JP7366568B2 - Moisture-proof paper and its manufacturing method - Google Patents
Moisture-proof paper and its manufacturing method Download PDFInfo
- Publication number
- JP7366568B2 JP7366568B2 JP2019066898A JP2019066898A JP7366568B2 JP 7366568 B2 JP7366568 B2 JP 7366568B2 JP 2019066898 A JP2019066898 A JP 2019066898A JP 2019066898 A JP2019066898 A JP 2019066898A JP 7366568 B2 JP7366568 B2 JP 7366568B2
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- Prior art keywords
- paper
- moisture
- coating layer
- coating
- proof
- Prior art date
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- Paper (AREA)
Description
本発明は、防湿性紙に係り、特に防水性を兼ね備え、且つ、美粧性を有する防湿性紙およびその製造方法に関する。 The present invention relates to moisture-proof paper, and more particularly to moisture-proof paper that is both waterproof and cosmetic, and a method for producing the same.
従来から、種々の物品を包装するために、紙基材を用いた種々の形態からなる紙製容器や梱包材等が使用されている。一般に、紙製の容器や梱包材は、紙基材をベース素材とすることから、水蒸気等の透過が極めて容易であり、包装している物品から発生する湿気による強度低下を来すことがある。また、包装、梱包の対象となる物品によっては、外部から侵入する水蒸気等を著しく嫌うものがある。更に、チルド製品等のように氷を一緒に入れて輸送する場合、紙製の容器や梱包材が防水性を具備する必要がある。 2. Description of the Related Art Conventionally, paper containers, packaging materials, and the like made of paper base materials in various forms have been used to package various articles. In general, paper containers and packaging materials are based on paper, so water vapor can permeate through them extremely easily, and moisture generated from the packaged item can cause a decrease in strength. . Furthermore, some items to be packaged or packaged are extremely sensitive to water vapor or the like entering from the outside. Furthermore, when transporting chilled products with ice, the paper containers and packaging materials need to be waterproof.
このため、紙基材の表面に、撥水性を有するワックス組成物を塗工してワックス層を形成する方法、ポリエチレンフィルム、ポリプロピレンフィルム等をラミネートして樹脂被膜を形成する方法が提案されている。 For this reason, a method of forming a wax layer by coating the surface of a paper base material with a water-repellent wax composition, and a method of forming a resin film by laminating polyethylene film, polypropylene film, etc. have been proposed. .
また、紙の少なくとも片面に、ワックスエマルジョンおよび水不溶性合成樹脂エマルジョンと共に界面活性剤を加えた混合液を塗布した後、加熱処理を施して、最外層に界面活性剤の層を形成した防湿紙（特許文献１）が知られている。更に、基紙の少なくとも片面に、少なくとも２層の塗工層を有し、最表面に位置する塗工層はワックスを封入したマイクロカプセルを含有し、塗工量が固形分換算０．５ｇ／ｍ２以上２．５ｇ／ｍ２以下であり、この最表面の塗工層と基紙との間に位置する塗工層はアクリル系共重合体および／またはスチレン系共重合体を含有する防湿ライナー（特許文献２）が知られている。 In addition, a moisture-proof paper (with a surfactant layer formed on the outermost layer by applying a mixture of a wax emulsion, a water-insoluble synthetic resin emulsion, and a surfactant to at least one side of the paper, and then applying a heat treatment to the paper) Patent Document 1) is known. Furthermore, at least one side of the base paper has at least two coating layers, and the coating layer located on the outermost surface contains microcapsules encapsulating wax, and the coating amount is 0.5 g/solid content. m 2 or more and 2.5 g/m 2 or less, and the coating layer located between this outermost coating layer and the base paper is a moisture-proof coating containing an acrylic copolymer and/or a styrene copolymer. A liner (Patent Document 2) is known.
しかし、ワックス層を形成する方法では、単にワックス組成物を１層塗工しても、透湿度を十分に抑制することは困難であり、透湿度を十分に抑制するためにはワックス組成物を多数回塗工することが必要となるが、その場合は工程が著しく煩雑なものとなる。また、樹脂被膜を形成する方法では、ラミネート加工が必要で工程が煩雑となり、更に、樹脂被膜を形成した紙または板紙は、使用後に古紙として回収使用する際の離解性が著しく悪く、再利用化が困難である。 However, with the method of forming a wax layer, it is difficult to sufficiently suppress moisture permeability even if a single layer of wax composition is applied. It is necessary to apply the coating multiple times, but in that case, the process becomes extremely complicated. In addition, the method of forming a resin film requires lamination, which makes the process complicated. Furthermore, the paper or paperboard on which the resin film has been formed has extremely poor disintegration properties when collected and used as waste paper after use, making it difficult to recycle. is difficult.
また、最外層に界面活性剤の層を形成した防湿紙や、少なくとも２層の塗工層を有する防湿ライナは、防湿性は良好であるものの、防水性を兼ね備えるものではないため、例えば、チルド製品等のように氷を入れて輸送する容器、梱包材としての使用は困難である。 In addition, moisture-proof paper with a surfactant layer formed on the outermost layer or moisture-proof liner with at least two coated layers have good moisture-proof properties, but do not have waterproof properties. It is difficult to use it as a container or packaging material for transporting ice products, etc.
更に、従来のように、基紙の表面に塗工層を設けることにより防湿性を付与した紙または板紙では、白色度を高めて美粧性を向上させるために、塗工剤に顔料を含有することが行われていた。しかし、塗工剤に顔料を含有させた場合、塗工剤の機能が十分に発揮されず、このため塗工層を厚くして防湿性を高めることが必要となる結果、製造コストの増大を招くという問題があった。 Furthermore, in paper or paperboard that has been made moisture-proof by providing a coating layer on the surface of the base paper, as in the past, pigments are contained in the coating agent in order to increase whiteness and improve cosmetic properties. things were being done. However, when the coating agent contains pigments, the functions of the coating agent are not fully demonstrated, and as a result, it is necessary to increase the moisture resistance by thickening the coating layer, resulting in an increase in manufacturing costs. There was the problem of inviting.
本発明はこのような事情に鑑みてなされたもので、防湿性と防水性を兼ね備え、且つ、美粧性に優れた防湿性紙およびその製造方法を提供することを課題とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a moisture-proof paper that has both moisture-proof and waterproof properties and has excellent cosmetic properties, and a method for producing the same.
即ち、上記課題を解決するための請求項１に係る発明は、古紙パルプ配合率が１０質量％以上である紙基材と、該紙基材の少なくとも一方の面に位置する塗工層と、を備え、透湿度が５０ｇ／ｍ２・２４ｈ以下であり、前記塗工層は合成樹脂およびワックスを含有し、前記塗工層表面の白色度が２０％以上であり、前記塗工層表面の１２０秒コッブ吸水度が１ｇ／ｍ２以下であり、前記塗工層表面の平滑度が４０秒以上であり、前記塗工層の塗工量は２０ｇ／ｍ ２ 以下であることを特徴とする防湿性紙である。 That is, the invention according to claim 1 for solving the above problem comprises: a paper base material having a waste paper pulp content ratio of 10% by mass or more; a coating layer located on at least one surface of the paper base material; , the moisture permeability is 50 g/m 2 ·24 h or less, the coating layer contains a synthetic resin and wax, the whiteness of the coating layer surface is 20% or more, and the coating layer surface has a The 120 second Cobb water absorption is 1 g/ m2 or less, the surface smoothness of the coating layer is 40 seconds or more , and the coating amount of the coating layer is 20 g/m2 or less . It is a moisture-proof paper.
一実施形態においては、前記塗工層は、顔料を含有する。また、前記顔料は、少なくとも無機顔料を含むものである。また、前記紙基材の坪量は、１０ｇ／ｍ２以上、７５０ｇ／ｍ２以下である。 In one embodiment, the coating layer contains a pigment. Further, the pigment includes at least an inorganic pigment . Moreover , the basis weight of the paper base material is 10 g/m 2 or more and 750 g/m 2 or less.
また、上記課題を解決するための請求項５に係る発明は、紙基材と、該紙基材の少なくとも一方の面に位置する塗工層と、を備え、透湿度が５０ｇ／ｍ２・２４ｈ以下であり、前記塗工層表面の白色度が２０％以上であり、前記塗工層表面の１２０秒コッブ吸水度が１ｇ／ｍ２以下であり、前記塗工層表面の平滑度が４０秒以上である防湿性紙の製造方法であって、古紙パルプ配合率が１０質量％以上である前記紙基材の少なくとも一方の面に、合成樹脂およびワックスを含有する塗工剤を塗工量が２０ｇ／ｍ ２ 以下となるようにブレード塗工方式により塗工し、塗工された前記塗工剤を乾燥して前記塗工層とすることを特徴とする防湿性紙の製造方法である。 Further, the invention according to claim 5 for solving the above problem includes a paper base material and a coating layer located on at least one surface of the paper base material, and has a moisture permeability of 50 g/m 2 · 24 hours or less, the whiteness of the surface of the coating layer is 20% or more, the 120 second Cobb water absorption of the surface of the coating layer is 1 g/m 2 or less, and the smoothness of the surface of the coating layer is 40%. A method for producing moisture-proof paper having a moisture-proofing time of 10% or more, wherein a coating amount of a coating agent containing a synthetic resin and a wax is applied to at least one surface of the paper base material having a content of waste paper pulp of 10% by mass or more. 20 g/m 2 or less using a blade coating method, and drying the applied coating agent to form the coating layer. .
本発明に係る防湿性紙は上記のとおりのものであって、防湿性と共に防水性を備えており、これにより、湿気や水分と接触する用途において強度低下が抑制されると共に、塗工層面の美粧性が優れるという効果がある。また、本発明に係る防湿性紙の製造方法は上記のとおりのものであって、防湿性と共に防水性を備え、美粧性に優れた防湿性紙の製造が可能である。 The moisture-proof paper according to the present invention is as described above, and has moisture-proof properties as well as waterproof properties.This suppresses a decrease in strength in applications where it comes into contact with moisture or moisture, and also suppresses the decrease in strength of the coated layer surface. It has the effect of having excellent cosmetic properties. Furthermore, the method for producing moisture-proof paper according to the present invention is as described above, and it is possible to produce moisture-proof paper that is both moisture-proof and waterproof and has excellent cosmetic properties.
[防湿性紙]
本発明に係る防湿性紙は、紙基材と、該紙基材の少なくとも一方の面に位置する塗工層と、を備え、透湿度が５０ｇ／ｍ２・２４ｈ以下、好ましくは２０ｇ／ｍ２・２４ｈ以下、より好ましくは１０ｇ／ｍ２・２４ｈ以下であり、塗工層は合成樹脂およびワックスを含有し、塗工層表面の白色度が２０％以上、より好ましくは３０％以上、より好ましくは４５％以上、更に好ましくは５５％以上である。
[Moisture-proof paper]
The moisture-proof paper according to the present invention includes a paper base material and a coating layer located on at least one surface of the paper base material, and has a moisture permeability of 50 g/m 2 ·24 h or less, preferably 20 g/m 2.24 h or less, more preferably 10 g/m 2.24 h or less, the coating layer contains synthetic resin and wax, and the whiteness of the coating layer surface is 20% or more, more preferably 30% or more, more Preferably it is 45% or more, more preferably 55% or more.
本発明に係る防湿性紙は、このように透湿度が５０ｇ／ｍ２・２４ｈ以下であることにより、優れた防湿性を具備するものである。更に、本発明の防湿性紙は、優れた防水性も具備するものである。 The moisture-proof paper according to the present invention has an excellent moisture-proof property because the moisture permeability is 50 g/m 2 ·24 h or less. Furthermore, the moisture-proof paper of the present invention also has excellent waterproof properties.
ここで、防湿性紙の透湿度は、ＪＩＳ Ｚ ０２０８に準拠して防湿性紙の塗工層側から測定した値である。また、防湿性紙の防水性とは、防湿性紙を用いて容器を作製し、当該容器に水を入れて３週間放置しても水の染み出しが発生せず、容器の形状が変形しない、あるいは、若干変形はみられるが容器形状が維持されていることを意味する。 Here, the moisture permeability of the moisture-proof paper is a value measured from the coating layer side of the moisture-proof paper in accordance with JIS Z 0208. In addition, the waterproofness of moisture-proof paper means that even if a container is made using moisture-proof paper, water is poured into the container, and the container is left for three weeks, the water will not seep out and the shape of the container will not change. Or, it means that the container shape is maintained although there is some deformation.
また、白色度は、ＪＩＳ Ｐ８１４８に準拠して、（株）村上色彩技術研究所製 ＩＳＯ白色度対応光測色システムＣＭＳ－３５ＳＰＸＭにて測定した値である。 In addition, the whiteness is a value measured in accordance with JIS P8148 using an optical colorimetry system CMS-35SPXM compatible with ISO whiteness manufactured by Murakami Color Research Institute Co., Ltd.
＜紙基材＞
本発明の防湿性紙を構成する紙基材は、防湿性紙の用途に応じて最適な坪量のものを使用することができる。紙基材が単層紙である場合、その坪量の下限は１０ｇ／ｍ２以上、上限は２５０ｇ／ｍ２以下の範囲で適宜設定することができ、例えば、紙基材がクラフト紙の場合、坪量の下限は３０ｇ／ｍ２以上、上限は２５０ｇ／ｍ２以下の範囲で設定することができる。また、紙基材が２層以上の紙層を有する多層抄き板紙である場合、その坪量の下限は１００ｇ／ｍ２以上、上限は７５０ｇ／ｍ２以下の範囲で適宜設定することができ、例えば、段ボールのライナの場合、坪量の下限は１００ｇ／ｍ２以上、上限は５５０ｇ／ｍ２以下の範囲で設定することができる。
<Paper base material>
The paper base material constituting the moisture-proof paper of the present invention can have an optimum basis weight depending on the use of the moisture-proof paper. When the paper base material is single-layer paper, the lower limit of the basis weight can be set appropriately in the range of 10 g/m 2 or more and the upper limit 250 g/m 2 or less. For example, when the paper base material is kraft paper The lower limit of the basis weight can be set in a range of 30 g/m 2 or more, and the upper limit can be set in a range of 250 g/m 2 or less. In addition, when the paper base material is a multilayer paperboard having two or more paper layers, the lower limit of the basis weight can be set as appropriate within the range of 100 g/ m2 or more and the upper limit of 750 g/ m2 or less. For example, in the case of a corrugated liner, the lower limit of the basis weight can be set in a range of 100 g/m 2 or more, and the upper limit can be set in a range of 550 g/m 2 or less.
また、紙基材の物性は、防湿性紙の用途に応じて適宜設定することができ、例えば、縦伸びの下限が１．０％以上、上限が１５．０％以下、横伸びの下限が２．０％以上、上限が１２．０％以下の範囲内、比圧縮強さの下限が１００Ｎ・ｍ２／ｇ以上、上限が３５０Ｎ・ｍ２／ｇ以下の範囲内となるように設定することができる。 In addition, the physical properties of the paper base material can be set as appropriate depending on the use of the moisture-proof paper. For example, the lower limit of longitudinal elongation is 1.0% or more, the upper limit is 15.0% or less, and the lower limit of horizontal elongation is Set the specific compressive strength so that the lower limit is 100 N・m 2 /g or more and the upper limit is 350 N・m 2 /g or less. be able to.
このような紙基材の原料パルプとしては、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹未晒クラフトパルプ（ＮＵＫＰ）、広葉樹未晒クラフトパルプ（ＬＵＫＰ）、砕木パルプ（ＧＰ）、リファイナーグラウンドパルプ（ＲＧＰ）、ケミカルパルプ（ＣＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）等の木材繊維由来の各種パルプ、ケナフ、バガス、竹、麻、ワラなどから得られた非木材パルプを挙げることができる。 Raw material pulps for such paper base materials include bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP), unbleached softwood kraft pulp (NUKP), unbleached hardwood kraft pulp (LUKP), and groundwood pulp (GP). ), various pulps derived from wood fibers such as refined ground pulp (RGP), chemical pulp (CP), thermomechanical pulp (TMP), and chemi-thermomechanical pulp (CTMP), kenaf, bagasse, bamboo, hemp, straw, etc. Non-wood pulps produced by wood can be mentioned.
紙基材は、古紙パルプを含有するものであってもよく、また、古紙パルプを含有しないものであってもよい。古紙パルプを含有する場合であって、例えば、紙基材が単層紙である場合、好ましくは全パルプに占める古紙パルプの配合率は１０質量％以上、より好ましくは２５質量％以上、更に好ましくは５０質量％以上、最も好ましくは７０質量％以上とすることができ、また、１００質量％（古紙由来のパルプのみからなる）とすることができる。また、古紙パルプ以外のパルプとしてクラフトパルプを配合してもよく、全量クラフトパルプとしてもよい。更に、紙基材が２層以上の紙層を有する多層抄き板紙である場合、１層あたりの古紙パルプ配合率を上記の通りとすることができ、各層における古紙パルプ配合率が異なるものであってもよい。 The paper base material may contain waste paper pulp or may not contain waste paper pulp. When containing waste paper pulp, for example, when the paper base material is single-layer paper, the proportion of waste paper pulp in the total pulp is preferably 10% by mass or more, more preferably 25% by mass or more, and even more preferably can be 50% by mass or more, most preferably 70% by mass or more, and can be 100% by mass (consisting only of pulp derived from waste paper). Further, kraft pulp may be blended as a pulp other than waste paper pulp, and the entire amount may be kraft pulp. Furthermore, if the paper base material is a multilayer paperboard having two or more paper layers, the content ratio of waste paper pulp per layer can be as described above, and the content ratio of waste paper pulp in each layer may be different. There may be.
古紙パルプとしては、段ボール古紙、上白、特白、中白、白損等の未印刷古紙を離解した古紙パルプ、上質紙、上質コート紙、中質紙、中質コート紙、更紙等に印刷された古紙、および、筆記された古紙、廃棄機密文書等の紙類、雑誌古紙、新聞古紙を離解後脱墨したパルプ（ＤＩＰ）等を使用することができる。 Waste paper pulp includes waste paper pulp obtained by disintegrating unprinted waste paper such as corrugated cardboard, white paper, special white paper, middle white paper, white loss, etc., wood-free paper, wood-free coated paper, medium-quality paper, medium-quality coated paper, and recycled paper. It is possible to use pulp (DIP) obtained by disintegrating and deinking printed waste paper, used paper with written notes, paper such as discarded confidential documents, used magazine paper, and used newspaper paper.
＜塗工層＞
本発明の防湿性紙を構成する塗工層は、上記のように、合成樹脂およびワックスを含有し、塗工層表面の白色度が２０％以上、より好ましくは３０％以上、より好ましくは４５％以上、更に好ましくは５５％以上である。
<Coating layer>
As mentioned above, the coating layer constituting the moisture-proof paper of the present invention contains a synthetic resin and wax, and the whiteness of the coating layer surface is 20% or more, more preferably 30% or more, and more preferably 45% or more. % or more, more preferably 55% or more.
塗工層の表面の白色度が２０％未満であると、防湿性紙の塗工層面の白色度が不十分であり、防湿性紙の美粧性が低下し、防湿性、防水性と共に美粧性が要求される用途への防湿性紙の使用が難しくなる。 If the whiteness of the surface of the coating layer is less than 20%, the whiteness of the coating layer surface of the moisture-proof paper will be insufficient, and the cosmetic properties of the moisture-proof paper will decrease, resulting in poor cosmetic properties as well as moisture-proof and waterproof properties. This makes it difficult to use moisture-proof paper in applications that require
本発明では、白色度を向上させることを目的として、塗工層に顔料を含有させてもよい。この場合、顔料を含有させることで塗工層の表面の白色度が、紙基材の白色度と比較して１％以上高くなっていることが好ましい。このような顔料としては、炭酸カルシウム、酸化チタン、カオリン、クレー、エンジニアードカオリン、デラミネーティッドクレー、タルク、硫酸バリウム、硫酸カルシウム、酸化亜鉛、珪酸、珪酸塩、コロイダルシリカ、サチンホワイト、マイカ、モンモリトナイト等の無機顔料を挙げることができ、これらの顔料を１種単独、あるいは、２種以上の組み合わせで使用することができる。これらの顔料の中で、特に、塗工層の防湿性、防水性を阻害し難い点で、粒子が扁平な形状であるカオリンや炭酸カルシウムもしくはマイカが好適である。このような扁平形状の無機顔料は、アスペクト比が１０以上であることが好ましい。塗工層における顔料の含有量は、５質量％以上、４０質量％以下、好ましくは１０質量％以上、３５質量％以下とすることができる。顔料の含有量が５質量％未満であると、白色度の向上効果が十分に得られず、４０質量％を超えると、合成樹脂成分が有する塗工層の防湿性、防水性の機能が十分発揮できないことがあるので好ましくない。 In the present invention, the coating layer may contain a pigment for the purpose of improving whiteness. In this case, it is preferable that the whiteness of the surface of the coating layer is 1% or more higher than the whiteness of the paper base material by containing the pigment. Such pigments include calcium carbonate, titanium oxide, kaolin, clay, engineered kaolin, delaminated clay, talc, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, colloidal silica, satin white, mica, Examples include inorganic pigments such as montmorillonite, and these pigments can be used singly or in combination of two or more. Among these pigments, kaolin, calcium carbonate, or mica, which have flat particles, are particularly preferred because they do not easily impede the moisture-proofing and waterproofing properties of the coating layer. It is preferable that such a flat-shaped inorganic pigment has an aspect ratio of 10 or more. The pigment content in the coating layer can be 5% by mass or more and 40% by mass or less, preferably 10% by mass or more and 35% by mass or less. If the pigment content is less than 5% by mass, the effect of improving whiteness cannot be sufficiently obtained, and if it exceeds 40% by mass, the moisture-proof and waterproof functions of the coating layer possessed by the synthetic resin component will not be sufficient. This is not desirable because it may not be able to perform to its full potential.
塗工層が含有する合成樹脂としては、スチレン系樹脂、アクリル系樹脂、ブタジエン系樹脂、ポリオレフィン系樹脂、ポリビニルアルコール樹脂、ポリ乳酸樹脂、ポリエステル系樹脂、ポリエチレン系樹脂等を挙げることができる。これらの合成樹脂は、１種単独、あるいは、２種以上の組み合わせで使用することができ、特に、合成樹脂がスチレン系樹脂および／またはアクリル系樹脂であることが好適である。 Examples of the synthetic resin contained in the coating layer include styrene resin, acrylic resin, butadiene resin, polyolefin resin, polyvinyl alcohol resin, polylactic acid resin, polyester resin, and polyethylene resin. These synthetic resins can be used alone or in combination of two or more, and it is particularly preferable that the synthetic resin is a styrene resin and/or an acrylic resin.
（スチレン系樹脂）
本発明を構成する塗工層が含有することのできるスチレン系樹脂とは、構造中にスチレン骨格を有するスチレン系単量体の共重合割合が５０質量％以上である樹脂であり、スチレン系単量体の重合体のみからなるものであってもよい。
(Styrene resin)
The styrenic resin that can be contained in the coating layer constituting the present invention is a resin in which the copolymerization ratio of a styrene monomer having a styrene skeleton in its structure is 50% by mass or more, and It may be composed only of a polymer of 1-mer.
スチレン系単量体としては、例えば、スチレン、ｏ－メチルスチレン、ｍ－メチルスチレン、ｐ－メチルスチレン、２，４－ジメチルスチレン、エチルスチレン、ｐ－ｔｅｒｔ－ブチルスチレン、α－メチルスチレン、α－メチル－ｐ－メチルスチレン等があげられる。 Examples of styrenic monomers include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, α-methylstyrene, α -Methyl-p-methylstyrene and the like.
また、スチレン単量体と共重合可能な単量体としては、例えば、メチルメタクリレート、シクロヘキシルメタクリレート、メチルフェニルメタクリレート等のアルキルメタクリレート、メチルアクリレート、エチルアクリレート、ブチルアクリレート、シクロヘキシルアクリレート等のアルキルアクリレート、メタクリル酸、アクリル酸等の不飽和カルボン酸、マレイン酸、イタコン酸等の無水物である不飽和ジカルボン酸無水物、アクリロニトリル、メタクリロニトリル等の不飽和ニトリル、１，３－ブタジエン、２－メチル－１，３－ブタジエン等の共役ジエン等が挙げられる。これらは１種単独、あるいは、２種以上の組み合わせで用いることができる。 Examples of monomers copolymerizable with the styrene monomer include alkyl methacrylates such as methyl methacrylate, cyclohexyl methacrylate, and methylphenyl methacrylate; alkyl acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, and cyclohexyl acrylate; acids, unsaturated carboxylic acids such as acrylic acid, unsaturated dicarboxylic anhydrides such as maleic acid and itaconic acid, unsaturated nitriles such as acrylonitrile and methacrylonitrile, 1,3-butadiene, 2-methyl- Examples include conjugated dienes such as 1,3-butadiene. These can be used alone or in combination of two or more.
（アクリル系樹脂）
本発明を構成する塗工層が含有することのできるアクリル系樹脂とは、アクリル酸、メタクリル酸及びこれらの誘導体であるアクリル系単量体の共重合割合が５０質量％以上である樹脂であり、アクリル系単量体の重合体のみからなるものであってもよい。
(acrylic resin)
The acrylic resin that can be contained in the coating layer constituting the present invention is a resin in which the copolymerization ratio of acrylic monomers such as acrylic acid, methacrylic acid, and derivatives thereof is 50% by mass or more. , it may be composed only of a polymer of acrylic monomers.
アクリル系単量体としては、例えば、メタクリル酸シクロヘキシル、メタクリル酸ｔ－ブチルシクロヘキシル、メタクリル酸メチル等のメタクリル酸エステル、アクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸イソプロピル等のアクリル酸エステル等を挙げることができ、アクリル系樹脂は、これらのアクリル系単量体から選ばれる１種以上の単量体を重合したものであってよい。 Examples of the acrylic monomer include methacrylic acid esters such as cyclohexyl methacrylate, t-butylcyclohexyl methacrylate, and methyl methacrylate; acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and isopropyl acrylate; The acrylic resin may be one obtained by polymerizing one or more monomers selected from these acrylic monomers.
また、アクリル系単量体と共重合可能な単量体としては、スチレン、ｏ－メチルスチレン、ｐ－メチルスチレン、２，４－ジメチルスチレン、エチルスチレン、ｐ－ｔｅｒｔ－ブチルスチレン、α－メチルスチレン、α－メチル－ｐ－メチルスチレン等の芳香族ビニル化合物、アクリロニトリル、メタクリロニトリル等の不飽和ニトリル、Ｎ－フェニルマレイミド、Ｎ－シクロヘキシルマレイミド等のマレイミド、無水マレイン酸等の不飽和ジカルボン酸無水物、メタクリル酸、アクリル酸等の不飽和カルボン酸等が挙げられる。これらは１種単独、あるいは、２種以上の組み合わせで用いることができる。 Monomers copolymerizable with acrylic monomers include styrene, o-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, α-methylstyrene, Aromatic vinyl compounds such as styrene and α-methyl-p-methylstyrene, unsaturated nitrites such as acrylonitrile and methacrylonitrile, maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide, and unsaturated dicarboxylic acids such as maleic anhydride. Examples include anhydrides, unsaturated carboxylic acids such as methacrylic acid, and acrylic acid. These can be used alone or in combination of two or more.
（ワックス）
塗工層が含有するワックスとしては、例えば、ポリエチレン系ワックス、フィッシャートロプシュワックス、油脂系合成ワックス（脂肪酸エステル系、脂肪酸アミド、ケトン・アミン類）、水素硬化油等の合成ワックス、蜜蝋、木蝋、パラフィン系ワックス、マイクロクリスタリンワックス等の天然ワックス等を挙げることができる。これらのワックスは、１種単独、あるいは、２種以上の組み合わせで使用することができ、特に、パラフィンを含む炭化水素系ワックスが好適である。
(wax)
The waxes contained in the coating layer include, for example, polyethylene wax, Fischer-Tropsch wax, oil-based synthetic waxes (fatty acid esters, fatty acid amides, ketones/amines), synthetic waxes such as hydrogenated oils, beeswax, Japanese wax, Examples include natural waxes such as paraffin wax and microcrystalline wax. These waxes can be used alone or in combination of two or more, and hydrocarbon waxes containing paraffin are particularly preferred.
本発明の防湿性紙の塗工層は、上記のような合成樹脂とワックスと、必要に応じて顔料を含有する塗工剤をブレード塗工方式により塗工して乾燥することにより形成することができる。塗工剤の塗工量は、２０ｇ／ｍ２以下とすることが好ましく、２０ｇ／ｍ２を超えると、防湿性紙の防湿性と防水性の更なる向上は望めない一方で、製造コストの増大を来すことになる。 The coating layer of the moisture-proof paper of the present invention is formed by applying a coating agent containing the above-mentioned synthetic resin and wax and, if necessary, a pigment using a blade coating method and drying the coating layer. I can do it. The coating amount of the coating agent is preferably 20 g/m 2 or less; if it exceeds 20 g/m 2 , further improvement of the moisture-proof and waterproof properties of the moisture-proof paper cannot be expected, but the production cost may be reduced. This will result in an increase.
また、本発明の防湿性紙の塗工層は、表面の平滑度が２５秒以上、好ましくは３０秒以上、より好ましくは４０秒以上の範囲であってよい。防湿性紙の塗工層の表面の平滑度が上記の範囲であることにより、塗工層の表面において高い光沢が得られ、より美粧性に優れた防湿性紙が得られる。 Further, the coating layer of the moisture-proof paper of the present invention may have a surface smoothness of 25 seconds or more, preferably 30 seconds or more, and more preferably 40 seconds or more. When the surface smoothness of the coating layer of the moisture-proof paper is within the above range, high gloss can be obtained on the surface of the coating layer, and a moisture-proof paper with better cosmetic properties can be obtained.
上記の平滑度は、ＪＩＳ Ｐ８１５５に準拠して測定される王研式平滑度である。 The above smoothness is Oken type smoothness measured in accordance with JIS P8155.
また、本発明の防湿性紙の塗工層は、表面の水接触角が４５度以上、好ましくは５０度以上、より好ましくは５５度以上であり、表面の１２０秒コッブ吸水度の上限が３ｇ／ｍ２以下、好ましくは２ｇ／ｍ２以下、より好ましくは１ｇ／ｍ２以下の範囲であってよく、下限は特に限定されないが、０ｇ／ｍ２（吸水せず測定限界値未満）が好ましい。防湿性紙の塗工層の表面の水接触角、１２０秒コッブ吸水度が上記の範囲であることにより、塗工層の防湿性と防水性が優れたものとなる。 Furthermore, the coating layer of the moisture-proof paper of the present invention has a water contact angle on the surface of 45 degrees or more, preferably 50 degrees or more, more preferably 55 degrees or more, and the upper limit of the 120 second Cobb water absorption of the surface is 3 g. /m 2 or less, preferably 2 g/m 2 or less, more preferably 1 g/m 2 or less, and the lower limit is not particularly limited, but 0 g/m 2 (no water absorption and less than the measurement limit) is preferable. . When the water contact angle and 120 second Cobb water absorption on the surface of the coating layer of the moisture-proof paper are within the above ranges, the coating layer has excellent moisture-proofing and waterproofing properties.
上記の１２０秒コッブ吸水度は、ＪＩＳ Ｐ８１４０（コッブ法）に準拠して、１００ｍｌの蒸留水を塗工層に接触させ、１２０秒後に吸収された水の単位面積あたりの重量を測定する。１２０秒コッブ吸水度が低いほど、塗工層の吸水性が低いものとなる。 The above 120 second Cobb water absorption is determined by bringing 100 ml of distilled water into contact with the coating layer and measuring the weight per unit area of absorbed water after 120 seconds in accordance with JIS P8140 (Cobb method). The lower the 120 second Cobb water absorption, the lower the water absorption of the coating layer.
また、本発明の防湿性紙の塗工層は、平均塗工層厚みの下限が５．５μｍ以上、好ましくは５．７μｍ以上の範囲であることが、防湿性と共に防水性を具備する上で望ましい。この平均塗工層厚みの上限は２０μｍ以下、好ましくは１５μｍ以下、より好ましくは１２．５μｍ以下の範囲であることが望ましい。ここで、平均塗工層厚みは、任意の１０箇所において測定した塗工層の厚みの平均値である。 In addition, the coating layer of the moisture-proof paper of the present invention should have a lower limit of average coating layer thickness of 5.5 μm or more, preferably 5.7 μm or more, in order to have moisture-proof and waterproof properties. desirable. The upper limit of the average coating layer thickness is preferably 20 μm or less, preferably 15 μm or less, and more preferably 12.5 μm or less. Here, the average coating layer thickness is the average value of the coating layer thicknesses measured at ten arbitrary locations.
また、本発明の防湿性紙の塗工層は、塗工層の単位厚さ当たりの透湿度の上限が１０（ｇ／ｍ２・２４ｈ）／μｍ以下、好ましくは８（ｇ／ｍ２・２４ｈ）／μｍ以下であることが、防湿性と共に防水性を具備する上で望ましい。ここで、塗工層の単位厚さ当たりの透湿度は、防湿性紙の塗工層側からＪＩＳ Ｚ ０２０８に準拠して測定した透湿度を平均塗工層厚みで除して算出する値である。 Further, the coating layer of the moisture-proof paper of the present invention has an upper limit of moisture permeability per unit thickness of the coating layer of 10 (g/m 2 · 24 h)/μm or less, preferably 8 (g/m 2 · 24 h)/μm or less is desirable in terms of providing moisture proofing and waterproofing properties. Here, the moisture permeability per unit thickness of the coating layer is a value calculated by dividing the moisture permeability measured from the coating layer side of moisture-proof paper in accordance with JIS Z 0208 by the average coating layer thickness. be.
このような本発明の防湿性紙は、優れた防湿性と共に防水性を備え、、且つ、、高い白色度を備えており、これにより、湿気や水分と接触する用途において強度低下が抑制されると共に、塗工層面の美粧性が優れるという効果が奏される。 The moisture-proof paper of the present invention has excellent moisture-proof properties, waterproof properties, and high whiteness, which suppresses a decrease in strength in applications where it comes into contact with moisture or moisture. At the same time, the effect of having excellent cosmetic properties on the surface of the coating layer is achieved.
[防湿性紙の製造方法]
本発明の防湿性紙の製造方法は、紙基材の少なくとも一方の面に、合成樹脂およびワックスを含有する塗工剤をブレード塗工方式により塗工し、塗工された塗工剤を乾燥して塗工層とすることにより防湿性紙を製造するものである。
[Method for manufacturing moisture-proof paper]
The method for producing moisture-proof paper of the present invention involves applying a coating agent containing synthetic resin and wax to at least one side of a paper base material using a blade coating method, and drying the applied coating agent. Moisture-proof paper is produced by forming a coating layer.
本発明で使用する紙基材は、防湿性紙の用途に応じて所望の紙基材を使用することができる。本発明に使用する紙基材を抄造する場合、原料パルプとして、例えば、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹未晒クラフトパルプ（ＮＵＫＰ）、広葉樹未晒クラフトパルプ（ＬＵＫＰ）、砕木パルプ（ＧＰ）、リファイナーグラウンドパルプ（ＲＧＰ）、ケミカルパルプ（ＣＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）等の木材繊維由来の各種パルプ、ケナフ、バガス、竹、麻、ワラなどから得られた非木材パルプを使用することができる。 As the paper base material used in the present invention, a desired paper base material can be used depending on the use of the moisture-proof paper. When manufacturing the paper base material used in the present invention, raw material pulps include, for example, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood unbleached kraft pulp (NUKP), and hardwood unbleached kraft pulp ( Various pulps derived from wood fibers such as LUKP), groundwood pulp (GP), refined ground pulp (RGP), chemical pulp (CP), thermomechanical pulp (TMP), and chemithermomechanical pulp (CTMP), kenaf, bagasse, and bamboo. Non-wood pulp obtained from , hemp, straw, etc. can be used.
紙基材の抄造では、古紙パルプを使用することができ、紙基材における古紙パルプ配合率は、防湿性紙の用途に応じて適宜設定することができる。古紙パルプとしては、段ボール古紙、上白、特白、中白、白損等の未印刷古紙を離解した古紙パルプ、上質紙、上質コート紙、中質紙、中質コート紙、更紙等に印刷された古紙、および筆記された古紙、廃棄機密文書等の紙類、雑誌古紙、新聞古紙を離解後脱墨したパルプ（ＤＩＰ）等を使用することができる。 Waste paper pulp can be used in paper making of the paper base material, and the content ratio of the waste paper pulp in the paper base material can be appropriately set depending on the use of the moisture-proof paper. Waste paper pulp includes waste paper pulp obtained by disintegrating unprinted waste paper such as corrugated cardboard, white paper, special white paper, middle white paper, white loss, etc., wood-free paper, wood-free coated paper, medium-quality paper, medium-quality coated paper, and recycled paper. It is possible to use pulp (DIP) obtained by disintegrating and deinking paper such as printed waste paper, written waste paper, paper such as discarded confidential documents, used magazine paper, and waste newspaper paper.
また、紙基材の抄造では、吸湿防止用のサイズ剤や撥水剤を内添又は外添させることができ、更に、強度を向上させるために紙力増強剤を内添させることができる。サイズ剤としては、例えば、ロジン系サイズ剤、ロジンエマルジョン系サイズ剤、α－カルボキシルメチル飽和脂肪酸等、また、中性ロジン系サイズ剤、アルキルケテンダイマー（ＡＫＤ）、アルケニル無水コハク酸（ＡＳＡ）、カチオンポリマー系サイズ剤等が挙げられる。また、撥水剤としては、フッ素系樹脂、ポリアミド系樹脂、ワックスエマルジョン等が挙げられる。また、紙力増強剤としては、ポリアクリルアミド（ＰＡＭ）や変性でん粉等の従来から使用されている紙力増強剤が挙げられる。 Furthermore, in papermaking of paper base materials, sizing agents and water repellents for preventing moisture absorption can be added internally or externally, and furthermore, paper strength enhancers can be internally added to improve strength. Sizing agents include, for example, rosin-based sizing agents, rosin emulsion-based sizing agents, α-carboxylmethyl saturated fatty acids, and neutral rosin-based sizing agents, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), Examples include cationic polymer sizing agents. Furthermore, examples of the water repellent include fluororesins, polyamide resins, wax emulsions, and the like. Examples of the paper strength enhancer include conventionally used paper strength enhancers such as polyacrylamide (PAM) and modified starch.
また、必要に応じて紙基材に公知の填料を内添させることができる。填料としては、例えば、カオリン、焼成カオリン、デラミネーティッドカオリン、クレー、焼成クレー、デラミネーティッドクレー、イライト、重質炭酸カルシウム、軽質炭酸カルシウム、軽質炭酸カルシウム－シリカ複合物、炭酸マグネシウム、炭酸バリウム、二酸化チタン、酸化亜鉛、酸化珪素、非晶質シリカ、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛等の無機填料、及び尿素－ホルマリン樹脂、ポリスチレン樹脂、フェノール樹脂等の有機填料等が挙げられる。 Further, a known filler can be internally added to the paper base material if necessary. Examples of fillers include kaolin, calcined kaolin, delaminated kaolin, clay, calcined clay, delaminated clay, illite, heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica composite, magnesium carbonate, barium carbonate. , inorganic fillers such as titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, and organic fillers such as urea-formalin resin, polystyrene resin, and phenolic resin. etc.
更に、紙基材の品質に影響のない範囲で、硫酸バンド、塩化アルミニウム、アルミン酸ソーダ、塩基性アルミニウム化合物、水溶性アルミニウム化合物、多価金属化合物、シリカゾル等を内添して使用してもよい。 Furthermore, as long as the quality of the paper base material is not affected, aluminum sulfate, aluminum chloride, sodium aluminate, basic aluminum compounds, water-soluble aluminum compounds, polyvalent metal compounds, silica sol, etc. may be added internally. good.
使用する紙基材は、単層紙であってよく、また、２層以上の紙層を有する多層抄き板紙であってもよい。また、紙基材の坪量は、防湿性紙の用途に応じて適宜設定することができる。紙基材が単層紙である場合、その坪量の下限は１０ｇ／ｍ２以上、上限は２５０ｇ／ｍ２以下の範囲で適宜設定することができ、例えば、紙基材がクラフト紙の場合、坪量の下限は３０ｇ／ｍ２以上、上限は２５０ｇ／ｍ２以下の範囲で設定することができる。また、紙基材が２層以上の紙層を有する多層抄き板紙である場合、その坪量の下限は１００ｇ／ｍ２以上、上限は７５０ｇ／ｍ２以下の範囲で適宜設定することができ、例えば、段ボールのライナの場合、坪量の下限は１００ｇ／ｍ２以上、上限は５５０ｇ／ｍ２以下の範囲で設定することができる。 The paper substrate used may be a single layer paper or a multilayer paperboard having two or more paper layers. Furthermore, the basis weight of the paper base material can be appropriately set depending on the use of the moisture-proof paper. When the paper base material is single-layer paper, the lower limit of the basis weight can be set appropriately in the range of 10 g/m 2 or more and the upper limit 250 g/m 2 or less. For example, when the paper base material is kraft paper The lower limit of the basis weight can be set in a range of 30 g/m 2 or more, and the upper limit can be set in a range of 250 g/m 2 or less. In addition, when the paper base material is a multilayer paperboard having two or more paper layers, the lower limit of the basis weight can be set as appropriate within the range of 100 g/ m2 or more and the upper limit of 750 g/ m2 or less. For example, in the case of a corrugated liner, the lower limit of the basis weight can be set in a range of 100 g/m 2 or more, and the upper limit can be set in a range of 550 g/m 2 or less.
本発明では、上記のような紙基材の所望の一方の面、あるいは、両面に、合成樹脂およびワックスを含有する塗工剤をブレード塗工方式により塗工する。 In the present invention, a coating agent containing a synthetic resin and wax is applied to one or both desired surfaces of the paper base material as described above by a blade coating method.
紙基材への塗工剤の塗工をブレード塗工方式により行うことにより、形成される塗工層の表面の平滑度が高いものとなり、塗工層の表面において高い光沢が得られ、より美粧性に優れた防湿性紙が得られる。 By applying the coating agent to the paper base material using the blade coating method, the surface of the coating layer that is formed has a high degree of smoothness, and high gloss can be obtained on the surface of the coating layer. Moisture-proof paper with excellent cosmetic properties can be obtained.
ブレード塗工方式による塗工剤の塗工量は、製造された防湿性紙の透湿度が５０ｇ／ｍ２・２４ｈ以下、好ましくは２０ｇ／ｍ２・２４ｈ以下、より好ましくは１０ｇ／ｍ２・２４ｈ以下となるように設定する。例えば、塗工剤の塗工量を２０ｇ／ｍ２以下とすることが好ましい。塗工剤の塗工量が２０ｇ／ｍ２を超えると、防湿性紙の防湿性と防水性の更なる向上は望めない一方で、製造コストの増大を来すことになる。 The coating amount of the coating agent by the blade coating method is such that the moisture permeability of the produced moisture-proof paper is 50 g/m 2 ·24 h or less, preferably 20 g/m 2 ·24 h or less, more preferably 10 g/m 2 · Set it so that it is 24 hours or less. For example, it is preferable that the coating amount of the coating agent be 20 g/m 2 or less. If the coating amount of the coating agent exceeds 20 g/m 2 , further improvement in the moisture-proofing and waterproofing properties of the moisture-proof paper cannot be expected, but the manufacturing cost will increase.
また、ブレード塗工方式による塗工剤の塗工時の紙基材の送り速度は、塗工剤の粘度、目標塗工量を考慮して適宜設定することができる。 Further, the feeding speed of the paper base material during application of the coating agent by the blade coating method can be appropriately set in consideration of the viscosity of the coating agent and the target coating amount.
塗工層用の塗工剤は、例えば、溶媒中に合成樹脂とワックスが混合分散されているものを使用することができる。尚、塗工剤には、顔料、バインダー、安定剤、消泡剤、耐水剤、粘性改良剤、保水剤、防腐剤、着色剤等を含有させてもよい。顔料は、形成する塗工層の表面の白色度を向上させることを目的として含有させるものであり、例えば、炭酸カルシウム、酸化チタン、カオリン、クレー、エンジニアードカオリン、デラミネーティッドクレー、タルク、硫酸バリウム、硫酸カルシウム、酸化亜鉛、珪酸、珪酸塩、コロイダルシリカ、サチンホワイト、マイカ、モンモリトナイト等の無機顔料を挙げることができ、これらの顔料を１種単独、あるいは、２種以上の組み合わせで使用することができる。これらの顔料の中で、特に、塗工層の防湿性、防水性を阻害し難い点で、粒子が扁平な形状であるカオリンや炭酸カルシウムもしくはマイカが好適に使用される。このような扁平形状の無機顔料は、アスペクト比が１０以上であることが好ましい。塗工剤への顔料の添加量は、固形分中に５質量％以上、４０質量％以下、好ましくは１０質量％以上、３５質量％以下とすることができる。塗工剤への顔料の添加量が固形分中で５質量％未満であると、白色度の向上効果が十分に得られず、４０質量％を超えると、形成された塗工層の防湿性、防水性が不十分となることがあり好ましくない。 As the coating agent for the coating layer, for example, one in which a synthetic resin and wax are mixed and dispersed in a solvent can be used. The coating agent may contain pigments, binders, stabilizers, antifoaming agents, water resistance agents, viscosity modifiers, water retention agents, preservatives, coloring agents, and the like. Pigments are contained for the purpose of improving the whiteness of the surface of the coating layer to be formed, and examples include calcium carbonate, titanium oxide, kaolin, clay, engineered kaolin, delaminated clay, talc, and sulfuric acid. Examples include inorganic pigments such as barium, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, satin white, mica, and montmorillonite, and these pigments may be used singly or in combination of two or more. can be used. Among these pigments, kaolin, calcium carbonate, or mica, which have flat particles, are particularly preferably used because they do not easily impede the moisture-proofing and waterproofing properties of the coating layer. It is preferable that such a flat-shaped inorganic pigment has an aspect ratio of 10 or more. The amount of pigment added to the coating agent can be 5% by mass or more and 40% by mass or less, preferably 10% by mass or more and 35% by mass or less in the solid content. If the amount of pigment added to the coating agent is less than 5% by mass based on the solid content, a sufficient effect of improving whiteness cannot be obtained, and if it exceeds 40% by mass, the moisture resistance of the formed coating layer will be reduced. , it is not preferable because the waterproof property may become insufficient.
このような本発明の防湿性紙の製造方法によれば、透湿度が５０ｇ／ｍ２・２４ｈ以下であり、塗工層表面の白色度が２０％以上である防湿性紙の製造が可能である。このような防湿性紙は、優れた防湿性を具備すると共に、防湿性紙を用いて容器を作製し、水を入れて３週間放置しても水の染み出しが発生せず、容器の形状が変形しない、あるいは、若干変形はみられるが容器形状が維持されるものである。また、高い白色度を備えているので、塗工層面の美粧性が優れるものである。 According to the method for producing moisture-proof paper of the present invention, it is possible to produce moisture-proof paper whose moisture permeability is 50 g/m 2 · 24 h or less and the whiteness of the surface of the coating layer is 20% or more. be. This type of moisture-proof paper has excellent moisture-proof properties, and even if you make a container using moisture-proof paper, fill it with water and leave it for 3 weeks, water will not seep out, and the shape of the container will remain the same. The container does not deform, or the container shape is maintained although it is slightly deformed. Furthermore, since it has a high degree of whiteness, the surface of the coating layer has excellent cosmetic properties.
本発明に係る防湿性紙の用途には特に制限はなく、例えば、段ボール箱、洗剤等の吸湿性のあるものを内容物とする包装個箱等として用いることができる。 There are no particular limitations on the use of the moisture-proof paper according to the present invention, and it can be used, for example, as a cardboard box, an individual packaging box containing a hygroscopic substance such as a detergent, or the like.
以下に、実施例によって本発明を更に詳細に説明するが、本発明はこれによって限定されるものではない。 EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited thereto.
［実施例１］
（紙基材の準備）
針葉樹未晒クラフトパルプ（ＮＵＫＰ）を６３質量％、古紙パルプを３７質量％の割合で使用し、表面に耐水剤、粘性改良剤、保水剤、防腐剤、着色剤を塗工することにより、３層抄きで坪量２８０ｇ／ｍ２となるようライナ用の板紙を抄造して紙基材（参考試料１）とした。
[Example 1]
(Preparation of paper base material)
By using 63% by mass of softwood unbleached kraft pulp (NUKP) and 37% by mass of waste paper pulp, and coating the surface with a water resistance agent, viscosity improver, water retention agent, preservative, and coloring agent, 3. Paperboard for the liner was made by layer papermaking to have a basis weight of 280 g/m 2 and was used as a paper base material (Reference Sample 1).
（塗工層の形成）
溶媒中にスチレン系樹脂およびアクリル系樹脂とパラフィンを含む炭化水素系ワックスが混合分散された防湿剤（マイケルマン社製 ＶＡＰＯＲＣＯＡＴ２２００．Ｓ）１００質量部に、消泡剤０．４６質量部を添加して塗工剤Ａを調製した。この塗工剤Ａを使用し、下記の表１に示すような３種の塗工量となるように、上記の紙基材（参考試料１）の片面にブレード塗工方式により塗工し、塗工層温度が９０℃となるように乾燥して塗工層を形成した。これにより、３種の防湿性紙（試料１－１～試料１－３）を作製した。
(Formation of coating layer)
0.46 parts by mass of an antifoaming agent was added to 100 parts by mass of a desiccant agent (VAPORCOAT 2200.S, manufactured by Michael Mann), in which a styrene resin, an acrylic resin, and a hydrocarbon wax containing paraffin were mixed and dispersed in a solvent. Coating agent A was prepared. Using this coating agent A, coat it on one side of the paper base material (reference sample 1) using a blade coating method so that the three coating amounts shown in Table 1 below are obtained. A coating layer was formed by drying so that the coating layer temperature was 90°C. As a result, three types of moisture-proof paper (Sample 1-1 to Sample 1-3) were produced.
また、上記の防湿剤１００質量部に消泡剤０．４６質量部、高扁平カオリン４０質量部、合成マイカ１０質量部を添加して塗工剤Ｂを調製した。この塗工剤Ｂを使用し、下記の表１に示すような４種の塗工量となるように、上記の紙基材（参考試料１）の片面にブレード塗工方式により塗工し、塗工層温度が９０℃となるように乾燥して塗工層を形成した。これにより、４種の防湿性紙（試料１－４～試料１－７）を作製した。 Further, a coating agent B was prepared by adding 0.46 parts by mass of an antifoaming agent, 40 parts by mass of high flat kaolin, and 10 parts by mass of synthetic mica to 100 parts by mass of the above desiccant agent. Using this coating agent B, coat it on one side of the above paper base material (reference sample 1) by a blade coating method so that the coating amount becomes 4 types as shown in Table 1 below, A coating layer was formed by drying so that the coating layer temperature was 90°C. As a result, four types of moisture-proof papers (Sample 1-4 to Sample 1-7) were produced.
（物性測定）
上記のように作製した７種の防湿性紙（試料１－１～試料１－７）、および、紙基材（参考試料１）について、透湿度、塗工層表面の平滑度、白色度、吸水度、防湿性紙の防水性を以下のように測定、評価し、結果を下記の表１に示した。
(Measurement of physical properties)
Regarding the seven types of moisture-proof paper (Samples 1-1 to 1-7) and paper base material (Reference Sample 1) produced as described above, moisture permeability, smoothness of the coating layer surface, whiteness, Water absorption and moisture-proofing The waterproofness of the paper was measured and evaluated as follows, and the results are shown in Table 1 below.
＜透湿度＞
ＪＩＳ Ｚ ０２０８に準拠して測定する。尚、防湿性紙においては、塗工層側から測定する。
<Moisture permeability>
Measured in accordance with JIS Z 0208. In the case of moisture-proof paper, measurements are taken from the coating layer side.
＜平滑度＞
ＪＩＳ Ｐ８１５５に準拠して、旭精工（株）製デジタル型王研式透気度平滑度試験機にて、王研式平滑度を測定する。
<Smoothness>
In accordance with JIS P8155, the Oken type smoothness is measured using a digital Oken type air permeability smoothness tester manufactured by Asahi Seiko Co., Ltd.
＜白色度＞
ＪＩＳ Ｐ８１４８に準拠して、（株）村上色彩技術研究所ＩＳＯ白色度対応光測色システムＣＭＳ－３５ＳＰＸＭにて測定する。
<Whiteness>
Measurement is performed in accordance with JIS P8148 using an optical colorimetry system CMS-35SPXM manufactured by Murakami Color Research Institute Co., Ltd. that supports ISO whiteness.
＜吸水度＞
ＪＩＳ Ｐ８１４０（コッブ法）に準拠して、１００ｍｌの蒸留水を塗工層に接触させ、１２０秒後に吸収された水の単位面積あたりの重量を測定する。
<Water absorption>
In accordance with JIS P8140 (Cobb method), 100 ml of distilled water is brought into contact with the coating layer, and the weight of absorbed water per unit area is measured after 120 seconds.
＜防水性＞
防湿性紙を用いて縦２８ｃｍ、横２２ｃｍ、深さ１３ｃｍの容器を作製（塗工層は内面側に位置する）し、この容器に１．０Ｌの水を入れ、温度４０℃、湿度８０％の環境下で３週間放置した後の水の染み出し状況を観察して、下記の基準で判定する。
（防水性の判定基準）
○：水が容器外面や水面より上の容器内面に染み出していない。
△：水が容器外面には染み出していないが、水面より上の容器内面に染み出している。
×：水が容器外面や水面より上の容器内面に染み出している。
<Waterproof>
A container with a length of 28 cm, a width of 22 cm, and a depth of 13 cm was made using moisture-proof paper (the coating layer is located on the inner surface), and 1.0 L of water was poured into this container, at a temperature of 40°C and a humidity of 80%. After being left in this environment for 3 weeks, the state of water seepage is observed and judged based on the following criteria.
(Waterproof judgment criteria)
○: Water does not seep into the outer surface of the container or the inner surface of the container above the water surface.
△: Water does not seep out to the outer surface of the container, but it seeps out to the inner surface of the container above the water surface.
×: Water seeps into the outer surface of the container or the inner surface of the container above the water surface.
表１に示されるように、ブレード塗工方式により塗工剤を塗工して作製した防湿性紙の中で、透湿度が５０ｇ／ｍ２・２４ｈ以下であり、塗工層に合成樹脂およびワックスを含有し、塗工層の表面の白色度が２０％以上ある試料１－１～試料１－３（塗工剤Ａを使用）、および、試料１－６～試料１－７（塗工剤Ｂを使用）は、良好な防湿性を有する共に優れた防水性も兼ね備え、また、平滑度も２５秒以上であって高い光沢が得られ、優れた美粧性を有することが確認された。 As shown in Table 1, the moisture permeability of the moisture-proof paper produced by applying the coating agent using the blade coating method is 50 g/ m2.24 h or less, and the coating layer contains synthetic resin and Samples 1-1 to 1-3 (using coating agent A) containing wax and having a surface whiteness of the coating layer of 20% or more, and Samples 1-6 to 1-7 (coating It was confirmed that the material (using agent B) had both good moisture resistance and excellent waterproofness, and also had a smoothness of 25 seconds or more and high gloss, and had excellent cosmetic properties.
本発明に係る防湿性紙は上記のとおりのものであって、防湿性と共に防水性を備えており、これにより、湿気や水分と接触する用途において強度低下が抑制されるという効果があり、また、美粧性に優れているため、段ボール用のライナや製函、包装紙等、種々の用途に用いるのに好適で、その産業上の利用可能性は大である。 The moisture-proof paper according to the present invention is as described above, and has moisture-proof properties as well as waterproof properties, which has the effect of suppressing a decrease in strength in applications where it comes into contact with moisture or water. Since it has excellent cosmetic properties, it is suitable for use in various applications such as liners for corrugated cardboard, box making, and wrapping paper, and has great industrial applicability.
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