CN110446813B

CN110446813B - Liner paper for glass plate and its making method

Info

Publication number: CN110446813B
Application number: CN201880003358.6A
Authority: CN
Inventors: 浅井靖彦; 西村孝之
Original assignee: Tokushu Tokai Paper Co Ltd
Current assignee: Tokushu Tokai Paper Co Ltd
Priority date: 2017-03-30
Filing date: 2018-03-29
Publication date: 2022-02-25
Anticipated expiration: 2038-03-29
Also published as: TW201840929A; KR20180135855A; KR102064252B1; JP6598229B2; TWI729282B; WO2018181658A1; CN110446813A; JPWO2018181658A1

Abstract

The present invention relates to a backing paper for glass sheets, which is made of wood pulp and has a short fiber content of 200 [ mu ] m or less of 10.5% by mass or less. The liner paper for glass sheets of the present invention can solve the problems caused by different front and back surfaces.

Description

Liner paper for glass plate and its making method

Technical Field

The present invention relates to a paper for packaging glass plates and a paper sandwiched between glass plates in the process of stacking and storing and transporting a plurality of glass plates for flat panel displays such as liquid crystal displays, plasma displays, and organic electroluminescence (organic EL) displays, and a method for producing the paper.

Background

In general, in the process of storing a plurality of flat panel panels/glass plates for displays in a stacked state, in order to prevent the glass plates from being scratched due to collision or contact with each other during the distribution process of transportation by a truck or the like and to prevent the surfaces of the glass plates from being contaminated by contaminants from the outside, a paper called a interleaving paper is sandwiched between the glass plates.

Since the flat panel/glass/plate for display is used for a high-definition display, the glass surface is required to have a clean surface with as few impurities as possible contained in the paper surface, and to have excellent flatness for maintaining high-speed response and widening the viewing angle, as compared with a general window glass plate for building , a window glass plate for vehicle, and the like.

As the interleaving paper used in such applications, several types of interleaving paper capable of preventing cracks of the glass sheet and damage of the surface and interleaving paper not contaminating the glass surface have been proposed. For example, patent document 1 discloses a method of forming a fluorine coating film on the surface of a backing paper. Patent document 2 discloses a backing paper in which a foamed sheet made of a polyethylene resin and a film made of a polyethylene resin are laminated, patent document 3 discloses a paper composed of a pulp containing bleached chemical pulp in an amount of 50% by mass or more, a backing paper for glass containing a specific alkylene oxide adduct and a water-soluble polyether-modified silicone, and patent document 4 discloses a backing paper for glass sheets in which the amount of a resin component in the paper is specified and a raw material in consideration of surface contamination of glass is used.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2012-188785

[ patent document 2] Japanese patent application laid-open No. 2010-242057

[ patent document 3 ] Japanese patent application laid-open No. 2008-208478

[ patent document 4 ] Japanese patent laid-open No. 2006-44674

Disclosure of Invention

Problems to be solved by the invention

For example, it is known that when a non-color filter substrate is produced in an array process, which is one of the processes for manufacturing a TFT liquid crystal display, the surface of a glass plate is contaminated, which causes problems such as disconnection. In the case of manufacturing a color filter substrate by forming a thin film such as a semiconductor film, an ITO film (transparent conductive film), an insulating film, or an aluminum metal film on a glass plate by sputtering, vacuum deposition, or the like, a circuit pattern formed of the thin film is broken or short-circuited due to a defect of the insulating film when a contaminant is present on the surface of the glass plate. In addition, when a color filter substrate is manufactured, a pattern is formed on a glass plate by photolithography, and when a contaminant exists on the surface of the glass plate during the photoresist coating process, a pinhole is formed in the photoresist film after exposure and development, and as a result, disconnection and short circuit occur. The same problem was confirmed in the production of organic EL displays. Since an organic EL display is manufactured by forming a thin film such as an ITO anode, an organic light-emitting layer, or a cathode on a glass substrate by sputtering, vapor deposition, or printing, if foreign matter that obstructs the thin film is present on the surface of the glass substrate, there is a problem that no light is emitted.

Although the cause of such contamination of the glass sheet is difficult to determine, it has been found that one of the causes thereof is fine foreign matter transferred from the surface of the interleaving paper for glass sheet to the surface of the glass sheet.

In addition, it has been found that short fibers contained in the interleaving paper for glass sheets attract such foreign matters.

However, when the glass sheet is sandwiched between the glass sheets by the spacer paper, if there is a difference in the physical state of the front and back surfaces of the spacer paper, it is sometimes necessary to consider that a specific surface of the spacer paper is brought into contact with the surface of the glass sheet. For example, in order to form a fine circuit or the like on the surface of a flat panel or a glass plate for a display, adhesion of a small amount of foreign matter is particularly prohibited, and when there are more short fibers on one surface of a sheet of spacer paper for a glass plate than on the other surface, the short fibers attract foreign matter and the risk of the foreign matter migrating to the surface of the glass plate increases. In this case, it is considered that two interleaving papers are sandwiched between the glass plates and the surface of each interleaving paper having a small amount of short fibers is faced to the glass plates, but the use amount of the interleaving paper is increased, and the weight of the stacked body of the interleaving paper and the glass plates is increased, which is not preferable from the viewpoint of handling.

The present invention addresses the above problems caused by the difference in the state of the front and back surfaces of a sheet of interleaving paper for glass sheets. In particular, an object of the present invention is to provide a backing paper for glass sheets, which can bring either one of front and back surfaces into contact with a glass sheet.

Means for solving the problems

As a result of intensive studies, the present inventors have found that originally by reducing the amount of short fibers contained in a glass sheet-lining paper, it is possible to suppress the difference in the amount of short fibers present in the front and back surfaces of the lining paper, thereby suppressing the difference in the state of the front and back surfaces of the glass sheet-lining paper, and further, it is possible to provide a glass sheet-lining paper in which both the front and back surfaces can be brought into contact with a glass sheet, and have completed the present invention.

The first embodiment of the present invention is a linerboard for glass panels using wood pulp as a raw material, having a content of short fibers having a fiber length of 200 μm or less of 10.5% by mass or less.

Preferably, the content of the short fiber is 1.2% by mass or more.

Preferably, the average fiber diameter of the short fibers is 10 to 50 μm.

Preferably, the short fibers are present on the surface of the glass liner paper in an amount of 300 to 850 pieces/m 2.

Preferably, the difference between the amount of the short fibers present on one surface of the glass liner paper and the amount of the short fibers present on the other surface is 15% or less of the amount of the short fibers present on the other surface.

Preferably, the thickness of the interleaving paper for glass plate is 20 to 200 μm.

Preferably, the average deviation of friction coefficient (MMD) of the surface of the interleaving paper for glass sheets obtained by the KES method is 0.022 or less.

The glass plate is preferably used in a display, more preferably a TFT liquid crystal display or an organic EL display.

A second embodiment of the present invention relates to a method for manufacturing a linerboard for a glass sheet, the method including at least:

a pulp preparation step of preparing a pulp of the wood pulp;

a sheet forming step of forming the slurry into a sheet shape;

a wet paper production step of dehydrating the sheet to form a wet paper; and

a drying step of drying the wet paper to obtain the interleaving paper,

wherein the dewatering is performed from both sides of the sheet in the wet paper making process.

The dewatering is preferably performed by suction.

Preferably, the difference between the suction dewatering ratio of one surface of the sheet and the suction dewatering ratio of the other surface is 10% or less of the suction dewatering ratio of the other surface.

Preferably, the manufacturing method further comprises an additional suction step of further sucking both sides of the liner paper after the drying step.

The present invention also relates to a laminate of the interleaving paper for glass sheets and the glass sheet according to the first embodiment of the present invention.

The present invention also relates to a glass sheet protection method including a step of disposing the interleaving paper for glass sheets according to the first embodiment of the present invention between glass sheets.

Effects of the invention

The glass sheet-lining paper of the present invention contains a small amount of short fibers, and therefore, the difference in the amount of short fibers present on the front and back surfaces of the lining paper is suppressed, and the difference in the state of the front and back surfaces of the glass sheet-lining paper is suppressed. Therefore, either one of the front and back surfaces of the interleaving paper for glass sheets of the present invention can be brought into contact with the glass sheet. Thus, the interleaving paper for glass sheets of the present invention is excellent in workability.

Further, although the interleaving paper for glass sheets is originally wound in a roll shape and then shipped, since the front (surface) side and the back side of the interleaving paper are in contact in such a wound state, for example, if there are a lot of short fibers on the back side, the short fibers on the surface of the interleaving paper are transferred to the back side in the wound state even if the back side of the interleaving paper is brought into contact with the surface of the glass sheet, and the cleanability of the back side may be deteriorated.

However, since the interleaving paper for glass sheets of the present invention prevents short fibers from being transferred from one surface of the interleaving paper to the other surface even when the interleaving paper is wound in a roll shape, there is no fear that the cleanness of the surface of the interleaving paper is decreased when the interleaving paper is wound in a roll shape.

Further, the backing paper for glass sheets of the present invention can effectively suppress or even avoid the problem of transfer of fine foreign matters from the backing paper to a glass sheet because the amount of short fibers attracting foreign matters is small. In this way, by controlling and preventing the transfer of problematic fine foreign matters onto the glass plate, it is possible to prevent the circuit breaking of the color film or the like in the manufacturing process of the TFT liquid crystal display or the like.

Detailed Description

The first embodiment of the present invention is a linerboard for glass sheets using wood pulp as a raw material, having a content of short fibers having a fiber length of 200 μm or less of 10.5% by mass or less based on the weight of the linerboard for glass sheets.

Wood pulp such as bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP), bleached softwood sulfite pulp (NBSP), bleached hardwood sulfite pulp (LBSP), and thermomechanical pulp (TMP) is used alone or in combination as the wood pulp usable in the present invention. The wood pulp is used as a main body, and if necessary, non-wood pulp such as hemp, bamboo, straw, kenaf, paper mulberry, twigs and kapok, modified pulp such as cationized pulp and mercerized pulp, synthetic fiber such as rayon, vinylon, nylon, acrylic acid and polyester, chemical fiber or microfibrillated pulp are separately mixed, or these are mixed and used together. However, if the pulp contains a large amount of resin components, the resin components may have adverse effects such as staining the surface of the glass plate, and therefore, it is preferable to use chemical pulp, for example, bleached softwood kraft pulp, having as little resin components as possible alone. In addition, high-yield pulps such as ground wood pulp are not preferable because they contain many resin components. Further, when synthetic fibers and chemical fibers are mixed, the shaving performance is improved, the workability when producing a liner paper into a flat plate is improved, and the recyclability is deteriorated in view of waste disposal, and therefore, attention is required.

The form of the wood pulp is not particularly limited, and may be any of a sheet form, a block form, and a frame form. The sheet-like pulp can be obtained using, for example, a pulp machine including four processes of a line section, a press section, a drying section, and a finishing section. The line part uses fourdrinier wire and vacuum filter to make paper from pulp fiber, and the press part uses roller press to dewater. The drying section is dried using a drum dryer, a crushing dryer, or the like, and finally both ends of the sheet-like pulp are cut off and wound into rolls. This method is described in detail in "list of pulp manufacturing techniques" and "book of pulp manufacturing techniques" published by the pulp technology association. Further, for example, the sheet-like pulp may be laminated to obtain a block-like pulp, or the sheet-like pulp may be pulverized to obtain a sheet-like pulp.

The thickness of the sheet-like pulp is preferably 0.7 to 1.5mm, more preferably 0.9 to 1.3mm, and further preferably 1.0 to 1.2 mm.

The sheet-like pulp preferably has a mass per unit area of 400 to 1300g/m²More preferably 500 to 1200g/m²More preferably 500 to 1100g/m²More preferably 500 to 1000g/m²More preferably 700 to 1000g/m²。

The backing paper for glass sheets of the present invention is limited to a content of short fibers having a fiber length of 200 μm or less of 10.5% by mass or less based on the weight of the backing paper. The content of the short fibers is preferably 10.0% by mass or less, more preferably 9.5% by mass or less, and further more preferably 9.0% by mass or less.

On the other hand, from the viewpoint of maintaining the strength of the interleaving paper and adjusting the air permeability, it is preferable that the content of the short fibers having a fiber length of 200 μm or less contained in the interleaving paper for glass sheets of the present invention is not 0, more preferably 0.5% by mass or more, further more preferably 0.8% by mass or more, and further more preferably 1.2% by mass or more.

The short fibers have a fiber length of 200 μm or less. Here, "fiber length" is not an average fiber length. Therefore, all of the short fibers having a fiber length of 200 μm or less have a fiber length of 200 μm or less. In other words, the maximum fiber length of the short fibers is 200 μm or less. Here, the fiber length means the length of the fiber in a state where the fiber is straightened. For example, the content of short fibers having a fiber length of 200 μm or less can be measured by making a liner paper into a pulp and measuring the number of short fibers of 200 μm or less in the pulp.

The average fiber diameter of the short fibers is preferably 10 to 50 μm, more preferably 12 to 40 μm, and still more preferably 15 to 30 μm. In addition, the "average fiber diameter" herein means the number average fiber diameter of the above-mentioned short fibers. For example, the average fiber diameter can be obtained by observing a plurality of portions of the surface of the glass-plate interleaving paper under an electron microscope, randomly screening a specific number of fibers from each electron microscope image, measuring the diameters of the screened fibers, and averaging the diameters. The number of fibers to be screened is 100 or more, preferably 150 or more, more preferably 200 or more, and further more preferably 300 or more. For example, the average fiber diameter of the short fibers can be measured by making a liner paper into a pulp and averaging the fiber diameters of the short fibers of 200 μm or less in the pulp.

The short fibers are preferably present on the surface of the interleaving paper for glass sheets in an amount of 300 to 850 fibers/m²More preferably 330 to 800 roots/m²More preferably 350 to 750 roots/m². The amount of foreign matter attracted by the short fibers can be reduced by relatively small amounts of short fibers.

In the linered paper for glass sheets of the present invention, the difference between the amount of short fibers present on one surface and the amount of short fibers present on the other surface is preferably 15% or less, more preferably 12% or less, and still more preferably 10% or less of the amount of short fibers present on the other surface. That is, in the linered paper for glass sheets of the present invention, it is preferable that the degree of the presence amount of short fibers on one surface is within the above specific range from the presence amount of short fibers on the other surface is not largely changed. Here, the "existing amount" means the average number of the short fibers per unit area of the surface of the linered paper, and the existing amount of the short fibers can be determined by sufficiently washing the surface of a specific area of the linered paper for glass plate with water and supplying the peeled fibers to a fiber length measuring machine.

The glass sheet-lining paper of the present invention contains a small amount of short fibers, and therefore, variation in the amount of short fibers present on the front and back surfaces of the lining paper can be suppressed, thereby suppressing the difference in physical state between the front and back surfaces of the glass sheet-lining paper. In particular, the amount of foreign matter attracted by the short fibers is reduced, and the amount of foreign matter present on the front and back surfaces of the liner paper is not greatly different. Therefore, either one of the front and back surfaces of the interleaving paper for glass sheets of the present invention can be brought into contact with the glass sheet.

In the present invention, the foreign matter that is a problem is fine foreign matter that contaminates the surface of the glass sheet.

The foreign matter may be either a solid or a liquid. The size of the foreign matter is not particularly limited, but is 0.1 to 50 μm, preferably 0.1 to 40 μm. More preferably 0.1 to 30 μm. By "size" herein is meant the volume average (median) particle diameter. The volume average particle diameter can be measured by, for example, a laser diffraction scattering method.

The foreign matter may comprise a hydrophobic substance. In addition, the foreign matter may be composed of only a hydrophobic substance.

The hydrophobic substance is not particularly limited. The hydrophobic substance is preferably nonvolatile, and the oil (excluding silicone oil, more preferably selected from the group consisting of, for example, aliphatic hydrocarbons, vegetable oils, animal oils, synthetic glycerin, aliphatic alcohols, fatty acids, aliphatic alcohols and/or fatty acid esters), resins (excluding silicones), silicones, asphalts, rubbers, and talc, particularly talc having hydrophobic foreign substances adsorbed thereon, and even more preferably selected from the group consisting of, particularly, silicones and talc (particularly talc having hydrophobic foreign substances adsorbed thereon).

Examples of the aliphatic hydrocarbon include straight-chain or branched-chain hydrocarbons, particularly mineral oil (e.g., liquid paraffin), paraffin, vaseline, that is, petrolatum, naphthalene, and the like; hydrogenated polyisobutenes and decene/butene copolymers such as hydrogenated polyisobutene, isoeicosane, decene, PARLEAM and the like; and mixtures of these.

Examples of the other aliphatic hydrocarbons include straight-chain or branched-chain, and optionally cyclic C6-C16 lower alkanes. Examples which may be mentioned include hexane, undecane, dodecane, tridecane and isoparaffins such as isohexadecane and isodecane.

Examples of vegetable oils include linseed oil, camellia oil, macadamia nut oil, sunflower oil, apricot oil, soybean oil, Arara oil, hazelnut oil, corn oil, olive oil, avocado oil, camellia oil, castor oil, safflower oil, jojoba oil, almond oil, grapeseed oil, sesame oil, peanut oil, and mixtures thereof.

Examples of animal oils include mink oil, squalane, perhydrosqualane and squalene.

Examples of the synthetic glycerin include caprylic/capric triglycerol.

The fatty acids should be in an acidic form (that is, not in the form of salts, in order to avoid soap formation), saturated or unsaturated, containing 6 to 30 carbon atoms, especially 9 to 30 carbon atoms, optionally substituted with one or more hydroxyl groups, especially 1 to 4 hydroxyl groups. When the fatty acid is unsaturated, the compound may contain 1 to 3 conjugated or non-conjugated carbon-carbon double bonds. The fatty acid is selected from, for example, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, and isostearic acid.

The term "aliphatic alcohol" as used herein means any saturated, straight-chain or branched-chain C8-C30 alcohol, substituted with optionally selected, especially one or more hydroxyl groups (especially 1-4).

Among the aliphatic alcohols, C12-C22 aliphatic alcohols are preferable, and C16-C18 saturated aliphatic alcohols are more preferable. Among these fatty alcohols, lauryl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, behenyl alcohol, undecyl alcohol, myristyl alcohol, and mixtures of these fatty alcohols may be mentioned.

Examples of the esters of fatty acids and/or aliphatic alcohols include esters of saturated or unsaturated linear or branched C1 to C26 aliphatic monocarboxylic or polycarboxylic acids and esters of saturated or unsaturated linear or branched C1 to C26 aliphatic monohydric or polyhydric alcohols, and the total number of carbons in the esters is preferably 10 or more.

The resin (excluding silicone) is not particularly limited as long as it is a hydrophobic resin. Examples of the resin include thermoplastic resins such as polyolefin, polystyrene, poly (meth) acrylate, polyacrylamide, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyester, polycarbonate, polyamide, and polyimide, thermosetting resins such as polyurethane, melamine, and urea resins, and mixtures of these resins.

As the silicone, silicone oil can be cited. The silicone oil has hydrophobicity, and its molecular structure may be any of cyclic, straight-chain and branched. The dynamic viscosity of the silicone oil at 25 ℃ is usually 0.65-100,000 mm²The thickness of the film may be in the range of 0.65 to 10,000mm²In the range of/s.

Examples of the silicone oil include linear organopolysiloxanes, cyclic organopolysiloxanes, and branched organopolysiloxanes.

Examples of the linear organopolysiloxane, cyclic organopolysiloxane, and branched organopolysiloxane include those represented by the following general formulae (1), (2), and (3):

R¹ ₃SiO-(R¹ ₂SiO)_a-SiR¹ ₃ (1)

[ CHEM 1]

R¹ _(4-c)Si(OSiR¹ ₃)_c (3)

(in the formula, wherein,

R¹each independently a hydrogen atom, a hydroxyl group or a group selected from the group consisting of substituted or unsubstituted monovalent hydrocarbon groups and alkoxy groups,

a is an integer of 0 to 1000,

b is an integer of 3 to 100,

c is an integer of 1 to 4, preferably an integer of 2 to 4)

An organopolysiloxane represented.

The substituted or unsubstituted monovalent hydrocarbon group is typically a substituted or unsubstituted monovalent saturated hydrocarbon group having 1 to 30 carbon atoms, preferably 1 to 10 carbon atoms, and more preferably 1 to 4 carbon atoms; a monovalent unsaturated hydrocarbon group having 2 to 30 carbon atoms, preferably 2 to 10 carbon atoms, and more preferably 2 to 6 carbon atoms, which may be substituted or unsubstituted; a monovalent aromatic hydrocarbon group having 6 to 30 carbon atoms, more preferably 6 to 12 carbon atoms.

Examples of the monovalent saturated hydrocarbon group having 1 to 30 carbon atoms include straight-chain or branched alkyl groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, and decyl, and cycloalkyl groups such as cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl.

Examples of the monovalent unsaturated hydrocarbon group having 2 to 30 carbon atoms include a straight-chain or branched alkenyl group such as a vinyl group, a 1-propenyl group, an allyl group, an isopropenyl group, a 1-butenyl group, a 2-butenyl group, a pentenyl group, or a hexenyl group; cycloalkenyl groups such as cyclopentenyl and cyclohexenyl; cycloalkenyl alkyl groups such as cyclopentenylethyl, cyclohexenylethyl, cyclohexenylpropyl and the like; and alkynyl groups such as ethynyl and propynyl.

Examples of the monovalent aromatic hydrocarbon group having 6 to 30 carbon atoms include aryl groups such as phenyl, tolyl, xylyl, mesityl, and the like. Preferably phenyl. In the present specification, the aromatic hydrocarbon group includes a group obtained by compounding an aromatic hydrocarbon and an aliphatic saturated hydrocarbon, in addition to a group consisting of only aromatic hydrocarbon groups. Examples of the group obtained by combining an aromatic hydrocarbon and a saturated hydrocarbon include aralkyl groups such as benzyl and phenethyl.

The hydrogen atom on the monovalent hydrocarbon group may be substituted with 1 or more substituents selected from the group consisting of, for example, halogen atoms (fluorine atom, chlorine atom, bromine atom, and iodine atom), and organic groups including hydroxyl group, carbinol group, epoxy group, glycidyl group, acyl group, carboxyl group, amine group, methacrylic group, mercapto group, amide group, oxyalkylene group, and the like. Specific examples thereof include 3,3, 3-trifluoropropyl group, 3-chloropropyl group, 3-hydroxypropyl group, 3- (2-hydroxyethoxy) propyl group, 3-carboxypropyl group, 10-carboxydecyl group, and 3-isocyanatopropyl group.

Examples of the alkoxy group include a methoxy group, an ethoxy group, and a propoxy group, and a methoxy group or an ethoxy group is preferable, and a methoxy group is more preferable.

More specifically, examples of the linear organopolysiloxane include trimethylsiloxy-terminated dimethylpolysiloxane (low-viscosity dimethylpolysiloxane such as 2 mPa.s and 6 mPa.s or high-viscosity dimethylpolysiloxane such as 100 ten thousand mPa.s) at both ends of the molecular chain, organohydrogenpolysiloxane, methylphenylpolysiloxane having both ends of the molecular chain blocked with trimethylsiloxy groups, dimethylsiloxane-methylphenylsiloxane copolymer having both ends of the molecular chain blocked with trimethylsiloxy groups, diphenylpolysiloxane having both ends of the molecular chain blocked with trimethylsiloxy groups, dimethylsiloxane-diphenylsiloxane copolymer having both ends of the molecular chain blocked with trimethylsiloxy groups, trimethylpentaphenyltrisiloxane, phenyl (trimethylsiloxy) siloxane, methylalkylpolysiloxane having both ends of the molecular chain blocked with trimethylsiloxy groups, poly (meth) siloxane, and poly (meth) siloxane, Dimethylpolysiloxane-methylalkylsiloxane copolymer blocked with trimethylsiloxy groups at both ends of the molecular chain, dimethylsiloxane-methyl (3,3, 3-trifluoropropyl) siloxane copolymer blocked with trimethylsiloxy groups at both ends of the molecular chain, alpha, omega-dihydroxypolydimethylsiloxane, alpha, omega-diethoxypolydimethylsiloxane, 1,1,1,3,5,5, 5-heptamethyl-3-octyltrisiloxane, 1,1,1,3,5,5, 5-heptamethyl-3-dodecyltrisiloxane, 1,1,1,3,5,5, 5-heptamethyl-3-hexadecyltrisiloxane, tri-trimethylsiloxymethylsilane, tri-trimethylsiloxyalkylsilane, Tetra-trimethylsiloxysilane, tetramethyl-1, 3-dihydroxydisiloxane, octamethyl-1, 7-dihydroxytetrasiloxane, hexamethyl-1, 5-diethoxytrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, higher alkoxy-modified silicones, higher fatty acid-modified silicones, dimethylsiloxane and the like.

Examples of the cyclic organopolysiloxane include hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6), 1-diethylhexamethylcyclotetrasiloxane, phenylheptamethylcyclotetrasiloxane, 1-diphenylhexamethylcyclotetrasiloxane, 1,3,5, 7-tetravinyltetramethylcyclotetrasiloxane, 1,3,5, 7-tetramethylcyclotetrasiloxane, 1,3,5, 7-tetracyclohexyltetramethylcyclotetrasiloxane, tris (3,3, 3-trifluoropropyl) trimethylcyclotrisiloxane, 1,3,5, 7-tetrakis (3-methacryloxypropyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis (3-acryloyloxypropyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis (3-carboxypropyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis (3-vinyloxypropyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis (p-vinylphenyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis [3- (p-vinylphenyl) propyl ] tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis (N-acryloyl-N-methyl-3-aminopropyl) tetramethylcyclotetrasiloxane, 1,3,5, 7-tetrakis (N, N-bis (lauroyl) -3-aminopropyl) tetramethylcyclotetrasiloxane and the like.

Examples of the branched organopolysiloxane include methyltris-trimethylsiloxysilane, ethyltris-trimethylsiloxysilane, propyltris-trimethylsiloxysilane, tetra-trimethylsiloxysilane, and phenyltris-trimethylsiloxysilane.

The silicone oil in the present invention is preferably dimethyl polysiloxane, diethyl polysiloxane, methylphenyl polysiloxane, polydimethyl-polydiphenylsiloxane copolymer, polymethyl-3, 3, 3-trifluoropropylsiloxane, or the like. As the silicone in the present invention, dimethylpolysiloxane is typical.

The silicone oil in the present invention may be a modified silicone oil. Examples of the modified silicone oil include polyoxyethylene modified silicone oils.

The polyoxyethylene-modified silicone oil is a polyoxyethylene-modified silicone oil having a polyoxyalkylene group bonded to the molecule via a silicon-carbon bond, and is preferably a silicone oil which exhibits water solubility at room temperature, specifically at 25 ℃, and more preferably a nonionic polyoxyethylene-modified silicone oil.

Specifically, the polyoxyethylene-modified silicone oil is, for example, a copolymer of a silicone oil composed of a linear or branched siloxane and polyoxyethylene, and there are various polyoxyethylene-modified silicone oils, and a polyoxyethylene-modified silicone oil represented by the following formula (4) is particularly preferable.

R² ₃SiO-(R¹ ₂SiO)_d-(R¹ASiO)_e-SiR² ₃ (4)

(in the formula, R¹Each of which is independently the same as described above,

R²each independently of the other is R1 or A,

a is each independently from R³Group represented by G, R³Is a substituted or unsubstituted divalent hydrocarbon group, G represents a polyoxyalkylene group comprising at least one C2-5 alkylene oxide such as ethylene oxide or propylene oxide,

d represents an integer of 1 to 500,

e represents an integer of 1 to 50).

Examples of the substituted or unsubstituted divalent hydrocarbon group include linear or branched divalent hydrocarbon groups having 1 to 30 carbon atoms, and specific examples thereof include linear or branched alkylene groups having 1 to 30 carbon atoms such as methylene, dimethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, etc.; an alkenylene group having 2 to 30 carbon atoms such as a vinylene group, an arylene group, a butenylene group, a hexenylene group, an octenylene group, or the like; arylene groups having 6 to 30 carbon atoms such as phenylene and diphenylene; an alkylenearylene group having 7 to 30 carbon atoms such as a dimethylenephenylene group; and at least a part of hydrogen atoms bonded to carbon atoms of these groups are substituted with a halogen atom such as fluorine, a hydroxyl group, or an organic group including a methylol group, an epoxy group, a glycidyl group, an acyl group, a carboxyl group, an amino group, a methacrylic group, a mercapto group, an amide group, an oxyalkylene group, etc. The divalent hydrocarbon group is preferably an alkylene group having 1 to 30 carbon atoms, preferably an alkylene group having 1 to 6 carbon atoms, and more preferably an alkylene group having 3 to 5 carbon atoms.

Specific examples of the polyoxyethylene-modified silicone oil include the following.

[ CHEM 2]

(wherein x is 20 to 160, y is 1 to 25, and the value of x/y is 50 to 2,

a is, for example- (CH)₂)₃O-(CH₂CH₂O)m-(CH₂CH₂CH₂O)n-R⁴Wherein m is 7 to 40, n is 0 to 40, m + n is at least 1, and may be obtained by graft polymerization or random polymerization, and R4 represents a hydrogen atom or the above-mentioned substituted or unsubstituted monovalent hydrocarbon group. x is 20 to 160, y is 1 to 25, x/y is 50 to 2, A is for example- (CH)₂)₃O-(CH₂CH₂O)m-(CH₂CH₂CH₂O)n-R⁴Wherein m is 7 to 40, n is 0 to 40, m + n is at least 1, and may be obtained by graft polymerization or random polymerization, and R4 represents a hydrogen atom or the above-mentioned substituted or unsubstituted monovalent hydrocarbon group. Preferably, m is 7 to 30, and n is 0 to 30).

Examples of the modified silicone oil include aminoalkyl-modified silicone oils.

The aminoalkyl-modified silicone oil is a silicone oil in which an aminoalkyl group is bonded to a molecule through a silicon-carbon bond, and is preferably an aminoalkyl-modified silicone oil that exhibits a viscosity of 10 to 100000cs at room temperature, specifically at 25 ℃.

The aminoalkyl silicone oil may be represented by the formula (4): is illustrated by- (NR)⁴CH₂CH₂)_zNR⁴ ₂(in the formula, R⁴Independently as described above, z is a number 0 < z < 4) in the presence of G).

In the present invention, when the foreign matter is silicone, the amount of silicone contained in the interleaving paper for glass sheets is preferably 0.5ppm or less, more preferably 0.4ppm or less, even more preferably 0.3ppm or less, even more preferably 0.2ppm or less, and particularly preferably 0.1ppm or less, based on the dried mass of the interleaving paper. When the amount of silicone exceeds 0.5ppm, the possibility of being judged as poor quality is increased particularly since the portion of broken color film mainly caused by a trace amount of silicone transferred onto glass is highly colored in a place where a very high-definition display is required such as a mobile terminal. In the present invention, "drying" means a state in which substantially no moisture is present in the object to be dried by drying.

The thickness of the interleaving paper for glass sheets of the present invention is preferably 20 to 200. mu.m, more preferably 30 to 150. mu.m, and still more preferably 40 to 200. mu.m. Thus, by making the backing paper relatively thin, the difference in physical state of the front and back sides of the backing paper can be further suppressed.

The weight per unit area of the interleaving paper for glass plate is preferably 20-80 g/m²More preferably 25 to 70g/m²More preferably 30 to 60g/m²。

The interleaving paper for glass sheets of the present invention has an average variation in surface friction coefficient (MMD) of preferably 0.022 or less, preferably 0.020 or less, more preferably 0.019 or less, still more preferably 0.018 or less, and still more preferably 0.017 or less, as obtained by the KES method. A10 mm square friction material composed of a piano wire harness having a diameter of 0.5mm and a paper surface fixed by a tension of 20g/cm were set to 50g/cm using a friction feeling tester (KES-SE manufactured by Katotech corporation)²And moved 2cm in the same direction as the direction in which tension was applied at a sample moving speed of 0.1 cm/sec, the average deviation value of the measured friction coefficient was MMD. When the MMD is large, it means that the friction coefficient of the paper surface greatly varies depending on the position of the paper surface, and microscopically means that the number of minute irregularities on the surfaces of the papers increases. In this way, by providing the fine irregularities on the surface of the interleaving paper, the friction coefficient between the surface of the glass plate and the surface of the interleaving paper is reduced, and the removal work when removing the interleaving paper from the surface of the glass plate becomes easy. When the MMD exceeds 0.022, the minute unevenness on the surfaces of the sheets increases, and the scratch feeling between the sheets increases, which is not preferable. The MMD is preferably 0.001 to 0.022, more preferably 0.002 to 0.020, and further preferably 0.004 to 0.019, for example.

The linered paper for glass sheets of the present invention can be produced based on a conventional method such as a paper-making method.

A second embodiment of the present invention is a method for manufacturing a linered paper for glass sheets, the method comprising:

a pulp preparation step of preparing a pulp of the wood pulp;

a sheet forming step of forming the slurry into a sheet shape;

a wet paper production step of dehydrating the sheet to form a wet paper; and

a drying step of drying the wet paper to obtain the interleaving paper,

in the wet paper making step, dewatering is performed from both sides of the sheet-like slurry.

In the pulp preparation step, a pulp of wood pulp can be prepared by a conventionally known method. For example, in the pulp preparation process, pulp is prepared by macerating cellulose fibers constituting wood pulp into an aqueous suspension.

In addition, a binder, a fungicide, an antifoaming agent, a filler, a wet paper strength agent, a dry paper strength agent, a sizing agent, a colorant, a fixing agent, a synergist, a viscosity control agent, and the like may be added to the slurry as necessary within a range not to impair the performance of the present invention. In addition, it is preferable to add these drugs with careful attention so as not to mix insects, garbage, and the like.

Generally, wood pulp and linerboard contain silicone in most cases. This is because, in the production process of wood pulp and liner paper, particularly in the washing step, a silicone-based defoaming agent is often used as a defoaming agent for preventing the washing performance from being lowered due to the generation of foam, and silicone derived from the silicone-based defoaming agent remains in the pulp and liner paper. For example, a silicone defoaming agent is produced by mixing a modified silicone, a surfactant, and the like with a mixture of a silicone oil and hydrophobic silica.

Talc is an inorganic powder obtained by pulverizing talc, and has a general formula of a layered structure: mg (magnesium)₃(SiO₂)₂(OH)₂Or Mg₃Si₄O₁₀(OH)₂The hydrous magnesium silicate of (1). Talc will be used as a filler, asphalt control agent, coating agent, and the like.

In the second embodiment of the present invention, in order to reduce the content of problematic foreign matters contained in the interleaving paper for glass sheets, it is preferable to use a non-silicone type defoaming agent as the defoaming agent when the defoaming agent is used, and to use a substance other than talc as the filler when the filler is used. More preferably, the wood pulp is obtained by using a wood pulp containing no talc and/or a wood pulp obtained by using a non-silicone defoaming agent.

Examples of the non-silicone defoaming agent include mineral oil defoaming agents, higher alcohol defoaming agents, fatty acid ester defoaming agents, amide defoaming agents, amine defoaming agents, phosphate defoaming agents, metal soap defoaming agents, sulfonate defoaming agents, polyether defoaming agents, and vegetable oil defoaming agents.

The mineral oil type antifoaming agent includes, for example, mineral oil such as hydrocarbon oil, mineral wax, and the like.

Higher alcohol antifoaming agents include, for example, octanol, hexadecanol, and the like.

Fatty acid-based antifoaming agents include, for example, palmitic acid, oleic acid, stearic acid, and the like.

The fatty acid ester-based antifoaming agent includes, for example, isoamyl stearate, glycerol monoricinoleate, sorbitol monolaurate, sorbitol trioleate, and the like.

The amide-based antifoaming agent includes, for example, acrylate polyamine and the like.

Amine defoamers include, for example, diallylamine and the like.

The phosphate ester defoaming agent includes, for example, tributyl phosphate, sodium octyl phosphate and the like.

The metal soap defoaming agent includes, for example, aluminum stearate, calcium stearate, potassium oleate, and the like.

The sulfonate antifoaming agent includes, for example, sodium lauryl sulfonate, sodium dodecyl sulfonate and the like.

The polyether defoaming agent includes, for example, (poly) oxyethylene (poly) oxypropylene adducts and other polyoxyethylenes; (poly) polyoxyethylene alkyl ethers such as diethylene glycol heptyl ether, polyoxyethylene oleyl ether, polyoxypropylene butyl ether, polyoxyethylene polyoxypropylene 2-ethylhexyl ether, and oxyethylene oxypropylene adducts of higher alcohols having 8 or more carbon atoms and glycols having 12 to 14 carbon atoms; (poly) polyoxyethylene (alkyl) aryl ethers such as polyoxypropylene phenyl ether and polyoxyethylene nonylphenyl ether; acetylene ethers obtained by addition polymerization of an alkylene oxide to an acetylene alcohol, such as 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol, 2, 5-dimethyl-3-hexyne-2, 5-diol, and 3-methyl-1-butyn-3-ol; (poly) polyoxyethylene fatty acid esters such as diethylene glycol oleate, diethylene glycol laurate and ethylene glycol distearate; (poly) polyoxyethylene sorbitol fatty acid esters such as polyoxyethylene sorbitol monolaurate and polyoxyethylene sorbitol trioleate; (poly) polyoxyethylene alkyl (aryl) ether sulfate salts such as sodium polyoxypropylene methyl ether sulfate and sodium polyoxyethylene dodecylphenol ether sulfate; (poly) polyoxyethylene alkyl phosphates such as (poly) oxyethylene stearate; (poly) polyoxyethylene alkylamines such as polyoxyethylene lauryl amine; polyoxyethylene amides, and the like.

Vegetable oil antifoaming agents include vegetable oils such as soybean oil, corn oil, coconut oil, linseed oil, rapeseed oil, cottonseed oil, sesame oil, castor oil, and the like.

The non-silicone defoaming agent may contain inorganic particles such as hydrophobic silica. As the hydrophobic silica, it is preferable to use silica subjected to hydrophobic treatment by substituting the silanol group of the hydrophilic silica with an alkyl group such as a methyl group.

The non-silicone defoaming agent may further contain a surfactant and the like as necessary. Thus, the non-silicone type defoaming agent may be of an emulsion type.

As the filler other than talc, an inorganic filler such as kaolin, calcium carbonate, titanium oxide, or barium sulfate, or an organic filler such as a urea resin can be used.

The effect of increasing the inter-ply strength after beating of the wood pulp can be expected in the preparation of the pulp. However, if short fibers are increased by beating, foreign matter may be attracted, and when the paper is used as a liner paper, paper dust may be generated. In the invention, the preferable beating degree is 300-650 mlc.

In the sheet forming step of forming the slurry into a sheet shape, a sheet can be formed by a previously known method. The sheet can be obtained, for example, by ejecting the slurry onto a planar wire (e.g., a fourdrinier machine) or by taking a sheet from the slurry by a wire wound on a cylindrical shaft (e.g., a cylinder machine).

In the second embodiment of the present invention, in the step of preparing a wet paper web by dewatering the sheet, dewatering is performed from both sides of the sheet. Thereby, short fibers having a fiber length of 200 μm or less contained in the sheet are effectively removed from the sheet. The method of dehydration may be arbitrarily selected, and any conventionally known method may be used. There may be cited a method of making paper using a twin wire type paper machine such as a top forming apparatus and a gap former. In addition, in view of adjustment of the press portion, dewatering may be performed by pressing the sheet with a roll, for example. However, in order to effectively remove short fibers, it is preferable to perform the dewatering by suction.

In the step of performing dewatering from both sides of the sheet, for example, the sheet extending in the horizontal direction may be sandwiched between the wires, and the sheet may be subjected to suction dewatering from the vertical direction by a suction device, because a difference occurs between the upward suction force and the downward suction force due to the influence of gravity, and the sheet surface on the side of the upward suction remains more short fibers than the sheet surface on the side of the downward suction force, and therefore, it is preferable to perform suction dewatering in the left-right direction by sandwiching the sheet extending in the vertical direction between the wires. At this time, it is preferable that the moving direction of the wet paper is maintained in a range inclined by 30 ° or less from the vertical direction or the vertical direction.

Preferably, the difference between the suction dewatering ratio of one surface of the sheet and the suction dewatering ratio of the other surface is 10% or less of the suction dewatering ratio of the other surface. That is, in the method for producing a interleaving paper for glass sheets of the present invention, it is preferable that suction is performed from both sides of the sheet with substantially the same suction force.

The sheet forming step and the wet paper making step may be performed separately using separate apparatuses, or may be performed continuously or partially repeatedly in the same apparatus. For example, it is also possible to make a sheet by placing a slurry on a wire (wire) in a wire part of a paper machine and performing dewatering to form a wet paper.

In the drying process, the linered paper may be obtained by drying wet paper by a conventionally known method using a dryer roll or the like.

In order to further remove short fibers having a fiber length of 200 μm or less which can remain on the surface of the interleaving paper, the method for producing a glass sheet interleaving paper of the present invention preferably includes an additional suction step of further sucking both surfaces of the interleaving paper after the drying step.

Further, the glass sheet interleaving paper may be subjected to a processing such as calendering, supercalendering, flexible nip calendering, and embossing during and/or after the paper-making process. The surface properties and thickness can be adjusted by machining.

The interleaving paper for glass sheets according to the first embodiment of the present invention can be efficiently produced by the production method according to the second embodiment of the present invention.

The glass sheet-lining paper of the present invention is used by being inserted between glass sheets. For example, typically, a single sheet of the liner paper for glass sheets is inserted between a plurality of glass sheets, and these sheets are integrated into a laminate to be stored and transported. Further, the glass sheet single body or the laminate may be packaged using the interleaving paper for glass sheets of the present invention. Accordingly, the present invention provides an embodiment of a method for protecting a glass sheet, which comprises a step of disposing (particularly, inserting) the above-described interleaving paper for a glass sheet between glass sheets.

The glass plate is not particularly limited, and is preferably a glass plate for flat panel display such as a plasma display panel, a liquid crystal display panel (particularly, a TFT liquid crystal display panel), or an organic EL display panel. The use of the spacer paper for glass sheets of the present invention suppresses or even prevents the transfer of problematic fine foreign matters onto the glass sheets, and thus even if the fine electrodes, the partition walls, and the like are formed on the surface of the glass sheets, adverse effects caused by the foreign matters can be suppressed or even avoided, and as a result, defects of the display can be suppressed or even avoided.

In particular, as the size and weight of a flat panel/glass plate for a display are increased with the increase in the size of the display, the interleaving paper for a glass plate of the present invention can protect the surface of such a large-sized glass plate or even a heavy-sized glass plate well. In particular, since the backing paper for glass sheets of the present invention contains extremely small amounts of fine foreign matter, particularly hydrophobic foreign matter such as silicone, asphalt, resin, rubber, oil (excluding silicone) and talc having adsorbed hydrophobic foreign matter, even when pressed against a heavy glass sheet, the transfer of the foreign matter to the glass sheet can be suppressed or avoided. Therefore, the interleaving paper for glass sheets of the present invention can be preferably used for glass sheets for flat panel/display, which particularly require surface cleanliness.

Examples

The present invention will be specifically described below with reference to examples and comparative examples, but the scope of the present invention is not limited to the examples.

[ measurement of short fiber content ]

The method of measuring the Fiber length by the optical automatic analysis method defined in JISP8226 (2006) uses a Kajaani Fiber length measuring instrument "Metso Fiber image analyzer FS 5" (manufactured by Metso Automation).

[ Presence amount of short fibers in the paper surface ]

The glass plate was cut into 20cm × 20cm with a liner paper, and only one side of the paper was sufficiently washed with demetallized ionized water to cause the short fibers to fall off. The washed liquid was recovered, and the Fiber length of each Fiber in the liquid was measured by the Kajaani Fiber length measuring apparatus "Metso Fiber image analyzer FS 5". The number of fibers having a fiber length of 200 μm or less is calculated to determine the proportion of the short fibers per unit area.

[ test method for transfer onto glass plate (transportation test) ]

A glass-plate-use backing paper is inserted between 120 glass plates of 680mm by 880mm by 0.7mm in size and each glass plate, and a belt-like tape set parallel to the back surface and fixed to a stand is hung from the rear end part to the back surface in a single turn to fix the glass plates. In order to prevent dust, fine dust, and the like from entering from the outside, the entire surface of the stage provided in the above-described manner is covered with packaging resources. Then, the transportation test was performed by truck. The test was carried out under the transport test conditions of a transport distance of 1000km (5 days of storage in an environment of 40 ℃ C.. times.95% RH during transport).

[ example 1]

100 parts by mass of bleached softwood kraft pulp is prepared and is macerated to obtain a pulp with a beating degree of 550 mlc.s.f.. 0.2 part by mass of polyacrylamide (trade name: Polystrone1250, manufactured by Mitsuwa chemical industries, Ltd.) was added as a paper strength agent to the total pulp mass, and the pulp slurry was adjusted to a concentration of 0.4% by mass. The pulp slurry was made into paper using a fourdrinier paper machine with a top forming device in the wire section, obtaining a mass per unit area of 55g/m²The glass sheet of (1) is a backing paper. In the wire part, a 76-mesh plain-weave plastic wire was used, and the difference in the dewatering ratio between the top forming devices on both sides of the wet paper was adjusted to 7% or more and 10% or less (based on the dewatering ratio of the top forming device on the upper side).

[ example 2]

A mass per unit area of 55g/m was obtained in the same manner as in example 1, except that the difference in the dewatering ratio between the top forming devices on both sides of the wet paper sheet was adjusted to 5% or less (based on the dewatering ratio of the top forming device on the upper side)²The glass sheet of (1) is a backing paper.

Comparative example 1

A mass per unit area of 55g/m was obtained in the same manner as in example 1, except that no top molding apparatus was used²The glass sheet of (1) is a backing paper.

Table 1 shows the measurement results of the interleaving papers for glass sheets of examples and comparative examples. In addition, it was confirmed by a transportation test that the interleaving paper for glass plates obtained in examples and comparative examples was transferred onto a glass plate, and as a result, color film breakage was not observed when an array of liquid crystal panels was formed using the glass plate using the interleaving paper of examples. On the other hand, when an array of liquid crystal panels was formed using a glass plate using the interleaving paper for glass plates of comparative example 1, color film disconnection was observed.

TABLE 1

The relative front and back is (amount of existence of surface-amount of existence of back)/amount of existence of back

Claims

1. A liner paper for glass plate, which is made of wood pulp,

wherein the content of short fibers having a fiber length of 200 μm or less is 10.5% by mass or less,

the difference between the amount of short fibers present on one surface and the amount of short fibers present on the other surface is 15% or less of the amount of short fibers present on the other surface,

the amount present is:

(1) the glass plate was cut into 20cm x 20cm using a liner paper,

(2) only one surface of the sheared 20cm x 20cm paper is fully cleaned by demetallization ionized water to lead short fibers to fall off,

(3) recovering the washed demetallized ion water, measuring the fiber length of each fiber in the washed demetallized ion water using a Kajaani fiber length measuring apparatus, and

(4) the number of fiber lengths of 200 μm or less is calculated to determine the proportion of the short fibers per unit area, thereby determining the backing paper for glass sheets.

2. The linered paper for glass sheets according to claim 1, wherein the content of the short fiber is 1.2% by mass or more.

3. The linered paper for glass sheets according to claim 1 or 2, wherein the short fibers have an average fiber diameter of 10 to 50 μm.

4. The linered paper for glass sheets as claimed in claim 1 or 2, wherein the short fibers are present on the surface in an amount of 300 to 850 pieces/m²。

5. The interleaving paper for glass sheets as claimed in claim 1 or 2, which has a thickness of 20 to 200 μm.

6. The interleaving paper for glass sheets as claimed in claim 1 or 2, wherein the average deviation of friction coefficient (MMD) of the surface obtained by the KES method is 0.022 or less.

7. The interleaving paper for glass sheets as claimed in claim 1 or 2, wherein said glass sheet is a glass sheet for display.

8. The interleaving paper for glass sheets as claimed in claim 7, wherein said display is a TFT liquid crystal display or an organic EL display.

9. A laminate comprising the interleaving paper for glass sheets as claimed in any one of claims 1 to 8 and a glass sheet.

10. A method for protecting a glass sheet, comprising the step of disposing the interleaving paper for glass sheets as claimed in any one of claims 1 to 8 between glass sheets.

11. A method for producing a linered paper for glass sheets, the linered paper for glass sheets according to any one of claims 1 to 8, comprising:

a pulp preparation step of preparing a pulp of the wood pulp;

a sheet forming step of forming the slurry into a sheet shape;

a wet paper production step of dehydrating the sheet to form a wet paper; and

a drying step of drying the wet paper to obtain the interleaving paper,

12. The manufacturing method according to claim 11, the dehydration is performed by suction.

13. The manufacturing method according to claim 12, a difference between the suction dehydration proportion of one surface of the sheet and the suction dehydration proportion of the other surface is 10% or less of the suction dehydration proportion of the other surface.

14. The manufacturing method according to claim 12 or 13, comprising an additional suction step of further sucking both sides of the liner paper after the drying step.