JP3541585B2 - Pulp mold - Google Patents

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Publication number
JP3541585B2
JP3541585B2 JP27639896A JP27639896A JP3541585B2 JP 3541585 B2 JP3541585 B2 JP 3541585B2 JP 27639896 A JP27639896 A JP 27639896A JP 27639896 A JP27639896 A JP 27639896A JP 3541585 B2 JP3541585 B2 JP 3541585B2
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Prior art keywords
pulp
water
mold
weight
pulp mold
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JPH10131099A (en
Inventor
順一郎 城戸
國明 大島
敏明 小林
和智 坂元
伊藤  剛
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New Oji Paper Co Ltd
Oji Holdings Corp
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Oji Holdings Corp
Oji Paper Co Ltd
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Description

【0001】
【発明の属する技術分野】本発明は、包装材料、緩衝材料等として使用される、耐水性に優れたパルプモールドに関する。
【0002】
【従来の技術】従来より各種緩衝材及び包装材として発泡スチロール又は塩化ビニール等の合成樹脂製品が、軽量低価格で成型性がよく、緩衝能力又は強度が優れている為各分野で広く使用されている。しかし使用した後の処理に際して、これら合成樹脂製品は、焼却処理では高熱を発して炉を傷めたり一部の有害ガスを発生するとされ、埋立処理では嵩ばる上に分解しないという問題があり、近年新聞紙、ダンボール等の古紙を原料としたパルプモールド製品が急速に普及してきた。パルプモールド製品は地球環境上の面からも今後、更に普及すべき材料であるが、耐水性に関しては未だ問題が残っている。
【0003】
この対策として、パルプを主成分とし、中空粒子(アクリロニトリル系樹脂を壁材としたマイクロカプセル)及び合成繊維、その他ロジン系サイズ剤、キトサン等の生分解性バインダー等を使用して、緩衝性、耐水性及び材料強度に優れたパルプモールドを得る提案(特開平6−10300)があるが、合成繊維を5〜30重量%配合し、又中空粒子もプラスチック系の類であり、使用後廃棄の際には、従来の発泡スチロールの場合程ではないまでも、やはり地球環境汚染上の問題を残し持っている。
【0004】
【発明が解決しようとする課題】かかる現状に鑑み本発明者等は、従来パルプモールド包装材料の耐水性対策として一般に採用されてきたサイズ剤単独内添方式では、到達出来なかった高サイズ度を目指し、湿潤紙力増強剤内添による耐水性向上及び撥水剤内添による耐水性向上について、鋭意研究を続けたが、湿潤紙力増強剤又は撥水剤を各々単独で内添使用するに比較し、両者を同時に併用内添する事で、一層顕著な高サイズ度と強力な耐水性を有するパルプモールドが得られる事を見い出し、本発明を完成させるに至った。
本発明の目的は、耐水性(水を吸収しにくい性質)に優れたパルプモールドを提供することである。
【0005】
【課題を解決する為の手段】本発明は、古紙を原料として用いるパルプモールドに於いて、絶乾パルプに対し、ポリアミドアミン・エピクロルヒドリン樹脂を0.2〜1.0重量%、ワックスエマルジョンを0.2〜1.0重量%含有することを特徴とするパルプモールドである。
【0006】
【発明の実施の形態】本発明においては、新聞古紙単独に限らず、その他チラシ古紙、上質コート古紙等を機械的解繊を行う離解装置によりスラリー状に溶解したパルプ原料溶液中へ、湿潤紙力増強剤と撥水剤を併用添加し、公知の湿式吸引成型法により成型後、熱風及び遠赤外線乾燥してパルプモールドを製造する。尚、パルプ原料溶液中に、更に、サイズ剤、染料、定着剤(硫酸バンド等)等を適宜併用添加してもよい。
【0007】
湿潤紙力増強剤はカチオン性で、パルプ繊維に自己定着してセルロースと架橋して、三次元的な網目構造をつくり、水の浸透を防止すると共に親水基を封鎖する為、湿潤紙力が発現する。また他の添加薬品等の定着剤の役目も果たす。撥水剤は、この様な網目構造の中にあって、文字通り水を弾き返す役割を果たす。また、サイズ剤は添加してもしなくて構わないが、パルプの親水基と結合し疎水性を持たせる働きがある。この様な薬剤を内添したパルプモールド成型品は容器状の形のものに水を入れても、水の滲み出しを長期間抑えられるものが出来る。
【0008】
湿潤紙力増強剤としては、内添用薬剤として、ポリアミドアミン・エピクロルヒドリン樹脂使用る。ポリアミドアミン・エピクロルヒドリン樹脂はポリマー骨格にアミン基を含む強カチオン性の薬剤で、自己定着性を持つので、酸性〜中性域で効果を発揮する。従って、パルプ原料溶液のPHが高い場合には適量の硫酸バンドを添加して、PHを中性領域(6〜7)に調整しておく事が好ましい。また、ポリアミドアミン・エピクロルヒドリン樹脂は、エポキシ環を側鎖にもつので、熱架橋性を有し、熱により不溶な網目構造をつくる。
【0009】
撥水剤としては、ワックスエマルジョン使用る。ワックスエマルジョンは、飽和脂肪酸をエマルジョン化したもので、水を弾き返す性質に特に優れている。
【0010】
湿潤紙力増強剤としてポリアミドアミン・エピクロルヒドリン樹脂を、撥水剤としてワックスエマルジョンを併用添加して得られるパルプモールドは耐水性の点で最も優れており、ポリアミドアミン・エピクロルヒドリン樹脂とワックスエマルジョンを、絶乾パルプに対し夫々固形分で0.2%以上内添したものは、3日間乃至一週間以上、水の滲み出し皆無の強力な耐水性を有する。
【0011】
湿潤紙力増強剤と撥水剤の内添率は、原料パルプ溶液中に、絶乾パルプに対して、固形分で、夫々0.2〜2.0重量%が適切であり、0.2重量%未満では耐水性が充分得られず、また2.0重量%を越えて添加しても効果が殆ど変わらず、無駄になるだけである。また、これらの薬剤は原料パルプ溶液中でパルプと反応するので、完成品における湿潤紙力増強剤と撥水剤の絶乾パルプに対する比率も内添率とほぼ同じで、夫々0.2〜2.0重量%である。さらに、湿潤紙力増強剤してポリアミドアミン・エピクロルヒドリン樹脂を、撥水剤としてワックスエマルジョンを使用する場合は、薬剤の効果が大きいので、絶乾パルプに対し夫々0.2〜1.0重量%とする。
【0012】
湿潤紙力増強剤と撥水剤の添加方法は、これらは共に水溶性の薬剤であるので、これら両者の内添は、サイズ剤同様パルプスラリー濃度調節後の成型機バット送りポンプのサクション側に、流量比率制御で定量ポンプにより送液配管内へ注入し添加率を安定させた上、送液ポンプの攪拌力を利用して混合すると添加しやすい。又、成型機バット内に於いても緩やかな攪拌を継続し混合及び反応を確実にする事が望ましい。
【0013】
【実施例】
以下に実施例を挙げて本発明をより具体的に説明するが、勿論本発明はこれらに限定されるものではない。尚、実施例及び比較例に於いて%とあるのは、特記のない限り全て重量%を示す。
実施例1〜4及び比較例1〜3に使用した薬剤を表1に列記して示す。
【0014】
【表1】

Figure 0003541585
【0015】
新聞古紙55%、チラシ(上質系、塗工紙系)古紙45%からなる離解パルプスラリー(未脱墨、未晒)を、パルプ濃度1.0%に調節し、パルプ、硫酸バンド、湿潤紙力増強剤、撥水剤を、表2に示すような配合割合で配合した。表2の配合数値は、絶乾パルプを100とした場合の重量比率を表す。このスラリーを湿式吸引成型装置(型式:SDM型,ノリタケカンパニー製)によりパルプモールド成型品とした。即ち、コンプレッサー部品包装用パルプモールド(横300mm×縦200mm×全高100mm)金型をバット内パルプスラリー中に浸漬して真空吸引し、パルプを金型成型面に積層吸着させた後、180゜回転させて吸着パルプを上にし、取り型に押し合わせて更に脱水した。その後、パルプを取り型から外して、熱風及び遠赤外線による乾燥を行い、水分7%厚み7mmのコンプレッサー部品包装用パルプモールド成型品を得た。
【0016】
【表2】
Figure 0003541585
【0017】
得られた各々のパルプモールド成型品(実施例1〜4及び比較例1〜3)について恒温恒湿槽を用い、吸湿試験を行った。吸湿率は事前に成型品の重量を測定した後、恒温恒湿槽(50℃、95%RH設定)で24時間エージング後、再度重量を測定し、その重量差から吸湿率として、(重量差)/(エージング前の重量)を算出したものである。サイズ度の測定は、実施例1〜4及び比較例1〜3の成型品製造の際、成型機のパルプスラリーバット内からサンプリングしたパルプを丸型シートマシン(JIS−8209−1976)により直径159mm、100g/m2相当品を作製し、KBBサイズテスター(熊谷理機工製JTAPPI No13−1977)を用いて、K.B.B.サイズ度を測定した。こうして得た吸湿率及びサイズ度測定結果を表3に示した。
【0018】
更に、得られたパルプモールド成型品(実施例1〜4及び、比較例1〜3)について、水を内底面から高さ80mmまで入れた状態で、モールドの耐水性を壁面からの水の滲み具合から観察した結果を、水濡れ試験として表3に示す。
尚、観察結果の記号の意味は、次の通りである。
◎:外面への水滲み出し皆無
○:外面の一部が僅かに湿り気味
△:外面全体に水の滲み出しあり
【0019】
また、パルプモールド成型品(実施例1〜4及び、比較例1〜3)に水を満たした状態で、モールド壁面からの水の滲み具合を上記の通り1週間観察した後で、内部の水を除去して再度恒温恒湿槽(110゜C、7%RH設定)で、24時間エージングして水濡れ圧縮強度試験用の乾燥調湿モールド成型品を得た。水濡れ圧縮強度試験は、ダンボール用圧縮試験機(東洋精機製)を使用し、圧縮強度試験前に、7個の試験用パルプモールド成型品を水平なコンクリート床上に、約50mm間隔をあけて包装面を下にして並べ、約3リットルの水をじょうろを使用して均一に降り注いだ後、3時間放置して試験前に人手により水を振り切った上で圧縮強度試験(座屈点を圧縮強度とし、座屈を起こした時の重量で表示する)を実施した。結果を表3に示す。
【0020】
【表3】
Figure 0003541585
【0021】
表3より、湿潤紙力増強剤と撥水剤の併用添加効果は、何れかの単独添加効果またはサイズ剤の単独添加効果に比較して、サイズ度、耐水性(水を吸収しにくい性質)の向上が顕著で、水に起因する圧縮強度低下抑制を著しく高める事が分かる。
【0022】
【発明の効果】本発明によれば、水濡れの際にも十分な圧縮強度と高サイズ度を有する、耐水性に優れたパルプモールドを得ることが出来る。これにより、本発明のパルプモールドは、包装材料等の用途において、発泡スチロールや塩化ビニール等の合成樹脂製品の代替品として使用することが可能となり、廃棄時の環境汚染の低減にも寄与出来る。[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulp mold having excellent water resistance, which is used as a packaging material, a cushioning material and the like.
[0002]
2. Description of the Related Art Conventionally, synthetic resin products such as styrofoam or vinyl chloride have been widely used in various fields as a cushioning material and a wrapping material because of their light weight, low cost, good moldability, and excellent cushioning capacity or strength. I have. However, during processing after use, these synthetic resin products are said to generate high heat in incineration processing and damage the furnace or generate some harmful gas, and there is a problem that they are bulky and do not decompose in landfill processing. Pulp mold products made from used paper such as newspaper and corrugated cardboard have rapidly become widespread. Although pulp mold products are materials that should be further spread in the future from the viewpoint of the global environment, problems still remain regarding water resistance.
[0003]
As a countermeasure, using pulp as a main component, hollow particles (microcapsules with acrylonitrile-based resin as wall material) and synthetic fibers, other rosin-based sizing agents, biodegradable binders such as chitosan, etc. There is a proposal to obtain a pulp mold having excellent water resistance and material strength (Japanese Patent Application Laid-Open No. 6-10300). However, synthetic fibers are blended in an amount of 5 to 30% by weight, and hollow particles are also of a plastic type. In this case, the problem of global environmental pollution still remains, though not so much as in the case of the conventional styrofoam.
[0004]
In view of this situation, the present inventors have developed a high sizing degree which cannot be attained by a sizing agent alone internal addition method generally used as a measure against water resistance of pulp mold packaging materials. Aiming at, we continued our research on improving the water resistance by adding a wet paper strength enhancer and the water resistance by adding a water repellent agent. By comparison, it was found that a pulp mold having a more remarkable high sizing degree and strong water resistance can be obtained by simultaneously adding both of them to the inside, thereby completing the present invention.
An object of the present invention is to provide a pulp mold excellent in water resistance (property of absorbing water).
[0005]
According to the present invention, there is provided a pulp mold using waste paper as a raw material , wherein a polyamidoamine / epichlorohydrin resin is contained in an amount of 0.2 to 1.0% by weight and a wax emulsion is contained in a dry pulp in an amount of 0.2 to 1.0% by weight. It is a pulp mold containing 0.2 to 1.0% by weight .
[0006]
DETAILED DESCRIPTION OF THE INVENTION In the present invention, not only newspaper waste paper but also flyer waste paper, high quality coated waste paper and the like are dissolved in a pulp raw material solution, which is dissolved in a slurry state by a disintegration apparatus for mechanically defibrating wet paper. A pulp mold is manufactured by adding a force enhancer and a water repellent in combination, forming the mixture by a known wet suction molding method, and then drying with hot air and far-infrared rays. In addition, a sizing agent, a dye, a fixing agent (such as a sulfuric acid band) and the like may be appropriately added to the pulp raw material solution.
[0007]
The wet paper strength enhancer is cationic and self-fixes to pulp fibers and crosslinks with cellulose to form a three-dimensional network structure, which prevents water penetration and blocks hydrophilic groups, thus increasing wet paper strength. Express. It also functions as a fixing agent such as other additive chemicals. The water repellent is in such a network structure and plays a role of literally repelling water. The sizing agent may or may not be added, but has a function of bonding to the hydrophilic group of the pulp and imparting hydrophobicity. A pulp molded article containing such an agent can suppress oozing of water for a long period of time even if water is poured into a container.
[0008]
The wet strength agent, as an internal添用agent, to use a polyamide-epichlorohydrin resin. The polyamidoamine / epichlorohydrin resin is a strong cationic agent containing an amine group in the polymer skeleton and has a self-fixing property, so that it is effective in an acidic to neutral range. Therefore, when the pH of the pulp raw material solution is high, it is preferable to adjust the pH to a neutral region (6 to 7) by adding an appropriate amount of a sulfuric acid band. In addition, the polyamidoamine / epichlorohydrin resin has an epoxy ring on the side chain, has a thermal crosslinkability, and forms a network structure insoluble by heat.
[0009]
The water repellent to use a wax emulsion. A wax emulsion is an emulsion of a saturated fatty acid, and is particularly excellent in repelling water.
[0010]
The pulp mold obtained by adding a polyamidoamine / epichlorohydrin resin as a wet paper strength enhancer and a wax emulsion as a water repellent is the most excellent in terms of water resistance. The pulp containing 0.2% or more of solid content with respect to the dry pulp has strong water resistance without exuding water for 3 days to 1 week or more.
[0011]
The internal addition ratio of the wet paper strength enhancer and the water repellent is preferably 0.2 to 2.0% by weight in solid content in the raw pulp solution with respect to the absolutely dry pulp. If the amount is less than 20% by weight, sufficient water resistance cannot be obtained, and if the amount exceeds 2.0% by weight, the effect is hardly changed, and it is just wasteful. Further, since these chemicals react with the pulp in the raw material pulp solution, the ratio of the wet paper strength enhancer and the water repellent to the absolutely dry pulp in the finished product is almost the same as the internal addition ratio. 0.0% by weight. Furthermore, the polyamide-epichlorohydrin resin as a wet strength agent, when using the wax emulsion as water-repellent agent has a large effect of the drug, each to the bone dry pulp s 0.2-1.0 weight %.
[0012]
The method of adding the wet paper strength enhancer and the water repellent is that they are both water-soluble chemicals, so the internal addition of both is carried out on the suction side of the molding machine bat feed pump after adjusting the pulp slurry concentration like the sizing agent. In addition, it is easy to add by injecting into a liquid sending pipe by a quantitative pump with flow rate ratio control and stabilizing the addition rate, and mixing using the stirring force of the liquid sending pump. It is also desirable to maintain gentle stirring even in the molding machine vat to ensure mixing and reaction.
[0013]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples, but of course, the present invention is not limited thereto. In Examples and Comparative Examples, “%” means “% by weight” unless otherwise specified.
The drugs used in Examples 1 to 4 and Comparative Examples 1 to 3 are listed and shown in Table 1.
[0014]
[Table 1]
Figure 0003541585
[0015]
Disintegrated pulp slurry (undeinked, unbleached) consisting of 55% used newspaper and 45% flyer (high quality, coated paper) waste paper was adjusted to a pulp concentration of 1.0%, and pulp, sulfuric acid band, wet paper The force enhancer and the water repellent were blended at the blending ratios shown in Table 2. The compounding numerical values in Table 2 represent the weight ratio when absolutely dry pulp is 100. This slurry was formed into a pulp molded product by a wet suction molding device (model: SDM type, manufactured by Noritake Company). That is, a pulp mold for packing compressor parts (300 mm wide x 200 mm long x 100 mm total height) is immersed in pulp slurry in a vat, vacuum sucked, and the pulp is laminated and adsorbed on the mold forming surface, and then rotated 180 °. Then, the adsorbed pulp was put on the upper side, and pressed against a mold to further dehydrate. Thereafter, the pulp was removed from the mold, and dried with hot air and far-infrared rays to obtain a molded pulp product for packaging compressor parts having a moisture content of 7% and a thickness of 7 mm.
[0016]
[Table 2]
Figure 0003541585
[0017]
Each of the obtained pulp molded products (Examples 1 to 4 and Comparative Examples 1 to 3) was subjected to a moisture absorption test using a thermo-hygrostat. The moisture absorption was measured in advance by measuring the weight of the molded product, then aging for 24 hours in a thermo-hygrostat (50 ° C., 95% RH setting), and again measuring the weight. ) / (Weight before aging). In the measurement of the degree of size, the pulp sampled from the inside of the pulp slurry vat of the molding machine at the time of manufacturing the molded products of Examples 1 to 4 and Comparative Examples 1 to 3 was 159 mm in diameter by a round sheet machine (JIS-8209-1976). to prepare a 100 g / m 2 equivalent, using KBB size tester (Makoto Kumagaya Kiko made JTAPPI No13-1977), K. B. B. The degree of sizing was measured. Table 3 shows the results of the measurement of the moisture absorption and the sizing degree thus obtained.
[0018]
Further, with respect to the obtained pulp mold molded products (Examples 1 to 4 and Comparative Examples 1 to 3), the water resistance of the mold was determined by immersing water from the wall surface in a state where water was poured from the inner bottom surface to a height of 80 mm. The results observed from the condition are shown in Table 3 as a water wetting test.
The meanings of the symbols in the observation result are as follows.
◎: No water seeping out to the outer surface ○: Part of the outer surface is slightly wet Δ: Water seeping out to the entire outer surface [0019]
Further, in a state where the pulp molded products (Examples 1 to 4 and Comparative Examples 1 to 3) were filled with water, the state of bleeding of water from the mold wall surface was observed for one week as described above, and then water inside the pulp mold was observed. Was removed and aged again for 24 hours in a thermo-hygrostat (110 ° C., 7% RH setting) to obtain a dry and humidity-controlled molded product for a water wet compressive strength test. The water wet compressive strength test uses a cardboard compression tester (manufactured by Toyo Seiki Co., Ltd.) and packs 7 test pulp molded products on a horizontal concrete floor with an interval of about 50 mm before the compressive strength test. After laying down face down, pour approximately 3 liters of water uniformly using a watering can, leave it for 3 hours, shake off water by hand before the test, And expressed by the weight when buckling occurred). Table 3 shows the results.
[0020]
[Table 3]
Figure 0003541585
[0021]
As shown in Table 3, the combined effect of the wet paper strength enhancer and the water repellent was compared with the effect of the single additive or the single additive of the sizing agent in terms of sizing degree and water resistance (the property of hardly absorbing water). It can be seen that the improvement in compression strength is remarkable, and the suppression of the decrease in compressive strength due to water is significantly increased.
[0022]
According to the present invention, it is possible to obtain a pulp mold having sufficient compressive strength and high sizing degree even when wet with water and excellent in water resistance. Accordingly, the pulp mold of the present invention can be used as a substitute for synthetic resin products such as styrene foam and vinyl chloride in applications such as packaging materials, and can contribute to reduction of environmental pollution at the time of disposal.

Claims (1)

古紙を原料として用いるパルプモールドに於いて、絶乾パルプに対し、ポリアミドアミン・エピクロルヒドリン樹脂を0.2〜1.0重量%、ワックスエマルジョンを0.2〜1.0重量%含有することを特徴とするパルプモールド。A pulp mold using waste paper as a raw material, characterized in that it contains 0.2 to 1.0% by weight of a polyamidoamine / epichlorohydrin resin and 0.2 to 1.0% by weight of a wax emulsion based on absolutely dried pulp. And pulp mold.
JP27639896A 1996-10-18 1996-10-18 Pulp mold Expired - Fee Related JP3541585B2 (en)

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JP4872144B2 (en) * 1999-08-24 2012-02-08 凸版印刷株式会社 Water resistant paper, method for producing the same, and paper container
JP4872145B2 (en) * 1999-12-10 2012-02-08 凸版印刷株式会社 Water-resistant paper and paper container using modified pulp fiber and modified cellulose powder
JP2002266300A (en) * 2001-03-13 2002-09-18 Fuji Corn Seisakusho:Kk Molded vessel for food product and the like
JP4551098B2 (en) * 2004-02-19 2010-09-22 北越紀州製紙株式会社 Combination paper with both water-repellent and water-absorbing layers
WO2017187556A1 (en) * 2016-04-27 2017-11-02 日本たばこ産業株式会社 Flavor inhaler

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JPS5215605A (en) * 1975-07-24 1977-02-05 Saiden Kagaku Kk Process for strengthened and sized paper
JPS5365403A (en) * 1976-11-24 1978-06-10 Saiden Kagaku Kk Production of neutral sized paper
JPS57146296A (en) * 1981-03-05 1982-09-09 Jujo Paper Co Ltd Flake-shaped cellulose heat insulated soundproof material and manufacture thereof
JPH01225684A (en) * 1988-03-04 1989-09-08 Nippon Seirou Kk Composition for imparting water repellency to particle board
JP3577089B2 (en) * 1992-11-20 2004-10-13 株式会社常盤電機 Manufacturing method of non-combustible sheet
JP2573142B2 (en) * 1993-05-14 1997-01-22 本州製紙株式会社 Packaging material
JPH07155588A (en) * 1993-12-08 1995-06-20 Hayashi Seisakusho:Kk Compacted adsorptive body
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