JP4910506B2 - Manufacturing method of long fiber reinforced resin molding - Google Patents
Manufacturing method of long fiber reinforced resin molding Download PDFInfo
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Description
本発明は、長繊維強化樹脂成形体の製造方法に関する。 The present invention relates to a method for producing a long fiber reinforced resin molded product.
従来、金属やエンジニアリングプラスチックの代替材料として、長繊維強化樹脂が知られている。このような長繊維強化樹脂を用いた成形体は、剛性や耐熱性、強度に優れるため、自動車部品等に使用されている。しかしながら、かかる長繊維強化樹脂を用いた成形体に含まれる強化繊維は、開繊性が不十分なことが多く、未開繊の部分、即ち、開繊せず固まりとなった部分が成形体の外観を悪化してしまうことがあった。開繊性を向上させる方法として、特許文献１には、特定の形状の長繊維強化樹脂ペレットを用いる方法が記載されている。 Conventionally, long fiber reinforced resin is known as an alternative material for metals and engineering plastics. A molded body using such a long fiber reinforced resin is excellent in rigidity, heat resistance, and strength, and thus is used in automobile parts and the like. However, the reinforcing fibers contained in the molded body using such a long fiber reinforced resin often have insufficient opening properties, and the unopened part, that is, the part that has not been opened and has become solid is the part of the molded body. The appearance may be deteriorated. As a method for improving the spreadability, Patent Document 1 describes a method using long fiber reinforced resin pellets having a specific shape.
しかしながら前記のペレットを用いた場合には、開繊性は改良されるものの、得られる成形体中の強化繊維の長さが材料として用いる強化繊維に比べて短くなり、得られる成形体の物性が低下することがあった。 However, when the above pellets are used, the spreadability is improved, but the length of the reinforcing fiber in the resulting molded body is shorter than the reinforcing fiber used as a material, and the physical properties of the resulting molded body are reduced. There was a decline.
一方、材料として用いる強化繊維の長さを損なわずに該強化繊維を成形体中に含有させる方法としては、ペレットにせん断応力がかからないように、ゲートを広げたり、スクリューの長さ（Ｌ）と直径（Ｄ）との比（Ｌ／Ｄ）やスクリューの溝深さを調整したり、背圧をかけずに射出成形したりする方法等が知られている。しかしながらこれらの方法では、繊維が開繊し難くなり、得られる成形体の外観が悪化することがあった。 On the other hand, as a method of incorporating the reinforcing fiber into the molded product without impairing the length of the reinforcing fiber used as a material, the gate is widened or the length of the screw (L) There are known methods for adjusting the ratio (L / D) to the diameter (D), the groove depth of the screw, and injection molding without applying back pressure. However, in these methods, the fibers are difficult to open and the appearance of the resulting molded product may be deteriorated.
このように、材料として用いる強化繊維の長さを損なわずに該強化繊維を成形体中に含有させることと、成形体中に含まれる強化繊維の開繊性を向上させることは相反しており、これらを同時に満たすことは、現状では非常に困難である。 As described above, it is contrary to including the reinforcing fiber in the molded body without impairing the length of the reinforcing fiber used as a material and improving the opening property of the reinforcing fiber contained in the molded body. It is very difficult to satisfy these requirements at the same time.
本発明は、上記事情に鑑みなされたもので、材料として用いる強化繊維の長さを損なわずに含有し、かつ強化繊維の開繊性が良好な長繊維強化樹脂成形体の製造方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and provides a method for producing a long-fiber reinforced resin molded article that is contained without impairing the length of a reinforcing fiber used as a material and that has a good fiber-opening property. For the purpose.
すなわち本発明は、長繊維がガラス繊維であり、熱可塑性樹脂がポリプロピレン樹脂である長繊維含有熱可塑性樹脂を射出成形機にて可塑化した長繊維含有溶融状熱可塑性樹脂を、前記射出成形機中のスクリューを回転させながら、計量ストロークが前記射出成形機の最大射出ストロークの５０％以上となるように計量した後、一対の金型キャビティ内に注入し、固化して長繊維強化樹脂成形体を製造する方法であって、前記計量時のスクリュー背圧を計量開始位置から計量完了位置までの任意の場所で切換え、前記計量開始位置から前記切換え場所までのスクリュー背圧（Ｐ１）がゼロｋｇ／ｃｍ 2 であり、前記計量開始位置から前記切換え場所までのスクリュー背圧（Ｐ１）より、前記切換え場所から前記計量完了位置までのスクリュー背圧（Ｐ２）が１００ｋｇ／ｃｍ 2 以上高いことを特徴とする長繊維強化樹脂成形体の製造方法である。 That is, the present invention relates to a long-fiber-containing molten thermoplastic resin obtained by plasticizing a long-fiber-containing thermoplastic resin, in which the long-fiber is a glass fiber and the thermoplastic resin is a polypropylene resin, with the injection-molding machine. While measuring the screw so that the measuring stroke is 50% or more of the maximum injection stroke of the injection molding machine while rotating the screw inside, it is injected into a pair of mold cavities and solidified to be a long fiber reinforced resin molded product The screw back pressure at the time of weighing is switched at an arbitrary position from the measurement start position to the measurement completion position, and the screw back pressure (P1) from the measurement start position to the switching position is zero kg. / cm 2, a screw of the more screw back pressure from the measurement start position to the switching location (P1), from the switching area until the metering completion position Pressure (P2) is a method for producing a long fiber-reinforced resin molded body characterized by high 100 kg / cm 2 or more.
本発明の方法によれば、材料として用いる強化繊維の長さを損なわずに含有し、かつ強化繊維の開繊性が良好な長繊維強化樹脂成形体を得ることができる。 According to the method of the present invention, it is possible to obtain a long fiber reinforced resin molded article which is contained without impairing the length of the reinforcing fiber used as a material and has a good fiber opening property.
本発明では長繊維含有熱可塑性樹脂を用いる。熱可塑性樹脂としては、ポリオレフィン系樹脂、ポリアミド系樹脂、またはポリエステル系樹脂、あるいはこれらの２種類以上の樹脂の混合物が好ましい。 In the present invention, a long fiber-containing thermoplastic resin is used. The thermoplastic resin is preferably a polyolefin resin, a polyamide resin, a polyester resin, or a mixture of two or more of these resins.
前記ポリオレフィン系樹脂としては、例えば、プロピレン単独重合体、プロピレン-エチレンブロック共重合体、プロピレン-エチレンランダム共重合体等のポリプロピレン系樹脂；高密度ポリエチレン等のポリエチレン系樹脂；ポリ（１-ブテン）系樹脂；ポリ（３-メチル−１−ブテン）系樹脂；ポリ（４-メチル−１−ペンテン）系樹脂；またはこれらの混合物等を採用できる。
前記ポリアミド系樹脂としては、ポリアミド−６、ポリアミド−１１、ポリアミド−１２、ポリアミド−４，６、ポリアミド−６，６、ポリアミド−，１０、ポリアミド−６，１２、またはこれらのアロイ化樹脂等を採用できる。
前記ポリエステル系樹脂としては、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリカーボネート、ポリエステルカーボネート、またはこれらのアロイ化樹脂等を採用できる。
Examples of the polyolefin resin include polypropylene resins such as propylene homopolymer, propylene-ethylene block copolymer, propylene-ethylene random copolymer; polyethylene resins such as high-density polyethylene; poly (1-butene) Poly (3-methyl-1-butene) resin; poly (4-methyl-1-pentene) resin; or a mixture thereof can be employed.
Examples of the polyamide-based resins include polyamide-6, polyamide-11, polyamide-12, polyamide-4,6, polyamide-6,6, polyamide-6, 10, polyamide-6,12, and alloyed resins thereof. Can be adopted.
As the polyester resin, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyester carbonate, or an alloyed resin thereof can be used.
このような熱可塑性樹脂のうち、ポリオレフィン系樹脂を用いることが好ましい。ポリオレフィン系樹脂としては非晶性または結晶性のポリオレフィン系樹脂を用いることが出来るが、好ましくは結晶性のポリオレフィン系樹脂である。
中でもポリプロピレン系樹脂が好ましく、さらにはポリプロピレン単独重合体、プロピレンとエチレンおよび／または炭素原子数４〜１０のα−オレフィンとのブロック共重合体もしくはランダム共重合体、またはこれらの混合物が好ましい。ポリプロピレン系樹脂には、不飽和カルボン酸またはその誘導体で変性された不飽和カルボン酸類変性ポリオレフィン(典型的には無水マレイン酸変性ポリプロピレン)を含有させて用いると、長繊維と熱可塑性樹脂との接着性を向上でき、さらなる優れた強度を確保できる点で好ましい。なお、不飽和カルボン酸類変性ポリオレフィンの含有量は、０．０１〜５０重量％が好ましい。
Among such thermoplastic resins, it is preferable to use a polyolefin resin. As the polyolefin resin, an amorphous or crystalline polyolefin resin can be used, and a crystalline polyolefin resin is preferable.
Among these, a polypropylene resin is preferable, and a polypropylene homopolymer, a block copolymer or a random copolymer of propylene and ethylene and / or an α-olefin having 4 to 10 carbon atoms, or a mixture thereof is preferable. When the polypropylene resin contains an unsaturated carboxylic acid-modified polyolefin (typically maleic anhydride-modified polypropylene) modified with an unsaturated carboxylic acid or a derivative thereof, adhesion between the long fiber and the thermoplastic resin can be achieved. It is preferable at the point which can improve property and can ensure the further outstanding intensity | strength. In addition, as for content of unsaturated carboxylic acid modified polyolefin, 0.01 to 50 weight% is preferable.
また、本発明で用いられる熱可塑性樹脂には、必要に応じて各種添加剤や充填剤、例えば酸化防止剤、帯電防止剤、造核剤、紫外線吸収剤、顔料などを含ませることができる。 Further, the thermoplastic resin used in the present invention may contain various additives and fillers, for example, an antioxidant, an antistatic agent, a nucleating agent, an ultraviolet absorber, and a pigment as necessary.
本発明で用いられる長繊維含有熱可塑性樹脂は、長繊維を１０〜６０重量％含有することが好ましく、１５〜５０重量％含有することがより好ましく、２０〜４５重量％含有することがさらに好ましい。長繊維の含有率を前記範囲とすることにより、高温時の強度、剛性または耐久性に優れ、かつ、成形性が良好であるため、得られる成形体の外観も良好となる。また成形体の軽量化も達成し得る。 The long fiber-containing thermoplastic resin used in the present invention preferably contains 10 to 60% by weight of long fibers, more preferably 15 to 50% by weight, and even more preferably 20 to 45% by weight. . By setting the long fiber content in the above range, the strength, rigidity or durability at high temperatures is excellent, and the moldability is good, so the appearance of the resulting molded article is also good. Moreover, weight reduction of a molded object can also be achieved.
本発明で用いられる長繊維含有熱可塑性樹脂における長繊維とは、２ｍｍ以上の長さの繊維である。本発明における長繊維含有熱可塑性樹脂とは、長繊維と熱可塑性樹脂とを混合した混合物であってもよいが、以下のような方法により得られる、長繊維を熱可塑性樹脂にて被覆した長繊維強化樹脂であることが好ましい。すなわち、長い強化繊維の束を引き抜きながら溶融した熱可塑性樹脂をそれに含侵させたのち冷却し、２ｍｍ以上の長さに切断することによりペレットとして得られる長繊維強化樹脂である。該ペレットの長さは通常５０ｍｍ以下である。本発明で用いる長繊維強化樹脂は、該樹脂に含まれる強化繊維長と実質的に等しい長さのペレット長を有することが好ましい。 The long fiber in the long fiber-containing thermoplastic resin used in the present invention is a fiber having a length of 2 mm or more. The long fiber-containing thermoplastic resin in the present invention may be a mixture in which long fibers and a thermoplastic resin are mixed, but is obtained by the following method and is obtained by coating the long fibers with a thermoplastic resin. A fiber reinforced resin is preferred. That is, it is a long fiber reinforced resin obtained as pellets by impregnating a molten thermoplastic resin while drawing a bundle of long reinforcing fibers, impregnating it, cooling it, and cutting it to a length of 2 mm or more. The length of the pellet is usually 50 mm or less. The long fiber reinforced resin used in the present invention preferably has a pellet length that is substantially equal to the length of the reinforcing fiber contained in the resin.
長繊維としてはガラス繊維が好ましく用いられ、Ｅガラス（Electrical glass）、Ｃガラス（Chemical glass）、Ａガラス（Alkali glass）、Ｓガラス（High strength glass）および耐アルカリガラス等のガラスを溶融紡糸して得られるガラスフィラメントの束をコイル状に巻き取ったいわゆるガラスロービングの形態のものを、バー、ロール、ダイス等で開繊させながら、加熱溶融した熱可塑性樹脂中を通過させてガラスロービングに熱可塑性樹脂を含侵させ、冷却して熱可塑性樹脂を固化させたのち、２〜５０ｍｍの長さに切断して得られる、ガラス繊維長とペレット長とが実質的に等しい長さであるガラス長繊維強化樹脂がさらに好ましい。
該ガラス長繊維強化樹脂のガラス繊維長（ペレット長）としてより好ましくは３〜２０ｍｍであり、さらに好ましくは６〜１５ｍｍである。
Glass fiber is preferably used as the long fiber, and glass such as E glass (Electrical glass), C glass (Chemical glass), A glass (Alkali glass), S glass (High strength glass) and alkali-resistant glass is melt-spun. The glass filament bundle obtained by winding the bundle of glass filaments in a coil shape is passed through a heat-melted thermoplastic resin while being opened with a bar, roll, die, etc. Glass length in which the glass fiber length and the pellet length are substantially equal to each other, obtained by impregnating the plastic resin, cooling and solidifying the thermoplastic resin, and then cutting to a length of 2 to 50 mm A fiber reinforced resin is more preferable.
More preferably, it is 3-20 mm as glass fiber length (pellet length) of this glass long fiber reinforced resin, More preferably, it is 6-15 mm.
ここで用いられるガラスフィラメントの繊維径は３〜４０μｍが好ましい。このような繊維径のガラスフィラメントを用いることにより、ガラス繊維の重量と数量のバランスが良好であるため樹脂を含浸させやすく、かつ、得られる成形体の表面外観が良好となる。該繊維径としてさらに好ましくは８〜２０μｍである。
該ガラスロービングはかかるガラスフィラメント１０００〜１００００本からなることが好ましく、２０００〜６０００本からなることがさらに好ましい。
ガラスフィラメントはカップリング剤を含む表面処理されていることが好ましい。該カップリング剤としては、アミノシラン、エポキシシラン、アミドシラン、アジドシラン、アクリルシランのようなシランカップリング剤、チタネート系カップリング剤、およびこれらの混合物が利用される。これらのうち、アミノシランまたはエポキシシランが好ましく、アミノシランがさらに好ましい。
As for the fiber diameter of the glass filament used here, 3-40 micrometers is preferable. By using a glass filament having such a fiber diameter, the balance between the weight and the quantity of the glass fiber is good, so that the resin can be easily impregnated, and the surface appearance of the obtained molded article becomes good. The fiber diameter is more preferably 8 to 20 μm.
The glass roving is preferably composed of 1000 to 10,000 glass filaments, more preferably 2000 to 6000.
The glass filament is preferably surface-treated containing a coupling agent. As the coupling agent, silane coupling agents such as amino silane, epoxy silane, amide silane, azido silane, and acrylic silane, titanate coupling agents, and mixtures thereof are used. Of these, aminosilane or epoxysilane is preferred, and aminosilane is more preferred.
前記した長繊維強化樹脂は、該長繊維強化樹脂に含まれる熱可塑性樹脂と同種の熱可塑性樹脂とをブレンドして用いてもよい。ブレンドする比率は特に限定されるものではなく、得られる長繊維強化樹脂成形体中の長繊維含有量が所望の値となるようにすればよい。 The long fiber reinforced resin described above may be used by blending a thermoplastic resin contained in the long fiber reinforced resin and the same kind of thermoplastic resin. The blend ratio is not particularly limited, and the long fiber content in the obtained long fiber reinforced resin molded article may be set to a desired value.
本発明では、前記した長繊維含有熱可塑性樹脂を用いて、射出成形を行う。本発明においては、公知のインラインスクリュー式射出成形装置を用いることができる。射出成形装置は油圧式でも電動式でもよい。成形機に投入された長繊維含有熱可塑性樹脂は、成形機内で樹脂部分が溶融して可塑化される。可塑化された長繊維含有溶融状熱可塑性樹脂は、スクリュー回転により成形機前方に送られる。この長繊維含有溶融状強化樹脂の反力によりスクリューが回転しながら後退し、後退ストロークにより前記長繊維含有溶融状強化樹脂の計量値が決定される。この後退ストロークが計量ストロークとなるが、本発明では該計量ストロークが使用する射出成形機の最大射出ストロークの５０％以上となるようにする。スクリュー回転を停止して計量を完了し、その状態でスクリューを前進させて長繊維含有溶融状熱可塑性樹脂を一対の金型キャビティ内に注入、固化した後、型を開き長繊維強化樹脂成形体を得る。スクリューを後退させて長繊維含有溶融状熱可塑性樹脂を可塑化計量する際には背圧が発生する。本発明では、長繊維含有溶融状熱可塑性樹脂の計量を行う間のスクリュー背圧を、計量開始位置から計量完了位置までの任意の場所で切換える。
具体的には、前記計量開始位置から前記切換え場所までのスクリュー背圧（Ｐ１：単位はｋｇ／ｃｍ2）より、前記切換え場所から計量完了位置までのスクリュー背圧（Ｐ２：単位はｋｇ／ｃｍ2）が高くなるようにスクリュー背圧を切換える。このような条件で射出成形して長繊維強化樹脂成形体を製造することにより、材料として用いる強化繊維の長さを損なわずに含有し、かつ強化繊維の開繊性が良好な長繊維強化樹脂成形体を得ることができる。前記計量開始位置から前記切換え場所までのスクリュー背圧（Ｐ１）はゼロｋｇ／ｃｍ 2 であることが好ましい。また前記切換え場所から計量完了位置までのスクリュー背圧（Ｐ２）は、前記計量開始位置から前記切換え場所までのスクリュー背圧（Ｐ１）より１００ｋｇ／ｃｍ 2 以上高いことがより好ましい。計量開始位置からスクリュー背圧切換え場所までのストローク（Ｌ１：単位はｍｍ）とスクリュー径（Ｄ：単位はｍｍ）との比（Ｌ１／Ｄ）は、２〜３であることが好ましい。なお成形温度は、使用する樹脂に応じて適宜設定することができる。
In the present invention, injection molding is performed using the above-described long fiber-containing thermoplastic resin. In the present invention, a known in-line screw injection molding apparatus can be used. The injection molding apparatus may be hydraulic or electric. The long fiber-containing thermoplastic resin charged in the molding machine is plasticized by melting the resin portion in the molding machine. The plasticized long fiber-containing molten thermoplastic resin is sent to the front of the molding machine by screw rotation. The screw retreats while rotating by the reaction force of the long fiber-containing molten reinforcing resin, and the measured value of the long fiber-containing molten reinforcing resin is determined by the reverse stroke. The reverse stroke is a metering stroke. In the present invention, the metering stroke is set to be 50% or more of the maximum injection stroke of the injection molding machine used. Stop the screw rotation and complete the metering, and in that state, advance the screw to inject and solidify the molten thermoplastic resin containing long fibers into a pair of mold cavities, then open the mold and mold the long fiber reinforced resin Get. When the screw is moved backward to plasticize and measure the molten thermoplastic resin containing long fibers, a back pressure is generated. In the present invention, the screw back pressure during the measurement of the long fiber-containing molten thermoplastic resin is switched at an arbitrary position from the measurement start position to the measurement completion position.
Specifically, from the screw back pressure from the measurement start position to the switching location (P1: unit is kg / cm 2 ), the screw back pressure from the switching location to the measurement completion position (P2: unit is kg / cm 2). 2 ) Change the screw back pressure so that becomes higher. By producing a long fiber reinforced resin molded article by injection molding under such conditions, the long fiber reinforced resin is contained without losing the length of the reinforced fiber used as a material, and the reinforcing fiber has a good fiber opening property. A molded body can be obtained. The screw back pressure (P1) from the measurement start position to the switching place is preferably zero kg / cm 2 . The screw back pressure (P2) from the switching location to the measurement completion position is more preferably 100 kg / cm 2 or more higher than the screw back pressure (P1) from the measurement start location to the switching location. The ratio (L1 / D) of the stroke from the measurement start position to the screw back pressure switching location (L1: unit is mm) and the screw diameter (D: unit is mm) is preferably 2 to 3. The molding temperature can be appropriately set according to the resin used.
以下実施例により説明するが、本発明はこれに制限されるものではない。
材料：ガラス長繊維強化ポリプロピレン（互いに平行に配列されたガラス繊維を含有するプロピレン単独重合体のペレット（住友化学（株）製スミストラン、ガラス繊維含有率４０％、ペレット長９ｍｍ、ガラス繊維長９ｍｍ）：１００重量部、顔料マスターバッチ（住化カラー（株）製（ブラックＳＰＰＭ−８６５）：１重量部をペレットブレンドし、以下の条件で射出成形を行い、成形体を得た。
Examples will be described below, but the present invention is not limited thereto.
Material: Glass long fiber reinforced polypropylene (Propylene homopolymer pellets containing glass fibers arranged in parallel to each other (Sumitran, manufactured by Sumitomo Chemical Co., Ltd., glass fiber content 40%, pellet length 9 mm, glass fiber length 9 mm) ): 100 parts by weight, pigment master batch (manufactured by Sumika Color Co., Ltd. (black SPPM-865): 1 part by weight was pellet-blended, and injection molding was performed under the following conditions to obtain a molded body.
成形機：ＵＢＥＭＡＸ ＵＵ３５００−４７０（宇部興産株式会社製）
スクリュー：フルフライトスクリュー（スクリュー径：１４０ｍｍ）
最大射出ストローク：８４０ｍｍ
成形温度：２８０℃
金型：該成形機での充填に要する計量ストローク＝４６０ｍｍ（最大射出ストロークの５５％）。得られる成形体形状を図１に示す。
金型温度：６０℃
残存繊維長：特開２００２−５９２４の実施例１に記載した方法で、残存繊維長を求めた。具体的には、図１に示す成形体の破線部（４０ｍｍ×４０ｍｍ）約５ｇを切出し、５５０℃電気炉で１時間３０分加熱し灰化させた。灰化物を５リットルの水で均一に分散させた状態で０．５リットルを採取し、これに４．５リットルの水を加え５リットルの希釈液体とした。この希釈液体中にガラス繊維を均一に分散した状態で１０ミリリットルを採取しろ紙によりろ過し、ろ紙が半透明の状態でろ紙上のガラス繊維全数の繊維長を画像処理装置（ニレコ社製「ルーゼックスFS」）を用いて測定し、以下の式により重量平均繊維長を求めた。
重量平均繊維長（Ｌｗ）＝（Σｑｉ×Ｌｉ2）／（Σｑｉ×Ｌｉ）
Ｌｉ：繊維長（ｍｍ）
ｑｉ：繊維長Ｌｉの繊維の本数
未開繊個数：上記成形体の、ゲートのある金型側全面におけるガラス繊維の未開繊個数を、目視にて数えた。
Molding machine: UBEMAX UU3500-470 (manufactured by Ube Industries)
Screw: Full flight screw (screw diameter: 140mm)
Maximum injection stroke: 840mm
Molding temperature: 280 ° C
Mold: Metering stroke required for filling with the molding machine = 460 mm (55% of the maximum injection stroke). The resulting molded body shape is shown in FIG.
Mold temperature: 60 ℃
Residual fiber length: The residual fiber length was determined by the method described in Example 1 of JP-A-2002-5924. Specifically, about 5 g of the broken line portion (40 mm × 40 mm) of the molded body shown in FIG. 1 was cut out and heated in a 550 ° C. electric furnace for 1 hour 30 minutes to be incinerated. In a state where the ashed product was uniformly dispersed in 5 liters of water, 0.5 liters were collected, and 4.5 liters of water was added thereto to form a 5 liter diluted liquid. Ten milliliters are collected with the glass fibers uniformly dispersed in this diluted liquid and filtered through a filter paper. The filter paper is translucent, and the total length of the glass fibers on the filter paper is measured with an image processing device ("Luzex manufactured by Nireco Corporation"). FS "), and the weight average fiber length was determined by the following formula.
Weight average fiber length (Lw) = (Σqi × Li 2 ) / (Σqi × Li)
Li: Fiber length (mm)
qi: Number of fibers having a fiber length Li Number of unopened fibers: The number of unopened glass fibers on the entire mold-side surface of the molded body was counted visually.
[実施例１]
上記成形機を用い、成形温度が２８０℃になるようにバレル温度を設定し、該樹脂をホッパーに投入後、スクリュー回転数９０ｒｐｍで計量開始位置から切換え場所（計量開始位置から３５０ｍｍの地点）まではスクリュー背圧ゼロ、すなわちスクリュー背圧をかけないで可塑化計量を行い、切換え場所から計量完了位置（計量開始位置から４６０ｍｍ）までをスクリュー回転数９０ｒｐｍ、スクリュー背圧１７０ｋｇ／ｃｍ2で可塑化計量した長繊維含有溶融状熱可塑性樹脂を金型内に射出した。得られた長繊維強化樹脂成形体における残存繊維長は２．０ｍｍであり、該成形体表面の未開繊個数は０個であった。結果を表１に示した。
[Example 1]
Using the above molding machine, set the barrel temperature so that the molding temperature becomes 280 ° C, and after charging the resin into the hopper, from the measurement start position to the switching position (350 mm from the measurement start position) at a screw rotation speed of 90 rpm Measures plasticization without screw back pressure, that is, without applying screw back pressure, and plasticizes from the switching position to the measurement completion position (460 mm from the measurement start position) at a screw rotation speed of 90 rpm and a screw back pressure of 170 kg / cm 2 . The weighed long fiber-containing molten thermoplastic resin was injected into the mold. The remaining fiber length in the obtained long fiber reinforced resin molded product was 2.0 mm, and the number of unopened fibers on the surface of the molded product was 0. The results are shown in Table 1.
[比較例１]
計量開始位置から計量完了位置までスクリュー背圧をかけないで可塑化計量した以外は、実施例１と同様に射出成形した。得られた長繊維強化樹脂成形体における残存繊維長は２．１ｍｍであり、該成形体表面の未開繊個数は４０個であった。結果を表１に示した。
[Comparative Example 1]
The injection molding was carried out in the same manner as in Example 1 except that plasticization measurement was performed without applying screw back pressure from the measurement start position to the measurement completion position. The remaining fiber length in the obtained long fiber reinforced resin molded product was 2.1 mm, and the number of unopened fibers on the surface of the molded product was 40. The results are shown in Table 1.
[比較例２]
計量開始位置から計量完了位置までスクリュー背圧１７０ｋｇ／ｃｍ2で可塑化計量した以外は、実施例１と同様に射出成形した。得られた長繊維強化樹脂成形体における残存繊維長は１．１ｍｍであり、該成形体表面の未開繊個数は０個であった。結果を表１に示した。
[Comparative Example 2]
The injection molding was carried out in the same manner as in Example 1 except that the plasticization measurement was performed at a screw back pressure of 170 kg / cm 2 from the measurement start position to the measurement completion position. The remaining fiber length in the obtained long fiber reinforced resin molded product was 1.1 mm, and the number of unopened fibers on the surface of the molded product was 0. The results are shown in Table 1.
１：ゲート部
1: Gate part
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