JP4280794B2 - Method for producing molded product derived from cotton fiber and molded product derived from cotton fiber - Google Patents
Method for producing molded product derived from cotton fiber and molded product derived from cotton fiber Download PDFInfo
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- 229920000742 Cotton Polymers 0.000 title claims description 78
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 239000000835 fiber Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 10
- 239000003205 fragrance Substances 0.000 claims description 3
- 239000000975 dye Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 description 14
- 244000299507 Gossypium hirsutum Species 0.000 description 13
- 229920003023 plastic Polymers 0.000 description 10
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Nonwoven Fabrics (AREA)
- Paper (AREA)
Description
本発明は環境に優しい綿繊維由来の成形物に関し、特に、合成樹脂プラスチックにより構成される成形物の代替品として用いることのできる、綿繊維由来の成形物に関する。 The present invention relates to an environmentally friendly molded product derived from cotton fibers, and more particularly to a molded product derived from cotton fibers that can be used as an alternative to molded products made of synthetic resin plastics.
近年、社会生活を営むことにより発生する様々な材料や製品の廃棄物が地球全体の問題となり、環境汚染の観点から、その処理が重要な課題として捕らえられるようになっている。 In recent years, wastes of various materials and products generated by conducting social life have become a problem for the entire earth, and from the viewpoint of environmental pollution, the treatment has been regarded as an important issue.
ところで、我々の生活において重要な地位を占める材料として、合成樹脂のプラスチックが挙げられる。該プラスチックは、軽くて強い、成形が容易、腐食しにくい、水・気体を通さない、電気絶縁性・耐熱性に優れているなどの性質を有しており、その利便性から生産量は年々増加している。 By the way, as a material that occupies an important position in our lives, synthetic resin plastics can be cited. The plastics are light and strong, easy to mold, difficult to corrode, impervious to water and gas, and have excellent electrical insulation and heat resistance. It has increased.
ところが合成樹脂のプラスチックのリサイクルシステムは十分に整っておらず、廃プラスチックの多くは焼却・埋め立てなどの方法で処理されてきた。しかし、焼却により処理すると、ダイオキシンが発生したり、高温の排熱により焼却炉を傷めるなどの問題が発生する。また、埋め立て処理をした場合には、ほとんど分解されずに数百年単位の長期にわたり原形のまま残ってしまうという環境問題が生じている。 However, plastic recycling systems for synthetic resins are not well established, and most waste plastics have been treated by methods such as incineration and landfilling. However, treatment by incineration causes problems such as generation of dioxins and damage of the incinerator due to high-temperature exhaust heat. Moreover, when the landfill process is performed, there is an environmental problem that the original form remains for a long period of several hundred years without being almost decomposed.
そのような事情に鑑み、土壌などの環境中で微生物などの働きにより分解される、生分解性プラスチックによる成形物が提案されている(例えば特許文献1)。 In view of such circumstances, a molded article made of biodegradable plastics that is decomposed by the action of microorganisms in an environment such as soil has been proposed (for example, Patent Document 1).
特許文献1に記載の発明は、穀類、雑草等の植物繊維、砂糖キビ、パイナップル又は海藻類等の100%天然素材を微細化した主材と、柿渋、コンニャク粉、松ヤニ又はウルシ等の100%天然素材からなるバインダーとを水を介して混合し、所定形状に乾燥固化して構成したことを特徴とする生分解性プラスチックである。当該成形物は、生分解により加工品全体が環境中で分解されうるため、土壌汚染や大気汚染の発生を防止できる。 The invention described in Patent Document 1 includes a main material obtained by refining 100% natural material such as plant fibers such as cereals and weeds, sugar millet, pineapple or seaweed, and 100 such as persimmon astringent, konjac flour, pine crabs or urushi. It is a biodegradable plastic characterized in that it is made by mixing with a binder made of% natural material through water and drying and solidifying into a predetermined shape. Since the entire processed product can be decomposed in the environment by biodegradation, the molded product can prevent soil contamination and air pollution.
しかしながら、特許文献1に記載の発明は、その製造工程において植物繊維などの主材のほかに主材を吸着させるためのバインダーを必要とし、このバインダーを、土壌などの環境中において微生物により分解させるためには、100%の天然素材で構成する必要がある。すなわち、該成形物を製造するためには、主材のほかに天然物からバインダーの原料を取得する工程と、この取得した原料からバインダーを製造する工程とが必要とされる。したがって、成形物を製造するのに手間がかかる。
本発明は、このような事情に基づきなされたものであり、その目的は環境に配慮した、合成樹脂製のプラスチックに代わる新規な成形物を提供することにある。 The present invention has been made based on such circumstances, and an object of the present invention is to provide a novel molded article that replaces the plastic made of synthetic resin in consideration of the environment.
また、従来よりも簡単な方法で合成樹脂製のプラスチックに代わる新規な成形物を製造することを目的とする。 Another object of the present invention is to produce a new molded article replacing plastic made of synthetic resin by a simpler method than before.
上記課題を解決するために、第1の発明は綿綿繊維由来の成形物の製造方法であって、綿繊維を平均繊維長0.3mm以下となるようにフィブリル化し、このフィブリル化綿繊維を80〜90%の含水率で水とともに攪拌し、この攪拌物を乾燥固化させて成形物を得ることを特徴とする。 In order to solve the above-mentioned problem, the first invention is a method for producing a molded product derived from cotton fibers, in which the cotton fibers are fibrillated to an average fiber length of 0.3 mm or less, and the fibrillated cotton fibers are 80 The mixture is stirred with water at a water content of ˜90%, and the mixture is dried and solidified to obtain a molded product .
第2の発明は、第1の発明において、型枠内で前記攪拌物を乾燥固化させることを特徴とする。また、第3の発明は、第1及び第2の発明において該成形物の見かけの比重を1.2g/cm3以上とすることを特徴とする。さらに、第4の発明は、第1〜第3の発明における攪拌工程において芳香剤を混入して、該成形物を香り付けすることを特徴とする。さらにまた、第5の発明は、第1〜第4の発明における攪拌工程において染色剤を混入して、該成形物を色付けすることを特徴とする。A second invention is characterized in that, in the first invention, the agitated material is dried and solidified in a mold. The third invention is characterized in that the apparent specific gravity of the molded product is 1.2 g / cm 3 or more in the first and second inventions. Further, the fourth invention is characterized in that a fragrance is mixed in the stirring step in the first to third inventions to scent the molded product. Furthermore, the fifth invention is characterized in that the molded product is colored by mixing a staining agent in the stirring step in the first to fourth inventions.
本願発明によれば、成形物を綿繊維により構成することができるため、地中に廃棄しても環境汚染の問題が生じない。しかも、この成形物を得るために、バインダー等の固化材を添加する必要がないため、製造工程を簡素化してコストを削減することができる。 According to the present invention, since the molded product can be composed of cotton fibers, there is no problem of environmental pollution even if it is disposed in the ground. And since it is not necessary to add solidification materials, such as a binder, in order to obtain this molded object, a manufacturing process can be simplified and cost can be reduced.
以下、添付図面を参照しながら本発明の好適な実施形態について詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
本願発明の実施形態である綿繊維由来の成形物の製造方法は、綿繊維を石臼などの微裁断装置により平均繊維長が0.3mm以下となるようにフィブリル化し、このフィブリル化された綿繊維を80〜90%の含水率で水とともに攪拌し、この攪拌物を乾燥固化させて成形物を得ることを特徴とする。これにより、合成樹脂製のプラスチックに代わる新規な成形物を得ることができる。この新規な成形物は、地中内に生息する微生物などにより自然分解されるため、地中に廃棄しても安全上の問題は生じない。さらに、成形物を得るために、綿繊維にバインダーなどの固化材料(粘性材料)を添加する必要がないため、製造工程を簡素化して、コストを削減することができる。 In the method for producing a molded product derived from cotton fibers according to an embodiment of the present invention, the cotton fibers are fibrillated with a fine cutting device such as a stone mill so that the average fiber length is 0.3 mm or less, and the fibrillated cotton fibers. Is stirred together with water at a water content of 80 to 90%, and this stirred product is dried and solidified to obtain a molded product. As a result, a novel molded product can be obtained in place of the plastic made of synthetic resin. Since this new molded product is naturally decomposed by microorganisms that inhabit the ground, there is no safety problem even if it is disposed in the ground. Furthermore, since it is not necessary to add a solidifying material (viscous material) such as a binder to the cotton fiber in order to obtain a molded product, the manufacturing process can be simplified and the cost can be reduced.
次に、図1を参照しながら、本実施形態の綿繊維由来の成形物の製造方法について、詳細に説明する。ここで、図1は、本実施形態の綿繊維由来の成形物の製造方法を有効に実施するための製造システムを示したブロック図である。 Next, the manufacturing method of the molding derived from the cotton fiber of this embodiment will be described in detail with reference to FIG. Here, FIG. 1 is a block diagram showing a manufacturing system for effectively carrying out the method for manufacturing a molded product derived from cotton fibers of the present embodiment.
まず、フィブリル化を行う前に、原料となる綿繊維の前処理を行う。図1に示すように、複数のローラーカードを使用して、原綿若しくは晒し綿から目付け150〜180g/m2の薄綿帯を生成する。続いて、圧力4.0g/m2で圧縮処理を行うことによりエンボス加工して、ペーパ状の綿帯を生成する。これをシュレッダーで縦方向(綿帯の長手方向)及び横方向(綿帯の幅方向)に裁断処理することにより、一辺の長さを3〜4mmとした角型の綿帯の切片を生成する。First, before performing the fibrillation, pretreatment of the cotton fiber as a raw material is performed. As shown in FIG. 1, a thin cotton strip having a basis weight of 150 to 180 g / m 2 is produced from raw cotton or bleached cotton using a plurality of roller cards. Subsequently, embossing is performed by performing a compression treatment at a pressure of 4.0 g / m 2 to generate a paper-like cotton band. By cutting this with a shredder in the longitudinal direction (longitudinal direction of the cotton band) and in the lateral direction (width direction of the cotton band), a piece of rectangular cotton band having a side length of 3 to 4 mm is generated. .
次に、マスコロイダーを用いて綿繊維をフィブリル化する。このマスコロイダーは、上下一対の上側及び下側石臼から構成されており、上側石臼は固定され、下側石臼は下側石臼の中心軸周りに回転可能に構成されている。また、上側石臼には、不図示の材料投入口が上下方向に延びて設けられており、綿帯の切片はこの材料投入口を介してマスコロイダー内に投入される。上側及び下側石臼の間隔は20〜200μmに設定されており、上側の石臼の回転速度は、1200〜1800rpmに速度制御される。ここで、フィブリル化とは、綿繊維を縦方向に切り裂いて短繊維にすることを意味し、本実施形態では、フィブリル化した綿繊維の平均繊維長が0.3mm以下となるように裁断条件を設定している。この理由については後述する。 Next, the cotton fiber is fibrillated using a mascolloider. The mass collider is composed of a pair of upper and lower upper and lower stones, the upper stone is fixed, and the lower stone is configured to be rotatable around the central axis of the lower stone. Further, the upper stone mill is provided with a material input port (not shown) extending in the vertical direction, and a piece of cotton band is input into the mass collider through the material input port. The distance between the upper and lower millstones is set to 20 to 200 μm, and the rotational speed of the upper millstone is controlled to 1200 to 1800 rpm. Here, fibrillation means that the cotton fibers are cut in the longitudinal direction into short fibers, and in this embodiment, the cutting conditions are such that the average fiber length of the fibrillated cotton fibers is 0.3 mm or less. Is set. The reason for this will be described later.
フィブリル化綿繊維の製造にあたっては、作業を円滑に進めるために多量の水をマスコロイダーに供給する必要がある。このマスコロイダーへの水の供給は、材料投入口を介して綿繊維の磨砕状況を目視により確認しながら行う。フィブリル化した綿繊維は、供給された水と混合して濃度の低い水懸濁液の状態となる。この水懸濁液をフィルターに通して、余分な水を排除することにより、含水率を80〜90%としたペースト状の繊維塊(以下、ペースト綿繊維塊という)を生成することができる。 In the production of fibrillated cotton fibers, it is necessary to supply a large amount of water to the mass collider in order to facilitate the work. The supply of water to the mass collider is performed while visually confirming the grinding state of the cotton fibers through the material inlet. The fibrillated cotton fibers are mixed with the supplied water to form a low-concentration aqueous suspension. By passing this water suspension through a filter and removing excess water, a paste-like fiber lump (hereinafter referred to as paste cotton fiber lump) having a moisture content of 80 to 90% can be generated.
続いて、ペースト綿繊維塊を性状調整する。具体的には、ペースト綿繊維塊をビニル袋に入れ、このビニル袋を振とうさせることにより、十分に攪拌する。この攪拌作業は、ペースト綿繊維塊内にフィブリル化綿繊維が概ね均一に分布するまで行い、均一に分布したかどうかは目視により判断する。 Subsequently, the properties of the paste cotton fiber mass are adjusted. Specifically, the paste cotton fiber lump is put in a vinyl bag, and the vinyl bag is shaken to sufficiently stir. This stirring operation is performed until the fibrillated cotton fibers are almost uniformly distributed in the paste cotton fiber lump, and it is visually determined whether or not the fibers are uniformly distributed.
最後に、攪拌したペースト綿繊維塊を乾燥固化して成形化する。ペースト綿繊維塊を任意の形状の型枠内に入れ、へらで表面を均した後、乾燥部に送り込む。乾燥温度は、好ましくは30〜75℃、より好ましくは50〜60℃に設定する。乾燥部内に送り込まれたペースト綿繊維塊は、徐々に水分を失って収縮しながら固化する。このように、ペースト綿繊維塊を乾燥させるだけで、綿繊維由来の成形物を得ることができる。これにより、バインダーなどの固化材を不要とすることができる。 Finally, the stirred paste cotton fiber mass is dried and solidified to form. The paste cotton fiber lump is put into a mold of an arbitrary shape, the surface is leveled with a spatula, and then sent to the drying section. The drying temperature is preferably set to 30 to 75 ° C, more preferably 50 to 60 ° C. The paste cotton fiber mass fed into the drying section gradually loses moisture and solidifies while shrinking. Thus, a cotton fiber-derived molded product can be obtained simply by drying the paste cotton fiber mass. Thereby, solidification materials, such as a binder, can be made unnecessary.
ここで、フィブリル化綿繊維の繊維長を0.3mm以下にするとともに、含水率を80〜90質量%とするとした理由は以下の通りである。 Here, the reason why the fiber length of the fibrillated cotton fiber is 0.3 mm or less and the water content is 80 to 90% by mass is as follows.
まず、綿繊維の繊維長が短ければ、密度と緊密の程度が高くなる。また、含水率が高ければ収縮すなわち各繊維の絡みつきによる結束力が高まる。そして、乾燥工程において綿繊維に含まれる水分が蒸発すると、綿繊維の収縮及び結束の作用が停止するものと考えられる。 First, if the fiber length of the cotton fiber is short, the degree of density and tightness becomes high. Moreover, if the moisture content is high, the binding force due to shrinkage, that is, entanglement of each fiber, increases. And if the water | moisture content contained in a cotton fiber evaporates in a drying process, it will be thought that the shrinkage | contraction and binding action of a cotton fiber stop.
このため、乾燥後の成形物は繊維の密度と緊密度が高くなり、乾燥工程において綿繊維が収縮および結束しても隙間が生じにくい。また、乾燥固化、つまり各フィブリル化綿繊維が絡みつくのに十分な時間が確保されるため、繊維の結束力を強くすることができる。これにより、合成樹脂製のプラスチックに代替可能な成形物を得ることができる。 For this reason, the molded product after drying has high fiber density and tightness, and even if the cotton fiber shrinks and binds in the drying process, a gap is hardly generated. Moreover, since sufficient time is secured for drying and solidifying, that is, each fibrillated cotton fiber is entangled, the binding force of the fibers can be increased. Thereby, it is possible to obtain a molded product that can be substituted for plastic made of synthetic resin.
したがって、本実施形態の成形物は、例えば電子機器の筐体、使い捨ての食器など、所定の成形性と、強度を必要とする製品に利用できる。 Therefore, the molded product of the present embodiment can be used for products that require a predetermined moldability and strength, such as a casing of an electronic device and a disposable tableware.
なお、後述する実施例においては、見かけの比重を基準として成形性を評価した。見かけの比重を基準とした理由については後述する。含水率を90%より大きくした場合でも、見かけの比重は成形性が良好であると判断する基準値とした1.2g/cm3を満足するが、乾燥固化する間に繊維と水が分離して部分的に含水率のむらが生じる。In the examples described later, the moldability was evaluated based on the apparent specific gravity. The reason based on the apparent specific gravity will be described later. Even when the water content is greater than 90%, the apparent specific gravity satisfies 1.2 g / cm 3 as a reference value for determining that the moldability is good, but the fibers and water are separated during drying and solidification. In part, the moisture content is uneven.
図2は本実施形態によって製造された成形物の斜視図であり、(a)は食事用のスプーンであり、(b)は食事用のフォークであり、(c)は幼児用玩具であり(d)は幼児用トイレである。 FIG. 2 is a perspective view of a molded product manufactured according to the present embodiment, wherein (a) is a meal spoon, (b) is a meal fork, and (c) is an infant toy ( d) is an infant toilet.
図2(c)に示すような幼児用玩具は、幼児が口の中に誤って含んだ場合であっても、安全上の問題が生じないように配慮する必要がある。この点、本実施例の成形物は綿繊維のみから製造されていることにより、誤って飲み込んでも体内の水分により軟性を有するようになるため、高い安全性を有している。 The toy for infants as shown in FIG. 2 (c) needs to be considered so as not to cause a safety problem even if the infant is accidentally included in the mouth. In this respect, since the molded product of this example is made of only cotton fibers, it has high safety even if it is swallowed by mistake, so that it has softness due to moisture in the body.
本成形物は、フィブリル化した綿繊維を水とともに攪拌することによってペースト化し
、このペースト化物を所定の形状となるように乾燥固化させることにより得ることができるため、極めて簡単に、且つ、低コストで製造することができる。また、綿繊維のみを原料としているため、環境中に廃棄されると微生物や分解酵素によって自然消滅し、環境上の問題も生じない。Since this molded product can be obtained by making fibrillated cotton fibers into a paste by stirring together with water and drying and solidifying this pasted product into a predetermined shape, it is extremely simple and low cost. Can be manufactured. In addition, since only cotton fiber is used as a raw material, when it is disposed in the environment, it is naturally disappeared by microorganisms and degrading enzymes, and there is no environmental problem.
なお、本実施形態においては、裁断して生成した綿帯の切片をマスコロイダーに投入しているが、これに限定されるものではなく、例えば綿繊維の小塊を投入するようにしてもよい。また、マスコロイダーの種類や回転速度などは、綿繊維の種類などに応じて、適宜変更することができる。 In the present embodiment, the cut piece of the cotton band that is cut and formed is put into the mass colloider. However, the present invention is not limited to this. For example, a small piece of cotton fiber may be put in. . In addition, the type and rotation speed of the mass collider can be appropriately changed according to the type of cotton fiber and the like.
さらに、本実施形態においては型枠に流し込むことにより成形化したが、乾燥固化した綿繊維の塊を所定形状に切り出し加工したり、ヤスリを用いて研削処理を行うことにより成形を行うようにすることもできる。 Further, in the present embodiment, it is formed by pouring into a mold, but the dried and solidified cotton fiber lump is cut into a predetermined shape or formed by grinding using a file. You can also.
さらにまた、攪拌工程において、芳香剤を混合することにより、成形物に対して香り付けを行うことができる。 Furthermore, in a stirring process, a fragrance | flavor can be performed with respect to a molded object by mixing an aromatic.
加えて、攪拌工程において染色剤を混合することにより、成形物に対して色付けを行うことができる。なお、本実施形態でぺースト綿繊維塊をビニル袋に入れ、振とうすることにより攪拌しているが、公知の攪拌機を使用することもできる。攪拌機で行うときには、ペースト綿繊維塊内にフィブリル化綿繊維が概ね均一に分布するのに必要な時間を予め計測することにより、タイマーによるカウントを用いた攪拌を行ってもよい。 In addition, the molded product can be colored by mixing the dyeing agent in the stirring step. In this embodiment, the paste cotton fiber lump is put into a vinyl bag and stirred by shaking, but a known stirrer can also be used. When performing with a stirrer, you may perform stirring using the count by a timer by measuring beforehand the time required for the fibrillated cotton fiber to distribute substantially uniformly in the paste cotton fiber lump.
以下、本発明の製造方法によって製造される成形物の物理的特性について、実施例を用いて詳細に説明する。
(実施例1)Hereinafter, the physical characteristics of the molded article manufactured by the manufacturing method of the present invention will be described in detail using examples.
(Example 1)
綿繊維としてアメリカ産の綿繊維を使用した。通常の脱脂・漂白処理を行ったのち、目付け150〜180g/m2の薄綿帯を生成した。これをエンボス加工し、ペーパ状の綿を作成し、シュレッダーで一辺が3〜4mmの角形の切片を生成した。この綿繊維からなる切片をマスコロイダー(増幸産業KK製のスーパーマスコロイダー、MKZA10−15J、グラインダーMFE10−46深溝型とMKGC10−80標準型を材料の微細化の状況によって使い分けた)を用いてフィブリル化した。American cotton fibers were used as the cotton fibers. After performing normal degreasing and bleaching treatment, a thin cotton band having a basis weight of 150 to 180 g / m 2 was produced. This was embossed to make paper-like cotton, and a square section with a side of 3 to 4 mm was generated with a shredder. This section made of cotton fibers is fibrillated using a mascolloider (supermass colloider made by Masuyuki Sangyo KK, MKZA10-15J, grinder MFE10-46 deep groove type and MKGC10-80 standard type is properly used depending on the miniaturization of materials). Turned into.
フィブリル化綿繊維の平均繊維長は、マイクロスコープで撮影された画像を画像処理した後、実測により測定してその平均値を示した。 The average fiber length of the fibrillated cotton fibers was measured by actual measurement after image processing of an image taken with a microscope, and the average value was shown.
フィブリル化した綿繊維を水に混合して水懸濁液を得た後、不織布からなるフィルターでろ過して綿繊維を濃縮し、ペースト状の綿繊維集合体を得た。 The fibrillated cotton fibers were mixed with water to obtain a water suspension, and then filtered through a non-woven filter to concentrate the cotton fibers to obtain a paste-like cotton fiber aggregate.
フィブリル化したペースト状の綿繊維をビニル袋に入れて攪拌した。フィブリル化した繊維に混合される水として水道水を用いた。 The fibrillated paste-like cotton fibers were placed in a vinyl bag and stirred. Tap water was used as the water mixed with the fibrillated fibers.
乾燥機には丸一技研製の吸引式脱脂綿乾燥機を使用した。乾燥温度は50℃とし、乾燥時間は49〜61時間とした。 A suction type absorbent cotton dryer manufactured by Maruichi Giken was used as the dryer. The drying temperature was 50 ° C., and the drying time was 49 to 61 hours.
実施例の物理的特性および成形性について詳しく評価を行った。具体的には、異なる平均繊維長のフィブリル化綿繊維、および含水率で製造した固化物から、短辺が10mm、長辺が80mmと120mm、厚さが4mmのJIS規格の試験片を切り出し、種々の試験を行った。 The physical properties and moldability of the examples were evaluated in detail. Specifically, from fibrillated cotton fibers having different average fiber lengths and a solidified product produced with a moisture content, 10 mm short sides, 80 mm and 120 mm long sides, 4 mm thick JIS standard test pieces were cut out, Various tests were performed.
この試験において成形性が良好であるとの評価は、固化物内および表面に隙間がほとんどなく均一な状態にあることを示し、見かけの比重1.2g/cm3を基準として行った。見かけの比重が1.2g/cm3より小さい場合、成形物には大きな隙間が多く存在しているのに対し、見かけの比重が1.2g/cm3以上である場合には、固化した綿繊維が隙間なく結束し、隙間の存在を視認することはできなかったためである。よって、見かけの比重が1.2g/cm3以上である場合には成形性が良好であると判断し(表1においては、成形性の欄に○を付与した)、見かけの比重が1.2g/cm3未満である場合は、成形物を得ることはできるが隙間が存在するものとして成形性は不良と判断した(表1においては、成形性の欄に×を付与した)。見かけの比重は、製品の形状を斉一にし、重量と体積を測定して算出した。In this test, the evaluation that the moldability was good showed that there was almost no gap in the solidified product and on the surface, and it was in a uniform state, and the apparent specific gravity was 1.2 g / cm 3 as a reference. When the apparent specific gravity is smaller than 1.2 g / cm 3 , there are many large gaps in the molded product, whereas when the apparent specific gravity is 1.2 g / cm 3 or more, solidified cotton This is because the fibers were bound without a gap and the presence of the gap could not be visually confirmed. Therefore, when the apparent specific gravity is 1.2 g / cm 3 or more, it is judged that the moldability is good (in Table 1, ○ is given in the column of moldability), and the apparent specific gravity is 1. When it was less than 2 g / cm 3 , a molded product could be obtained, but it was judged that the moldability was poor because there was a gap (in Table 1, x was given in the column of moldability). The apparent specific gravity was calculated by measuring the weight and volume of the product in the same shape.
また、物理的特性については、宮崎県工業技術センター、鹿児島県工業技術センターで行った。 In addition, physical properties were measured at Miyazaki Prefectural Industrial Technology Center and Kagoshima Prefectural Industrial Technology Center.
試験の結果、表1、及び図3に示すように、フィブリル化綿繊維の繊維長を0.3mm以下にするとともに含水率を80〜90%とすると、見かけの比重が1.2g/cm3以上となり、成形性が良好であった。なお、含水率を90%より大きくした場合でも見かけの比重は1.2g/cm3より大きな値となるが、乾燥固化する間に繊維と水が分離して部分的に含水率のむらが生じるため、成形性は不良と判断した。As a result of the test, as shown in Table 1 and FIG. 3, when the fiber length of the fibrillated cotton fiber is 0.3 mm or less and the water content is 80 to 90%, the apparent specific gravity is 1.2 g / cm 3. Thus, the moldability was good. Even when the moisture content is greater than 90%, the apparent specific gravity is a value greater than 1.2 g / cm 3, but the fibers and water are separated during drying and solidification, resulting in uneven moisture content. The moldability was judged to be poor.
また、表1に示すように、本実施例の固化物は合成樹脂プラスチックの代替品として使用可能である十分な物理強度を備えていることが明らかとなった。さらに、見かけの比重が1.2g/cm3以上である場合、衝撃強度および曲げ強度は見かけ比重が1.2g/cm3より小さいものに比べて高い値を示した。Further, as shown in Table 1, it was revealed that the solidified product of this example had sufficient physical strength that could be used as a substitute for synthetic resin plastic. Furthermore, when the apparent specific gravity was 1.2 g / cm 3 or more, the impact strength and the bending strength were higher than those having an apparent specific gravity of less than 1.2 g / cm 3 .
Claims (6)
前記綿繊維を平均繊維長0.3mm以下となるようにフィブリル化し、
このフィブリル化綿繊維を80〜90%の含水率で水とともに攪拌し、この攪拌物を乾燥固化させて成形物を得ることを特徴とする綿繊維由来の成形物の製造方法。A method for producing a molded product derived from cotton fibers,
The cotton fibers are fibrillated to an average fiber length of 0.3 mm or less,
A method for producing a molded product derived from cotton fiber, characterized in that the fibrillated cotton fiber is stirred with water at a water content of 80 to 90%, and the stirred product is dried and solidified to obtain a molded product.
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