WO2019208690A1 - Glass interleaving paper and method for manufacturing same - Google Patents

Glass interleaving paper and method for manufacturing same Download PDF

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Publication number
WO2019208690A1
WO2019208690A1 PCT/JP2019/017605 JP2019017605W WO2019208690A1 WO 2019208690 A1 WO2019208690 A1 WO 2019208690A1 JP 2019017605 W JP2019017605 W JP 2019017605W WO 2019208690 A1 WO2019208690 A1 WO 2019208690A1
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Prior art keywords
glass
group
interleaving paper
paper
pulp
Prior art date
Application number
PCT/JP2019/017605
Other languages
French (fr)
Japanese (ja)
Inventor
萩原　浩一
Original Assignee
王子ホールディングス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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 CN201980027245.4A priority Critical patent/CN112004969A/en
Priority to JP2020515558A priority patent/JP7334733B2/en
Publication of WO2019208690A1 publication Critical patent/WO2019208690A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
    • B65D57/002—Separators for articles packaged in stacks or groups, e.g. stacked or nested
    • B65D57/003—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles
    • B65D57/004—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles the articles being substantially flat panels, e.g. wooden planks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/48—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for glass sheets
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

  • the present invention relates to a glass slip sheet inserted between glass plates and a method for producing the same.
  • glass substrates As glass substrates become larger and mass-produced, glass substrates are often transported in layers for the purpose of improving transport efficiency.
  • the contact pressure between the glass interleaving paper and the glass substrate increases, so that the probability that a trace component, foreign matter, etc. in the glass interleaving paper adhere (contaminate) to the glass substrate increases.
  • a higher degree of clarity is required on the surface of the glass substrate. Under these circumstances, the quality requirement level for glass interleaving paper is becoming increasingly sophisticated.
  • the resin component in the glass slip sheet may adhere to the glass substrate surface and the glass substrate surface may become water repellent.
  • the soda glass used with the glass substrate for touch panels when the contact period of a paper surface and the glass substrate surface becomes long, there exists a problem that a paper skin pattern and a burn are easy to produce on the glass substrate surface. Discoloration is caused by an ion exchange reaction between water and soluble components such as sodium ions in the glass substrate, and the glass substrate surface is eroded and roughened, or elution components react with acidic gases such as carbon dioxide in the air. This is a phenomenon in which the reaction product precipitates and the surface appears white and cloudy.
  • the resin content in the glass slip is mainly an adhesive natural resin derived from wood.
  • the resin component is a resin acid (abietic acid), a fatty acid (stearic acid, oleic acid), etc. released from wood, pulp and paper in the raw pulp manufacturing process and the process of making glass interleaving paper from raw pulp.
  • abietic acid abietic acid
  • stearic acid stearic acid, oleic acid
  • etc. released from wood, pulp and paper in the raw pulp manufacturing process and the process of making glass interleaving paper from raw pulp.
  • a pitch control agent may be used in order to reduce adverse effects caused by the resin component.
  • the pitch control agent is an additive for preventing the resin component from adhering to the manufacturing apparatus or the like in the glass interleaf manufacturing process or papermaking process.
  • talc sulfate band (aluminum sulfate), Surfactants, cationic polymers and the like are used.
  • the surface of a glass plate, particularly a glass substrate used for a flat panel display, is cleaned with a medium mainly composed of water before shipment or before a mounting process for electronic components or the like. This cleaning process will wash away most of the foreign substances such as paper dust that have adhered to the glass substrate surface, but adhesive resin and foreign substances, substances with high affinity with glass, etc. will adhere to the glass substrate surface even after cleaning. May have.
  • Patent Document 1 reduces the ratio of talc present on the surface, and instead uses a surfactant, a cationic polymer, a sulfate band (aluminum sulfate), etc. as a non-talc pitch control agent. It is disclosed.
  • Patent Document 2 discloses a glass plate interleaf containing zeolite as a glass plate interleaf that suppresses the occurrence of burns on the glass plate and does not cause water repellency of the glass plate and adhesion of paper traces. Yes.
  • the present invention has been made in view of the above situation. That is, the object of the present invention is to suppress the occurrence of burns on the glass plate, reduce the adhesion of the resin in the glass interleaving paper to the glass plate, and reduce the water repellency of the glass plate surface. It is to provide a slip and its manufacturing method.
  • the present inventor has examined the influence of metal ions on the generation of burns.
  • glass interleaving paper having a relatively large content of Group 2 elements such as calcium and magnesium is not easily burned. It has been found that the occurrence is reduced. Further, it has been found that when a predetermined amount of a Group 2 element is added to glass interleaving paper, the occurrence of burns is reduced and water repellency is also reduced.
  • the present invention was born based on such knowledge. That is, the present invention has the following configuration.
  • Glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2 .
  • a method for producing glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2.
  • a method for producing glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2.
  • a method for producing glass interleaving paper comprising adding a compound containing the Group 2 element to the chemical pulp in at least one of the chemical pulp production process, the papermaking process, and the post-papermaking process.
  • the glass interleaving paper of the present invention it is possible to suppress the occurrence of burns on the glass plate, reduce the adhesion of the resin in the glass interleaving paper to the glass plate, and reduce the water repellency of the glass plate surface . Moreover, according to the manufacturing method of the glass interleaving paper of this invention, the said glass interleaving paper can be manufactured.
  • the glass interleaving paper of this embodiment contains chemical pulp as a main component and contains a Group 2 element.
  • chemical pulp as a main component
  • the glass interleaving paper of this embodiment (hereinafter also referred to as “interleaving paper” as appropriate) has chemical pulp as a main component.
  • the chemical pulp as a main component means that the chemical pulp exceeds 50% by mass with respect to the mass of the slip sheet.
  • the mass of the chemical pulp is preferably 70% by mass or more, and more preferably 90% by mass or more with respect to the mass of the slip sheet.
  • Chemical pulp refers to cellulose pulp produced through a chemical process, and examples thereof include kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP). In the case of chemical pulp made from wood, it may be a softwood pulp, a hardwood pulp, or a mixture thereof.
  • wood pulp kraft pulp (KP) having a low content of an adhesive natural resin derived from wood is suitable.
  • KP kraft pulp
  • chemical pulp which does not use wood as a raw material the non-wood fiber pulp which uses a cocoon, a three base, hemp, kenaf etc. as a raw material is mentioned, for example.
  • Semi-chemical pulps such as semi-chemical pulp (SCP) and Chemi-Grandwood pulp (CGP); groundwood pulp (GP), thermomechanical pulp (TMP, BCTMP), refiner Grandwood pulp (RGP) And other mechanical pulps.
  • SCP semi-chemical pulp
  • CGP Chemi-Grandwood pulp
  • GP groundwood pulp
  • TMP thermomechanical pulp
  • RGP refiner Grandwood pulp
  • the glass interleaving paper of this embodiment may be a mixture of one or more pulps other than chemical pulp.
  • waste paper pulp generally has a large amount of adhesive foreign matter, impurities, and resin
  • virgin pulp is preferable to waste paper pulp as a raw material for pulp.
  • the beating degree of chemical pulp is preferably 200 to 700 mlcsf.
  • the beating degree is a Canadian standard freeness according to JIS P8121.
  • the beating degree of the chemical pulp is less than 200 mlcsf, the density of the interleaf is increased and the cushioning property is lowered, so that the glass surface is easily damaged.
  • the beating degree of the chemical pulp is higher than 700 mlcsf, the paper strength becomes weak, and thus there is a risk of breaking in the distribution process and the manufacturing process.
  • the beating degree of the chemical pulp is 350 to 600 mlcsf.
  • a known method can be used as a method of beating the pulp in order to adjust the beating degree to 200 to 700 mlcsf.
  • the Group 2 element is a Group 2 metal element such as calcium, magnesium, barium, beryllium, or strontium. Among these, at least one of calcium and magnesium is important as the Group 2 element contained in the slip sheet. Water with a high content of calcium and magnesium metal ions is called hard water, and water with a low content is called soft water. The hardness of water is represented by the amount of calcium and magnesium metal ions (mg / l) contained in the water. In addition, electrical conductivity is used as an index of water hardness.
  • the interleaf paper mainly consists of cellulose pulp, but the pulp has a carboxy group in the hemicellulose component. And the carboxy group in a pulp reacts with the ion (calcium ion, magnesium ion, etc.) of the Group 2 element in the water used for a pulp manufacturing process or a papermaking process, and produces a salt.
  • the hardness (electric conductivity) of the water to be used is low, less salt is produced, and when the water hardness is high, more salt is produced.
  • more salt can be generated.
  • the present inventor generally used the use of water having a high Group 2 element content during the production of slip paper, as compared with the case of using water having a low Group 2 element content. I found out that it tends to be difficult to do. A clear elucidation of the reason why the interleaf paper causes burns has to wait for further research, but if there are many carboxy groups (-COOH) in the pulp, the ions of the liberated hydrogen ions and sodium ions in the glass It is estimated that the amount of exchange increases and the amount of burns increases. However, the reaction with the Group 2 element in the water used for the production of the slip paper produced a salt by exchanging hydrogen ions and Group 2 element ions, and liberated the carboxy group (—COOH) in the pulp. When the hydrogen ion content is reduced, the amount of burns generated is considered to be reduced.
  • the resin content in the slip sheet is a compound having a carboxy group such as resin acid (abietic acid) or fatty acid (stearic acid, oleic acid), and is present as a colloidal pitch in the pulp suspension.
  • resin acid abietic acid
  • fatty acid stearic acid, oleic acid
  • the binding force between the resin component (colloidal pitch) and the pulp fiber is caused by the fixing action to the pulp fiber due to the charge force of the divalent cation generated from the Group 2 element. It is thought to increase. As a result, the transfer amount of the resin component to the glass plate is reduced, and the adhesion (contamination) of the resin component to the glass plate is considered to be reduced.
  • the resin component reacts with ions of Group 2 elements in the water used in the pulp production process and papermaking process, similarly to the carboxy group of the pulp, to generate a salt. If the resin acid or fatty acid is converted to a salt, the solubility in water decreases and the melting point increases. Furthermore, when fatty acid or resin acid is changed to a salt such as fatty acid calcium or resin acid calcium, the adhesiveness is reduced, the affinity with the glass plate is lowered, and the adhesion (contamination) to the glass plate is considered to be reduced. .
  • the content of the Group 2 element is 0.1 to 3.0% by mass.
  • the content of the Group 2 element is 0.1% by mass or more, the content of hydrogen ions liberated from carboxy groups in the pulp decreases, and the amount of burns generated can be reduced. Moreover, the adhesion of the resin to the glass plate can be reduced, and consequently the water repellency of the glass plate surface can be reduced.
  • the content of the Group 2 element exceeds 3.0% by mass, there is a concern that the salt of the Group 2 element precipitates in the interleaf and contaminates the glass plate.
  • the content of the Group 2 element is more preferably 0.15 to 0.5% by mass.
  • the content of the Group 2 element in the slip paper can be determined by measuring the ash content of the slip paper, and further measuring the content of the Group 2 element in the ash content by fluorescent X-ray analysis.
  • the Group 2 element is added in at least one of the chemical pulp manufacturing process and the papermaking process.
  • the group 2 in the interleaving paper finally obtained by appropriately controlling the content of the group 2 element in the water used in at least one of the chemical pulp manufacturing process and the papermaking process.
  • the content of the element can be adjusted.
  • the hardness of water containing a Group 2 element is preferably 70 to 500 (mg / l), more preferably 120 to 400 (mg / l).
  • the electrical conductivity of water is preferably 14 to 100 mS / m, more preferably 24 to 33 mS / m.
  • Water containing a Group 2 element may be used in both the chemical pulp production process and the papermaking process, or in any one of the processes.
  • the metal ions of the Group 2 element are dissolved in the water used for the chemical pulp manufacturing process or the papermaking process, the chemical pulp has a carboxy group contained therein to form a salt with the metal ions.
  • Group elements can be retained inside.
  • the second method includes a method of adding a compound containing a Group 2 element in the raw material in at least one of the chemical pulp manufacturing process and the papermaking process (internal addition method), the chemical pulp manufacturing process, and the papermaking process.
  • An addition method a method of using water in which a compound containing a Group 2 element is dissolved and dispersed in at least one step of the above (water use method), and an aqueous solution in which a compound containing a Group 2 element is dissolved and dispersed in a step after papermaking
  • the compound containing a Group 2 element is preferably calcium carbonate.
  • Calcium carbonate is an additive conventionally used as a filler for various papers. Since calcium carbonate is hardly soluble in water, most of the calcium carbonate can be retained on paper as a solid content, but a part of it is dissolved. The solubility in water is 0.00015 mol / L (25 ° C.), which produces calcium ions.
  • the calcium carbonate aqueous solution is basic.
  • the amount of calcium carbonate added to the interleaving paper is preferably 0.15 to 3.0% by mass, more preferably 0.3 to 1.5% by mass. If the added amount of calcium carbonate exceeds 3.0% by mass, the solubility of calcium carbonate is exceeded, and the calcium carbonate particles are retained in the slip sheet, and there is a concern of contaminating the glass plate. Therefore, it is preferable that the amount of calcium carbonate added is as small as possible. In order to reduce the content of calcium carbonate particles precipitated in the interleaf, it is preferable not to use a yield improver so that the calcium carbonate particles are not retained in the interleaf. As calcium carbonate, light calcium carbonate by a synthetic method is preferable because there are few impurities.
  • the occurrence of burns in the glass sheet is suppressed, and the adhesion of the resin content in the slip sheet to the glass sheet is reduced.
  • the water repellency of the glass plate surface can be reduced.
  • Paper making chemicals As the papermaking chemicals used when making the interleaf paper, various known chemicals can be used as long as they do not contaminate the glass surface. Examples of papermaking chemicals include paper strength enhancers such as polyacrylamide, water resistance agents such as polyamide polyamine epichlorohydrin, softeners, antistatic agents, antifoaming agents, slime control agents, fillers, and dyes. Any of these papermaking chemicals may contaminate the glass plate. Therefore, even when added, the total is preferably 0.1% by mass or less.
  • the layer structure of the interleaving paper may be a single layer or a multilayer.
  • the first method or the second method described above can be used as a method for controlling the content of the Group 2 element in the interleaf paper to 0.1 to 3.0% by mass.
  • a smaller basis weight of the interleaving paper is preferable because the mass during transportation decreases, but if it is too small, sufficient buffering properties cannot be imparted to the glass plate.
  • the basis weight of the interleaving paper is preferably large to some extent from the viewpoint of buffering properties, but if it is too large, the mass during transportation becomes large, which is not preferable.
  • the basis weight of the interleaving paper is 10 to 300 g / m 2 .
  • the more preferable basis weight of the interleaving paper is 35 to 80 g / m 2 .
  • the thickness of the interleaving paper is preferably 25 to 250 ⁇ m from the viewpoint of buffer properties and workability.
  • the density of the slip sheet is preferably 0.4 to 1.2 g / cm 3 .
  • the pH of the slip sheet (JIS P 8133-2) is preferably neutral or alkaline. Specifically, the pH of the slip sheet is preferably 6 or more, and more preferably 8 or more.
  • the slip sheet of the present embodiment protects the glass substrate when a plurality of glass substrates for flat panel displays such as a touch panel glass substrate, a liquid crystal display, an organic electroluminescence display, and a plasma display are stacked and stored and transported. Used for.
  • a plurality of glass substrates for flat panel displays such as a touch panel glass substrate, a liquid crystal display, an organic electroluminescence display, and a plasma display are stacked and stored and transported. Used for.
  • blending is a numerical value (mass%) of the mass reference
  • Example 1 to 4 Comparative Example 1
  • the materials used in Examples and Comparative Examples are as follows.
  • Light calcium carbonate TP-121-5S manufactured by Okutama Kogyo Co., Ltd.
  • the electrical conductivity of water was measured using a portable electrical conductivity meter ES-51 manufactured by HORIBA in accordance with JIS K 0130: 2008.
  • Example 1 As raw material pulp, commercially available NBKP (conifer bleach bleached kraft pulp) 100% virgin pulp slurry (beating degree 450ml csf) is used, water with electrical conductivity of 25mS / m is used, and paper mesh is not added. Paper was made with a paper machine. After making the paper, it was dried to obtain a glass interleaving paper having a basis weight of 50 g / m 2 . The obtained glass interleaving paper had a Group 2 element content of 0.21% and a pH (JIS P 8133-2) of 6.6.
  • Example 2 Glass interleaving paper was obtained in the same manner as in Example 1 except that 0.3% by mass of light calcium carbonate was added to the absolutely dry pulp and water having an electric conductivity of 3 mS / m was used.
  • the obtained glass interleaving paper had a Group 2 element content of 0.17% and a pH (JIS P 8133-2) of 6.6.
  • Example 3 Glass interleaving paper was obtained in the same manner as in Example 2 except that the addition amount of light calcium carbonate was changed to 0.9% by mass.
  • the obtained glass interleaving paper had a Group 2 element content of 0.25% and a pH (JIS P 8133-2) of 9.3.
  • Example 4 Glass interleaving paper was obtained in the same manner as in Example 2 except that the addition amount of light calcium carbonate was changed to 3% by mass.
  • the obtained glass interleaving paper had a Group 2 element content of 0.41% and a pH (JIS P 8133-2) of 9.4.
  • Example 1 A glass interleaving paper was obtained in the same manner as in Example 2 except that light calcium carbonate was not added.
  • the obtained glass interleaving paper had a Group 2 element content of 0.08% and a pH (JIS P 8133-2) of 6.5.
  • the evaluation contents of the obtained glass slip sheet are as follows. ⁇ Content of Group 2 element in interleaving paper> The ash content of the glass interleaving paper was determined according to JIS P8251. The content (mass%) of the Group 2 element 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 group 2 element content m (mass%) in the glass interleaving paper was calculated
  • required by following Formula (1). m a ⁇ b (1)
  • m Group 2 element content (mass%)
  • b Group 2 element content in ash (mass%)
  • Table 1 shows the evaluation results of Examples 1 to 4 and Comparative Example 1.
  • the glass interleaving papers of Examples 1 to 4 were excellent in the burning and water repellency of the glass plate.
  • Examples 1 to 3 in which the content of the Group 2 element was 0.17 to 0.25% by mass were more excellent in the burnt of the glass plate.
  • the glass interleaving paper of Comparative Example 1 was inferior in the burning and water repellency of the glass plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Packaging Frangible Articles (AREA)
  • Buffer Packaging (AREA)

Abstract

Provided are a glass interleaving paper capable of preventing a glass sheet from tarnishing, reducing sticking of a resin component in the glass interleaving paper to a glass sheet and lowering water repellency of the surface of a glass sheet, and a method for manufacturing the glass interleaving paper. The glass interleaving paper comprises a chemical pulp as a main component, contains 0.1-3.0 mass% of a Group 2 element and has a basis weight of 10-300 g/m2. The method for manufacturing the glass interleaving paper is characterized in that water containing the Group 2 element is used in a step for producing the chemical pulp and/or in a paper making step. Further, the method for manufacturing the glass interleaving paper is characterized in that a compound containing the Group 2 element is added to the chemical pulp at least in one of the step for producing the chemical pulp, the paper making step and a post-paper making step.

Description

ガラス合紙とその製造方法Glass interleaving paper 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, the demand for quality for glass slip sheets has become stricter due to the diversification of glass plates. For example, in a glass substrate used for a flat panel display such as a liquid crystal display, fine electronic members are formed on the surface of the glass substrate. This causes product defects. Therefore, a high degree of clarity is required on the glass substrate surface.
　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付着する（汚染する）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。 As glass substrates become larger and mass-produced, glass substrates are often transported in layers for the purpose of improving transport efficiency. When the glass substrates are stacked, the contact pressure between the glass interleaving paper and the glass substrate increases, so that the probability that a trace component, foreign matter, etc. in the glass interleaving paper adhere (contaminate) to the glass substrate increases. On the other hand, with high-definition processing on a glass substrate, a higher degree of clarity is required on the surface of the glass substrate. Under these circumstances, the quality requirement level for glass interleaving paper is 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。ガラス合紙中の樹脂分がガラス基板表面に付着して、ガラス基板表面が撥水性になる場合がある。また、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、紙面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て、表面が白く曇って見える現象である。 There are several possible causes for contamination of the glass substrate surface. The resin component in the glass slip sheet may adhere to the glass substrate surface and the glass substrate surface may become water repellent. Moreover, in the soda glass used with the glass substrate for touch panels, when the contact period of a paper surface and the glass substrate surface becomes long, there exists a problem that a paper skin pattern and a burn are easy to produce on the glass substrate surface. Discoloration is caused by an ion exchange reaction between water and soluble components such as sodium ions in the glass substrate, and the glass substrate surface is eroded and roughened, or elution components react with acidic gases such as carbon dioxide in the air. This is a phenomenon in which the reaction product precipitates and the surface appears white and cloudy.
　ガラス合紙中の樹脂分は主に、木材由来の粘着性天然樹脂である。樹脂分は、原料パルプの製造工程や原料パルプからガラス合紙を抄造する工程で、木材、パルプおよび紙から遊離した樹脂酸（アビエチン酸）、脂肪酸（ステアリン酸、オレイン酸）等である。これらの樹脂分がガラス基板の表面に付着すると、ガラス基板表面が撥水性となるため、ガラス基板表面への微細な電子回路の形成が阻害される。 The resin content in the glass slip is mainly an adhesive natural resin derived from wood. The resin component is a resin acid (abietic acid), a fatty acid (stearic acid, oleic acid), etc. released from wood, pulp and paper in the raw pulp manufacturing process and the process of making glass interleaving paper from raw pulp. When these resin components adhere to the surface of the glass substrate, the surface of the glass substrate becomes water-repellent, so that formation of fine electronic circuits on the surface of the glass substrate is hindered.
　パルプの製造工程や抄紙工程においては、樹脂分による弊害を低減させるために、ピッチコントロール剤が使用されることがある。ピッチコントロール剤とは、ガラス合紙の製造工程や抄紙工程で、樹脂分が製造装置等に付着しないようにするための添加剤であり、具体的には、タルク、硫酸バンド（硫酸アルミニウム）、界面活性剤、カチオン系ポリマー等が使用されている。 In the pulp manufacturing process and papermaking process, a pitch control agent may be used in order to reduce adverse effects caused by the resin component. The pitch control agent is an additive for preventing the resin component from adhering to the manufacturing apparatus or the like in the glass interleaf manufacturing process or papermaking process. Specifically, talc, sulfate band (aluminum sulfate), Surfactants, cationic polymers and the like are used.
　ガラス板、特にフラットパネルディスプレイ用として用いられるガラス基板の表面は、出荷前や電子部品等の実装工程前に、水を主体とする媒体で洗浄される。この洗浄工程により、ガラス基板表面に付着した紙粉等の異物はほとんど洗い流されるが、粘着性を有する樹脂分や異物、ガラスとの親和性の高い物質等は、洗浄後もガラス基板表面に付着している場合がある。 The surface of a glass plate, particularly a glass substrate used for a flat panel display, is cleaned with a medium mainly composed of water before shipment or before a mounting process for electronic components or the like. This cleaning process will wash away most of the foreign substances such as paper dust that have adhered to the glass substrate surface, but adhesive resin and foreign substances, substances with high affinity with glass, etc. will adhere to the glass substrate surface even after cleaning. May have.
　このようなガラス基板表面の汚染を防止するために、種々の方法が提案されている。例えば、特許文献１には、表面に存在するタルクの割合を低減させ、代わりに、非タルク系のピッチコントロール剤として界面活性剤、カチオン系ポリマー、硫酸バンド（硫酸アルミニウム）等を使用することが開示されている。 In order to prevent such contamination of the glass substrate surface, various methods have been proposed. For example, Patent Document 1 reduces the ratio of talc present on the surface, and instead uses a surfactant, a cationic polymer, a sulfate band (aluminum sulfate), etc. as a non-talc pitch control agent. It is disclosed.
　また、特許文献２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。 Further, Patent Document 2 discloses a glass plate interleaf containing zeolite as a glass plate interleaf that suppresses the occurrence of burns on the glass plate and does not cause water repellency of the glass plate and adhesion of paper traces. Yes.
特開２０１６－１２５１４６号公報JP 2016-125146 A 特開平７－４１０３４号公報JP 7-41034 A
　特許文献１に記載のピッチコントロール剤を使用する方法では、樹脂分とピッチコントロール剤からなる凝集物が生じることがあるので、極めて高い清澄性が要求されるガラス基板向けの合紙用途には必ずしも十分なものではなかった。また、特許文献２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十分ではなかった。 In the method using the pitch control agent described in Patent Document 1, since an agglomerate composed of a resin component and a pitch control agent may be generated, it is not necessarily used for a slip sheet for glass substrates that require extremely high clarity. It was not enough. Moreover, in the method of blending the zeolite described in Patent Document 2, the effect on burns is not sufficient.
　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抑制し、ガラス合紙中の樹脂分のガラス板への付着を低減させ、ガラス板表面の撥水性化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, the object of the present invention is to suppress the occurrence of burns on the glass plate, reduce the adhesion of the resin in the glass interleaving paper to the glass plate, and reduce the water repellency of the glass plate surface. It is to provide a slip and its manufacturing method.
　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、カルシウムやマグネシウム等の第２族元素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を見出した。また、ガラス合紙に第２族元素を所定量添加すると、ヤケの発生が少なくなり、撥水性化も低減することを見出した。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。 In order to solve the above-mentioned problems, the present inventor has examined the influence of metal ions on the generation of burns. As a result, glass interleaving paper having a relatively large content of Group 2 elements such as calcium and magnesium is not easily burned. It has been found that the occurrence is reduced. Further, it has been found that when a predetermined amount of a Group 2 element is added to glass interleaving paper, the occurrence of burns is reduced and water repellency is also reduced. The present invention was born 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、第２族元素の含有量が０．１～３．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙。 (1) Glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2 .
（２）前記第２族元素がカルシウムおよびマグネシウムの少なくとも一方である前記（１）に記載のガラス合紙。 (2) The glass interleaving paper according to (1), wherein the Group 2 element is at least one of calcium and magnesium.
（３）化学パルプを主成分とし、第２族元素の含有量が０．１～３．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙の製造方法であって、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、前記第２族元素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。 (3) A method for producing glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2. A method for producing glass interleaving paper, wherein water containing the Group 2 element is used in at least one of the chemical pulp production process and the papermaking process.
（４）化学パルプを主成分とし、第２族元素の含有量が０．１～３．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙の製造方法であって、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、前記化学パルプに前記第２族元素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。 (4) A method for producing glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2. A method for producing glass interleaving paper, comprising adding a compound containing the Group 2 element to the chemical pulp in at least one of the chemical pulp production process, the papermaking process, and the post-papermaking process.
（５）前記第２族元素を含有する化合物が炭酸カルシウムであることを特徴とする前記（４）に記載のガラス合紙の製造方法。 (5) The method for producing glass interleaving paper as described in (4) above, wherein the compound containing the Group 2 element is calcium carbonate.
　本発明のガラス合紙によれば、ガラス板のヤケの発生を抑制し、ガラス合紙中の樹脂分のガラス板への付着を低減させ、ガラス板表面の撥水性化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 suppress the occurrence of burns on the glass plate, reduce the adhesion of the resin in the glass interleaving paper to the glass plate, and reduce the water repellency of the glass plate surface . Moreover, according to the manufacturing method of the glass interleaving paper of this invention, the said glass interleaving paper 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 following embodiments are merely examples, and the present invention should not be 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、第２族元素を含有する。以下、各成分について説明する。 The glass interleaving paper of this embodiment contains chemical pulp as a main component and contains a Group 2 element. 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。化学パルプの質量は、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。木材を原料とする化学パルプの場合は、針葉樹パルプでも広葉樹パルプでもよく、またはこれらを混合したものでもよい。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。 (Chemical pulp)
The glass interleaving paper of this embodiment (hereinafter also referred to as “interleaving paper” as appropriate) has chemical pulp as a main component. Here, the chemical pulp as a main component means that the chemical pulp exceeds 50% by mass with respect to the mass of the slip sheet. The mass of the chemical pulp is preferably 70% by mass or more, and more preferably 90% by mass or more with respect to the mass of the slip sheet. Chemical pulp refers to cellulose pulp produced through a chemical process, and examples thereof include kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP). In the case of chemical pulp made from wood, it may be a softwood pulp, a hardwood pulp, or a mixture thereof. Further, as the wood pulp, kraft pulp (KP) having a low content of an adhesive natural resin derived from wood is suitable. Moreover, as a chemical pulp which does not use wood as a raw material, the non-wood fiber pulp which uses a cocoon, a three base, hemp, kenaf etc. as a raw material is mentioned, for example.
　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。 Semi-chemical pulps such as semi-chemical pulp (SCP) and Chemi-Grandwood pulp (CGP); groundwood pulp (GP), thermomechanical pulp (TMP, BCTMP), refiner Grandwood pulp (RGP) And other mechanical pulps. The glass interleaving paper of this embodiment may be a mixture of one or more pulps other than chemical pulp.
　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。 Since waste paper pulp generally has a large amount of adhesive foreign matter, impurities, and resin, virgin pulp is preferable to waste paper pulp as a raw material for pulp.
　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ため、ガラス表面に傷が付きやすくなる。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。叩解度を２００～７００ｍｌｃｓｆに調製するために、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。 The beating degree of chemical pulp is preferably 200 to 700 mlcsf. Here, the beating degree is a Canadian standard freeness according to JIS P8121. By setting the beating degree of the chemical pulp in the range of 200 to 700 mlcsf, it is possible to have the mechanical strength and workability necessary for the slip sheet. When the beating degree of the chemical pulp is less than 200 mlcsf, the density of the interleaf is increased and the cushioning property is lowered, so that the glass surface is easily damaged. On the other hand, when the beating degree of the chemical pulp is higher than 700 mlcsf, the paper strength becomes weak, and thus there is a risk of breaking in the distribution process and the manufacturing process. More preferably, the beating degree of the chemical pulp is 350 to 600 mlcsf. A known method can be used as a method of beating the pulp in order to adjust the beating degree to 200 to 700 mlcsf.
（第２族元素）
　第２族元素とは、カルシウム、マグネシウム、バリウム、ベリリウム、ストロンチウム等の第２族の金属元素である。これらの中でも、合紙に含有される第２族元素として重要なものがカルシウムおよびマグネシウムの少なくとも一方である。カルシウムとマグネシウムの金属イオンの含有量が多い水を硬水といい、含有量が少ない水を軟水という。水の硬度は、水中に含まれるカルシウムとマグネシウムの金属イオンの量（ｍｇ／ｌ）によって表わされる。また、水の硬度の指標として、電気伝導率が用いられる。 (Group 2 elements)
The Group 2 element is a Group 2 metal element such as calcium, magnesium, barium, beryllium, or strontium. Among these, at least one of calcium and magnesium is important as the Group 2 element contained in the slip sheet. Water with a high content of calcium and magnesium metal ions is called hard water, and water with a low content is called soft water. The hardness of water is represented by the amount of calcium and magnesium metal ions (mg / l) contained in the water. In addition, electrical conductivity is used as an index of water hardness.
（ガラス板のヤケ）
　ガラス板のヤケとは、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によって引き起こされる。ガラス板のヤケが発生するメカニズムとしては次の２つのものが考えられる。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。 (Gake on the glass plate)
Discoloration of the glass plate is caused by an ion exchange reaction between sodium in the glass and hydrogen ions of water. The following two mechanisms are considered as the mechanism for generating the glass plate burn. When water droplets adhere to the surface of the glass plate, a small amount of sodium ions in the glass are dissolved in water, sodium hydroxide is generated on the surface of the glass plate, the glass plate surface is eroded and roughened, and the glass plate becomes cloudy. Also, when water droplets on the glass plate surface evaporate, sodium ions react with carbon dioxide in the air to produce sodium carbonate and sodium hydrogen carbonate, which adheres to the glass plate surface and makes the glass plate cloudy .
（ガラス合紙）
　合紙は主としてセルロースパルプからなるが、パルプはヘミセルロース成分中にカルボキシ基を有している。そして、パルプ中のカルボキシ基は、パルプ製造工程や抄紙工程で使用する用水中の第２族元素のイオン（カルシウムイオン、マグネシウムイオン等）と反応して塩を生じる。使用する水の硬度（電気伝導率）が低い場合は生成する塩が少なくなり、水の硬度が高い場合は生成する塩が多くなる。さらに、合紙中に第２族元素を添加することによって、更に多くの塩を生じさせることができる。 (Glass interleaving paper)
The interleaf paper mainly consists of cellulose pulp, but the pulp has a carboxy group in the hemicellulose component. And the carboxy group in a pulp reacts with the ion (calcium ion, magnesium ion, etc.) of the Group 2 element in the water used for a pulp manufacturing process or a papermaking process, and produces a salt. When the hardness (electric conductivity) of the water to be used is low, less salt is produced, and when the water hardness is high, more salt is produced. Furthermore, by adding a Group 2 element in the interleaving paper, more salt can be generated.
　本発明者は、合紙の製造時に、第２族元素の含有量が多い用水を使用した場合には、第２族元素の含有量が少ない用水を使用した場合と比べて一般に、ヤケが発生しにくい傾向があるということを見出した。合紙がヤケを起こす理由の明確な解明は今後の研究を待たなければならないが、パルプ中にカルボキシ基（－ＣＯＯＨ）が多い場合は、その遊離した水素イオンとガラス中のナトリウムイオンとのイオン交換量が多くなり、ヤケの発生量が多くなるものと推定される。しかし、合紙の製造時に使用する用水中の第２族元素との反応によって水素イオンと第２族元素イオンとの交換による塩を生じさせて、パルプ中のカルボキシ基（－ＣＯＯＨ）の遊離した水素イオン含有量を少なくした場合は、ヤケの発生量が少なくなるものと考えられる。 The present inventor generally used the use of water having a high Group 2 element content during the production of slip paper, as compared with the case of using water having a low Group 2 element content. I found out that it tends to be difficult to do. A clear elucidation of the reason why the interleaf paper causes burns has to wait for further research, but if there are many carboxy groups (-COOH) in the pulp, the ions of the liberated hydrogen ions and sodium ions in the glass It is estimated that the amount of exchange increases and the amount of burns increases. However, the reaction with the Group 2 element in the water used for the production of the slip paper produced a salt by exchanging hydrogen ions and Group 2 element ions, and liberated the carboxy group (—COOH) in the pulp. When the hydrogen ion content is reduced, the amount of burns generated is considered to be reduced.
　一方、合紙中の樹脂分は、樹脂酸（アビエチン酸）、脂肪酸（ステアリン酸、オレイン酸）等のカルボキシ基を有する化合物であり、パルプ懸濁液中では、コロイダルピッチとして存在している。合紙中に第２族元素が存在すると、第２族元素から生じた２価の陽イオンの電荷力によるパルプ繊維への定着作用によって、樹脂分（コロイダルピッチ）とパルプ繊維との結合力が増すと考えられる。その結果、樹脂分のガラス板への転移量が少なくなり、樹脂分のガラス板への付着（汚染）が低減すると考えられる。 On the other hand, the resin content in the slip sheet is a compound having a carboxy group such as resin acid (abietic acid) or fatty acid (stearic acid, oleic acid), and is present as a colloidal pitch in the pulp suspension. When a Group 2 element is present in the slip, the binding force between the resin component (colloidal pitch) and the pulp fiber is caused by the fixing action to the pulp fiber due to the charge force of the divalent cation generated from the Group 2 element. It is thought to increase. As a result, the transfer amount of the resin component to the glass plate is reduced, and the adhesion (contamination) of the resin component to the glass plate is considered to be reduced.
　また、樹脂分は、パルプのカルボキシ基と同様に、パルプ製造工程や抄紙工程で使用する用水中の第２族元素のイオンと反応して塩を生じる。樹脂酸や脂肪酸が塩になると水への溶解度が低くなり、融点は高くなる。さらに、脂肪酸や樹脂酸は、脂肪酸カルシウムや樹脂酸カルシウムなどの塩に変わると、粘着性が低減し、ガラス板との親和性が低下し、ガラス板への付着（汚染）が低減すると考えられる。 In addition, the resin component reacts with ions of Group 2 elements in the water used in the pulp production process and papermaking process, similarly to the carboxy group of the pulp, to generate a salt. If the resin acid or fatty acid is converted to a salt, the solubility in water decreases and the melting point increases. Furthermore, when fatty acid or resin acid is changed to a salt such as fatty acid calcium or resin acid calcium, the adhesiveness is reduced, the affinity with the glass plate is lowered, and the adhesion (contamination) to the glass plate is considered to be reduced. .
　本実施形態の合紙は、第２族元素の含有量が０．１～３．０質量％である。第２族元素の含有量が０．１質量％以上であると、パルプ中のカルボキシ基の遊離した水素イオンの含有量が少なくなり、ヤケの発生量を低減させることができる。また、樹脂分のガラス板への付着を低減させることができ、ひいてはガラス板表面の撥水性化を低減させることができる。一方、第２族元素の含有量が３．０質量％を超えると、第２族元素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。第２族元素の含有量は、より好ましくは０．１５～０．５質量％である。合紙中の第２族元素の含有量は、合紙の灰分量を測定し、更に、灰分中の第２族元素の含有量を蛍光Ｘ線分析によって測定することによって求めることができる。 In the slip sheet of this embodiment, the content of the Group 2 element is 0.1 to 3.0% by mass. When the content of the Group 2 element is 0.1% by mass or more, the content of hydrogen ions liberated from carboxy groups in the pulp decreases, and the amount of burns generated can be reduced. Moreover, the adhesion of the resin to the glass plate can be reduced, and consequently the water repellency of the glass plate surface can be reduced. On the other hand, when the content of the Group 2 element exceeds 3.0% by mass, there is a concern that the salt of the Group 2 element precipitates in the interleaf and contaminates the glass plate. The content of the Group 2 element is more preferably 0.15 to 0.5% by mass. The content of the Group 2 element in the slip paper can be determined by measuring the ash content of the slip paper, and further measuring the content of the Group 2 element in the ash content by fluorescent X-ray analysis.
　合紙中の第２族元素の含有量を０．１～３．０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、第２族元素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、化学パルプに第２族元素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 the Group 2 element in the interleaving paper to 0.1 to 3.0% by mass, the Group 2 element is added in at least one of the chemical pulp manufacturing process and the papermaking process. A method of adding a compound containing a Group 2 element to chemical pulp in at least one of a method of using water (first method), a chemical pulp manufacturing step, a papermaking step, and a post-papermaking step There is a (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第２族元素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第２族元素の含有量を調整することができる。第２族元素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。第２族元素を含有する水は、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第２族元素の金属イオンが溶解していると、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、第２族元素を内部に保持することができる。 In the first method, the group 2 in the interleaving paper finally obtained by appropriately controlling the content of the group 2 element in the water used in at least one of the chemical pulp manufacturing process and the papermaking process. The content of the element can be adjusted. The hardness of water containing a Group 2 element is preferably 70 to 500 (mg / l), more preferably 120 to 400 (mg / l). The electrical conductivity of water is preferably 14 to 100 mS / m, more preferably 24 to 33 mS / m. Water containing a Group 2 element may be used in both the chemical pulp production process and the papermaking process, or in any one of the processes. When the metal ions of the Group 2 element are dissolved in the water used for the chemical pulp manufacturing process or the papermaking process, the chemical pulp has a carboxy group contained therein to form a salt with the metal ions. Group elements can be retained inside.
　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第２族元素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つの工程で第２族元素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）、抄紙後の工程で第２族元素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。パルプの表層や内部、パルプスラリー中の樹脂分（コロイダルピッチ）に作用し易いという観点から、内添法や用水法が好ましい。 The second method includes a method of adding a compound containing a Group 2 element in the raw material in at least one of the chemical pulp manufacturing process and the papermaking process (internal addition method), the chemical pulp manufacturing process, and the papermaking process. A method of using water in which a compound containing a Group 2 element is dissolved and dispersed in at least one step of the above (water use method), and an aqueous solution in which a compound containing a Group 2 element is dissolved and dispersed in a step after papermaking There is a method of coating on the surface of the slip (coating method). From the viewpoint of being easy to act on the surface layer and inside of the pulp and the resin content (colloidal pitch) in the pulp slurry, the internal addition method and the water use method are preferable.
（炭酸カルシウム）
　第２の方法において、第２族元素を含有する化合物としては、炭酸カルシウムが好ましい。炭酸カルシウムは、各種の紙の填料として従来から使用されている添加剤である。炭酸カルシウムは、水に難溶であるため、大部分の炭酸カルシウムは固形分として紙に留めることができるが、一部は溶解する。水に対する溶解度は０．０００１５ｍｏｌ／Ｌ（２５℃）であり、カルシウムイオンを生じる。また、炭酸カルシウム水溶液は塩基性を示す。 (Calcium carbonate)
In the second method, the compound containing a Group 2 element is preferably calcium carbonate. Calcium carbonate is an additive conventionally used as a filler for various papers. Since calcium carbonate is hardly soluble in water, most of the calcium carbonate can be retained on paper as a solid content, but a part of it is dissolved. The solubility in water is 0.00015 mol / L (25 ° C.), which produces calcium ions. The calcium carbonate aqueous solution is basic.
　合紙に対する炭酸カルシウムの添加量としては０．１５～３．０質量％が好ましく、０．３～１．５質量％がより好ましい。炭酸カルシウムの添加量が３．０質量％を超えると、炭酸カルシウムの溶解度を超えて、合紙中に炭酸カルシウム粒子が保持されて、ガラス板を汚染する懸念がある。そのため、炭酸カルシウムの添加量は極力少ないことが好ましい。合紙中に析出する炭酸カルシウム粒子の含有量を低減させるには、炭酸カルシウム粒子が合紙中に保持されないようにするため、歩留向上剤を使用しないことが好ましい。炭酸カルシウムとしては、夾雑物が少ないという理由から、合成法による軽質炭酸カルシウムが好ましい。 The amount of calcium carbonate added to the interleaving paper is preferably 0.15 to 3.0% by mass, more preferably 0.3 to 1.5% by mass. If the added amount of calcium carbonate exceeds 3.0% by mass, the solubility of calcium carbonate is exceeded, and the calcium carbonate particles are retained in the slip sheet, and there is a concern of contaminating the glass plate. Therefore, it is preferable that the amount of calcium carbonate added is as small as possible. In order to reduce the content of calcium carbonate particles precipitated in the interleaf, it is preferable not to use a yield improver so that the calcium carbonate particles are not retained in the interleaf. As calcium carbonate, light calcium carbonate by a synthetic method is preferable because there are few impurities.
　以上説明してきたように、合紙中の第２族元素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抑制し、合紙中の樹脂分のガラス板への付着を低減させ、ガラス板表面の撥水性化を低減させることができる。 As described above, by regulating the content of the Group 2 element in the slip sheet, the occurrence of burns in the glass sheet is suppressed, and the adhesion of the resin content in the slip sheet to the glass sheet is reduced. The water repellency of the glass plate surface can be reduced.
（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。 (Paper making chemicals)
As the papermaking chemicals used when making the interleaf paper, various known chemicals can be used as long as they do not contaminate the glass surface. Examples of papermaking chemicals include paper strength enhancers such as polyacrylamide, water resistance agents such as polyamide polyamine epichlorohydrin, softeners, antistatic agents, antifoaming agents, slime control agents, fillers, and dyes. Any of these papermaking chemicals may contaminate the glass plate. Therefore, even when added, the total is preferably 0.1% by mass or less.
（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。合紙中の第２族元素の含有量を０．１～３．０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。 (Glass interleaving method)
There is no restriction | limiting in particular in the manufacturing method of interleaving paper, and it can be made by selecting appropriate paper making conditions using various paper machines. Specific examples of the paper machine include a long net former, a twin wire former, a circular net former, and an inclined former. The layer structure of the interleaving paper may be a single layer or a multilayer. As a method for controlling the content of the Group 2 element in the interleaf paper to 0.1 to 3.0% by mass, the first method or the second method described above 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３５～８０ｇ／ｍ２である。 (Characteristics of glass interleaving paper)
A smaller basis weight of the interleaving paper is preferable because the mass during transportation decreases, but if it is too small, sufficient buffering properties cannot be imparted to the glass plate. On the other hand, the basis weight of the interleaving paper is preferably large to some extent from the viewpoint of buffering properties, but if it is too large, the mass during transportation becomes large, which is not preferable. Considering the balance between buffer properties and ease of transport and usage, the basis weight of the interleaving paper is 10 to 300 g / m 2 . The more preferable basis weight of the interleaving paper is 35 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 interleaving paper is preferably 25 to 250 μm from the viewpoint of buffer properties 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、中性またはアルカリ性が好ましい。具体的には、合紙のｐＨは、６以上が好ましく、８以上がより好ましい。 The pH of the slip sheet (JIS P 8133-2) is preferably neutral or alkaline. Specifically, the pH of the slip sheet is preferably 6 or more, and more preferably 8 or more.
　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使用される。 The slip sheet of the present embodiment protects the glass substrate when a plurality of glass substrates for flat panel displays such as a touch panel glass substrate, a liquid crystal display, an organic electroluminescence display, and a plasma display are stacked and stored and transported. Used for.
　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 by way of examples, but the present invention is not limited thereto. In addition, the numerical value which shows a mixing | blending is a numerical value (mass%) of the mass reference | standard of solid content or an active ingredient. Further, unless otherwise specified, the paper made was processed according to JIS P8111 and then subjected to measurement and evaluation tests.
（実施例１～４、比較例１）
　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。
　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
　軽質炭酸カルシウム：奥多摩工業社製ＴＰ－１２１－５Ｓ (Examples 1 to 4, Comparative Example 1)
The materials used in Examples and Comparative Examples are as follows.
Softwood bleached kraft pulp (NBKP): Commercial softwood bleached kraft pulp Light calcium carbonate: TP-121-5S manufactured by Okutama Kogyo Co., Ltd.
　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。 The electrical conductivity of water was measured using a portable electrical 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、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５０ｇ／ｍ２のガラス合紙を得た。得られたガラス合紙の第２族元素含有量は０．２１％であり、ｐＨ（ＪＩＳ　Ｐ　８１３３－２）は６．６であった。 [Example 1]
As raw material pulp, commercially available NBKP (conifer bleach bleached kraft pulp) 100% virgin pulp slurry (beating degree 450ml csf) is used, water with electrical conductivity of 25mS / m is used, and paper mesh is not added. Paper was made with a paper machine. After making the paper, it was dried to obtain a glass interleaving paper having a basis weight of 50 g / m 2 . The obtained glass interleaving paper had a Group 2 element content of 0.21% and a pH (JIS P 8133-2) of 6.6.
［実施例２］
　軽質炭酸カルシウムを絶乾パルプに対して０．３質量％添加し、電気伝導率３ｍＳ/ｍの水を用いた以外は、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第２族元素含有量は、０．１７％であり、ｐＨ（ＪＩＳ　Ｐ　８１３３－２）は６．６であった。 [Example 2]
Glass interleaving paper was obtained in the same manner as in Example 1 except that 0.3% by mass of light calcium carbonate was added to the absolutely dry pulp and water having an electric conductivity of 3 mS / m was used. The obtained glass interleaving paper had a Group 2 element content of 0.17% and a pH (JIS P 8133-2) of 6.6.
［実施例３］
　軽質炭酸カルシウムの添加量を０．９質量％とした以外は、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第２族元素含有量は、０．２５％であり、ｐＨ（ＪＩＳ　Ｐ　８１３３－２）は９．３であった。 [Example 3]
Glass interleaving paper was obtained in the same manner as in Example 2 except that the addition amount of light calcium carbonate was changed to 0.9% by mass. The obtained glass interleaving paper had a Group 2 element content of 0.25% and a pH (JIS P 8133-2) of 9.3.
［実施例４］
　軽質炭酸カルシウムの添加量を３質量％とした以外は、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第２族元素含有量は、０．４１％であり、ｐＨ（ＪＩＳ　Ｐ　８１３３－２）は９．４であった。 [Example 4]
Glass interleaving paper was obtained in the same manner as in Example 2 except that the addition amount of light calcium carbonate was changed to 3% by mass. The obtained glass interleaving paper had a Group 2 element content of 0.41% and a pH (JIS P 8133-2) of 9.4.
［比較例１］
　軽質炭酸カルシ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第２族元素含有量は、０．０８％であり、ｐＨ（ＪＩＳ　Ｐ　８１３３－２）は６．５であった。 [Comparative Example 1]
A glass interleaving paper was obtained in the same manner as in Example 2 except that light calcium carbonate was not added. The obtained glass interleaving paper had a Group 2 element content of 0.08% and a pH (JIS P 8133-2) of 6.5.
（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。
＜合紙中の第２族元素の含有量＞
　ガラス合紙の灰分をＪＩＳ　Ｐ８２５１に準じて求めた。得られた灰分中の第２族元素の含有量（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。ガラス合紙中の第２族元素含有量ｍ（質量％）を次式（１）によって求めた。
　　　ｍ＝ａ×ｂ・・・（１）
　　　ここで、ｍ：第２族元素含有量（質量％）
　　　　　　　ａ：ガラス合紙の灰分（質量％）
　　　　　　　ｂ：灰分中の第２族元素含有量（質量％） (Evaluation content)
The evaluation contents of the obtained glass slip sheet are as follows.
<Content of Group 2 element in interleaving paper>
The ash content of the glass interleaving paper was determined according to JIS P8251. The content (mass%) of the Group 2 element 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 group 2 element content m (mass%) in the glass interleaving paper was calculated | required by following Formula (1).
m = a × b (1)
Here, m: Group 2 element content (mass%)
a: Ash content of glass slip (% by mass)
b: Group 2 element content in ash (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、乾燥した後、ガラス板表面に息を吐いたときに生じるしわ状の曇りの程度を観察した（ｎ＝３）。ガラス板のヤケの評価を以下の基準で行った。○と△を合格と判定した。
　　○：曇りがない
　　△：曇りが少しあるが、使用可能なレベルである
　　×：曇りがある <Evaluation of discoloration of 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 laminated alternately, a pressure of 1 kg is placed thereon, a temperature of 50 ° C. and a humidity of 90% RH is applied. The sample was allowed to stand in the environment for 4 days. After the surface of the glass plate was washed with water and dried, the degree of wrinkled cloudiness generated when exhaling the surface of the glass plate was observed (n = 3). Evaluation of scorching of the glass plate was performed according to the following criteria. ○ and △ were determined to be acceptable.
○: There is no cloudiness △: There is a little cloudiness, but it is a usable level ×: There is cloudiness
＜ガラス板の撥水性の評価＞
　２１０ｍｍ×２１０ｍｍガラス合紙に２００ｍｍ×２００ｍｍのフラットパネルディスプレイ用ガラス板を載せ、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、乾燥した後、ガラス板表面に脱イオン水をかけ、撥水性の程度を観察した（ｎ＝３）。ガラス板の撥水性の評価を以下の基準で行った。
　　○：撥水なく優れる
　　×：撥水が見られ劣る <Evaluation of water repellency of glass plate>
A glass plate for a flat panel display of 200 mm × 200 mm is placed on a 210 mm × 210 mm glass interleaving paper, three sets of the combinations are laminated alternately, a 1 kg weight is placed thereon, a pressure is applied, a temperature of 50 ° C., and a humidity of 90%. The sample was left to stand in an RH environment for 4 days. After the surface of the glass plate was washed with water and dried, deionized water was applied to the surface of the glass plate, and the degree of water repellency was observed (n = 3). The water repellency of the glass plate was evaluated according to the following criteria.
○: Excellent without water repellency ×: Inferior due to water repellency
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に、実施例１～４および比較例１の評価結果を示した。実施例１～４のガラス合紙は、ガラス板のヤケと撥水性に優れていた。特に、第２族元素の含有量が０．１７～０．２５質量％の実施例１～３は、ガラス板のヤケにおいてさらに優れたものであった。一方、比較例１のガラス合紙は、ガラス板のヤケおよび撥水性が劣っていた。 Table 1 shows the evaluation results of Examples 1 to 4 and Comparative Example 1. The glass interleaving papers of Examples 1 to 4 were excellent in the burning and water repellency of the glass plate. In particular, Examples 1 to 3 in which the content of the Group 2 element was 0.17 to 0.25% by mass were more excellent in the burnt of the glass plate. On the other hand, the glass interleaving paper of Comparative Example 1 was inferior in the burning and water repellency of the glass plate.

Claims (5)

  1. 　化学パルプを主成分とし、第２族元素の含有量が０．１～３．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙。 Glass interleaving paper comprising chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2 .
  2. 　前記第２族元素がカルシウムおよびマグネシウムの少なくとも一方である請求項１に記載のガラス合紙。 The glass interleaving paper according to claim 1, wherein the Group 2 element is at least one of calcium and magnesium.
  3. 　化学パルプを主成分とし、第２族元素の含有量が０．１～３．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙の製造方法であって、
    　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、前記第２族元素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。     A method for producing glass interleaving paper comprising a chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2 ,
    A method for producing glass interleaving paper, wherein water containing the Group 2 element is used in at least one of the chemical pulp production process and the papermaking process.
  4. 　化学パルプを主成分とし、第２族元素の含有量が０．１～３．０質量％であり、坪量が１０～３００ｇ／ｍ２であるガラス合紙の製造方法であって、
    　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、前記化学パルプに前記第２族元素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。     A method for producing glass interleaving paper comprising a chemical pulp as a main component, a Group 2 element content of 0.1 to 3.0% by mass, and a basis weight of 10 to 300 g / m 2 ,
    A method for producing glass interleaving paper, wherein a compound containing the Group 2 element is added to the chemical pulp in at least one of the chemical pulp production process, the papermaking process, and the post-papermaking process.
  5. 　前記第２族元素を含有する化合物が炭酸カルシウムであることを特徴とする請求項４に記載のガラス合紙の製造方法。 The method for producing glass interleaving paper according to claim 4, wherein the compound containing the Group 2 element is calcium carbonate.
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CN114108380A (en) * 2020-08-31 2022-03-01 Ａｇｃ株式会社 Paper clip for glass plate
WO2022209669A1 (en) * 2021-03-29 2022-10-06 特種東海製紙株式会社 Spacer paper for glass plate
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CN114108380A (en) * 2020-08-31 2022-03-01 Ａｇｃ株式会社 Paper clip for glass plate
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JP7640447B2 (en) 2021-12-27 2025-03-05 北越コーポレーション株式会社 Interleaving paper for soda glass plates and its manufacturing method

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