Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H5/00—Special paper or cardboard not otherwise provided for
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
  • B65D57/002—Separators for articles packaged in stacks or groups, e.g. stacked or nested
  • B65D57/003—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles
  • B65D57/004—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles the articles being substantially flat panels, e.g. wooden planks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
  • B65D85/48—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for glass sheets
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
  • C03B40/02—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it by lubrication; Use of materials as release or lubricating compositions
  • C03B40/033—Means for preventing adhesion between glass and glass
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/63—Inorganic compounds
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/10—Coatings without pigments
  • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
  • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
  • D21H25/005—Mechanical treatment
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

• the paper for packaging the glass plates In the process of laminating and storing and transporting a plurality of glass plates for flat panel displays such as liquid crystal displays, plasma displays, organic electroluminescence (organic EL) displays, etc., the paper for packaging the glass plates, and The present invention relates to paper sandwiched between glass plates and the production of these papers.
• flat panel displays such as liquid crystal displays, plasma displays, organic electroluminescence (organic EL) displays, etc.
• Glass plates for flat panel displays are used for high-definition displays compared to general architectural window glass plates, vehicle window glass plates, etc., so impurities on the glass surface are as much as possible on the glass surface. It is required to have a clean surface, and to have excellent flatness for high-speed response and widening of the viewing angle.
• Patent Document 1 discloses a technique for forming a fluorine coating film on the surface of a slip sheet.
• Patent Document 2 includes a paper sheet in which a polyethylene resin foam sheet and a polyethylene resin film are bonded
• Patent Document 3 includes a paper made of pulp containing 50 mass% or more of exposed chemical pulp.
• Patent Document 4 defines the amount of resin in the paper and considers contamination of the glass surface.
• a glass sheet slip sheet using the prepared raw materials is disclosed.
• the color filter substrate is produced by forming a thin film such as a semiconductor film, an ITO film (transparent conductive film), an insulating film, an aluminum metal film, or the like on a glass plate by sputtering or vacuum evaporation, etc. This is because if there are scratches or contaminants, the circuit pattern formed from the thin film may be disconnected or a short circuit may occur due to a defect in the insulating film.
• a thin film such as a semiconductor film, an ITO film (transparent conductive film), an insulating film, an aluminum metal film, or the like
• An organic EL display is manufactured by forming a thin film such as an ITO anode, an organic light emitting layer, and a cathode on a glass substrate by sputtering, vapor deposition, printing, etc., so that there are cracks, scratches, and contaminants that inhibit the thin film on the surface of the glass substrate. If it exists, a problem of non-light emission occurs.
• one such foreign matter is a foreign matter having a Mohs hardness of 4 or more.
• a glass plate for a flat panel display has a fine circuit formed on its surface, so even if it is a very small amount of foreign matter, its adhesion and cracking and scratches due to the foreign matter are particularly avoided.
• an object of the present invention is to provide a slip sheet for a glass plate that may be brought into contact with either the front or back glass plate.
• the present inventors reduced the amount of foreign matter having a Mohs hardness of 4 or more present on the surface of the interleaf paper for glass plates, and the foreign matters having a Mohs hardness of 4 or more on the front and back surfaces of the interleaving paper. It is found that the difference in the state of the front and back surfaces of the glass sheet slip sheet is suppressed by suppressing the difference in the existence ratio of the glass sheet slip sheet, and either the front or back surface may be brought into contact with the glass sheet.
• the present invention has been completed.
• the first aspect of the present invention is a glass sheet interleaf made of wood pulp,
• the presence ratio of foreign matters having a Mohs hardness of 4 or more present on one surface is less than 10 per 1000 m 2 ,
• the difference between the presence ratio of the foreign matter on one surface and the presence ratio of the foreign matter on the other surface is 4 or less per 1000 m 2 .
• It is a slip sheet for glass plate.
• the foreign matter preferably contains a metal oxide or an inorganic silicon oxide.
• the inorganic silicon oxide is preferably silicon dioxide.
• the foreign matter is one or more selected from the group consisting of iron oxide, copper, quartz, fused quartz, titanium oxide, glass pieces, crystal pieces, magnesium oxide and sand.
• the volume of the foreign matter is preferably less than 2 ⁇ 10 ⁇ 5 mm 3 .
• the basis weight of the interleaving paper for glass plate of the present invention is preferably 20 to 100 g / m 2 .
• the thickness of the interleaf paper for glass plate of the present invention is preferably 0.030 to 0.130 mm.
• the water content of the interleaving paper for glass plate of the present invention is preferably 2 to 10% by mass.
• the glass is preferably used for a display.
• the display is preferably a TFT liquid crystal display or an organic EL display.
• the present invention also relates to a laminate of the glass sheet interleaf and the glass sheet.
• a second aspect of the present invention is a method for producing the above glass sheet interleaving paper, A slurry preparation step for preparing a wood pulp slurry; A sheet forming step for forming the slurry into a sheet; A wet paper web preparation step for dehydrating the sheet to form a wet paper web; Including at least a drying step of drying the wet paper to obtain the slip sheet;
• the present invention relates to a manufacturing method in which dehydration is performed from both sides of the sheet in the wet paper preparation step.
• a difference between the suction dewatering rate on one surface of the sheet and the suction dewatering rate on the other surface is 10% or less of the suction dewatering rate on the other surface.
• the manufacturing method includes an additional suction step of further sucking both sides of the interleaving paper after the drying step.
• the interleaving paper for glass plate of the present invention has a small amount of foreign matter having a Mohs hardness of 4 or more present on the surface, and a difference in the presence ratio of foreign matters having a Mohs hardness of 4 or more on the front and back surfaces of the interleaf is suppressed. Differences in the presence state of foreign matters having a Mohs hardness of 4 or more on the front and back surfaces of the glass sheet interleaf are suppressed. Therefore, either of the front and back surfaces of the slip sheet for glass plate of the present invention may be brought into contact with the glass plate. Thereby, the paper for glass plates of this invention is excellent in the handleability.
• glass sheet interleaving paper is originally wound in a roll shape and shipped.
• the front surface and the back surface of the interleaving paper are in contact with each other in the wound state, for example, there are few foreign matters having a Mohs hardness of 4 or more on the surface. If there is a large amount of foreign matter having a Mohs hardness of 4 or more on the back side, foreign matter having a Mohs hardness of 4 or more on the back side of the slip sheet in the rolled-up state even if the surface of the slip sheet is brought into contact with the surface of the glass plate. It may transfer to the surface and the cleanliness of the surface may be reduced.
• the interleaving paper for glass plate of the present invention suppresses the transfer of foreign matters having a Mohs hardness of 4 or more from one surface of the interleaving paper to the other surface even when it is wound in a roll shape. There is no need to worry about a decrease in the cleanliness of the surface of the interleaving paper due to winding in a roll shape, that is, an increase in the presence ratio of foreign matters having a Mohs hardness of 4 or more.
• the interleaving paper for glass plate of the present invention has a small amount of foreign matter having a Mohs hardness of 4 or more present on the surface, even if the interleaving paper contacts the surface of the glass plate, generation of cracks or scratches on the surface of the glass plate Can be reduced or avoided, and the transfer of foreign matter having a Mohs hardness of 4 or more, which is a problem from the slip sheet to the glass plate, can be effectively suppressed or avoided.
• the first aspect of the present invention is a glass sheet interleaf made of wood pulp,
• the presence ratio of foreign matters having a Mohs hardness of 4 or more present on one surface is less than 10 per 1000 m 2 ,
• the difference between the presence ratio of the foreign matter on one surface and the presence ratio of the foreign matter on the other surface is 4 or less per 1000 m 2 .
• It is a slip sheet for glass plate.
• the fact that the number of foreign matters having a Mohs hardness of 4 or more present on the surface of the interleaving paper for glass plate of the present invention is less than 10 per 1000 m 2 means that the interleaving paper for glass plate of the present invention exists alone. This means that the presence ratio of the foreign matter present on the surface of the slip sheet when the slip sheet for glass plate is not laminated with the glass plate is less than 10 per 1000 m 2 .
• the presence ratio of the foreign matter existing on the surface is less than 10 per 1000 m 2 .
• Wood pulp usable in the present invention includes softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), and thermomechanical pulp (TMP). These are wood pulps such as single or mixed. This wood pulp is the main component, non-wood pulp such as hemp, bamboo, cocoon, kenaf, cocoon, cocoon, cotton etc., modified pulp such as cationized pulp, mercerized pulp, rayon, vinylon, nylon, etc. Synthetic fibers such as acrylic and polyester, chemical fibers, or microfibrillated pulp can be used alone or in combination.
• the pulp may contaminate the glass plate surface. Therefore, chemical pulp with as little resin as possible, for example, softwood bleached kraft pulp, is used alone. It is preferable to do. Also, high yield pulp such as groundwood pulp is not preferred because it contains a large amount of resin.
• mixing synthetic fibers and chemical fibers improves cutting performance and improves workability when making interleaving paper into a lithographic plate. However, care must be taken because recyclability deteriorates in terms of waste disposal. .
• the form of the wood pulp is not particularly limited, and can take any form such as a sheet, a block, or a flake.
• the sheet-like pulp can be obtained using, for example, a pulp machine having four steps of wire part, press part, dry part, and finishing.
• pulp fiber is made using a long mesh or a vacuum filter, and in the press part, it is dehydrated using a roll press.
• dry part it is dried with a cylinder dryer or a fract dryer, and finally both ends of the sheet pulp are cut off and wound up on a roll.
• the block-like pulp can be obtained, for example, by laminating the sheet-like pulp, and the flake-like pulp can be obtained, for example, by pulverizing the sheet-like pulp.
• the thickness of the sheet pulp is preferably 0.7 to 1.5 mm, more preferably 0.9 to 1.3 mm, and even more preferably 1.0 to 1.2 mm. .
• the basis weight of the sheet pulp is preferably 400 to 1300 g / m 2 , more preferably 500 to 1200 g / m 2 , still more preferably 500 to 1100 g / m 2 , and 500 to 1000 g. / M 2 is more preferable, and 700 to 1000 g / m 2 is even more preferable.
• the existence ratio of foreign matters having a Mohs hardness of 4 or more on one surface is limited to less than 10 per 1000 m 2 .
• the number of foreign matters having a Mohs hardness of 4 or more present on one surface of the interleaf paper for glass plate is preferably 8 pieces / 1000 m 2 or less, more preferably 6 pieces / 1000 m 2 or less.
• / 1000 m 2 or less is still more preferable, 3/1000 m 2 or less is still more preferable, 2/1000 m 2 or less is still more preferable, and 1/1000 m 2 or less is preferable. Particularly preferred.
• the difference between the presence ratio of foreign matter having a Mohs hardness of 4 or more on one surface and the presence ratio of foreign matter having a Mohs hardness of 4 or more on the other surface is within 4 per 1000 m 2. and it is preferably not less than 3 per 1000 m 2, more preferably within 2 per 1000 m 2, and still more preferably from not exceed one per 1000 m 2. That is, in the interleaving paper for a glass plate of the present invention, the proportion of foreign matters having a Mohs hardness of 4 or more on one surface is within the above specific range from the proportion of foreign matters having a Mohs hardness of 4 or more on the other surface. It is preferable not to fluctuate greatly.
• the “existence ratio” means the number of foreign matters having a Mohs hardness of 4 or more per unit area on the surface of the slip sheet. For example, a plurality of positions on the surface of the slip sheet for glass plate are magnified by an electron microscope. It can be determined by observing and averaging the number of foreign objects with a Mohs hardness of 4 or more observed at that location. Or, as another method, the surface of a predetermined area of the glass sheet interleaf is sufficiently washed with water, an acidic solution or a basic solution, and the foreign matters having a Mohs hardness of 4 or more are counted by removing the foreign matters having a Mohs hardness of 4 or more. Can be determined.
• the interleaving paper for glass plate of the present invention has a small amount of foreign matter having a Mohs hardness of 4 or more present on the surface, and fluctuations in the presence ratio of foreign matter having a Mohs hardness of 4 or more on the front and back surfaces of the interleaving paper are suppressed. Thereby, the difference in the physical state of the front and back surfaces of the glass sheet interleaf is suppressed. Therefore, in the interleaving paper for glass plate of the present invention, the presence ratio of foreign matters having a Mohs hardness of 4 or more on the surface does not greatly differ between the front and back surfaces of the interleaving paper. Accordingly, the interleaving paper for glass plate of the present invention may be brought into contact with either the front or back surface of the glass plate.
• the foreign material having a Mohs hardness of 4 or more in the present invention may be particles made of either inorganic or organic substances, and inorganic particles are preferred.
• the foreign material include metal oxides or inorganic silicon oxides having a Mohs hardness of 4 or more.
• the metal constituting the metal oxide is not particularly limited as long as the Mohs hardness of the oxide is 4 or more.
• a Group 2 element such as magnesium
• a Group 4 element such as titanium, iron, etc.
• Group 8 elements such as As the inorganic silicon oxide, silicon dioxide is preferable.
• Examples of the foreign matters having a Mohs hardness of 4 or more include oxide minerals.
• Examples of the foreign matters having a Mohs hardness of 4 or more include iron oxide, copper, quartz, fused quartz (quartz glass), titanium oxide, glass pieces, crystal pieces, magnesium oxide, and sand.
• the sand is mainly composed of amphibole with a Mohs hardness of 5.5, feldspar with a Mohs hardness of 6 and quartz with a Mohs hardness of 7. Therefore, the Mohs hardness of sand is 4 or more, typically 7.
• Mohs hardness is an index of hardness expressed in 10 levels. Rubbing the standard material and the material to be measured against each other, the hardness of the standard material is relatively determined by whether or not it is scratched. It is the evaluated value.
• the standard materials were soft (Mohs hardness 1) to hard (Mohs hardness 10) in the order of 1: talc, 2: gypsum, 3: calcite, 4: fluorite, 5: apatite, 6: feldspar, 7: quartz 8: Topaz, 9: Corundum, 10: Diamond.
• the Mohs hardness is measured by preparing two plates having a smooth surface and a known Mohs hardness, sandwiching a foreign substance to be measured between the two plates, and rubbing both plates to check for the presence or absence of scratches on the plate surface.
• the surface of the glass plate is scratched, most of which are derived from raw materials, especially quartz having a Mohs hardness of 7, fused quartz, sand and quartz. It is often a piece, magnesium oxide having a Mohs hardness of 6, titanium oxide and iron oxide, copper having a Mohs hardness of 5-8, and glass piece having a Mohs hardness of 4-7.
• the volume of the foreign matter is preferably controlled to less than 0.00002Mm 3, less than 0.00001mm 3 is more preferable.
• foreign matter is present as a three-dimensional object on the surface or inside of a slip sheet, causing problems.
• the size of the foreign material is 0.00002 mm 3 or more, there is a tendency that the foreign material comes into contact with the surface of the glass plate and leaves scratches or cracks when the slip sheet for glass plate is used.
• foreign matter present on the surface of the slip sheet may be pressed depending on the weight of the glass sheet. Since foreign matter is buried in the paper, the possibility of scratching the glass plate surface is reduced.
• the foreign material is a three-dimensional object as described above, particularly when the projection area is small and there is a height, it can be visually observed as a scratch generated when the glass or the glass sheet interleaf moves. There is a risk of leaving scratches.
• the projected area is large even if the height is low, the surface of the glass plate may be damaged, which is not preferable.
• the foreign matter preferably has a sphere volume equivalent diameter average particle size of 30 ⁇ m or less, more preferably 20 ⁇ m or less, even more preferably 10 ⁇ m or less, and even more preferably 5 ⁇ m or less, It is especially preferable that it is 1 micrometer or less.
• the equivalent sphere volume diameter is a diameter of the sphere when foreign particles are converted to a sphere having the same volume, and can be measured by a laser diffraction method or the like.
• the slip sheet for glass plate of the present invention preferably has a basis weight of 20 to 100 g / m 2 , more preferably 30 to 90 g / m 2, and still more preferably 40 to 80 g / m 2 . If it is less than 20 g / m 2 , it will be difficult to maintain the minimum air resistance (5 seconds or more). There is a risk of it. Furthermore, if it is less than 20 g / m 2 , the stiffness of the glass sheet interleaf itself becomes weak and handling properties are also deteriorated. On the other hand, when the basis weight exceeds 100 g / m 2 , the flexibility as the interleaving paper for the glass plate is impaired and the handling property is deteriorated. In addition, because the glass sheet slip is used for the purpose of transporting, protecting and scratching the glass sheet used, and preventing dirt, it is disadvantageous in terms of cost to increase the basis weight more than necessary, Workability also decreases.
• the thickness of the slip sheet for glass plate of the present invention is preferably 0.030 to 0.130 mm, more preferably 0.040 to 0.120 mm, and still more preferably 0.050 to 0.110 mm. If it is less than 0.030 mm, the protective effect during transportation and storage of the glass plate to be used decreases, which is not preferable. In particular, it is difficult to sufficiently exert a buffer function as a slip sheet, and there is a possibility that it is easily torn due to the thickness being too thin. On the other hand, if the thickness exceeds 0.130 mm, the thickness of the laminate of the glass plate and the interleaving paper for the glass plate is increased, so that the occurrence of storage space, transportation problems, and the like is predicted.
• the water content of the slip sheet for glass plate of the present invention is preferably 2 to 10% by mass, more preferably 3 to 9% by mass, and still more preferably 4 to 8% by mass. If the water content is less than 2% by mass, the glass sheet interleaf itself tends to be charged with static electricity, and a blocking phenomenon due to static electricity occurs between the glass sheet and the glass sheet. On the other hand, if the water content exceeds 10% by mass, the dimensional stability may be deteriorated due to a blocking phenomenon with a glass plate due to excessive water content or a decrease in water content during use.
• the surface electrical resistance value (based on JIS K 6911 1995) of the interleaving paper for the glass plate of the present invention is determined after conditioning the interleaving paper at a temperature of 23 ° C. and a relative humidity of 50% for 24 hours or more. When measured under the same conditions, it is preferably in the range of 1 ⁇ 10 8 to 1 ⁇ 10 13 ⁇ , more preferably in the range of 5 ⁇ 10 8 to 5 ⁇ 10 12 ⁇ , and 1 ⁇ 10 9 to 1 Even more preferably within the range of ⁇ 10 12 ⁇ . When the surface electrical resistance value is less than 1 ⁇ 10 8 ⁇ , the adhesion between the glass plate and the interleaf is reduced, and the handling property may be deteriorated.
• the surface electrical resistance value being less than 1 ⁇ 10 8 ⁇ means that moisture or a conductive substance (for example, a surfactant) was added more than necessary. Excess moisture may adversely affect the dimensional stability of the glass sheet, and most of the conductive substances are organic substances, so these substances migrate to the surface of the glass sheet that comes into contact with them. It may cause problems such as dirt. On the other hand, when the surface electrical resistance value of the glass sheet interleaf exceeds 1 ⁇ 10 13 ⁇ , it becomes easy to be charged with static electricity. May interfere. Examples of a method for adjusting the surface electrical resistance value to a desired range include moisture adjustment by drying or the like.
• the interleaving paper for glass plate of the present invention may contain short fibers having a fiber length of 200 ⁇ m or less, but the short fibers may attract foreign substances, so the content of the short fibers is the absolute dry mass of the interleaving paper. On the other hand, it is preferably 4.5% by weight or less, more preferably 4.0% by weight or less, still more preferably 3.5% by weight or less, and particularly preferably 3.0% by weight or less.
• “fiber length” does not mean the average fiber length. Accordingly, all the short fibers having a fiber length of 200 ⁇ m or less have a fiber length of 200 ⁇ m or less. In other words, the maximum fiber length of the short fibers is 200 ⁇ m or less.
• the fiber length refers to the length of the fiber when the fiber is straightened.
• the average fiber diameter of the short fibers is preferably 10 ⁇ m to 50 ⁇ m, more preferably 12 ⁇ m to 40 ⁇ m, and even more preferably 15 ⁇ m to 30 ⁇ m.
• “average fiber diameter” here refers to a plurality of locations on the surface of the glass sheet interleaf, which are enlarged and observed by an electron microscope, and a predetermined number of fibers are randomly selected from each electron microscope image. The average fiber diameter obtained by measuring and averaging the diameters of the fibers.
• the number of fibers to be selected is 100 or more, preferably 150 or more, more preferably 200 or more, and even more preferably 300 or more.
• the abundance of the short fibers on the surface of the interleaving paper for glass plates of the present invention is preferably 50 to 600 / cm 2 , more preferably 60 to 500 / cm 2 , and 70 to More preferably, it is 400 / cm 2 .
• the amount of short fibers is relatively small, the amount of foreign matter attracted by the short fibers can be reduced.
• the difference between the short fibers on one surface and the short fibers on the other surface is 15% or less of the short fibers on the other surface. Preferably, it is 12% or less, more preferably 10% or less. That is, in the interleaving paper for a glass plate of the present invention, it is preferable that the amount of short fibers on one surface does not vary so much as to be within the above specific range from the amount of short fibers on the other surface.
• the “abundance” means the number of the short fibers on the surface of the slip sheet. For example, a plurality of positions on the surface of the slip sheet for glass plate are enlarged and observed with an electron microscope. It can be determined by averaging the number of short fibers made.
• the short fibers of 200 ⁇ m or less can also be determined by selecting the short fibers of 200 ⁇ m or less from the fibers dropped by rubbing a predetermined area with a sheet or the like with the surface of the interleaf facing downward and obtaining the number per unit area. Furthermore, it can also be determined by dividing the interleaf into two very thin sheets at the center in the thickness direction, making each paper into a slurry, and measuring the number of short fibers of 200 ⁇ m or less in the slurry. . Alternatively, the abundance of short fibers can also be determined by washing the surface of the interleaf paper for glass plate with water sufficiently and supplying the dropped fibers to a fiber length measuring machine.
• the slip sheet for glass plate of the present invention can be produced on the basis of a usual method such as a papermaking method.
• the second aspect of the present invention is a method for producing a glass sheet interleaving paper, A slurry preparation step for preparing a wood pulp slurry; A sheet forming step for forming the slurry into a sheet; A wet paper web preparation step for dehydrating the sheet to form a wet paper web; Including at least a drying step of drying the wet paper to obtain the slip sheet; In the wet paper preparation step, the dehydration is performed from both sides of the sheet slurry.
• wood pulp Usually, various foreign substances are contained in wood pulp.
• foreign materials derived from wood which is the raw material for wood pulp, foreign materials derived from cooking chemicals during pulp production, foreign materials derived from chemicals used in unbleached cleaning processes, metallic foreign materials derived from waste paper materials, or used in each process This may be caused by water-derived foreign matter. Therefore, in this invention, it is preferable to wash
• pulp obtained by cooking wood chips is delignified, and then the pulp is washed and further bleached. Therefore, it is preferable to first remove and clean the chips from the wood chips. For example, it is preferable to remove foreign matters such as metal and sand with a known foreign matter removing system such as a tip washer.
• a known method such as a countercurrent cleaning method using various cleaning devices such as a vacuum filter cleaning machine, a pressure drum type filter cleaning machine, a press type cleaning machine, and a diffuser cleaning machine can be employed.
• the amount of washing water used or to use a multi-stage washing system having two or more rinse washing stages it is preferable to increase the amount of washing water used or to use a multi-stage washing system having two or more rinse washing stages.
• medical agents such as surfactant used at the time of washing
• mineral oil-based antifoaming agents used as antifoaming agents can cause mineral foreign matter in the glass sheet interleaving paper, so the amount of mineral oil-based antifoaming agents used can be reduced or other antifoaming agents can be used. It is preferable to substitute.
• a bleaching step after the washing step there is a bleaching step after the washing step, and it is preferable here to remove foreign matter as much as possible.
• a cleaning device for each bleaching stage.
• a known washing machine can be used.
• a pressure diffuser, a diffusion washer, a pressure drum washer, a horizontal long washer, a press washing machine, or the like can be used.
• various foreign substances can be removed at a high level.
• chemicals such as alkalis, acids, chelating agents, surfactants, and antifoaming agents can be added to the washing water, it is preferable not to use chemicals that cause foreign substances.
• a wood pulp slurry can be prepared by a conventionally known method.
• cellulose fibers constituting the wood pulp are disaggregated to prepare an aqueous suspension to prepare a slurry.
• the above-mentioned slurry if necessary, an adhesive, an antifungal agent, an antifoaming agent, a filler, a wet paper strength enhancer, a dry paper strength enhancer, a sizing agent, Coloring agents, fixing agents, yield improvers, slime control agents and the like can be added.
• an adhesive an antifungal agent, an antifoaming agent, a filler, a wet paper strength enhancer, a dry paper strength enhancer, a sizing agent, Coloring agents, fixing agents, yield improvers, slime control agents and the like can be added.
• it is preferable to pay close attention when adding these chemicals so that insects, dust and the like are not mixed.
• the preferred beating degree is 300 to 650 ml c. s. f. It is.
• the sheet can be formed by a conventionally known method. For example, by discharging the slurry onto a flat wire (for example, a long net paper machine) or by scooping a sheet from the slurry with a wire wound around a cylindrical cylinder (for example, a circular paper machine) , You can get a sheet.
• a flat wire for example, a long net paper machine
• a cylindrical cylinder for example, a circular paper machine
• a dust removing device such as a cleaner or a screen device, or other cleaning devices.
• known devices can be used for these removal methods, such as centrifugal cleaners, special weight cleaners, medium concentration cleaners, lightweight cleaners, hole screens, slit screens, Jansson screens, flat screens, and other washing machines. Can be used.
• foreign substances may be mixed in the piping of the stock or white water, it is preferable to keep the piping etc. clean at all times.
• each facility is made of a material other than iron, or a high magnetic material such as a magnet is installed in the system to selectively remove iron, or the adsorbent that selectively adsorbs iron It is preferable to arrange on the exit side of each facility.
• the selective removal method by installing a high magnetic material can remove not only iron but also other magnetic materials.
• wood pulp with less foreign matter is used as a raw material, and the foreign matter having a Mohs hardness of 4 or more present on the surface of the glass sheet is 1000 m by carefully removing the foreign matter in the paper making process. Less than 10 paper sheets for glass plate per 2 can be produced.
• dehydration is performed from both sides of the sheet in the wet paper preparation step of forming the wet paper by dehydrating the sheet.
• the method of dehydration is arbitrary, and a conventionally known method can be used.
• the sheet can be dehydrated by pressing with a roll.
• the dehydration is preferably performed by suction.
• the sheet extending in the horizontal direction is sandwiched from above and below by a net, and may be dehydrated by suction by a suction device in the vertical direction.
• suction force to the surface and the downward suction force There is a difference between the suction force to the surface and the downward suction force, and more foreign matter having a Mohs hardness of 4 or more remains on the surface of the sheet that is attracted upward compared to the surface of the sheet that is attracted downward. Since there is a fear, it is preferable to dehydrate the sheet by sandwiching the sheet extending in the vertical direction with a net and sucking it in the left-right direction. In this case, it is preferable to maintain the moving direction of the wet paper so as to be in the vertical direction or in an inclined range within 30 ° from the vertical direction.
• suction dewatering rate (dewatering rate) on one surface of the sheet is 10 of the suction dewatering rate (dewatering rate) on the other surface. % Or less is preferable. That is, in the method for producing a glass sheet slip sheet of the present invention, it is preferable that suction from both sides of the sheet is performed with substantially the same suction force.
• the sheet forming step and the wet paper web preparation step may be performed separately using separate devices, but may be performed continuously or partially overlapping in the same device.
• the wet paper may be formed by dewatering while placing the slurry on a wire (net) to form a sheet.
• the interleaf paper can be obtained by drying wet paper by a conventionally known method using a dryer roll or the like.
• an additional suction step of further sucking both surfaces of the slip sheet after the drying step It is preferable to contain.
• calendering may be performed during and / or after papermaking of the glass sheet interleaf.
• Surface properties and thickness can be adjusted by processing.
• the glass sheet slip sheet of the first aspect of the present invention can be efficiently manufactured by the manufacturing method of the second aspect of the present invention.
• the glass sheet slip sheet of the present invention is used by being inserted between the glass sheets.
• the glass sheet interleaving paper is typically inserted one by one between a plurality of glass sheets to form a laminated body as a whole, and the laminated body is a target for storage and transportation.
• a glass plate for flat panel displays, such as a plasma display panel, a liquid crystal display panel (especially TFT liquid crystal display panel), and an organic electroluminescent display panel.
• Fine electrodes, partition walls, etc. are formed on the surface of the glass plate for flat panel display, but by using the glass plate slip sheet of the present invention, cracks and scratches that become a problem of the glass plate, and Since the transfer of foreign matter that becomes a problem to the glass plate is suppressed or avoided, even if fine electrodes, partition walls, or the like are formed on the surface of the glass plate, inconvenience due to the foreign matter can be suppressed or avoided, and as a result In addition, display defects can be suppressed or avoided.
• the size and weight of a glass plate for a flat panel display have increased with the increase in the size of the display.
• the slip sheet for a glass plate of the present invention has the surface of such a large or heavy glass plate. It can be well protected.
• the interleaving paper for glass plate of the present invention has a very small content of foreign matter having a Mohs hardness of 4 or more, the occurrence of cracks and scratches on the surface of the glass plate is reduced or avoided even when pressed by a heavy glass plate.
• the transfer of foreign matter to the glass plate surface is suppressed or avoided. Therefore, the interleaving paper for a glass plate of the present invention can be suitably used for a glass plate for a flat panel display in which surface cleanliness is particularly required.
• the slip sheet for glass plate of the present invention is excellent in handleability. For example, it is not necessary to sandwich two interleaving papers between glass plates and direct the surface of each interleaving paper that has a smaller amount of foreign matter to the glass plate. Further, even when the paper is wound up in a roll shape, there is no need to worry about the deterioration of the cleanliness of the surface of the slip sheet due to the transfer of foreign matters having a Mohs hardness of 4 or more from one surface of the slip sheet to the other surface. .
• a softwood bleached kraft pulp B was obtained in the same manner as described above except that the inline box provided with the magnet bar was not used.
• Example 1 80 parts by weight of softwood bleached kraft pulp A and 20 parts by weight of softwood bleached kraft pulp B were prepared as wood pulp, and this was disaggregated to give a beating degree of 520 mlc. s. f. 0.4 parts by mass of polyacrylamide (trade name: Polystron 1254, manufactured by Arakawa Chemical Industries, Ltd.) as a paper strength enhancer was added to the prepared slurry, and a pulp slurry having a concentration of 0.4% by weight. Was prepared.
• polyacrylamide trade name: Polystron 1254, manufactured by Arakawa Chemical Industries, Ltd.
• This paper was made using a long paper machine equipped with an on-top former in the wire part, and dehydrated from both sides of the wet paper by the on-top former to obtain a slip sheet for a glass plate having a basis weight of 55 g / m 2 . .
• Example 2 A glass sheet interleaf with a basis weight of 55 g / m 2 was obtained in the same manner as in Example 1 except that 0.7 parts by mass of polyacrylamide was added.
• Example 1 A glass sheet slip with a basis weight of 55 g / m 2 was obtained in the same manner as in Example 1 except that the on-top former was not used.
• Example 2 A glass sheet interleaf having a basis weight of 55 g / m 2 was obtained in the same manner as in Example 1 except that 50 parts by mass of the softwood bleached kraft pulp A and 50 parts by mass of the softwood bleached kraft pulp B were used.
• Example 1 The presence ratio of foreign matters having a Mohs hardness of 4 or more on the front and back surfaces of the interleaf paper for glass plates of Example 1, Example 2, Comparative Example 1 and Comparative Example 2 was as follows.
• the front surface was 5 pieces / 1000 m 2 and the back surface was 1 piece / 1000 m 2 .
• Example 2 the front surface was 9 pieces / 1000 m 2 and the back surface was 5 pieces / 1000 m 2 .
• Comparative Example 1 the front surface was 13 pieces / 1000 m 2 and the back surface was 6 pieces / 1000 m 2 .
• the front surface was 7 pieces / 1000 m 2 and the back surface was 2 pieces / 1000 m 2 .
• Example 1 The glass sheet slip sheets of Example 1, Example 2, Comparative Example 1 and Comparative Example 2 were subjected to the transportation test.
• any of the front and back surfaces of the interleaving paper may be brought into contact with the glass plate. No disconnection of the color film was observed.

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• 2019
  • 2019-03-25 TW TW108110309A patent/TWI701195B/zh active
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  • 2019-03-25 CN CN201980001699.4A patent/CN111886186B/zh active Active
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