TW201714846A - Glass spacer paper, glass sheet laminate, and glass sheet package characterized in that the number of white foreign matters below 50 micrometers is not more than 10/269 m2 - Google Patents

Abstract

The present invention provides a glass spacer paper, a glass sheet laminate, and a glass sheet package which can suppress the occurrence of contamination and poor wiring due to foreign matters transferred from glass spacer paper. In the prior art, it is not possible to sufficiently suppress the breakage of the wiring formed on the surface of the glass sheet by reducing the content of foreign matters in the glass spacer paper. This invention has been made in view of such a situation, and it provides a glass spacer paper, a glass sheet laminate, and glass sheet package, which can sufficiently suppress contamination and poor wiring caused by foreign matters transferred from glass spacer paper. This invention is characterized in that the number of white foreign matters below 50 micrometers is not more than 10/269 m2.

Description

Glass spacer paper, glass laminate, and glass plate bundle

The present invention relates to a glass spacer paper, a glass sheet laminate, and a glass sheet package.

A glass plate for a FPD (Flat Panel Display) such as a glass plate for a building, a glass plate for an automobile, a glass plate for a plasma display, or a glass plate for a liquid crystal display may be stored or transported. The surface is contaminated by pollutants in the environment, etc., resulting in product defects. In particular, a glass plate (glass substrate) for FPD has fine electrical wiring (hereinafter also referred to as wiring), electrodes, circuits, and partition walls on the surface, so that even if the surface has a slight flaw or contamination, it may become broken. The reason for the line and other bad. Therefore, a higher degree of surface cleansing is required for the glass sheets used for such applications. In general, the glass plate is stored and transported in a state of being stacked on a pallet for packaging. At this time, the surfaces of the adjacent glass sheets are separated from each other by interposing so-called glass spacer paper between the glass sheets, thereby preventing contamination caused by defects in the surface of the glass sheets or contaminants in the environment. However, the method of interposing the glass spacer paper between the glass sheets is such that the glass spacer paper is in direct contact with the surface of the glass sheet. Therefore, various components (foreign matter) such as a resin existing on the surface of the glass spacer paper are transferred to the surface of the glass plate. When a glass spacer having a foreign material is present on a large surface, problems such as surface pattern, fading, or dirt on the glass sheet are liable to occur. Further, it is a cause of defects such as fine wiring breakage formed on the surface of the glass sheet. Such foreign matter is difficult to completely remove from the surface of the glass plate even if it is cleaned. As a method for solving the above-mentioned problem, for example, Patent Document 1 discloses a glass plate package in which a glass plate is bundled using a glass spacer having a content of a higher saturated fatty acid of 0.08% by mass or less. Further, Patent Document 2 discloses a glass spacer having a content of an organic compound having a cerium element of 3 ppm or less. [Prior Art Document] [Patent Document] [Patent Document 1] International Publication No. 2011/118502 [Patent Document 2] International Publication No. 2014/098162

[Problems to be Solved by the Invention] In Patent Documents 1 and 2, by reducing the content of the foreign matter contained in the glass spacer paper, the occurrence of contamination on the surface of the glass plate and the disconnection of the wiring formed on the surface of the glass plate are suppressed. Such as the occurrence of bad. However, only by reducing the content of the foreign matter in the glass spacer paper, it is not possible to sufficiently suppress the occurrence of defects such as breakage of the wiring formed on the surface of the glass sheet. The present invention has been made in view of such circumstances, and provides a glass spacer paper capable of sufficiently suppressing contamination due to foreign matter transferred from the glass spacer paper, and occurrence of defects such as wiring, and the use of the glass spacer paper. A glass plate laminate and a glass plate package. [Means for Solving the Problems] In the glass spacer paper according to one aspect of the present invention, the number of white foreign matters having a size of 50 μm or less counted by the following measurement method is 10 pieces/269 m ² or less. [Measurement method] (A) Pressing the glass spacer paper to the evaluation glass plate (thickness: 0.7 mm, 370 mm × 470 mm) (number of times: 100 times, time: 4 seconds/time, pressure: 0.45 MPa, evaluation) Glass plate temperature: 55 ° C); (B) The glass plate for evaluation (wire speed: 200 cm/min) was supplied while the pressure was applied, and pure water (flow rate: 57 L/min) was supplied to the evaluation glass. Two rolls are arranged on the upper side of the plate and four rolls on the lower side (roll diameter (inner diameter): 60 mm, roll diameter (outer diameter): 80 mm, hair diameter: 0.06 mm/vol. , material: nylon 612, rotation speed: 300 rpm, distance: up and down 0 mm) to clean the above evaluation glass plate; (C) use Orbotech's offline defect inspection system (FPI-6000 series (model: FPI6090D)) to check All the foreign matter of the above-mentioned evaluation glass plate which has been cleaned is obtained, and an image of all the foreign matter is obtained; and (D) visual observation of all the foreign matters is performed according to the above image, and the size of each foreign matter is 50 μm or less. The number of white foreign objects is counted. Preferably, in the glass spacer paper, the number of white foreign matters having a size of 50 μm or less counted by the above-described measuring method is 6 pieces/269 m ² or less. Preferably, in the glass spacer paper, the number of white foreign matters having a size of 50 μm or less counted by the above-described measuring method is three/269 m ² or less. Preferably, in the glass spacer paper, the content of the organic substance measured in accordance with JIS P8224:2002 is 0.08% by mass or less. Another aspect of the glass sheet laminate system of the present invention is obtained by alternately laminating the above-mentioned glass spacer paper and a glass sheet. A glass sheet package according to another aspect of the present invention includes the glass sheet laminate and a tray on which the glass sheet laminate is placed. Preferably, the pallet is a pallet on which the glass laminate is placed in a flat stacked state. [Effect of the Invention] According to the present invention, it is possible to suppress contamination due to foreign matter transferred from the glass spacer paper and occurrence of defects such as wiring.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The invention is illustrated by the following preferred embodiments. Modifications can be made by a number of methods without departing from the scope of the invention, and other embodiments than the present embodiment can be utilized. Accordingly, all changes that come within the scope of the invention are included in the scope of the claims. Here, the parts indicated by the same symbols in the drawings are the same elements having the same functions. In the present specification, when "~" is used to indicate a numerical range, the numerical values of the upper and lower limits indicated by "~" are also included in the numerical range. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. As described above, in order to suppress the contamination of the surface of the glass sheet by the transfer of foreign matter from the glass spacer to the glass sheet, and the breakage of the wiring formed on the surface of the glass sheet, the content of the foreign matter in the glass spacer paper is reduced. method. However, according to research by the inventors of the present invention, in a glass plate in which an FPD glass plate is equal to a surface in which a component such as a wiring or an electrode is formed, due to the recent enlargement and high definition of the display, even if there is no problem before. The glass spacer paper having a small number of foreign matter is also defective in wiring or the like with an absolute low probability. Therefore, further studies have found that the present invention can be achieved by reducing the number of specific foreign matters of 50 μm or less and suppressing defects such as wire breakage. (Glass spacer paper) As the glass spacer paper used in the present embodiment, chemical pulp such as KP pulp, sulfite pulp, and sodium soda pulp (AP) can be used. Semi-chemical pulp such as semi-chemical pulp (SCP), chemical wood-grinding pulp (CGP, chemi groundwood pulp); wood pulp (GP), thermomechanical pulp (TMP), wood chips Mechanical pulp such as RGP (refiner groundwood pulp); non-wood fiber pulp which is made of bismuth, triterpene, hemp, kenaf, etc.; and glass spacer paper containing various raw materials such as synthetic pulp. Further, the glass spacer paper of the present invention may be one having the above-mentioned mixture as a raw material, or a material containing cellulose or the like may be used as a raw material. Moreover, the raw materials may be waste paper, may be new pulp (Virgin pulp), or may be a mixture of waste paper and new pulp. Among them, new pulp is preferred. In the glass spacer paper of the present embodiment, an anthrone-based defoaming agent (containing an anthrone) which is a major cause of a defect such as a wiring or an electrode when the glass sheet is not used is preferably used. The pulp produced by the defoaming agent is used as a raw material. Among them, a pulp which is produced without using an antifoaming agent containing polydimethylsiloxane is particularly suitable as a raw material of the glass spacer of the present embodiment. Further, the glass spacer paper preferably has a content of the organic substance measured in accordance with JIS P8224:2002 of 0.08% by mass or less. The lower limit of the content of the organic substance is not particularly limited, and is, for example, 0.001% by mass or more. By allowing the content of the organic substance to be 0.08% by mass or less, it is possible to suppress the transfer of organic substances from the glass spacer to the glass plate. (Measurement Method) Next, a method of measuring foreign matter of the glass spacer paper will be described. Fig. 1 is a view showing the overall configuration of a measuring apparatus 10 according to an embodiment. The pressing device 12 is shown in Fig. 1(A), the cleaning device 14 is shown in Fig. 1(B), the defect inspection device 16 is shown in Fig. 1(C), and the display device 18 is shown in Fig. 1(D). The pressing device 12 is composed of a lower pressing plate 20, an upper pressing plate 22, and a cylinder device 24. A plate-shaped adsorption pad 26 is attached to the upper surface of the lower platen 20, and the evaluation glass plate 28 having a rectangular shape to be inspected is detachably attached to the upper surface of the adsorption pad 26. Here, the evaluation glass plate 28 has a thickness of 0.7 mm and 370 mm × 470 mm. The evaluation glass plate 28 is exemplified by a glass plate for FPD such as a liquid crystal display (LCD), a plasma display panel (PDP), or an organic electroluminescence (EL) display. Here, a flat glass plate including a glass plate for a building or a glass plate for a vehicle is used. The upper platen 22 is disposed opposite to the lower platen 20 in the vertical direction. Further, the upper platen 22 is fixed to a frame (not shown). Further, a plate-shaped adsorption pad 30 is attached to the lower surface of the upper platen 22, and a dummy glass plate 32 is detachably adsorbed and held on the lower surface of the adsorption pad 30. The strip-shaped glass spacer 36 rewinded from the spacer paper supply device (see FIG. 2) 34 is inserted into the evaluation glass plate in parallel with the surface of each of the evaluation glass plate 28 and the dummy glass plate 32. The gap between 28 and the dummy glass plate 32. The cylinder device 24 is a fluid cylinder that raises and lowers the lower platen 20, and the cylinder main body 38 is fixed to a stand (not shown), and the upper end portion of the piston 40 that is expanded and contracted with respect to the cylinder main body 38 is fixed to the lower surface of the lower platen 20. Therefore, when the piston 40 is extended, the lower platen 20 is raised, whereby the evaluation glass plate 28 abuts against the glass spacer paper 36 located above the lower platen 20. After the glass spacer paper 36 is lifted upward (in the direction of the dummy glass plate 32) by the continuous upward movement of the lower platen 20, the glass plate 28 for evaluation is sandwiched by the dummy glass plate 32. Thereby, the evaluation glass plate 28 and the glass spacer paper 36 are pressed. Further, at the time of pressing, the glass spacer paper 36 is supported by the upper platen 22 via the glass plate 32. Further, since the glass spacer paper 36 is sandwiched between the evaluation glass plate 28 and the dummy glass plate 32, the glass plate laminate (Fig. 6) in which the spacer paper is laminated via the spacer is reproduced in the package (Fig. 6). form. Further, by pressing the evaluation glass plate 28 to the glass spacer paper 36 with a specific pressing force, the load can be reproduced close to the actual conveyance. Further, when the piston 40 is contracted, the lower platen 20 is lowered in the direction in which the pressing is removed. Further, in the embodiment, the lower platen 20 is moved up and down. However, the present invention is not limited thereto, and the lower platen 20 and the upper platen 22 may be relatively lifted and lowered. FIG. 2 is an explanatory view showing the pressing operation by the pressing device 12 and the spacer paper supply device 34 and the interval paper supply operation in chronological order. In fact, when the glass plate for FPD is packaged and transported, in general, the glass spacer paper is supplied by a paper maker or the like in a roll shape and has a desired size and shape (substantially similar to the glass plate of the packaging object). The rectangular shape is used in the state of being cut. In the measuring device 10 of the embodiment, the strip-shaped glass spacer paper 36 in a state of being rewinded from the state of the roller before cutting is used. The spacer paper supply device 34 is a rotation support portion 46 that rotatably supports the spacer paper roll 42 wound in a roll shape around the winding axis 44, and a strip-shaped glass space is taken from the spacer paper roll 42. The winding portion 48 of the paper 36 is formed. As shown in FIG. 2(A), the front end portion of the glass spacer paper 36 is fixed to the take-up shaft 54. At this time, the lower platen 20 is located at the pressing removal position that is retracted downward from the pressing position. In the initial setting before the start of the evaluation, the glass spacer paper 36 is rewinded from the spacer paper roll 42 in the direction of the arrow A, wound around the tension roller 50, and inserted into the gap between the lower platen 20 and the upper platen 22. Then, the glass spacer paper 36 is wound around the tension roller 52, and the front end portion of the glass spacer paper 36 is fixed to the take-up shaft 54 of the winding portion 48. The take-up shaft 54 transmits the power of the motor 56 to rotate the glass spacer paper 36 in the same direction as the direction in which the paper feed roller 42 is rewinded (the direction of the arrow A). In this manner, the glass spacer paper 36 is taken up on the take-up shaft 54. Next, as shown in Fig. 2(B), the piston 40 of the cylinder device 24 is extended, and the lower platen 20 is raised in the direction of the arrow B of the glass plate 28 for evaluation and the glass spacer paper 36 to evaluate the glass plate for evaluation. The surface of 28 is pressed to the glass spacer paper 36. The conditions at this time were set to 4 seconds/time, a pressure of 0.45 MPa, and a temperature of the evaluation glass plate 28 of 55 °C. Next, as shown in FIG. 2(C), the piston 40 of the cylinder device 24 is contracted, and the lower platen 20 is placed at the pressing removal position which is retracted downward from the pressing position. Thereafter, the glass spacer paper 36 is wound back from the spacer paper roll 42 by only one sheet by the spacer paper supply device 34. Further, although not shown in FIG. 2, a control device for intermittently driving and controlling the cylinder device 24 and the motor 56 is provided. The control device alternates between the intermittent pressing and the pressing release operation of the cylinder device 24 indicated by the arrows B and C, and the intermittent paper winding operation of the intermittent amount of the motor 56 indicated by the arrow A. Control by way. In other words, the control device intermittently drives and controls the cylinder device 24 and the motor 56 so that the interval paper supply step of the spacer paper supply device 34 and the pressing step of the cylinder device 24 are alternately performed with respect to the evaluation glass plate 28 plural times. The interval between the sheets of the glass spacers 36 and the sheet winding operation means that the size of the glass spacers 36 used for packaging and transporting the evaluation glass sheets 28 is one sheet, and the sheet is taken up by one sheet. Thereby, the evaluation glass plate 28 is always pressed to the new glass spacer paper 36. The foreign matter information of the large-area interval paper roll 42 can be collected in one evaluation glass plate 28 by repeatedly performing a plurality of interval paper winding operations with respect to the spacer paper roll 42. In Fig. 2(D), the above operation is repeated for 100 times. Although the interval paper winding operation of the entire length of the spacer paper roll 42 can be repeated, the time for collecting the foreign matter information in one evaluation glass plate 28 becomes long. In the present embodiment, the spacer paper winding operation is set to 100 times, and even the foreign matter information of the 100 sheets of the glass spacer paper 36 is collected in the evaluation glass plate 28 in consideration of the foreign matter information and time of the evaluation glass plate 28. . Further, in the case where the glass spacer paper 36 cut in the same size as the evaluation glass plate 28 is used in the pressing device 12 of the embodiment, the glass spacer paper 36 is attached to the dummy glass plate of the upper pressing plate 22. 32 below the surface can be. Thereby, the glass spacer paper 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 on which the glass spacer paper 36 is pressed by the pressing device 12, and attaches (transfers) the glass spacer paper 36 to the evaluation glass plate 28. Foreign matter removal on the surface. The cleaning device 14 conveys the evaluation glass plate 28 at a line speed of 200 cm/min, and supplies pure water from the nozzle 58 at a flow rate of 57 L/min, and the upper first roller brush 60, the upper second roller brush 62, and the lower side. The side first roller brush 64 and the lower second roller brush 66 clean the evaluation glass plate 28 at a number of revolutions of 300 rpm (the same direction as the direction in which the evaluation glass plate 28 is conveyed). Further, foreign matter that is difficult to remove during cleaning cannot be removed and remains on the surface of the evaluation glass plate 28. In the embodiment, the first roller brush 60 and the upper second roller brush 62 disposed on the upper side of the evaluation glass plate 28 and the first roller brush 64 disposed on the lower side of the evaluation glass plate 28 and Lower second roller brush 66. Further, a nozzle 58 for spraying pure water onto 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 are brought into contact with the surface of the evaluation glass plate 28 to rotate. 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 has a roll diameter (inner diameter) of 60 mm, a roll diameter (outer diameter) of 80 mm, and a roll of a roll of 0.06 mm. The hair of the roller brush is composed of nylon 612. The dense roll means that the grooved brush after the hair is wound is wound around the roll without any gap. As shown in FIG. 3(A), the distance L1 between the upper first roller brush 60 and the upper second roller brush 62 is 200 mm. Further, the distance L2 between the upper first roller brush 60 and the lower first roller brush 64 is 50 mm. Further, as shown in Fig. 3(A), before the evaluation glass plate 28 is passed, the upper first roller brush 60 and the lower first roller brush 64 are disposed at the position where the respective hairs are in contact with each other, that is, 0 mm above and below. position. Similarly, the upper second roller brush 62 and the lower second roller brush 66 are disposed at positions where the respective hairs are in contact with each other, that is, at a position of 0 mm above and below. According to the cleaning device 14, the evaluation glass plate 28 is conveyed in the direction of the arrow D, and 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, and the lower side are provided. The side 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, whereby the surface of the evaluation glass plate 28 is cleaned. 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 0 mm up and down. Therefore, as shown in FIG. 3(B), the evaluation glass plate 28 passes between the upper first roller brush 60 and the lower first roller brush 64, and the upper second roller brush 62 and the lower second roller brush 66. In the meantime, 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 thickness of the evaluation glass plate 28 by a considerable amount. For evaluation glass plate 28. The foreign matter which can be removed by washing, such as dust and paper dust from the glass spacer paper 36, and the foreign matter which is difficult to remove are adhered to the surface of the evaluation glass plate 28 after the pressing step of the pressing device 12. The evaluation object of the glass spacer paper 36 and the evaluation glass plate 28 is a foreign matter that is difficult to remove by cleaning on the surface of the evaluation glass plate 28. Thereby, in the washing step of the cleaning device 14, the foreign matter that can be removed by the cleaning is removed from the evaluation glass plate 28, and the foreign matter that is difficult to remove by washing is left on the glass plate. As shown in Fig. 1(C), the cleaned evaluation glass plate 28 is transported to the defect inspection device 16 (Orbotech's offline defect inspection system FPI-6000 series (model: FPI6090D). The defect inspection device 16 checks the cleaning. The foreign matter on the surface of the glass plate 28 is evaluated. The defect inspection device 16 checks the foreign matter that is difficult to remove on the surface of the evaluation glass plate 28 by the light transmission method, and obtains an image of all foreign matter. Next, as shown in Fig. 1 ( As shown in D), the image 80 obtained by the defect inspection device 16 is displayed on the display device 18. The appearance of all the foreign matter is visually observed based on the image 80. White foreign matter of a size of 50 μm or less is applied from all foreign materials. The number of the white foreign matter is not particularly limited, and is, for example, 0.1 μm or more. Next, a method of measuring the amount of white foreign matter is described. The offline defect manufactured by Orbotech, which is the defect inspection device 16 is used. Check the system (FPI-6000 series (model: FPI6090D)) and check all foreign objects in the evaluation glass plate 28 after cleaning to obtain an image of all foreign objects. The conditions for the defect inspection system are shown below. The sensitivity is set to high sensitivity mode (2 μm), and the non-measurement area is set to 10 mm from the end. Further, the lamp illumination is set to "30" instead of the standard sensitivity mode. (66) of (4 μm), that is, the lamp illumination is reduced compared to the standard sensitivity mode. On the other hand, regarding the setting (threshold value) of the light-receiving element side, the threshold that is effective in the darker portion is set to "30". It is not the "15" of the standard sensitivity mode. That is, the threshold is raised, so that the brighter portion is detected compared to the standard sensitivity mode. The threshold value that is effective in the brighter portion is the same as the "10" of the standard sensitivity mode. It is set to "10." All defective images are automatically stored in the defect inspection device 16. Finally, the image 80 obtained by the defect inspection device 16 is displayed on the display device 18, and all foreign matter is The appearance was observed by visual observation, and the number of white foreign matter of 50 μm or less was counted from all the foreign materials. Here, the "visual observation by visual observation" is included in a different order and will be given by the defect inspection device 16. The scale of the obtained image 80 is taken as a reference, and the behavior of the foreign matter of 50 μm or less is cited based on the long diameter direction, and the behavior of the white foreign matter is exemplified by the types of the plurality of foreign substances shown below. The type of all foreign matter of the evaluation glass plate 28 obtained by the defect inspection device 16 will be described. Fig. 4 is a case where the glass spacer paper 36 is pressed to the evaluation glass plate 28 by 100 times, and is cleaned by the cleaning device 14 by the defect. The image of the foreign matter obtained by the inspection device 16 is examined. The inventors have studied the foreign matter based on the image obtained by the defect inspection device 16 and found that there are some types of foreign matter. Fig. 4(A) shows the black of a size of 50 μm or less. Foreign matter (black / small). Fig. 4(B) shows black foreign matter (black/large) of a size larger than 50 μm. Fig. 4(C) shows a white foreign matter (white/small) having a size of 50 μm or less. Fig. 4(D) shows white foreign matter (white/large) of a size larger than 50 μm. Fig. 4(E) shows a collection of a plurality of foreign bodies (dense). Fig. 4(F) shows foreign matter (others) which are not contained in the foreign matter of Figs. 4(A) to (E). Here, the white foreign matter (white foreign matter) means an image which can be confirmed in the outer peripheral portion (contour portion) and the foreign matter in the image taken under the defect inspection condition as shown in FIG. 4 . Foreign matter in the contrast area. Further, when there is a plurality of aggregates of foreign objects in one image, the aggregate is acquired as a foreign object, and the size is determined based on the long diameter direction. The size of the foreign matter is classified into a foreign matter of 50 μm or less and a foreign matter of more than 50 μm based on the long diameter direction. Further, for example, when counting the number of all foreign matter of two different types of glass spacer paper, there is a case where the total number of foreign matters is substantially the same, but a white foreign matter having a size of 50 μm or less of a glass spacer paper The amount of white foreign matter is less than 50 μm of the other glass spacer paper. Moreover, for the other two different types of glass spacer paper, even if the total number of foreign matter of one glass spacer paper is less than the total number of foreign matter of another glass spacer paper, there is also a glass for the number of white foreign objects of 50 μm or less. The case where the number of spacer sheets is larger than the number of other glass spacer sheets. Further, the lower limit of the number of white foreign matter is not particularly limited, and is, for example, one/269 m ² or more. That is, the number of white foreign matters of 50 μm or less in the total number of foreign matters differs for each of the glass spacers. The inventors have focused on the number of white foreign objects of a size of 50 μm or less and not the total number of foreign matters. As a result, it has been found that glass spacer paper having a small amount of white foreign matter of 50 μm or less can suppress the occurrence of defects such as breakage of the glass plate. . The results are explained in the following examples. After analysis of the white foreign matter, it is mainly a so-called artificial organic substance such as PET (polyethylene terephthalate) or nylon or EVA (ethylene-vinyl acetate copolymer resin). It is considered that the artificial organic substance is in contact with the paper raw material liquid or the wet paper, for example, when the paper raw material liquid passes through the plastic thread used in the wire portion, or when the wet paper is mechanically pressed and dehydrated by the array roller and the felt in the press portion. When mixed in. The inventors and others have repeatedly tried hard to study and understand that as a cause of white foreign matter, the influence from a contact member called a canvas belt is particularly large. (Manufacturing Method of Glass Spacer Paper) FIG. 5 is a schematic configuration diagram of a paper machine 100 for manufacturing glass spacer paper. As shown in FIG. 5, the raw material liquid for glass spacer paper (the liquid obtained by diluting the pulp with water) is supplied from the front groove 112 in a sheet form to the lower line 116 provided on the line portion 114. The paper stock liquid supplied to the lower line 116 is then sandwiched by the lower thread 116 and the upper thread 118, thereby expanding and dehydrating in a uniform thickness to become wet paper (paper). The lower line 116 and the upper line 118 of the line portion 114 are penetrating films formed in an endless strip shape. Specifically, it is a web made of plastic or metal material, or an endless belt made of felt of natural or synthetic fibers. The lower wire 116 and the upper wire 118 are mounted on a plurality of rollers, and the driving force of the motor (not shown) is transmitted to the driving rollers of the plurality of rollers, thereby moving around at a specific speed. The wet paper formed on the line portion 114 is conveyed to a press portion 120 having a press roll, an endless belt-shaped felt, and a press roll pair, and further dewatering and pressing are simultaneously performed. The wet paper passing through the press section 120 is conveyed to the dryer section 124 composed of a plurality of rollers, and is dried in the environment of passing through the dryer section 124, for example, at about 120 °C. When the dryer unit 124 is passed through the dryer unit 124, if the wet paper is directly conveyed at a high speed, the paper is broken. Therefore, the auxiliary member called the canvas is conveyed while being in contact with the wet paper. In order to obtain a glass plate having less white foreign matter as in the present embodiment, it is preferably carried out as follows. That is, the material constituting the canvas is not made of a so-called artificial organic substance such as PET (polyethylene terephthalate) or nylon, EVA (ethylene-vinyl acetate copolymer resin), or a canvas tape. The surface of the canvas or the like is applied before replacement due to replacement, or in the case where cellulose, SiO ₂ or the like cannot be white foreign matter. The paper which has been dried by the dryer unit 124 is conveyed to the calendering unit 126, and is subjected to calendering by the conveyance of the calender rolls or the like to smooth the front and back surfaces. Further, if necessary, an application portion may be provided between the dryer portion 124 and the calendering portion 126, and a coating material or the like may be applied to the surface of the smoothed paper. The paper subjected to the calendering treatment by the calendering unit 126 is taken up as a glass spacer paper on the reel 128, and formed into a roll shape (hereinafter, referred to as a jumbo roll 130). Regarding the glass spacer paper formed as the jumbo roll 130, for example, the glass spacer paper is cut into a width corresponding to the product and wound up to form a long strip of glass spacer paper of about 8000 to 10000 m. The paper roll 42 is spaced. That is, in general, the glass spacer paper is used in a small portion from the giant roller 130. The glass spacer paper is fed from the giant roller 130, cut into a specific width (cut in the longitudinal direction) by the cutter 134, and taken up by the winder 136. The glass spacer paper fed from the giant roller 130 is cut into a specific length (cut in the width direction) by a cutter 134 at a specific length of time to form a long strip of glass spacer paper with a specific width. A spacer paper roll 42 is formed. The long glass-spaced paper wound into the spacer paper roll 42 is cut into a slice shape (rectangular shape) corresponding to the laminated glass plate, and interposed between the laminated glass plates. In the papermaking machine 100 (papermaking step) of the glass spacer paper, when the paper raw material liquid supplied to the front tank 112 is prepared, it is preferable to use a pulp having a small amount of white foreign matter as a pulp sheet to be a raw material. For example, the number of white foreign matters of the pulp sheet is counted in the same manner as the measurement method performed on the above glass spacer paper. The pulp sheet is screened according to the number of white foreign objects, so that a pulp sheet having less white foreign matter can be used. In the manufacturing process of the pulp sheet, there is also a case where artificial organic matter adheres to the pulp sheet when it comes into contact with the resin member. Further, there is a problem that the artificial organic matter of the pulp sheet is mixed into the glass spacer paper. Further, it is preferred that the content of the artificial organic substance in the pulp sheet is 0.08% by mass or less. Since the content of the artificial organic matter is 0.08% by mass or less, the artificial organic matter mixed into the glass spacer paper can be lowered. Here, the artificial organic substance is a resin component in a pulp sheet measured in accordance with JIS P8224:2002. The use of a pulp having a small amount of white foreign matter is preferable for producing a glass spacer paper having less white foreign matter. In the case where the number of white foreign matters is counted by the pulp sheet, the number of white foreign matters having a size of 50 μm or less is preferably 200/m ² or less. In order to reduce the incorporation of organic substances in the papermaking step, it is preferred to remove the resin burrs of the resin member which is used in the papermaking step and which is in contact with the paper raw material liquid or wet paper. Since the resin burrs are easily detached and easily mixed into the paper stock solution or wet paper, it is effective to remove the resin burrs. Further, it is preferred to carry out weak alkali cleaning or weak acid cleaning in all piping steps before papermaking. The object of the invention is to suppress the incorporation of organic substances generated when other spacer papers are produced in the case of newly manufactured glass spacer paper. If the management of the foundation that has not been previously performed as described above is not performed, it is difficult to manufacture a glass spacer paper having less white foreign matter. (Glass Plate Bundle) The glass plate package of the present embodiment has a glass plate laminate in which glass separator paper and a glass plate are alternately laminated, and a pallet on which the glass plate laminate is placed. An example of a glass plate bundle is conceptually shown in FIG. In addition, FIG. 6 is a view (side view) of the glass plate package body viewed from the side direction of the glass. The glass sheet package body 250 shown in FIG. 6 includes a glass sheet laminate 262 in which glass spacer paper 260 and glass sheet G are alternately laminated, and a pallet 252 on which the glass sheet laminate 262 is placed. The pallet 252 is a known pallet for glass sheet packaging, and has a base 254, a tilting table 256 standing on the upper surface of the base 254, and a mounting table 258 placed on the upper surface of the base 254. One of the horizontal surfaces of the tilting table 256 (contact surface with the glass plate G = back surface) is inclined with respect to the vertical direction (hereinafter, also referred to as an inclined surface). The angle of the inclined surface may be an angle at which the laminated glass sheet G can be stably stacked, stored, and transported, and is usually 85° or less with respect to the horizontal direction, and is preferably, for example, 85° to 70°. Further, the upper surface of the mounting table 258 is inclined so as to descend toward the tilting table 256 with respect to the horizontal direction. In the example of the drawing, as an example, the upper surface of the mounting table 258 is configured to be 90° with respect to the inclined surface of the tilting table 256. On the pallet 252, the glass sheet G is placed on the upper surface of the mounting table 258, and is laminated on the inclined surface of the tilting table 256. Further, the glass spacer 260 of the present embodiment is interposed between the glass sheets G. The glass spacer paper 260 is larger than the glass sheet G and is interposed between the glass sheets G so as to cover the entire surface of the glass sheet G. Further, the size of the glass sheet G is preferably 2,200 mm × 1800 mm or more. When the size of the glass sheet is large, the rate of occurrence of defects such as breakage of the wiring becomes high, so that the glass spacer paper of the present embodiment can be preferably used. Further, the size of the glass sheet G is preferably 2400 mm × 2100 mm. As the size of the glass spacer paper, it is preferably the same size as or larger than the size of the glass plate, and particularly preferably has a large aspect ratio of 20 mm or more. Further, the glass spacer paper 260 may be interposed between the laminated glass sheet G and the tilting table 256, and the surface of the frontmost glass sheet G may be similarly covered with the glass spacer paper 260. The glass sheet package body 250 is formed as described above. In this case, the protective sheet may be brought into contact with the frontmost glass sheet G (glass spacer paper) as needed, and the strip-shaped body may be erected and fixed to the tilting table 256, or may cover all the glass sheets G. Cover it with a cover. Further, the glass plate package of the present invention is not limited to the case where the glass plate G is placed against the glass plate package 250 as shown in Fig. 6 and stacked (so-called vertical stacking). For example, in the case of the plate-shaped body storage container shown in Japanese Laid-Open Patent Publication No. 3165973, the glass plate G can be used as a pallet for horizontally stacking the glass sheets G (so-called flat stacking). In the case of stacking in a flat state, the load acting on the glass plate and the glass spacer paper near the bottom becomes large, so foreign matter is easily transferred from the glass spacer paper to the glass plate, so that it is impossible to stack a larger number of pieces, but by using this The glass spacer paper of the embodiment can stack a large number of blocks. Specifically, even when the glass spacer paper is pressed against the glass plate at a surface pressure of 30 g/cm ² or more per unit area, the foreign matter transferred from the glass spacer 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 in which elements such as wirings or electrodes as described above are formed on the surface is preferable, and a glass plate for FPD is particularly preferable. In the above, the glass spacer paper, the glass sheet laminate, and the glass sheet package have been described in detail. However, the present invention is not limited to the above examples, and various modifications may be made without departing from the scope of the invention. change. [Examples] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by the examples. [Example 1] A glass paper having a general glass spacer paper shown in Fig. 5 was used, and a new paper pulp (pulp paper) was used as a raw material to prepare a glass spacer. A pulp sheet having a content of an organic substance measured according to JIS P8224:2002 of 0.08 mass% or less and a white foreign matter observed by visual observation of 0.14 pieces/m ² or less was used as a raw material. For the glass spacer paper made of the pulp sheet: (A) Press the glass spacer paper to the evaluation glass plate (thickness 0.7 mm, 370 mm × 470 mm) (number of times: 100 times, time: 4 seconds / Time, pressure: 0.45 MPa, evaluation glass plate temperature: 55 ° C); (B) One-side delivery of the evaluation glass plate (line speed 200 cm / min), one side of pure water (flow: 57 L / min) 2 rolls are arranged on the upper side of the evaluation glass plate and 2 rolls on the lower side (roll diameter (inner diameter): 60 mm, roll diameter (outer diameter): 80 mm, hair diameter) : 0.06 mm / compact roll, material: nylon 612, rotation speed: 300 rpm, distance: up and down 0 mm) to clean the above evaluation glass plate; (C) use Orbotech's offline defect inspection system (FPI-6000 series (model :FPI6090D)) to inspect all foreign matter in the cleaned glass plate for evaluation, to obtain an image of all foreign matter; and (D) visually observe all foreign matter according to the image, from all foreign materials to 50 μm or less after the size of the number of white foreign substances is counted, the total number of foreign matters of spaced glass sheet 32/269 m ^2, 50 μm The number of white foreign body under the size of 10/269 m ^2. [Example 2] As a raw material, a pulp sheet having a content of an organic substance measured in accordance with JIS P8224:2002 of 0.05% by mass or less and a visually observed white foreign matter of 0.1/m ² or less was used, and examples were also given. 1 A glass spacer paper was produced in the same manner. In the glass spacer paper produced from the pulp sheet, the total number of foreign matters of 50 μm or less from all foreign materials is counted, and the total number of foreign matters is 25/269 m ² and white of 50 μm or less. The number of foreign objects is 6 / 269 m ² . [Example 3] As a raw material, a pulp sheet having a content of an organic substance measured according to JIS P8224:2002 of 0.01% by mass or less and a visually observed white foreign matter of 0.05 pieces/m ² or less was used, and examples were also given. 1 A glass spacer paper was produced in the same manner. In the glass spacer paper produced from the pulp sheet, the total number of foreign matters of 50 μm or less from all foreign materials is counted, and the total number of foreign matters is 24/269 m ² and white of 50 μm or less. The number of foreign bodies is 3 / 269 m ² . [Comparative Example 1] As a raw material, a pulp sheet having a content of an organic substance measured according to JIS P8224:2002 of 0.1% by mass or less and a visually observed white foreign matter of 0.3 pieces/m ² or less was used, and the resin member was not cleaned. A glass spacer paper was produced in the same manner as in Example 1 except that the paper was processed by a line of processing or the like. In the glass spacer paper produced from the pulp sheet, the total number of foreign matters of 50 μm or less from all foreign materials is counted, and the total number of foreign matters is 40/269 m ² and white of 50 μm or less. The number of foreign objects is 15 / 269 m ² . [Performance Evaluation] The glass spacer papers produced in the above Examples 1 to 3 and Comparative Example 1 were placed between glass sheets for FPDs having a thickness of 0.5 mm and 2500 × 2200 mm to form a plurality of glass sheets. Made of glass laminate. The glass plate laminate was placed on the pallets shown in Fig. 6 (the glass plates 2000) stacked vertically on the respective glass spacers of Examples 1 to 3 and Comparative Example 1, and a glass plate package was produced. The glass plate was packaged for 10 days. The glass plate was taken out from the glass package, and after the glass plate was cleaned, a linear wiring having a width of 10 μm was formed on the surface of the glass plate by an existing method, and the disconnection of the wiring was confirmed. Using 2000 glass plates, the case where 20 or less broken wires were defective was evaluated as ○, and the case where more than 20 broken wires were broken was evaluated as ×. Table 1 shows the measurement results and evaluation results. According to Table 1, when the white foreign matter having a size of 50 μm or less is 10/269 m ² or less, the evaluation results are all ○. When the amount of white foreign matter of 50 μm or less is more than 10/269 m ² , the evaluation results are all ×. From this result, it can be understood that the number of white foreign objects having a size of 50 μm or less is related to defects such as breakage occurring on the glass plate. It is presumed that foreign matter larger than 50 μm is removed when the glass plate is cleaned, and on the other hand, white foreign matter having a size of 50 μm or less is difficult to remove during cleaning. Thus, by setting the number of white foreign matters having a size of 50 μm or less to 10/269 m ² or less, it is possible to suppress defects such as breakage occurring on the glass plate. [Table 1] The present application is based on Japanese Patent Application No. 2015-190848, filed on Sep. 29, 2015, and the entire disclosure of the entire disclosure of the disclosure of

10‧‧‧Measurement device
12‧‧‧ Pressing device
14‧‧‧cleaning device
16‧‧‧ Defect inspection device
18‧‧‧ display device
20‧‧‧Unloading plate
22‧‧‧Upper platen
24‧‧‧Cylinder installation
26‧‧‧Adsorption pad
28‧‧‧Evaluation glass plate
30‧‧‧Adsorption pad
32‧‧‧ glass plate
34‧‧‧ Spacer supply device
36‧‧‧glass spacer paper
38‧‧‧Cylinder body
40‧‧‧Piston
42‧‧‧ interval paper roll
44‧‧‧Winding shaft
46‧‧‧Rotation Support
48‧‧‧Winding Department
50‧‧‧ Tension roller
52‧‧‧ Tension roller
54‧‧‧Winding shaft
56‧‧‧Motor
58‧‧‧ nozzle
60‧‧‧1st roller brush on the upper side
62‧‧‧Upper second roller brush
64‧‧‧1st roller brush on the lower side
66‧‧‧2nd roller brush on the lower side
80‧‧‧ images
100‧‧‧paper machine
112‧‧‧ front slot
114‧‧‧Line Department
116‧‧‧Offline
118‧‧‧Online
120‧‧‧Squeeze
124‧‧‧Dryer Department
126‧‧‧The Department of Calendering
128‧‧‧Reel
130‧‧‧Super Roller
134‧‧‧Cutter
136‧‧‧Winding machine
250‧‧‧glass plate bundle
252‧‧‧ board
254‧‧‧Abutment
256‧‧‧ tilting table
258‧‧‧mounting table
260‧‧‧glass spacer paper
262‧‧‧ glass laminate
G‧‧‧glass plate
L1‧‧‧ distance
L2‧‧‧ distance

Fig. 1 (A) to (D) are overall configuration diagrams of the measuring device. 2(A) to 2(D) are explanatory diagrams showing the interval paper supply operation and the pressing operation by the pressing device and the spacer paper supply device in chronological order. 3(A) and 3(B) are explanatory views showing a state in which the evaluation glass plate passes through the cleaning device. 4(A) to (F) are images obtained by the defect inspection device. Fig. 5 is a schematic configuration diagram of a paper machine for manufacturing a glass spacer. Fig. 6 is a view conceptually showing an example of a glass plate package.

10‧‧‧Measurement device

12‧‧‧ Pressing device

14‧‧‧cleaning device

16‧‧‧ Defect inspection device

18‧‧‧ display device

20‧‧‧Unloading plate

22‧‧‧Upper platen

24‧‧‧Cylinder installation

26‧‧‧Adsorption pad

28‧‧‧Evaluation glass plate

30‧‧‧Adsorption pad

32‧‧‧ glass plate

36‧‧‧glass spacer paper

38‧‧‧Cylinder body

58‧‧‧ nozzle

60‧‧‧1st roller brush on the upper side

62‧‧‧Upper second roller brush

64‧‧‧1st roller brush on the lower side

66‧‧‧2nd roller brush on the lower side

80‧‧‧ images

Claims (7)

A glass spacer paper which is counted by the following measurement method and has a number of white foreign matters of 50 μm or less and a number of white foreign matters of 10 pieces/269 m ² or less, [Measurement Method] (A) Pressing the glass spacer paper to the evaluation Glass plate (thickness 0.7 mm, 370 mm × 470 mm) (number of times: 100 times, time: 4 seconds/time, pressure: 0.45 MPa, evaluation glass plate temperature: 55 ° C); (B) one side has been transported The evaluation glass plate for evaluation (wire speed: 200 cm/min) was supplied with pure water (flow rate: 57 L/min), and two were disposed on the upper side of the evaluation glass plate and two on the lower side. Total of 4 roller brushes (roll diameter (inner diameter): 60 mm, roll diameter (outer diameter): 80 mm, hair diameter: 0.06 mm/volume, material: nylon 612, rotation speed: 300 rpm, distance: up and down 0 mm) to clean the above evaluation glass plate; (C) Use Orbotech's offline defect inspection system (FPI-6000 series (model: FPI6090D)) to inspect all the foreign matter of the above-mentioned evaluation glass plate, and obtain all An image of the foreign matter; and (D) visually observing all of the above foreign objects according to the above image, from the above All white foreign matter number of foreign matters of 50 μm or less the size of the counting. The glass spacer paper of claim 1, wherein the number of white foreign matters having a size of 50 μm or less counted by the above-described measuring method is 6 pieces/269 m ² or less. The glass spacer paper of claim 2, wherein the number of white foreign matters having a size of 50 μm or less counted by the above-described measuring method is 3/269 m ² or less. The glass spacer paper according to any one of claims 1 to 3, wherein the content of the organic substance measured according to JIS P8224:2002 is 0.08% by mass or less. A glass sheet laminate which is obtained by alternately laminating glass spacer paper and glass sheets according to any one of claims 1 to 4. A glass sheet package comprising the glass sheet laminate according to claim 5 and a tray on which the glass sheet laminate is placed. The glass sheet package according to claim 6, wherein the tray is a tray on which the glass sheet laminate is placed in a flat stacked state.