JP6137071B2 - Method for producing thermoplastic resin composition and method for producing pellets - Google Patents
Method for producing thermoplastic resin composition and method for producing pellets Download PDFInfo
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本発明は、熱可塑性樹脂組成物の製造方法、及びこの製造方法により製造された熱可塑性樹脂組成物より得られるペレットの製造方法に関する。
The present invention relates to a method for producing a thermoplastic resin composition and a method for producing pellets obtained from the thermoplastic resin composition produced by this production method.
従来、熱可塑性樹脂に、補強等を目的として天然繊維が混合された樹脂成形品が知られている。このような樹脂成形品は、熱可塑性樹脂と天然繊維とを含む粒状の熱可塑性樹脂組成物（ペレット）を原料とし、射出成形や押出成形することで、比較的複雑な形状のものを効率よく生産することが可能となる。ここで、効率よく熱可塑性樹脂と天然繊維とを混合してペレットを製造するためには、押出機を用いて熱可塑性樹脂と天然繊維とを混練することで、熱可塑性樹脂中に天然繊維を均一に分散させ、造粒するのが望ましい。しかしながら、従来は、天然繊維をばらばらな状態のままで押出機に供給しており、繊維の混合量が多い場合、繊維が長い場合、或いは繊維が柔らかい場合等には、繊維が押出機のスクリュに絡みやすく、また繊維がダマになりやすいため、天然繊維を均一に分散させるのが困難であった。特に、天然繊維としてコットンに代表される種子毛繊維を用いる場合、繊維が長くて柔らかいため、元来の長さのままでは、押出機を用いて熱可塑性樹脂中に均一に分散させることが困難である。また、種子毛繊維は、繊維がランダムに絡まり合ってわた状の集合体を形成しているため、そのままでは一定量を安定して連続的に押出機に供給するのも難しい。 Conventionally, a resin molded product in which natural fibers are mixed with a thermoplastic resin for the purpose of reinforcement or the like is known. Such resin molded products are made from a granular thermoplastic resin composition (pellet) containing a thermoplastic resin and natural fibers as raw materials, and can be efficiently molded into relatively complex shapes by injection molding or extrusion molding. It becomes possible to produce. Here, in order to efficiently mix the thermoplastic resin and natural fiber to produce pellets, the natural fiber is mixed in the thermoplastic resin by kneading the thermoplastic resin and natural fiber using an extruder. It is desirable to uniformly disperse and granulate. However, conventionally, natural fibers are supplied to the extruder in a dispersed state, and when the amount of fibers mixed is large, when the fibers are long, or when the fibers are soft, the fibers are not screwed into the extruder. It is difficult to uniformly disperse natural fibers because the fibers tend to get entangled and the fibers tend to become lumps. In particular, when using seed hair fibers typified by cotton as natural fibers, the fibers are long and soft, so it is difficult to uniformly disperse them in the thermoplastic resin using an extruder with the original length. It is. In addition, since the seed hair fibers form a wag-like aggregate in which the fibers are entangled at random, it is difficult to supply a constant amount to the extruder in a stable manner as it is.
一方、例えば、特許文献１には、押出機を用いずに、天然繊維を含む熱可塑性樹脂ペレットを製造する方法が提案されている。特許文献１に記載の製造方法によれば、先ず、天然繊維と熱可塑性樹脂繊維とを均一に混合して繊維混合体とする。次に、繊維混合体をくしけずって繊維の方向を揃え、撚りが加えられてない繊維束であるスライバーを形成する。次に、このスライバーを加熱して熱可塑性樹脂繊維を軟化させて天然繊維に粘着させ、熱可塑性繊維と天然繊維とを結合させる。これにより熱可塑性樹脂繊維と天然繊維との接点は結合しつつも、相互間に間隙を形成した多孔質な線状の成形体が形成される。次に、この多孔質な線状の成形体を引き延ばしながら撚り、更にローラで半径方向に圧縮して棒状に形成する。最後に、この棒状の成形体を短く切断してペレットが得られる。 On the other hand, for example, Patent Document 1 proposes a method for producing thermoplastic resin pellets containing natural fibers without using an extruder. According to the manufacturing method described in Patent Document 1, first, natural fibers and thermoplastic resin fibers are uniformly mixed to obtain a fiber mixture. Next, the fiber mixture is combed to align the direction of the fibers to form a sliver that is a fiber bundle that is not twisted. Next, the sliver is heated to soften the thermoplastic resin fiber and adhere to the natural fiber, thereby bonding the thermoplastic fiber and the natural fiber. Thereby, while the contact of the thermoplastic resin fiber and the natural fiber is bonded, a porous linear molded body in which a gap is formed between them is formed. Next, this porous linear shaped product is twisted while being stretched, and further compressed in the radial direction with a roller to form a rod shape. Finally, this rod-shaped compact is cut short to obtain pellets.
特許文献１に記載のペレットの製造方法によれば、押出機を用いないことで、押出機において生じる従来の問題を回避してペレットを製造することはできる。しかし、工程が多く、しかも専用の設備を設けなければならない。 According to the method for producing pellets described in Patent Document 1, by not using an extruder, it is possible to produce pellets while avoiding conventional problems that occur in the extruder. However, there are many processes, and special equipment must be provided.
そこで、本発明では、天然繊維が比較的柔らかく長い場合であっても、高い混合割合にて熱可塑性樹脂に天然繊維を混合することを、押出機等の混練機でもって可能とすることを課題とした。 Therefore, in the present invention, even when natural fibers are relatively soft and long, it is possible to mix natural fibers with a thermoplastic resin at a high mixing ratio using a kneader such as an extruder. It was.
本発明は、熱可塑性樹脂と天然繊維とを含む熱可塑性樹脂組成物の製造方法であって、スライバー形成工程と、加撚工程と、溶融混練工程と、をこの順で備える。前記スライバー形成工程は、熱可塑性樹脂製繊維と、前記天然繊維と、を含み、繊維方向が長手方向に揃って連続する混合スライバーを形成する工程である。前記加撚工程は、前記混合スライバーを撚って加撚繊維束を形成する工程である。前記溶融混練工程は、前記加撚繊維束を長手方向に進行させて混練機に供給し、前記混練機で前記熱可塑性樹脂製繊維を溶融しながら混練して熱可塑性樹脂中に前記天然繊維を分散させて熱可塑性樹脂組成物を得る工程である。 This invention is a manufacturing method of the thermoplastic resin composition containing a thermoplastic resin and a natural fiber, Comprising: A sliver formation process, a twist process, and a melt-kneading process are provided in this order. The sliver forming step is a step of forming a mixed sliver including a thermoplastic resin fiber and the natural fiber, the fiber direction being aligned in the longitudinal direction and continuous. The twisting step is a step of twisting the mixed sliver to form a twisted fiber bundle. In the melt-kneading step, the twisted fiber bundle is advanced in the longitudinal direction and supplied to a kneader, and the thermoplastic fiber is kneaded while melting the thermoplastic resin in the kneader to mix the natural fibers in the thermoplastic resin. This is a step of dispersing to obtain a thermoplastic resin composition.
この熱可塑性樹脂組成物の製造方法によれば、スライバー形成工程で熱可塑性樹脂製繊維と天然繊維とを含む混合スライバーを形成する。スライバーは、繊維の方向が長手方向に揃って連続する繊維束である。スライバー形成工程で得られた混合スライバーを、加撚工程撚って加撚繊維束とすることで、長手方向の強度が向上する。その後の溶融混練工程では、可撚繊維束が長手方向に進行されて混練機に供給される。可撚繊維束では天然繊維の方向が長手方向に揃っているため、長手方向に進行させて混練機に供給されることで、天然繊維が比較的柔らかく長い場合であっても絡まることなく容易に解れる。すなわち、溶融混練工程では、混練機において、スクリュ等の回転体により可撚繊維束に長手方向への引っ張り力が加わることで、繊維が回転体へ絡まったりダマになったりすることなく解れ、溶融した熱可塑性樹脂中に均一に分散する。したがって、天然繊維として、柔らかいコットン等の種子毛繊維を用いる場合でも、スクリュ押出機等の混練機を用いて天然繊維が均一に分散した熱可塑性樹脂組成物を得ることができる。 According to this method for producing a thermoplastic resin composition, a mixed sliver containing thermoplastic resin fibers and natural fibers is formed in the sliver forming step. A sliver is a fiber bundle in which the directions of fibers are aligned in the longitudinal direction. The strength in the longitudinal direction is improved by twisting the mixed sliver obtained in the sliver forming step into a twisted fiber bundle by twisting in the twisting step. In the subsequent melt-kneading step, the twistable fiber bundle is advanced in the longitudinal direction and supplied to the kneader. In twistable fiber bundles, the direction of natural fibers is aligned in the longitudinal direction, so that it can be easily advanced without being entangled even if the natural fibers are relatively soft and long by being advanced in the longitudinal direction and fed to the kneader. I can understand. That is, in the melt-kneading process, in the kneader, the tensile force in the longitudinal direction is applied to the twistable fiber bundle by a rotating body such as a screw, so that the fibers can be melted without being entangled with the rotating body or becoming lumpy. Disperse uniformly in the resulting thermoplastic resin. Therefore, even when seed hair fibers such as soft cotton are used as natural fibers, a thermoplastic resin composition in which natural fibers are uniformly dispersed can be obtained using a kneader such as a screw extruder.
上記熱可塑性樹脂組成物の製造方法により製造された熱可塑性樹脂組成物を小片に成形してペレットを得ることができる。このペレットは、熱可塑性樹脂中に天然繊維が均一に分散しているため、これを原料とすれば、射出成形等により容易に天然繊維が均一に分散した樹脂成形品を得ることができる。 The thermoplastic resin composition produced by the method for producing the thermoplastic resin composition can be molded into small pieces to obtain pellets. Since these pellets have natural fibers uniformly dispersed in the thermoplastic resin, a resin molded product in which natural fibers are easily uniformly dispersed can be obtained by using injection molding or the like.
本発明によれば、天然繊維が比較的柔らかく長い場合であっても、高い混合割合にて熱可塑性樹脂に天然繊維を混合することを、押出機等の混練機でもって可能とすることができる。 According to the present invention, even when natural fibers are relatively soft and long, it is possible to use a kneader such as an extruder to mix the natural fibers with the thermoplastic resin at a high mixing ratio. .
本発明に係る熱可塑性樹脂組成物は、熱可塑性樹脂と天然繊維とを含有する。 The thermoplastic resin composition according to the present invention contains a thermoplastic resin and natural fibers.
熱可塑性樹脂としては、ポリプロピレン、ポリエチレン、ポリ塩化ビニル、ポリスチレン、ＡＢＳ樹脂、メタクリル樹脂、ポリアミド、ポリエステル、ポリカーボネート、ポリアセタール等の熱可塑性樹脂等が挙げられる。これらの熱可塑性樹脂は、１種類のみを単独で使用してもよく、２種類以上を併用してもよい。 Examples of the thermoplastic resin include thermoplastic resins such as polypropylene, polyethylene, polyvinyl chloride, polystyrene, ABS resin, methacrylic resin, polyamide, polyester, polycarbonate, and polyacetal. These thermoplastic resins may be used alone or in combination of two or more.
天然繊維としては、コットン、カポック等の種子毛繊維、ラミー、ケナフ、リネン、ヘンプ、ジュート等の靭皮繊維、マニラ麻、サイザル麻、パイナップル等の葉脈繊維、マニラ麻、バナナ等の葉柄繊維、ココナツヤシ等の果実繊維等の植物繊維が挙げられる。これらの植物繊維は、１種類のみを使用しても、２種類以上を併用してもよい。 Natural fibers include seed hair fibers such as cotton and kapok, bast fibers such as ramie, kenaf, linen, hemp, and jute, leaf vein fibers such as manila hemp, sisal hemp, and pineapple, petiole fibers such as manila hemp and banana, coconut palm, etc. Plant fibers such as fruit fibers. These plant fibers may be used alone or in combination of two or more.
熱可塑性樹脂組成物中の天然繊維の含有量は、特に限定されないが、後述の製造方法によれば、天然繊維を比較的多く含有させることが可能である。したがって、天然繊維は、熱可塑性樹脂組成物中に２０重量％以上８０重量％を目安に含有させることができる。 Although content of the natural fiber in a thermoplastic resin composition is not specifically limited, According to the below-mentioned manufacturing method, it is possible to contain a natural fiber comparatively much. Therefore, the natural fiber can be contained in the thermoplastic resin composition in an amount of 20% by weight to 80% by weight.
本発明に係る熱可塑性樹脂組成物は、少なくとも、スライバー形成工程と、加撚工程と、溶融混練工程と、をこの順で経ることで製造される。 The thermoplastic resin composition according to the present invention is produced by performing at least a sliver forming step, a twisting step, and a melt-kneading step in this order.
〔スライバー形成工程〕
スライバー形成工程では、熱可塑性樹脂製繊維と、天然繊維と、を含む混合スライバーが形成される。熱可塑性樹脂製繊維とは、熱可塑性樹脂を主体として繊維状に成形されたものであり、熱可塑性樹脂の他に安定剤等の添加剤を含んでいてもよい。混合スライバーは、繊維の方向が長手方向に揃って連続する繊維束である。混合スライバーは、主に繊維の摩擦力によってその形状が保持されており、その構成繊維は、長手方向に容易に引き抜くことができる。混合スライバーにおける熱可塑性樹脂製繊維と天然繊維の混合割合は、目的とする熱可塑性樹脂組成物における熱可塑性樹脂と天然繊維との混合割合とされる。
[Sliver formation process]
In the sliver forming step, a mixed sliver including thermoplastic resin fibers and natural fibers is formed. The thermoplastic resin fiber is formed into a fiber shape mainly composed of a thermoplastic resin, and may contain additives such as a stabilizer in addition to the thermoplastic resin. The mixed sliver is a fiber bundle in which the directions of the fibers are aligned in the longitudinal direction. The shape of the mixed sliver is maintained mainly by the frictional force of the fibers, and the constituent fibers can be easily pulled out in the longitudinal direction. The mixing ratio of the thermoplastic resin fiber and the natural fiber in the mixing sliver is the mixing ratio of the thermoplastic resin and the natural fiber in the target thermoplastic resin composition.
スライバー形成工程では、所定の長さの熱可塑性樹脂製繊維の集合体と天然繊維の集合体とを予め均一に混合し、得られた繊維の混合物をカードやコーマ等を用いて一本一本に分繊しながら繊維の方向を揃えてスライバーを形成して混合スライバーを得ることができる。或いは、それぞれの繊維材料ごとに繊維方向を揃えて予め各繊維材料のスライバーを形成し、各繊維材料のスライバーを平行に合わせることで混合スライバーを得ることができる。 In the sliver forming process, a thermoplastic resin fiber aggregate of a predetermined length and a natural fiber aggregate are uniformly mixed in advance, and the resulting fiber mixture is made one by one using a card or a comb. The mixed sliver can be obtained by forming the sliver by aligning the directions of the fibers while splitting into two. Alternatively, a mixed sliver can be obtained by aligning the fiber direction for each fiber material and forming sliver of each fiber material in advance and aligning the sliver of each fiber material in parallel.
混合スライバーを形成するために用いられる熱可塑性樹脂製繊維の繊維長は、好ましくは１０ｍｍ以上とされる。１０ｍｍ未満では、スライバーを形成しにくいためである。天然繊維の繊維長も、好ましくは、１０ｍｍ以上とされる。１０ｍｍ未満ではスライバーを形成しにくいためである。また、天然繊維の繊維長は、好ましくは、５０ｍｍ以下とされる。天然繊維の繊維長が５０ｍｍを超えると溶融混練工程で混練機の回転体に絡まりやすくなるおそれがあるため、好ましくない。 The fiber length of the thermoplastic resin fibers used for forming the mixed sliver is preferably 10 mm or more. If it is less than 10 mm, it is difficult to form a sliver. The fiber length of the natural fiber is also preferably 10 mm or more. This is because it is difficult to form a sliver if it is less than 10 mm. The fiber length of the natural fiber is preferably 50 mm or less. If the fiber length of the natural fiber exceeds 50 mm, it is not preferable because it may be easily entangled with the rotating body of the kneader in the melt-kneading step.
〔加撚工程〕
加撚工程では、スライバー形成工程で得られた混合スライバーを撚って、加撚繊維束が形成される。混合スライバーは、撚る（捻る）ことで長手方向の強度を高めることができる。加撚工程では、混合スライバーを撚って加撚繊維束とすることで、後の溶融混練工程で加撚繊維束を長手方向に進行させて混練機に供給するにあたり、加撚繊維束の構成繊維が引き抜けないように、すなわち加撚繊維束が分断しないように長手方向の強度が高められる。しかし、ここで撚りの程度が強すぎ、例えば、糸様になるほど強く撚ると、混練機内で加撚繊維束が解れにくくなり、解れる前に混練機のスクリュ等に絡みやすくなるので好ましくない。したがって、加撚繊維束の撚りの程度は、後の溶融混練工程で加撚繊維束を長手方向に進行させて混練機に供給するに足る程度の長手方向の強度を付与し、且つ溶融混練工程で容易に撚りが解れる程度とされる。目安としては、加撚繊維束の１０ｃｍあたり、１〜３回撚る（捻る）。
[Twisting process]
In the twisting step, the mixed sliver obtained in the sliver forming step is twisted to form a twisted fiber bundle. The mixed sliver can increase the strength in the longitudinal direction by twisting (twisting). In the twisting process, the mixed sliver is twisted to form a twisted fiber bundle, so that the twisted fiber bundle is advanced in the longitudinal direction in the subsequent melt-kneading process and supplied to the kneader. The strength in the longitudinal direction is increased so that the fibers are not pulled out, that is, the twisted fiber bundle is not divided. However, the degree of twisting is too strong, for example, twisting so strongly as to be like a yarn, it is difficult to unwind the twisted fiber bundle in the kneading machine, and it is not preferable because it tends to be entangled with the screw of the kneading machine before it is unwound. . Therefore, the twisting degree of the twisted fiber bundle gives the strength in the longitudinal direction sufficient to advance the twisted fiber bundle in the longitudinal direction in the subsequent melt-kneading process and supply it to the kneader, and the melt-kneading process. It is said that the twist can be easily unwound. As a guideline, twist 1 to 3 times per 10 cm of the twisted fiber bundle.
〔溶融混練工程〕
溶融混練工程では、加撚工程で得られた加撚繊維束を混練機へ供給し、加熱しながら混練することで、熱可塑性樹脂製繊維を溶融し、熱可塑性樹脂中に天然繊維を分散させることで、熱可塑性樹脂組成物が得られる。混練機としては、単軸、二軸又は多軸混練押出機等のスクリュ押出機のような連続式の混練機が好適に用いられる。溶融混練工程では、加撚繊維束を長手方向に進行させて、混練機へ連続供給する。加撚繊維束を長手方向に進行させる手段は限定されない。例えば、混練機のスクリュの回転力により加撚繊維束を混練機内へ引き込んでもよいし、混練機の外側から内部へ向けて加撚繊維束を繰り出すことで、混練機内へ送り込んでもよい。または、これらの手段を組み合わせることにより、加撚繊維束を長手方向に進行させて混練機に供給してもよい。
[Melting and kneading process]
In the melt-kneading step, the twisted fiber bundle obtained in the twisting step is supplied to a kneader and kneaded while heating to melt the thermoplastic resin fibers and disperse the natural fibers in the thermoplastic resin. Thereby, a thermoplastic resin composition is obtained. As the kneading machine, a continuous kneading machine such as a screw extruder such as a single-screw, twin-screw or multi-screw kneading extruder is preferably used. In the melt-kneading step, the twisted fiber bundle is advanced in the longitudinal direction and continuously supplied to the kneader. The means for advancing the twisted fiber bundle in the longitudinal direction is not limited. For example, the twisted fiber bundle may be drawn into the kneader by the rotational force of the screw of the kneader, or may be fed into the kneader by feeding the twisted fiber bundle from the outside to the inside of the kneader. Alternatively, by combining these means, the twisted fiber bundle may be advanced in the longitudinal direction and supplied to the kneader.
溶融混練工程では、混練機に供給された加撚繊維束が、スクリュの回転によって長手方向に引っ張られることで、加撚繊維束から容易に繊維が引き抜かれて分散する。そして、熱可塑性樹脂製繊維が溶融されて混練されることで、熱可塑性樹脂中に天然繊維が分散した熱可塑性樹脂組成物を得ることができる。溶融混練工程では、加撚繊維束が混練機のスクリュを収容した加熱筒（シリンダ）に供給されると、スクリュの回転により長手方向への引っ張り力を加えられながら加熱筒の先方へ推進される。加撚繊維束は、長手方向への引っ張り力が加えられることで繊維が引き抜かれ、繊維が長くても絡むことなく、容易にばらばらになる。そして、ばらばらになった天然繊維が溶融した熱可塑性樹脂中に均一に分散する。 In the melt-kneading step, the twisted fiber bundle supplied to the kneader is pulled in the longitudinal direction by the rotation of the screw, so that the fiber is easily pulled out and dispersed from the twisted fiber bundle. And a thermoplastic resin composition in which natural fibers are dispersed in a thermoplastic resin can be obtained by melting and kneading the thermoplastic resin fibers. In the melt-kneading step, when the twisted fiber bundle is supplied to a heating cylinder (cylinder) containing the screw of the kneading machine, it is propelled toward the end of the heating cylinder while applying a tensile force in the longitudinal direction by the rotation of the screw. . The twisted fiber bundle is pulled out by applying a tensile force in the longitudinal direction, and is easily separated without being entangled even if the fiber is long. Then, the separated natural fibers are uniformly dispersed in the molten thermoplastic resin.
この熱可塑性樹脂組成物の製造方法によれば、混練機に供給される材料の形態が、加撚繊維束と称される熱可塑性樹脂製繊維と天然繊維とからなる繊維束の形態とされており、繊維の方向が揃えられた状態で混練機に供給される。そして、その繊維束が長手方向に進行されて混練機に供給されながらスクリュで混練されるため、繊維はスクリュの回転により長手方向に引っ張られることで容易に解れて分散する。そのため、たとえば、コットンのように柔らかい天然繊維を比較的長いまま用いた場合でも、スクリュに絡んだり、ダマになったりするのを抑制して分散させることができる。したがって、天然繊維を、溶融した熱可塑性樹脂中に、均一に、且つ高い混合割合で混ぜ込むことができる。 According to this method for producing a thermoplastic resin composition, the material supplied to the kneader is in the form of a fiber bundle composed of thermoplastic resin fibers called natural twisted fiber bundles and natural fibers. And fed to the kneader in a state where the directions of the fibers are aligned. And since the fiber bundle is advanced in the longitudinal direction and is kneaded by the screw while being supplied to the kneader, the fiber is easily unwound and dispersed by being pulled in the longitudinal direction by the rotation of the screw. Therefore, for example, even when a soft natural fiber such as cotton is used for a relatively long time, it can be dispersed while being entangled with a screw or being damped. Therefore, natural fibers can be mixed uniformly and at a high mixing ratio in the molten thermoplastic resin.
得られた熱可塑性樹脂組成物は、射出成形や押出成形等により種々の形状に成形することができる。熱可塑性樹脂組成物に、天然繊維を比較的長いまま高い含有率で含有させることで、例えば、高強度、高剛性、高体衝撃性の熱可塑性樹脂成形品を得ることが可能である。ここで、最終的な熱可塑性樹脂成形品を得るにあたり、熱可塑性樹脂組成物を小片に成形してペレットとし、これを原料として成形することで、天然繊維が均一に分散した成形品を容易に得ることができる。ペレットは、上記溶融混練工程の後に、熱可塑性樹脂組成物を小片に成形してペレットを得るペレット化工程を経ることで製造することができる。ペレットの製造は、溶融混練工程で用いられる押出機により、溶融混練工程とペレット化工程とを連続して行うことができる。 The obtained thermoplastic resin composition can be molded into various shapes by injection molding, extrusion molding or the like. For example, a thermoplastic resin molded article having high strength, high rigidity, and high body impact can be obtained by allowing the thermoplastic resin composition to contain natural fibers at a relatively high content rate. Here, in obtaining a final thermoplastic resin molded product, the thermoplastic resin composition is molded into small pieces to form pellets, and this is used as a raw material to easily form a molded product in which natural fibers are uniformly dispersed. Can be obtained. The pellet can be produced by performing a pelletization step of forming a pellet by molding the thermoplastic resin composition into small pieces after the melt-kneading step. Manufacture of a pellet can perform a melt-kneading process and a pelletization process continuously with the extruder used by a melt-kneading process.
天然繊維としてコットン繊維、熱可塑性樹脂としてポリプロピレンを用い、天然繊維を５０重量％含む熱可塑性樹脂組成物を次の通り製造した。先ず、繊維長３０ｍｍのコットン繊維と、繊維長４０ｍｍのポリプロピレン製繊維（ＰＰ繊維）を、天然繊維が５０重量％となるように混合し、繊維方向を揃えて、天然繊維とＰＰ繊維とが均一に混合された混合スライバーを形成した。次に、その混合スライバーを１０ｃｍあたり２回捻って撚りをかけ、加撚繊維束を形成して巻き取った。次に、その加撚繊維束を二軸混練押出機の投入口に送り込み、２００℃の温度で溶融混練し、混練物を３ｍｍφの形状で押出し、裁断することで、ポリプロピレンにコットン繊維が均一に分散した熱可塑性樹脂組成物からなるペレットを得た。
Using a cotton fiber as a natural fiber and polypropylene as a thermoplastic resin, a thermoplastic resin composition containing 50% by weight of the natural fiber was produced as follows. First, a cotton fiber having a fiber length of 30 mm and a polypropylene fiber (PP fiber) having a fiber length of 40 mm are mixed so that the natural fiber is 50% by weight, and the fiber direction is aligned so that the natural fiber and the PP fiber are uniform. To form a mixed sliver. Next, the mixed sliver was twisted twice per 10 cm to form a twisted fiber bundle and wound up. Next, the twisted fiber bundle is fed into the inlet of a twin-screw kneading extruder, melt-kneaded at a temperature of 200 ° C., and the kneaded product is extruded in a shape of 3 mmφ, and the cotton fibers are uniformly formed on the polypropylene. Pellets made of the dispersed thermoplastic resin composition were obtained.
Claims (3)
スライバー形成工程と、加撚工程と、溶融混練工程と、をこの順で備え、
前記スライバー形成工程は、熱可塑性樹脂製繊維と、前記天然繊維と、を含み、繊維方向が長手方向に揃って連続する混合スライバーを形成する工程であり、
前記加撚工程は、前記混合スライバーを撚って加撚繊維束を形成する工程であり、
前記溶融混練工程は、前記加撚繊維束を長手方向に進行させて混練機に供給し、前記混練機で前記熱可塑性樹脂製繊維を溶融しながら混練して熱可塑性樹脂中に前記天然繊維を分散させて熱可塑性樹脂組成物を得る工程である、熱可塑性樹脂組成物の製造方法。 A method for producing a thermoplastic resin composition comprising a thermoplastic resin and natural fibers,
A sliver forming step, a twisting step, and a melt-kneading step are provided in this order,
The sliver forming step is a step of forming a mixed sliver including a thermoplastic resin fiber and the natural fiber, the fiber direction being aligned in the longitudinal direction and continuous.
The twisting step is a step of twisting the mixed sliver to form a twisted fiber bundle,
In the melt-kneading step, the twisted fiber bundle is advanced in the longitudinal direction and supplied to a kneader, and the thermoplastic fiber is kneaded while melting the thermoplastic resin in the kneader to mix the natural fibers in the thermoplastic resin. A method for producing a thermoplastic resin composition, which is a step of obtaining a thermoplastic resin composition by dispersing.
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