TWI797063B - Glass spacers, glass plate laminates, and glass plate packages - Google Patents

Abstract

The present invention provides a glass spacer, a glass plate laminate, and a glass plate package capable of suppressing contamination due to foreign matter transferred from the glass spacer, wiring, and the like.

Description

Glass spacers, glass plate laminates, and glass plate packages

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

Glass plates for FPD (Flat Panel Display) such as glass plates for construction, glass plates for automobiles, glass plates for plasma displays, and glass plates for liquid crystal displays may have flaws on the surface during storage or transportation. The surface is polluted by pollutants in the environment, etc., resulting in product defects. In particular, the glass plate (glass substrate) for FPD has fine electrical wiring (hereinafter also referred to as wiring), electrodes, circuits, and partition walls and other components formed on the surface, so even if there is a slight flaw or contamination on the surface, it will become a disconnection. Causes of defective lines, etc. Therefore, a higher degree of surface cleanliness is required for glass sheets used in these applications. In general, glass plates are stored and transported in a state of being laminated on pallets for packaging or the like. At this time, by interposing so-called glass spacer paper between the glass plates to separate the surfaces of adjacent glass plates from each other, pollution caused by flaws on the surfaces of the glass plates or polluting substances in the environment is prevented. However, the method of interposing the glass spacer paper between the glass plates is to bring the glass spacer paper in direct contact with the surface of the glass plates. Therefore, various components (foreign substances) such as resin existing on the surface of the glass spacer paper are transferred to the surface of the glass plate. When using a glass spacer paper with a lot of foreign matter on the surface, it is easy to cause problems such as surface pattern, fading or dirt on the glass plate. Moreover, it becomes the cause of failure, such as the breakage of the fine wiring formed on the surface of a glass plate. Even if such foreign matter is cleaned, it is difficult to completely remove it from the surface of the glass plate. As a means of solving the above-mentioned problems, for example, Patent Document 1 discloses a glass plate package in which glass plates are packaged with glass spacer paper having a higher saturated fatty acid content of 0.08% by mass or less. In addition, Patent Document 2 discloses a glass spacer in which the content of an organic compound having a silicon element is 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, the generation of contamination on the surface of the glass plate and the disconnection of wiring formed on the surface of the glass plate are suppressed by reducing the content of foreign matter contained in the glass spacer paper. Wait for the bad to happen. However, only by reducing the content of the foreign matter in the glass spacer, it may not be possible to sufficiently suppress generation of defects such as disconnection of wiring formed on the surface of the glass plate. The present invention has been made in view of the above circumstances, and provides a glass spacer that can sufficiently suppress contamination caused by foreign matter transferred from the glass spacer and occurrence of wiring defects, and a glass spacer using the glass spacer. A glass plate laminate, and a glass plate package. [Technical means to solve the problem] In the glass spacer paper according to an aspect of the present invention, the number of white foreign objects with a size of 50 μm or less counted by the following measurement method is 10 pieces/269 m ² or less. [Measurement method] (A) Press the glass spacer paper to the glass plate for evaluation (thickness 0.7 mm, size 370 mm×470 mm) (number of times: 100 times, time: 4 seconds/time, pressure: 0.45 MPa, for evaluation Glass plate temperature: 55°C); (B) While transporting the above-mentioned evaluation glass plate (line speed: 200 cm/min) that has been pressed, while supplying pure water (flow rate: 57 L/min), it is used for the above-mentioned evaluation glass A total of 4 roller brushes (roller diameter (inner diameter): 60 mm, roller diameter (outer diameter): 80 mm, hair diameter: 0.06 mm/close roll) are arranged on the upper side of the plate and two on the lower side , material: nylon 612, rotating speed: 300 rpm, distance: up and down 0 mm) to clean the above evaluation glass plate; (C) use the offline defect inspection system (FPI-6000 series (model: FPI6090D) manufactured by Orbotech Company) to inspect All foreign matter on the above-mentioned evaluation glass plate that has been cleaned, and images of all foreign matter are obtained; and (D) Visual observation of the appearance of all the above-mentioned foreign matter based on the above-mentioned image, from among the above-mentioned foreign matter, the size of 50 μm or less The number of white foreign objects was counted. Preferably, in the above-mentioned glass spacer, the number of white foreign objects with a size of 50 μm or less counted by the above-mentioned measurement method is 6 pieces/269 m ² or less. Preferably, in the above-mentioned glass spacer, the number of white foreign matter with a size of 50 μm or less counted by the above-mentioned measuring method is 3 pieces/269 m ² or less. Preferably, in the above-mentioned glass spacer, the content of organic matter measured in accordance with JIS P8224:2002 is 0.08% by mass or less. The glass plate lamination system of another aspect of the present invention is obtained by laminating the above-mentioned glass spacer paper and glass plates alternately. The glass plate package of another aspect of this invention is provided with the said glass plate laminate, and the pallet which mounts the said glass plate laminate. Preferably, the pallet is a pallet on which the glass plate laminates are placed in a flat stacked state. [Effects of the Invention] According to the present invention, it is possible to suppress contamination due to foreign substances transferred from the glass spacer and occurrence of defects in wiring and the like.

本案係基於2015年9月29日提出申請之日本專利申請2015-190848及2016年9月2日提出申請之日本專利申請2016-171847者，其等之內容亦參照之方式併入本文。Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings. The present invention is described by the following preferred embodiments. Changes can be made in many ways without departing from the scope of the present invention, and other embodiments other than this embodiment can be used. Therefore, all changes within the scope of the present invention are included in the claims. Here, parts denoted by the same symbols in the drawings are the same elements having the same functions. Moreover, in this specification, when using "-" to express a numerical range, the numerical value of the upper limit and the lower limit represented by "-" is also included in a numerical range. Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings. As mentioned above, in order to prevent the transfer of foreign matter from the glass spacer paper to the glass plate, causing the pollution of the glass plate surface, the disconnection of the wiring formed on the glass plate surface, etc., the method of reducing the content of foreign matter in the glass spacer paper has been taken before. method. However, according to the study of the inventors of the present invention, in the glass plate for FPD equal to the glass plate on which elements such as wiring and electrodes are formed on the surface, due to the recent increase in size and high definition of displays, even if there was no problem in the past The glass spacer paper with a small number of foreign objects also has a very high probability of wiring and other defects. Therefore, after further research, it was found that by reducing the number of specific foreign objects of 50 μm or less, defects such as disconnection of wiring can be suppressed, and the present invention was achieved. (Glass spacer paper) As the glass spacer paper used in this embodiment, chemical pulp such as kraft pulp (KP, kraft pulp), sulfite pulp (SP, sulfite pulp), and sodium alkali pulp (AP, soda pulp) can be used. ; Semi-chemical pulp (SCP, semi-chemical pulp), chemical groundwood pulp (CGP, chemi groundwood pulp) and other semi-chemical pulp; ground wood pulp (GP), thermomechanical pulp (TMP (thermomechanical pulp), BCTMP), wood chips Mechanical pulp such as RGP (refiner groundwood pulp); non-wood fiber pulp made of mulberry, mitsumami, hemp, kenaf, etc.; and glass spacer paper containing various raw materials such as synthetic pulp. Furthermore, the glass spacer paper of this invention may use these mixtures as a raw material, and may use what contains cellulose etc. as a raw material. Moreover, these raw materials can be waste paper, virgin pulp, or a mixture of waste paper and virgin pulp. Among them, virgin pulp is preferred. In the glass spacer paper of this embodiment, no matter what kind of pulp it is, it is preferable not to use a silicone-based antifoaming agent (containing silicone Defoamer) made of pulp is used as raw material. Among them, pulp produced without using an antifoaming agent containing polydimethylsiloxane is particularly suitable as a raw material for the glass spacer paper of this embodiment. Moreover, it is preferable that content of the organic matter measured based on JISP8224:2002 is 0.08 mass % or less of glass spacers. The lower limit of the content of organic matter is not particularly limited, and is, for example, 0.001% by mass or more. By making the content of organic matter 0.08% by mass or less, transfer of organic matter from the glass spacer to the glass plate can be suppressed. (Measuring method) Next, the measuring method of the foreign matter of the glass spacer will be described. FIG. 1 shows an overall configuration diagram of a measurement device 10 according to an embodiment. FIG. 1(A) shows a pressing device 12 , FIG. 1(B) shows a cleaning device 14 , FIG. 1(C) shows a defect inspection device 16 , and FIG. 1(D) shows a display device 18 . 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 rectangular evaluation glass plate 28 holding the inspection object is adsorbed and detachably attached to the horizontal upper surface of the adsorption pad 26 . Here, the evaluation glass plate 28 has a thickness of 0.7 mm and a size of 370 mm×470 mm. As the evaluation glass plate 28, glass plates for FPDs such as liquid crystal displays (LCD, liquid crystal display), plasma display panels (PDP, Plasma Display Panel), organic electroluminescence (EL, electroluminescence) displays, etc. are exemplified, but are not limited thereto. Here, flat glass plates, such as glass plates for buildings and glass plates for vehicles, are mentioned. The upper platen 22 is arranged to face the lower platen 20 in the vertical direction. In addition, the upper platen 22 is fixed to an unillustrated frame. Also, a plate-shaped suction 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 surface below the level of the suction pad 30 . The ribbon-shaped glass spacer 36 rewound from the following spacer paper supply device (refer to FIG. 2 ) 34 is inserted through the evaluation glass plate parallel to the surface of each of the evaluation glass plate 28 and the dummy glass plate 32 28 and the gap between the dummy glass plate 32. The cylinder device 24 is a fluid cylinder that lifts the lower platen 20 . The cylinder body 38 is fixed on a stand not shown in the figure. Therefore, when the piston 40 expands, the lower platen 20 rises, whereby the evaluation glass plate 28 comes into contact with the glass spacer 36 located above the lower platen 20 . With the continuous upward movement of the lower platen 20 , the glass spacer paper 36 is lifted upwards (in the direction close to the dummy glass plate 32 ), and then is clamped by the evaluation glass plate 28 and the dummy glass plate 32 . Thereby, the evaluation glass plate 28 and the glass spacer 36 are pressed. In addition, when pressing, the glass spacer 36 is supported by the upper platen 22 via the glass plate 32 . Furthermore, 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 ) laminated with the spacer paper in between is reproduced in the package ( FIG. 6 ). form. In addition, by pressing the evaluation glass plate 28 against the glass spacer 36 with a specific pressing force, it is possible to reproduce a load close to that at the time of actual transportation. Furthermore, when the piston 40 is contracted, the lower platen 20 descends in the direction of releasing the pressing force. In addition, in the embodiment, the lower platen 20 is raised and lowered, but the present invention is not limited to this, and it is only necessary to make the lower platen 20 and the upper platen 22 move up and down relative to each other. FIG. 2 is an explanatory diagram showing the pressing operation and the interleaving paper feeding operation performed by the pressing device 12 and the interleaving paper supplying device 34 in chronological order. In fact, when packaging and transporting the glass plate for FPD, generally speaking, the glass spacer paper will be provided by the paper manufacturer in the form of a roll in the required size and shape (approximately similar to the glass plate to be packaged) Rectangular shape) is used in the cut state. In the measuring device 10 of the embodiment, the strip-shaped glass spacer 36 in the state rewound from the state of the roll before cutting is used. The spacer paper supply device 34 is composed of a rotating support part 46 that rotatably supports the spacer paper roll 42 wound into a roll shape around its winding shaft 44, and a glass spacer that winds up a ribbon 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 of the glass spacer 36 is fixed to the winding shaft 54 . At this time, the lower pressure plate 20 is located at the depressing position retracted downward from the depressing position. In the initial setting before the evaluation starts, the glass spacer paper 36 is rewound from the spacer paper roller 42 in the direction of arrow A, wound on the tension roller 50 , and inserted into the gap between the lower platen 20 and the upper platen 22 . Next, the glass spacer 36 is wound around the tension roller 52 , and the front end of the glass spacer 36 is fixed to the take-up shaft 54 of the take-up unit 48 . The take-up shaft 54 transmits the power of the motor 56 to rotate the glass spacer 36 in the same direction as the direction in which it is rewound from the spacer roll 42 (arrow A direction). In this way, the glass spacer 36 is wound up on the winding 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 that presses the evaluation glass plate 28 and the glass spacer paper 36, and the evaluation glass plate The surface of 28 is pressed to glass spacer paper 36. The conditions at this time were 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 so that the lower pressure plate 20 is located at the depressing position retracted downward from the depressing position. Thereafter, the glass spacer 36 is rewound from the spacer roll 42 by the spacer supply device 34 for only one sheet. In addition, although not shown in FIG. 2, the control device which drives and controls the cylinder device 24 and the motor 56 intermittently is provided. This control device is to make the intermittent pressing and pressing release actions of the cylinder device 24 shown by arrows B and C, and the intermittent paper winding action of the motor 56 shown by arrow A to perform multiple times alternately. control in a manner. That is, the control device drives and controls the cylinder device 24 and the motor 56 intermittently so that the step of feeding the separator paper between the separator paper supply device 34 and the step of pressing the cylinder device 24 against the evaluation glass plate 28 are alternately performed multiple times. The operation of winding up one sheet of glass spacer paper 36 refers to the operation of winding up the size of the glass spacer paper 36 used for packaging and transporting the glass plate 28 for evaluation as one sheet. Thereby, the evaluation glass plate 28 is always pressed to a new glass spacer 36 . By repeating the spacer paper winding operation for the spacer paper roll 42 a plurality of times, the foreign object information of the spacer paper roll 42 having a large area can be collected on one evaluation glass plate 28 . In FIG. 2(D), the above operation was repeated 100 times. Although the spacer paper winding operation can be performed repeatedly for the entire length of the spacer paper roll 42 , the time required to collect foreign matter information on one glass plate 28 for evaluation becomes longer. Considering the foreign matter information collected on the evaluation glass plate 28 and the time, in this embodiment, the spacer paper winding action is set to 100 times, that is, the foreign matter information of 100 sheets of glass spacer paper 36 is collected on the evaluation glass plate 28 . Also, when the glass spacer 36 cut with the same size as the evaluation glass plate 28 is used in the pressing device 12 of the embodiment, the glass spacer 36 should be attached to the dummy glass plate of the upper platen 22 32 below the surface. Thereby, the glass spacer 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 glass plate 28 for evaluation with the glass spacer 36 pressed by the pressing device 12, and attaches (transfers) the self-glass spacer 36 to the glass plate 28 for evaluation. Remove foreign matter on the surface. The cleaning device 14 transports the evaluation glass plate 28 at a linear speed of 200 cm/min, supplies pure water from the nozzle 58 at a flow rate of 57 L/min, and makes the upper first roller brush 60, upper second roller brush 62, lower The side first roller brush 64 and the lower side second roller brush 66 cleaned the evaluation glass plate 28 at a rotation speed of 300 rpm (in the same direction as the evaluation glass plate 28 is conveyed). In addition, foreign matter that is difficult to remove during cleaning remains on the surface of the evaluation glass plate 28 without being removed. In the embodiment, the upper first roller brush 60 and the upper second roller brush 62 arranged on the upper side of the evaluation glass plate 28 , and the lower first roller brush 64 and lower side arranged on the lower side of the evaluation glass plate 28 are provided. The second roller brush 66 on the lower side. Moreover, the nozzle 58 which sprays pure water to the surface of the glass plate 28 for evaluation 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 and rotated. All of the upper first roller brush 60, upper second roller brush 62, lower first roller brush 64, and lower second roller brush 66 are the same roller brush. The roller brush is a densely rolled roller brush with a roller diameter (inner diameter) of 60 mm, a roller diameter (outer diameter) of 80 mm, and a hair diameter of 0.06 mm. The hair of the roller brush is made of nylon 612. The so-called dense roll means that the grooved brush after flocking is wound around the roller without gaps. 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. Moreover, the distance L2 of the upper side 1st roller brush 60 and the lower side 1st roller brush 64 was 50 mm. Also, as shown in FIG. 3(A), before the evaluation glass plate 28 passes, the upper first roller brush 60 and the lower first roller brush 64 are arranged at the position where their hairs contact each other, that is, at a distance of 0 mm up and down. Location. Similarly, the upper 2nd roller brush 62 and the lower 2nd roller brush 66 are arrange|positioned at the position where the hair of each contacts, that is, the position of 0 mm up and down. According to the cleaning device 14, while conveying the evaluation glass plate 28 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, upper second roller brush 62, lower The side first roller brush 64 and the lower side second roller brush 66 rotate in the same direction as the conveyance direction of the evaluation glass plate 28 to clean 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 0 mm up and down. 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, Between them, the upper first roller brush 60, upper second roller brush 62, lower first roller brush 64, and lower second roller brush 66 are pressed against each other with a pressure equivalent to the thickness of the evaluation glass plate 28 For evaluation glass plate 28. After the pressing step of the pressing device 12 , the surface of the evaluation glass plate 28 adheres to the surface of the glass spacer 36 , such as dust and paper scraps that can be removed by cleaning, and foreign objects that are difficult to remove by cleaning. The evaluation objects of the glass spacer 36 and the glass plate 28 for evaluation are foreign substances that are difficult to remove by cleaning the surface of the glass plate 28 for evaluation. Thus, in the cleaning step of the cleaning device 14 , 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 Figure 1 (C), the evaluation glass plate 28 after cleaning is transported to the defect inspection device 16 (Orbotech's offline defect inspection system FPI-6000 series (model: FPI6090D). The defect inspection device 16 inspects the glass plate after cleaning. Foreign matter on the surface of the evaluation glass plate 28. The defect inspection device 16 inspects the foreign matter that is difficult to remove on the surface of the evaluation glass plate 28 through light transmission, and obtains images of all foreign matter. Next, as shown in Figure 1 ( As shown in D), the image 80 obtained by the defect inspection device 16 is displayed on the display device 18. Based on the image 80, visually observe the appearance of all foreign objects. From all foreign objects, the white foreign objects with a size of 50 μm or less The number is counted. The lower limit of the size of the white foreign matter is not particularly limited, for example, it is more than 0.1 μm. Next, the measurement method for counting the number of white foreign matter will be described. An off-line defect manufactured by Orbotech Corporation as the defect inspection device 16 is used The inspection system (FPI-6000 series (model: FPI6090D)) inspects all foreign matter on the evaluation glass plate 28 after cleaning, and obtains images of all foreign matter. The conditions when using the offline defect inspection system are shown below. Set the sensitivity For the high-sensitivity mode (2 μm), set the non-measurement area to 10 mm from the end. Furthermore, set the lamp illumination to "30" instead of "66" in the standard sensitivity mode (4 μm). That is, the Compared with the standard sensitivity mode, the lamp illumination is reduced. On the other hand, regarding the setting (threshold value) of the light receiving element side, the effective threshold value of the darker part is set to "30" instead of "15" in the standard sensitivity mode. That is, The threshold value is increased, so compared with the standard sensitivity mode, the brighter part is detected. In addition, the effective threshold value of the brighter part is set to "10" in the same way as "10" in the standard sensitivity mode. Automatically 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 the appearance of all foreign objects is visually observed according to the image 80, and among all foreign objects, 50 μm or less The number of white foreign matter is counted.Here, the so-called "appearance observation by visual inspection" includes taking the scale of the image 80 obtained by the defect inspection device 16 as a reference in different order, and taking the long-diameter direction as the reference. The act of listing foreign matter of 50 μm or less, and the act of listing white foreign matter from among the types of foreign matter shown below. Next, the types of foreign matter of all the evaluation glass plates 28 obtained by the defect inspection device 16 To illustrate. Fig. 4 is the image of the foreign matter obtained by the defect inspection device 16 after the glass spacer paper 36 is pressed to the glass plate 28 for evaluation 100 times and cleaned by the cleaning device 14. The inventors et al. Examining the image obtained by the device 16 and studying the foreign matter, it was found that there are several types of foreign matter. Fig. 4(A) shows black foreign matter (black/small) with a size of 50 μm or less. FIG. 4(B) shows black foreign matter (black/large) with a size larger than 50 μm. FIG. 4(C) shows white foreign matter (white/small) with a size of 50 μm or less. FIG. 4(D) shows white foreign matter (white/large) with a size larger than 50 μm. Fig. 4(E) shows a collection (denseness) of a plurality of foreign objects. FIG. 4(F) shows foreign objects (others) not included in the foreign objects in FIGS. 4(A) to (E). Here, the so-called white foreign matter (white foreign matter) refers to an image captured under the above-mentioned defect inspection conditions as shown in FIG. Foreign bodies in contrasting parts. Also, when there is an aggregate of a plurality of foreign objects in one image, the aggregate is acquired as one foreign object, and its size is judged based on its long-axis direction. The size of foreign matter is classified into foreign matter below 50 μm and foreign matter larger than 50 μm based on the long-axis direction. Also, for example, when counting the number of all foreign matter on two different glass spacers, there may be cases where the total number of foreign matter is approximately the same, but the number of white foreign matter with a size of 50 μm or less on one glass spacer is The number of white foreign objects whose size is less than 50 μm of another glass spacer. Also, for the other two different glass spacers, even if the total number of foreign matter in one glass spacer is less than the total number of foreign matter in the other glass spacer, the number of white foreign matter with a size of 50 μm or less is also equal to that of glass spacer. The number of spacers is more than the number of another glass spacer. Furthermore, the lower limit of the number of white foreign matter is not particularly limited, for example, it is 1 piece/269 m ² or more. That is, the number of objects of white foreign objects with a size of 50 μm or less in the total number of foreign objects differs for each glass spacer. The inventors focused on the number of white foreign objects with a size of 50 μm or less rather than the total number of foreign objects, and found that glass spacers with less white foreign objects with a size of 50 μm or less can suppress the occurrence of defects such as disconnection of the glass plate . This result is demonstrated in the following Example. After the analysis of the white foreign matter, it is mainly so-called artificial organic matter such as PET (polyethylene terephthalate) or nylon, EVA (ethylene-vinyl acetate copolymer resin). It is considered that the artificial organic matter is in contact with the paper raw material liquid or wet paper when the paper raw material liquid passes through the plastic thread used in the thread part, or when the wet paper is mechanically pressed and dehydrated in the press part through a set of rollers and felts. when mixed in. The inventors, etc. have studied diligently and found that the influence of the contact member called the canvas tape is particularly large as the cause of the generation of the white foreign matter. (Manufacturing method of glass spacer paper) FIG. 5 is a schematic configuration diagram of a paper machine 100 for producing glass spacer paper. As shown in FIG. 5 , a raw material liquid for glass spacer paper (a liquid obtained by diluting pulp with water) is supplied in a sheet form from a front tank 112 onto the wire 116 provided under the wire portion 114 . The paper raw material solution supplied to the lower thread 116 is then sandwiched between the lower thread 116 and the upper thread 118 to spread and dehydrate with a uniform thickness to become wet paper (paper). The lower thread 116 and the upper thread 118 of the thread portion 114 are penetrating films formed in an endless strip shape. In particular, they are nets made of plastic or metal material, or endless belts made of felt containing natural or synthetic fibres. The lower wire 116 and the upper wire 118 are stretched over a plurality of rollers, and transmit the driving force of a motor (not shown) to the driving roller among the plurality of rollers, thereby moving around at a specific speed. The wet paper formed in the line part 114 is conveyed to the press part 120 having a press roll, an endless belt-shaped felt, and a pair of press rolls, where further dehydration and pressing are carried out at the same time. The wet paper passing through the press section 120 is conveyed to the dryer section 124 constituted by a plurality of rolls, and is dried in an environment of, for example, about 120° C. while passing through the dryer section 124 . When passing through the dryer unit 124, if the wet paper is directly conveyed at high speed, there is a risk of paper breakage, so the wet paper is conveyed in a state where an auxiliary member called a canvas belt is in contact with the wet paper. In order to obtain a glass plate with less white foreign matter like this embodiment, it is preferable to carry out as follows. That is, it can be mentioned that so-called artificial organic substances such as PET (polyethylene terephthalate) or nylon, EVA (ethylene-vinyl acetate copolymer resin) are not used for the material constituting the canvas tape, or the use of canvas tape Replace before deterioration, or coat the surface of the canvas with cellulose or SiO ₂ that cannot become white foreign matter, etc. The paper dried by the dryer unit 124 is conveyed to the calendering unit 126, and is subjected to calendering treatment by nip and conveyance of calender rolls to smooth the front and back sides. Furthermore, if necessary, a coating section may be provided between the dryer section 124 and the calender section 126 to apply a paint or the like to the surface of the smoothed paper. The paper subjected to the calendering process in the calendering unit 126 is wound up on the reel 128 as a glass spacer paper, and is formed in a roll shape (hereinafter referred to as a jumbo roll 130 ). Regarding the glass spacer paper formed as the jumbo roll 130, usually, for example, the glass spacer paper is cut into a width corresponding to the product and rolled up to form a long strip of glass spacer paper with a specific length of about 8000 to 10000 m. There is a paper roll 42 between them. That is, generally, the glass spacer paper is divided into small parts from the jumbo roll 130 and used. The glass spacer paper is sent out from the jumbo roll 130 , cut into a specific width (cut along the length direction) by a cutter 134 , and wound up by a winder 136 . The glass spacer paper sent out from the jumbo roll 130 is cut into a specific length (cutting along the width direction) by the cutter 134 at the time point when it becomes a specific length, forming a long strip of glass spacer paper with a specific width. A spacer roll 42 is formed. The elongated glass spacer paper wound into the spacer paper roll 42 is cut into slices (rectangular shapes) of a size corresponding to the laminated glass plates, and interposed between the laminated glass plates. In the paper machine 100 (paper manufacturing step) for glass spacer paper, when preparing the paper raw material liquid supplied to the front tank 112, it is preferable to use pulp with less white foreign matter as the pulp sheet used as the raw material. For example, the number of objects of the white foreign matter on the pulp sheet is counted by the same method as the measurement method implemented on the above-mentioned glass spacer. The pulp sheet is screened according to the number of white foreign matter, so the pulp sheet with less white foreign matter can be used. In the manufacturing process of the pulp sheet, artificial organic substances may adhere to the pulp sheet when it comes into contact with the resin member. Furthermore, there is a problem that artificial organic matter of the pulp sheet is mixed into the glass spacer. Furthermore, it is preferable that the content of the artificial organic matter in a pulp sheet is 0.08 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 can be reduced. Here, artificial organic matter refers to the resin component in the pulp sheet measured based on JIS P8224:2002. It is better to use pulp with less white foreign matter to produce glass spacer paper with less white foreign matter. When counting the number of white foreign objects with a pulp sheet, the number of white foreign objects with a size of 50 μm or less is preferably 200 pieces/m ² or less. In order to reduce the incorporation of organic matter in the papermaking step, it is preferable to remove the resin burrs of the resin member used in the papermaking step and in contact with the paper raw material liquid or wet paper. Since the resin burrs are easy to fall off and are easily mixed into the paper stock solution or wet paper, it is effective to remove the resin burrs. Moreover, it is preferable to perform weak alkali cleaning or weak acid cleaning in all piping steps before papermaking. Its purpose is to suppress the incorporation of organic substances generated in the manufacture of other spacers when newly manufacturing glass spacers. It is difficult to manufacture a glass spacer with less white foreign matter unless thorough management has not been carried out as described above. (Glass Plate Package) The glass plate package of this embodiment has a glass plate laminate in which glass spacers and glass plates are alternately laminated, and a pallet on which the glass plate laminate is placed. An example of the glass plate package is conceptually shown in FIG. 6 . In addition, FIG. 6 is the figure (side view) which looked at the glass plate package body from the side direction of glass. A glass plate package 250 shown in FIG. 6 includes a glass plate laminate 262 in which glass spacers 260 and glass plates G are alternately laminated, and a pallet 252 on which the glass plate laminate 262 is placed. The pallet 252 is a known pallet for packing glass plates, and has a base 254 , an inclined table 256 erected on the upper surface of the base 254 , and a mounting table 258 placed on the upper surface of the base 254 . One surface in the horizontal direction of the tilt table 256 (the contact surface with the glass plate G = the back surface) is inclined with respect to the vertical direction (hereinafter also referred to as an inclined surface). The angle of the inclined surface should only be an angle at which the laminated glass sheets G can be stably stacked, stored and transported, and is usually 85° or less with respect to the horizontal direction, for example, preferably 85° to 70°. In addition, the upper surface of the mounting table 258 is inclined so as to descend toward the inclined table 256 with respect to the horizontal direction. In the illustrated example, as an example, it is configured such that the upper surface of the mounting table 258 forms an angle of 90° with respect to the inclined surface of the inclined table 256 . On the pallet 252 , the glass plate G is placed on the upper surface of the mounting table 258 , and is stacked in a state of leaning against the inclined surface of the inclined table 256 . Moreover, between the glass plates G, the glass spacer 260 of this embodiment is interposed. The glass spacer 260 is larger in size than the glass plate G, and is interposed between the glass plates G so as to cover the entire surface of the glass plate G. As shown in FIG. Furthermore, the size of the glass plate G is preferably more than 2200 mm×1800 mm. In this way, when the size of the glass plate is large, the occurrence rate of defects such as disconnection of wiring becomes high, so the glass spacer of this embodiment can be preferably used. Furthermore, the size of the glass plate G is preferably 2400 mm×2100 mm. The size of the glass spacer is preferably the same as the size of the glass plate or larger than the size of the glass plate, especially preferably larger in both length and width, 20 mm or more. Furthermore, the glass spacer 260 may be similarly interposed between the laminated glass plate G and the tilt table 256, and the surface of the front glass plate G may also be covered with the glass spacer 260 in the same manner. The glass plate package body 250 is formed as mentioned above. In this case, if necessary, the protective plate may also be brought into contact with the front glass plate G (glass spacer), and the belt-shaped body may be erected and fixed to the tilt table 256, and all the glass plates G may be covered. And put on the hood. In addition, the glass plate package body of this invention is not limited to the glass plate G leaning and stacking (so-called vertical stacking) like the glass plate package body 250 shown in FIG. The glass plate package may use a pallet for horizontally stacking glass plates G (so-called flat stacking) like the plate-shaped body storage container shown in Japanese Utility Model Registration No. 3165973, for example. In the case of flat stacking, the load acting on the glass plate near the bottom and the glass spacer becomes larger, so foreign matter is easily transferred from the glass spacer to the glass plate, so that it is impossible to stack more pieces, but by using this The glass spacer of the embodiment can be stacked with more pieces. Specifically, even when the glass spacer is pressed against the glass plate with a surface pressure of 30 g/cm ² or more of load per unit area, foreign matter transferred from the glass spacer can be suppressed. In the glass plate package body of this embodiment, various well-known glass plates are illustrated as the glass plate G. Among them, a glass plate on which elements such as wiring and electrodes as described above are formed on the surface is preferred, and a glass plate for FPD is particularly preferred. As mentioned above, the glass spacer paper, the glass plate laminate, and the glass plate packing body have been described in detail, but the present invention is not limited to the above-mentioned examples, and of course various improvements or improvements are possible without departing from the gist of the present invention. change. [Examples] Hereinafter, the present invention will be described in more detail by examples, but the present invention is not limited by these examples. EXAMPLE 1 Using the paper machine of the general glass spacer paper shown in FIG. 5, the glass spacer paper was produced using virgin pulp (pulp sheet) as a raw material. A pulp sheet having an organic matter content of 0.08% by mass or less as measured in accordance with JIS P8224:2002 and a visually observed white foreign matter of 0.14 pieces/m ² or less was used as a raw material. For the glass spacer paper made from the pulp sheet: (A) Press the glass spacer paper to the glass plate for evaluation (thickness 0.7 mm, size 370 mm×470 mm) (number of times: 100 times, time: 4 seconds/ times, pressure: 0.45 MPa, temperature of the glass plate for evaluation: 55°C); (B) While transporting the glass plate for evaluation that has been pressed (line speed: 200 cm/min), pure water is supplied on the other hand (flow rate: 57 L/min ), using a total of 4 roller brushes (roller diameter (inner diameter): 60 mm, roller diameter (outer diameter): 80 mm, hair diameter : 0.06 mm/coil, material: nylon 612, rotating speed: 300 rpm, distance: 0 mm up and down) to clean the above glass plate for evaluation; (C) use the offline defect inspection system manufactured by Orbotech (FPI-6000 series (model : FPI6090D)) to inspect all foreign objects on the cleaned evaluation glass plate, and obtain images of all foreign objects; After counting the number of large and small white foreign objects, the total number of foreign objects on the glass spacer is 32/269 m ² , and the number of white foreign objects below 50 μm is 10/269 m ² . [Example 2] As a raw material, a pulp sheet whose organic matter content measured according to JIS P8224:2002 is 0.05% by mass or less, and whose white foreign matter is visually observed is 0.1 pieces/m ² or less is used. 1 Make a glass spacer in the same way. In the glass spacer paper made from this pulp sheet, after counting the number of white foreign matter with a size of 50 μm or less among all the foreign matter, the total number of foreign matter was 25 pieces/269 m ² , and the white foreign matter with a size of 50 μm or less was counted. The number of foreign objects was 6/269 m ² . [Example 3] As a raw material, a pulp sheet whose organic matter content measured according to JIS P8224:2002 is 0.01% by mass or less, and whose white foreign matter is visually observed is 0.05 pieces/m ² or less is used. 1 Make a glass spacer in the same way. In the glass spacer made of this pulp sheet, after counting the number of white foreign matter with a size of 50 μm or less among all the foreign matter, the total number of foreign matter was 24 pieces/269 m ² , and the white foreign matter with a size of 50 μm or less was counted. The number of foreign objects was 3/269 m ² . [Comparative Example 1] As a raw material, a pulp sheet whose organic matter content measured according to JIS P8224:2002 is 0.1% by mass or less, and whose white foreign matter is visually observed is 0.3 pieces/ ^m2 or less is used, and the cleaning of the resin member is not performed. A glass spacer paper was produced in the same manner as in Example 1 except that papermaking was performed following the treatment. In the glass spacer made of this pulp sheet, the total number of foreign matter was 40 pieces/269 m ² after counting the number of white foreign matter with a size of 50 μm or less from all the foreign matter, and the white foreign matter with a size of 50 μm or less The number of foreign objects was 15/269 m ² . [Performance evaluation] The glass spacers produced in the above Examples 1-3 and Comparative Example 1 were interposed between glass plates for FPDs with a thickness of 0.5 mm and a size of 2500×2200 mm to form a laminate of multiple glass plates Made of glass plate laminate. This glass plate laminate was mounted on the pallet shown in FIG. 6 (2000 glass plates) stacked vertically on each of the glass spacers of Examples 1 to 3 and Comparative Example 1, and a glass plate package was produced. The glass plate package was stored for 10 days. After taking out the glass plate from the glass package and cleaning the glass plate, a linear wiring with 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 checked. Using 2000 glass plates, the case where 20 or less disconnection defects occurred was evaluated as ○, and the case where more than 20 disconnection defects occurred was evaluated as x. Table 1 shows the measurement results and evaluation results. According to Table 1, when the number of white foreign objects with a size of 50 μm or less is 10 pieces/269 m ² or less, the evaluation results are all ○. When there were more than 10 white foreign objects with a size of 50 μm or less per 269 m ² , the evaluation results were all ×. From this result, it can be understood that the number of white foreign objects with a size of 50 μm or less is related to defects such as disconnections occurring on the glass plate. It can be inferred that foreign matter larger than 50 μm will be removed when cleaning the glass plate. On the other hand, white foreign matter below 50 μm is difficult to remove during cleaning. Accordingly, by setting the number of white foreign objects with a size of 50 μm or less to 10 pieces/269 m ² or less, defects such as disconnection on the glass plate can be suppressed. [Table 1]

This case is based on Japanese patent application 2015-190848 filed on September 29, 2015 and Japanese patent application 2016-171847 filed on September 2, 2016, the contents of which are also incorporated herein by reference.

10‧‧‧measurement device 12‧‧‧press device 14‧‧‧Cleaning device 16‧‧‧Defect inspection device 18‧‧‧display device 20‧‧‧Lower pressure plate 22‧‧‧upper platen 24‧‧‧Cylinder device 26‧‧‧Absorptive pad 28‧‧‧Evaluation glass plate 30‧‧‧Absorptive pad 32‧‧‧glass plate 34‧‧‧Interval paper supply device 36‧‧‧Glass spacer 38‧‧‧Cylinder body 40‧‧‧piston 42‧‧‧Interval Paper Roller 44‧‧‧Winding shaft 46‧‧‧rotation support 48‧‧‧Coiling Department 50‧‧‧tension roller 52‧‧‧tension roller 54‧‧‧Coiling shaft 56‧‧‧motor 58‧‧‧Nozzle 60‧‧‧The first roller brush on the upper side 62‧‧‧The second roller brush on the upper side 64‧‧‧The first roller brush on the lower side 66‧‧‧The second roller brush on the lower side 80‧‧‧images 100‧‧‧paper machine 112‧‧‧Front groove 114‧‧‧Line Department 116‧‧‧offline 118‧‧‧online 120‧‧‧press section 124‧‧‧Desiccator Department 126‧‧‧Calendering Department 128‧‧‧Reels 130‧‧‧Jumbo roller 134‧‧‧Cutter 136‧‧‧winding machine 250‧‧‧glass plate package body 252‧‧‧Pallet 254‧‧‧abutment 256‧‧‧Tilt table 258‧‧‧Placing table 260‧‧‧Glass spacer 262‧‧‧Glass plate laminate G‧‧‧Glass plate L1‧‧‧distance L2‧‧‧distance

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

10‧‧‧measurement device

12‧‧‧press device

14‧‧‧Cleaning device

16‧‧‧Defect inspection device

18‧‧‧display device

20‧‧‧Lower pressure plate

22‧‧‧upper platen

24‧‧‧Cylinder device

26‧‧‧Absorptive pad

28‧‧‧Evaluation glass plate

30‧‧‧Absorptive pad

32‧‧‧glass plate

36‧‧‧Glass spacer

38‧‧‧Cylinder body

58‧‧‧Nozzle

60‧‧‧The first roller brush on the upper side

62‧‧‧The second roller brush on the upper side

64‧‧‧The first roller brush on the lower side

66‧‧‧The second roller brush on the lower side

80‧‧‧images

Claims (9)

A glass spacer, which is counted by the following measurement method and the number of white foreign objects with a size of 50 μm or less is 10 pieces/269m ² or less, and the glass spacer is measured by using JIS P8224:2002 The pulp sheet with an organic content of 0.08% by mass or less and a visually observed white foreign matter of 0.14 pieces/ ^m2 or less is used as a raw material. [Measurement method] (A) Press the glass spacer paper onto the glass plate for FPD (thickness 0.7mm, size 370mm×470mm) (number of times: 100 times, time: 4 seconds/time, pressure: 0.45MPa, glass plate temperature for FPD: 55°C); plate (line speed 200cm/min), pure water (flow rate: 57L/min) is supplied to one side, and a total of 4 roller brushes (roller brushes) with 2 on the upper side and 2 on the lower side of the above-mentioned glass plate for FPD are used. Diameter (inner diameter): 60mm, roller diameter (outer diameter): 80mm, gross diameter: 0.06mm/coil, material: nylon 612, speed: 300rpm, distance: up and down 0mm) to clean the above glass plate for FPD; (C ) Use the offline defect inspection system (FPI-6000 series (model: FPI6090D)) manufactured by Orbotech to inspect all foreign objects on the above-mentioned FPD glass plate that has been cleaned, and obtain images of all foreign objects; and (D) according to the above images All the above-mentioned foreign matter was visually observed for appearance, and the number of white foreign matter with a size of 50 μm or less was counted among all the above-mentioned foreign matter. The glass spacer according to claim 1, wherein the number of white foreign objects with a size of 50 μm or less counted by the above-mentioned measuring method is 6 pieces/269m ² or less. The glass spacer paper according to claim 2, wherein the number of white foreign objects with a size of 50 μm or less counted by the above-mentioned measuring method is 3 pieces/269m ² or less. The glass spacer paper according to any one of claims 1 to 3, wherein the content of organic matter measured in accordance with JIS P8224:2002 is 0.08% by mass or less. The glass spacer according to any one of Claims 1 to 3, which is a glass spacer used for a glass plate of 2200mm×1800mm or more, and the size of the above glass spacer is the same as that of the above glass plate, or larger than the above glass board size. The glass spacer paper according to any one of Claims 1 to 3, which is a glass spacer paper used for a glass plate of 2200mm×1800mm or more, and the size of the glass spacer paper is larger than the size of the glass plate by more than 20mm in both vertical and horizontal directions. A glass plate laminate, which is formed by alternately laminating the glass spacer paper and glass plates according to any one of Claims 1 to 6. A glass plate package comprising the glass plate laminate according to claim 7, and a pallet on which the glass plate laminate is placed. The glass plate package according to claim 8, wherein the pallet is a pallet on which the glass plate laminate is placed in a flat stacked state.

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