CN106946453B

CN106946453B - Glass-sandwiched paper, glass sheet laminate and glass sheet package

Info

Publication number: CN106946453B
Application number: CN201610868277.5A
Authority: CN
Inventors: 布施裕儿; 若林沙枝
Original assignee: Asahi Glass Co Ltd
Current assignee: AGC Inc
Priority date: 2015-09-29
Filing date: 2016-09-29
Publication date: 2021-07-16
Anticipated expiration: 2036-09-29
Also published as: KR102601678B1; CN113562971A; CN106946453A; JP2017065803A; TWI797063B; TW201714846A; KR20170038170A; JP6671639B2

Abstract

Provided are a glassed paper, a glass plate laminate and a glass plate package body, wherein the occurrence of contamination due to foreign matter transferred from the glassed paper and defects such as wiring can be suppressed.

Description

Glass-sandwiched paper, glass sheet laminate and glass sheet package

Technical Field

The invention relates to a glass-sandwiched paper, a glass sheet laminate and a glass sheet package.

Background

Glass sheets for FPD (Flat Panel Display) such as architectural glass sheets, automotive glass sheets, plasma Display glass sheets, and liquid crystal Display glass sheets sometimes have product defects such as flaws formed on the surfaces during storage and transportation and contamination of the surfaces due to contaminants in the atmosphere.

In particular, since a glass plate (glass substrate) for an FPD has elements such as fine electric wiring (hereinafter, also referred to as wiring), electrodes, electric circuits, and partition walls formed on the surface thereof, even if the surface has some flaws or stains, the glass plate may cause defects such as disconnection. Therefore, glass sheets used for these applications are required to have high surface cleanliness.

Generally, glass sheets are stored and transported in a state of being stacked on a pallet for packaging or the like.

At this time, so-called glassine paper is interposed between the glass sheets, whereby the surfaces of the adjacent glass sheets are separated from each other, and the surface of the glass sheets is prevented from being contaminated by flaws or contaminants in the atmosphere.

However, in the method of sandwiching the glassine paper between the glass plates, the glassine paper is in direct contact with the surfaces of the glass plates. Therefore, various components (foreign substances) such as resin present on the surface of the glassine paper are transferred to the surface of the glass plate. When using a glassed paper having a large amount of foreign matter on the surface, problems such as paper surface patterns, burns, and stains are likely to occur in the glass sheet. Further, the glass plate is a cause of defects such as breakage of fine wiring formed on the surface of the glass plate. Such foreign matter is difficult to completely remove from the surface of the glass plate even when the glass plate is cleaned.

As a method for solving the above-described problems, for example, patent document 1 discloses a glass sheet package in which a glass sheet is packaged using a glass-filled paper having a higher saturated fatty acid content of 0.08 mass% or less.

Further, patent document 2 discloses a glassine paper having a content of an organic compound containing a silicon element of 3ppm or less.

[ Prior Art document ]

[ patent document ]

[ patent document 1] International publication No. 2011/118502

[ patent document 2] International publication No. 2014/098162

[ problem to be solved by the invention ]

In

patent documents

1 and 2, the content of foreign matter contained in the glassine paper is reduced, whereby the occurrence of a stain on the surface of the glass sheet and the occurrence of a defect such as a disconnection of wiring formed on the surface of the glass sheet can be suppressed.

However, simply reducing the content of foreign matter in the glassed paper may not sufficiently suppress the occurrence of defects such as disconnection of wiring formed on the surface of the glass plate.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and provides a glassed paper, a glassed sheet laminate using the glassed paper, and a glassed sheet package, which can sufficiently suppress the occurrence of contamination due to foreign matter transferred from the glassed paper, and defects such as wiring.

[ MEANS FOR solving PROBLEMS ] A method for solving the problems

The number of the glassine papers of one embodiment of the present invention was counted by the following measurement methodThe number of white foreign matters having a size of 50 μm or less was 10/269 m²The following.

[ measurement method ]

(A) Glass interleaf paper was pressed against a glass plate for evaluation (thickness 0.7mm and size 370mm × 470 mm) (number of times: 100, time: 4 sec/time, pressure: 0.45MPa, temperature of glass plate for evaluation: 55 ℃), and (B) while conveying the glass plate for evaluation (linear velocity 200cm/min) having finished pressing, pure water (flow rate: 57L/min) was supplied, the glass plate for evaluation was cleaned by arranging 2 roller brushes (roller diameter (inner diameter): 60mm, roller diameter (outer diameter): 80mm, brush diameter: 0.06 mm/close winding, material: nylon 612, rotation speed: 300rpm, distance: upper and lower 0mm) on the upper side and 2 total 4 roller brushes (roller diameter (inner diameter): 60mm, roller diameter (outer diameter): 80mm, brush diameter: 0.06 mm/close winding), and (C) an off-line defect inspection system (model FPI-6000 (model: FPI6090D)) manufactured by aobao scientific corporation was used, inspecting all foreign matters in the cleaned glass plate for evaluation to obtain an image of all foreign matters, and (D) visually observing all the foreign matters based on the image to count the number of white foreign matters having a size of 50 μm or less from among the all the foreign matters.

Preferably, the number of white foreign matters having a size of 50 μm or less in the glassine paper counted by the above-mentioned measuring method is 6/269 m²The following.

Preferably, the number of white foreign matters having a size of 50 μm or less in the glassine paper counted by the above-mentioned measuring method is 3/269 m²The following.

Preferably, in the glassine paper, the paper is used in accordance with JIS P8224: the content of the organic matter measured in 2002 is 0.08% by mass or less.

Another aspect of the present invention is a glass sheet laminate formed by alternately laminating the above-described glassed paper and glass sheets.

A glass plate package according to another aspect of the present invention includes the glass plate laminate and a pallet on which the glass plate laminate is placed.

Preferably, the pallet is a pallet on which the glass sheet laminate is placed in a flat stacked state.

[ Effect of the invention ]

According to the present invention, it is possible to suppress the occurrence of contamination due to foreign matter transferred from a glassed paper, and defects such as wiring.

Drawings

Fig. 1(a) to (D) are overall configuration diagrams of the measurement apparatus.

Fig. 2(a) to (D) are explanatory diagrams sequentially showing the sheet jam feeding operation and the pressing operation by the pressing device and the sheet jam feeding device.

Fig. 3(a) and (B) are explanatory views showing a state in which the glass plate for evaluation passes through the cleaning apparatus.

Fig. 4(a) to (F) are images obtained by the defect inspection apparatus.

FIG. 5 is a schematic configuration diagram of a paper machine for producing a glassine paper.

Fig. 6 is a conceptual diagram showing an example of the glass plate package.

[ Mark Specification ]

10 measurement device 10 …, 12 … pressing device, 14 … cleaning device, 16 … defect inspection device, 18 … display device, 20 … lower platform, 22 … upper platform, 24 … cylinder device, 26 … adsorption pad, 28 … glass plate for evaluation, 30 … adsorption pad, 32 … glass plate, 34 … paper clamping and feeding device, 36 … glass paper clamping, 38 … cylinder body, 40 … piston, 42 … paper clamping roller, 44 … winding shaft, 46 … rotation support part, 48 … winding part, 50 … tensioning roller, 52 … tensioning roller, 54 … winding shaft, 56 … motor, 58 … nozzle, 60 … upper side first roller brush, 62 … upper side second roller brush, 64 … lower side first roller brush, 66 … lower side second roller brush, 250 … glass plate package, 36252, 254 oblique table …, 36258 glass plate 72, … glass plate clamping table, … glass plate loading table, … glass plate package

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The present invention will be described in the following preferred embodiments. Many modifications may be made without departing from the scope of the present invention, and other embodiments than the present embodiment may be utilized. Accordingly, all modifications within the scope of the present invention are included in the scope of the claims.

In the drawings, the same elements having the same functions are denoted by the same reference numerals. In the present specification, when a numerical range is expressed by "to", the numerical values of the upper limit and the lower limit expressed by "to" are also included in the numerical range.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As described above, in order to suppress the transfer of foreign matter from the glassed paper to the glass plate, which results in the contamination of the surface of the glass plate, the disconnection of the wiring formed on the surface of the glass plate, and other defects, the content of foreign matter in the glassed paper has been conventionally reduced.

However, according to the studies of the present inventors, in a glass plate in which elements such as wirings and electrodes are formed on the surface of a glass plate for an FPD or the like, even if a small number of foreign substances, which have not been problematic in the past, are sandwiched between sheets of glass, the defects such as wirings are generated with an absolutely low probability due to recent upsizing and high definition of a display. Therefore, further studies have found that, by reducing the number of specific foreign matters of 50 μm or less, defects such as disconnection of the wiring can be suppressed, and the present invention has been completed.

(glassine paper)

As the glassine used in the present embodiment, chemical pulp such as Kraft Pulp (KP), Sulfite Pulp (SP), and soda pulp (AP); semichemical pulp (SCP), chemical ground wood pulp (CGP), and the like; mechanical pulp such as ground wood pulp (GP), thermomechanical pulp (TMP, BCTMP), refined ground wood pulp (RGP); non-wood fiber paper pulp taking papermulberry, common burs, hemp, kenaf and the like as raw materials; synthetic pulp and other various raw materials. The glassine paper of the present invention may be produced from a mixture of these materials, or may be produced from a material containing cellulose or the like.

In addition, the raw materials can be waste paper, Virgin pulp (Virgin pulp) or a mixture of the waste paper and the Virgin pulp. Among them, virgin pulp is preferable.

In the glassine paper of the present embodiment, it is preferable to use, as a raw material, any pulp produced without using a silicon-based defoaming agent (silicon-containing defoaming agent) which causes a large problem such as wiring or electrode failure when transferring the pulp onto a glass plate.

Among them, pulp produced without using an antifoaming agent containing polydimethylsiloxane is particularly preferably used as a raw material of the glassine paper of the present embodiment.

Further, the glassine paper was prepared in accordance with JIS P8224: 2002 is preferably 0.08% by mass or less. The lower limit of the organic matter content is not particularly limited, but is, for example, 0.001 mass% or more. By setting the content of the organic matter to 0.08 mass% or less, transfer of the organic matter from the glass interleaf paper to the glass plate can be suppressed.

(measurement method)

Next, a method of measuring foreign matter in the glassine paper will be described. Fig. 1 shows an overall configuration diagram of a measurement device 10 according to an embodiment.

Fig. 1(a) shows the pressing device 12, fig. 1(B) shows the cleaning device 14, fig. 1(C) shows the defect inspection device 16, and fig. 1(D) shows the display device 18.

The pressing device 12 is composed of a lower platen 20, an upper platen 22, and a cylinder device 24. A plate-shaped suction pad 26 is attached to the upper surface of the lower table 20, and a rectangular evaluation glass plate 28 to be inspected is detachably sucked and held on the horizontal upper surface of the suction pad 26. Here, the glass plate 28 for evaluation had a thickness of 0.7mm and a size of 370 mm. times.470 mm.

As the glass plate 28 for evaluation, a glass plate for FPD such as a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), an organic Electroluminescence (EL) display, and the like is exemplified, but not limited thereto, and a flat glass plate including a glass plate for building, a glass plate for vehicle, and the like may be cited.

The upper stage 22 is disposed to face the lower stage 20 in the vertical direction. The upper surface plate 22 is fixed to a frame, not shown. A plate-shaped suction pad 30 is attached to the lower surface of the upper surface plate 22, and a dummy glass plate 32 is detachably suction-held on the horizontal lower surface of the suction pad 30.

A strip-shaped glass interleaving paper 36 unwound from an interleaving paper supply device (see fig. 2)34 described later is inserted in the gap between the evaluation glass plate 28 and the dummy glass plate 32 in parallel with the surfaces of the evaluation glass plate 28 and the dummy glass plate 32.

The cylinder device 24 is a fluid cylinder that raises and lowers the lower deck 20, and a cylinder body 38 is fixed to a not-shown table frame, and an upper end portion of a piston 40 that extends and contracts with respect to the cylinder body 38 is fixed to a lower surface of the lower deck 20.

Therefore, when the piston 40 extends, the lower surface plate 20 is raised, and the evaluation glass plate 28 is brought into contact with the glassed paper 36 positioned above the lower surface plate 20. The glassed paper 36 is lifted upward (in a direction approaching the dummy glass plate 32) by the continuous upward movement of the lower surface plate 20, and then is nipped and pressed by the evaluation glass plate 28 and the dummy glass plate 32. Thereby, the evaluation glass plate 28 and the glassine paper 36 are pressed. When pressed, the cellophane 36 is supported by the upper platen 22 via the glass plate 32. Further, the form of the glass sheet laminate (fig. 6) laminated via the paper sandwiching in the package (fig. 6) is reproduced by sandwiching the glass sheet 36 between the evaluation glass sheet 28 and the dummy glass sheet 32. Then, the evaluation glass plate 28 is pressed against the glassed paper 36 by a predetermined pressing force, whereby the load at the time of actual transportation can be reproduced. When the piston 40 is caused to perform the contraction operation, the lower surface plate 20 is lowered in a direction in which the pressing force is removed.

In the embodiment, the lower surface plate 20 is moved up and down, but the present invention is not limited thereto, and the lower surface plate 20 and the upper surface plate 22 may be moved up and down relatively.

Fig. 2 is an explanatory diagram showing a pressing operation and a sheet jam feeding operation by the pressing device 12 and the sheet jam feeding device 34 in succession.

When glass sheets for FPDs are actually packaged and transported, the glassed paper is generally used in a state where a glassed paper supplied in a roll form from a paper mill or the like is cut into a desired size and shape (a rectangular shape substantially similar to a glass sheet to be packaged). In the measuring apparatus 10 of the embodiment, a strip-shaped cellophane 36 is used in a state of being unwound from a roll before cutting.

The paper jam feeding device 34 includes: a rotation support portion 46 that rotatably supports the pinch roller 42 wound in a roll shape around the winding shaft 44; and a winding unit 48 that winds the band-like glassine paper 36 from the paper nipping roller 42.

As shown in fig. 2(a), the leading end portion of the cellophane 36 is fixed to the spool 54. At this time, the lower surface plate 20 is located at a pressing removal position retracted downward from the pressing position.

In the initial setting before the evaluation is started, the glassine paper 36 is unwound from the paper-nipping roller 42 in the direction of arrow a, wound around the tension roller 50, and inserted into the gap between the lower platen 20 and the upper platen 22. The cellophane 36 is wound around the tension roller 52, and the leading end portion of the cellophane 36 is fixed to the spool 54 of the winding unit 48. The spool 54 is rotated in the same direction as the direction (arrow a direction) in which the glassed paper 36 is unwound from the paper feed roller 42, with power of the motor 56 transmitted thereto. Thus, the glassine paper 36 is taken up by the reel 54.

Next, as shown in fig. 2(B), the piston 40 of the cylinder device 24 is extended, the lower surface plate 20 is raised in the direction of arrow B pressing the evaluation glass plate 28 and the glassed paper 36, and the surface of the evaluation glass plate 28 is pressed against the glassed paper 36. The conditions at this time were a time of 4 seconds/time, a pressure of 0.45MPa, and a temperature of the glass plate 28 for evaluation of 55 ℃.

Next, as shown in fig. 2(C), the piston 40 of the cylinder device 24 is contracted, and the lower surface plate 20 is positioned at a pressing removal position where it is retracted downward from the pressing position. Then, 1 tensor of the glassine paper 36 is unwound from the paper nipping roller 42 by the paper nipping and supplying device 34.

Although not shown in fig. 2, the control device is provided to intermittently drive the control cylinder device 24 and the electric motor 56. The control device controls to alternately perform the intermittent pressing/pressing releasing operation by the cylinder device 24 as indicated by arrow B, C and the intermittent sheet-nipping and winding operation by 1 tensor of the motor 56 as indicated by arrow a plurality of times. That is, the control device intermittently drives and controls the cylinder device 24 and the motor 56 so as to alternately perform the sheet clamping and feeding process by the sheet clamping and feeding device 34 and the pressing process by the cylinder device 24 a plurality of times with respect to the evaluation glass plate 28.

The 1-tensor sheet-sandwiching winding operation of the glassine paper 36 is an operation of winding 1 tensor sheet of glassine paper 36 used when packaging and conveying the glass sheet 28 for evaluation, assuming that the size of the glassine paper 36 is 1 tensor. Thereby, the evaluation glass plate 28 is always pressed against the new glassed paper 36. The sheet nipping roller 42 repeats the sheet nipping and winding operation a plurality of times, and thus foreign matter information of the large-area sheet nipping roller 42 can be collected in 1 evaluation glass plate 28.

In fig. 2(D), the above operation is repeated 100 times.

Although the paper jam winding operation of the entire length of the paper jam roller 42 can be repeated, the time required for collecting the foreign matter information on the 1 evaluation glass plate 28 becomes long. In consideration of the foreign matter information and the time collected in the evaluation glass plate 28, in the present embodiment, 100 times of the sheet-clamping winding operation, that is, 100 tenses of the foreign matter information of the glass-clamping sheet 36 is collected in the evaluation glass plate 28.

In the case where the cellophane 36 cut to the same size as the evaluation glass plate 28 is used in the pressing device 12 of the embodiment, the cellophane 36 may be bonded to the lower surface of the dummy glass plate 32 of the upper stage 22. Thus, the cellophane 36 is supported by the upper platen 22 via the dummy glass plate 32.

The cleaning device 14 shown in fig. 1(B) cleans the surface of the evaluation glass plate 28 pressed against the glassed paper 36 by the pressing device 12, and removes foreign matter adhering (transferred) to the surface of the evaluation glass plate 28 from the glassed paper 36.

In the cleaning apparatus 14, while the glass plate 28 for evaluation was conveyed at a linear velocity of 200cm/min, pure water was supplied from the nozzle 58 at a flow rate of 57L/min, and the glass plate 28 for evaluation was cleaned at a rotation speed of 300rpm (the same direction as the conveying direction of the glass plate 28 for evaluation) by the upper first roller brush 60, the upper second roller brush 62, the lower first roller brush 64, and the lower second roller brush 66. Foreign matter that is difficult to remove by cleaning cannot be removed and remains on the surface of the evaluation glass plate 28.

In the embodiment, the glass plate evaluation apparatus includes an upper first roller brush 60 and an upper second roller brush 62 disposed above the evaluation glass plate 28, and a lower first roller brush 64 and a lower second roller brush 66 disposed below the evaluation glass plate 28. Further, a nozzle 58 for spraying pure water to the surface of the evaluation glass plate 28 is provided.

The upper first roller brush 60, the upper second roller brush 62, the lower first roller brush 64, and the lower second roller brush 66 rotate in contact with the surface of the evaluation glass plate 28.

The upper first roller brush 60, the upper second roller brush 62, the lower first roller brush 64, and the lower second roller brush 66 are all the same roller brush. The roller brush was a tightly wound roller brush having a roller diameter (inner diameter) of 60mm, a roller diameter (outer diameter) of 80mm, and a brush diameter of 0.06 mm. The bristles of the roller brush are comprised of nylon 612. The close winding is a case where a flocked disk brush (channel brush) is wound around a roller without a gap.

As shown in fig. 3(a), the distance L1 between the upper first roller brush 60 and the upper second roller brush 62 was 200 mm. Further, the distance L2 between the upper first roller brush 60 and the lower first roller brush 64 was 50 mm.

As shown in fig. 3(a), the upper first roller brush 60 and the lower first roller brush 64 are disposed at positions where the respective bristles contact, that is, at positions 0mm above and below, before the evaluation glass plate 28 passes through. Similarly, the upper second roller brush 62 and the lower second roller brush 66 are disposed at positions where the respective bristles contact, that is, at positions 0mm above and below.

According to the cleaning device 14, while the evaluation glass plate 28 is conveyed in the direction of the arrow D, pure water is supplied from the nozzle 58 to the surface of the evaluation glass plate 28, and the upper first roller brush 60, the upper second roller brush 62, the lower first roller brush 64, and the lower second roller brush 66 are rotated in the same direction as the conveying direction of the evaluation glass plate 28, thereby cleaning the surface of the evaluation glass plate 28.

As shown in fig. 3(a), the distance between the upper first roller brush 60 and the lower first roller brush 64 and the distance between the upper second roller brush 62 and the lower second roller brush 66 are set to be 0mm vertically. Therefore, as shown in fig. 3(B), when the evaluation glass plate 28 passes between the upper first roller brush 60 and the lower first roller brush 64 and between the upper second roller brush 62 and the lower second roller brush 66, the upper first roller brush 60, the upper second roller brush 62, the lower first roller brush 64, and the lower second roller brush 66 are pressed against the evaluation glass plate 28 with a pressure equivalent to the thickness of the evaluation glass plate 28.

Foreign matter that can be removed by cleaning, such as dust and paper dust from the cellophane 36, and foreign matter that is difficult to remove by cleaning adhere to the surface of the evaluation glass plate 28 that has passed through the pressing step by the pressing device 12. The objects to be evaluated of the glassine paper 36 and the glass plate for evaluation 28 are foreign substances present on the surface of the glass plate for evaluation 28 and difficult to remove by washing. In the cleaning step by the cleaning device 14, therefore, foreign matter that can be removed by cleaning is removed from the evaluation glass plate 28, and foreign matter that is difficult to remove by cleaning remains on the glass plate.

As shown in fig. 1C, the cleaned evaluation glass plate 28 was transported to a defect inspection apparatus 16 (model number FPI6090D, an off-line defect inspection system FPI-6000 series by aobao technologies), the defect inspection apparatus 16 inspected foreign substances on the surface of the cleaned evaluation glass plate 28, and the defect inspection apparatus 16 inspected the foreign substances present on the surface of the evaluation glass plate 28, which were difficult to remove by cleaning, by a light transmission method, and acquired an image of all the foreign substances.

Next, as shown in fig. 1(D), an image 80 acquired by the defect inspection apparatus 16 is displayed on the display apparatus 18. All foreign matters were visually observed based on the image 80. The number of white foreign matters having a size of 50 μm or less was counted from all the foreign matters. The lower limit of the size of the white foreign matter is not particularly limited, but is, for example, 0.1 μm or more.

Next, a method of measuring the number of white foreign substances will be described.

The cleaned evaluation glass plate 28 was inspected for all foreign matters using an off-line defect inspection system (FPI-6000 series (model: FPI6090D)) manufactured by aobao technologies as the defect inspection apparatus 16, and an image of all foreign matters was acquired.

The conditions when using an off-line defect inspection system are as follows.

The sensitivity was set to the high sensitivity mode (2 μm), and the non-measurement region was set to 10mm from the end. Also, the lamp illuminance was set to "30" instead of "66" in the standard sensitivity mode (4 μm). I.e. the lamp illumination is reduced compared to the standard sensitivity mode.

On the other hand, regarding the setting (threshold value) on the light receiving element side, the threshold value effective for the dark portion is set to "30" instead of "15" of the standard sensitivity mode. That is, since the threshold is increased, a brighter portion is detected as compared with the standard sensitivity mode.

The threshold effective for the bright portion is set to "10" similarly to "10" in the standard sensitivity mode.

The entire defect image is automatically saved in the defect inspection device 16.

Finally, the image 80 obtained by the defect inspection apparatus 16 is displayed on the display device 18, and all the foreign matters are visually observed based on the image 80, and the number of white foreign matters of 50 μm or less is counted from among all the foreign matters.

The "visual appearance observation by eye" herein includes, in different order: a behavior of a foreign matter of 50 μm or less with reference to a scale given to the image 80 obtained by the defect inspection apparatus 16 and a longitudinal direction; and the behavior of a white foreign substance is exemplified from among the kinds of a plurality of foreign substances shown below.

Next, the types of all foreign matters in the evaluation glass plate 28 obtained by the defect inspection apparatus 16 will be described. Fig. 4 is an image of a foreign object obtained by the defect inspection device 16 after the glassine paper 36 is pressed 100 times against the evaluation glass plate 28 and cleaned by the cleaning device 14. The inventors have found that there are some types of foreign matter when studying the foreign matter based on the image acquired by the defect inspection apparatus 16.

Fig. 4 a shows black foreign matter (black/small) having a size of 50 μm or less. Fig. 4(B) shows a black foreign substance having a size larger than 50 μm ((black/large) — fig. 4(C) shows a white foreign substance having a size of 50 μm or less (white/small) — fig. 4(D) shows a white foreign substance having a size larger than 50 μm (white/large) — fig. 4(E) shows an aggregate (dense) of a plurality of foreign substances fig. 4(a) to (E) show a foreign substance (other) not included in the foreign substances of fig. 4(a) to (E).

Here, the white foreign matter (white foreign matter) is a foreign matter having a portion where a color contrast can be confirmed between the outer peripheral portion (outline portion) of the foreign matter and the interior of the foreign matter in the image captured under the defect inspection condition as shown in fig. 4.

In addition, when an aggregate of a plurality of foreign objects exists in one image, the size of the aggregate is determined based on the longitudinal direction of the aggregate as one foreign object.

The sizes of the foreign matters are classified into those of 50 μm or less and those larger than 50 μm based on the longitudinal direction.

For example, when the number of all the foreign matters is counted for 2 different types of cellophanes, the total number of the foreign matters is substantially the same, but the number of white foreign matters having a size of 50 μm or less in one cellophane may be smaller than the number of white foreign matters having a size of 50 μm or less in the other cellophane.

In addition, even if the total number of foreign matters in one of the two different types of glassed paper is smaller than that of the other glassed paper, the number of white foreign matters having a size of 50 μm or less may be larger than that of the other glassed paper. The lower limit of the number of white foreign substances is not particularly limited, but is, for example, 1/269 m²The above.

That is, the number of white foreign matters having a size of 50 μm or less among the total number of foreign matters differs among the cellophanes. The inventors paid attention to the number of white foreign matters having a size of 50 μm or less, not the total number of foreign matters, and found that a glassed paper having a small number of white foreign matters having a size of 50 μm or less can suppress the occurrence of defects such as breakage of a glass sheet. The results are described in the examples below.

When white foreign matter is analyzed, so-called artificial organic matter such as PET (polyethylene terephthalate), nylon, and EVA (ethylene-vinyl acetate copolymer resin) is mainly used. The artificial organic matter is considered to be incorporated when the resin member comes into contact with the paper raw material liquid or the wet paper, for example, when the paper raw material liquid passes through a plastic wire used in the wire part, or when the wet paper is mechanically squeezed and dewatered by a plurality of sets of rolls and felts in the pressing part.

As a result of extensive studies, the inventors have found that, particularly, the generation of white foreign matter is largely influenced by a contact member called canvas.

(method for producing glassine paper)

Fig. 5 is a schematic configuration diagram of a paper machine 100 for producing a glassine paper.

As shown in fig. 5, the raw material liquid for glassine (liquid obtained by diluting pulp with water) is fed from the head box 112 in a sheet-like manner onto the lower wire 116 provided in the wire section 114. The paper material liquid supplied to the lower wire 116 is then sandwiched between the lower wire 116 and the upper wire 118, and thereby spread to a uniform thickness and dewatered to become a wet paper (paper).

The lower and

upper screens

116 and 118 of the screen section 114 are permeable membranes formed in an endless belt shape. Specifically, the endless belt is made of a net made of a plastic or metal material, or a felt made of natural fibers or synthetic fibers.

The lower wire 116 and the upper wire 118 are hung on a plurality of rollers, and a driving force of a motor, not shown, is transmitted to a driving roller among the plurality of rollers, thereby moving around at a predetermined speed.

The wet paper web formed by the wire part 114 is conveyed to the press part 120 having the press roll, endless felt, and the pair of press rolls, etc., and is further dewatered and pressed at the same time.

The wet paper having passed through the pressing portion 120 is conveyed to the drying portion 124 formed of a plurality of rolls, and is dried in an atmosphere of, for example, about 120 ℃.

When the wet paper is conveyed at a high speed while passing through the drying section 124,there is a possibility that the paper runs out, and therefore an auxiliary member called canvas is conveyed in a state of being in contact with the wet paper. In order to obtain a glass plate with less white foreign matter as in the present embodiment, it is preferable to perform the following process. That is, the canvas is made of a material not using so-called artificial organic materials such as PET (polyethylene terephthalate), nylon, EVA (ethylene vinyl acetate copolymer resin) and the like, or the canvas is replaced before it is deteriorated by use, or cellulose or SiO is used₂And the surface of the canvas is coated with a material that does not become a white foreign matter.

The paper dried by the drying section 124 is conveyed to the calender section 126, and is subjected to a calendering process by nip conveyance by calender rolls or the like, thereby smoothing the front and back surfaces. If necessary, an application section may be provided between the drying section 124 and the calender section 126 to apply a coating material or the like to the surface of the smoothed paper.

The paper calendered by the calender unit 126 is wound up as a glassine paper by a reel 128 and formed into a roll shape (hereinafter, referred to as a large roll 130).

The glassine paper to be the large roll 130 is generally cut into a width corresponding to a product, for example, and wound up to be a glassine paper winding roll 42 on which a long glassine paper having a predetermined length of about 8000 to 10000m is wound. That is, typically, the glassine paper is subdivided from the large roll 130.

The glassine paper is fed from the large roll 130, cut into a predetermined width (cut in the longitudinal direction) by a cutter 134, and wound by a winder 136. The glassed paper fed from the large roll 130 is cut into a predetermined length (cut in the width direction) by a cutter 134 at a timing when the length reaches a predetermined length, and is formed into a glassed paper nipping roll 42 in which a long glassed paper is wound in a predetermined width.

The long nipped glass sheets wound around the nipping roller 42 are cut into a cut piece shape (rectangular shape) having a size corresponding to the stacked glass plates, and are sandwiched between the stacked glass plates.

In the glassine paper machine 100 (paper making process), when preparing the paper stock solution to be supplied to the headbox 112, it is preferable to use pulp with less white foreign matter as the pulp sheet to be the stock.

For example, the number of white foreign matters in the pulp sheet is counted by the same method as the above-described measurement method for the glassine paper. By selecting the pulp pieces based on the number of white foreign matters, it is possible to use the pulp pieces with less white foreign matters.

In the process of producing a pulp sheet, artificial organic matter may adhere to the pulp sheet when the pulp sheet comes into contact with a resin member. Further, there is a problem that artificial organics of the pulp sheet are mixed into the glassine paper. The content of the artificial organic matter in the pulp sheet is preferably 0.08 mass% or less. By setting the content of the artificial organic matter to 0.08 mass% or less, the artificial organic matter mixed into the glassine paper can be reduced. Here, the artificial organic material is a material conforming to JIS P8224: 2002, and the resin content in the pulp sheet.

The use of pulp with less white foreign matter is suitable for producing glassine paper with less white foreign matter.

When the number of white foreign matters is counted by using the pulp sheet, the number of white foreign matters having a size of 50 μm or less is preferably 200/m²The following.

In order to reduce the mixing of organic substances in the paper making step, it is preferable to remove resin burrs of the resin member used in the paper making step and in contact with the paper stock solution, the wet paper, or the like. The resin burrs are easily detached and easily mixed into the paper stock solution, the wet paper, or the like, and therefore, it is effective to remove the resin burrs.

Before the paper is made, it is preferable to perform weak alkali cleaning or weak acid cleaning in all of piping and steps. This is to suppress the mixing of organic substances generated when a new glassine paper is manufactured and other glassine papers are made.

If such thorough control, which has not been conventionally performed, is not performed, it is difficult to manufacture the glassine paper with less white foreign matter.

(glass plate package)

The glass plate package of the present embodiment includes: a glass plate laminated body formed by alternately laminating glass-sandwiched paper and glass plates; and a pallet on which the glass plate laminate is placed.

Fig. 6 conceptually shows an example of the glass plate package. Fig. 6 is a view (side view) of the glass plate package as viewed from the side of the glass.

The glass plate package 250 shown in fig. 6 includes: a glass sheet laminate 262 in which glass sheets G and a glass paper 260 are alternately laminated; and a pallet 252 on which the glass plate laminate 262 is placed.

The pallet 252 is a well-known pallet for packaging glass plates, and includes a base 254, an inclined table 256 standing on the upper surface of the base 254, and a mounting table 258 mounted on the upper surface of the base 254.

One horizontal surface (a contact surface with the glass sheet G, i.e., a back surface) of the tilting table 256 is tilted with respect to the vertical direction (hereinafter, also referred to as a tilted surface). The angle of the inclined surface is only required to be an angle at which the stacked glass sheets G can be stably loaded, stored, and transported, and is usually 85 ° or less, for example, preferably 85 ° to 70 ° with respect to the horizontal direction.

The upper surface of the table 258 is inclined downward toward the inclined table 256 with respect to the horizontal direction. In the illustrated example, the upper surface of the mounting table 258 is, for example, 90 ° with respect to the inclined surface of the inclined table 256.

In the pallet 252, the glass sheets G are stacked in a state of being placed on the upper surface of the mounting table 258 and being in contact with the inclined surface of the inclined table 256.

Further, the glassine paper 260 according to the present embodiment is interposed between the glass sheets G. The glassine paper 260 is larger in size than the glass sheets G and is interposed between the glass sheets G so as to cover the entire surfaces of the glass sheets G. The size of the glass plate G is preferably 2200mm × 1800mm or more. When the size of the glass plate is large, the occurrence rate of defects such as disconnection of wiring increases, and therefore the glassed paper of the present embodiment can be suitably applied. Further, the size of the glass plate G is preferably 2400mm × 2100 mm. The size of the glassine paper is preferably the same as or larger than the size of the glassine paper, and particularly, the length and width of the glassine paper are both larger than 20 mm.

Note that, a glassine paper 260 may be similarly interposed between the laminated glass sheets G and the inclined table 256, and the surface of the foremost glass sheet G may be similarly covered with the glassine paper 260.

As described above, the glass plate package 250 is formed. In this case, if necessary, the abutting plate may be brought into contact with the foremost glass plate G (glassed paper), a band-like body may be hung and fixed on the inclined table 256, and a cover may be hung to cover the entire glass plate G.

The glass sheet package of the present invention is not limited to the structure in which the glass sheets G are stacked obliquely (so-called longitudinal stacking) as in the glass sheet package 250 shown in fig. 6. The glass plate package may be configured by using a pallet capable of horizontally stacking (so-called flat stacking) glass plates G, such as a plate-like body storage container shown in japanese utility model registration No. 3165973.

In the case of the flat stacking, since the load acting on the glass plate and the glassed paper near the bottom is increased, foreign matter is easily transferred from the glassed paper to the glass plate, and a large number of sheets cannot be loaded. Specifically, even in a load per unit area of 30g/cm²Even when the glassine paper is pressed against the glass plate by the above surface pressure, foreign matter transferred from the glassine paper can be suppressed.

In the glass plate package of the present embodiment, various known glass plates are exemplified as the glass plate G. Among them, a glass plate having elements such as the above-described wiring and electrodes formed on the surface thereof is preferable, and a glass plate for an FPD is particularly preferable.

Although the glassed paper, the glass sheet laminate, and the glass sheet package have been described in detail above, the present invention is not limited to the above-described examples, and various improvements and modifications can be made without departing from the scope of the present invention.

[ examples ] A method for producing a compound

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples at all.

[ example 1]

A typical glassine paper machine shown in fig. 5 was used to manufacture glassine paper using virgin pulp (pulp sheet) as a raw material. As the raw material, those conforming to JIS P8224: 2002 is 0.08% by mass or less of an organic matter and 0.14 pieces/m of white foreign matter are visually observed²The following pulp sheets.

The glassine paper produced from the pulp sheet was (A) pressed against a glass plate for evaluation (having a thickness of 0.7mm and a size of 370 mm. times.470 mm) (number of times: 100, time: 4 seconds/time, pressure: 0.45MPa, glass plate temperature for evaluation: 55 ℃), and (B) while conveying the glass plate for evaluation having finished being pressed (linear speed: 200cm/min), pure water (flow: 57L/min) was supplied, the glass plate for evaluation was cleaned by arranging 2 brushes (roll diameter (inner diameter): 60mm, roll diameter (outer diameter): 80mm, brush diameter: 0.06 mm/tight winding, material: nylon 612, rotation speed: 300rpm, distance: 0mm, up and down) on the upper side and the lower side, and (C) the glassine paper was cleaned by using a defect inspection system (FPI-6000 series (FPI: FPI6090D)) produced by Oubao technology, inspecting all foreign matters in the cleaned glass plate for evaluation to obtain images of all foreign matters, and (D) observing all foreign matters visually based on the images to count the number of white foreign matters with a size of 50 μm or less from the total foreign matters, wherein the total number of foreign matters in the glassed paper is 32/269 m²The number of white foreign matter particles having a size of 50 μm or less was 10/269 m²。

[ example 2]

Except that the raw materials used were those in accordance with JIS P8224: 2002 is 0.05% by mass or less and 0.1 piece/m of white foreign matter is observed by visual observation²Glassine paper was produced in the same manner as in example 1, except for the following pulp sheets.

When the number of white foreign matters with a size of 50 μm or less among all the foreign matters is counted, the total number of the foreign matters is 25/269 m²The number of white foreign matters having a size of 50 μm or less was 6/269 m²。

[ example 3]

Except that the raw materials used were those in accordance with JIS P8224: 2002 is 0.01% by mass or less, and 0.05 pieces/m of white foreign matter is observed by visual observation²Glassine paper was produced in the same manner as in example 1, except for the following pulp sheets.

When the number of white foreign matters with a size of 50 μm or less among all the foreign matters is counted, the total number of the foreign matters is 24/269 m²The number of white foreign matter particles having a size of 50 μm or less was 3/269 m²。

Comparative example 1

Except that the raw materials used were those in accordance with JIS P8224: 2002 is 0.1% by mass or less of an organic matter and 0.3 pieces/m of white foreign matter observed by visual observation²A glassine paper was produced in the same manner as in example 1, except that the following pulp sheet was subjected to papermaking in a production line in which cleaning treatment of a resin member or the like was not performed.

When the number of white foreign matters having a size of 50 μm or less was counted from all the foreign matters in the glassine paper produced from the pulp sheet, the total number of the foreign matters was 40/269 m²The number of white foreign matters having a size of 50 μm or less was 15/269 m²。

[ Performance evaluation ]

The glassine papers produced in examples 1 to 3 and comparative example 1 were sandwiched between glass plates for FPD having a thickness of 0.5mm and a size of 2500 × 2200mm, and formed into a glass plate laminate in which a plurality of glass plates were laminated.

The glass sheet laminates were placed on the vertically stacked pallets shown in fig. 6 (2000 glass sheets) on each of the cellophane papers of examples 1 to 3 and comparative example 1, and a glass sheet package was manufactured. The glass plate package was stored for 10 days.

After the glass plate was taken out from the glass package and washed, a straight line-shaped wiring having a width of 10 μm was formed on the surface of the glass plate by a conventional method, and the disconnection state of the wiring was confirmed.

Using 2000 sheets of glass plates, the case where no more than 20 broken string defects occurred was evaluated as o, and the case where more than 20 broken string defects occurred was evaluated as x.

Table 1 shows the measurement results and the evaluation results. According to Table 1, the number of white foreign matters having a size of 50 μm or less was 10/269 m²In the following cases, all the evaluation results are ∘. The ratio of white foreign matters in a size of 50 μm or less is 10/269 m²In many cases, all the evaluation results were x.

From the results, it was found that the number of white foreign matters having a size of 50 μm or less was correlated with defects such as disconnection of the glass plate.

Foreign matter larger than 50 μm is removed when the glass plate is cleaned, while white foreign matter having a size of 50 μm or less is assumed to be difficult to remove during cleaning. Therefore, the number of white foreign matters having a size of 50 μm or less was set to 10/269 m²The defects such as disconnection generated in the glass plate can be suppressed as follows.

[ TABLE 1]

The present application is based on Japanese patent application 2015-.

Claims

1. A kind of glass paper, in which,

the glassine paper is produced using a raw stock as a raw material, wherein the raw stock is produced using a raw stock according to JIS P8224: 2002 is 0.08% by mass or less and 0.14 pieces/m of white foreign matter observed by the following measurement method²The following paper pulp sheet is used,

the number of white foreign matters having a size of 50 μm or less in the above-mentioned glassine paper counted by the following measurement method was 10/269 m²In the following, the following description is given,

measurement method

(A) The glassine paper was pressed against a glass plate for evaluation having a thickness of 0.7mm and a size of 370mm × 470mm, the number of presses: 100 times, time: 4 seconds/time, pressure: 0.45MPa, glass plate temperature for evaluation: at a temperature of 55 c,

(B) supplying pure water at a flow rate of 57L/min while conveying the evaluation glass plate after the pressing at a linear velocity of 200cm/min, and cleaning the evaluation glass plate by arranging 2 roller brushes on the upper side and 2 roller brushes on the lower side of the evaluation glass plate, wherein the roller brushes have an inner diameter of a roller diameter: 60mm, outer diameter of roll diameter: 80mm, bristle diameter: 0.06 mm/tight winding, material: nylon 612, rotation speed: 300rpm, distance: the upper part and the lower part are 0mm,

(C) the cleaned glass plate for evaluation was inspected for all foreign matters using an off-line defect inspection system of FPI-6000 series, model FPI6090D manufactured by Oubao technologies to obtain an image of all foreign matters,

(D) the total foreign matter was visually observed based on the image, and the number of white foreign matters having a size of 50 μm or less was counted from among the total foreign matters.

2. The glassine paper according to claim 1,

the glassine paper is manufactured by using a paper machine, and a resin member of the paper machine is subjected to a cleaning treatment.

3. The glassine paper according to claim 1,

the white foreign matter is artificial organic matter of PET, nylon or EVA.

4. The glassine paper according to claim 1,

the number of white foreign matters having a size of 50 μm or less counted by the above-mentioned measuring method was 6/269 m²The following.

5. The glassine paper according to claim 4, wherein,

using the measuring methodThe number of white foreign matters having a size of 50 μm or less counted by the method was 3/269 m²The following.

6. The glassine paper according to any of claims 1 to 5, wherein,

the glassine paper is used for glass plates with the size of 2200mm multiplied by 1800mm or more, and the size of the glassine paper is the same as or larger than that of the glass plates.

7. The glassine paper according to any of claims 1 to 5, wherein,

the glassine paper is used for glass plates with the size of 2200mm multiplied by 1800mm or more, and the size of the glassine paper is more than 20mm larger than the size of the glass plates in length and width.

8. A glass sheet laminate formed by alternately laminating the glassine paper according to any one of claims 1 to 7 and glass sheets.

9. A glass plate package comprising the glass plate laminate according to claim 8 and a pallet on which the glass plate laminate is placed.

10. The glass sheet package of claim 9, wherein,

the pallet is a pallet on which the glass sheet laminate is placed in a flat stacked state.