【０００１】
【発明の属する技術分野】
本発明は紙製立体物の製造方法に関するものであり、より詳しくは、嵩密度が小さく軽量で、室内の立体オブジェや商品展示ディスプレイ、壁材、商品輸送用緩衝材などとして利用可能な紙製立体物の製造方法に関するものである。
【０００２】
【従来の技術】
従来のかかる紙製立体物の製造方法としては、パルプまたは紙の解繊したものや裁断、破砕したものを粉末状あるいは繊維状の熱可塑性樹脂と混合した後成形型内で加熱圧縮成形する方法（例えば特許文献１参照）や、微小紙材に粉末状の生分解性樹脂をまぶした後加熱圧縮冷却して成形する方法（例えば特許文献２参照）、裁断した紙片を、水や希釈した接着剤を噴霧する装置を設けた型枠内に供給し、同時に水や接着剤を噴霧して紙片に付着させて、型内に積層した後、加熱圧縮成形する方法（例えば特許文献３参照）や、しわ付けを施した紙片に樹脂を含浸、塗布したのち加熱圧縮成形する方法（例えば特許文献４参照）が提案されている。
【０００３】
【特許文献１】
特開２００２−２９４５４３号公報、（特許請求の範囲）
【特許文献２】
特開平１０−３６５５０号公報、（特許請求の範囲）
【特許文献３】
特開平６−５６１７２号公報、（特許請求の範囲）
【特許文献４】
特許第３１８９００８号公報、（特許請求の範囲）
【０００４】
【発明が解決しようとする課題】
しかしながら、上述した特開２００２−２９４５４３号公報や特開平１０−３６５５０号公報に記載の製造方法によると、裁断した紙片と熱可塑性／熱可塑性生分解性樹脂を均一に混合しても、型枠内では重力により紙片間の空隙より熱可塑性／熱可塑性生分解樹脂粉末が紙片表面から脱落して均一に成型させることは困難である。脱落させないためには紙片の平面を積層状態にする必要があるため、低密度の成形体が得られなかった。
【０００５】
また、特開平６−５６１７２号公報記載の方法によると、特殊な成形型を必要とすることに加えて、バインダーとして澱粉やセルロース誘導体等の水溶性高分子を用いる場合には、これらの高濃度溶液は粘性が強くて均等に噴霧することが困難ある。そのため、低濃度溶液にせざるを得ず、紙片に水を大量含ませることとなるので、製品の低密度化が困難となり、また乾燥にも手間がかかるという問題があった。
【０００６】
また、特許３１８９００８号公報に記載の方法によると、紙片全体にバインダーがしみこんだ状態または紙片の全体を覆うため、紙本来の表面状態や質感、性質の損なわれた成形体しか製造できないという不具合があった。
【０００７】
本発明は以上のような課題に鑑み鋭意開発されたものであり、その目的は、嵩密度が小さくて軽く、室内の立体オブジェや商品展示ディスプレイ、壁材、商品輸送用緩衝材などとして利用可能な紙製立体物を、特殊な設備を必要とせず簡単に製造できる製造方法を提供するにある。
【０００８】
【課題を解決するための手段】
上記課題を解決するために本発明が採用した手段は、請求項１の発明は、均一に含水させた短冊状原料紙の表面に、粉末状の水溶性バインダーを略均一に分散、付着させた後、成形型内に入れ加熱・加圧することにより成形する工程を有するところに特徴を有する紙製立体物の製造方法を、その要旨とする。
【０００９】
請求項２の発明は、請求項１記載の製造方法において、前記原料紙１００重量部に対して水を５０〜１５０重量部の割合で含水させるものを、その要旨とする。
【００１０】
請求項３の発明は、請求項１又は２に記載の製造方法において、前記水溶性バインダーが、前記紙製立体物１００重量部に対して５〜２０重量部の割合で含まれているものを、その要旨とする。
【００１１】
請求項４の発明は、請求項１〜３のいずれかに記載の紙製立体物の製造方法において、前記紙製立体物の嵩密度が０．０７〜０．２０ｇ／ｃｍ３であるものを、その要旨とする。
【００１２】
【発明の実施の形態】
本発明に係る紙製立体物（成形体）は、原料紙をシュレッダーや裁断機により適宜寸法の短冊形状に裁断し、その裁断した短冊状の紙片を適当な容器中にて撹拌しながら所定量の水を噴霧するなどして短冊状の紙片に均一に水分を含ませた後、撹拌等をしながら粉末状の水溶性バインダーをそのまま加えて、短冊状の原料紙片表面に粉末状水溶性バインダーを均一に分散した状態で付着させ、ついで成形型内に入れ加圧加熱して立体形状に成形するものである。ただし、原料紙を限定するものではなく、バージンペーパーや古紙（オフィス古紙、新聞、雑誌等）、或いは、これら２種以上の混合物など何でも構わない。
【００１３】
紙片への含水量は、原料紙１００重量部に対して５０〜１５０重量部、好ましくは７５〜１００重量部であり、含水量が７５重量部以下であると、水溶性バインダーの紙表面への付着が不十分になるばかりか、水に溶解できないバインダーが残るため良好な成形状態が得られない傾向がある。また、１００重量部以上であると、乾燥に手間どることに加えて、成形型内に紙片を収容する前に水溶性バインダーが水に溶解して粘着性が強くなり過ぎてその取り扱いが困難になるばかりか、紙片を成形型内へ均一に入れることも困難となり均一な組織を有する成形体を成形し難く、また、紙片が柔軟になりすぎて成形時に自重で紙片同士が重なり合い、その結果、成形型への紙片充填量を低減化し難く、軽量な成形体を製造し難い傾向がある。
【００１４】
前記粉末水溶性バインダーとしては、紙の接着用として利用しうる粉末状の天然及び合成のあらゆる水溶性糊剤が含まれる。すなわち、紙片に含まれる水に溶解し、あるいは加熱により溶解または糊化し、さらに水の蒸発により接着性を発現するものであり、より具体的には、例えば澱粉およびアルファ化澱粉、可溶性澱粉等の澱粉誘導体、ガゼイン、セルロース誘導体、ポリビニルアルコール等で、これらを単独または数種の混合物などを挙げることができる。
【００１５】
なお、バインダーが粉末状であるため、紙片とバインダーの混合が容易であるとともに、成形時の初期含水量を低減できるため、乾燥手間を低減できる（コストの削減ができる）。また、水使用量が少ないので、廃水がほとんど発生しないため環境負荷が少ない。
【００１６】
また、バインダーは紙片の表面全体を覆うわけではなく均一分散されて点在するため、紙本来の持つ表面状態や質感、性質を損なうことがない。
【００１７】
粉末水溶性バインダーの添加量としては、乾燥後の成形体１００重量部に対し５〜２０重量部、好ましくは８〜１５重量部、含まれるようにすることが好ましい。１５重量部以上ではコストの増加となり、また、８重量部以下では充分な成形体が得られない傾向がある。
【００１８】
紙製立体物（立体成形体）は、用いる紙の種類、特に古紙を用いた場合は元の紙の種類や印刷、また短冊状の紙の大きさにより、多様な表面状態に成形できるので、例えば、展示ケースや室内等のオブジェ、ディスプレイ等としても利用できるほか、嵩密度を０．０７〜０．２０ｇ／ｃｍ３程度にまで調整可能であるため、商品輸送用の緩衝材や商品の支持固定材としても利用できる。なお、最終製品たる紙製立体物の用途を特にこれらに限定するものではない。
【００１９】
以下、紙製立体物（成形体）を実施例に基づいてさらに詳細に説明するが、以下の実施例により本発明が限定されるものではない。
【００２０】
【実施例１】
Ａ４版の事務用紙古紙（原料紙）を、市販のシュレッダーを用いて、幅４ｍｍに断裁して短冊状の紙片を得た。この紙片１００．８ｇを容器内に収容し、撹拌下、水１００．８ｇを噴霧して加え、短冊状の紙全体に均一に水分を含水させた後、ついで、撹拌しながら、粉末アルファ化澱粉１１．２ｇを加えて、紙片全体にアルファ化澱粉を均一に分散させた状態に付着させた。
【００２１】
ついで、この紙片を、直径約３ｍｍ透孔多数を有するステンレス板（厚さ３ｍｍ）を箱形に組み合わせてなる成形型に充填し、成形体が所定厚さとなるように加圧したまま１００℃の熱風循環乾燥器内に成形型ごと収容し、加熱乾燥した。
【００２２】
乾燥済み成形体を成形型から取り出し、さらに、乾燥器内で加熱乾燥させることで、縦横２００ｍｍで高さ４０ｍｍ、嵩密度０．０７ｇ／ｃｍ３の紙製立体物（成形体）を製造した。
【００２３】
【実施例２】
漫画雑誌古紙（原料紙）を断裁機を用いて７ｘ１５０ｍｍに断裁して短冊状の紙片を得、この紙片２１６ｇを容器内に収容し、撹拌下、水１６２ｇを噴霧し、紙片全体に均一に含水させた。ついで、撹拌しながら、コーンスターチ１２ｇとアルファ化澱粉粉末１２ｇを加え、短冊状の紙片全体にコーンスターチとアルファ化澱粉を均一に分散させた状態で付着させた。
【００２４】
ついで、この紙片を、直径約３ｍｍの透孔を多数設けたステンレス板（厚さ３ｍｍ）を箱形に組み合わせて成る成形型に入れ加圧し、そのまま成形型ごと１２０℃の熱風循環乾燥器内にて加熱乾燥した後、成形体を型から取りだしさらに乾燥器内で加熱乾燥させ、縦横２００ｍｍで高さ４０ｍｍ、嵩密度０．１５ｇ／ｃｍ３の紙製立体物を製造した。
【００２５】
【実施例３】
事務用紙古紙（原料紙）を断裁機を用いて幅２０ｍｍ、長さ２００ｍｍに断裁した短冊状の紙片を得、この紙片１４４ｇを容器内に収容し、撹拌下、水１００．５ｇのを噴霧して紙片全体に水分を含ませた。ついで、撹拌しながら、アルファ澱粉粉末１６ｇを加えて、紙片全体にアルファ化澱粉を均一に分散させた状態で付着させた。
【００２６】
ついで、この紙片を、直径約３ｍｍの透孔を多数設けたステンレス板（厚さ３ｍｍ）を箱形に組み合わせて成る成形型に入れ加圧し、そのまま成形型ごと１２０℃の熱風循環乾燥器内にて加熱乾燥した後、成形体を型から取りだしさらに乾燥器内で加熱乾燥させ、縦横２００ｍｍで高さ４０ｍｍ、嵩密度０．１０ｇ／ｃｍ３の紙製立体物を製造した。
【００２７】
【実施例４】
段ボールライナー原紙（原料紙）を断裁機を用いて幅７ｍｍ、長さ１５０ｍｍに断裁した短冊状の紙片を得た。この紙片２１６ｇを容器内に収容し、撹拌下、水２１６ｇを噴霧して加え、紙片全体に水分を含ませた。ついで、撹拌しながら、アルファ化澱粉粉末２４ｇを加え、紙片全体にアルファ化澱粉を均一に分散させた状態で付着させた。
【００２８】
ついで、この紙片を、直径約３ｍｍの透孔を多数設けたステンレス板（厚さ３ｍｍ）を箱形に組み合わせて成る成形型に入れ加圧し、そのまま成形型ごと１２０℃の熱風循環乾燥器内にて加熱乾燥した後、成形体を型から取りだしさらに乾燥器内で加熱乾燥させ、縦横２００ｍｍで高さ４０ｍｍ、嵩密度０．１５ｇ／ｃｍ３の紙製立体物を製造した。
【００２９】
【実施例５】
漫画雑誌古紙（原料紙）を断裁機を用いて幅７ｍｍ、長さ１５０ｍｍに断裁した短冊状の紙片を得た、この紙片２８８ｇを容器内に収容し、撹拌下、水２１６ｇを噴霧して加え、紙片全体に水分を含ませた。ついで、撹拌しながら、アルファ化澱粉粉末３２ｇを加え、紙片全体にアルファ化澱粉を均一に分散させた状態で付着させた。
【００３０】
ついで、この紙片を、直径約３ｍｍの透孔を多数設けたステンレス板（厚さ３ｍｍ）を箱形に組み合わせて成る成形型に入れ加圧し、そのまま成形型ごと１２０℃の熱風循環乾燥器内にて加熱乾燥した後、成形体を型から取りだしさらに乾燥器内で加熱乾燥させ、縦横２００ｍｍで高さ４０ｍｍ、嵩密度０．２０ｇ／ｃｍ３の紙製立体物を製造した。
【００３１】
上記実施例１〜５の紙製立体物は、紙本来の持つ質感、風合いがあり、原料紙の種類や色、模様等により視覚的に様々な表面状態がみられ、表面に特別な装飾や包装等を行わなくとも、紙のソフトな感覚を醸し出す、室内や展示ケース内等のオブジェ、ディスプレイ等として利用できる。また、０．０７〜０．２０ｇ／ｃｍ２までの密度制御による緩衝設計も可能であるため、緩衝材としても利用できた。
【００３２】
【発明の効果】
以上、本発明の紙製立体物の製造方法によると、
（１） 使用原料は再パルプ化を必要とせず、単に短冊状に裁断するのみであるため、パルプ化装置を必要としない。
（２） また、紙製立体物の嵩密度を、０．０７〜０．２０ｇ／ｃｍ３程度の低密度に成形来る。
（３） 原料紙として古紙を利用することができ、古紙のリサイクル用途拡大に寄与でき、また、特に天然系バインダーを用いれば、廃棄後の環境負荷が少ない。
（４） 従来の方法に比べて水使用量が少なく、排水にかかるコストや乾燥に係るコストを低減が可能となる。
（５） 紙製立体物は、短冊状の紙同士が粉末状のバインダーにより点接着されているため、紙本来の持つ質感や風合い、物性を損なうことがない。
（６） 原料紙として古紙を用いた場合には、原紙の種類や印刷、短冊紙片の寸法形状などにより、多様な表面状態に成型できるため、、展示ケースや室内等のオブジェ、ディスプレイ等としても利用でき、さらに、商品輸送用の緩衝材や商品の支持固定材としても利用できる。
等、実効性に優れた作用効果を奏するのである。
【図面の簡単な説明】
【図１】図１は、本発明の製造方法を概略的に示すブロック図である。
【符号の説明】
１ 原料紙
３ 紙片
５ 粉末バインダー
７ 成形型
１０ 紙製立体物[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a three-dimensional article made of paper. More specifically, the present invention relates to a paper-made article having a small bulk density and light weight, which can be used as an indoor three-dimensional object, a product display, a wall material, a cushioning material for product transportation, and the like. The present invention relates to a method for producing a three-dimensional object.
[0002]
[Prior art]
As a conventional method for producing such a paper three-dimensional object, a method in which defibrated or cut or crushed pulp or paper is mixed with a powdery or fibrous thermoplastic resin and then heated and compression-molded in a molding die. (For example, see Patent Document 1), a method in which fine biodegradable resin is coated on a fine paper material, and then heated, compressed and cooled (see, for example, Patent Document 2). A method of spraying water or an adhesive onto a piece of paper by spraying the same into a mold provided with a device for spraying an agent, and laminating in a mold, followed by heat compression molding (for example, see Patent Document 3). A method has been proposed in which a resin piece is impregnated and applied to a wrinkled piece of paper and then heated and compression-molded (for example, see Patent Document 4).
[0003]
[Patent Document 1]
JP-A-2002-294543, (Claims)
[Patent Document 2]
JP-A-10-36550, (Claims)
[Patent Document 3]
JP-A-6-56172, (Claims)
[Patent Document 4]
Japanese Patent No. 3189008, (Claims)
[0004]
[Problems to be solved by the invention]
However, according to the production methods described in JP-A-2002-294543 and JP-A-10-36550, even if the cut paper piece and the thermoplastic / thermoplastic biodegradable resin are uniformly mixed, the mold is In the inside, it is difficult for the thermoplastic / thermoplastic biodegradable resin powder to fall off the surface of the paper piece from the gap between the paper pieces due to gravity and to be uniformly molded. In order to prevent the molded product from falling off, it is necessary to make the planes of the paper pieces in a laminated state, so that a low-density molded product could not be obtained.
[0005]
According to the method described in JP-A-6-56172, in addition to the need for a special mold, when a water-soluble polymer such as starch or a cellulose derivative is used as a binder, the high concentration The solution is so viscous that it is difficult to spray it evenly. For this reason, a low-concentration solution must be used, and a large amount of water is contained in the paper piece. Therefore, it is difficult to reduce the density of the product, and there is a problem that it takes time to dry the product.
[0006]
In addition, according to the method described in Japanese Patent No. 3189008, since the binder is soaked in the entire paper piece or covers the entire paper piece, there is a problem that only a molded article having impaired original surface condition, texture and properties of the paper can be manufactured. there were.
[0007]
The present invention has been developed intensively in view of the above-mentioned problems, and its purpose is to have a small bulk density and light weight, and can be used as an indoor three-dimensional object, a product display, a wall material, a cushioning material for product transportation, and the like. It is an object of the present invention to provide a manufacturing method which can easily manufacture a simple three-dimensional article made of paper without requiring special equipment.
[0008]
[Means for Solving the Problems]
Means adopted by the present invention to solve the above-mentioned problem is that, in the invention of claim 1, a powdery water-soluble binder is substantially uniformly dispersed and adhered to the surface of a strip-shaped raw paper uniformly impregnated with water. A method of manufacturing a three-dimensional article made of paper, which is characterized in that it has a step of forming by heating and pressurizing in a molding die, and has a gist thereof.
[0009]
According to a second aspect of the present invention, in the manufacturing method of the first aspect, water is contained in a proportion of 50 to 150 parts by weight with respect to 100 parts by weight of the raw material paper.
[0010]
The invention according to claim 3 is the method according to claim 1 or 2, wherein the water-soluble binder is contained in a proportion of 5 to 20 parts by weight with respect to 100 parts by weight of the three-dimensional article made of paper. , And its gist.
[0011]
According to a fourth aspect of the present invention, in the method for producing a three-dimensional paper product according to any one of the first to third aspects, the bulk density of the three-dimensional paper product is 0.07 to 0.20 g / cm 3. , And its gist.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The paper three-dimensional object (molded product) according to the present invention is obtained by cutting a raw material paper into a strip shape having an appropriate size using a shredder or a cutting machine, and stirring the cut strip-shaped piece of paper in a suitable container by a predetermined amount. Water is evenly applied to the strip of paper by spraying water, etc., and the powdered water-soluble binder is added as it is while stirring, etc., and the powdered water-soluble binder is added to the surface of the strip of raw paper. Are adhered in a uniformly dispersed state, and then placed in a mold and heated under pressure to form a three-dimensional shape. However, the raw material paper is not limited, and any material such as virgin paper, waste paper (office waste paper, newspaper, magazine, or the like), or a mixture of two or more of these may be used.
[0013]
The water content in the paper piece is 50 to 150 parts by weight, preferably 75 to 100 parts by weight, based on 100 parts by weight of the raw paper, and when the water content is 75 parts by weight or less, the water-soluble binder Not only the adhesion becomes insufficient, but also a binder which cannot be dissolved in water remains, so that there is a tendency that a good molding state cannot be obtained. On the other hand, when the amount is more than 100 parts by weight, in addition to the trouble of drying, the water-soluble binder dissolves in water before the paper piece is stored in the mold, and the tackiness becomes too strong, so that the handling becomes difficult. Not only that, it is also difficult to uniformly insert the paper pieces into the mold, and it is difficult to form a molded body having a uniform structure.Moreover, the paper pieces become too flexible and overlap with each other by their own weight during molding. There is a tendency that it is difficult to reduce the amount of paper pieces filled in the mold and to manufacture a lightweight molded body.
[0014]
The powdered water-soluble binder includes all powdered natural and synthetic water-soluble pastes that can be used for bonding paper. That is, it dissolves in water contained in paper pieces, or dissolves or gelatinizes by heating, and further expresses adhesiveness by evaporating water. More specifically, for example, starch and pregelatinized starch, soluble starch, etc. Starch derivatives, casein, cellulose derivatives, polyvinyl alcohol and the like, which may be used alone or in combination of several kinds.
[0015]
In addition, since the binder is in powder form, mixing of the paper piece and the binder is easy, and the initial moisture content at the time of molding can be reduced, so that drying time can be reduced (cost can be reduced). Also, since the amount of water used is small, little wastewater is generated, so that the environmental load is small.
[0016]
Also, the binder does not cover the entire surface of the paper piece but is dispersed uniformly and scattered, so that the surface condition, texture and properties inherent to the paper are not impaired.
[0017]
The amount of the powdered water-soluble binder to be added is preferably 5 to 20 parts by weight, more preferably 8 to 15 parts by weight, based on 100 parts by weight of the dried compact. If the amount is more than 15 parts by weight, the cost increases, and if it is less than 8 parts by weight, a sufficient molded body tends to be not obtained.
[0018]
Paper three-dimensional objects (three-dimensional molded objects) can be formed into various surface conditions depending on the type of paper used, especially when used paper, the type and printing of the original paper, and the size of the strip-shaped paper. For example, it can be used as an object, a display, etc. in a display case or a room, and the bulk density can be adjusted to about 0.07 to 0.20 g / cm 3. It can also be used as a fixing material. In addition, the use of the paper three-dimensional object as the final product is not particularly limited to these.
[0019]
Hereinafter, the three-dimensional article (formed body) made of paper will be described in more detail based on examples, but the present invention is not limited to the following examples.
[0020]
Embodiment 1
A4 size waste office paper (raw paper) was cut to a width of 4 mm using a commercially available shredder to obtain strips of paper. 100.8 g of this paper piece was placed in a container, and 100.8 g of water was added by spraying with stirring to make the entire strip of paper uniformly wet with water. Then, while stirring, the powdered pregelatinized starch was added. 11.2 g was added, and the pregelatinized starch was adhered in a state of being uniformly dispersed throughout the paper piece.
[0021]
Next, this paper piece is filled in a mold formed by combining a stainless plate (thickness: 3 mm) having a large number of through holes with a diameter of about 3 mm into a box shape, and is pressed at 100 ° C. while being pressed so that the formed body has a predetermined thickness. The mold was housed in a hot air circulating drier together with the mold, and dried by heating.
[0022]
The dried molded article was taken out of the mold, and further dried by heating in a dryer to produce a three-dimensional paper article (molded article) having a length and width of 200 mm, a height of 40 mm, and a bulk density of 0.07 g / cm 3 .
[0023]
Embodiment 2
The used comic magazine paper (raw material paper) is cut into 7 x 150 mm using a cutting machine to obtain a strip-shaped piece of paper. 216 g of this piece of paper is accommodated in a container, and 162 g of water is sprayed with stirring to uniformly wet the entire piece of paper. I let it. Then, while stirring, 12 g of corn starch and 12 g of pregelatinized starch powder were added thereto, and corn starch and pregelatinized starch were uniformly dispersed and adhered to the entire strip of paper.
[0024]
Next, this paper piece is put into a mold formed by combining a stainless plate (thickness: 3 mm) having a large number of through holes with a diameter of about 3 mm in a box shape and pressurized. After heating and drying, the molded product was taken out of the mold and further dried by heating in a dryer to produce a three-dimensional paper product having a length and width of 200 mm, a height of 40 mm, and a bulk density of 0.15 g / cm 3 .
[0025]
Embodiment 3
Using a cutting machine, a piece of office paper (raw paper) is cut into a strip-shaped piece of paper having a width of 20 mm and a length of 200 mm. 144 g of this piece of paper is accommodated in a container, and 100.5 g of water is sprayed under stirring. The entire piece of paper was moistened. Then, 16 g of alpha starch powder was added with stirring, and the pregelatinized starch was uniformly dispersed and adhered to the whole piece of paper.
[0026]
Next, this paper piece is put into a mold formed by combining a stainless plate (thickness: 3 mm) having a large number of through holes with a diameter of about 3 mm in a box shape and pressurized. After heating and drying, the molded product was taken out of the mold and further dried by heating in a dryer to produce a three-dimensional paper product having a length and width of 200 mm, a height of 40 mm, and a bulk density of 0.10 g / cm 3 .
[0027]
Embodiment 4
Using a cutting machine, a cardboard liner base paper (raw paper) was cut into a strip of paper having a width of 7 mm and a length of 150 mm. 216 g of this piece of paper was placed in a container, and 216 g of water was sprayed and added thereto with stirring to make the entire piece of paper moist. Then, 24 g of pregelatinized starch powder was added with stirring, and the pregelatinized starch was uniformly dispersed and adhered to the entire piece of paper.
[0028]
Next, this paper piece is put into a mold formed by combining a stainless plate (thickness: 3 mm) having a large number of through holes with a diameter of about 3 mm in a box shape and pressurized. After heating and drying, the molded product was taken out of the mold and further dried by heating in a dryer to produce a three-dimensional paper product having a length and width of 200 mm, a height of 40 mm, and a bulk density of 0.15 g / cm 3 .
[0029]
Embodiment 5
A strip of paper obtained by cutting a comic magazine waste paper (raw material paper) into a width of 7 mm and a length of 150 mm using a cutting machine was obtained. 288 g of the paper piece was accommodated in a container, and 216 g of water was sprayed and added with stirring. The entire piece of paper was moistened. Then, 32 g of pregelatinized starch powder was added with stirring, and the pregelatinized starch was adhered to the whole piece of paper in a state of being uniformly dispersed.
[0030]
Next, this paper piece is put into a mold formed by combining a stainless plate (thickness: 3 mm) having a large number of through holes with a diameter of about 3 mm in a box shape and pressurized. After heating and drying, the molded body was taken out of the mold and further heated and dried in a dryer to produce a three-dimensional paper product having a length and width of 200 mm, a height of 40 mm, and a bulk density of 0.20 g / cm 3 .
[0031]
The three-dimensional objects made of paper of Examples 1 to 5 above have the original texture and texture of the paper, and various surface conditions are visually observed depending on the type, color, and pattern of the raw material paper, and special decoration and It can be used as an object, display, etc. in a room or in a display case, etc., which gives a soft feeling of paper without packaging. Further, since a buffer design by controlling the density from 0.07 to 0.20 g / cm 2 is also possible, it could be used as a buffer material.
[0032]
【The invention's effect】
As described above, according to the method for producing a three-dimensional article made of paper of the present invention,
(1) The raw material used does not require repulping and is merely cut into strips, so that a pulping apparatus is not required.
(2) In addition, the bulk density of the three-dimensional object made of paper is reduced to a low density of about 0.07 to 0.20 g / cm 3 .
(3) Recovered paper can be used as a raw paper, which can contribute to the expansion of recycled paper applications. In particular, if a natural binder is used, the environmental load after disposal is small.
(4) As compared with the conventional method, the amount of water used is small, and the cost for drainage and the cost for drying can be reduced.
(5) In the three-dimensional article made of paper, since strip-shaped papers are point-bonded to each other with a powdery binder, the original texture, texture and physical properties of the paper are not impaired.
(6) When used paper is used as the raw material paper, it can be formed into various surface conditions depending on the type and printing of the base paper, the size and shape of the strip of paper, etc. It can be used as a cushioning material for transporting goods and as a support and fixing material for goods.
In other words, it has an excellent effect.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing a manufacturing method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Raw material paper 3 Paper piece 5 Powder binder 7 Mold 10 Paper three-dimensional object
