WO2020045380A1 - Interleaving paper for glass and production method therefor - Google Patents

Interleaving paper for glass and production method therefor Download PDF

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Publication number
WO2020045380A1
WO2020045380A1 PCT/JP2019/033410 JP2019033410W WO2020045380A1 WO 2020045380 A1 WO2020045380 A1 WO 2020045380A1 JP 2019033410 W JP2019033410 W JP 2019033410W WO 2020045380 A1 WO2020045380 A1 WO 2020045380A1
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Prior art keywords
glass
sodium
pulp
paper
interleaving paper
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PCT/JP2019/033410
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French (fr)
Japanese (ja)
Inventor
萩原　浩一
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王子ホールディングス株式会社
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Application filed by 王子ホールディングス株式会社 filed Critical 王子ホールディングス株式会社
Priority to EP19855412.3A priority Critical patent/EP3845705B1/en
Priority to CN201980055178.7A priority patent/CN112601861B/en
Publication of WO2020045380A1 publication Critical patent/WO2020045380A1/en

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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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • 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
    • 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
    • D21H17/66—Salts, e.g. alums
    • 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
    • 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

Definitions

  • the present invention relates to a glass slip sheet inserted between glass plates and a method for producing the same.
  • a fine electronic member or the like is formed on the surface of the glass substrate. It causes defects and causes product defects. Therefore, the glass substrate surface is required to have a high degree of clarity.
  • Glass substrates are often stacked and transported for the purpose of increasing transport efficiency as glass substrates become larger and mass-produced.
  • the contact pressure between the glass interleaf and the glass substrate increases, so that the probability that a trace component, a foreign matter, or the like in the glass interleaf acts on the glass substrate to contaminate it or cause a problem is increased.
  • higher clarity is required on the surface of the glass substrate. Under these circumstances, the quality requirements for glass slip sheets are becoming increasingly sophisticated.
  • Patent Document 1 discloses a glass sheet interleaf paper containing zeolite as a glass sheet interleaf paper which suppresses the occurrence of burns on the glass sheet, does not cause water repellency of the glass sheet, and does not cause adhesion of paper marks. I have.
  • Patent Literature 1 the method of blending zeolite described in Patent Literature 1 did not always have a sufficient effect against burns.
  • an object of the present invention is to provide a glass insert paper capable of reducing the occurrence of burns on a glass plate and a method for producing the same.
  • the present inventor has investigated the effect of metal ions on the occurrence of burns in order to solve the above-mentioned problems, and found that glass insert paper having a relatively high sodium content reduces the occurrence of burns, and hardwood pulp. It has been found that in the case where pulp is blended, there is a tendency that burns are less likely to occur as compared with the case where no hardwood pulp is blended.
  • the present invention has been made based on such knowledge. That is, the present invention has the following configuration.
  • Glass interleaving paper containing a chemical pulp as a main component, a sodium content of 0.03 to 1.0% by mass, and a basis weight of 10 to 300 g / m 2 , which occupy the chemical pulp.
  • Glass interleaf paper having a hardwood pulp ratio of 10% by mass or more.
  • a method for producing glass interleaving paper comprising:
  • the glass interleaving paper of the present invention it is possible to reduce the occurrence of burns on the glass plate. Further, according to the method for manufacturing a glass interleaf of the present invention, the glass interleaf can be manufactured.
  • the glass interleaving paper of this embodiment contains chemical pulp as a main component and contains sodium.
  • chemical pulp as a main component
  • sodium contains sodium.
  • the glass interleaving paper of the present embodiment contains chemical pulp as a main component.
  • the chemical pulp is the main component means that the chemical pulp exceeds 50% by mass with respect to the mass of the slip sheet.
  • the chemical pulp is preferably at least 70% by mass, more preferably at least 90% by mass, based on the mass of the paper.
  • Chemical pulp is cellulose pulp produced through a chemical process, and examples thereof include kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP).
  • Chemical pulp made from wood includes softwood pulp and hardwood pulp.
  • the present inventors have found that when hardwood pulp is blended as chemical pulp, burns tend to be less likely to occur than when hardwood pulp is not blended. The following is considered as a reason why burn is unlikely to occur when hardwood pulp is blended.
  • When storing glass sheets and interleaving paper in layers if the interleaving paper absorbs moisture and expands due to the effects of high humidity, such as in the summer, wrinkles are formed, and a gap is created between the glass sheet and the interleaving paper. Humid air comes into direct contact with the glass plate. High humidity air tends to cause burns as described below.
  • the ratio of hardwood pulp to chemical pulp is set to 10% by mass or more in order to reduce the amount of burns.
  • the proportion of hardwood pulp in the chemical pulp is preferably at least 40% by mass, more preferably at least 70% by mass.
  • wood pulp kraft pulp (KP) having a low content of sticky natural resin derived from wood is preferable.
  • chemical pulp that does not use wood as a raw material include non-wood fiber pulp that uses raw materials such as mulberry, mitsumata, hemp, and kenaf.
  • semi-chemical pulp such as semi-chemical pulp (SCP) and chemi-grand wood pulp (CGP); groundwood pulp (GP), thermo-mechanical pulp (TMP, BCTMP), refiner ground wood pulp (RGP) And other mechanical pulp.
  • SCP semi-chemical pulp
  • CGP chemi-grand wood pulp
  • GP groundwood pulp
  • TMP thermo-mechanical pulp
  • RGP refiner ground wood pulp
  • the glass interleaving paper of the present embodiment may be one in which pulp other than chemical pulp is used alone or in combination of two or more.
  • Virgin pulp is more preferable as waste paper pulp than waste paper pulp because waste paper pulp generally has a large amount of sticky foreign matters, impurities, and resins.
  • the degree of beating of the chemical pulp is preferably from 200 to 700 mlcsf.
  • the degree of beating refers to Canadian standard freeness according to JIS P8121.
  • the degree of beating of the chemical pulp is less than 200 mlcsf, the density of the interleaf paper tends to be high and the cushioning property tends to be low, so that the glass surface may be easily scratched.
  • the degree of beating of the chemical pulp is higher than 700 mlcsf, the paper strength becomes weak, and there is a possibility that the pulp may be broken in the distribution process or the manufacturing process. More preferably, the degree of beating of the chemical pulp is from 350 to 600 mlcsf. A known method can be used for beating the pulp.
  • Glass plate burns Conventionally, the following two mechanisms have been considered as a mechanism for causing burns on a glass plate. That is, when water droplets adhere to the surface of the glass plate, a small amount of sodium ions in the glass dissolve into water, sodium hydroxide is generated on the surface of the glass plate, the surface of the glass plate is eroded and roughened, and the glass plate becomes cloudy. . In addition, when water droplets on the surface of the glass plate evaporate, sodium ions react with carbon dioxide in the air to produce sodium carbonate or sodium bicarbonate, which adheres to the surface of the glass plate and makes the glass plate cloudy. .
  • the present inventor has found that when the interleaving paper contains a predetermined amount of sodium, the above-mentioned minute burns are less likely to occur. That is, the interleaving paper of the present embodiment has a sodium content of 0.03 to 1.0% by mass. When the content of sodium is 0.03% by mass or more, the amount of burns can be reduced. On the other hand, when the content of sodium exceeds 1.0% by mass, there is a concern that a salt of sodium precipitates in the slip sheet and contaminates the glass plate.
  • the content of sodium in the slip sheet is more preferably 0.05 to 0.5% by mass, and still more preferably 0.1 to 0.3% by mass.
  • the sodium content in the slip sheet can be specified by measuring the ash content of the slip sheet and further measuring the sodium content in the ash content by X-ray fluorescence analysis.
  • Soda glass plate is usually used as a glass substrate for touch panels.
  • the soda glass plate has a protective film made of sulfate on the surface of the glass plate for preventing flaws.
  • the protective film for preventing flaws is formed by spraying a sulfurous acid gas on the surface of the glass plate during the production of the glass plate to react the sodium in the glass plate with the sulfurous acid gas to generate sodium sulfate on the surface of the glass plate. .
  • sodium in the glass plate bleeds (moves) near the surface, so that the surface region near the surface of the glass plate is in a state where the amount of sodium is deficient. This is presumed to cause slight burns.
  • the content of sodium in the slip sheet when the content of sodium in the slip sheet is large, it has an effect of suppressing bleeding (migration) of sodium ions in the glass plate to the slip sheet. Further, it also has an effect that sodium ions in the slip sheet move to a sodium-deficient portion near the surface of the glass plate through a flaw preventing protective film made of sodium sulfate. As a result, the amount of sodium ions present in the glass plate is stabilized, and the ion exchange reaction between hydrogen ions and sodium ions of water vapor in the slip sheet or air is suppressed. This is presumed to reduce the occurrence of burns without increasing the amount of hydrogen ions present in the glass plate.
  • sodium-containing water is used in at least one of the chemical pulp production process and the papermaking process.
  • first method a method of adding a compound containing sodium in at least one of a chemical pulp manufacturing step, a paper making step, and a step after paper making
  • the sodium content in the finally obtained interleaf paper is adjusted by appropriately controlling the sodium content in the water used in at least one of the chemical pulp manufacturing process and the papermaking process. can do.
  • Sodium is a component generally contained in water. So-called soft water has a relatively low sodium content, and hard water contains a relatively large amount of sodium.
  • the hardness of the water containing sodium is preferably from 70 to 500 (mg / l), more preferably from 120 to 400 (mg / l).
  • the electric conductivity of water is preferably from 14 to 100 mS / m, more preferably from 24 to 33 mS / m.
  • the water containing sodium may be used in both the chemical pulp manufacturing process and the papermaking process, or may be used in either one of the processes. If sodium is dissolved in the water used in the chemical pulp manufacturing process or papermaking process, the chemical pulp may retain sodium inside because the carboxy groups contained therein form salts with metal ions. it can. In addition, since paper is produced by drying wet paper, it can hold a certain amount of sodium in water.
  • a method of adding a compound containing sodium to a raw material in at least one of a chemical pulp production step and a paper making step (internal addition method), and at least one of a chemical pulp production step and a paper making step
  • a method using water in which a sodium-containing compound is dissolved and dispersed in two steps (water use method)
  • a method in which an aqueous solution in which a sodium-containing compound is dissolved and dispersed in a post-papermaking step is applied to the surface of an interleaf paper Coating method.
  • a coating method capable of containing sodium more efficiently is preferable.
  • the sodium-containing compound is preferably sodium sulfate (Glauber's salt, Na 2 SO 4 ). Sodium sulfate may be used as a raw material for glass.
  • the occurrence of burns on the glass plate can be reduced by defining the ratio of the hardwood pulp in the chemical pulp and the content of sodium in the slip sheet.
  • papermaking chemicals can be used for the papermaking chemicals used in the papermaking of the slip sheet, as long as they do not contaminate the glass surface.
  • papermaking chemicals include paper strength enhancers such as polyacrylamide, water-resistant agents such as polyamide polyamine epichlorohydrin, softeners, antistatic agents, defoamers, slime control agents, fillers, dyes, and the like. Since all of these papermaking chemicals have a risk of contaminating the glass plate, the total amount is preferably 0.1% by mass or less even when added.
  • the slip sheet can be formed by using various paper machines and selecting appropriate forming conditions.
  • Specific examples of the paper machine include a fourdrinier former, a twin-wire former, a circular net former, and an inclined former.
  • the layer structure of the slip sheet may be a single layer or a multilayer.
  • the above-described first method or second method can be used as a method for controlling the content of sodium in the slip sheet to 0.03 to 1.0% by mass.
  • the basis weight of the interleaving paper is small because the mass during transportation is small. However, if the basis weight is too small, it is not possible to impart a sufficient cushioning property to the glass plate. On the other hand, it is preferable that the basis weight of the interleaving paper is large to some extent in terms of the buffering property. In consideration of the balance between the buffering property and the ease of transport and the application, the basis weight of the slip sheet is 10 to 300 g / m 2 . The more preferable basis weight of the slip sheet is 30 to 80 g / m 2 .
  • the thickness of the slip sheet is preferably from 25 to 250 ⁇ m from the viewpoint of cushioning and workability.
  • the density of the slip sheet is preferably 0.4 to 1.2 g / cm 3 .
  • the pH of the slip paper (JIS P 8133-2) is preferably neutral.
  • the slip sheet of the present embodiment is used to protect a glass substrate when storing and transporting a plurality of glass substrates for a flat panel display such as a glass substrate for a touch panel, a liquid crystal display, an organic electroluminescence display, and a plasma display. It is preferably used.
  • the numerical value which shows a compounding is a numerical value (mass%) of the solid content or the mass basis of an active ingredient.
  • the paper was processed according to JIS P8111 and then subjected to measurement and evaluation tests.
  • Example 1-4 Materials used in Examples and Comparative Examples are as follows.
  • NKP Softwood bleached kraft pulp
  • Sodium sulfate Tosoh Corporation, anhydrous neutral sodium sulfate
  • Example 1 As a raw material pulp, a virgin pulp slurry (with a beating degree of 450 mlcsf) containing 80% of commercially available LBKP (hardwood bleached kraft pulp) and 20% of commercially available NBKP (softwood bleached kraft pulp) is used, and water having an electrical conductivity of 25 mS / m is used.
  • the paper was made with a Fourdrinier without adding papermaking chemicals. After papermaking, the paper was dried to obtain a glass interleaving paper having a basis weight of 40 g / m 2 .
  • the sodium content of the obtained glass interleaving paper was 0.05%.
  • Example 2 Glass insert paper in the same manner as in Example 1 except that water having an electric conductivity of 3 mS / m was used and a sodium sulfate solution was applied by a size press so that the amount of sodium sulfate added to the insert paper was 0.3%. I got The sodium content of the obtained glass interleaving paper was 0.10%.
  • Example 3 A glass interleaf was obtained in the same manner as in Example 2, except that the amount of sodium sulfate added to the interleaf was 0.5%. The sodium content of the obtained glass interleaving paper was 0.18%.
  • Example 4 Glass insert paper was prepared in the same manner as in Example 3 except that virgin pulp slurry (beating degree: 450 mlcsf) of 40% of commercial LBKP (hardwood bleached kraft pulp) and 60% of commercial NBKP (softwood bleached kraft pulp) was used as the raw material pulp. Obtained. The sodium content of the obtained glass interleaving paper was 0.18%.
  • Example 1 A glass interleaf was obtained in the same manner as in Example 2 except that sodium sulfate was not added.
  • the sodium content of the obtained glass interleaving paper was 0.01%.
  • Example 2 A glass interleaf was obtained in the same manner as in Example 3 except that a 100% virgin pulp slurry (with a beating degree of 450 mlcsf) of 100% commercial NBKP (softwood bleached kraft pulp) was used as the raw material pulp.
  • the sodium content of the obtained glass interleaving paper was 0.18%.
  • m sodium content (% by mass)
  • a Ash content of glass interleaf paper (% by mass)
  • b sodium content in ash (% by mass)
  • a glass plate for a touch panel of 200 mm ⁇ 200 mm is placed on a 210 mm ⁇ 210 mm glass interleaving paper, three sets of the combinations are alternately laminated, and a 1 kg weight is placed thereon to apply pressure, and a temperature of 50 ° C. and a humidity of 90% RH is applied.
  • the scoring of the glass plate was evaluated according to the following criteria. A was determined to be acceptable. A: no fogging B: some fogging C: fogging
  • Table 1 shows the evaluation results of Examples 1 to 4 and Comparative Examples 1 and 2.
  • the glass slip sheets of Examples 1 to 4 were excellent in scorching of the glass plate.
  • the glass sheets of Comparative Examples 1 and 2 were inferior in the burnt of the glass plate.

Abstract

The purpose of the present invention is to provide: interleaving paper for glass capable of reducing the occurrence of glass plate tarnishing; and a production method therefor. Provided is interleaving paper for glass, which has chemical pulp as the main component, in which sodium content is 0.03–1.0 mass%, and the basis weight of which is 10–300 g/m2, wherein the proportion of hardwood pulp in the chemical pulp is at least 10 mass%. Also provided is a production method for said interleaving paper for glass characterized in that sodium-containing water is used in the chemical pulp production step and/or the papermaking step. Also provided is a production method for said interleaving paper for glass characterized in that a sodium-containing compound is added in at least one of the chemical pulp production step, papermaking step, and post-papermaking step.

Description

ガラス合紙およびその製造方法Glass interleaf and its manufacturing method
　本発明は、ガラス板同士の間に挿入するガラス合紙とその製造方法に関する。 The present invention relates to a glass slip sheet inserted between glass plates and a method for producing the same.
　近年、ガラス板の多用途化により、ガラス合紙に対する品質要求が厳しくなっている。例えば、液晶ディスプレイ、タッチパネル等のフラットパネルディスプレイに用いられるガラス基板では、ガラス基板表面に対して微細な電子部材等が形成されるため、表面に僅かな傷や汚染があった場合、断線等の不良の原因となり、製品欠陥となる。そのため、ガラス基板表面には高度の清澄性が求められる。 In recent years, due to the versatility of glass plates, quality requirements for glass interleaving paper have become strict. For example, in a glass substrate used for a flat panel display such as a liquid crystal display and a touch panel, a fine electronic member or the like is formed on the surface of the glass substrate. It causes defects and causes product defects. Therefore, the glass substrate surface is required to have a high degree of clarity.
　ガラス基板の大型化・量産化に伴い、搬送効率を高める目的で、ガラス基板を重ねて搬送する場合が多い。ガラス基板を重ねると、ガラス合紙とガラス基板との接触圧力が高まるので、ガラス合紙中の微量成分、異物等がガラス基板に作用して汚染する、または、不具合を与える確率が高まる。その一方で、ガラス基板への高精細な加工に伴い、ガラス基板表面にはより高度な清澄性が要求されている。このような事情により、ガラス合紙に対する品質要求水準は益々高度化しつつある。 伴 い Glass substrates are often stacked and transported for the purpose of increasing transport efficiency as glass substrates become larger and mass-produced. When the glass substrates are stacked, the contact pressure between the glass interleaf and the glass substrate increases, so that the probability that a trace component, a foreign matter, or the like in the glass interleaf acts on the glass substrate to contaminate it or cause a problem is increased. On the other hand, with the high-definition processing of a glass substrate, higher clarity is required on the surface of the glass substrate. Under these circumstances, the quality requirements for glass slip sheets are becoming increasingly sophisticated.
　ガラス基板表面の汚染にはいくつかの原因が考えられる。タッチパネル用のガラス基板で使用されるソーダガラスでは、ガラス合紙とガラス基板表面の接触期間が長くなると、ガラス基板表面に紙肌模様やヤケが生じ易いという問題がある。ヤケとは、ガラス基板中のナトリウムイオン等の可溶性成分と水等に由来する水素イオンとがイオン交換反応し、ガラス基板表面が侵食されて荒らされたり、溶出成分と空気中の二酸化炭素などの酸性ガスとが反応して反応生成物が析出したりすること等により、表面が白く曇って見える現象である。 汚染 There are several possible causes for contamination of the glass substrate surface. In soda glass used for a glass substrate for a touch panel, there is a problem that if the contact period between the glass interleaf paper and the surface of the glass substrate is prolonged, a paper texture or scorch is likely to occur on the glass substrate surface. Burning is an ion-exchange reaction between soluble components such as sodium ions in the glass substrate and hydrogen ions derived from water, etc., and the surface of the glass substrate is eroded and roughened. This is a phenomenon in which the surface appears white and cloudy due to, for example, a reaction product being precipitated by reaction with an acidic gas.
　このようなガラス基板表面のヤケを防止するために、種々の方法が提案されている。例えば、特許文献１には、ガラス板のヤケの発生を抑え、かつガラス板の撥水性化および紙跡付着が起こらないガラス板用合紙として、ゼオライトを含むガラス板用合紙が開示されている。 種 々 Various methods have been proposed to prevent such scorching of the glass substrate surface. For example, Patent Document 1 discloses a glass sheet interleaf paper containing zeolite as a glass sheet interleaf paper which suppresses the occurrence of burns on the glass sheet, does not cause water repellency of the glass sheet, and does not cause adhesion of paper marks. I have.
特開平７－４１０３４号公報JP-A-7-41034
　しかし、特許文献１に記載のゼオライトを配合する方法では、ヤケに対する効果が必ずしも十分なものではなかった。 However, the method of blending zeolite described in Patent Literature 1 did not always have a sufficient effect against burns.
　本発明は、上記のような状況に鑑みてなされたものである。すなわち、本発明の課題は、ガラス板のヤケの発生を低減させることが可能なガラス合紙とその製造方法を提供することである。 The present invention has been made in view of the above situation. That is, an object of the present invention is to provide a glass insert paper capable of reducing the occurrence of burns on a glass plate and a method for producing the same.
　本発明者は、上記課題を解消するために、ヤケの発生における金属イオンの影響について検討を加えたところ、ナトリウムの含有量が比較的多いガラス合紙はヤケの発生が少なくなること、広葉樹パルプを配合した場合には、広葉樹パルプを配合しない場合と比べてヤケが発生しにくい傾向があるということを見出した。本発明は、このような知見を基に生まれたものである。すなわち、本発明は以下のような構成を有している。 The present inventor has investigated the effect of metal ions on the occurrence of burns in order to solve the above-mentioned problems, and found that glass insert paper having a relatively high sodium content reduces the occurrence of burns, and hardwood pulp. It has been found that in the case where pulp is blended, there is a tendency that burns are less likely to occur as compared with the case where no hardwood pulp is blended. The present invention has been made based on such knowledge. That is, the present invention has the following configuration.
（１）化学パルプを主成分とし、ナトリウムの含有量が０．０３～１．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙であって、前記化学パルプに占める広葉樹パルプの割合が１０質量％以上であるガラス合紙。 (1) Glass interleaving paper containing a chemical pulp as a main component, a sodium content of 0.03 to 1.0% by mass, and a basis weight of 10 to 300 g / m 2 , which occupy the chemical pulp. Glass interleaf paper having a hardwood pulp ratio of 10% by mass or more.
（２）前記（１）に記載のガラス合紙を製造する方法であって、前記化学パルプの製造工程および抄紙工程の少なくとも１つの工程で、ナトリウムを含有する水を使用することを特徴とするガラス合紙の製造方法。 (2) The method for producing a glass slip paper according to the above (1), wherein sodium-containing water is used in at least one of the chemical pulp production step and the paper making step. A method for manufacturing glass slip paper.
（３）前記（１）に記載のガラス合紙を製造する方法であって、前記化学パルプの製造工程、抄紙工程および抄紙後の工程の少なくとも１つの工程で、ナトリウムを含有する化合物を添加することを特徴とするガラス合紙の製造方法。 (3) The method for producing a glass interleaving paper according to the above (1), wherein a compound containing sodium is added in at least one of the chemical pulp production process, the papermaking process, and the process after the papermaking process. A method for producing glass interleaving paper, comprising:
（４）前記ナトリウムを含有する化合物が硫酸ナトリウムであることを特徴とする前記（３）に記載のガラス合紙の製造方法。 (4) The method for producing a glass slip sheet according to (3), wherein the compound containing sodium is sodium sulfate.
　本発明のガラス合紙によれば、ガラス板のヤケの発生を低減させることができる。また、本発明のガラス合紙の製造方法によれば、前記ガラス合紙を製造することができる。 According to the glass interleaving paper of the present invention, it is possible to reduce the occurrence of burns on the glass plate. Further, according to the method for manufacturing a glass interleaf of the present invention, the glass interleaf can be manufactured.
　以下、本発明を具体的に説明する。以下に示す実施形態は一例であり、本発明はこれらの実施形態に限定して解釈されるものではない。 Hereinafter, the present invention will be specifically described. The embodiments described below are examples, and the present invention is not construed as being limited to these embodiments.
　本実施形態のガラス合紙は、化学パルプを主成分とし、ナトリウムを含有する。以下、各成分について説明する。 ガ ラ ス The glass interleaving paper of this embodiment contains chemical pulp as a main component and contains sodium. Hereinafter, each component will be described.
（化学パルプ）
　本実施形態のガラス合紙（以下、適宜「合紙」とも記載する。）は、化学パルプを主成分とする。ここで、化学パルプを主成分とするとは、合紙の質量に対して、化学パルプが５０質量％を超えることを意味する。化学パルプは、合紙の質量に対して、７０質量％以上が好ましく、９０質量％以上がより好ましい。化学パルプとは化学的なプロセスを経て製造されたセルロースパルプのことであり、例えば、クラフトパルプ（ＫＰ）、サルファイトパルプ（ＳＰ）、ソーダパルプ（ＡＰ）等が挙げられる。 (Chemical pulp)
The glass interleaving paper of the present embodiment (hereinafter, also appropriately referred to as “interleaving paper”) contains chemical pulp as a main component. Here, that the chemical pulp is the main component means that the chemical pulp exceeds 50% by mass with respect to the mass of the slip sheet. The chemical pulp is preferably at least 70% by mass, more preferably at least 90% by mass, based on the mass of the paper. Chemical pulp is cellulose pulp produced through a chemical process, and examples thereof include kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP).
　木材を原料とする化学パルプ（木材パルプ）には、針葉樹パルプと広葉樹パルプとがある。本発明者は、化学パルプとして広葉樹パルプを配合した場合には、広葉樹パルプを配合しない場合と比べてヤケが発生しにくい傾向があることを見出した。広葉樹パルプを配合した場合にヤケが発生しにくい理由として、以下のように考えている。ガラス板と合紙とを積層して保管する場合、夏場などの高湿度環境の影響で合紙が吸湿して伸びると、シワができ、ガラス板と合紙との間に隙間が生じ、高湿度の空気がガラス板に直接接触することとなる。高湿度の空気は後記するヤケを発生させ易い。そのため、吸湿してもシワの発生がほとんどない紙にすればヤケの発生を抑えることができる。広葉樹パルプは針葉樹パルプと比べて繊維長が短いため、広葉樹パルプの配合量を多くすると、紙の地合が良くなり、吸湿によるシワの発生を抑制でき、ガラス板と合紙との間の隙間の発生を防いで、ヤケの発生量を少なくすることができる。 化学 Chemical pulp made from wood (wood pulp) includes softwood pulp and hardwood pulp. The present inventors have found that when hardwood pulp is blended as chemical pulp, burns tend to be less likely to occur than when hardwood pulp is not blended. The following is considered as a reason why burn is unlikely to occur when hardwood pulp is blended. When storing glass sheets and interleaving paper in layers, if the interleaving paper absorbs moisture and expands due to the effects of high humidity, such as in the summer, wrinkles are formed, and a gap is created between the glass sheet and the interleaving paper. Humid air comes into direct contact with the glass plate. High humidity air tends to cause burns as described below. Therefore, if paper is used that hardly generates wrinkles even when it absorbs moisture, it is possible to suppress the occurrence of scorching. Since hardwood pulp has a shorter fiber length than softwood pulp, increasing the blending amount of hardwood pulp improves the paper formation, suppresses the generation of wrinkles due to moisture absorption, and reduces the gap between the glass plate and the slip paper. The occurrence of burns can be prevented, and the amount of burns can be reduced.
　すなわち、本実施形態の合紙は、ヤケの発生量を少なくするため、化学パルプに占める広葉樹パルプの割合を１０質量％以上とする。化学パルプに占める広葉樹パルプの割合は、４０質量％以上が好ましく、７０質量％以上がより好ましい。 That is, in the interleaf paper of this embodiment, the ratio of hardwood pulp to chemical pulp is set to 10% by mass or more in order to reduce the amount of burns. The proportion of hardwood pulp in the chemical pulp is preferably at least 40% by mass, more preferably at least 70% by mass.
　さらに、木材パルプとしては、木材由来の粘着性天然樹脂分の含有量が低いクラフトパルプ（ＫＰ）が好適である。また、木材を原料としない化学パルプとしては、例えば、楮、三椏、麻、ケナフ等を原料とする非木材繊維パルプが挙げられる。 Further, as the wood pulp, kraft pulp (KP) having a low content of sticky natural resin derived from wood is preferable. Examples of the chemical pulp that does not use wood as a raw material include non-wood fiber pulp that uses raw materials such as mulberry, mitsumata, hemp, and kenaf.
　化学パルプ以外のパルプとしては、セミケミカルパルプ（ＳＣＰ）、ケミグランドウッドパルプ（ＣＧＰ）等の半化学パルプ；砕木パルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ、ＢＣＴＭＰ）、リファイナーグランドウッドパルプ（ＲＧＰ）等の機械パルプが挙げられる。本実施形態のガラス合紙は、化学パルプ以外のパルプを１種または２種以上混合したものでもよい。 As pulp other than chemical pulp, semi-chemical pulp such as semi-chemical pulp (SCP) and chemi-grand wood pulp (CGP); groundwood pulp (GP), thermo-mechanical pulp (TMP, BCTMP), refiner ground wood pulp (RGP) And other mechanical pulp. The glass interleaving paper of the present embodiment may be one in which pulp other than chemical pulp is used alone or in combination of two or more.
　古紙パルプは一般に、粘着異物、夾雑物、樹脂分が多いため、合紙のパルプ原料としては、古紙パルプよりも、バージンパルプが好ましい。 Virgin pulp is more preferable as waste paper pulp than waste paper pulp because waste paper pulp generally has a large amount of sticky foreign matters, impurities, and resins.
　化学パルプの叩解度は、２００～７００ｍｌｃｓｆであることが好ましい。ここで、叩解度とは、ＪＩＳ　Ｐ８１２１によるカナダ標準ろ水度（Ｃａｎａｄｉａｎ　ｓｔａｎｄａｒｄ　ｆｒｅｅｎｅｓｓ）のことである。化学パルプの叩解度を２００～７００ｍｌｃｓｆの範囲とすることによって、合紙として必要な機械的強度と加工性を有したものとすることができる。化学パルプの叩解度が２００ｍｌｃｓｆ未満の場合は、合紙の密度が高くなって、クッション性が低くなる傾向にあるため、ガラス表面に傷が付きやすくなるおそれがある。一方、化学パルプの叩解度が７００ｍｌｃｓｆより高い場合は、紙力が弱くなるため、流通過程や製造工程において破断するおそれがある。化学パルプの叩解度は３５０～６００ｍｌｃｓｆであることがより好ましい。パルプを叩解する方法については、公知の方法を使用することができる。 叩 The degree of beating of the chemical pulp is preferably from 200 to 700 mlcsf. Here, the degree of beating refers to Canadian standard freeness according to JIS P8121. By setting the degree of beating of the chemical pulp in the range of 200 to 700 mlcsf, it is possible to obtain the mechanical strength and workability required for the slip paper. If the degree of beating of the chemical pulp is less than 200 mlcsf, the density of the interleaf paper tends to be high and the cushioning property tends to be low, so that the glass surface may be easily scratched. On the other hand, when the degree of beating of the chemical pulp is higher than 700 mlcsf, the paper strength becomes weak, and there is a possibility that the pulp may be broken in the distribution process or the manufacturing process. More preferably, the degree of beating of the chemical pulp is from 350 to 600 mlcsf. A known method can be used for beating the pulp.
（ガラス板のヤケ）
　ガラス板のヤケが発生するメカニズムとしては、従来から、次の２つのものが考えられてきた。すなわち、ガラス板表面に水滴が付着すると、ガラス中の微量のナトリウムイオンが水中に溶け出し、ガラス板表面で水酸化ナトリウムが生成し、ガラス板表面が浸食されて荒らされ、ガラス板が白濁する。また、ガラス板表面の水滴が蒸発する際に、ナトリウムイオンと空気中の二酸化炭素とが反応して、炭酸ナトリウムや炭酸水素ナトリウムが生成し、ガラス板表面に付着して、ガラス板が白濁する。 (Glass plate burns)
Conventionally, the following two mechanisms have been considered as a mechanism for causing burns on a glass plate. That is, when water droplets adhere to the surface of the glass plate, a small amount of sodium ions in the glass dissolve into water, sodium hydroxide is generated on the surface of the glass plate, the surface of the glass plate is eroded and roughened, and the glass plate becomes cloudy. . In addition, when water droplets on the surface of the glass plate evaporate, sodium ions react with carbon dioxide in the air to produce sodium carbonate or sodium bicarbonate, which adheres to the surface of the glass plate and makes the glass plate cloudy. .
　上記の従来のヤケの場合は、一般的な輝度の蛍光灯を用いてガラス板の白濁を確認することができる。ところが、タッチパネル用のガラス基板等において、上記の従来のヤケとは異なるタイプの微小（ミクロ）なヤケが存在することが明らかとなった。この微小なヤケは、高輝度のランプを用いて、暗室で検査しないと視認できないものである。タッチパネル用のガラス基板等においては、ガラス基板表面に対して微細な電子部材等が形成される。そのため、高輝度のランプを用いて暗室で検査しないと視認できないような微小なヤケであっても、断線等の不良の原因となり製品欠陥となるため、問題となる。 In the case of the above-mentioned conventional burns, it is possible to confirm the white turbidity of the glass plate using a fluorescent lamp having a general luminance. However, it has been clarified that, in a glass substrate or the like for a touch panel, there is a minute (micro) burn of a type different from the above-described conventional burn. These minute burns cannot be visually recognized unless inspected in a dark room using a high-luminance lamp. In a glass substrate or the like for a touch panel, a fine electronic member or the like is formed on the surface of the glass substrate. For this reason, even a minute burn that cannot be visually recognized unless inspected in a dark room using a high-intensity lamp causes a defect such as a disconnection and a product defect, which is a problem.
（ナトリウム）
　本発明者は、合紙が所定量のナトリウムを含有する場合、上記の微小なヤケが発生しにくい傾向があるということを見出した。すなわち、本実施形態の合紙は、ナトリウムの含有量が０．０３～１．０質量％である。ナトリウムの含有量が０．０３質量％以上であると、ヤケの発生量を低減させることができる。一方、ナトリウムの含有量が１．０質量％を超えると、ナトリウムの塩が合紙中に析出して、ガラス板を汚染する懸念がある。合紙中のナトリウムの含有量は、より好ましくは０．０５～０．５質量％であり、更に好ましくは、０．１～０．３質量％である。合紙中のナトリウムの含有量は、合紙の灰分量を測定し、更に、灰分中のナトリウムの含有量を蛍光Ｘ線分析によって測定することによって特定できる。 (sodium)
The present inventor has found that when the interleaving paper contains a predetermined amount of sodium, the above-mentioned minute burns are less likely to occur. That is, the interleaving paper of the present embodiment has a sodium content of 0.03 to 1.0% by mass. When the content of sodium is 0.03% by mass or more, the amount of burns can be reduced. On the other hand, when the content of sodium exceeds 1.0% by mass, there is a concern that a salt of sodium precipitates in the slip sheet and contaminates the glass plate. The content of sodium in the slip sheet is more preferably 0.05 to 0.5% by mass, and still more preferably 0.1 to 0.3% by mass. The sodium content in the slip sheet can be specified by measuring the ash content of the slip sheet and further measuring the sodium content in the ash content by X-ray fluorescence analysis.
　ガラス板が上記の微小なヤケを引き起こす原因とメカニズムの明確な解明は今後の研究を待たなければならないが、ガラス中のナトリウムと水の水素イオンとがイオン交換反応することが原因であろうと考えられる。そして、微小なヤケは、以下のようなメカニズムによって引き起こされると考えられる。 It is necessary to wait for further research to clarify the cause and mechanism of the glass plate causing the above-mentioned minute burns, but it is thought that the cause is the ion exchange reaction between sodium and water hydrogen ions in the glass. Can be Then, it is considered that the fine burn is caused by the following mechanism.
　タッチパネル用のガラス基板には、通常、ソーダガラス板が用いられる。ソーダガラス板はガラス板表面に硫酸塩からなる疵（きず）防止用保護膜を有している。疵防止用保護膜は、ガラス板の製造時に、ガラス板表面に亜硫酸ガスを吹き付けて、ガラス板中のナトリウムと亜硫酸ガスとを反応させ、硫酸ナトリウムをガラス板表面で生成させることによって形成される。亜硫酸ガスを吹き付けるとガラス板中のナトリウムが表面付近にブリード（移動）するため、ガラス板の表面付近はナトリウム量が欠乏した状態となる。このことが微小なヤケを引き起こすと推察される。 通常 Soda glass plate is usually used as a glass substrate for touch panels. The soda glass plate has a protective film made of sulfate on the surface of the glass plate for preventing flaws. The protective film for preventing flaws is formed by spraying a sulfurous acid gas on the surface of the glass plate during the production of the glass plate to react the sodium in the glass plate with the sulfurous acid gas to generate sodium sulfate on the surface of the glass plate. . When the sulfurous acid gas is blown, sodium in the glass plate bleeds (moves) near the surface, so that the surface region near the surface of the glass plate is in a state where the amount of sodium is deficient. This is presumed to cause slight burns.
　ところが、合紙中のナトリウムの含有量が多いと、ガラス板中のナトリウムイオンが合紙へブリード（移動）することを抑制する効果を有している。さらに、合紙中のナトリウムイオンが硫酸ナトリウムからなる疵防止用保護膜を通じてガラス板表面付近のナトリウムの欠乏部へ移動する効果も有している。その結果、ガラス板中のナトリウムイオンの存在量が安定化され、合紙中あるいは空気中の水蒸気の水素イオンとナトリウムイオンとのイオン交換反応が抑制される。このことによって、ガラス板中の水素イオンの存在量が増えることなく、ヤケの発生が低減されるものと推測される。 However, when the content of sodium in the slip sheet is large, it has an effect of suppressing bleeding (migration) of sodium ions in the glass plate to the slip sheet. Further, it also has an effect that sodium ions in the slip sheet move to a sodium-deficient portion near the surface of the glass plate through a flaw preventing protective film made of sodium sulfate. As a result, the amount of sodium ions present in the glass plate is stabilized, and the ion exchange reaction between hydrogen ions and sodium ions of water vapor in the slip sheet or air is suppressed. This is presumed to reduce the occurrence of burns without increasing the amount of hydrogen ions present in the glass plate.
　合紙中のナトリウムの含有量を０．０３～１．０質量％に制御するための方法としては、化学パルプの製造工程および抄紙工程の少なくとも１つの工程で、ナトリウムを含有する水を使用する方法（第１の方法）と、化学パルプの製造工程、抄紙工程および抄紙後の工程の少なくとも１つの工程で、ナトリウムを含有する化合物を添加する方法（第２の方法）がある。 As a method for controlling the content of sodium in the slip paper to 0.03 to 1.0% by mass, sodium-containing water is used in at least one of the chemical pulp production process and the papermaking process. There is a method (first method) and a method of adding a compound containing sodium in at least one of a chemical pulp manufacturing step, a paper making step, and a step after paper making (second method).
　第１の方法では、化学パルプの製造工程および抄紙工程の少なくとも１つの工程に用いる用水中のナトリウムの含有量を適宜制御することにより、最終的に得られる合紙中のナトリウムの含有量を調整することができる。ナトリウムは一般に水に含まれている成分である。いわゆる軟水は相対的にナトリウムの含有量が少なく、硬水には相対的に多くのナトリウムが含まれている。ナトリウムを含有する水の硬度としては、７０～５００（ｍｇ／ｌ）が好ましく、１２０～４００（ｍｇ／ｌ）がより好ましい。また、水の電気伝導率としては、１４～１００ｍＳ／ｍが好ましく、２４～３３ｍＳ／ｍがより好ましい。ナトリウムを含有する水は、化学パルプの製造工程および抄紙工程の両方で用いてもよいし、いずれか一方の工程で用いてもよい。化学パルプの製造工程または抄紙工程に用いる用水中にナトリウムが溶解していると、化学パルプは、その内部に含有するカルボキシ基が金属イオンと塩を形成して、ナトリウムを内部に保持することができる。また、紙は湿紙を乾燥して製造されるため、用水中の一定量のナトリウムを保持することができる。 In the first method, the sodium content in the finally obtained interleaf paper is adjusted by appropriately controlling the sodium content in the water used in at least one of the chemical pulp manufacturing process and the papermaking process. can do. Sodium is a component generally contained in water. So-called soft water has a relatively low sodium content, and hard water contains a relatively large amount of sodium. The hardness of the water containing sodium is preferably from 70 to 500 (mg / l), more preferably from 120 to 400 (mg / l). Further, the electric conductivity of water is preferably from 14 to 100 mS / m, more preferably from 24 to 33 mS / m. The water containing sodium may be used in both the chemical pulp manufacturing process and the papermaking process, or may be used in either one of the processes. If sodium is dissolved in the water used in the chemical pulp manufacturing process or papermaking process, the chemical pulp may retain sodium inside because the carboxy groups contained therein form salts with metal ions. it can. In addition, since paper is produced by drying wet paper, it can hold a certain amount of sodium in water.
　第２の方法としては、化学パルプの製造工程および抄紙工程の少なくとも１つの工程で原料中にナトリウムを含有する化合物を添加する方法（内添法）、化学パルプの製造工程および抄紙工程の少なくとも１つの工程でナトリウムを含有する化合物を溶解・分散させた水を用いる方法（用水法）、抄紙後の工程でナトリウムを含有する化合物を溶解・分散させた水溶液を合紙の表面に塗工する方法（塗工法）などがある。これらの中では、より効率的にナトリウムを含有させることが可能な塗工法が好ましい。 As a second method, a method of adding a compound containing sodium to a raw material in at least one of a chemical pulp production step and a paper making step (internal addition method), and at least one of a chemical pulp production step and a paper making step A method using water in which a sodium-containing compound is dissolved and dispersed in two steps (water use method), and a method in which an aqueous solution in which a sodium-containing compound is dissolved and dispersed in a post-papermaking step is applied to the surface of an interleaf paper (Coating method). Among these, a coating method capable of containing sodium more efficiently is preferable.
（硫酸ナトリウム）
　第２の方法において、ナトリウムを含有する化合物としては、硫酸ナトリウム（芒硝、Ｎａ２ＳＯ４）が好ましい。硫酸ナトリウムはガラスの原料として使用されることがある。 (Sodium sulfate)
In the second method, the sodium-containing compound is preferably sodium sulfate (Glauber's salt, Na 2 SO 4 ). Sodium sulfate may be used as a raw material for glass.
　合紙に対する硫酸ナトリウムの添加量としては０．０３～１．５質量％が好ましく、０．０５～１．０質量％がより好ましく、０．１～０．６質量％が更に好ましい。硫酸ナトリウムの添加量が１．５質量％を超えると、ガラス板の表面に硫酸ナトリウム粒子が析出して不具合が出るおそれがある。 The amount of sodium sulfate added to the slip paper is preferably 0.03 to 1.5% by mass, more preferably 0.05 to 1.0% by mass, and even more preferably 0.1 to 0.6% by mass. If the amount of sodium sulfate added exceeds 1.5% by mass, sodium sulfate particles may precipitate on the surface of the glass plate, causing a problem.
　以上説明してきたように、化学パルプに占める広葉樹パルプの割合と合紙中のナトリウムの含有量を規定することによって、ガラス板のヤケの発生を低減させることができる。 As described above, the occurrence of burns on the glass plate can be reduced by defining the ratio of the hardwood pulp in the chemical pulp and the content of sodium in the slip sheet.
（抄紙用薬品）
　合紙の抄紙時に用いる抄紙用薬品については、ガラス表面を汚染しない範囲内で、公知の各種薬品を使用することができる。抄紙用薬品としては、例えば、ポリアクリルアミド等の紙力増強剤、ポリアミドポリアミンエピクロルヒドリン等の耐水化剤、柔軟剤、帯電防止剤、消泡剤、スライムコントロール剤、填料、染料等が挙げられる。これらの抄紙用薬品はいずれもガラス板を汚染する恐れを有するものであるので、添加する場合であっても、合計で０．１質量％以下とすることが好ましい。 (Chemicals for papermaking)
Various known chemicals can be used for the papermaking chemicals used in the papermaking of the slip sheet, as long as they do not contaminate the glass surface. Examples of papermaking chemicals include paper strength enhancers such as polyacrylamide, water-resistant agents such as polyamide polyamine epichlorohydrin, softeners, antistatic agents, defoamers, slime control agents, fillers, dyes, and the like. Since all of these papermaking chemicals have a risk of contaminating the glass plate, the total amount is preferably 0.1% by mass or less even when added.
（ガラス合紙の製造方法）
　合紙の製造方法には特に制限はなく、種々の抄紙機を用いて、適切な抄造条件を選択することによって、抄造することができる。抄紙機としては、具体的に、長網フォーマ、ツインワイヤーフォーマ、円網フォーマ、傾斜フォーマなどを挙げることができる。合紙の層構成は、単層であってもよいし、多層であってもよい。合紙中のナトリウムの含有量を０．０３～１．０質量％に制御するための方法としては、前記した第１の方法または第２の方法を用いることができる。 (Method of manufacturing glass interleaving paper)
There is no particular limitation on the method for producing the slip sheet, and the slip sheet can be formed by using various paper machines and selecting appropriate forming conditions. Specific examples of the paper machine include a fourdrinier former, a twin-wire former, a circular net former, and an inclined former. The layer structure of the slip sheet may be a single layer or a multilayer. As a method for controlling the content of sodium in the slip sheet to 0.03 to 1.0% by mass, the above-described first method or second method can be used.
（ガラス合紙の特性）
　合紙の坪量は、小さい方が運搬時の質量が少なくなるため好ましいが、小さ過ぎると、ガラス板に対して十分な緩衝性を付与することができない。一方、合紙の坪量は、ある程度大きい方が緩衝性の点で好ましいが、大き過ぎると運搬時の質量が大きくなり好ましくない。緩衝性と運搬容易性とのバランス、用途を考慮すると、合紙の坪量は１０～３００ｇ／ｍ２である。また、合紙のより好ましい坪量は３０～８０ｇ／ｍ２である。 (Characteristics of glass insert)
It is preferable that the basis weight of the interleaving paper is small because the mass during transportation is small. However, if the basis weight is too small, it is not possible to impart a sufficient cushioning property to the glass plate. On the other hand, it is preferable that the basis weight of the interleaving paper is large to some extent in terms of the buffering property. In consideration of the balance between the buffering property and the ease of transport and the application, the basis weight of the slip sheet is 10 to 300 g / m 2 . The more preferable basis weight of the slip sheet is 30 to 80 g / m 2 .
　合紙の厚さは、緩衝性、作業性の観点から、２５～２５０μｍであることが好ましい。また、合紙の密度は、０．４～１．２ｇ／ｃｍ３であることが好ましい。 The thickness of the slip sheet is preferably from 25 to 250 μm from the viewpoint of cushioning and workability. The density of the slip sheet is preferably 0.4 to 1.2 g / cm 3 .
　合紙のｐＨ（ＪＩＳ　Ｐ　８１３３－２）は、中性が好ましい。 The pH of the slip paper (JIS P 8133-2) is preferably neutral.
　本実施形態の合紙は、タッチパネル用ガラス基板、液晶ディスプレイ、有機エレクトロルミネッセンスディスプレイ、プラズマディスプレイといったフラットパネルディスプレイ用のガラス基板を複数枚積層して保管、運搬する際に、ガラス基板を保護するために好適に使用される。 The slip sheet of the present embodiment is used to protect a glass substrate when storing and transporting a plurality of glass substrates for a flat panel display such as a glass substrate for a touch panel, a liquid crystal display, an organic electroluminescence display, and a plasma display. It is preferably used.
　以下、実施例により本発明を詳細に説明するが、本発明はこれらによって限定されるものではない。なお、配合を示す数値は、固形分または有効成分の質量基準の数値（質量％）である。また、特に記載のない場合については、抄造した紙はＪＩＳ　Ｐ８１１１に準じて処理を行なった後、測定および評価試験に供した。 Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. In addition, the numerical value which shows a compounding is a numerical value (mass%) of the solid content or the mass basis of an active ingredient. Unless otherwise specified, the paper was processed according to JIS P8111 and then subjected to measurement and evaluation tests.
（実施例１～４、比較例１～２）
　実施例および比較例に用いた材料は、下記のとおりである。
　広葉樹晒クラフトパルプ（ＬＢＫＰ）：市販の広葉樹晒クラフトパルプ
　針葉樹晒クラフトパルプ（ＮＢＫＰ）：市販の針葉樹晒クラフトパルプ
　硫酸ナトリウム：東ソー株式会社製、無水中性硫酸ナトリウム (Examples 1-4, Comparative Examples 1-2)
Materials used in Examples and Comparative Examples are as follows.
Hardwood bleached kraft pulp (LBKP): Commercial hardwood bleached kraft pulp Softwood bleached kraft pulp (NBKP): Commercial softwood bleached kraft pulp Sodium sulfate: Tosoh Corporation, anhydrous neutral sodium sulfate
　用水の電気伝導率の測定は、ＪＩＳ　Ｋ　０１３０：２００８に準拠して、ＨＯＲＩＢＡ社製ポータブル型電気伝導率計ＥＳ－５１を用いて測定した。 (4) The electric conductivity of the water was measured using a portable electric conductivity meter ES-51 manufactured by HORIBA in accordance with JIS K 0130: 2008.
［実施例１］
　原料パルプとして、市販ＬＢＫＰ（広葉樹晒クラフトパルプ）８０％、市販ＮＢＫＰ（針葉樹晒クラフトパルプ）２０％のバージンのパルプスラリー（叩解度４５０ｍｌｃｓｆ）を使用し、電気伝導率２５ｍＳ/ｍの用水を用いて、抄紙薬品を添加せずに、長網抄紙機で抄紙した。抄紙後、乾燥させて、坪量４０ｇ／ｍ２のガラス合紙を得た。得られたガラス合紙のナトリウム含有量は０．０５％であった。 [Example 1]
As a raw material pulp, a virgin pulp slurry (with a beating degree of 450 mlcsf) containing 80% of commercially available LBKP (hardwood bleached kraft pulp) and 20% of commercially available NBKP (softwood bleached kraft pulp) is used, and water having an electrical conductivity of 25 mS / m is used. The paper was made with a Fourdrinier without adding papermaking chemicals. After papermaking, the paper was dried to obtain a glass interleaving paper having a basis weight of 40 g / m 2 . The sodium content of the obtained glass interleaving paper was 0.05%.
［実施例２］
　電気伝導率３ｍＳ/ｍの用水を用い、合紙に対する硫酸ナトリウムの添加量が０．３％となるように、硫酸ナトリウム溶液をサイズプレスで塗布した以外は実施例１と同様にしてガラス合紙を得た。得られたガラス合紙のナトリウム含有量は、０．１０％であった。 [Example 2]
Glass insert paper in the same manner as in Example 1 except that water having an electric conductivity of 3 mS / m was used and a sodium sulfate solution was applied by a size press so that the amount of sodium sulfate added to the insert paper was 0.3%. I got The sodium content of the obtained glass interleaving paper was 0.10%.
［実施例３］
　合紙に対する硫酸ナトリウムの添加量が０．５％となるようにした以外は実施例２と同様にしてガラス合紙を得た。得られたガラス合紙のナトリウム含有量は、０．１８％であった。 [Example 3]
A glass interleaf was obtained in the same manner as in Example 2, except that the amount of sodium sulfate added to the interleaf was 0.5%. The sodium content of the obtained glass interleaving paper was 0.18%.
［実施例４］
　原料パルプを市販ＬＢＫＰ（広葉樹晒クラフトパルプ）４０％、市販ＮＢＫＰ（針葉樹晒クラフトパルプ）６０％のバージンのパルプスラリー（叩解度４５０ｍｌｃｓｆ）を使用した以外は実施例３と同様にしてガラス合紙を得た。得られたガラス合紙のナトリウム含有量は、０．１８％であった。 [Example 4]
Glass insert paper was prepared in the same manner as in Example 3 except that virgin pulp slurry (beating degree: 450 mlcsf) of 40% of commercial LBKP (hardwood bleached kraft pulp) and 60% of commercial NBKP (softwood bleached kraft pulp) was used as the raw material pulp. Obtained. The sodium content of the obtained glass interleaving paper was 0.18%.
［比較例１］
　硫酸ナトリウムを添加しなかった以外は、実施例２と同様にして、ガラス合紙を得た。得られたガラス合紙のナトリウム含有量は、０．０１％であった。 [Comparative Example 1]
A glass interleaf was obtained in the same manner as in Example 2 except that sodium sulfate was not added. The sodium content of the obtained glass interleaving paper was 0.01%.
［比較例２］
　原料パルプを市販ＮＢＫＰ（針葉樹晒クラフトパルプ）１００％のバージンのパルプスラリー（叩解度４５０ｍｌｃｓｆ）を使用した以外は実施例３と同様にしてガラス合紙を得た。得られたガラス合紙のナトリウム含有量は、０．１８％であった。 [Comparative Example 2]
A glass interleaf was obtained in the same manner as in Example 3 except that a 100% virgin pulp slurry (with a beating degree of 450 mlcsf) of 100% commercial NBKP (softwood bleached kraft pulp) was used as the raw material pulp. The sodium content of the obtained glass interleaving paper was 0.18%.
（評価内容）
　得られたガラス合紙の評価内容は以下のとおりである。
＜合紙中のナトリウムの含有量＞
　ガラス合紙の灰分をＪＩＳ　Ｐ８２５１に準じて求めた。得られた灰分中のナトリウムの含有量（質量％）は、蛍光Ｘ線分析装置（日本電子株式会社製、ＪＳＸ－３６００Ｍ）を用いて質量濃度の測定値から得た。ガラス合紙中のナトリウム含有量ｍ（質量％）を次式（１）によって求めた。
　　　ｍ＝ａ×ｂ・・・（１）
　　　ここで、ｍ：ナトリウム含有量（質量％）
　　　　　　　ａ：ガラス合紙の灰分（質量％）
　　　　　　　ｂ：灰分中のナトリウム含有量（質量％） (Content of evaluation)
The evaluation contents of the obtained glass interleaf paper are as follows.
<Sodium content in interleaving paper>
The ash content of the glass interleaving paper was determined according to JIS P8251. The sodium content (% by mass) in the obtained ash was obtained from the measured value of the mass concentration using a fluorescent X-ray analyzer (JSX-3600M, manufactured by JEOL Ltd.). The sodium content m (% by mass) in the glass interleaving paper was determined by the following equation (1).
m = a × b (1)
Here, m: sodium content (% by mass)
a: Ash content of glass interleaf paper (% by mass)
b: sodium content in ash (% by mass)
＜ガラス板のヤケの評価＞
　２１０ｍｍ×２１０ｍｍガラス合紙に２００ｍｍ×２００ｍｍのタッチパネル用ガラス板を載せ、その組み合わせを３セット交互に積層し、その上に１ｋｇの錘を載せて圧力を掛け、温度５０℃、湿度９０％ＲＨの環境下に４日間静置して試料とした。ガラス板の表面を水洗いし、乾燥させた後、暗室にて高輝度ランプを照射してガラス板表面の白濁を観察した（ｎ＝３）。ガラス板のヤケの評価を以下の基準で行った。Ａを合格と判定した。
　　Ａ：曇りがない
　　Ｂ：一部に曇りがある
　　Ｃ：曇りがある <Evaluation of burnt glass plate>
A glass plate for a touch panel of 200 mm × 200 mm is placed on a 210 mm × 210 mm glass interleaving paper, three sets of the combinations are alternately laminated, and a 1 kg weight is placed thereon to apply pressure, and a temperature of 50 ° C. and a humidity of 90% RH is applied. The sample was allowed to stand for 4 days in an environment. After the surface of the glass plate was washed with water and dried, it was irradiated with a high-intensity lamp in a dark room to observe cloudiness on the surface of the glass plate (n = 3). The scoring of the glass plate was evaluated according to the following criteria. A was determined to be acceptable.
A: no fogging B: some fogging C: fogging
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に、実施例１～４よび比較例１～２の評価結果を示した。実施例１～４のガラス合紙は、ガラス板のヤケに優れていた。一方、比較例１～２のガラス合紙は、ガラス板のヤケが劣っていた。 Table 1 shows the evaluation results of Examples 1 to 4 and Comparative Examples 1 and 2. The glass slip sheets of Examples 1 to 4 were excellent in scorching of the glass plate. On the other hand, the glass sheets of Comparative Examples 1 and 2 were inferior in the burnt of the glass plate.

Claims (4)

  1. 　化学パルプを主成分とし、ナトリウムの含有量が０．０３～１．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙であって、
    　前記化学パルプに占める広葉樹パルプの割合が１０質量％以上であるガラス合紙。     Glass interleaving paper containing a chemical pulp as a main component, a sodium content of 0.03 to 1.0% by mass, and a basis weight of 10 to 300 g / m 2 ,
    A glass insert paper in which the ratio of hardwood pulp to the chemical pulp is 10% by mass or more.
  2. 　請求項１に記載のガラス合紙を製造する方法であって、前記化学パルプの製造工程および抄紙工程の少なくとも１つの工程で、ナトリウムを含有する水を使用することを特徴とするガラス合紙の製造方法。 The method for producing a glass insert according to claim 1, wherein water containing sodium is used in at least one of the chemical pulp production step and the papermaking step. Production method.
  3. 　請求項１に記載のガラス合紙を製造する方法であって、前記化学パルプの製造工程、抄紙工程および抄紙後の工程の少なくとも１つの工程で、ナトリウムを含有する化合物を添加することを特徴とするガラス合紙の製造方法。 The method for producing a glass interleaving paper according to claim 1, wherein a compound containing sodium is added in at least one of the chemical pulp production process, the papermaking process, and the post-papermaking process. Production method of glass interleaving paper.
  4. 　前記ナトリウムを含有する化合物が硫酸ナトリウムであることを特徴とする請求項３に記載のガラス合紙の製造方法。 方法 The method for producing a glass slip sheet according to claim 3, wherein the sodium-containing compound is sodium sulfate.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06316432A (en) * 1993-05-06 1994-11-15 Asahi Glass Co Ltd Laminated paper for glass
JPH0741034A (en) 1993-08-04 1995-02-10 Asahi Glass Co Ltd Slip sheet for glass plate
JPH07101483A (en) * 1993-10-01 1995-04-18 Asahi Glass Co Ltd Guard sheet for plate glass
JP2013212939A (en) * 2012-03-30 2013-10-17 Avanstrate Inc Glass plate laminate and method for producing glass plate
JP2014095163A (en) * 2012-11-08 2014-05-22 Oji Holdings Corp Antistatic glass joined paper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102277785A (en) * 2011-08-24 2011-12-14 陕西科技大学 Method for producing external bag paper of apple cultivating bag by coating process
JP6171327B2 (en) * 2012-12-19 2017-08-02 旭硝子株式会社 Glass interleaving paper and glass plate packaging
US20150090413A1 (en) * 2012-12-27 2015-04-02 Tokushu Tokai Paper Co., Ltd. Wood pulp for glass plate-interleaving paper and glass plate-interleaving paper
JP2014145138A (en) * 2013-01-28 2014-08-14 Daio Paper Corp Glass slip sheet and laminate
US9927717B2 (en) 2013-12-18 2018-03-27 Asml Netherlands B.V. Inspection method and apparatus, and lithographic apparatus
CN105586802B (en) * 2016-02-19 2017-06-20 岳阳林纸股份有限公司 A kind of manufacture method of the rich body paper of product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06316432A (en) * 1993-05-06 1994-11-15 Asahi Glass Co Ltd Laminated paper for glass
JPH0741034A (en) 1993-08-04 1995-02-10 Asahi Glass Co Ltd Slip sheet for glass plate
JPH07101483A (en) * 1993-10-01 1995-04-18 Asahi Glass Co Ltd Guard sheet for plate glass
JP2013212939A (en) * 2012-03-30 2013-10-17 Avanstrate Inc Glass plate laminate and method for producing glass plate
JP2014095163A (en) * 2012-11-08 2014-05-22 Oji Holdings Corp Antistatic glass joined paper

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