JP2016074998A - Transparent paper and method for producing the same - Google Patents

Transparent paper and method for producing the same Download PDF

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JP2016074998A
JP2016074998A JP2014206018A JP2014206018A JP2016074998A JP 2016074998 A JP2016074998 A JP 2016074998A JP 2014206018 A JP2014206018 A JP 2014206018A JP 2014206018 A JP2014206018 A JP 2014206018A JP 2016074998 A JP2016074998 A JP 2016074998A
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paper
transparent
transparency
transparent paper
base paper
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桝本 頼宏
Yorihiro Masumoto
頼宏 桝本
律雄 萬道
Ritsuo Mando
律雄 萬道
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Oji Holdings Corp
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Abstract

PROBLEM TO BE SOLVED: To provide transparent paper having excellent transparency and an excellent appearance with a uniform transparent feeling.SOLUTION: Provided is transparent paper obtained by subjecting base paper containing cellulose fiber as a main component to a parchment treatment, the paper having transparency of 89% or more and a density of 1.00 g/cmor more. Also provided is a method for producing transparent paper where, in a production process of transparent paper obtained by subjecting base paper containing cellulose fiber as a main component to a parchment treatment, (A) a parchment treatment step and (B) a drying step are performed sequentially on base paper having air permeability according to JIS P8117:2009 of 1000 seconds/100 mL or more.SELECTED DRAWING: None

Description

本発明は、パーチメント処理によって得られる透明紙およびその製造方法に関する。 The present invention relates to a transparent paper obtained by parchment treatment and a method for producing the same.

従来、透明紙は、環境意識の高まりから、窓付き封筒の窓材として、フィルムシートからの代替品として使用されており、また薬包紙などは、従来から透明紙が使用されている。
近年、前記した封筒の窓材の他に、プラスチック材料が使用されている分野、例えば、商品パッケージの一部に透明シートを使用したものや、クリアファイルなどは、顧客に対する商品の訴求性や易廃棄性等の面で、透明プラスチック基材から透明紙への代替ニーズが高く、特に、このような透明プラスチック基材からの代替ニーズとしては、意匠性等の観点から、従来よりも均一で透明性の高い透明紙の開発が強く望まれる。
Conventionally, transparent paper has been used as a substitute for a film sheet as a window material for an envelope with a window due to a heightened environmental awareness, and transparent paper has been conventionally used as a medicine-wrapping paper.
In recent years, in addition to the above-mentioned envelope window materials, fields where plastic materials are used, such as products using transparent sheets as part of product packages, clear files, etc. There is a high need for alternatives from transparent plastic substrates to transparent paper in terms of disposal, etc. Especially, the alternative needs from such transparent plastic substrates are more uniform and transparent than conventional from the viewpoint of design etc. Development of highly transparent paper is strongly desired.

紙の透明性は紙層中の空隙量に依存し、セルロースと空気の屈折率差によって、空隙の界面で光が乱反射することにより、紙の透明性は低下する。一般に、セルロース繊維を主体とする材料で構成された紙は、紙層内に無数の微小な空隙を有し、50%程度の空気が含まれているといわれている。紙の透明性を向上させるためには、紙層中の空隙による界面を少なくすることが必要である。このためには、空隙中の空気をセルロースとの屈折率差の小さい材料で置き換えることが有効であり、例えば、特許文献1には、ポリエーテル化合物を含有する透明化剤を原紙に含有する方法が提案されている。しかしながら、この方法では、必ずしも、本発明が目的とする、充分に高い透明性を得ることは難しかった。
また、紙の薄葉化、即ち、紙厚を薄くすること、密度を高くして空隙の比率を減少することも有効と考えられ、特許文献2には、高叩解パルプを原料として抄紙した原紙を強スーパーカレンダー処理する方法が提案されている。しかしながら、この方法では、原紙の地合ムラ等の影響により、原紙地合に対応した原紙中の微小な空隙の影響と推定される、細かい白斑点状のムラが目視でき、全体的な透明性は向上するものの、均一な透明感を低下させるという問題があった。 一方、透明度向上を目的とした単純な紙の薄葉化は紙力強度低下など、別の不具合を惹起する要因となるため好ましくない。
The transparency of the paper depends on the amount of voids in the paper layer, and the light is irregularly reflected at the interface between the voids due to the difference in refractive index between cellulose and air, thereby lowering the transparency of the paper. In general, paper made of a material mainly composed of cellulose fibers has innumerable minute voids in the paper layer and is said to contain about 50% air. In order to improve the transparency of the paper, it is necessary to reduce the interface due to the voids in the paper layer. For this purpose, it is effective to replace the air in the voids with a material having a small refractive index difference from cellulose. For example, Patent Document 1 discloses a method in which a base paper contains a clarifying agent containing a polyether compound. Has been proposed. However, with this method, it has been difficult to obtain sufficiently high transparency, which is an object of the present invention.
It is also considered effective to reduce the paper thickness, that is, to reduce the paper thickness, to increase the density and to reduce the void ratio. A method of processing a strong super calendar has been proposed. However, with this method, fine white spot-like unevenness, which is estimated to be the effect of minute voids in the base paper corresponding to the base paper formation, can be visually observed due to the influence of the base paper formation unevenness, etc., and the overall transparency Improved, but there was a problem of reducing uniform transparency. On the other hand, simple paper thinning for the purpose of improving transparency is not preferable because it causes other problems such as a reduction in paper strength.

特開2012−122174号公報JP 2012-122174 A 特開平8−199499号公報JP-A-8-199499

本発明は、透明性に優れ、かつ均一な透明感を有する優れた外観の透明紙を提供することを目的とする。   An object of the present invention is to provide a transparent paper with excellent appearance and excellent transparency and uniform transparency.

本発明者らは、上記課題を解決するため鋭意研究を重ねた結果、以下の透明紙を開発するに至った。
即ち、本発明は以下の構成を有する。
(1)セルロース繊維を主体とする原紙をパーチメント加工した透明紙であって、透明度が89%以上、密度が1.00g/cm以上であることを特徴とする透明紙。
As a result of intensive studies to solve the above problems, the present inventors have developed the following transparent paper.
That is, the present invention has the following configuration.
(1) A transparent paper obtained by parchment processing of a base paper mainly composed of cellulose fibers, wherein the transparency is 89% or more and the density is 1.00 g / cm 3 or more.

(2)JIS P8117:2009による透気度が100000秒/100mL以上であることを特徴とする上記(1)に記載の透明紙。 (2) The transparent paper as described in (1) above, wherein the air permeability according to JIS P8117: 2009 is 100,000 seconds / 100 mL or more.

(3) 前記原紙の厚さが60μm以下であることを特徴とする上記(1)または(2)に記載の透明紙。 (3) The transparent paper as described in (1) or (2) above, wherein the thickness of the base paper is 60 μm or less.

(4)セルロース繊維を主体とする原紙をパーチメント加工した透明紙の製造工程において、JIS P8117:2009による透気度が1000秒/100mL以上の原紙に(A)パーチメント加工工程、(B)乾燥工程を順次行うことを特徴とする、上記(1)〜(3)に記載の透明紙の製造方法。 (4) In a process for producing a transparent paper obtained by parching a base paper mainly composed of cellulose fibers, the base paper having an air permeability of 1000 seconds / 100 mL or more according to JIS P8117: 2009 (A) Parchment processing step, (B) Drying step Are performed sequentially, The manufacturing method of the transparent paper as described in said (1)-(3) characterized by the above-mentioned.

本発明は、透明性に優れ、かつ均一な透明感の優れた外観を有するとともに、紙層の強度に優れた透明紙を提供する。また、本発明によって得られる透明紙は、油脂に対する遮蔽性(耐油性)に優れるのみならず、油性インクによる筆記性、印刷性にも優れる。   The present invention provides a transparent paper excellent in transparency and having an excellent appearance with uniform transparency, and excellent in the strength of the paper layer. Moreover, the transparent paper obtained by the present invention is excellent not only in oil shielding properties (oil resistance) but also in writing properties and printability with oil-based inks.

本発明の透明紙はセルロース繊維を主体とする原紙をパーチメント加工して製造され、該原紙の原材料はセルロース繊維を主体とする。該セルロース繊維としては、植物由来のパルプ繊維が好ましく使用される。特に、工業原料として安定した品質で入手が容易であるといった利点から、針葉樹パルプ、広葉樹パルプといった木材パルプが好ましく用いられる。また、上記、木材パルプ以外にも、麻パルプやケナフ、竹などの非木材パルプも使用できる。また、必要に応じて、レーヨン繊維、ポリエチレン繊維、ポリプロピレン繊維、ポリエステル繊維などの合成繊維といったパルプ繊維以外の材料を適宜添加することも出来る。一般に、木材パルプは、原料の木材からセルロース以外の成分を除去するために、種々の蒸解工程や漂白工程を用いられる。本発明において、蒸解工程や漂白工程は特に限定されず、適宜、公知の方法を用いることが出来る。特に、本発明の優れた透明紙の製造に有利な、高強度で、均一な高密度の原紙を得るためには、針葉樹晒クラフトパルプ(NBKP)が好適であり、本発明の原紙を構成する原料パルプとして原紙中に多く配合されることが好ましい。   The transparent paper of the present invention is produced by parchment processing a base paper mainly composed of cellulose fibers, and the raw material of the base paper is mainly composed of cellulose fibers. As the cellulose fiber, plant-derived pulp fiber is preferably used. In particular, wood pulp such as softwood pulp and hardwood pulp is preferably used from the advantage that it is stable and easy to obtain as an industrial raw material. In addition to the above wood pulp, non-wood pulp such as hemp pulp, kenaf and bamboo can also be used. Moreover, materials other than pulp fibers, such as synthetic fibers, such as rayon fiber, polyethylene fiber, polypropylene fiber, and polyester fiber, can be added as necessary. In general, wood pulp is subjected to various cooking steps and bleaching steps in order to remove components other than cellulose from the raw wood. In the present invention, the cooking step and the bleaching step are not particularly limited, and a known method can be appropriately used. In particular, softwood bleached kraft pulp (NBKP) is suitable for obtaining a high-strength, uniform, high-density base paper advantageous for the production of the excellent transparent paper of the present invention, and constitutes the base paper of the present invention. It is preferable that a large amount of raw material pulp is blended in the base paper.

パルプ繊維は、使用される紙の種類に応じて、叩解処理されて抄紙工程に供される。叩解処理を進めることにより、一般に、パルプ繊維はよりしなやかになり、高密度の原紙を得やすくなる。また、透明性も向上するので、本発明に使用されるパルプ繊維は叩解処理されることが好ましい。一方、パルプの叩解処理を進めると、ろ水が悪くなり、操業効率が低下する。このため、叩解を進める程度は目的とする紙の透明度、坪量、操業効率などを考慮して適宜選定される。パルプを叩解処理するためには、例えば、DDR(ダブルディスクリファイナー)などの叩解装置が好ましく使用される。   The pulp fiber is subjected to a beating process according to the type of paper used, and is provided to the paper making process. By proceeding with the beating process, generally, the pulp fiber becomes more supple and it becomes easier to obtain a high-density base paper. Moreover, since the transparency is improved, the pulp fiber used in the present invention is preferably beaten. On the other hand, when the pulp beating process is advanced, the drainage becomes worse and the operation efficiency is lowered. For this reason, the degree to which beating is advanced is appropriately selected in consideration of the transparency, basis weight, operation efficiency, and the like of the target paper. In order to beat the pulp, a beating device such as DDR (double disc refiner) is preferably used.

パルプ繊維の叩解処理の程度は、ろ水の程度を示すフリーネス(ろ水度)と呼ばれる値を用いて調節され、本発明で使用するパルプ繊維は、変則フリーネス100〜300ccの範囲に調節されることが好ましい。ここで、変則フリーネスとは、本発明の透明紙に用いる原紙では一般的なカナダ標準フリーネスでは測定が難しいため、本発明においては、0.3%パルプ濃度でのろ水度を測定するカナダ標準フリーネスに代えて、0.03%パルプ濃度でのろ水度をカナダ標準フリーネスと同様の方法で測定し、本発明においては、これを変則フリーネスと称する。変則フリーネスの値は、カナダ標準フリーネスと同様、叩解処理を進めることにより小さくなる。変則フリーネス100cc以上とすることにより、抄紙工程での脱水は良くなり、操業性、生産性に優れる。一方、300cc以下であることにより、充分な透明度を得ることが出来る。 The degree of beating of the pulp fiber is adjusted using a value called freeness (freeness) indicating the degree of drainage, and the pulp fiber used in the present invention is adjusted in the range of 100 to 300 cc of irregular freeness. It is preferable. Here, the irregular freeness is difficult to measure with the standard Canadian standard freeness for the base paper used for the transparent paper of the present invention. Therefore, in the present invention, the Canadian standard for measuring the freeness at 0.3% pulp concentration. Instead of freeness, the freeness at 0.03% pulp concentration is measured in the same way as Canadian standard freeness, and in the present invention this is called irregular freeness. The anomalous freeness value is reduced by proceeding with the beating process, similar to the Canadian standard freeness. By setting the irregular freeness to 100 cc or more, dehydration in the paper making process is improved, and the operability and productivity are excellent. On the other hand, when it is 300 cc or less, sufficient transparency can be obtained.

上記、パルプ繊維には、パーチメント処理時の硫酸の含浸性を阻害しない範囲で、サイズ剤、紙力増強剤、着色料等の内添薬品を必要に応じ配合することができ、原料として調製される。この原料を抄紙工程に供して得られた原紙は、さらにカレンダー処理され、本発明の透明紙に用いられる透明紙原紙が得られる。抄紙工程は、適宜公知の方法を使用することが出来る。また、カレンダー処理に使用されるカレンダー設備も、特に限定されるものではなく、マシンカレンダー、ソフトカレンダー、スーパーカレンダー、グロスカレンダー等、公知のものを適宜使用することが出来る。   In the above-mentioned pulp fiber, internal additives such as a sizing agent, paper strength enhancer, and coloring agent can be blended as necessary within a range not impairing the impregnation property of sulfuric acid during the parchment treatment, and prepared as a raw material. The The base paper obtained by subjecting this raw material to the paper making process is further calendered to obtain a transparent paper base paper used for the transparent paper of the present invention. In the paper making process, a known method can be used as appropriate. Moreover, the calendar equipment used for the calendar process is not particularly limited, and a known machine such as a machine calendar, a soft calendar, a super calendar, a gloss calendar, etc. can be used as appropriate.

本発明の透明紙に使用される透明紙原紙は、密度としては1.10g/cm以上、透明度は85%以上であることが好ましく、より好ましくは88%以上であり、JIS P8117:2009による透気度は1000秒/100mL以上が好ましく、より好ましくは10000秒/100mL以上、さらに好ましくは100000秒/100mL以上である。パーチメント処理による原紙の膨潤によって密度が僅かに低下するが、透明紙原紙の密度が1.10g/cm以上の場合は、パーチメント処理後の密度が1.00g/cm以上の透明紙を得ること出来る。 また、透明紙原紙の透明度が85%以上、あるいは透気度が1000秒/100mL以上の場合は、紙層中の空隙が少ないことにより、パーチメント処理後の透明度が89%以上の透明紙を得ることが出来る。上記のような透明紙原紙としては、例えば、叩解を進めたパルプ繊維から製造された原紙をさらに高圧で加工して高密度に加工したグラシン紙などを挙げることができ、本発明の透明紙原紙として好ましく使用することが出来る。 The transparent paper base paper used for the transparent paper of the present invention has a density of 1.10 g / cm 3 or more, preferably a transparency of 85% or more, more preferably 88% or more, according to JIS P8117: 2009. The air permeability is preferably 1000 seconds / 100 mL or more, more preferably 10,000 seconds / 100 mL or more, and further preferably 100,000 seconds / 100 mL or more. Density decreases slightly by swelling of the base paper by parchmenting, but the density of the transparent paper sheet is the case of 1.10 g / cm 3 or more, density after parchmented get 1.00 g / cm 3 or more transparencies I can do it. Further, when the transparency of the transparent base paper is 85% or more, or the air permeability is 1000 seconds / 100 mL or more, a transparent paper having a transparency after the parchment treatment of 89% or more is obtained by reducing the voids in the paper layer. I can do it. Examples of the transparent paper base paper as described above include glassine paper obtained by processing a high-pressure processed base paper made from pulp fibers that have been beaten, and the transparent paper base paper of the present invention. Can be preferably used.

また、本発明で使用する透明紙原紙の厚さは60μm以下が好ましい態様である。透明紙原紙の厚さを60μm以下とすることにより、透明紙原紙層中で、パーチメント処理の効果の出難い部分が生じるのを抑制することが出来、透明度の低下や、白斑点ムラの発生を防止し、均一な透明性を得ることが出来る。 In addition, the thickness of the transparent base paper used in the present invention is preferably 60 μm or less. By setting the thickness of the transparent paper base sheet to 60 μm or less, it is possible to suppress the occurrence of the part where the effect of the parchment treatment is difficult to occur in the transparent paper base paper layer, and it is possible to reduce the transparency and the occurrence of white spot unevenness. And uniform transparency can be obtained.

本発明の透明紙は、上記のようにして得られた透明紙原紙をパーチメント処理することによって得られる。パーチメント処理は、硫酸をセルロース膨潤剤として使用する変性加工であり、原紙を硫酸に浸漬した後、中和および/または水洗を繰り返し、乾燥する一連の工程によって行われる。浸漬時間は、一概に限定することは出来ないが、透明度が89%以上となるように、透明紙原紙の厚み、密度、サイズ度や、洗浄能力、乾燥能力などを考慮して、適宜調節することが出来る。   The transparent paper of the present invention can be obtained by subjecting the transparent paper base paper obtained as described above to a parchment treatment. The parchment treatment is a modification process using sulfuric acid as a cellulose swelling agent, and is performed by a series of steps in which the base paper is immersed in sulfuric acid, and then neutralized and / or washed with water repeatedly and dried. Although the immersion time cannot be generally limited, it is appropriately adjusted in consideration of the thickness, density, sizing degree, cleaning ability, drying ability, etc. of the transparent paper base paper so that the transparency is 89% or more. I can do it.

セルロースからなるパルプ繊維で構成された原紙を硫酸に浸漬すると、セルロースは膨潤、加水分解して溶解する。溶解したセルロースは粘ちょうで半透明なゼラチン状の物質となり、原紙表面を被覆、繊維間を強く結びつけ、さらに紙層中の細孔、空隙を埋め、非常に緻密な紙層構造を形成する。その結果、紙力(破壊強度)が向上するとともに、紙層中の空隙が減少し透明化が促進される。 本発明の透明紙に使用する透明紙原紙としてのステキヒトサイズ度は3秒以下に調節されることが好ましく、より好ましくは2秒以下である。透明紙原紙のステキヒトサイズ度を3秒以下とすることにより、パーチメント処理時に充分に硫酸を浸透させることによって、充分な透明性が得られる。 When a base paper composed of pulp fibers made of cellulose is immersed in sulfuric acid, the cellulose swells, hydrolyzes and dissolves. The dissolved cellulose becomes a viscous and translucent gelatinous substance, covering the base paper surface, strongly connecting fibers, and further filling the pores and voids in the paper layer to form a very dense paper layer structure. As a result, paper strength (breaking strength) is improved, and voids in the paper layer are reduced to promote transparency. The degree of Steecht size as a transparent paper base used for the transparent paper of the present invention is preferably adjusted to 3 seconds or less, more preferably 2 seconds or less. By setting the sizing degree of the transparent base paper to 3 seconds or less, sufficient transparency can be obtained by sufficiently infiltrating the sulfuric acid during the parchment treatment.

セルロースの加水分解により生成したゼラチン状の物質は、中和および/または水洗工程によって加水分解反応が停止し、水和セルロースとなる。したがって、化学的には原紙と同一成分のセルロースによって、紙の空隙が閉塞されるために、透明性が向上するとともに、透明紙原紙の地合、或いは透明紙原紙層中の空隙に起因すると推定される微小な白斑点ムラが軽減され、結果的にムラのない、均一な透明性を有する透明紙を得ることが出来る。
空隙の少ない本発明の透明紙原紙にパーチメント処理を行って得られた透明紙は、パーチメント処理によって空隙が塞がれていることから、非常に優れた耐油性を示す。 さらに、表面が均一な粗面化され、水溶性インクおよび油性インクによる筆記性や捺印性、印刷性にも優れ、筆記、捺印あるいは印刷後に擦れてもにじみ難いという特徴があり、種々の応用に適用することが出来る。
The gelatinous substance produced by the hydrolysis of cellulose stops its hydrolysis reaction by the neutralization and / or washing process, and becomes hydrated cellulose. Therefore, the gap between the papers is chemically blocked by cellulose, which is the same component as the base paper, so that the transparency is improved, and it is estimated that it is caused by the formation of the transparent paper base paper or the gaps in the transparent paper base paper layer. As a result, it is possible to obtain a transparent paper having uniform transparency without any uneven white spots.
The transparent paper obtained by subjecting the transparent paper base paper of the present invention having few voids to the parchment treatment exhibits very excellent oil resistance since the voids are closed by the parchment treatment. In addition, it has a uniform surface, excellent writing properties, imprintability, and printability with water-soluble inks and oil-based inks, and is difficult to bleed even when rubbed after writing, imprinting, or printing. It can be applied.

パーチメント処理された本発明の透明紙は、さらに、公知の塗布装置、含浸装置等を用いて高分子化合物などの処理剤を付与することも出来る。このような塗布・含浸は、パーチメント処理工程中に組み込まれたインライン工程であっても、パーチメント処理で原紙を硫酸に浸漬した後、中和および/または水洗を繰り返し、乾燥する一連の工程を経た後、オフライン工程で行うことも出来る。しかしながら、一連のパーチメント処理工程を経た透明紙は、非常に緻密な紙層構造であるため、紙層中への浸透を十分に出来る様、透明紙に対する高分子化合物の付与は、インライン工程で行うことが好ましい。
本発明の透明紙に高分子化合物を塗布あるいは含浸によって付与することにより、さらに、透明性の向上、及び柔軟性を付与することが可能である。
また高分子化合物などの処理剤としては特に限定されるものではないが、例えばグリセリン等の多価アルコール類が保湿効果による柔軟性の付与、及び安全性や経済性に優れるため好ましく使用できる。
The transparent paper of the present invention that has been subjected to parchment treatment can be further provided with a treating agent such as a polymer compound using a known coating apparatus, impregnation apparatus or the like. Even if such coating and impregnation is an in-line process incorporated in the parchment treatment process, after the base paper is immersed in sulfuric acid in the parchment treatment, it is subjected to a series of processes in which neutralization and / or water washing is repeated and dried. Later, it can also be performed in an off-line process. However, since transparent paper that has undergone a series of parchment processing steps has a very dense paper layer structure, the polymer compound is applied to the transparent paper in an in-line step so that the paper can be sufficiently penetrated into the paper layer. It is preferable.
By applying or impregnating a polymer compound to the transparent paper of the present invention, it is possible to further improve transparency and impart flexibility.
The treating agent such as a polymer compound is not particularly limited. For example, polyhydric alcohols such as glycerin can be preferably used because they are excellent in imparting flexibility due to a moisturizing effect and in safety and economy.

さらに、本発明の透明紙には、必要に応じてカレンダー処理を施すことができる。カレンダー処理によって、紙の厚み低減し、密度を高くすることが出来、更なる透明性の向上を期待することができる。   Furthermore, the transparent paper of the present invention can be subjected to a calendar process as necessary. By the calendar process, the thickness of the paper can be reduced, the density can be increased, and further improvement in transparency can be expected.

以下実施例により本発明をさらに詳しく説明する。なお、実施例及び比較例における%、部は、特に断りのない限り質量%、質量部を示す。   Hereinafter, the present invention will be described in more detail with reference to examples. In addition,% and a part in an Example and a comparative example show the mass% and a mass part unless there is particular notice.

<実施例1>
(透明紙原紙の作成)
針葉樹クラフトパルプ(NBKP)100部のパルプスラリーをレファイナーで叩解して変則フリーネスが200ccのパルプスラリーを調整した。
上記パルプスラリーに、内添薬品として、パルプ質量に対し、絶乾でポリアミドエピクロルヒドリン系湿潤紙力剤(荒川化学工業製:アラフィックス255)0.3%、硫酸バンド0.5%を添加した。得られた紙料を長網抄紙機にて抄紙し、坪量35g/mの原紙を得た。次いで原紙をスーパーカレンダー処理し、密度1.18g/cm、透明度89%、厚さ29μmの透明紙原紙を得た。
(透明紙の作成)
パーチメント加工機を用い、上記原紙をパーチメント処理し、透明紙を得た。
<Example 1>
(Creating transparent paper)
A pulp slurry of 100 parts of softwood kraft pulp (NBKP) was beaten with a refiner to prepare a pulp slurry having an irregular freeness of 200 cc.
To the pulp slurry, as an internally added chemical, 0.3% polyamide epichlorohydrin wet paper strength agent (Arakawa Chemical Industries, Ltd .: Arafix 255) and 0.5% sulfuric acid band were added to the pulp mass. The obtained paper stock was made with a long paper machine to obtain a base paper having a basis weight of 35 g / m 2 . Next, the base paper was supercalendered to obtain a transparent base paper having a density of 1.18 g / cm 3 , a transparency of 89% and a thickness of 29 μm.
(Creating transparent paper)
Using a parchment processing machine, the base paper was subjected to parchment treatment to obtain a transparent paper.

<実施例2>
実施例1の(透明紙の作成)において、パーチメント処理を行った後、インラインの含浸装置によって、グリセリンを塗被、乾燥した以外は、実施例1と同様にして透明紙を得た。
<Example 2>
In Example 1 (preparation of transparent paper), a transparent paper was obtained in the same manner as in Example 1 except that after parchment treatment was performed, glycerin was applied and dried by an inline impregnation apparatus.

<実施例3>
実施例1において、原紙の米坪を65g/mとし、スーパーカレンダー後の厚さ55μm、密度1.23g/cm、透明度85%とした以外は、実施例1と同様にして透明紙を得た。
<Example 3>
In Example 1, a transparent paper was prepared in the same manner as in Example 1 except that the base weight of the base paper was 65 g / m 2 , the thickness after supercalendering was 55 μm, the density was 1.23 g / cm 3 , and the transparency was 85%. Obtained.

<実施例4>
実施例1の(透明紙原の作成)において、米坪75g/mの原紙を作成し、得られた原紙をスーパーカレンダー処理し、厚さ61.5μm、密度1.22g/cm、透明度84%の透明紙原紙を得た。次いで、比較例2の(透明紙の作成)と同様にして透明紙を得た。
<Example 4>
In Example 1 (preparation of a transparent paper base), a base paper having a basis weight of 75 g / m 2 was prepared, and the obtained base paper was supercalendered to have a thickness of 61.5 μm, a density of 1.22 g / cm 3 , and transparency. 84% transparent base paper was obtained. Next, a transparent paper was obtained in the same manner as in Comparative Example 2 (Preparation of transparent paper).

<比較例1>
実施例1の(透明紙の作成)を実施しないほかは、実施例1と同様にして透明紙(透明紙原紙)を得た。
<Comparative Example 1>
A transparent paper (transparent paper base paper) was obtained in the same manner as in Example 1 except that (preparation of transparent paper) in Example 1 was not performed.

<比較例2>
(透明紙原紙の作成)
針葉樹クラフトパルプ(NBKP)80部と、広葉樹クラフトパルプ20部の混合パルプスラリーをレファイナーで叩解して変則フリーネスが450ccのパルプスラリーを調整した。
上記パルプスラリーに、内添薬品として、パルプ質量に対し、絶乾で硫酸バンド0.5%を添加した。得られた紙料を長網抄紙機にて抄紙し、米坪31g/mの原紙を得た。次いで原紙をスーパーカレンダー処理し、厚さ29μm、密度1.05g/cm、透明度83%の透明紙原紙を得た。
(透明紙の作成)
パーチメント加工機を用い、上記原紙をパーチメント処理し、透明紙を得た。
<Comparative Example 2>
(Creating transparent paper)
A pulp slurry having an irregular freeness of 450 cc was prepared by beating a mixed pulp slurry of 80 parts of softwood kraft pulp (NBKP) and 20 parts of hardwood kraft pulp with a refiner.
To the pulp slurry, 0.5% of a sulfuric acid band was added as an internal additive to the pulp mass by absolute drying. The obtained paper stock was made with a long paper machine to obtain a base paper of 31 g / m 2 . Next, the base paper was supercalendered to obtain a transparent base paper having a thickness of 29 μm, a density of 1.05 g / cm 3 and a transparency of 83%.
(Creating transparent paper)
Using a parchment processing machine, the base paper was subjected to parchment treatment to obtain a transparent paper.

<比較例3>
比較例2において、原紙の米坪を26g/mとし、スーパーカレンダー後の厚さ25μm、密度1.02g/cm、透明度84%とした以外は、比較例2と同様にして透明紙を得た。
<Comparative Example 3>
In Comparative Example 2, the transparent paper was prepared in the same manner as in Comparative Example 2 except that the base weight of the base paper was 26 g / m 2 , the thickness after supercalendering was 25 μm, the density was 1.02 g / cm 3 , and the transparency was 84%. Obtained.

実施例、比較例で得た各透明紙を試料として下記の方法で評価した。その結果を表1に示す。   Each transparent paper obtained in Examples and Comparative Examples was evaluated as a sample by the following method. The results are shown in Table 1.

[評価方法]
<透気度>
JIS P8117 紙及び板紙−透気度試験方法−ガーレー試験機法に準じて測定した。 100000秒/100mLを超えるものは、>100000秒/100mLとした。
<変則フリーネス>
JIS P8121 パルプのろ水度試験方法 4.カナダ標準ろ水度試験方法に準じて測定した。ただし、試料濃度を0.03%とした。
<透明度>
ISO5−2に準拠し、拡散光透過率計DOT−5(村上色彩技術研究所社製)で測定を行った。
[Evaluation method]
<Air permeability>
It was measured according to JIS P8117 paper and paperboard-air permeability test method-Gurley tester method. Those exceeding 100,000 seconds / 100 mL were set to> 100,000 seconds / 100 mL.
<Anomaly Freeness>
3. JIS P8121 Pulp Freeness Test Method Measured according to the Canadian Standard Freeness Test Method. However, the sample concentration was 0.03%.
<Transparency>
Based on ISO5-2, the measurement was performed with a diffuse light transmittance meter DOT-5 (manufactured by Murakami Color Research Laboratory Co., Ltd.).

<白斑点ムラ>
透明紙の白斑点ムラ(透明性の均一性)を目視により評価した。
○:白斑点ムラがほとんど見られず、透明性の均一性に優れる。
△:白斑点ムラが僅かに見られる。
×:白斑点ムラが見られ、透明性の均一性に劣る。
<筆記性>
試料紙表面に、鉛筆、油性マジックインキで筆記した直後に、乾いたティッシュペーパーで拭き取り、こすれ汚れの発生を目視で評価した。
○:こすれ汚れは見られなかった。
△:少しこすれ汚れが発生した。
×:こすれ汚れがひどく、判読できなかった
<耐油性>
紙試料表面に植物油(日清オイリオ製 食用サラダ油)1mlを垂らし、7日後の紙裏面への裏抜けを目視評価した。紙試料5点を評価し、平均値を計算した。
○:裏抜けの発生は全く見られなかった。
△:植物油が滴下された部分に、点状の裏抜けが数箇所見られた
×:植物油が滴下された部分に広い面積で裏抜けが見られた
<White spot unevenness>
The white spots unevenness (transparency uniformity) of the transparent paper was visually evaluated.
○: White spot unevenness is hardly observed, and the uniformity of transparency is excellent.
Δ: Slight white spot unevenness is observed.
X: Unevenness of white spots is observed and the uniformity of transparency is inferior.
<Writing>
Immediately after writing on the surface of the sample paper with a pencil or oil-based magic ink, the sample paper was wiped off with a dry tissue paper, and the occurrence of rubbing stain was visually evaluated.
○: No rubbing dirt was seen.
Δ: Slightly rubbed and dirty.
×: The rubbing stain was severe and could not be read. <Oil resistance>
1 ml of vegetable oil (edible salad oil made by Nisshin Eulio) was dropped on the surface of the paper sample, and the see-through to the back of the paper after 7 days was visually evaluated. Five paper samples were evaluated and the average value was calculated.
○: No show-through occurred.
Δ: Several point-like strikethroughs were found in the part where the vegetable oil was dropped. X: Breakthroughs were seen in a wide area in the part where the vegetable oil was dropped.

Figure 2016074998
Figure 2016074998

実施例からも明らかなように、実施例1、及び2は透明度が極めて高く、白斑点ムラの少ない、即ち透明性が均一である優れた品質を具備するものであった。比較例1〜3は白斑点ムラが見られるために透明性の均一性に劣り、かつ所望する透明度を得ることはできなかった。   As is clear from the examples, Examples 1 and 2 have excellent quality with extremely high transparency, little white spot unevenness, that is, uniform transparency. Since Comparative Examples 1 to 3 showed white spot unevenness, the uniformity of transparency was inferior, and the desired transparency could not be obtained.

本発明の透明紙は、透明度が高く、かつ透明性の均一性に優れ、プラスチックフィルム等の置き換えに期待できる基材である。   The transparent paper of the present invention is a substrate having high transparency and excellent uniformity in transparency, and can be expected to replace a plastic film or the like.

Claims (4)

セルロースを主体とする原紙をパーチメント加工した透明紙であって、透明度が89%以上、密度が1.00g/cm以上であることを特徴とする透明紙。 A transparent paper obtained by parchment processing a base paper mainly composed of cellulose, having a transparency of 89% or more and a density of 1.00 g / cm 3 or more. JIS P8117:2009による透気度が100000秒/100mL以上であることを特徴とする請求項1に記載の透明紙。   2. The transparent paper according to claim 1, wherein the air permeability according to JIS P8117: 2009 is 100,000 seconds / 100 mL or more. 前記原紙の厚さが60μm以下であることを特徴とする請求項1〜2に記載の透明紙。   The transparent paper according to claim 1, wherein the base paper has a thickness of 60 μm or less. セルロースを主体とする原紙をパーチメント加工した透明紙の製造工程において、JIS P8117:2009による透気度が1000秒/100mL以上の原紙に(A)パーチメント加工工程、(B)乾燥工程を順次行うことを特徴とする、請求項1〜3に記載の透明紙の製造方法。 In the manufacturing process of transparent paper made by parchment of base paper mainly composed of cellulose, (A) parchment processing step and (B) drying step are sequentially performed on the base paper having air permeability of 1000 seconds / 100 mL or more according to JIS P8117: 2009 The manufacturing method of the transparent paper of Claims 1-3 characterized by these.
JP2014206018A 2014-10-06 2014-10-06 Transparent paper and method for producing the same Pending JP2016074998A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020170226A1 (en) * 2019-02-22 2020-08-27 Gimsa S.R.L. Recyclable composite material, in particular for food packaging
IT201900004121A1 (en) * 2019-02-22 2020-09-21 Gimsa S R L RECYCLABLE COMPOSITE MATERIAL, ESPECIALLY FOR FOOD PACKAGING
FR3135068A1 (en) * 2022-04-29 2023-11-03 Groupe Guillin cardboard packaging sealed with a cellulose or paper film, heat-sealed on a container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020170226A1 (en) * 2019-02-22 2020-08-27 Gimsa S.R.L. Recyclable composite material, in particular for food packaging
IT201900004121A1 (en) * 2019-02-22 2020-09-21 Gimsa S R L RECYCLABLE COMPOSITE MATERIAL, ESPECIALLY FOR FOOD PACKAGING
EP4306713A3 (en) * 2019-02-22 2024-03-20 Gimsa S.r.l. Recyclable composite material, in particular for food packaging
FR3135068A1 (en) * 2022-04-29 2023-11-03 Groupe Guillin cardboard packaging sealed with a cellulose or paper film, heat-sealed on a container

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