JPH0890521A - Low-density board - Google Patents

Low-density board

Info

Publication number
JPH0890521A
JPH0890521A JP6229615A JP22961594A JPH0890521A JP H0890521 A JPH0890521 A JP H0890521A JP 6229615 A JP6229615 A JP 6229615A JP 22961594 A JP22961594 A JP 22961594A JP H0890521 A JPH0890521 A JP H0890521A
Authority
JP
Japan
Prior art keywords
pulp
paper pulp
waste paper
length
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6229615A
Other languages
Japanese (ja)
Inventor
Hideo Ikezawa
秀男 池沢
Katsushi Sakano
賀津士 坂野
Fumio Niwa
文雄 丹羽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Oji Paper Co Ltd
Original Assignee
New Oji Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Oji Paper Co Ltd filed Critical New Oji Paper Co Ltd
Priority to JP6229615A priority Critical patent/JPH0890521A/en
Publication of JPH0890521A publication Critical patent/JPH0890521A/en
Pending legal-status Critical Current

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  • Processing Of Solid Wastes (AREA)
  • Nonwoven Fabrics (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

PURPOSE: To provide a method for stably and easily manufacturing a low-density board made of wastepaper and having excellent cushioning properties. CONSTITUTION: A low-density board is obtained by the steps of mixing wastepaper pulp fibrillated in dry system with thermoplastic resin fine fiber in dry system, then heating them at a temperature of the melting point or higher of the fine fiber thereby to melt the part of all of the fine fiber, and adhering the pieces of the wastepaper to each other. The wastepaper has necessarily a length weighted average length of 0.5m or more and is preferably that the ratio of the wastepaper pulp in which the fiber length compared in terms of the number is 0.4mm or less is 90% or less of the entire wastepaper pulp and the ratio of the wastepaper pulp of 1mm or more is 30% or more. The fine fiber is preferably made of pulplike multi-branched fiber made of polyolefin resin, and weighted average fiber length is preferably in a range of 0.2-15mm.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、古紙を主素材とした低
密度ボードに関し、さらに詳しくは物品の破損、傷つ
け、つぶれ等を防止する目的で使用される緩衝材や、断
熱、保温材等として広範な使用が可能な低密度のボ−ド
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low density board mainly made of waste paper, and more specifically, a cushioning material, a heat insulating material, a heat insulating material and the like used for the purpose of preventing damage, damage and crushing of articles. The present invention relates to a low-density board that can be widely used as.

【0002】[0002]

【従来の技術】工場、商店、オフィス、一般家庭等から
排出される多量の古紙は、環境保護および資源の有効活
用の観点から、近年その利用分野、利用方法の拡大が急
務となっている。古紙を緩衝材の原料として用いる方法
としては、古紙を水で解繊して作製した古紙パルプを、
型金に導入し乾燥させることにより、卵の破壊防止用パ
ック状緩衝材等を得る、いわゆるモールド法が広く利用
されている。しかしながら、この方法で得られる古紙パ
ルプ緩衝材は、水で解繊した古紙パルプを乾燥させて成
型するため、パルプ間に強固な水素結合が形成され、金
型の形状により、見かけの嵩は高くできる一方で、得ら
れた基材の真比重は高く、しかも硬いため、緩衝性能は
不十分であった。また、基材自体が硬いために、シート
状の緩衝材としては、利用できなかった。更に、用途に
応じて高価な金型を作る必要があるという問題もあっ
た。
2. Description of the Related Art In recent years, a large amount of waste paper discharged from factories, shops, offices, general households, etc. has been urgently required to be expanded in its fields of use and methods from the viewpoint of environmental protection and effective use of resources. As a method of using waste paper as a raw material for the cushioning material, waste paper pulp prepared by disintegrating waste paper with water,
A so-called molding method is widely used in which a pack-shaped cushioning material for preventing the destruction of eggs is obtained by introducing it into a mold and drying it. However, since the used paper pulp cushioning material obtained by this method is formed by drying used paper pulp disintegrated with water, a strong hydrogen bond is formed between the pulps, and the apparent bulk is high due to the shape of the mold. On the other hand, since the obtained base material has a high true specific gravity and is hard, the buffer performance was insufficient. Further, since the base material itself is hard, it cannot be used as a sheet-shaped cushioning material. Further, there is a problem that it is necessary to make an expensive mold according to the application.

【0003】これらの問題を解決する方法としては、例
えば、特開昭56ー41142号公報には、古紙パルプと繊維長
10mm以上の繊維と熱可塑性樹脂粉末を乾式で混合後、
加熱成型したパレットが開示されている。この方法を用
いれば、パルプ間に水素結合がほとんど存在しないため
に、嵩高いシートの製造が可能である。しかしながら、
熱可塑性樹脂粉末をバインダーとして使用しているため
に、加熱成型後のシートが硬くなり、緩衝性能が劣るば
かりでなく、フェノール樹脂等の熱硬化性樹脂粉末を古
紙パルプや繊維と混合するさい、あるいはその後の製造
工程において、該熱硬化性樹脂粉末が飛散し、更に熱処
理時にフェノールやホルマリンが発生する等、作業環境
の悪化という問題があった。
As a method for solving these problems, for example, Japanese Laid-Open Patent Publication No. 56-41142 discloses waste paper pulp and fiber length.
After mixing fibers of 10 mm or more and thermoplastic resin powder by dry method,
A heat molded pallet is disclosed. Using this method, it is possible to produce a bulky sheet because there are almost no hydrogen bonds between the pulps. However,
Since the thermoplastic resin powder is used as a binder, the sheet after heat molding becomes hard, and not only the buffer performance is poor, but also when the thermosetting resin powder such as phenol resin is mixed with waste paper pulp or fiber, Alternatively, in the subsequent manufacturing process, there is a problem that the working environment is deteriorated, for example, the thermosetting resin powder is scattered and further phenol and formalin are generated during the heat treatment.

【0004】一方、特公昭52ー20588号公報には、ダンボ
ール、板紙等の古紙に対して、1 〜50重量%の合成パル
プを加え、これを乾式レファイナー等の解繊機を用いて
乾燥状態で混合解繊後、フォーメーションワイヤー上に
堆積し、次いで熱プレスにより平板状シートを製造する
方法が開示されている。この方法を用いれば、シート形
成の段階で水が存在しないため、水素結合の形成により
シートが硬くなり、シートの密度も上昇する等の問題は
なく、しかも接着剤としてフェノール樹脂等の熱硬化性
樹脂粉末を使用していないため、製造時の熱硬化性樹脂
粉末の飛散や、加熱処理時に発生するフェノールやフォ
ルマリンによる、作業環境の悪化は無い。しかし、古紙
と合成パルプを乾式レファイナーで混合解繊するため
に、レファイナー内部の温度上昇により合成パルプが融
解し、古紙パルプフロックを形成したり、レファイナー
内部に融解した合成パルプが付着する等の問題点があ
り、また使用する古紙パルプの繊維長分布を特定の範囲
にしていないため、多量の粉状微細パルプ繊維成分によ
る作業環境の悪化や、パルプの長繊維成分の不足によ
る、強度や成型性の不足等の問題により、安定して高品
質の低密度ボードを作製することができなかった。更
に、特定の繊維長の合成パルプを使用していないため
に、緩衝材の実用に耐え得る強度と緩衝性を併せ持つ古
紙シートを安定的に製造することは困難であった。
On the other hand, JP-B-52-20588 discloses that 1 to 50% by weight of synthetic pulp is added to used paper such as cardboard and paperboard, and the pulp is dried in a dry state using a defibrating machine such as a dry refiner. After mixing and defibrating, a method of depositing on a formation wire and then producing a flat sheet by hot pressing is disclosed. If this method is used, water does not exist at the stage of forming the sheet, so there is no problem that the sheet becomes hard due to the formation of hydrogen bonds and the density of the sheet increases, and moreover, thermosetting properties such as phenol resin as an adhesive Since no resin powder is used, the working environment is not deteriorated due to the scattering of the thermosetting resin powder during production and the phenol and formalin generated during the heat treatment. However, since waste fiber and synthetic pulp are mixed and defibrated by a dry refiner, the temperature inside the refiner causes the synthetic pulp to melt, forming waste paper pulp flocs, and the molten synthetic pulp adhering to the inside of the refiner. However, because the fiber length distribution of the used paper pulp used is not within a specific range, the work environment is deteriorated due to a large amount of powdered fine pulp fiber components, and the strength and moldability due to the lack of long fiber components in the pulp. Due to a problem such as a shortage, it was not possible to stably produce a high-quality low-density board. Furthermore, since synthetic pulp having a specific fiber length is not used, it is difficult to stably produce a waste paper sheet having both strength and cushioning properties that can be practically used as cushioning materials.

【0005】[0005]

【発明が解決しようとする課題】本発明の目的は、古紙
を主原料とすることにより、使用後に原料として再利用
が可能であり、廃棄する場合でも土中への埋設により微
生物で分解され、焼却処理する場合でも、有毒ガスの発
生が無い、環境に優しい低密度ボードの製造方法を提供
することにある。更に、製造工程で水を使用することに
起因するボードの硬さがなく、製造時におけるバインダ
ーや紙粉の飛散による環境の悪化がほとんど無く、使用
したバインダーからのフェノールやフォルマリン等の有
害物質の発生なしに、古紙を有効に利用して、緩衝性、
断熱性等に優れ、良好な強度と熱成型性を有し、かつ製
造が容易である嵩高な低密度ボードを提供することであ
る。
The object of the present invention is to use recycled paper as the main raw material so that it can be reused as a raw material after use, and even if it is discarded, it will be decomposed by microorganisms by being buried in the soil, An object of the present invention is to provide an environment-friendly method for producing a low-density board that does not generate a toxic gas even when incinerated. Furthermore, there is no hardness of the board due to the use of water in the manufacturing process, there is almost no deterioration of the environment due to the scattering of binder and paper powder during manufacturing, and harmful substances such as phenol and formalin from the binder used. Effective use of waste paper, cushioning,
An object of the present invention is to provide a bulky low-density board which has excellent heat insulation properties, good strength and thermoformability, and is easy to manufacture.

【0006】[0006]

【課題を解決するための手段】本発明者らは、かかる現
状に鑑み、鋭意研究を重ねた結果、古紙を、水を用いず
空気中で解繊する方法(乾式)で解繊した古紙パルプ
と、熱可塑性樹脂の微細繊維とを、乾式で混合した繊維
集合体を、該熱可塑性樹脂の融点以上の温度で加熱する
ことにより、該熱可塑性樹脂微細繊維の一部または全部
を溶解し、古紙パルプ同士を結合させて低密度ボードを
得る方法において、解繊後の長さ加重平均長さ(length
-weighted average length)が0.5mm以上である古紙
パルプを使用することにより、上記の問題の解消が可能
であり、更に、本数で比較した、繊維長が0.4mm以下
の古紙パルプの比率が、全古紙パルプの90%以下あり、
繊維長が1mm以上の古紙パルプの比率が、全古紙パル
プの3 %以上である古紙パルプを使用することにより、
緩衝性、断熱性等に優れた低密度ボードを容易に得るこ
とが可能なことを見出し、本発明を完成した。
Means for Solving the Problems The inventors of the present invention have made extensive studies in view of the present situation, and as a result, used paper pulp defibrated by a method of defibrating used paper in the air without using water (dry method). And a fine fiber of a thermoplastic resin, a fiber assembly obtained by dry-mixing, by heating at a temperature equal to or higher than the melting point of the thermoplastic resin, to dissolve a part or all of the thermoplastic resin fine fiber, In the method of combining waste paper pulp to obtain a low-density board, the length-weighted average length after defibration (length
-By using waste paper pulp with a weighted average length of 0.5 mm or more, the above problems can be solved. Furthermore, the ratio of waste paper pulp with a fiber length of 0.4 mm or less is 90% or less of waste paper pulp,
By using waste paper pulp with a fiber length of 1 mm or more, the ratio of waste paper pulp is 3% or more of the total waste paper pulp,
The present invention has been completed by finding that it is possible to easily obtain a low-density board having excellent buffering properties, heat insulating properties, and the like.

【0007】本発明に使用する古紙は、パルプ繊維を主
体として形成されたものであれば特に限定するものでは
ないが、例えば新聞紙、雑誌、本、ダンボール、板紙、
上質紙、チラシ、パンフレット、包装用紙等の古紙を使
用することができる。解繊処理前の古紙の水分は、2〜1
5%、好ましくは2.5〜12%の範囲であるのが好ましい。
古紙の水分が、2 %より小さいと、シートが硬くなり、
乾式での解繊時に低密度ボードの製造に適さない微細パ
ルプ成分が増加するため好ましくない。更に、低水分の
ために、静電気の帯電が著しく、作業性を低下させるた
め好ましくない。逆に、古紙の水分が15%を越えると乾
式での解繊が不十分になり、紙片やパルプフロックが存
在しやすくなるばかりでなく、低密度ボード製造時の加
熱処理工程で、トラブル発生の原因となるため好ましく
ない。本発明においては、古紙は水を用いず空気中で解
繊される。解繊の方法は通常のドライパルプ製造装置や
乾式レファイナー等が使用可能である。この場合、古紙
はシュレッダー等の断裁装置や破砕装置で、解繊前に事
前に粗砕しても良い。
The used paper used in the present invention is not particularly limited as long as it is formed mainly of pulp fibers, and for example, newspaper, magazine, book, cardboard, paperboard,
Used paper such as high-quality paper, leaflets, pamphlets, and packaging paper can be used. The water content of waste paper before defibration is 2-1
It is preferably in the range of 5%, preferably 2.5-12%.
If the water content of waste paper is less than 2%, the sheet will become stiff,
It is not preferable because the fine pulp component unsuitable for the production of the low density board increases during the defibration in the dry method. Furthermore, the low water content is not preferable because static electricity is significantly charged and workability is deteriorated. Conversely, if the water content of waste paper exceeds 15%, dry defibration will be insufficient, and not only paper pieces and pulp flocs will tend to be present, but trouble will also occur during the heat treatment process during the production of low-density boards. It is not preferable because it causes the problem. In the present invention, waste paper is defibrated in air without using water. As a defibration method, a normal dry pulp manufacturing apparatus, a dry refiner, or the like can be used. In this case, the used paper may be roughly crushed in advance before defibration with a cutting device such as a shredder or a crushing device.

【0008】本発明の特徴の第一は、乾式で解繊したパ
ルプ繊維の長さ加重平均長さ(length-weighted averag
e length)が特定の数値以上である古紙パルプと、熱可
塑性樹脂の微細繊維とを、乾式で混合した繊維集合体
を、該熱可塑性樹脂の融点以上の温度で加熱し、該熱可
塑性樹脂微細繊維の一部または全部を溶解し、古紙パル
プ同士を結合させることである。
The first feature of the present invention is that the length-weighted averag of dry defibrated pulp fibers is
(e length) used paper pulp having a specific numerical value or more, and fine fibers of a thermoplastic resin are dry-mixed, and a fiber assembly is heated at a temperature equal to or higher than the melting point of the thermoplastic resin. The purpose is to dissolve some or all of the fibers and bond the waste paper pulps together.

【0009】本発明の特徴の第二は、本数で比較した繊
維長分布を、特定の範囲内に制御した古紙パルプを使用
することにある。即ち、乾式で解繊後の、長さ加重平均
長さが0.5mm以上、好ましくは0.6mm以上の古紙パル
プと、熱可塑性樹脂の微細繊維とを、乾式で混合した繊
維集合体を、該熱可塑性樹脂の融点以上の温度で加熱
し、該熱可塑性樹脂微細繊維の一部または全部を溶解
し、古紙パルプ同士を結合させることを特徴とし、更
に、本数で比較した、繊維長が0.4mm以下の古紙パル
プの比率が、全古紙パルプの90%以下、好ましくは85%
以下であり、1mm以上の古紙パルプの比率が、全古紙
パルプの3%、好ましくは4%、最も好ましくは5 %以上
である古紙パルプを使用することことを特徴とする。
The second feature of the present invention is to use waste paper pulp whose fiber length distribution compared by the number of fibers is controlled within a specific range. That is, a length-weighted average length after defibration in a dry method is 0.5 mm or more, preferably 0.6 mm or more of waste paper pulp, and a fine fiber of a thermoplastic resin are mixed in a dry method to obtain a fiber assembly. It is characterized by heating at a temperature above the melting point of the plastic resin, melting some or all of the thermoplastic resin fine fibers, and binding waste paper pulp to each other.Furthermore, comparing the numbers, the fiber length is 0.4 mm or less. 90% or less of the total used paper pulp, preferably 85%
It is characterized in that used paper pulp having a ratio of used paper pulp of 1 mm or more is 3%, preferably 4%, most preferably 5% or more of the total used paper pulp.

【0010】長さ加重平均長さが0.5mmより短いと、
作製した低密度ボードの表面強度が低下し、表面摩擦に
より、パルプ粉の脱離が発生し易く、更に曲げ加工等を
行う場合に、基材のひび割れ等が生じ易く適当でない。
また、本数で比較した、繊維長が0.4mm以下の古紙パ
ルプの比率が、全古紙パルプの90%より大きい場合、作
製した低密度ボードの表面強度が低下し、表面摩擦によ
り、パルプ粉の脱離が発生し易く、更に曲げ加工等を行
う場合に、基材のひび割れ等が生じ易く好ましくない。
逆に、本数で比較した、繊維長が1mm以下の古紙パル
プの比率が、全古紙パルプの3%を下回ると、シート強
度が低下し、更に曲げ加工等を行う場合に、基材のひび
割れ等が生じ易く適当でない。
If the length-weighted average length is shorter than 0.5 mm,
The surface strength of the produced low-density board is reduced, the pulp powder is liable to be detached due to surface friction, and cracks and the like of the base material are likely to occur when performing bending or the like, which is not suitable.
Also, when the ratio of waste paper pulp with a fiber length of 0.4 mm or less compared with the number of waste fibers is more than 90% of the total waste paper pulp, the surface strength of the prepared low density board decreases and the surface friction causes the pulp powder to be removed. Separation is likely to occur, and cracking of the substrate is likely to occur when bending is further performed, which is not preferable.
Conversely, if the ratio of waste paper pulp with a fiber length of 1 mm or less is less than 3% of the total waste paper pulp compared with the number of sheets, the sheet strength will decrease, and cracking of the base material etc. Is likely to occur and is not suitable.

【0011】パルプの長さ加重平均繊維長とは、パルプ
中の各繊維の長さをLi (i=1、2、3...n 、nは繊維の
本数)とし、Li の自乗の総和をLi の総和で除した数
値である。古紙パルプの長さ加重平均繊維長は、古紙パ
ルプ中から、面積1mm2以上の未離解の紙片を除去後、
バルメット・オートメーション社のカヤニー繊維長測定
機FS-2000 を用いて測定することが可能である。
The length-weighted average fiber length of the pulp is the sum of the squares of Li, where Li is the length of each fiber in the pulp (i = 1, 2, 3 ... n, n is the number of fibers). Is the value obtained by dividing the sum of Li. The length-weighted average fiber length of waste paper pulp is calculated by removing unbroken paper pieces with an area of 1 mm 2 or more from waste paper pulp.
It is possible to measure using KAYANI fiber length measuring machine FS-2000 manufactured by Valmet Automation.

【0012】本発明に使用可能な熱可塑性樹脂の微細繊
維は、ポリエチレンやポリプロピレン等のポリオレフィ
ン系樹脂、ナイロン等のポリアミド系樹脂、ポリエステ
ル系樹脂等の熱可塑性樹脂、あるいはこれらの樹脂の共
重合物を短繊維状に加工したもの、または上記樹脂の2
種以上を同時に紡糸した、いわゆるサイドバイサイドタ
イプや、シースコアタイプの複合繊維を短繊維状に加工
したものであり、これらの1種以上を使用することが可
能である。特に、ポリエチレンやポリプロピレン等のポ
リオレフィン樹脂より製造された、パルプ状多分岐繊維
が好ましい。熱可塑性樹脂の微細繊維の重量平均繊維長
は、0.2 〜15mmの範囲、好ましくは0.3 〜5mmの範
囲である。繊維長が0.2mmより小さいと、作製した低
密度ボードの強度が低下するため好ましくない。逆に繊
維長が15mmを越えると、パルプ中の熱可塑性樹脂微細
繊維の分散が不均一になり、好ましくない。熱可塑性樹
脂の微細繊維の重量平均繊維長は、JIS P8207 に示され
た装置を用い、TAPPI T233に示された方法で測定するこ
とが可能である。
The fine fibers of the thermoplastic resin that can be used in the present invention include polyolefin resins such as polyethylene and polypropylene, polyamide resins such as nylon, thermoplastic resins such as polyester resins, and copolymers of these resins. Processed into short fiber, or 2 of the above resins
This is a so-called side-by-side type or sheath core type conjugate fiber obtained by spinning at least one kind of fiber at the same time, and it is possible to use one or more kinds of these. Particularly, pulp-like multi-branched fibers manufactured from polyolefin resins such as polyethylene and polypropylene are preferable. The weight average fiber length of the fine fibers of the thermoplastic resin is in the range of 0.2 to 15 mm, preferably 0.3 to 5 mm. If the fiber length is less than 0.2 mm, the strength of the produced low-density board decreases, which is not preferable. On the other hand, if the fiber length exceeds 15 mm, the thermoplastic resin fine fibers are not evenly dispersed in the pulp, which is not preferable. The weight average fiber length of fine fibers of the thermoplastic resin can be measured by the method shown in TAPPI T233 using the apparatus shown in JIS P8207.

【0013】古紙パルプと熱可塑性微細繊維との絶乾重
量配合比率は、古紙パルプ/微細繊維=95〜60/5
〜40、好ましくは90〜70/10〜30の範囲とす
る。熱可塑性繊維の配合率が5%未満では作成した低密
度ボ−ドの強度が弱く、配合率が40%を超えるとボ−
ドが硬くなりすぎて好ましくない。
The absolutely dry weight mixing ratio of waste paper pulp and thermoplastic fine fiber is as follows: waste paper pulp / fine fiber = 95-60 / 5
-40, preferably 90-70 / 10-30. If the blending ratio of the thermoplastic fiber is less than 5%, the strength of the low density board prepared is weak, and if the blending ratio exceeds 40%, the board is void.
It is not preferable because it becomes too hard.

【0014】本発明においては、製品である低密度ボ−
ドの強度と成型性を向上させるために、古紙パルプ中に
繊維の長い針葉樹パルプを配合することが可能である。
使用する針葉樹パルプは特に限定するものではないが、
例えば針葉樹をクラフト法、ソ−ダ法、ポリサルファイ
ド法などで煮解した化学パルプ、またはグランドパル
プ、サ−モメカニカルパルプ等の機械パルプを、未漂白
のままあるいは漂白して、単独または混合して使用する
ことが出来る。
In the present invention, a low density product which is a product is
In order to improve the strength and moldability of the pulp, it is possible to mix softwood pulp with long fibers in the waste paper pulp.
The softwood pulp used is not particularly limited,
For example, chemical pulp obtained by boiling softwood by Kraft method, soda method, polysulfide method or the like, or mechanical pulp such as ground pulp, thermomechanical pulp, unbleached or bleached, alone or mixed. Can be used.

【0015】針葉樹パルプは、長さ加重平均繊維長が0.
7mm以上、好ましくは1mm以上であり、本数で比較
した繊維長が0.6mm以下の針葉樹パルプの比率が、全
針葉樹パルプのの80%以下、好ましくは75%以下で
あり、繊維長が1.5mm以上の針葉樹パルプの比率が全
針葉樹パルプの5%以上、好ましくは10%以上のもの
を使用する必要がある。この範囲から外れた長繊維部分
の少ない針葉樹パルプを使用すると、強度の向上は少な
い。また古紙パルプに対する針葉樹パルプの配合率は、
5%以上とし好ましくは10%以上とする。配合率が5
%未満では強度の向上が十分でない。針葉樹パルプは古
紙パルプと同様に、水分が2〜15%の状態のものを乾
式で解繊し、古紙パルプと乾式状態で混合する。
Softwood pulp has a length weighted average fiber length of 0.
7 mm or more, preferably 1 mm or more, and the ratio of the softwood pulp having a fiber length of 0.6 mm or less compared by the number is 80% or less, preferably 75% or less of the total softwood pulp, and the fiber length is 1.5 mm or more. It is necessary to use a softwood pulp having a ratio of 5% or more, preferably 10% or more, of the total softwood pulp. When a softwood pulp having a long fiber portion out of this range is used, the strength is not improved so much. The blending ratio of softwood pulp to waste paper pulp is
It is made 5% or more and preferably 10% or more. Mixing ratio is 5
If it is less than%, the strength is not sufficiently improved. Like the waste paper pulp, the softwood pulp is defibrated by a dry method with a water content of 2 to 15% and mixed with the waste paper pulp in a dry state.

【0016】均一に混合された古紙パルプと熱可塑性微
細繊維との繊維集合体は、移動するベルト状搬送用支持
体上に積層され、加熱処理装置へ移送される。この場
合、古紙パルプと熱可塑性微細繊維との混合繊維積層体
を上下から通気性の搬送用支持体で挟んでもよいし、熱
伝導性の高い、金属ベルト等ではさんで搬送しても良
い。加熱装置としては、混合繊維積層体中の熱可塑性微
細繊維の溶融が可能であれば、特に限定するものではな
く、例えば、熱風炉やマイクロウエーブ等が使用でき
る。熱風炉の場合には、古紙パルプや熱性微細繊維の飛
散を防止するために、搬送用支持体の下から吸引してお
くことが好ましい。加熱装置の加熱温度は、260℃以下
であることが好ましい。加熱温度が260℃を越えると、
パルプ繊維の炭化や発火の恐れがあり、好ましくない。
A fiber assembly of waste paper pulp and thermoplastic fine fibers, which are uniformly mixed, is laminated on a moving belt-shaped carrier for conveyance and transferred to a heat treatment apparatus. In this case, the mixed fiber laminate of waste paper pulp and thermoplastic fine fibers may be sandwiched from above and below by a breathable carrier support, or may be carried by being sandwiched by a metal belt or the like having high thermal conductivity. The heating device is not particularly limited as long as it can melt the thermoplastic fine fibers in the mixed fiber laminate, and for example, a hot air oven or a microwave can be used. In the case of a hot-blast stove, it is preferable to suck the waste paper pulp or the heat-resistant fine fibers from below the transport support in order to prevent the waste paper pulp and the thermal fine fibers from scattering. The heating temperature of the heating device is preferably 260 ° C. or lower. If the heating temperature exceeds 260 ° C,
There is a risk of carbonization and ignition of pulp fibers, which is not preferable.

【0017】加熱装置により熱可塑性樹脂微細繊維の融
点以上に加熱された古紙パルプおよび熱可塑性樹脂微細
繊維の混合繊維積層体は、加熱装置内あるいは加熱装置
を出た後で、プレスロール等の加圧装置によって加圧さ
れ、所望の厚さおよび密度の低密度ボードを得ることが
できる。この場合、加圧処理は加熱装置の中および加熱
装置を出た後の両方で行ってもよい。加熱および加圧成
型後の低密度ボードの密度は、0.01〜0.4g/cm3、好
ましくは0.05〜0.3g/cm3の範囲であることが好まし
い。作製した低密度ボードの密度が0.01g/cm3より
小さいと、ボードの強度が低下するため好ましくなく、
逆に、ボードの密度が0.4g/cm3より大きいと、作製し
たボードが硬くなり過ぎ、緩衝性能が低下するため好ま
しくない。
The mixed fiber laminate of waste paper pulp and thermoplastic resin fine fibers heated to a temperature not lower than the melting point of the thermoplastic resin fine fibers by the heating device is added to a press roll or the like in the heating device or after leaving the heating device. It can be pressed by a pressure device to obtain a low density board of desired thickness and density. In this case, the pressure treatment may be performed both inside the heating device and after exiting the heating device. The density of the low-density board after heating and pressure molding is preferably in the range of 0.01 to 0.4 g / cm 3 , preferably 0.05 to 0.3 g / cm 3 . If the density of the manufactured low-density board is less than 0.01 g / cm 3 , the strength of the board is reduced, which is not preferable.
On the contrary, if the density of the board is larger than 0.4 g / cm 3 , the manufactured board becomes too hard and the buffering performance is lowered, which is not preferable.

【0018】一方、古紙パルプと熱可塑性微細繊維の混
合繊維を加熱機能を有するプレス機で熱プレスすること
によっても、上記方法と同様に低密度ボードを得ること
が可能である。即ち、均一に混合された古紙パルプと熱
可塑性微細繊維の混合繊維を、所望の低密度ボードの厚
さと同じ厚さのスペーサーを置いた、熱プレスの試料保
持側(下側)のプレス板の上に積層し、該熱性微細繊維
の融点以上の温度で熱プレスすることによって、上記方
法と同様に低密度ボードを作製することができるのであ
る。熱プレス開放後に低密度ボ−ドの厚さの戻りがある
場合には、スペ−サ−の厚さを薄くすることで所望の低
密度ボ−ドの厚さを得ることがあ出来る。熱プレスの加
熱温度は、260℃以下であることが好ましい。加熱温度
が260℃を越えると、パルプ繊維の炭化や発火の恐れが
あり、好ましくない。プレス成型時の圧力は、混合繊維
の積層体をスペーサーの厚みまで圧縮できる圧力であれ
ば良く、特に限定するものではない。即ち、圧力を高く
しても、スペーサーが存在することにより、スペーサー
の厚み以下に混合繊維の積層体が潰されることは無い。
On the other hand, a low-density board can be obtained by hot pressing mixed fibers of waste paper pulp and thermoplastic fine fibers with a press having a heating function, as in the above method. That is, the mixed fibers of waste paper pulp and thermoplastic fine fibers that are uniformly mixed are placed on a press plate on the sample holding side (lower side) of the hot press, in which a spacer having the same thickness as the desired low-density board is placed. A low-density board can be produced in the same manner as in the above method by stacking layers on top of each other and heat-pressing at a temperature equal to or higher than the melting point of the thermal fine fibers. When there is a return of the thickness of the low density board after the hot press is released, the thickness of the spacer can be reduced to obtain the desired thickness of the low density board. The heating temperature of the hot press is preferably 260 ° C or lower. If the heating temperature exceeds 260 ° C, the pulp fibers may be carbonized or ignited, which is not preferable. The pressure at the time of press molding is not particularly limited as long as it can compress the laminated body of mixed fibers to the thickness of the spacer. That is, even if the pressure is increased, the presence of the spacer does not cause the laminated body of the mixed fibers to be crushed below the thickness of the spacer.

【0019】本発明による低密度ボードは、古紙をその
主原料とするため、廃棄物の有効利用が可能となり、使
用後のボードは再度解繊されて低密度ボードの原料とし
て使用可能である。更に、廃棄する場合でも土中への埋
設により、微生物による分解が可能であり、焼却処理す
る場合でも、有毒ガスの発生が無い、環境に極めて優し
い資材である。本発明により、このような利点を有する
低密度ボードを、製造工程でのバインダーの飛散による
作業環境の悪化がほとんど無く、製造中にフェノールや
フォルマリン等の有害物質の発生無しに、安定かつ容易
に得ることが可能となり、熱成型、打ち抜き、貼合せ
等、必要に応じて種々加工されて、緩衝材、断熱、保温
材等として使用することができる。
Since the low-density board according to the present invention uses waste paper as its main raw material, waste can be effectively used, and the board after use can be defibrated again and used as a raw material for the low-density board. Furthermore, even when it is discarded, it can be decomposed by microorganisms by burying it in the soil, and even when it is incinerated, it is a very environmentally friendly material that does not generate toxic gas. According to the present invention, a low-density board having such advantages can be stably and easily manufactured without causing deterioration of the work environment due to the scattering of the binder in the manufacturing process and without the generation of harmful substances such as phenol and formalin during the manufacturing. Can be obtained, and various processes such as thermoforming, punching, and laminating can be performed as necessary, and the product can be used as a cushioning material, a heat insulating material, a heat insulating material and the like.

【0020】[0020]

【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、本発明は勿論これらに限定されるものでは
ない。尚、以下の実施例において、部および%は、特に
指定が無い場合には、全て重量部および重量%である。 実施例1 水分6 %の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160 )を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは1.44mmであり、本数で比較した、繊維長が0.4
mm以下の古紙パルプの比率は、全古紙パルプの52.5%
であり、1mm 以上の古紙パルプの比率は、全古紙パル
プの20.1%であった。得られた古紙パルプと、乾式で解
繊され乾燥された多分岐状合成パルプ(三井石油化学
(株)製、商品名SWP 、E990)を、古紙パルプ/合成パ
ルプ=80/20の割合で配合し、ミキサーで均一に混合し
て混合繊維を得た。合成パルプの融点は130 ℃であり、
平均繊維長は2.1mmであり、水分は5%であった。次
に、該混合繊維を10mmの高さのスペーサを置いた熱プ
レス装置((株)東洋精機製作所製、ラボプレス30T)
の間に積層し、20kg/cm2の圧力、170℃の温度で10
分間保持し、低密度ボードを得た。得られた低密度ボー
ドの密度は0.15g/cm3であり、坪量は1500g/m2
あった。
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the following examples, all parts and% are parts by weight and% by weight, unless otherwise specified. Example 1 A newspaper crusher with a water content of 6% was used as a pulp crusher (Zuiko Tekko Co., Ltd.).
Co., Ltd., TYPE FR-160), and then pulverized by a dry method using a pulp crusher (Type P-270, manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 1.44 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp of mm or less is 52.5% of all used paper pulp.
The ratio of waste paper pulp of 1 mm or more was 20.1% of the total waste paper pulp. The obtained waste paper pulp and dry defibrated and dried multi-branched synthetic pulp (trade name SWP, E990, manufactured by Mitsui Petrochemical Co., Ltd.) are blended at a ratio of waste paper pulp / synthetic pulp = 80/20. Then, the mixture was uniformly mixed with a mixer to obtain a mixed fiber. The melting point of synthetic pulp is 130 ° C,
The average fiber length was 2.1 mm and the water content was 5%. Next, a heat press device (manufactured by Toyo Seiki Seisakusho Co., Ltd., Lab Press 30T) in which a spacer having a height of 10 mm is placed on the mixed fiber.
10 kg at a pressure of 20 kg / cm 2 and a temperature of 170 ° C.
Hold for a minute to obtain a low density board. The density of the obtained low-density board was 0.15 g / cm 3 and the basis weight was 1500 g / m 2 .

【0021】実施例2 水分8%の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160 )を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは0.80mmであり、本数で比較した、繊維長が0.4
mm 以下の古紙パルプの比率は、全古紙パルプの84%
であり、1mm以上の古紙パルプの比率は、全古紙パル
プの4.0 %であった。得られた古紙パルプと、乾式で解
繊され乾燥された合成パルプ(三井石油化学(株)製、
商品名SWP 、E780)を、古紙パルプ/合成パルプ=85/
15の割合で配合し、ミキサーで均一に混合して混合繊維
を得た。合成パルプの融点は130℃であり、平均繊維長
は1.6mmであり、水分は5%であった。次に、該混合繊
維を20mmの高さのスペーサを置いた熱プレス装置
((株)東洋精機製作所製、ラボプレス30T )の間に積
層し、10kg/cm2の圧力、170℃の温度で10分間保持し、
低密度ボードを得た。得られた低密度ボードの密度は0.
10g/cm3であり、坪量は2000g/m2であった。
Example 2 Waste newspaper with a water content of 8% was crushed by a pulp crusher (Zuiko Tekko Co., Ltd.).
Co., Ltd., TYPE FR-160), and then pulverized by a dry method using a pulp crusher (Type P-270, manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 0.80 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp of mm or less is 84% of the total used paper pulp.
The ratio of waste paper pulp of 1 mm or more was 4.0% of all waste paper pulp. The obtained waste paper pulp and synthetic pulp defibrated and dried by a dry method (manufactured by Mitsui Petrochemical Co., Ltd.,
Product name SWP, E780), recycled paper pulp / synthetic pulp = 85 /
It was mixed in a ratio of 15 and uniformly mixed with a mixer to obtain a mixed fiber. The melting point of the synthetic pulp was 130 ° C., the average fiber length was 1.6 mm, and the water content was 5%. Next, the mixed fibers are laminated between a heat press device (Labo Press 30T, manufactured by Toyo Seiki Seisakusho Co., Ltd.) with a spacer having a height of 20 mm, and the pressure is 10 kg / cm 2 and the temperature is 170 ° C. for 10 minutes. Hold and
A low density board was obtained. The density of the obtained low density board is 0.
It was 10 g / cm 3 and the basis weight was 2000 g / m 2 .

【0022】実施例3 水分5 %の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160 )を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは1.80mmであり、本数で比較した、繊維長が0.4
mm以下の古紙パルプの比率は、全古紙パルプの43.6%
であり、1mm以上の古紙パルプの比率は、全古紙パル
プの28.1%以上であった。得られた古紙パルプと、乾式
で解繊され乾燥された合成パルプ(三井石油化学(株)
製、商品名SWP 、E780)を、古紙パルプ/合成パルプ=
90/10の割合で配合し、ミキサーで均一に混合して混合
繊維を得た。合成パルプの融点は130 ℃であり、平均繊
維長は1.6mmであり、水分は5%であった。次に、該混
合繊維を10mの高さのスペーサを置いた熱プレス装置
((株)東洋精機製作所製、ラボプレス30T)の間に積
層し、20kg/cm2の圧力、170℃の温度で10分間保持
し、低密度ボードを得た。得られた低密度ボードの密度
は0.25g/cm3であり、坪量は2500g/m2であった。
Example 3 Waste newspaper with a water content of 5% was crushed by a pulp crusher (Zuiko Tekko Co., Ltd.).
Co., Ltd., TYPE FR-160), and then pulverized by a dry method using a pulp crusher (Type P-270, manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 1.80 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp of mm or less is 43.6% of the total used paper pulp.
The ratio of waste paper pulp of 1 mm or more was 28.1% or more of the total waste paper pulp. The obtained waste paper pulp and synthetic pulp defibrated and dried by the dry method (Mitsui Petrochemical Co., Ltd.)
Manufactured, trade name SWP, E780), recycled paper pulp / synthetic pulp =
They were mixed in a ratio of 90/10 and uniformly mixed with a mixer to obtain mixed fibers. The melting point of the synthetic pulp was 130 ° C, the average fiber length was 1.6 mm, and the water content was 5%. Next, the mixed fiber was laminated between a heat press device (manufactured by Toyo Seiki Seisakusho Co., Ltd., Lab Press 30T) on which a spacer having a height of 10 m was placed, and the pressure was 20 kg / cm 2 at a temperature of 170 ° C. Hold for a minute to obtain a low density board. The density of the obtained low-density board was 0.25 g / cm 3 , and the basis weight was 2500 g / m 2 .

【0023】実施例4 水分6%の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160 )を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは1.44mmであり、本数で比較した、繊維長が0.4
mm以下の古紙パルプの比率は、全古紙パルプの52.5%
であり、1mm以上の古紙パルプの比率は、紙パルプの2
0.1%であった。得られた古紙パルプと、乾式で解繊さ
れ乾燥された合成パルプ(三井石油化学(株)製、商品
名SWP 、E380)を、古紙パルプ/合成パルプ=80/20の
割合で配合し、ミキサーで均一に混合して混合繊維を得
た。合成パルプの融点は130℃であり、平均繊維長は0.7
mmであり、水分は5 %であった。次に、該混合繊維を
30mmの高さのスペーサ−を置いた熱プレス装置((株)
東洋精機製作所製、ラボプレス30T)の間に積層し、10
kg/cm2の圧力、170 ℃の温度で15分間保持し、低
密度ボードを得た。得られた低密度ボードの密度は0.15
g/cm3であり、坪量は4500g/m2であった。
Example 4 Waste newspaper with a water content of 6% was crushed by a pulp crusher (Zuiko Tekko Co., Ltd.).
Co., Ltd., TYPE FR-160), and then pulverized by a dry method using a pulp crusher (Type P-270, manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 1.44 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp of mm or less is 52.5% of all used paper pulp.
The ratio of waste paper pulp of 1 mm or more is 2 of that of paper pulp.
It was 0.1%. Mix the obtained waste paper pulp with the dry defibrated and dried synthetic pulp (manufactured by Mitsui Petrochemical Co., Ltd., trade name SWP, E380) in the ratio of waste paper pulp / synthetic pulp = 80/20, and mix. To obtain a mixed fiber. The melting point of synthetic pulp is 130 ° C and the average fiber length is 0.7.
mm and water content was 5%. Next, the mixed fiber
Heat press machine with spacer of 30mm height (Co., Ltd.)
Toyo Seiki Seisakusho, Lab Press 30T)
A pressure of kg / cm 2 and a temperature of 170 ° C. were maintained for 15 minutes to obtain a low density board. The density of the obtained low density board is 0.15
It was g / cm 3 and the basis weight was 4500 g / m 2 .

【0024】実施例5 水分6 %の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160 )を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは1.44mmであり、本数で比較した、繊維長が0.4
mm以下の古紙パルプの比率は、全古紙パルプの52.5%
であり、1mm以上の古紙パルプの比率は、全古紙パル
プの20.1%であった。得られた古紙パルプと、乾式で解
繊され乾燥された合成パルプ(三井石油化学(株)製、
商品名SWP 、E990)を、古紙パルプ/合成パルプ=80/
20の割合で配合し、ミキサーで均一に混合して混合繊維
を得た。合成パルプの融点は130 ℃であり、平均繊維長
は2.1mmであり、水分は5%であった。次に、該混合繊
維を30mmの高さのスペーサを置いた熱プレス装置
((株)東洋精機製作所製、ラボプレス30T)の間に積
層し、10kg/cm2の圧力、170℃の温度で15分間保持
し、低密度ボードを得た。得られた低密度ボードの密度
は0.07g/cm3であり、坪量は2400g/m2であった。
Example 5 Waste newspaper with a water content of 6% was crushed by a pulp crusher (Zuiko Tekko Co., Ltd.).
Co., Ltd., TYPE FR-160), and then pulverized by a dry method using a pulp crusher (Type P-270, manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 1.44 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp of mm or less is 52.5% of all used paper pulp.
The ratio of waste paper pulp of 1 mm or more was 20.1% of all waste paper pulp. The obtained waste paper pulp and synthetic pulp defibrated and dried by a dry method (manufactured by Mitsui Petrochemical Co., Ltd.,
Product name SWP, E990), recycled paper pulp / synthetic pulp = 80 /
It was mixed in a ratio of 20 and uniformly mixed with a mixer to obtain a mixed fiber. The melting point of the synthetic pulp was 130 ° C, the average fiber length was 2.1 mm, and the water content was 5%. Next, the mixed fiber was laminated between a heat press device (manufactured by Toyo Seiki Seisakusho Co., Ltd., Labo Press 30T) having a spacer with a height of 30 mm, and a pressure of 10 kg / cm 2 and a temperature of 170 ° C. were applied for 15 minutes. Hold for a minute to obtain a low density board. The obtained low-density board had a density of 0.07 g / cm 3 and a basis weight of 2400 g / m 2 .

【0025】実施例6 水分4%の上質古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160)を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは2.24mmであり、本数で比較した、繊維長が0.4
mm 以下の古紙パルプの比率は、全古紙パルプの38.8
%であり、1mm以上の古紙パルプの比率は、全古紙パ
ルプの32.4%であった。得られた古紙パルプと、乾式で
解繊され乾燥された合成パルプ(三井石油化学(株)
製、商品名SWP 、E990)を、古紙パルプ/合成パルプ=
80/20の割合で配合し、ミキサーで均一に混合して混合
繊維を得た。合成パルプの融点は130 ℃であり、平均繊
維長は2.1mmであり、水分は5%であった。次に、該混
合繊維を10mmの高さのスペーサを置いた熱プレス装置
((株)東洋精機製作所製、ラボプレス30T)の間に積
層し、20kg/cm2の圧力、170℃の温度で10分間保持
し、低密度ボードを得た。得られた低密度ボードの密度
は0.15g/cm3であり、坪量は1500g/m2であった。
Example 6 A high-quality waste paper having a water content of 4% was crushed with a pulp crusher (Zuiko Tekko Co., Ltd.).
Manufactured by TYPE FR-160), and then crushed by a dry method using a pulp crusher (Type P-270 manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 2.24 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp of mm or less is 38.8% of all used paper pulp.
%, And the ratio of waste paper pulp of 1 mm or more was 32.4% of all waste paper pulp. The obtained waste paper pulp and synthetic pulp defibrated and dried by the dry method (Mitsui Petrochemical Co., Ltd.)
Manufactured, trade name SWP, E990), recycled paper pulp / synthetic pulp =
It was blended in a ratio of 80/20 and uniformly mixed with a mixer to obtain a mixed fiber. The melting point of the synthetic pulp was 130 ° C, the average fiber length was 2.1 mm, and the water content was 5%. Next, the mixed fibers were laminated between a heat press device (Labo Press 30T, manufactured by Toyo Seiki Seisakusho, Ltd.) with a spacer having a height of 10 mm, and pressure was 20 kg / cm 2 at a temperature of 170 ° C. for 10 minutes. Hold for a minute to obtain a low density board. The density of the obtained low-density board was 0.15 g / cm 3 and the basis weight was 1500 g / m 2 .

【0026】実施例7 水分6%の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160)を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは1.44mmであり、本数で比較した、繊維長が0.4
mm 以下の古紙パルプの比率は、全古紙パルプの52.5
%であり、1mm 以上の古紙パルプの比率は、全古紙パ
ルプの20.1%であった。得られた古紙パルプと、乾式で
解繊され乾燥された合成パルプ(三井石油化学(株)
製、商品名SWP 、E990)を、古紙パルプ/合成パルプ=
80/20の割合で配合し、ミキサーで均一に混合して混合
繊維を得た。合成パルプの融点は130℃であり、平均繊
維長は2.1mmであり、水分は5%であった。次に、該混
合繊維を、下部から吸引された多孔質材料よりなる搬送
用ベルト上に積層し、熱風ドライヤー中へ導入した。ド
ライヤーの温度は180℃であった。次いで、ドライヤー
出口に設置したプレスロールで、加熱処理した混合繊維
積層体を、密度0.15g/cm3になるように成型し、厚
さ10mm、坪量は1500g/m2の低密度ボードを得た。
Example 7 Waste newspaper with a water content of 6% was crushed with a pulp crusher (Zuiko Tekko Co., Ltd.).
Manufactured by TYPE FR-160), and then crushed by a dry method using a pulp crusher (Type P-270 manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 1.44 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp below mm is 52.5% of all used paper pulp.
%, And the ratio of waste paper pulp of 1 mm or more was 20.1% of all waste paper pulp. The obtained waste paper pulp and synthetic pulp defibrated and dried by the dry method (Mitsui Petrochemical Co., Ltd.)
Manufactured, trade name SWP, E990), recycled paper pulp / synthetic pulp =
It was blended in a ratio of 80/20 and uniformly mixed with a mixer to obtain a mixed fiber. The melting point of the synthetic pulp was 130 ° C, the average fiber length was 2.1 mm, and the water content was 5%. Next, the mixed fiber was laminated on a conveyor belt made of a porous material sucked from below and introduced into a hot air dryer. The dryer temperature was 180 ° C. Then, the heat-treated mixed fiber laminate was molded with a press roll installed at the exit of the dryer to a density of 0.15 g / cm 3, and a low-density board with a thickness of 10 mm and a basis weight of 1500 g / m 2 was obtained. It was

【0027】実施例8 水分6%の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160)を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊し、
古紙パルプを得た。得られた古紙パルプの長さ加重平均
長さは1.44mmであり、本数で比較した、繊維長が0.4
mm 以下の古紙パルプの比率は、全古紙パルプの52.5
%であり、1mm 以上の古紙パルプの比率は、全古紙パ
ルプの20.1%であった。得られた古紙パルプと、乾式で
解繊され乾燥された合成パルプ(三井石油化学8株9
製、商品名SWP 、E990)とを、古紙パルプ/合成パルプ
=80/20の割合で配合し、ミキサーで均一に混合して混
合繊維を得た。合成パルプの融点は130℃であり、平均
繊維長は2.1mmであり、水分は5%であった。次に、該
混合繊維を市販の電子レンジ中に導入し、2450MHzのマイク
ロ波を60秒間照射後、電子レンジから取り出し、プレス
ロールで密度0.15g/cm3になるように加圧成型し
て、厚さ10mm、坪量は1500g/cm2の低密度ボード
を得た。
Example 8 Waste newspaper with a water content of 6% was used for a pulp crusher (Zuiko Tekko Co., Ltd.).
Manufactured by TYPE FR-160), and then crushed by a dry method using a pulp crusher (Type P-270 manufactured by Mizuko Tekko KK).
Waste paper pulp was obtained. The length-weighted average length of the obtained waste paper pulp was 1.44 mm, and the fiber length was 0.4 when compared by the number.
The ratio of used paper pulp below mm is 52.5% of all used paper pulp.
%, And the ratio of waste paper pulp of 1 mm or more was 20.1% of all waste paper pulp. The obtained waste paper pulp and the synthetic pulp that was defibrated and dried by the dry method (Mitsui Petrochemical 8 Co., Ltd. 9
Manufactured by SWP, E990) and blended at a ratio of waste paper pulp / synthetic pulp = 80/20 and uniformly mixed with a mixer to obtain a mixed fiber. The melting point of the synthetic pulp was 130 ° C, the average fiber length was 2.1 mm, and the water content was 5%. Next, the mixed fiber was introduced into a commercially available microwave oven, irradiated with a microwave of 2450 MHz for 60 seconds, taken out from the microwave oven, and pressure-molded with a press roll to a density of 0.15 g / cm 3 , A low-density board having a thickness of 10 mm and a basis weight of 1500 g / cm 2 was obtained.

【0028】実施例9 新聞古紙と、針葉樹漂白クラフトパルプ(以下NBKP
と記す)のシ−トとを、それぞれ単独でパルプ粗砕機
(瑞光鉄工(株)製、TYPE P-160)を用いて粗砕後、パ
ルプ粉砕機(瑞光鉄工(株)製、TYPE P-270)を用いて
乾式で解繊し、古紙パルプとNBKPを得た。得られた
古紙パルプの長さ加重平均繊維長は1.07mmであり、本
数で比較した繊維長が0.4mm 以下の古紙パルプの比率
は全古紙パルプの57.5%であり、繊維長が1mm以上の
古紙パルプの比率は全古紙パルプの19.3%であった。得
られたNBKPの長さ加重平均繊維長は2.69mmであり、本
数で比較した繊維長が0.6mm以下のNBKPの比率は全NBK
Pの59.4%であり繊維長が1.5mm以上のNBKPの比率は全
NBKPの23.3%であった。得られた古紙パルプとNBKPを古
紙パルプ/NBKP=45/55の割合で配合し、長さ加重
平均繊維長1.96mmの混合パルプを得た。この混合パル
プと、乾式解繊した多分岐状合成パルプ(三井石油化学
(株)製、商品名SWP,E780)を、混合パルプ/合成パル
プ=80/20の割合で配合し、ミキサ−で均一に混合
して混合繊維体とした。合成パルプの融点は130℃、重
量平均繊維長は1.6mmであった。次に該混合繊維体を8
mmの高さのスペ−サ−を置いた熱プレス装置((株)
東洋精機製作所製、ラボプレス30T) の間に積層し10
kg/cm2の圧力、170℃の温度で10分間保持して、
低密度ボ−ドを得た。ボ−ドの密度は0.15g/cm 3 であ
り、坪量は1200g/m2であった。
Example 9 Waste newspaper and softwood bleached kraft pulp (hereinafter NBKP)
Sheet), and a pulp crusher
(Zuiko Tekko Co., Ltd., TYPE P-160)
Using a lup crusher (Type P-270 manufactured by Zuiko Tekko Co., Ltd.)
It was defibrated by a dry method to obtain waste paper pulp and NBKP. Got
The length-weighted average fiber length of waste paper pulp is 1.07 mm.
Proportion of waste paper pulp with a fiber length of 0.4 mm or less compared by number
Is 57.5% of the total waste paper pulp, and the fiber length is 1 mm or more.
The percentage of waste paper pulp was 19.3% of the total waste paper pulp. Profit
The length-weighted average fiber length of NBKP was 2.69 mm.
The ratio of NBKP with a fiber length of 0.6 mm or less compared by number is all NBK
59.4% of P and the ratio of NBKP with a fiber length of 1.5 mm or more is all
It was 23.3% of NBKP. The obtained waste paper pulp and NBKP are recycled
Paper pulp / NBKP = 45/55 blended and length weighted
A mixed pulp having an average fiber length of 1.96 mm was obtained. This mixed pal
And dry-defibrated multi-branched synthetic pulp (Mitsui Petrochemical
(Trade name SWP, E780) manufactured by K.K.
Mix at a ratio of 80/20 and mix evenly with a mixer.
To obtain a mixed fiber body. The melting point of synthetic pulp is 130 ℃,
The volume average fiber length was 1.6 mm. Next, the mixed fiber body is mixed with 8
Heat press machine with spacer of mm height (Co., Ltd.)
Layered between Toyo Seiki Seisakusho, Lab Press 30T) 10
kg / cm2Hold at 170 ℃ for 10 minutes,
A low density board was obtained. Board density is 0.15 g / cm 3 And
And the basis weight is 1200 g / m2Met.

【0029】実施例10 実施例9で得られた古紙パルプとNBKPを70/30に配
合して長さ加重平均繊維長が1.56mmの混合パルプと
し、該混合パルプと合成パルプとを80/20に配合し
て得られた繊維混合体を実施例9と同様に処理して低密
度ボ−ドを得た。
Example 10 The recycled paper pulp obtained in Example 9 and NBKP were mixed in a ratio of 70/30 to form a mixed pulp having a length weighted average fiber length of 1.56 mm, and the mixed pulp and the synthetic pulp were 80/20. The low-density board was obtained by treating the fiber mixture obtained by blending with No. 1 in the same manner as in Example 9.

【0030】実施例11 実施例9で得られた古紙パルプとNBKPを90/10に配
合して長さ加重平均繊維長が1.07mmの混合パルプと
し、該混合パルプと合成パルプとを80/20に配合し
て得られた繊維混合体を実施例9と同様に処理して低密
度ボ−ドを得た。
Example 11 The used paper pulp obtained in Example 9 and NBKP were mixed in a ratio of 90/10 to form a mixed pulp having a length weighted average fiber length of 1.07 mm, and the mixed pulp and the synthetic pulp were 80/20. The low-density board was obtained by treating the fiber mixture obtained by blending with No. 1 in the same manner as in Example 9.

【0031】比較例1 長さ加重平均長さが0.31mmであり、本数で比較した、
繊維長0.4mm以下のパルプの比率が、全パルプの95.1
%であり、1mm以上のパルプの比率が、全古紙パルプ
の1.2 %である古紙パルプを使用したた以外は、実施例
1の操作を繰り返し、低密度ボードを得た。
Comparative Example 1 The length-weighted average length was 0.31 mm, and the numbers were compared.
The ratio of pulp with a fiber length of 0.4 mm or less is 95.1% of the total pulp.
%, And the ratio of pulp of 1 mm or more was 1.2% of the total waste paper pulp, except that the waste paper pulp was used, the operation of Example 1 was repeated to obtain a low density board.

【0032】比較例2 長さ加重平均長さが0.40mmであり、本数で比較した、
繊維長0.4mm以下のパルプの比率が、全パルプの92.1
%であり、1mm以上のパルプの比率が、全古紙パルプ
の2.6%である古紙パルプを使用した以外は、実施例1
の操作を繰り返し、低密度ボードを得た。
Comparative Example 2 The length-weighted average length was 0.40 mm, and the numbers were compared.
The ratio of pulp with a fiber length of 0.4 mm or less is 92.1% of the total pulp.
%, And the ratio of pulp of 1 mm or more was 2.6% of the total waste paper pulp.
The above operation was repeated to obtain a low density board.

【0033】比較例3 水分19%の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160)を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊した
が、古紙の水分が高すぎるため、湿った紙片が塊状で多
数残り、低密度ボードの作製可能な古紙パルプは得られ
なかった。
Comparative Example 3 Newspaper waste paper having a water content of 19% was crushed by a pulp crusher (Zuiko Tekko Co., Ltd.).
Manufactured by TYPE FR-160) and then crushed by dry method using a pulp crusher (Type P-270, manufactured by Zuiko Iron Works Co., Ltd.). A large number of pieces of paper remained in a lump form, and no waste paper pulp capable of producing a low-density board was obtained.

【0034】比較例4 水分1.4 %の新聞古紙をパルプ粗砕機(瑞光鉄工(株)
製、TYPE FRー160)を用いて粗砕後、パルプ粉砕機(瑞
光鉄工(株)製、TYPE Pー270)を用いて乾式で解繊した
が、解繊した古紙パルプへの静電気の帯電が著しく、パ
ルプの飛散、解繊装置への付着、放電等のため、作業性
が著しく低下したため、以降のテストを中止した。
Comparative Example 4 Newspaper waste paper having a water content of 1.4% was crushed by a pulp crusher (Zuiko Tekko Co., Ltd.).
Made by TYPE FR-160) and then crushed by dry method using a pulp crusher (TYPE P-270, manufactured by Zuiko Iron Works Co., Ltd.). The workability was remarkably deteriorated due to the scattering of pulp, adhesion to the defibration device, discharge, etc., so the subsequent tests were stopped.

【0035】比較例5 比較例2で使用した古紙パルプを使用し、合成パルプと
して重量平均繊維長0.1mmの合成パルプ(三井石油化
学(株)製、商品名SWP 、ESS5)を使用した以外は、実
施例1の操作を繰り返し、低密度ボードを得た。
Comparative Example 5 Except that the waste paper pulp used in Comparative Example 2 was used and synthetic pulp having a weight average fiber length of 0.1 mm (manufactured by Mitsui Petrochemical Co., Ltd., trade name SWP, ESS5) was used as the synthetic pulp. The operation of Example 1 was repeated to obtain a low density board.

【0036】比較例6 合成パルプを使用せず、合成パルプの代わりにフェノー
ル樹脂微粉末を使用した以外は、実施例1の操作を繰り
返したが、フェノール樹脂粉末の飛散と、フェノールお
よびフォルマリン臭が著しく、低密度ボードの作製を中
止した。
Comparative Example 6 The procedure of Example 1 was repeated except that the synthetic pulp was not used and the phenolic resin fine powder was used instead of the synthetic pulp, but the dispersion of the phenolic resin powder and the odors of phenol and formalin were observed. However, the production of the low density board was stopped.

【0037】比較例7 比較例2で使用した古紙パルプを用い、該古紙パルプと
合成パルプの配合比を、古紙パルプ/合成パルプ=50/
50にした以外は、実施例1の操作を繰り返したが、熱プ
レスによる加熱加圧処理により、多量の合成パルプが溶
解するために、表面が不均一でざらついた状態となり、
得られた低密度ボードも厚さ方向で密度勾配が生じ、更
に硬いために、緩衝材としては使用できないものであっ
た。
Comparative Example 7 Using the waste paper pulp used in Comparative Example 2, the mixing ratio of the waste paper pulp and the synthetic pulp was as follows: waste paper pulp / synthetic pulp = 50 /
The operation of Example 1 was repeated except that the amount was changed to 50. However, the heating and pressurizing treatment by a hot press caused a large amount of synthetic pulp to dissolve, resulting in a non-uniform and rough surface.
The obtained low-density board also had a density gradient in the thickness direction and was harder, so it could not be used as a cushioning material.

【0038】比較例8 比較例2で使用した 古紙パルプと、乾式で解繊され乾
燥された合成パルプ(三井石油化学(株)製、商品名SW
P 、E990)を、古紙パルプ/合成パルプ=80/20の割合
で配合し、ミキサ−で均一に混合して混合繊維を得た。
合成パルプの融点は130℃、重量平均繊維長は2.1mmで
あり、水分は5%であった。
Comparative Example 8 The waste paper pulp used in Comparative Example 2 and a synthetic pulp defibrated by a dry method and dried (manufactured by Mitsui Petrochemical Co., Ltd., trade name SW
P and E990) were blended at a ratio of waste paper pulp / synthetic pulp = 80/20 and uniformly mixed by a mixer to obtain a mixed fiber.
The melting point of the synthetic pulp was 130 ° C., the weight average fiber length was 2.1 mm, and the water content was 5%.

【0039】次に、該混合繊維を4mmの高さのスペー
サを置いた熱プレス装置((株)東洋精機製作所製、ラ
ボプレス30T)の間に積層し、50kg/cm2の圧力、17
0℃の温度で15分間保持し、ボードを得た。得られたボ
ードの密度は0.6g/cm3であり、坪量は2400g/m2
であった。実施例1〜11、比較例1〜8で得られたシ
ートを下記の試験方法で試験し、その品質を評価した。
製造条件を表1に示す。
Next, the mixed fiber was laminated between a hot press machine (Labo Press 30T, manufactured by Toyo Seiki Seisakusho Co., Ltd.) with a spacer having a height of 4 mm, and a pressure of 50 kg / cm 2 was applied for 17 minutes.
The board was obtained by holding at a temperature of 0 ° C. for 15 minutes. The obtained board had a density of 0.6 g / cm 3 and a basis weight of 2400 g / m 2.
Met. The sheets obtained in Examples 1 to 11 and Comparative Examples 1 to 8 were tested by the following test method to evaluate their quality.
The manufacturing conditions are shown in Table 1.

【0040】[0040]

【表1】 また評価結果を表2に示す。[Table 1] The evaluation results are shown in Table 2.

【0041】[0041]

【表2】 [Table 2]

【0042】試験方法 (1)古紙パルプの、長さ平均加重長さおよび繊維長分
布:バルメット・オートメーション社製、カヤニー繊維
長測定機(FSー2000)を用いて測定。 (2)熱性微細繊維の重量平均繊維長:JIS P8207 に
示された装置を用い、TAPPI T233に示された方法で測
定。 (3)坪量:JIS P8126 に示された方法を用いて測
定。 (4)密度:JIS P8118 に示された方法を用いて測
定。 (5)引張強度:JIS P8113 に示された方法を用いて
測定。 (6)L型成型性:L型金具2枚にサンプルを曲げては
さみ、しやこ万力ではさんで固定後、170 ℃で10分保持
したものにつき、L型成型性を以下の5段階で評価し
た。 5・・・ 成型後の戻りや曲げ部分のひび割れが全くなく極
めて良好である。 4・・・ 成型性が良好である。 3・・・ 成型性が普通である。 2・・・ 成型後に戻りがあり、ひび割れも目立つ。 1・・・ 成型性が全くない。
Test method (1) Length-average weighted length and fiber length distribution of waste paper pulp: Measured using a Kayaney fiber length measuring machine (FS-2000) manufactured by Valmet Automation. (2) Weight average fiber length of heat-sensitive fine fibers: measured by the method shown in TAPPI T233 using the device shown in JIS P8207. (3) Basis weight: measured by the method shown in JIS P8126. (4) Density: Measured using the method shown in JIS P8118. (5) Tensile strength: Measured using the method shown in JIS P8113. (6) L-shaped moldability: The sample was bent and sandwiched between two L-shaped metal fittings, fixed with a Sayako vise, and held at 170 ° C for 10 minutes. evaluated. 5 ... Very good with no return after molding or cracks in the bent portion. 4 ... Good moldability. 3 ... Moldability is normal. 2. There is a return after molding, and cracks are also noticeable. 1 ... There is no moldability at all.

【0043】(7)表面性:作製したボードの表面性を
官能で評価した。評価は次の5段階で行った。 5・・・ 表面性が極めて良好である。 4・・・ 表面性が良好である。 3・・・ 表面性が普通である。 2・・・ 表面がざらつき、繊維の脱落が多い。 1・・・ 表面が極めて不良である。 (8)ボード成型性:低密度ボード作製の可否を次の3
段階で評価した。 ○・・・ ボードの作製が容易である。 △・・・ ボードの作製がやや難しい。 ×・・・ ボードの作製ができない。 (9)ボード緩衝性:低密度ボードの緩衝性能を官能評
価で、次の5段階で評価した。 5・・・ 緩衝性が極めて良好である。 4・・・ 緩衝性が良好である。 3・・・ 緩衝性が普通である。 2・・・ 緩衝性が劣る。 1・・・ 緩衝性が極めて劣る。
(7) Surface property: The surface property of the produced board was evaluated functionally. The evaluation was carried out in the following five stages. 5: The surface property is extremely good. 4 ... Good surface property. 3 ... The surface property is normal. 2 ... The surface is rough and the fibers often fall off. 1 ... The surface is extremely defective. (8) Board moldability: Whether or not low density boards can be manufactured
The grade was evaluated. ○: Boards are easy to manufacture. △: Making a board is a little difficult. × ・ ・ ・ The board cannot be manufactured. (9) Board buffering property: The buffering performance of the low density board was evaluated by sensory evaluation according to the following five grades. 5 ... Very good buffering property. 4 ... Good buffering property. 3 ... Buffering property is normal. 2 ... Inferior in buffer property. 1 ... The buffering property is extremely poor.

【0044】表1および表2から明らかなように、実施
例1〜11と比較例1〜8を比較すると、実施例1〜1
1では良好な低密度ボードが容易に得られた。一方比較
例1においては、古紙パルプの平均繊維長が短く、繊維
長0.4mm以下のパルプの比率が高いために、ボード作
製時に微細なパルプ粉末が多量に飛散し、作業環境は極
めて劣っており、更に、得られたボードの強度や表面性
も劣っていた。また比較例2においても、繊維長0.4m
m以下のパルプの比率が高いために、比較例1と同様な
問題があった。また比較例3においては、水分値の高い
古紙を解繊処理したために、解繊後も湿った紙片が塊状
に多数残り、低密度ボードの作製可能な古紙パルプが得
られず、比較例4においては、古紙の水分が低すぎたた
めに、解繊した古紙パルプへの静電気の帯電が著しく、
パルプの飛散、解繊装置への付着、放電等により、作業
性が著しく低下した。また比較例5においては、使用し
た熱性樹脂微細繊維の繊維長が短か過ぎたために、作製
した低密度ボードの強度が大幅に低下し、比較例6では
熱性樹脂微細繊維の代わりに、フェノール樹脂微粉末を
使用したために、フェノール樹脂の飛散トラブルや強い
フェノール臭、フォルマリン臭のため、作業性が大幅に
低下した。更に、比較例7においては、熱性微細繊維の
配合率が高いために、表面性が劣り、硬く、緩衝性能も
劣っており、比較例8においては、作製したボードの密
度が高いために、緩衝材としては不適当であった。なお
実施例9、10、11では針葉樹パルプを配合したの
で、針葉樹パルプを配合しなかった実施例1〜8で得ら
れた低密度ボ−ドよりも、強度の優れた製品が得られ
た。
As is clear from Tables 1 and 2, comparing Examples 1 to 11 with Comparative Examples 1 to 8, Examples 1 to 1 are compared.
In No. 1, a good low density board was easily obtained. On the other hand, in Comparative Example 1, since the average fiber length of the waste paper pulp is short and the ratio of pulp having a fiber length of 0.4 mm or less is high, a large amount of fine pulp powder is scattered at the time of making the board, and the working environment is extremely poor. Moreover, the strength and surface properties of the obtained board were inferior. Also in Comparative Example 2, the fiber length is 0.4 m.
Since the ratio of pulp of m or less was high, there was the same problem as in Comparative Example 1. Further, in Comparative Example 3, since waste paper having a high water content was defibrated, many pieces of wet paper remained in a lump after defibration, and waste paper pulp capable of producing a low-density board was not obtained. Is because the water content of the waste paper is too low, the electrostatic charge on the disentangled waste paper pulp is remarkable,
The workability was significantly reduced due to the scattering of pulp, the adhesion to the defibration device, the discharge, and the like. Further, in Comparative Example 5, the strength of the manufactured low-density board was significantly reduced because the fiber length of the thermosetting resin fine fibers used was too short. In Comparative Example 6, instead of the thermosetting resin fine fibers, a phenol resin was used. Since the fine powder was used, the workability was significantly reduced due to the scattering problems of the phenol resin, the strong phenol odor, and the formalin odor. Further, in Comparative Example 7, since the blending ratio of the thermophilic fine fibers is high, the surface property is poor, the hardness is poor, and the buffering performance is also poor. In Comparative Example 8, since the density of the produced board is high, the buffering is performed. It was unsuitable as a material. Since softwood pulp was blended in Examples 9, 10, and 11, a product having higher strength than the low-density boards obtained in Examples 1 to 8 in which softwood pulp was not blended was obtained.

【0045】[0045]

【発明の効果】以上説明したように本発明により、長さ
加重平均繊維長が特定値より長い古紙パルプに熱性樹脂
微細繊維を乾式で配合した繊維集合体を、該樹脂繊維の
融点より高い温度で加熱、加圧成型し得られるボ−ド
は、緩衝性が大きく成型性が優れ強度も高く、緩衝材や
断熱材として好適な低密度ボ−ドである。さらに針葉樹
パルプを配合することにより、ボ−ドの強度や成型性を
向上させることが出来る。また本発明によれば、古紙を
有効に利用することが可能であり、得られる低密度ボ−
ドは、従来から使用されているポリスチレン発泡体等に
比較して燃焼エネルギ−が低く、有毒ガスを発生せず、
土中に埋めた場合には土中の微生物により容易に分解す
る。さらに使用済みの低密度ボ−ドは、パルプ原料とし
て容易に再利用することも出来る。
As described above, according to the present invention, a fiber assembly obtained by dry-blending a thermosetting resin fine fiber into a waste paper pulp having a length-weighted average fiber length longer than a specific value is used at a temperature higher than the melting point of the resin fiber. The board obtained by heating and press-molding is a low-density board suitable for use as a cushioning material and a heat insulating material because it has a large cushioning property, excellent moldability, and high strength. Further, by blending softwood pulp, the strength and moldability of the board can be improved. Further, according to the present invention, it is possible to effectively use the waste paper, and the obtained low-density paper is used.
De has a lower combustion energy than conventional polystyrene foams and the like, does not generate toxic gas,
When buried in the soil, it is easily decomposed by microorganisms in the soil. Further, the used low density board can be easily reused as a pulp raw material.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B27K 5/00 F 9123−2B B27N 1/02 9123−2B D04H 1/42 F 1/54 B ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B27K 5/00 F 9123-2B B27N 1/02 9123-2B D04H 1/42 F 1/54 B

Claims (8)

【特許請求の範囲】[Claims] 【請求項1】 古紙を水を用いず空気中で乾式解繊した
古紙パルプと、熱可塑性樹脂の微細繊維とを、乾式で混
合した繊維集合体を、該熱可塑性樹脂の融点以上の温度
で加熱加圧成型することにより、該熱可塑性樹脂微細繊
維の一部または全部を溶解し、古紙パルプ同士を結合さ
せた低密度ボードであって、解繊後の古紙パルプの長さ
加重平均長さ(length-weighted average length)が、
0.5mm 以上であることを特徴とする低密度ボ−ド。
1. A fiber assembly obtained by dry-mixing waste paper pulp obtained by dry defibration of waste paper in air without using water at a temperature not lower than the melting point of the thermoplastic resin. A low-density board in which a part or all of the thermoplastic resin fine fibers are melted by heating and pressing to bond waste paper pulp to each other, and the length-weighted average length of waste paper pulp after defibration is used. (Length-weighted average length) is
Low density board characterized by being 0.5 mm or more.
【請求項2】 前記古紙パルプに長さ加重平均長さが0.
7mm以上の針葉樹パルプを配合し、乾燥状態における
重量比率が、古紙パルプ/針葉樹パルプ=95〜40/5 〜
60の範囲とすることを特徴とする特許請求項1に記載の
低密度ボ−ド。
2. The length-weighted average length of the waste paper pulp is 0.
Blended with softwood pulp of 7 mm or more, the weight ratio in the dry state is waste paper pulp / softwood pulp = 95-40 / 5-
The low density board according to claim 1, wherein the low density board has a range of 60.
【請求項3】 本数で比較した繊維長が0.4mm以下の
古紙パルプの比率が、全古紙パルプの90%以下であり、
1mm以上の古紙パルプの比率が、全古紙パルプの3 %
以上であることを特徴とする、特許請求項1または2項
に記載の低密度ボード。
3. The ratio of waste paper pulp having a fiber length of 0.4 mm or less compared with the number of fibers is 90% or less of all waste paper pulp,
The ratio of waste paper pulp with a diameter of 1 mm or more is 3% of the total waste paper pulp.
It is above, The low density board of Claim 1 or 2 characterized by the above-mentioned.
【請求項4】 本数で比較した繊維長が0.4mm以下の
古紙パルプの比率が、全古紙パルプの90%以下であ
り、1mm以上の古紙パルプの比率が全古紙パルプノ3
%以下である古紙パルプと、本数で比較した繊維長が0.
6mm以下の針葉樹パルプの比率が全針葉樹パルプの8
0%以下であり、1.5mm以上の針葉樹パルプの比率が
全針葉樹パルプの5%以上である針葉樹パルプとを配合
することを特徴とする特許請求項2に記載の低密度ボ−
ド。
4. The ratio of used paper pulp having a fiber length of 0.4 mm or less in terms of the number of fibers is 90% or less of the total used paper pulp, and the ratio of used paper pulp of 1 mm or more is used in the total used paper pulp 3.
The fiber length is 0 when compared with the number of recycled paper pulp that is less than or equal to%.
The ratio of softwood pulp of 6 mm or less is 8 of all softwood pulp.
The low density boule according to claim 2, which is 0% or less and is blended with a softwood pulp in which the ratio of the softwood pulp of 1.5 mm or more is 5% or more of the total softwood pulp.
De.
【請求項5】 熱可塑性樹脂の微細繊維が、重量平均繊
維長0.2 〜15mmのポリオレフィン系樹脂からなる、パ
ルプ状多分岐繊維であることを特徴とする、特許請求項
1、2、3または4項のいずれかに記載の低密度ボー
ド。
5. The pulp-like multi-branched fiber made of a polyolefin resin having a weight average fiber length of 0.2 to 15 mm, wherein the thermoplastic resin fine fibers are pulp-like multi-branched fibers. The low-density board according to any one of items.
【請求項6】 古紙パルプが、水分含有率が2 〜15%の
範囲である古紙を、乾式で解繊したパルプであることを
特徴とする、特許請求項1、2、3または4項のいずれ
かに記載の低密度ボード。
6. The used paper pulp is a pulp obtained by dry-defibrating used paper having a water content in the range of 2 to 15%, according to claim 1, 2, 3 or 4. The low-density board according to any one.
【請求項7】 古紙パルプと熱可塑性樹脂の微細繊維が
混合された繊維集合体を、加熱処理中あるいは加熱処理
後に、加圧することにより、密度を0.01〜0.4g/cm3
の範囲にすることを特徴とする、特許請求項1、2、
3、または4項のいずれかに記載の低密度ボード。
7. A density of 0.01 to 0.4 g / cm 3 is obtained by pressurizing a fiber assembly in which waste paper pulp and fine fibers of a thermoplastic resin are mixed, during or after heat treatment.
Claims 1 and 2, characterized in that
The low-density board according to any one of items 3 and 4.
【請求項8】 古紙パルプと熱可塑性樹脂微細繊維の絶
乾状態の重量比が、古紙パルプ/微細繊維=95〜60/5
〜40であることを特徴とする、特許請求項1、2、3、
4または5項のいずれかに記載の低密度ボード。
8. The weight ratio of waste paper pulp and thermoplastic resin fine fibers in an absolutely dry state is as follows: waste paper pulp / fine fibers = 95-60 / 5
~ 40, claim 1, 2, 3,
The low-density board according to any one of items 4 and 5.
JP6229615A 1994-09-26 1994-09-26 Low-density board Pending JPH0890521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6229615A JPH0890521A (en) 1994-09-26 1994-09-26 Low-density board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6229615A JPH0890521A (en) 1994-09-26 1994-09-26 Low-density board

Publications (1)

Publication Number Publication Date
JPH0890521A true JPH0890521A (en) 1996-04-09

Family

ID=16894965

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6229615A Pending JPH0890521A (en) 1994-09-26 1994-09-26 Low-density board

Country Status (1)

Country Link
JP (1) JPH0890521A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013540913A (en) * 2010-10-26 2013-11-07 ゼオ アイピー プロプライエタリー リミテッド Cellulose fiber composition
JP2015172265A (en) * 2014-03-12 2015-10-01 セイコーエプソン株式会社 Sheet manufacturing device
JP2015183320A (en) * 2014-03-25 2015-10-22 セイコーエプソン株式会社 Sheet production apparatus and sheet production method
JP2015183336A (en) * 2014-03-26 2015-10-22 セイコーエプソン株式会社 Sheet production apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013540913A (en) * 2010-10-26 2013-11-07 ゼオ アイピー プロプライエタリー リミテッド Cellulose fiber composition
JP2015172265A (en) * 2014-03-12 2015-10-01 セイコーエプソン株式会社 Sheet manufacturing device
JP2015183320A (en) * 2014-03-25 2015-10-22 セイコーエプソン株式会社 Sheet production apparatus and sheet production method
JP2015183336A (en) * 2014-03-26 2015-10-22 セイコーエプソン株式会社 Sheet production apparatus

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