taken out together when the spacer paper 36 is taken out while being gripped. Moreover, when the smoothness is 18 seconds or less, the spacer paper 36 has a rough surface, and the contact area with the glass plate G is reduced. Therefore, it is difficult to cause a problem that the resin component in the spacer paper 36 is transferred onto the glass sheet G to cause a pattern on the glass surface, burns, contamination, and the like.

The raw material of the spacer paper 36 may be waste paper, virgin pulp, or a mixture thereof. Further, a raw material containing cellulose or the like can also be used.

On the other hand, the inventors of the present application confirmed by experiment that the cause of the abnormality of the unpacker of the two sheets of the spacer paper 36 at the time of suctioning the spacer paper 36 by suction, and found out that: The gap 36 of less than 5 seconds will cause the above abnormality, and if the interval paper 36 has a gas permeability of 5 seconds On, the above exception will not occur. Therefore, when the spacer paper 36 is held by the unpacker in an adsorption manner, a spacer paper having a gas permeability of 5 seconds or more is preferable.

Further, in the present embodiment, it is preferable that the size of the foreign matter contained in the spacer paper 36 is 200 μm or less. When the size of the foreign matter is 200 μm or less, scratching of the glass sheet G is unlikely to occur, and the scratch of the glass sheet G is likely to occur during storage of the glass sheet G and during transportation. Further, the size of the foreign matter as the threshold varies depending on the thickness of the spacer paper 36 or the material of the glass sheet G. Therefore, the size of the foreign matter must be based on the material of the glass sheet G or the thickness of the spacer paper 36. And make the appropriate decision.

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

The present invention has been described with reference to the detailed and specific embodiments thereof, and it is obvious that various changes or modifications may be added without departing from the spirit and scope of the invention.

The present application is based on Japanese Patent Application No. 2007-182232, filed on Jul. 2011, the content of which is hereby incorporated by reference.

[Industrial availability]

The spacer paper for glass sheets of the present invention can be applied to storage and/or transport of glass sheets.

36‧‧‧ spacer paper

36a‧‧‧ Extension of the spacer paper

40‧‧‧Bag pallet

42‧‧‧Abutment

44‧‧‧ tilting table

Fig. 1 is a view showing a pallet of a form of a bundle of glass substrates for FPD; Side view.

36‧‧‧ spacer paper

36a‧‧‧ Extension of the spacer paper

40‧‧‧Bag pallet

42‧‧‧Abutment

44‧‧‧ tilting table

G‧‧‧glass plate

Claims (5)

A glass plate laminate obtained by laminating at least two or more glass plates obliquely and laminated, at least a part of the glass plates interspersed with spacer paper for glass plates, wherein the spacer paper is profitable The rigidity is 0.2 mN or more, and the material is waste paper, virgin pulp or a mixture of the above, and the spacer paper protrudes from either the upper side or the left side of the glass plate. The glass plate laminate according to claim 1, wherein the smoothness of the spacer paper is 18 seconds or less. The glass sheet laminate according to claim 1, wherein the spacer paper has a gas permeability of 5 seconds or longer. The glass sheet laminate according to claim 2, wherein the spacer paper has a gas permeability of 5 seconds or more. The glass sheet laminate according to any one of claims 1 to 4, wherein the spacer paper protrudes only from the upper side and the left side of the glass sheet.