JP6671639B2 - Glass interleaving paper, glass plate laminate, and glass plate package - Google Patents

Description

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

  Glass sheets for FPD (Flat Panel Display), such as glass sheets for construction, glass sheets for automobiles, glass sheets for plasma displays, and glass sheets for liquid crystal displays, have scratches on the surface during storage or transportation, Product defects may occur due to contamination by contaminants in the atmosphere.

  In particular, a glass plate (glass substrate) for FPD has fine electric wiring (hereinafter also referred to as wiring), an electrode, an electric circuit, a partition, and other elements formed on the surface, so that a slight flaw or contamination on the surface is obtained. Even if there is, it may cause a defect such as disconnection. Therefore, glass plates used in these applications are required to have high surface cleanliness.

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

  At this time, so-called glass interleaving paper is interposed between the glass plates to separate the surfaces of adjacent glass plates from each other, thereby preventing flaws on the surface of the glass plates and contamination by contaminants in the atmosphere.

  However, in the method of interposing a glass sheet between glass plates, the glass sheet and the surface of the glass plate come into direct contact with each other. Therefore, various components (foreign matter) such as resin existing on the surface of the glass interleaf are transferred to the surface of the glass plate. If glass interleaving paper having many foreign substances on its surface is used, problems such as paper texture, scorching, and dirt are likely to occur on the glass plate. In addition, it causes defects such as disconnection of fine wiring formed on the surface of the glass plate. It is difficult to completely remove such foreign matter from the surface of the glass plate even after cleaning.

  As a method for solving the above problem, for example, Patent Literature 1 discloses a glass sheet package in which glass sheets are packed using glass slip paper having a content of higher saturated fatty acids of 0.08% by mass or less. ing.

  Patent Literature 2 discloses a glass slip sheet having a content of an organic compound having a silicon element of 3 ppm or less.

International Publication No. 2011/118502 International Publication No. WO 2014/098162

  In Patent Literatures 1 and 2, by reducing the content of foreign substances contained in the glass slip sheet, the occurrence of contamination on the surface of the glass plate and the occurrence of defects such as disconnection of wiring formed on the surface of the glass plate are suppressed. doing.

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

  The present invention has been made in view of such circumstances, and a glass interleaf that can sufficiently suppress the occurrence of contamination and defects such as wiring due to foreign matters transferred from the glass interleaf, and a glass interleaf that can suppress the occurrence of defects such as wiring. An object of the present invention is to provide a glass plate laminate using paper and a glass plate package.

In the glass slip sheet according to one embodiment of the present invention, the number of white foreign substances having a size of 50 μm or less counted by the following measurement method is 10/269 m ² or less.

[Measuring method]
(A) Glass interleaf paper (number of times: 100 times, time: 4 seconds / time, pressure: 0.45 MPa, glass plate for evaluation) on a glass plate for evaluation (a size of 370 mm × 470 mm with a thickness of 0.7 mm) (Temperature: 55 ° C.) and (B) pure water is supplied (flow rate: 57 L / min) while the pressed glass plate is conveyed (line speed 200 cm / min). Roll brushes (roll diameter (inner diameter): φ60, roll diameter (outer diameter): φ80, bristle diameter: 0.06 mm / close winding, material: two on the upper side and two on the lower side) : Nylon 612, rotation speed: 300 rpm, distance: 0 mm above and below), the glass plate for evaluation was washed, and (C) an off-line defect inspection system (FPI-6000 series (model number: FPI6090D) manufactured by Orbotech) was used. Inspection of all the foreign substances on the cleaned glass plate for evaluation, obtaining an image of all the foreign substances, and (D) visually observing the appearance of all the foreign substances based on the image, and selecting 50 μm or less from the total foreign substances. The number of white foreign substances having a size of is counted.

Preferably, the number of white foreign substances having a size of 50 μm or less, which is glass interleaving paper and counted by the measurement method, is 6/269 m ² or less.

Preferably, the number of white foreign substances having a size of 50 μm or less, which is glass interleaving paper and counted by the measurement method, is 3/269 m ² or less.

Preferably, it is glass interleaving paper, and the content of the organic substance measured according to JIS P8224: 2002 is 0.08% by mass or less.

  A glass plate laminate according to another aspect of the present invention is a glass plate laminate obtained by alternately laminating the glass interleaving paper and the glass plate.

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

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

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the contamination resulting from the foreign material transferred from glass interleaving paper, and the defect of wiring etc. can be suppressed.

1 (A) to 1 (D) are overall configuration diagrams of a measuring device. 2 (A) to 2 (D) are explanatory diagrams showing the interleaving paper supply operation and the pressing operation by the pressing device and the interleaf paper supply device over time. FIGS. 3A and 3B are explanatory diagrams showing a state when the evaluation glass plate passes through the cleaning device. 4A to 4F are images acquired by the defect inspection device. FIG. 5 is a schematic configuration diagram of a paper machine for making glass interleaving paper. FIG. 6 is a diagram conceptually illustrating an example of a glass plate package.

  Hereinafter, preferred embodiments of the present invention will be described with reference to 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 invention, and other embodiments other than this embodiment can be used. Accordingly, all modifications within the scope of the present invention are included in the appended claims.

  Here, parts denoted by the same symbols in the drawings are similar elements having similar functions. Further, in the present specification, when a numerical range is expressed by using “”, upper and lower numerical values 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, foreign substances are transferred from the glass interleaf to the glass plate, and contamination of the surface of the glass plate, disconnection of wiring formed on the surface of the glass plate, and other defects are suppressed. It has been practiced to reduce the content of foreign substances therein.

  However, according to the study of the present inventors, in a glass plate such as a glass plate for an FPD on which elements such as wirings and electrodes are formed on the surface, conventionally, due to the recent increase in size and high definition of the display, the conventional technology has been proposed. Even in the case of glass interleaf paper in which the number of foreign substances in which no problem occurred was small, defects such as wiring occurred with a probability that was not low. Therefore, as a result of further study, they have found that the number of specific foreign substances having a size of 50 μm or less is reduced to thereby suppress defects such as disconnection of wirings, and have reached the present invention.

(Glass insert)
Chemical pulp such as kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP); semi-chemical pulp (SCP), and chemical ground wood pulp (CGP) are used as glass interleaf paper used in the present embodiment. Semi-chemical pulp; mechanical pulp such as groundwood pulp (GP), thermomechanical pulp (TMP, BCTMP), refiner ground wood pulp (RGP); Glass paper made of various raw materials such as synthetic pulp; can be used. Further, the glass interleaving paper of the present invention may be a mixture of these as a raw material, or a mixture containing cellulose or the like.

  These raw materials may be used paper, virgin pulp, or a mixture of used paper and virgin pulp. Among them, virgin pulp is preferred.

  In the glass interleaf paper of this embodiment, any of the pulp is a silicone-based defoaming agent (a defoaming agent containing silicone), which is a major cause of defects in wiring and electrodes when transferred to a glass plate. It is preferable to use pulp produced without using the agent) as a raw material.

  Above all, pulp produced without using an antifoaming agent containing polydimethylsiloxane is particularly preferably used as a raw material of the glass interleaf paper of the present embodiment.

Further, the glass interleaving paper preferably has an organic matter content of 0.08% by mass or less measured in accordance with JIS P8224: 2002. The lower limit of the content of the organic substance is not particularly limited, but is, for example, 0.001% by mass or more. When the content of the organic substance is 0.08% by mass or less, the transfer of the organic substance from the glass interleaving paper to the glass plate can be suppressed.

(Measuring method)
Next, a method for measuring foreign matter in glass slip paper will be described. FIG. 1 shows an overall configuration diagram of a measuring apparatus 10 according to the embodiment.

  1A shows the pressing device 12, FIG. 1B shows the cleaning device 14, FIG. 1C shows the defect inspection device 16, and FIG. 1D shows the display device 18. ing.

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

  Examples of the evaluation glass plate 28 include a glass plate for FPD such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic electroluminescence (EL) display, but are not limited thereto. A flat glass plate including a glass plate, a glass plate for a vehicle, and the like can also be given.

  The upper stool 22 is arranged to face the lower stool 20 in the up-down direction. The upper stool 22 is fixed to a frame (not shown). A plate-like suction pad 30 is attached to the lower surface of the upper stool 22, and a dummy glass plate 32 is detachably suction-held on a horizontal lower surface of the suction pad 30.

  The strip-shaped glass interleaving paper 36 unwound from the interleaf paper supply device 34 (see FIG. 2) described later is placed in the gap between the evaluation glass plate 28 and the dummy glass plate 32 and the evaluation glass plate 28 and the dummy glass plate 32. Is inserted in parallel with each surface of the glass plate 32.

  The cylinder device 24 is a fluid cylinder that raises and lowers the lower platen 20. The cylinder body 38 is fixed to a pedestal (not shown), and the upper end of a piston 40 that expands and contracts with respect to the cylinder body 38 is fixed to the lower surface of the lower platen 20. Have been.

  Therefore, when the piston 40 is extended, the lower platen 20 rises, and the evaluation glass plate 28 comes into contact with the glass interleaf 36 located above the lower platen 20. The glass interleaf 36 is lifted upward (in a direction approaching the dummy glass plate 32) by the continued upward movement of the lower platen 20, and then pressed between the evaluation glass plate 28 and the dummy glass plate 32. Thereby, the evaluation glass plate 28 and the glass interleaf 36 are pressed. At the time of pressing, the glass interleaf 36 is supported on the upper platen 22 via the glass plate 32. Further, the glass interleaf 36 is sandwiched between the evaluation glass plate 28 and the dummy glass plate 32 to form a glass plate laminate (FIG. 6) laminated on the package (FIG. 6) via the interleaf. Is reproduced. Further, by pressing the evaluation glass plate 28 against the glass interleaf paper 36 with a predetermined pressing force, a load close to the time of actual transportation can be reproduced. Further, when the piston 40 is contracted, the lower platen 20 descends in a direction to remove the pressing.

  In the embodiment, the lower platen 20 is moved up and down. However, the present invention is not limited to this. The lower platen 20 and the upper platen 22 may be moved up and down relatively.

  FIG. 2 is an explanatory diagram showing the pressing operation and the interleaf paper supply operation by the pressing device 12 and the interleaf paper supply device 34 over time.

  When actually packaging and transporting a glass plate for FPD, glass interleaf generally has a desired size and shape (generally similar to the glass plate to be packaged) provided in a roll form from a paper maker or the like. It is used in the state cut into a rectangular shape. In the measuring device 10 of the embodiment, a band-shaped glass slip sheet 36 in a state of being unwound from a roll state before cutting is used.

  The slip sheet supply device 34 includes a rotation support portion 46 that rotatably supports the slip sheet roll 42 wound in a roll shape about the winding shaft 44, and a band-shaped glass slip sheet 36 from the slip sheet roll 42. And a take-up section 48 for taking up.

  As shown in FIG. 2A, the leading end of the glass slip sheet 36 is fixed to the winding shaft 54. At this time, the lower platen 20 is located at the pressure removing position retracted downward from the pressing position.

  In the initial setting before the start of the evaluation, the glass interleaf 36 is rewound in the direction of arrow A from the interleaf roll 42, is wound around the tension roller 50, and is inserted into the gap between the lower platen 20 and the upper platen 22. It is inserted. Then, the glass insert 36 is wound around the tension roller 52, and the leading end of the glass insert 36 is fixed to the winding shaft 54 of the winding section 48. The power of the motor 56 is transmitted to the winding shaft 54, and the winding shaft 54 is rotated in the same direction as the direction in which the glass slip sheet 36 is rewound from the slip sheet roll 42 (the direction of the arrow A). In this way, the glass interleaf 36 is wound around 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 arrow B pressing the evaluation glass plate 28 and the glass interleaf 36 so that the glass is removed. The surface of the evaluation glass plate 28 is pressed against the slip sheet 36. The conditions at this time are 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. 2C, the piston 40 of the cylinder device 24 is contracted, and the lower platen 20 is positioned at the pressure removing position retracted downward from the pressing position. Thereafter, the interleaf paper supply device 34 rewinds the glass interleaf 36 from the interleaf roll 42 by one sheet.

  Although not shown in FIG. 2, a control device for intermittently controlling the driving of the cylinder device 24 and the motor 56 is provided. This control device alternately performs the intermittent pressing and releasing operation of the cylinder device 24 indicated by arrows B and C and the intermittent take-up operation of one sheet by the motor 56 indicated by arrow A alternately a plurality of times. Control. That is, the control device controls the cylinder device 24 and the motor 56 so that the slip sheet supply process by the slip sheet supply device 34 and the pressing process by the cylinder device 24 are alternately performed a plurality of times on the evaluation glass plate 28. Drive control intermittently.

  The take-up operation for one sheet of the glass sheet 36 is performed when the size of the glass sheet 36 used for packaging and transporting the evaluation glass plate 28 is set to one sheet, and the one sheet is wound. Take action. As a result, the evaluation glass plate 28 is always pressed against the new glass interleaf 36. By repeating the interleaf take-up operation on the interleaf roll 42 a plurality of times, the foreign substance information of the large interleaf roll 42 can be collected on one evaluation glass plate 28.

  In FIG. 2D, the above operation is repeated 100 times.

  Although the interleaf take-up operation for the entire length of the interleaf roll 42 can be repeated, the time required for collecting the foreign substance information on one evaluation glass plate 28 becomes longer. In consideration of the foreign substance information and time gathered on the evaluation glass plate 28, in the present embodiment, the slip sheet take-up operation is performed 100 times, that is, the foreign substance information for 100 sheets of the glass insert paper 36 is transferred to the evaluation glass plate 28. They are being aggregated.

  In the case where the pressing device 12 of the embodiment uses the glass interleaf 36 cut to the same size as the evaluation glass plate 28, the glass interleaf 36 is placed on the lower surface of the dummy glass plate 32 of the upper stool 22. 36 may be attached. As a result, the glass interleaf 36 is supported by the upper stool 22 via the dummy glass plate 32.

  The cleaning device 14 shown in FIG. 1B cleans the surface of the evaluation glass plate 28 on which the glass interleaf 36 is pressed by the pressing device 12 and adheres to the surface of the evaluation glass plate 28 from the glass interleaf 36 ( The transferred foreign matter is removed.

  In the cleaning device 14, while conveying the evaluation glass plate 28 at a line speed of 200 cm / min, pure water is supplied from the nozzle 58 at a flow rate of 57 L / min, and the upper first roll brush 60 and the upper second roll brush 62. The lower first roll brush 64 and the lower second roll brush 66 are cleaned at a rotation speed of 300 rpm (in the same direction as the transport direction of the evaluation glass plate 28). Note that foreign substances that are difficult to remove by cleaning cannot be removed and remain on the surface of the evaluation glass plate 28.

  In the embodiment, the upper first roll brush 60 and the upper second roll brush 62 disposed above the evaluation glass plate 28, the lower first roll brush 64 disposed below the evaluation glass plate 28, and A lower second roll brush 66 is provided. A nozzle 58 for injecting pure water onto the surface of the evaluation glass plate 28 is provided.

  The upper first roll brush 60, the upper second roll brush 62, the lower first roll brush 64, and the lower second roll brush 66 are rotated in contact with the surface of the evaluation glass plate.

  The upper first roll brush 60, the upper second roll brush 62, the lower first roll brush 64, and the lower second roll brush 66 are all the same roll brush. The roll brush is a close-wound roll brush having a roll diameter (inner diameter) of 60φ, a roll diameter (outer diameter) of 80φ, and a bristle diameter of 0.06 mm. The bristles of the roll brush are made of nylon 612. Close winding means that the planted channel brush is wound around the roll without any gap.

  As shown in FIG. 3A, the distance L1 between the upper first roll brush 60 and the upper second roll brush 62 is 200 mm. The distance L2 between the upper first roll brush 60 and the lower first roll brush 64 is 50 mm.

  Further, as shown in FIG. 3A, before the evaluation glass plate 28 passes, the upper first roll brush 60 and the lower first roll brush 64 are located at positions where their hairs come into contact with each other, that is, It is arranged at a position of 0 mm vertically. Similarly, the upper second roll brush 62 and the lower second roll brush 66 are arranged at positions where the respective bristles come into contact, that is, at positions of 0 mm vertically.

  According to the cleaning device 14, while conveying the evaluation glass plate 28 in the direction of arrow D, pure water is supplied from the nozzle 58 to the surface of the evaluation glass plate 28, and the upper first roll brush 60 and the upper second roll The surface of the evaluation glass plate 28 is cleaned by rotating the brush 62, the lower first roll brush 64, and the lower second roll brush 66 in the same direction as the transport direction of the evaluation glass plate 28.

  As shown in FIG. 3A, the distance between the upper first roll brush 60 and the lower first roll brush 64 and the distance between the upper second roll brush 62 and the lower second roll brush 66 are 0 mm up and down. is set up. Therefore, as shown in FIG. 3B, the evaluation glass plate 28 is positioned between the upper first roll brush 60 and the lower first roll brush 64, and between the upper second roll brush 62 and the lower second roll brush. When passing through the brush 66, the upper first roll brush 60, the upper second roll brush 62, the lower first roll brush 64, and the lower second roll brush 66 have a thickness of the evaluation glass plate 28. It is pressed against the evaluation glass plate 28 with a considerable pressure.

  On the surface of the evaluation glass plate 28 that has been subjected to the pressing step by the pressing device 12, foreign matter that can be removed by cleaning such as dust and paper debris from the glass interleaf paper 36 and foreign matter that is difficult to remove by cleaning adhere. The objects to be evaluated of the glass interleaf 36 and the evaluation glass plate 28 are foreign substances present on the surface of the evaluation glass plate 28 that are difficult to remove by washing. Therefore, in the cleaning process by the cleaning device 14, foreign substances that can be removed by cleaning are removed from the evaluation glass plate 28, and foreign substances that are difficult to remove by cleaning remain on the glass plate.

  1C, the cleaned evaluation glass plate 28 is transported to a defect inspection device 16 (offline defect inspection system FPI-6000 series (model number: FPI6090D) of Orbotech Co.). The inspected foreign material on the surface of the evaluation glass plate 28 is inspected by the light transmission method, and the defect inspection device 16 inspects the foreign material on the surface of the evaluation glass plate 28 which is difficult to remove by washing, and an image of all the foreign materials. To get.

  Next, as shown in FIG. 1D, an image 80 acquired by the defect inspection device 16 is displayed on the display device 18. Based on the image 80, the appearance of all foreign substances is visually observed. The number of white foreign substances having a size of 50 μm or less is counted from all the foreign substances. The lower limit of the size of the white foreign matter is not particularly limited, but is, for example, 0.1 μm or more.

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

  Using a defect inspection apparatus 16 or an off-line defect inspection system manufactured by Orbotech (FPI-6000 series (model number: FPI6090D)), all the foreign substances on the cleaned evaluation glass plate 28 are inspected, and an image of all the foreign substances is obtained. I do.

  The conditions for using the offline defect inspection system are shown below.

  The sensitivity is set to the high sensitivity mode (2 μm), and the non-measurement area is set to 10 mm from the end. Further, the lamp illuminance is set to “30” instead of “66” in the standard sensitivity mode (4 μm). That is, the lamp illuminance is reduced as compared with the standard sensitivity mode.

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

  In addition, the threshold value effective for a bright portion is set to “10” in the same manner as “10” in the standard sensitivity mode.

  The defect inspection device 16 automatically saves all defect images.

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

  Here, “visually observing the appearance” refers to the act of raising a foreign substance of 50 μm or less based on the major axis direction with reference to a scale bar attached to the image 80 obtained by the defect inspection device 16 and The act of listing a white foreign substance from among a plurality of types of foreign substances is included in any order.

  Next, the types of all foreign substances on the evaluation glass plate 28 acquired by the defect inspection device 16 will be described. FIG. 4 is an image of the foreign matter acquired by the defect inspection device 16 after the glass interleaf 36 is pressed against the evaluation glass plate 28 by 100 times and washed by the cleaning device 14. The present inventors have examined foreign matter based on an image acquired by the defect inspection device 16 and found that there are several types of foreign matter.

  FIG. 4A shows a black foreign substance (black / small) having a size of 50 μm or less. 4 (B) shows a black foreign substance ((black / large) having a size of more than 50 μm, and FIG. 4 (C) shows a white foreign substance (white / small) having a size of 50 μm or less. Fig. 4 (D) shows a white foreign substance (white / large) having a size larger than 50 µm, and Fig. 4 (E) shows an aggregate (dense) of a plurality of foreign substances. (F) shows foreign matter (others) not included in the foreign matter of FIGS. 4 (A) to (E).

  Here, the white foreign matter (white foreign matter) is, as shown in FIG. 4, in an image photographed under the above defect inspection conditions, the color contrast is confirmed between the outer peripheral portion (outline portion) of the foreign material and the inside of the foreign material. Refers to a foreign object that has a possible location.

  When a plurality of aggregates of foreign substances are present in one image, the aggregate is regarded as one foreign substance, and the size is determined based on the major axis 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 major axis direction.

  Also, for example, when counting the total number of foreign substances for two different types of glass slip sheets, the total number of foreign substances is almost the same, but the number of white foreign substances having a size of 50 μm or less in one glass slip sheet is reduced. In some cases, the number is smaller than the number of white foreign substances having a size of 50 μm or less in the other glass interleaving paper.

In addition, for another two different types of glass slip sheets, even if the total number of foreign matters on one glass slip sheet is smaller than the total number of foreign matters on the other glass slip sheet, the number of white foreign matters having a size of 50 μm or less is In some cases, the number of one glass interleaving paper is larger than the number of the other glass interleaving paper. The lower limit of the number of white foreign substances is not particularly limited, but is, for example, 1/269 m ² or more.

  That is, the number of white foreign substances having a size of 50 μm or less in the total number of foreign substances differs for each glass slip sheet. The inventors focused on the number of white foreign substances having a size of 50 μm or less, instead of the total number of foreign substances, and the glass interleaving paper with a small white foreign substance having a size of 50 μm or less resulted in the occurrence of defects such as disconnection of the glass plate. Can be suppressed. This result will be described in an example described later.

  When white foreign matter was analyzed, so-called artificial organic substances such as PET (polyethylene terephthalate), nylon, and EVA (ethylene / vinyl acetate copolymer resin) were mainly used. The artificial organic matter is, for example, when the paper raw material liquid passes through the plastic wire used in the wire part, or when the wet paper is mechanically squeezed and dewatered through several sets of rolls and felt in the press part, and the like. It is considered that the resin material is mixed when the resin material comes into contact with the paper raw material liquid or the wet paper.

  As a result of extensive studies by the inventors, it has been found that the influence of a contact member called a canvas is particularly large as a cause of the generation of white foreign matter.

(Method of manufacturing glass interleaving paper)
FIG. 5 is a schematic configuration diagram of a paper machine 100 that makes glass interleaving paper.

  As shown in FIG. 5, a raw material liquid for glass interleaving paper (a liquid obtained by diluting pulp with water) is supplied in a sheet shape from a head box 112 onto a lower wire 116 installed in a wire part 114. The paper raw material liquid supplied to the lower wire 116 is then sandwiched between the lower wire 116 and the upper wire 118 to be spread to a uniform thickness and dewatered to become wet paper (paper).

  The lower wire 116 and the upper wire 118 of the wire part 114 are permeable membranes formed in an endless strip shape. Specifically, it is a net made of a plastic or a metal material, or a felt endless band made of a natural fiber or a synthetic fiber.

  The lower wire 116 and the upper wire 118 are wrapped around a plurality of rollers and transmitted at a predetermined speed by transmitting a driving force of a motor (not shown) to a driving roller among the plurality of rollers. I have.

  The wet paper formed by the wire part 114 is transported to a press part 120 having a press roller, an endless belt-shaped felt, a pair of press rollers, and the like, where further dewatering and pressing are performed simultaneously.

  The wet paper web that has passed through the press part 120 is conveyed to a dryer part 124 composed of a plurality of rollers, and is dried in an atmosphere of, for example, about 120 ° C. while passing through the dryer part 124.

When the wet paper is transported as it is at a high speed as it passes through the dryer part 124, there is a risk that the wet paper will run out. Therefore, an auxiliary member called a canvas is transported in contact with the wet paper. In order to obtain a glass plate with few white foreign substances as in the present embodiment, the following is preferable. That is, so-called artificial organic substances such as PET (polyethylene terephthalate), nylon, and EVA (ethylene-vinyl acetate copolymer resin) are not used for the material constituting the canvas, or the canvas is replaced before the canvas is deteriorated by use. Alternatively, the surface of the canvas is coated with a material that cannot become a white foreign substance such as cellulose or SiO ₂ .

  The paper dried in the dryer part 124 is conveyed to the calender part 126 and subjected to a calendering process by nipping and conveying with a calender roll, so that the front and back surfaces are smoothed. If necessary, a coater part may be provided between the dryer part 124 and the calendar part 126, and a paint or the like may be applied to the surface of the smoothed paper.

  The paper that has been subjected to the calendar processing in the calendar part 126 is wound on a reel 128 as a glass interleaving paper, and formed into a roll (hereinafter, referred to as a jumbo roll 130).

  Usually, for example, the glass interleaf cut into a jumbo roll 130 is cut into a width corresponding to the product and wound up, and a long glass interleaf having a predetermined length of about 8000 to 10000 m is wound. The interleaf roll 42 is turned. That is, the glass interleaving paper is usually subdivided from the jumbo roll 130.

  The glass slip sheet is sent out from the jumbo roll 130, cut into a predetermined width by the cutter 134 (cut in the longitudinal direction), and wound up by the winder 136. When the glass interleaf sent from the jumbo roll 130 reaches a predetermined length, the glass interleaf is cut into a predetermined length (cut in the width direction) by the cutter 134, and a long glass interleaf with a predetermined width is cut. The interleaf roll 42 is wound.

  The long glass interleaf wound around the interleaf roll 42 is cut into a cut sheet shape (rectangular shape) having a size corresponding to the glass plate to be laminated, and is interposed between the laminated glass plates.

  When preparing a paper raw material liquid to be supplied to the head box 112 in the glass papermaking machine 100 (papermaking process), it is preferable to use pulp with less white foreign matter as a pulp sheet as a raw material.

  For example, the number of white foreign substances on the pulp sheet is counted by a method similar to the measurement method performed on the glass interleaving paper described above. By selecting pulp sheets based on the number of white foreign substances, a pulp sheet with few white foreign substances can be used.

  In the manufacturing process of the pulp sheet, artificial organic matter may adhere 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 interleaving paper. In addition, it is preferable that the content of the artificial organic matter in the pulp sheet is 0.08% by mass or less. When the content of the artificial organic matter is 0.08% by mass or less, the amount of the artificial organic matter mixed into the glass interleaving paper can be reduced. The term “artificial organic matter” as used herein refers to a resin content in a pulp sheet measured according to JIS P8222: 2002.

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

When counting the number of white foreign substances on a pulp sheet, the number of white foreign substances having a size of 50 μm or less is preferably 200 / m ² or less.

  In order to reduce the contamination of organic matter in the paper making process, it is preferable to remove resin burrs of the resin member used in the paper making process and coming into contact with the paper raw material liquid, the wet paper and the like. Since resin burrs are easily removed and easily mixed into a paper raw material liquid, wet paper, or the like, it is effective to remove resin burrs.

  Further, before papermaking, it is preferable to perform weak alkali washing or weak acidic washing in all piping and steps. This is because, when newly producing glass interleaving paper, it is possible to suppress the entry of organic substances generated when another interleaving paper is made.

  As described above, it is difficult to produce a glass interleaving paper with less white foreign matter unless it is thoroughly managed, which has not been conventionally performed.

(Glass plate package)
The glass plate package of the present embodiment has a glass plate laminate in which glass slip sheets and glass plates are alternately laminated, and a pallet on which the glass plate laminate is placed.

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

  The glass plate package 250 shown in FIG. 6 includes a glass plate laminate 262 in which glass slip sheets 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 includes a base 254, an inclined table 256 erected on the upper surface of the base 254, and a mounting table 258 mounted on the upper surface of the base 254. Have.

  One surface of the inclined table 256 in the horizontal direction (the 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 any angle at which the stacked glass plates G can be stably stacked, stored and transported, and is usually 85 ° or less with respect to the horizontal direction, for example, 85 ° to 70 °. preferable.

  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, the upper surface of the mounting table 258 is configured to be 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 stacked on the inclined surface of the inclined table 256.

  Further, between the glass plates G, the glass interleaving paper 260 of the present embodiment is interposed. The glass interleaving paper 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. Note that the size of the glass plate G is preferably 2200 mm × 1800 mm or more. As described above, when the size of the glass plate is large, the occurrence rate of defects such as disconnection of the wiring increases, so that the glass interleaving paper of the present embodiment can be suitably applied. Further, the size of the glass plate G is preferably 2400 mm × 2100 mm. The size of the glass interleaving paper is preferably the same as or larger than the size of the glass plate, and particularly preferably 20 mm or more in both the vertical and horizontal directions.

  A glass slip sheet 260 may be similarly interposed between the laminated glass sheet G and the inclined table 256, and the surface of the frontmost glass sheet G is similarly covered with the glass slip sheet 260. You may.

  As described above, the glass plate package 250 is formed. In this case, if necessary, an abutment plate may be brought into contact with the frontmost glass plate G (glass interleaf paper), and the belt-shaped body may be stretched over and fixed to the inclined base 256. A cover may be hung so as to cover the plate G.

  The glass plate package of the present invention is not limited to the glass plate package 250 shown in FIG. 6 in which the glass plates G are leaned and stacked (so-called vertical stacking). The glass plate package uses a pallet on which glass plates G can be horizontally stacked (so-called flat stacking), for example, like a plate-shaped body storage container disclosed in Japanese Utility Model Registration No. 3165973. You may.

In the case of flat stacking, the load acting on the glass plate and the glass interleaf near the bottom is increased, so that foreign substances are easily transferred from the glass interleaf to the glass plate, and a large number of sheets cannot be stacked. By using the slip sheet, a large number of sheets can be stacked. Specifically, even when the glass slip sheet is pressed against the glass plate with a surface pressure of 30 g / cm ² or more at a load per unit area, foreign matters transferred from the glass slip sheet can be suppressed.

  In the glass plate package of the present embodiment, various types of known glass plates are exemplified as the glass plate G. Among them, a glass plate on which elements such as wirings and electrodes are formed on the surface is preferable, and a glass plate for FPD is particularly preferable.

  As described above, the glass interleaving paper, the glass plate laminate, and the glass plate package have been described in detail, but the present invention is not limited to the above-described example, and various improvements and modifications can be made without departing from the gist of the present invention. Of course, changes may be made.

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

[Example 1]
A glass interleaf was produced using a general glass interleaf paper machine shown in FIG. 5 and using virgin pulp (pulp sheet) as a raw material. As a raw material, JIS P8224: 200
A pulp sheet having an organic matter content of 0.08% by mass or less and a white foreign matter visually observed of 0.14 / m ² or less was used.

The glass paper produced from this pulp sheet was placed on a glass plate for evaluation (A) having a thickness of 0.7 mm and a size of 370 mm × 470 mm, and the glass paper was inserted (number of times: 100 times, time: 4 seconds / Times, pressure: 0.45 MPa, glass plate temperature for evaluation: 55 ° C.), and (B) pure water is supplied while conveying the pressed glass plate (line speed: 200 cm / min) (flow rate: 57 L / min) and a total of four roll brushes (roll diameter: φ60, bristle diameter: 0.06 mm / close winding, material: nylon), two on the upper side of the evaluation glass plate and two on the lower side 612, rotation speed: 300 rpm, distance: upper and lower sides 0 mm), the glass plate for evaluation is washed, and (C) an off-line defect inspection system (FPI-6000 series (model number: FPI6090D) manufactured by Orbotech) is used. Inspection of all the foreign substances on the washed evaluation glass plate, obtaining an image of all the foreign substances, (D) visually observing the external appearance of all the foreign substances based on the image, and measuring a size of 50 μm or less from among all the foreign substances. When the number of white foreign matters was counted, the total number of foreign matters in the glass slip sheet was 32 pieces / 269 m ² , and the number of white foreign matters having a size of 50 μm or less was 10 pieces / 269 m ² .

[Example 2]
As a raw material, a pulp sheet having an organic substance content of 0.05% by mass or less as measured according to JIS P8224: 2002 and white foreign matter of 0.1 / m ² or less visually observed was used. Except for the above, a glass interleaf was produced in the same manner as in Example 1.

When the number of white foreign substances having a size of 50 μm or less was counted from all the foreign substances, the total number of foreign substances was 25/269 m ² , and the glass interleaving paper made of this pulp sheet had a total number of white foreign substances of 50 μm or less. The number of foreign substances was 6/269 m ² .

[Example 3]
As a raw material, a pulp sheet having an organic substance content of 0.01% by mass or less as measured in accordance with JIS P8222: 2002 and a white foreign matter of 0.05 / m ² or less visually observed was used. Except for the above, a glass interleaf was produced in the same manner as in Example 1.

When the number of white foreign substances having a size of 50 μm or less was counted from all the foreign substances, the total number of foreign substances was 24/269 m ² , and the glass interleaf paper made of this pulp sheet showed a white foreign substance having a size of 50 μm or less. The number of foreign matters was 3/269 m ² .

[Comparative Example 1]
As a raw material, JIS P8224: at a content of organic matter which is measured in accordance with 2002 0.1 mass% or less, and white foreign substances was visually observed using a pulp sheet is 0.3 pieces / ^{m 2} or less, A glass interleaf was produced in the same manner as in Example 1, except that the paper was made in a line where the resin member was not washed.

When the number of white foreign substances having a size of 50 μm or less was counted from all the foreign substances, the total number of foreign substances was 40/269 m ² , and the white paper having a size of 50 μm or less was obtained. The number of foreign matters was 15 pieces / 269 m ² .

[Performance evaluation]
The glass slip sheets prepared in Examples 1 to 3 and Comparative Example 1 were interposed between glass plates for FPD having a thickness of 0.5 mm and a size of 2500 × 2200 mm to form a plurality of glass plates. The laminated glass plate was obtained.

  This glass plate laminate was placed on the pallets shown in FIG. 6 vertically stacked on each of the glass inserts of Examples 1 to 3 and Comparative Example 1 (2000 glass plates) to produce a glass plate package. did. The glass plate package was stored for 10 days.

  After taking out the glass plate from the glass package and washing the glass plate, a straight wire having a width of 10 μm was formed on the surface of the glass plate by an existing method, and the disconnection state of the wire was confirmed.

  When 2000 glass plates were used and 20 or less disconnection failures occurred, it was evaluated as ○, and when more than 20 disconnection failures occurred, it was evaluated as x.

Table 1 shows the measurement results and the evaluation results. According to Table 1, when the number of white foreign substances having a size of 50 μm or less was 10 pieces / 269 m ² or less, all the evaluation results were ○. When the number of white foreign substances having a size of 50 μm or less was more than 10 pieces / 269 m ² , all evaluation results were ×.

  From this result, it can be understood that the number of white foreign substances having a size of 50 μm or less is related to defects such as disconnection occurring on the glass plate.

It can be assumed that foreign substances larger than 50 μm are removed when cleaning the glass plate, while white foreign substances having a size of 50 μm or less are hardly removed by cleaning. Therefore, by setting the number of white foreign substances having a size of 50 μm or less to 10 pieces / 269 m ² or less, it is possible to suppress defects such as disconnection occurring in the glass plate.

This application is based on Japanese Patent Application No. 2015-190848 filed on September 29, 2015, the contents of which are incorporated herein by reference.

  Reference Signs List 10 measuring device, 12 pressing device, 14 cleaning device, 16 defect inspection device, 18 display device, 20 lower platen, 22 upper platen, 24 cylinder device, 26 suction pad, 28 evaluation Glass plate, 30: suction pad, 32: dummy glass plate, 34: interleaf paper supply device, 36: glass interleaf, 38: cylinder body, 40: piston, 42: interleaf roll, 44: winding shaft, Reference numeral 46: rotation support portion, 48: winding portion, 50: tension roller, 52: tension roller, 54: winding shaft, 56: motor, 58: nozzle, 60: upper first roll brush, 62: upper second roll Brush: 64: Lower first roll brush, 66: Lower second roll brush, 250: Glass plate package, 252: Pallet, 254: Base, 256: Inclined table, 258: Mounting table, 260: Glass plate Paper, 26 ... glass plate laminate

Claims (9)

Glass interleaving paper, wherein the number of white foreign matters having a size of 50 μm or less counted by the following measurement method is 10/269 m ² or less.
[Measuring method]
(A) Glass interleaf paper (number of times: 100 times, time: 4 seconds / time, pressure: 0.45 MPa, glass plate for evaluation) on a glass plate for evaluation (a size of 370 mm × 470 mm with a thickness of 0.7 mm) Temperature: 55 ° C)
(B) While conveying the pressed glass sheet for evaluation (line speed 200 cm / min), pure water is supplied (flow rate: 57 L / min), and two pieces are provided above and below the glass sheet for evaluation. A total of four roll brushes (roll diameter (inner diameter): φ60, roll diameter (outer diameter): φ80, bristle diameter: 0.06 mm / close wound, material: nylon 612, rotation speed: 300 rpm , Distance: 0 mm above and below) to wash the glass plate for evaluation.
(C) Using an off-line defect inspection system (FPI-6000 series (model number: FPI6090D)) manufactured by Orbotech, all foreign substances on the cleaned evaluation glass plate are inspected, and images of all foreign substances are obtained.
(D) The external appearance of all the foreign substances is visually observed based on the image, and the number of white foreign substances having a size of 50 μm or less is counted from among all the foreign substances. 2. The glass interleaving paper according to claim 1, wherein the number of white foreign matters having a size of 50 μm or less counted by the measurement method is 6/269 m ² or less. 3. 3. The glass paper according to claim 2, wherein the number of white foreign substances having a size of 50 μm or less counted by the measurement method is 3/269 m ² or less. 4. 4. A glass insert used for a glass plate having a size of 2200 mm × 1800 mm or more, wherein the size of the glass insert is the same as or larger than the size of the glass plate. 5. Glass paper. 4. The glass interleaving paper used for a glass plate that is 2200 mm × 1800 mm or more, wherein the size of the glass interleaving paper is 20 mm or more both vertically and horizontally than the size of the glass plate. 5. Glass insert paper. The glass interleaving paper according to any one of claims 1 to 5 , wherein the content of the organic substance measured according to JIS P8224: 2002 is 0.08% by mass or less. A glass sheet laminate in which the glass slip sheets and glass sheets according to any one of claims 1 to 6 are alternately laminated. 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.