JP2017065803A - Glass paper, glass plate laminated product, and glass plate package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide glass paper, glass plate laminated product, and glass plate package capable of suppressing occurrence of contamination and failure of wiring due to foreign substance transcribed from glass paper.SOLUTION: There is provided glass paper in which the number of white foreign substance having 50 μm or less of size counted by the following measurement method is 10/269 mor less. [measurement method] Glass paper is pressed onto evaluation glass plate, (B) while transporting the evaluation glass plate subjected to the press, supplying pure water, washing the evaluation glass plate with total 4 roll brushes, 2 of them are arranged above and 2 of them are arranged below the evaluation glass plate, with Orbotech, off-line defect examination system (FPI-6000 series (type: FPI6090D)), examining all of foreign substances on the evaluation glass plate to obtain image of all of the foreign substances, observing all of the foreign substances with eyes based on the image, and counting the number of foreign substance having 50 μm or less in size among the all of the foreign substances.SELECTED DRAWING: Figure 1

Description

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

  FPD (Flat Panel Display) glass plates such as architectural glass plates, automotive glass plates, plasma display glass plates, and liquid crystal display glass plates have wrinkles on the surface during storage and transportation. Product defects may occur due to contamination with contaminants in the atmosphere.

  In particular, FPD glass plates (glass substrates) have fine electrical wiring (hereinafter also referred to as wiring), electrodes, electrical circuits, partition walls, and other elements formed on the surface, so that there are slight wrinkles and contamination on the surface. Even if it exists, it causes a defect such as disconnection. Therefore, high surface cleanliness is required for glass plates used in these applications.

  Generally, a glass plate is stored and transported in a state of being laminated on a pallet for packing.

  At this time, by interposing a so-called glass interleaving paper between the glass plates, the surfaces of the adjacent glass plates are separated from each other, thereby preventing the surface of the glass plates from being contaminated by contaminants in the atmosphere.

  However, in the method of interposing glass interleaving paper between the glass plates, the glass interleaving paper and the surface of the glass plate are in direct contact. Therefore, various components (foreign matter) such as resin existing on the surface of the glass slip sheet are transferred to the surface of the glass plate. When glass interleaving paper having a large amount of foreign matter on the surface is used, problems such as paper texture, burns and dirt are likely to occur on the glass plate. Moreover, 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 matters from the surface of the glass plate even after cleaning.

  As a method for solving the above problem, for example, Patent Document 1 discloses a glass plate package in which a glass plate is packed using a glass interleaving paper having a higher saturated fatty acid content of 0.08% by mass or less. ing.

  Patent Document 2 discloses glass interleaving paper in which the content of an organic compound having a silicon element is 3 ppm or less.

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

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

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

  The present invention has been made in view of such circumstances, and a glass interleaving paper that can sufficiently suppress the occurrence of contamination due to foreign matters transferred from the glass interleaving paper and defects such as wiring, and the glass interleaving. It is providing the glass plate laminated body which uses paper, and a glass plate package.

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

[Measuring method]
(A) Glass sheet for evaluation (number of times: 100 times, time: 4 seconds / time, pressure: 0.45 MPa, glass plate for evaluation) on a glass plate for evaluation (thickness 0.7 mm, size 370 mm × 470 mm) (Temperature: 55 ° C.) and (B) The evaluation glass plate is fed (flow rate: 57 L / min) while conveying the evaluation glass plate after the pressing (line speed 200 cm / min), and the evaluation glass plate. 4 roll brushes (roll diameter (inner diameter): φ60, roll diameter (outer diameter): φ80, hair diameter: 0.06 mm / close winding, material) : Nylon 612, rotation speed: 300 rpm, distance: 0 mm above and below), the evaluation glass plate was washed, and (C) an offline defect inspection system (FPI-6000 series (model number: FPI6090D)) manufactured by Orbotech, All the foreign matters on the cleaned glass plate for evaluation are inspected to obtain an image of all the foreign matters. (D) The appearance of all the foreign matters is visually observed based on the image. Count the number of white foreign bodies of the size of.

Preferably, it is glass interleaving paper, and 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.

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

Preferably, it is glass interleaving paper, Comprising: Content of the organic substance measured based on JISP8224: 2002 is 0.08 mass% or less.

  The glass plate laminated body by another one aspect | mode of this invention is a glass plate laminated body which laminated | stacked the said glass interleaving paper and the glass plate alternately.

  The glass plate package by another one aspect | mode of this invention is equipped with the said glass plate laminated body and the pallet which mounts the said glass plate laminated body.

  Preferably, the pallet is a pallet on which the glass plate 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 transcribe | transferred from a glass slip sheet, and defects, such as wiring, can be suppressed.

1A to 1D are overall configuration diagrams of the measuring apparatus. FIGS. 2A to 2D are explanatory views showing the slip sheet supply operation and the press operation by the press device and the slip sheet supply device over time. 3 (A) and 3 (B) are explanatory views showing a state when the glass plate for evaluation passes through the cleaning device. 4A to 4F are images acquired by the defect inspection apparatus. 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 illustrated by the following preferred embodiments. Changes can be made by many techniques without departing from the scope of the present invention, and other embodiments than the present embodiment can be utilized. Accordingly, all modifications within the scope of the present invention are included in the claims.

  Here, in the drawing, portions indicated by the same symbols are similar elements having similar functions. In addition, in the present specification, when a numerical range is expressed 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, in order to prevent defects such as contamination of the surface of the glass plate and disconnection of the wiring formed on the surface of the glass plate by transferring foreign substances from the glass paper to the glass plate, Reducing the content of foreign substances in the inside has been performed.

  However, according to the study by the present inventors, glass plates with elements such as wiring and electrodes formed on the surface thereof, such as glass plates for FPD, have been hitherto due to the recent increase in size and definition of displays. Even in the case of glass interleaving paper with a small number of foreign objects that had not been problematic, defects such as wiring occurred at a probability that was not low. As a result of further studies, the inventors have found that by reducing the number of specific foreign matters having a size of 50 μm or less, defects such as wire breakage can be suppressed, and the present invention has been achieved.

(Glass interleaving paper)
As the glass interleaving paper used in the present embodiment, chemical pulp such as kraft pulp (KP), sulfite pulp (SP), soda pulp (AP); semi-chemical pulp (SCP), chemi-grandwood pulp (CGP) Semi-chemical pulp such as ground pulp (GP), thermomechanical pulp (TMP, BCTMP), refiner grandwood pulp (RGP) and other mechanical pulp; Synthetic pulp; etc. Glass interleaving paper made of various raw materials can be used. Furthermore, the glass interleaving paper of the present invention may be a mixture of these materials, or may be a material containing cellulose or the like.

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

  In the glass interleaving paper of this embodiment, any pulp is a silicone-based antifoaming agent (a defoaming material containing silicone) that causes a major cause of defective wiring or electrodes when transferred to a glass plate. It is preferable to use the pulp manufactured without using the agent as a raw material.

  Especially, the pulp manufactured without using the antifoamer containing polydimethylsiloxane is used especially suitably as a raw material of the glass interleaving paper of this embodiment.

Moreover, it is preferable that content of the organic substance measured based on JISP8224: 2002 is 0.08 mass% or less for glass interleaving paper. Although the lower limit of content of organic substance is not specifically limited, For example, it is 0.001 mass% or more. By making content of organic substance 0.08 mass% or less, it can suppress that organic substance is transferred from a glass interleaving paper to a glass plate.

(Measuring method)
Next, the measuring method of the foreign material of glass interleaving paper is demonstrated. FIG. 1 shows an overall configuration diagram of a measuring apparatus 10 according to an embodiment.

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

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

  Examples of the glass plate for evaluation 28 include FPD glass plates such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic electroluminescence (EL) display. A flat glass plate including a glass plate, a vehicle glass plate and the like can also be exemplified.

  The upper surface plate 22 is disposed so as to face the lower surface plate 20 in the vertical direction. The upper surface plate 22 is fixed to a frame (not shown). A plate-like suction pad 30 is affixed to the lower surface of the upper surface plate 22, and a dummy glass plate 32 is detachably held by suction on the horizontal lower surface of the suction pad 30.

  A belt-shaped glass interleaf paper 36 rewound from an interleaf paper supply device (see FIG. 2) described later is placed in the gap between the evaluation glass plate 28 and the dummy glass plate 32 in the evaluation glass plate 28 and the dummy. The glass plate 32 is inserted in parallel with each surface.

  The cylinder device 24 is a fluid cylinder that raises and lowers the lower surface plate 20. The cylinder body 38 is fixed to a gantry (not shown), and the upper end portion of the piston 40 that extends and contracts with respect to the cylinder body 38 is fixed to the lower surface of the lower surface plate 20. Has been.

  Therefore, when the piston 40 is extended, the lower platen 20 is raised, so that the evaluation glass plate 28 comes into contact with the glass interleaving paper 36 positioned above the lower platen 20. Due to the continued upward movement of the lower surface plate 20, the glass interleaving paper 36 is lifted upward (in the direction approaching the dummy glass plate 32), and then sandwiched between the evaluation glass plate 28 and the dummy glass plate 32. Thereby, the glass plate 28 for evaluation and the glass interleaving paper 36 are pressed. Further, during pressing, the glass interleaving paper 36 is supported on the upper surface plate 22 via the glass plate 32. Furthermore, the form of the glass plate laminated body (FIG. 6) laminated | stacked through the interleaving paper on the packing body (FIG. 6) by pinching the glass interleaving paper 36 with the glass plate 28 for evaluation and the dummy glass plate 32. FIG. Is reproduced. Further, by pressing the evaluation glass plate 28 against the glass interleaving paper 36 with a predetermined pressing force, a load close to the actual transportation can be reproduced. Further, when the piston 40 is contracted, the lower surface plate 20 descends in a direction in which the pressure is removed.

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

  FIG. 2 is an explanatory view showing the pressing operation and the interleaf feeding operation by the pressing device 12 and the interleaf feeding device 34 continuously.

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

  The interleaf supply device 34 includes a rotation support unit 46 that rotatably supports an interleaf roll 42 wound in a roll shape around a winding shaft 44, and a belt-like glass interleaf 36 from the interleaf roll 42. And a winding unit 48 for winding up.

  As shown in FIG. 2A, the tip of the glass slip sheet 36 is fixed to the take-up shaft 54. At this time, the lower surface plate 20 is located at the pressure removal position retracted downward from the pressure position.

  In the initial setting before the evaluation is started, the glass interleaving paper 36 is rewound from the interleaf paper roll 42 in the direction of arrow A, wound around the tension roller 50, and in the gap between the lower surface plate 20 and the upper surface plate 22. It is inserted. Then, the glass interleaving paper 36 is wound around the tension roller 52, and the tip end portion of the glass interleaving paper 36 is fixed to the take-up shaft 54 of the take-up portion 48. The take-up shaft 54 is rotated in the same direction as the direction in which the glass interleaving paper 36 is rewound from the interleaf paper roll 42 (arrow A direction) when the power of the motor 56 is transmitted. In this way, the glass interleaving paper 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 surface plate 20 is raised in the direction of the arrow B that presses the glass plate for evaluation 28 and the glass interleaving paper 36. The surface of the evaluation glass plate 28 is pressed against the interleaf paper 36. The conditions at this time are 4 seconds / time, a pressure of 0.45 MPa, and the temperature of the glass plate for evaluation 28 is 55 ° C.

  Next, as shown in FIG. 2 (C), the piston 40 of the cylinder device 24 is contracted, and the lower surface plate 20 is positioned at the pressing removal position retracted downward from the pressing position. Thereafter, the interleaving paper supply device 34 rewinds the glass interleaving paper 36 by one sheet from the interleaving paper roll 42.

  Although not shown in FIG. 2, a control device that intermittently drives and controls the cylinder device 24 and the motor 56 is provided. The control device alternately performs an intermittent pressing / pressing release operation by the cylinder device 24 indicated by arrows B and C and an intermittent slip-sheet winding operation for one sheet by the motor 56 indicated by the arrow A alternately a plurality of times. To control. That is, the control device sets the cylinder device 24 and the motor 56 so that the slip sheet supplying step by the slip sheet supplying device 34 and the pressing step by the cylinder device 24 are alternately performed a plurality of times on the evaluation glass plate 28. The drive is controlled intermittently.

  The interleaf winding operation for one sheet of the glass interleaving paper 36 means that the size of the glass interleaving paper 36 used for packaging and transporting the evaluation glass plate 28 is one sheet, and that one sheet is wound. The action to take. Thus, the evaluation glass plate 28 is always pressed against the new glass slip sheet 36. By repeating the interleaf winding operation for the interleaf roll 42 a plurality of times, the foreign matter information of the large area interleaf paper roll 42 can be collected on one evaluation glass plate 28.

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

  Although the interleaf paper winding operation for the entire length of the interleaf paper roll 42 can be repeated, the time for collecting the foreign substance information on one evaluation glass plate 28 becomes longer. In consideration of the foreign matter information and time collected on the evaluation glass plate 28, in this embodiment, the interleaf winding operation is performed 100 times, that is, the foreign matter information for 100 sheets of the glass interleaving paper 36 is stored in the evaluation glass plate 28. It is aggregated.

  Moreover, when using the glass slip paper 36 cut | disconnected by the same size as the glass plate 28 for evaluation with the press apparatus 12 of embodiment, the glass slip paper is provided in the lower surface of the dummy glass plate 32 of the upper surface plate 22. FIG. 36 may be pasted. Thereby, the glass interleaving paper 36 is supported by the upper surface plate 22 via the dummy glass plate 32.

  The cleaning device 14 shown in FIG. 1 (B) cleans the surface of the evaluation glass plate 28 on which the glass interleaving paper 36 has been pressed by the pressing device 12, and adheres to the surface of the evaluation glass plate 28 from the glass interleaving paper 36 ( Remove the transferred foreign matter.

  In the cleaning device 14, while the evaluation glass plate 28 is conveyed 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 are supplied. The evaluation glass plate 28 is cleaned with the lower first roll brush 64 and the lower second roll brush 66 at a rotation speed of 300 rpm (the same direction as the conveying direction of the evaluation glass plate 28). The foreign matter that is difficult to remove by washing cannot be removed and remains 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 on the upper side of the evaluation glass plate 28, the lower first roll brush 64 disposed on the lower side of the evaluation glass plate 28, and A lower second roll brush 66 is provided. A nozzle 58 for injecting pure water is provided on the surface of the evaluation glass plate 28.

  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 28.

  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 closely wound roll brush having a roll diameter (inner diameter) of 60φ, a roll diameter (outer diameter) of 80φ, and a hair diameter of 0.06 mm. The roll brush bristles are made of nylon 612. Close winding means winding a channeled brush on a roll without gaps.

  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 in positions where the bristles contact each other, that is, It is arranged at a position of 0 mm above and below. Similarly, the upper second roll brush 62 and the lower second roll brush 66 are arranged at positions where the bristles contact each other, that is, at a position of 0 mm in the vertical direction.

  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. By rotating the brush 62, the lower first roll brush 64, and the lower second roll brush 66 in the same direction as the conveying direction of the evaluation glass plate 28, the surface of the evaluation glass plate 28 is cleaned.

  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 in the vertical direction. is set up. Therefore, as shown in FIG. 3B, the evaluation glass plate 28 is provided 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. When passing between the brushes 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 are the thickness of the glass plate 28 for evaluation. It is pressed against the glass plate for evaluation 28 with a considerable pressure.

  On the surface of the glass plate for evaluation 28 that has undergone the pressing step by the pressing device 12, foreign matters that can be removed by washing such as dust and paper scraps from the glass interleaving paper 36 and foreign matters that are difficult to remove by washing are attached. The evaluation object of the glass interleaving paper 36 and the glass plate for evaluation 28 is a foreign matter that is difficult to remove by cleaning present on the surface of the glass plate for evaluation 28. 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 are left on the glass plate.

  1C, the cleaned evaluation glass plate 28 is transported to the defect inspection apparatus 16 (off-line defect inspection system FPI-6000 series (model number: FPI6090D) manufactured by Orbotech). The inspection object is inspected for foreign matter on the surface of the evaluation glass plate 28. The defect inspection device 16 inspects the foreign matter present on the surface of the evaluation glass plate 28 that is difficult to remove by the light transmission method, and images of all the foreign matters. To get.

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

  Next, a measurement method for counting the number of white foreign matters will be described.

  Using the offline inspection system (FPI-6000 series (model number: FPI6090D)) manufactured by Orbotech, which is the defect inspection apparatus 16, all foreign matters on the cleaned glass plate for evaluation 28 are inspected to obtain images of all foreign matters. To 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 lowered compared to the standard sensitivity mode.

  On the other hand, regarding the setting (threshold value) on the light receiving element side, the effective threshold value for dark portions 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.

  Further, the threshold effective for the bright portion is set to “10” similarly to “10” in the standard sensitivity mode.

  All defect images are automatically stored in the defect inspection apparatus 16.

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

  Here, “visual appearance observation” refers to the act of enumerating foreign matter of 50 μm or less with reference to the major axis direction with reference to the scale bar given to the image 80 obtained by the defect inspection apparatus 16. The act of picking up a white foreign substance from a plurality of types of foreign substances is included in any order.

  Next, the types of all foreign matters on the evaluation glass plate 28 acquired by the defect inspection apparatus 16 will be described. FIG. 4 is an image of the foreign matter acquired by the defect inspection device 16 after the glass interleaving paper 36 is pressed 100 times against the evaluation glass plate 28 and cleaned by the cleaning device 14. The inventors have examined foreign matter based on the image acquired by the defect inspection apparatus 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. 4B shows black foreign matters ((black / large) having a size larger than 50 μm. FIG. 4C shows white foreign matters (white / small) having a size of 50 μm or less. 4D shows a white foreign substance (white / large) having a size larger than 50 μm, and FIG.4E shows an aggregate (dense) of a plurality of foreign substances. (F) shows foreign matters (others) that are not included in the foreign matters shown in FIGS.

  Here, as shown in FIG. 4, the white foreign matter (white foreign matter) is a color contrast confirmed between the outer peripheral portion (outline portion) of the foreign matter and the inside of the foreign matter in the image taken under the defect inspection conditions. It refers to a foreign object that has a place where it can be made.

  When a plurality of foreign matter aggregates exist in one image, the aggregate is regarded as one foreign matter, and the size is determined with reference to the major axis direction.

  The size of the foreign matter is classified into a foreign matter having a size of 50 μm or less and a foreign matter having a size larger than 50 μm, based on the major axis direction.

  Further, for example, when the number of all foreign matters is counted for two different types of glass slip sheets, the total number of foreign matters is almost the same, but the number of white foreign matters having a size of 50 μm or less of one glass slip sheet is the same. The number of white foreign matters having a size of 50 μm or less of the other glass interleaving paper may be smaller.

In addition, regarding two different types of glass interleaving paper, the total number of foreign matters on one glass interleaving paper is less than the total number of foreign matters on the other glass interleaving paper, but regarding the number of white foreign matters having a size of 50 μm or less The number of one glass interleaving paper may be larger than the number of the other glass interleaving paper. Note that the lower limit of the number of white foreign matters is not particularly limited, but is, for example, 1/269 m ² or more.

  That is, the number of white foreign matters having a size of 50 μm or less in the total number of foreign matters differs for each glass interleaving paper. The inventors pay attention not to the total number of foreign matters but to the number of white foreign matters having a size of 50 μm or less, and the glass interleaving paper having a size of 50 μm or less with few white foreign matters results in the occurrence of defects such as disconnection of the glass plate. It was found that can be suppressed. This result will be described in an example described later.

  As a result of analysis of white foreign substances, so-called artificial organic substances such as PET (polyethylene terephthalate), nylon, EVA (ethylene / vinyl acetate copolymer resin) were mainly used. 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 dehydrated through several sets of rolls and felt in the press part, etc. It is considered that the resin member is mixed when the paper raw material liquid or wet paper comes into contact.

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

(Glass interleaving method)
FIG. 5 is a schematic configuration diagram of a paper machine 100 for making glass interleaving paper.

  As shown in FIG. 5, the raw material liquid for glass interleaving paper (liquid obtained by diluting pulp with water) is supplied in a sheet form from the head box 112 onto the lower wire 116 installed in the 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, thereby being spread to a uniform thickness and dehydrated 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 belt shape. Specifically, it is a net made of plastic or metal material, or an endless belt made of felt made of natural fiber or synthetic fiber.

  The lower wire 116 and the upper wire 118 are wound around a plurality of rollers, and are rotated at a predetermined speed by transmitting the driving force of a motor (not shown) to the driving rollers in the plurality of rollers. Yes.

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

  The wet paper 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 passing through the dryer part 124, if the wet paper is transported at high speed as it is, there is a risk of running out of paper. Therefore, an auxiliary member called a canvas is transported in contact with the wet paper. In order to obtain a glass plate with less white foreign matter as in this embodiment, the following is preferable. That is, do not use so-called artificial organic substances such as PET (polyethylene terephthalate), nylon, EVA (ethylene-vinyl acetate copolymer resin), or replace the canvas before it deteriorates due to use, Or, the surface of the canvas may be coated with a white foreign substance such as cellulose or SiO ₂ .

  The paper dried by the dryer part 124 is conveyed to the calendar part 126 and subjected to a calendar process by nipping and conveying with a calendar roll, etc., and 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 smoothed paper surface.

  The paper that has been subjected to the calendar process in the calendar part 126 is wound around a reel 128 as a glass interleaving paper and is rolled (hereinafter referred to as a jumbo roll 130).

  The glass interleaf made into the jumbo roll 130 is usually cut into a width corresponding to the product and wound up, for example, and a long glass interleaf having a predetermined length of about 8000 to 10,000 m is wound. The rotated interleaf paper roll 42 is used. In other words, the glass slip sheet is usually subdivided from the jumbo roll 130.

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

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

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

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

  Even in the manufacturing process of a pulp sheet, an artificial organic substance may adhere to the pulp sheet when contacting the resin member. Furthermore, 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 content of the artificial organic substance in a pulp sheet is 0.08 mass% or less. When the content of the artificial organic substance is 0.08% by mass or less, the artificial organic substance mixed in the glass interleaving paper can be reduced. The term “artificial organic material” as used herein refers to the resin content in the pulp sheet measured according to JIS P8224: 2002.

  The use of a 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 matters on the pulp sheet, the number of white foreign matters having a size of 50 μm or less is preferably 200 pieces / m ² or less.

  In order to reduce the mixing of organic substances in the papermaking process, it is preferable to remove the resin burrs of the resin member used in the papermaking process and in contact with the paper raw material liquid or wet paper. It is effective to remove the resin burrs because the resin burrs are easily removed and easily mixed into the paper raw material liquid and wet paper.

  Moreover, before making paper, it is preferable to perform weak alkali cleaning or weak acid cleaning in all the piping and processes. This is to prevent the organic matter generated when other interleaf paper is made from being mixed when newly producing glass interleaving paper.

  As described above, it is difficult to produce a glass interleaving paper with little white foreign matter unless it is thoroughly controlled which has not been carried out conventionally.

(Glass plate package)
The glass plate package of this embodiment has a glass plate laminate in which glass interleaving paper 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. In addition, FIG. 6 is the figure (side view) which looked at the glass plate package from the side surface direction of glass.

  A glass plate package 250 shown in FIG. 6 includes a glass plate laminate 262 in which glass interleaving paper 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. The pallet 252 includes a base 254, an inclined base 256 erected on the upper surface of the base 254, and a mounting base 258 placed on the upper surface of the base 254. Have.

  One surface of the tilting table 256 in the horizontal direction (contact surface with the glass plate G = back surface) is tilted with respect to the vertical direction (hereinafter also referred to as a tilted surface). The angle of the inclined surface only needs to be an angle at which the laminated 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.

  Further, 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.

  In the pallet 252, the glass plate G is mounted on the upper surface of the mounting table 258 and stacked on the inclined surface of the inclined table 256.

  Further, the glass interleaving paper 260 of the present embodiment is interposed between the glass plates G. The glass interleaf paper 260 is larger 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. In addition, it is preferable that the size of the glass plate G is 2200 mm x 1800 mm or more. As described above, when the size of the glass plate is large, the incidence of defects such as disconnection of the wiring is increased, so that the glass interleaving paper of this embodiment can be suitably applied. Furthermore, 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 more preferably 20 mm or more in both length and width.

  Note that a glass interleaving paper 260 may be similarly interposed between the laminated glass plates G and the inclined table 256, and the front surface of the glass plate G is similarly covered with the glass interleaving paper 260. May be.

  As described above, the glass plate package 250 is formed. In this case, if necessary, a contact plate may be brought into contact with the foremost glass plate G (glass interleaving paper), and a belt-shaped body may be stretched over and fixed to the tilting table 256. A cover may be hung so as to cover the plate G.

  In addition, the glass plate package of this invention is not limited to what laminates | stacks and laminates | stacks the glass plate G like the glass plate package 250 shown in FIG. The glass plate package uses, for example, a pallet capable of horizontally laminating (so-called flat stacking) the glass plates G, such as a plate-shaped body storage container disclosed in Japanese Utility Model Registration No. 3165873. May be.

In the case of flat stacking, the load acting on the glass plate near the bottom and the glass slip sheet becomes large, so foreign matter can easily be transferred from the glass slip sheet to the glass plate, and a large number of sheets could not be loaded. By using slip sheets, a large number of sheets can be stacked. Specifically, the foreign matter transferred from the glass interleaving paper can be suppressed even when the glass interleaving paper is pressed against the glass plate at a surface pressure of 30 g / cm ² or more at a load per unit area.

  In the glass plate package of the present embodiment, various known glass plates are exemplified as the glass plate G. Among them, a glass plate on which elements such as wiring and electrodes as described above 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 examples, and various improvements and modifications can be made without departing from the gist of the present invention. Of course, changes may be made.

  Examples The present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

[Example 1]
A glass interleaving paper was produced using a general glass interleaving 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 measured in accordance with 2 of 0.08% by mass or less and visually observed white foreign matters of 0.14 pieces / m ² or less was used.

The glass interleaving paper produced with this pulp sheet was used for (A) a glass plate for evaluation (0.7 mm thickness, 370 mm × 470 mm size), and glass interleaving paper (number of times: 100 times, time: 4 seconds / Pressure, 0.45 MPa, glass plate temperature for evaluation: 55 ° C., and (B) pure water is supplied (flow rate: 200 cm / min) while conveying the glass plate for evaluation which has been pressed (flow rate: 200 cm / min). 57 L / min), and a total of four roll brushes (roll diameter: φ60, hair diameter: 0.06 mm / close winding, material: nylon, arranged two on the upper side and two on the lower side of the glass plate for evaluation. 612, rotation speed: 300 rpm, distance: top and bottom 0 mm), and the evaluation glass plate was cleaned, and (C) an offline defect inspection system (FPI-6000 series (model number: FPI6090D)) manufactured by Orbotech. All the foreign matters on the cleaned evaluation glass plate are inspected to obtain an image of all foreign matters. (D) The appearance of all foreign matters is visually observed based on the image. When the number of white foreign matters was counted, the total number of foreign matters on the glass interleaving paper was 32/269 m ² , and the number of white foreign matters having a size of 50 μm or less was 10/269 m ² .

[Example 2]
As a raw material, a pulp sheet having an organic matter content measured in accordance with JIS P8224: 2002 of 0.05% by mass or less and white foreign matter observed by visual observation is 0.1 piece / m ² or less was used. Except for the above, glass interleaving paper was produced in the same manner as in Example 1.

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

[Example 3]
As a raw material, a pulp sheet having an organic content of 0.01% by mass or less as measured in accordance with JIS P8224: 2002, and having a white foreign matter of 0.05 / m ² or less when visually observed is used. Except for the above, glass interleaving paper was produced in the same manner as in Example 1.

When the number of white foreign matters having a size of 50 μm or less was counted among all foreign matters, the glass interleaf made with this pulp sheet had a total number of foreign matters of 24 pieces / 269 m ² and a white size of 50 μm or less. The number of foreign matters was 3/269 m ² .

[Comparative Example 1]
As a raw material, a pulp sheet having an organic matter content measured in accordance with JIS P8224: 2002 of 0.1% by mass or less and white particles observed visually is 0.3 pieces / m ² or less, A glass interleaving paper was produced in the same manner as in Example 1 except that paper was made on a line where the resin member was not cleaned.

When the number of white foreign matters having a size of 50 μm or less was counted among all foreign matters, the glass interleaf made with this pulp sheet had a total number of foreign matters of 40/269 m ² , and a white size of 50 μm or less. The number of foreign matters was 15/269 m ² .

[Performance evaluation]
A plurality of glass plates are obtained by interposing the glass interleaving paper prepared in Examples 1 to 3 and Comparative Example 1 between FPD glass plates having a thickness of 0.5 mm and a size of 2500 × 2200 mm. It was set as the laminated glass plate laminated body.

  This glass plate laminate is placed on each glass interleaving paper of Examples 1 to 3 and Comparative Example 1 on a vertically stacked pallet shown in FIG. 6 (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 linear wiring 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 wiring was confirmed.

  The case where 2000 glass plates were used and 20 or less disconnection failures occurred was evaluated as ◯, and the case where more than 20 disconnection failures occurred was evaluated as x.

Table 1 shows the measurement results and the evaluation results. According to Table 1, when the number of white foreign matters having a size of 50 μm or less was 10/269 m ² or less, the evaluation results were all “good”. When the number of white foreign matters having a size of 50 μm or less was larger than 10/269 m ² , the evaluation results were all x.

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

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

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

  DESCRIPTION OF SYMBOLS 10 ... Measuring device, 12 ... Pressing device, 14 ... Cleaning device, 16 ... Defect inspection device, 18 ... Display device, 20 ... Lower surface plate, 22 ... Upper surface plate, 24 ... Cylinder device, 26 ... Suction pad, 28 ... Evaluation Glass plate, 30 ... suction pad, 32 ... dummy glass plate, 34 ... slip paper feeder, 36 ... glass slip paper, 38 ... cylinder body, 40 ... piston, 42 ... slip paper roll, 44 ... winding axis, 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 ... tilting table, 258 ... mounting table, 260 ... glass fitting Paper, 26 ... glass plate laminate

Claims (7)

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 sheet for evaluation (number of times: 100 times, time: 4 seconds / time, pressure: 0.45 MPa, glass plate for evaluation) on a glass plate for evaluation (thickness 0.7 mm, size 370 mm × 470 mm) Temperature: 55 ° C.)
(B) While conveying the glass plate for evaluation which has finished pressing (line speed 200 cm / min), pure water is supplied (flow rate: 57 L / min), two above and below the glass plate for evaluation A total of four roll brushes arranged on the side (roll diameter (inner diameter): φ60, roll diameter (outer diameter): φ80, bristle diameter: 0.06 mm / close winding, material: nylon 612, rotation speed: 300 rpm , Distance: 0 mm above and below)
(C) Using an offline defect inspection system (FPI-6000 series (model number: FPI6090D)) manufactured by Orbotech, inspect all the foreign substances on the cleaned glass plate for evaluation, and obtain an image of all foreign substances.
(D) The external appearance of all the foreign matters is visually observed based on the image, and the number of white foreign matters having a size of 50 μm or less is counted from all the foreign matters. 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. The glass interleaving paper according to claim 2, wherein the number of white foreign matters having a size of 50 μm or less counted by the measuring method is 3/269 m ² or less. Glass interleaving paper as described in any one of Claim 1 to 3 whose content of the organic substance measured based on JISP8224: 2002 is 0.08 mass% or less.   The glass plate laminated body which laminated | stacked the glass interleaving paper and the glass plate as described in any one of Claim 1 to 4 alternately.   A glass plate package comprising the glass plate laminate according to claim 5 and a pallet on which the glass plate laminate is placed.   The glass plate package according to claim 6, wherein the pallet is a pallet on which the glass plate laminate is placed in a flat state.