JP2008266823A - Hydrogel-coated japanese paper and apparatus for producing the same - Google Patents
Hydrogel-coated japanese paper and apparatus for producing the same Download PDFInfo
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Abstract
Description
本発明は、特に、湿度に弱い壁紙や金箔用裏打ち用紙等に最適な、新しいタイプのハイドロゲル塗工和紙及びその製造装置に関する。 The present invention relates to a new type of hydrogel-coated Japanese paper and a manufacturing apparatus therefor, which are particularly suitable for wallpaper that is sensitive to humidity, backing paper for gold foil, and the like.
和紙は、基本的にはコウゾ、ミツマタ等の繊維の絡みで構成されているため、繊維同士の隙間に水分を吸収したり、放散したりする性質がある。特に、和紙は長繊維のため繊維同士の隙間が大きく、より多くの水分を吸収し、放散する。 Japanese paper is basically composed of entanglements of fibers such as Kozo and Mitsumata, and therefore has the property of absorbing and diffusing moisture in the gaps between the fibers. In particular, Japanese paper is a long fiber, so the gap between the fibers is large, and it absorbs and dissipates more water.
上述の和紙の特性は、昔ながらの和紙の使用方法や、生活様式では、最大の利点であった。しかし、現在では、水分の吸水や放散によって繊維の伸縮が起きることや、水分を吸収し易いことで、次のような問題が起きている。
１） 壁紙施工後の継目のめくれ
２） 襖のそり
３） 紙製品の紙むけや変形
４） 結露によるカビの発生や、紙に含まれる異物(鉄分など)の酸化による変色
これらの問題は気候などの環境変化による要因が大きく、紙の中の水分を一定に保つことができないことが原因であることが知られている。
The above-mentioned characteristics of Japanese paper were the greatest advantage in traditional Japanese paper usage and lifestyle. However, at present, the following problems occur due to the expansion and contraction of fibers caused by the absorption and diffusion of moisture and the ease of absorbing moisture.
1) Seam turning after construction of wallpaper 2) Warp sled 3) Paper peeling and deformation 4) Molding due to condensation and discoloration due to oxidation of foreign substances (iron etc.) contained in paper It is known that the cause is that the moisture in the paper cannot be kept constant due to large factors due to environmental changes.
上述の問題点を解決するために、本発明者等は、カルボキシメチルセルロースやカルボキシメチルデンプンなどの高吸水性ハイドロゲル（例えば、特許文献１に記載のゲル）に着目し、これらの和紙への適用を試みた。これらの高吸水性ハイドロゲルは、その内部の橋かけ構造により、水分を素早く吸収するが、吸収した水分を逃さない性質も持っている。そこで、和紙にハイドロゲルを塗工する研究開発を行った結果（非特許文献１参照）、上述の４つの問題点をある程度解決できたものの、製品化にはまだ不十分であることがわかった。 In order to solve the above-mentioned problems, the present inventors focused on superabsorbent hydrogels such as carboxymethylcellulose and carboxymethyl starch (for example, the gel described in Patent Document 1), and applied these to Japanese paper. Tried. These superabsorbent hydrogels absorb moisture quickly due to the internal bridging structure, but also have a property of not absorbing the absorbed moisture. Therefore, as a result of research and development to apply hydrogel to Japanese paper (see Non-Patent Document 1), it was found that although the above four problems were solved to some extent, they were still insufficient for commercialization. .
すなわち、これまでの製造装置では、和紙にハイドロゲルを添加した後、ハイドロゲルを乾燥させる工程において、和紙が水分を吸収してしまうことがあるために、湿度に強いハイドロゲル塗工和紙を安定的に得ることが極めて困難であることがわかった。 In other words, with conventional manufacturing equipment, the hydrogel coated Japanese paper that is resistant to humidity can be stabilized because the Japanese paper may absorb moisture in the step of drying the hydrogel after adding the hydrogel to the washi. It was found to be extremely difficult to obtain.
そこで、本発明の目的は、湿度に強く、伸縮の小さいハイドロゲル塗工和紙及びそれを安定的に供給できる製造装置を提供することにある。 Accordingly, an object of the present invention is to provide a hydrogel-coated Japanese paper that is resistant to humidity and has a small amount of expansion and contraction, and a manufacturing apparatus that can stably supply it.
さらに、本発明の他の目的は、カビなどの発生を防ぐことができると共に、大腸菌などの細菌の繁殖も押さえることができる抗菌性のあるハイドロゲル塗工和紙及びその製造装置を提供することにある。 Furthermore, another object of the present invention is to provide an antibacterial hydrogel coated Japanese paper that can prevent the occurrence of mold and the like, and can also suppress the growth of bacteria such as Escherichia coli, and an apparatus for producing the same. is there.
本発明に係る和紙は、紙の両面に、内部に浸透するようにして高吸水性ハイドロゲルが塗工されている。紙の両面に、内部に浸透するようにして高吸水性のハイドロゲルを塗工することによって、和紙本体の吸水率を一定に保つことができ、和紙の欠点である湿度による伸縮を防止できる。 The Japanese paper according to the present invention is coated with a superabsorbent hydrogel so as to penetrate into both sides of the paper. By applying a highly water-absorbing hydrogel on both sides of the paper so as to penetrate inside, the water absorption rate of the Japanese paper main body can be kept constant, and expansion and contraction due to humidity, which is a drawback of Japanese paper, can be prevented.
本発明の別の観点に係る和紙は、抗菌剤を含む紙の両面に、内部に浸透するようにして高吸水性ハイドロゲルが塗工されている。抗菌剤としては、例えば放射線橋かけを行ったキトサンが有効である。 Japanese paper according to another aspect of the present invention is coated with a superabsorbent hydrogel on both sides of a paper containing an antibacterial agent so as to penetrate inside. As an antibacterial agent, for example, chitosan subjected to radiation crosslinking is effective.
また、本発明に係るハイドロゲル塗工和紙の製造装置は、以下の構成を持つ。すなわち、この製造装置は、和紙の原料等をローラによって引き伸ばし、薄板状に形成する抄紙機と、該抄紙機の次段に設置され、引き伸ばされた原料の少なくとも両表面にハイドロゲルを浸透させるため、２個の対称的に配置されたローラを有するプレス機と、前記プレス機の２個のローラが互いに協働する個所に、連続的に一定量のハイドロゲルが蓄積されるように、ハイドロゲルを供給するするゲル供給手段を備えている。このような構成をとることによって、上記段落に記載されたハイドロゲル塗工和紙を安定的に製造することができる。 Moreover, the manufacturing apparatus of the hydrogel coated Japanese paper which concerns on this invention has the following structures. That is, this manufacturing apparatus is a paper machine that stretches a raw material of Japanese paper with a roller and forms it into a thin plate shape, and is installed in the next stage of the paper machine to allow the hydrogel to permeate at least both surfaces of the stretched raw material. Hydrogel so that a certain amount of hydrogel is continuously accumulated in a press machine having two symmetrically arranged rollers and where the two rollers of the press machine cooperate with each other A gel supply means for supplying. By taking such a structure, the hydrogel coated Japanese paper described in the above paragraph can be stably produced.
本発明によって、ハイドロゲルを和紙の両面に塗工することで、従来の和紙とは全く性質の違った和紙が得られた。すなわち、今までの和紙にはなかった「水分安定性」のある和紙が得られた。また、抗菌剤を付加することで、これまでの和紙には存在しなかった「抗菌性を有する和紙」が得られた。 According to the present invention, Japanese paper having completely different properties from conventional Japanese paper was obtained by applying hydrogel on both sides of the Japanese paper. That is, Japanese paper with “moisture stability” that was not found in traditional Japanese paper was obtained. In addition, by adding an antibacterial agent, an “antibacterial Japanese paper” that was not present in Japanese paper was obtained.
以下、図面を参照しながら本発明の好適な実施形態について説明する。図１は、本発明の一実施形態に係るハイドロゲル塗工和紙の製造装置の概略図であり、図２は、抄紙工程、乾燥工程に続いて行われる、ハイドロゲルの塗工工程で使用される改良されたサイズプレス機の拡大図を示している。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an apparatus for producing hydrogel-coated Japanese paper according to an embodiment of the present invention, and FIG. 2 is used in a hydrogel coating process performed following a papermaking process and a drying process. 1 shows an enlarged view of an improved size press.
図１において、初めに、原料投入機１０に和紙の原料であるパルプ、コウゾ、ミツマタなどが適当量投入される。これの原料は原料調整機１２において、それぞれ適切な配分に調整され、必要な場合には、この段階で、色素、抗菌剤などの補助剤が添加されて、一緒に混合される。調整された原料は、原料貯蔵タンク１４に移送される。その後、原料は濃度調整機１６に送られ、水分調製が行われた後、ミキシングボックス１８に送られる。さらなる補助剤等を添加したい場合には、このミキシングボックス１８において添加される。その後、原料は抄紙機２０にかけられ抄紙され、乾燥機２２で乾燥させられる。
In FIG. 1, first, an appropriate amount of pulp, mulberry, mitsumata, and the like, which are raw materials for Japanese paper, are charged into a
乾燥させられた和紙は、次に、サイズプレス機すなわち塗工機２８によって、その両面に高吸水性ハイドロゲルが塗工される。このハイドロゲルは、事前に塗工液調整機２６において、適切な濃度に調整されて、塗工機２８に送られる。和紙は、この塗工機２８において、内部に浸透するようにしてその表面付近を塗工された後、乾燥機３０に送られ、ここで乾燥させられる。その後、最終製品として巻き取り機３２によって巻き取られる。以上で、和紙の両面塗工が完了する。
The dried Japanese paper is then coated with a superabsorbent hydrogel on both sides by a size press or
次に図２を参照して、改良されたサイズプレス機すなわち本発明に係る製造装置において使用される塗工機２８についてさらに詳細に説明する。塗工液調整機（図示せず）において、適切な粘度に調製されたハイドロゲルは、配管３４ａ及び３４ｂを介してローラの上部に供給される。配管３４ａ及び３４ｂは、それぞれローラ３８ａ及び３８ｂの軸方向に沿って長く延びている。供給されたハイドロゲルは、配管３４ａ及び３４ｂの軸方向に沿って均等に開けられた開口から図示のように、それぞれ受板３６ａ及び３６ｂに流れ出るようになっている。ハイドロゲルはこの受板３６ａ及び３６ｂによって、ローラ３８ａ及び３８ｂの軸方向全長に渡ってほぼ均一の厚さになるように配分される。その後、ハイドロゲルは受板３６ａ及び３６ｂからそれぞれローラ３８ａ及び３８ｂの表面に供給される。なお、供給されるハイドロゲルが、２つのローラが協働する位置において、常時一定量だけ溜まるように、ローラの回転速度に合わせてその供給量が調製されるようになっている。図中、符号１００は紙の流れを示し、波線はハイドロゲルの供給状態を模式的に表している。なお、上述の高吸水性ハイドロゲルは、背景技術において説明した特開２００３−４８９９７号公報に記載されたゲルと実質的に同一のゲルであっても良いし、カルボキシメチルセルロースゲルなどの他のゲルであっても良いことは、発明の原理から明らかである。
Next, the improved size press, that is, the
上述の塗工工程において、塗工液調整機（図示せず）での塗工に必要な均一に分散したハイドロゲル溶液の作成について説明する。溶液は均一に分散させる必要があることから、その粘度があまり高くならないように、１％溶液と、２％溶液を作成した。これらの溶液は、固形分１％と、２％を水によく分散させた後に、熱で煮込み、１日〜３日の間熟成させ、均一なハイドロゲル溶液とした。ここで、固形分２％でもかなりの粘度を持つため、固形分が２％よりも大きい場合には、固形分が残留するなどして、均一の溶液を作成することは困難である。 In the above-mentioned coating process, creation of a uniformly dispersed hydrogel solution necessary for coating with a coating liquid adjusting machine (not shown) will be described. Since the solution needs to be uniformly dispersed, a 1% solution and a 2% solution were prepared so that the viscosity was not so high. These solutions were well dispersed in water with 1% solids and 2%, then boiled with heat and aged for 1 to 3 days to obtain uniform hydrogel solutions. Here, since it has a considerable viscosity even at a solid content of 2%, when the solid content is larger than 2%, it is difficult to make a uniform solution because the solid content remains.
（２.０％溶液を塗工）
再び、図１及び図２を参照しながら、本発明者等が行った実施例について説明する。初めに、原料投入機１０に和紙の各種原料を投入し、原料調整機１２においてそれらの原料の配分を調整すると共に、ここで対重量比３％のキトサンを添加した。調整した原料を、原料貯蔵タンク１４に移送した後、濃度調整機１６に送り、原料の水分調製を行った。その後、抄紙機２０にかけて抄紙し、約１５０℃の蒸気を使用して乾燥機２２において乾燥させた。
(Apply 2.0% solution)
With reference to FIGS. 1 and 2 again, an embodiment performed by the present inventors will be described. First, various Japanese paper raw materials were charged into the raw
次に、抄紙した和紙の両面に、改良されたサイズプレス機２８を用いて、２％濃度の特開２００３−４８９９７号公報に記載の高吸水性デンプンゲルを塗工した。その後、両面塗工した和紙を乾燥機３０に送り、約１５０℃の蒸気を使用して加熱乾燥し、最終製品として巻き取り機３２によって巻き取った。
Next, a superabsorbent starch gel described in Japanese Patent Application Laid-Open No. 2003-48997 having a concentration of 2% was applied to both sides of the paper-made Japanese paper using an improved
その結果、図３から図６に示される特性を持つハイドロゲル塗工和紙が得られた。これらの特性から、高吸水性ハイドロゲルを和紙の両面に塗工することによって、特に浸水伸度、引張強度、表面強度において顕著な特性変化が見られた。 As a result, hydrogel-coated Japanese paper having the characteristics shown in FIGS. 3 to 6 was obtained. From these characteristics, when the superabsorbent hydrogel was applied to both sides of the Japanese paper, remarkable changes in characteristics were observed, particularly in terms of water immersion elongation, tensile strength, and surface strength.
（０.８％溶液を塗工）
製造の仕方は、実施例１と同様にして行った。
(Coating with 0.8% solution)
The manufacturing method was the same as in Example 1.
その結果、図７のような特性を有するハイドロゲル塗工和紙が得られた。このことから、０.８％溶液の塗布ではあまり効果が現れてはいないが、溶液濃度を１％以上とすれば、ある程度の効果があるものと考えられる。
（まとめ）
As a result, a hydrogel-coated Japanese paper having the characteristics shown in FIG. 7 was obtained. From this, application of the 0.8% solution is not very effective, but it is considered that if the solution concentration is 1% or more, there is some effect.
(Summary)
以上まとめると、図３から図７に示されるように、０.８％（図７参照）に比べ、２％（図３から図６参照）の方が浸水伸度、引張強度、表面強度で効果があつた。特に、浸水伸度では大きな効果があつた。今回の試験を行った和紙は、長繊維を多く配合した原料を使用した一般的な和紙であったにも関わらず、塗布前と塗布後では０.３％の差が生じた。原料に短繊維を多く配合するなどすることにより、浸水伸度０.５％〜０.６％が確保できるものと考える。 In summary, as shown in FIGS. 3 to 7, 2% (see FIG. 3 to FIG. 6) is higher in water immersion elongation, tensile strength, and surface strength than 0.8% (see FIG. 7). Effective. In particular, there was a great effect on the degree of water immersion. The Japanese paper that was tested this time was a general Japanese paper using a raw material containing a lot of long fibers, but there was a difference of 0.3% before and after coating. It is considered that a water immersion elongation of 0.5% to 0.6% can be secured by blending many short fibers with the raw material.
紙に水分が染みこみ易くした原紙(弱サイズ紙)にも塗工試験を行った結果、通常品に比べ、ゲル溶液が紙の内部にまで染み込んだために、普通紙より優れた結果が得られた。この場合、サイズ剤もゲルに混合し塗布することで、最大の効果が得られると考えられる。 As a result of conducting a coating test on base paper (weak size paper) that made water easily soaked into the paper, the gel solution soaked into the inside of the paper compared to the normal product, resulting in better results than plain paper. It was. In this case, it is considered that the maximum effect can be obtained by mixing and applying the sizing agent to the gel.
次に、上述の本発明に係る製造装置を用いて壁紙用和紙を製造した。２％のハイドロゲル溶液を塗工した製品の試験結果について、図８を用いて説明する。壁紙の専門メーカにて各種試験を行った結果、図８から明らかなように、本発明に係るハイドロゲル塗工和紙は、壁紙としての、防炎性能、防かび性、退色性、対摩擦性、隠ぺい性、湿潤強度、ホルムアルデヒド放出量、硫化汚染性及び施工性のいずれも、優れた特性を示した。 Next, Japanese paper for wallpaper was manufactured using the manufacturing apparatus according to the present invention described above. The test results of the product coated with the 2% hydrogel solution will be described with reference to FIG. As a result of various tests conducted by a wallpaper maker, as is apparent from FIG. 8, the hydrogel coated Japanese paper according to the present invention has a flameproof performance, antifungal property, fading property, and friction resistance as wallpaper. In addition, all of the concealability, wet strength, formaldehyde emission amount, sulfidation contamination and workability showed excellent characteristics.
新機能の和紙として、住宅内装用、装飾用等数多くの用途が期待されている。特に、本発明によって製造された製品は、紙に弾力性がある上に、水による紙の伸び縮みが少ないので、壁紙や金箔用裏打ち用紙に最適である。
また、キトサンを３％混合することで、抗菌作用もあることが確認できたので、一般的な用途とは別に、例えば病院等の抗菌壁紙や、鮮度保持用の紙袋や箱などへの利用も期待されている。
As a new Japanese paper, many uses such as interior decoration and decoration are expected. In particular, the product produced according to the present invention is suitable for wallpaper and gold foil backing paper because the paper is elastic and the paper does not stretch or shrink with water.
In addition, 3% chitosan was mixed to confirm that it also has antibacterial activity, so it can be used for antibacterial wallpaper in hospitals, paper bags and boxes for maintaining freshness, etc. Expected.
１０…原料投入機
１２…原料調整機
１４…原料貯蔵タンク
１６…濃度調整機
１８…ミキシングボックス
２０…抄紙機
２２…乾燥機
２４…巻き取り機
２６…塗工液調整機
２８…塗工機
３０…乾燥機
３２…巻き取り機
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| JPS60119290A (en) * | 1983-11-24 | 1985-06-26 | 山陽国策パルプ株式会社 | Size solution supply method and apparatus |
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