JP6997980B2 - Injection molding equipment for fiber reinforced thermoplastic resin compositions - Google Patents

Injection molding equipment for fiber reinforced thermoplastic resin compositions Download PDF

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JP6997980B2
JP6997980B2 JP2016107486A JP2016107486A JP6997980B2 JP 6997980 B2 JP6997980 B2 JP 6997980B2 JP 2016107486 A JP2016107486 A JP 2016107486A JP 2016107486 A JP2016107486 A JP 2016107486A JP 6997980 B2 JP6997980 B2 JP 6997980B2
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resin composition
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reinforced thermoplastic
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道男 小松
健太郎 奥野
真敏 中島
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DAIWA PLASTICS CO., LTD.
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Description

本発明は、繊維強化熱可塑性樹脂組成物用射出成形装置に関する。 The present invention relates to an injection molding apparatus for a fiber reinforced thermoplastic resin composition.

従来、樹脂成形体の強度を向上させるために、樹脂に炭素繊維等の繊維を配合することが行われている。ところが、前記炭素繊維は折れやすいため、通常はエポキシ樹脂等の熱硬化性樹脂に配合してプレス成形により前記樹脂成形体とする方法が採用されている。しかし、前記プレス成形では、高品位の製品を得ることが難しく、価格も高くなるという問題がある。 Conventionally, in order to improve the strength of a resin molded product, fibers such as carbon fibers are blended with the resin. However, since the carbon fiber is easily broken, a method of blending it with a thermosetting resin such as an epoxy resin and press-molding it to obtain the resin molded body is usually adopted. However, the press molding has a problem that it is difficult to obtain a high-quality product and the price is high.

一方、樹脂成形体の強度、熱伝導性、電磁波シールド性等の物性を向上させるために、熱可塑性樹脂中に炭素繊維を含む繊維強化熱可塑性樹脂組成物が提案されている（例えば、特許文献１参照）。前記繊維強化熱可塑性樹脂組成物によれば、射出成形により高品位の製品を安価に製造することが期待される。 On the other hand, in order to improve physical properties such as strength, thermal conductivity, and electromagnetic wave shielding property of a resin molded body, a fiber-reinforced thermoplastic resin composition containing carbon fibers in the thermoplastic resin has been proposed (for example, Patent Documents). 1). According to the fiber-reinforced thermoplastic resin composition, it is expected that a high-quality product can be produced at low cost by injection molding.

また、近年では、特に前記樹脂成形体の強度を改良するために、熱可塑性樹脂中に従来より長い９ｍｍ程度の長さの炭素繊維を配合した繊維強化熱可塑性樹脂組成物も開発されている。 Further, in recent years, in order to particularly improve the strength of the resin molded body, a fiber-reinforced thermoplastic resin composition in which carbon fibers having a length of about 9 mm, which is longer than the conventional one, is blended in the thermoplastic resin has been developed.

特開２０１４－３１４８２号公報Japanese Unexamined Patent Publication No. 2014-31482

しかしながら、熱可塑性樹脂中に前記炭素繊維を含む繊維強化熱可塑性樹脂組成物を用い、射出成形により樹脂成形体を形成しようとすると、射出成形の過程で該炭素繊維が折れて短くなってしまい、得られた樹脂成形体の強度を十分に向上させることができないという不都合がある。 However, when a fiber-reinforced thermoplastic resin composition containing the carbon fibers in the thermoplastic resin is used and an attempt is made to form a resin molded body by injection molding, the carbon fibers are broken and shortened in the process of injection molding. There is a disadvantage that the strength of the obtained resin molded product cannot be sufficiently improved.

本発明は、かかる不都合を解消して、熱可塑性樹脂中に繊維を含む繊維強化熱可塑性樹脂組成物を用い射出成形により樹脂成形体を形成するときに、該樹脂成形体に含有される該繊維が短くなることを抑制することができる繊維強化熱可塑性樹脂組成物用射出成形装置を提供することを目的とする。 INDUSTRIAL APPLICABILITY The present invention eliminates such inconvenience, and when a resin molded body is formed by injection molding using a fiber-reinforced thermoplastic resin composition containing fibers in the thermoplastic resin, the fibers contained in the resin molded body. It is an object of the present invention to provide an injection molding apparatus for a fiber-reinforced thermoplastic resin composition capable of suppressing shortening.

かかる目的を達成するために、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置は、固定型と、該固定型との間にキャビティを形成する可動型とからなる金型を備え、該固定型は、スクリューを内蔵し、熱可塑性樹脂中に繊維を含有する繊維強化熱可塑性樹脂組成物のペレットを外部から供給される熱により溶融するプリプランジャと、該プリプランジャの先端部に接続流路を介して連通し、該接続流路を介して該プリプランジャから供給される溶融された繊維強化熱可塑性樹脂組成物を、内蔵するピストンによりホットランナを介して該キャビティに射出するプランジャと、該キャビティと該ホットランナとの境界に形成されたゲートを開閉するゲートバルブとを備え、該接続流路の内径をφＡ、該プランジャが該ホットランナに連通する接続部の内径をφＢ、該ゲートの内径をφＣとするときに、該接続部の内径φＢと該ゲートの内径φＣとが溶融された繊維強化熱可塑性樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができる大きさであって、該接続流路の内径φＡが該ペレットに含有される繊維の長さの４４％以上であり、該接続部の内径φＢが該接続流路の内径φＡより大きく、該ゲートの内径φＣが該接続部の内径φＢより大きいことを特徴とする。 In order to achieve such an object, the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention comprises a mold including a fixed mold and a movable mold that forms a cavity between the fixed molds. The fixed type has a preplanger that has a built-in screw and melts pellets of a fiber-reinforced thermoplastic resin composition containing fibers in the thermoplastic resin by heat supplied from the outside, and a flow connected to the tip of the preplanger. A plunger that communicates through a path and ejects the molten fiber-reinforced thermoplastic resin composition supplied from the preplanger through the connecting flow path into the cavity via a hot runner by a built-in piston. A gate valve for opening and closing a gate formed at the boundary between the cavity and the hot runner is provided, the inner diameter of the connection flow path is φA, the inner diameter of the connection portion through which the plunger communicates with the hot runner is φB, and the gate. When the inner diameter of the connection portion is φC, the fibers contained in the fiber-reinforced thermoplastic resin composition in which the inner diameter φB of the connection portion and the inner diameter φC of the gate are melted are suppressed from concentrating in the axial direction of the flow. The inner diameter φA of the connection flow path is 44% or more of the length of the fiber contained in the pellet, and the inner diameter φB of the connection portion is larger than the inner diameter φA of the connection flow path. The inner diameter φC of the gate is larger than the inner diameter φB of the connection portion .

本発明の繊維強化熱可塑性樹脂組成物用射出成形装置によれば、まず、前記固定型と前記可動型とが型締めされることにより両者の間にキャビティが形成される。 According to the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, first, the fixed mold and the movable mold are molded to form a cavity between them.

次に、前記プリプランジャに供給された繊維強化熱可塑性樹脂組成物のペレットが、前記プリプランジャに外部から供給される熱と、前記スクリューにより撹拌されることとにより溶融され、溶融された繊維強化熱可塑性樹脂組成物（以下、溶融樹脂組成物と略記する）が得られる。前記溶融樹脂組成物は、前記プリプランジャから前記接続流路を介して前記プランジャに供給される。 Next, the pellets of the fiber-reinforced thermoplastic resin composition supplied to the preplanger are melted by being stirred by the heat supplied from the outside to the preplanger and the screw, and the melted fiber reinforcement is performed. A thermoplastic resin composition (hereinafter, abbreviated as a molten resin composition) can be obtained. The molten resin composition is supplied from the pre-plunger to the plunger via the connection flow path.

次に、前記プランジャに供給された前記溶融樹脂組成物は、前記ピストンに押圧されることにより前記ホットランナを介して前記ゲートバルブにより開閉される前記ゲートから射出され、前記キャビティに充填される。前記溶融樹脂組成物が前記キャビティに充填されたならば、前記ゲートバルブにより前記ゲートが閉じられ、該溶融樹脂組成物が該キャビティ内で冷却され固化されることにより樹脂成形体を得ることができる。 Next, the molten resin composition supplied to the plunger is ejected from the gate opened and closed by the gate valve via the hot runner by being pressed by the piston, and is filled in the cavity. When the molten resin composition is filled in the cavity, the gate is closed by the gate valve, and the molten resin composition is cooled and solidified in the cavity to obtain a resin molded body. ..

通常、前記プリプランジャで得られた前記溶融樹脂組成物が前記接続流路から前記プランジャに供給され、ランナ、前記ゲートを介して前記キャビティに射出される射出成形装置では、該接続流路の内径φＡと、該プランジャが該ランナに連通する接続部の内径φＢと、該ゲートの内径φＣとが、エネルギーロスを避けるために、φＡ＞φＢ＞φＣとなっている。前記射出成形装置では、φＡ＞φＢ＞φＣとすることにより、前記溶融樹脂組成物により細い流路を通過させてせん断発熱を起こさせ、該溶融樹脂組成物の粘度を低下させて流れやすくすることができると考えられている。 Usually, in an injection molding apparatus in which the molten resin composition obtained by the pre-plunger is supplied to the plunger from the connection flow path and injected into the cavity through the runner and the gate, the inner diameter of the connection flow path is reached. φA, the inner diameter φB of the connection portion through which the plunger communicates with the runner, and the inner diameter φC of the gate are φA> φB> φC in order to avoid energy loss. In the injection molding apparatus, by setting φA> φB> φC, the molten resin composition is allowed to pass through a narrow flow path to generate shear heat generation, and the viscosity of the molten resin composition is lowered to facilitate the flow. Is believed to be possible.

ところが、このような射出成形装置で、前記繊維強化熱可塑性樹脂組成物を用いて射出成形を行うと、前記接続流路、前記接続部、前記ゲートのそれぞれで、前記溶融樹脂組成物に含まれる繊維が流動の軸方向に集中する現象が起き、集中した前記繊維が相互に衝突し、或いは座屈することにより折れて短くなる。 However, when injection molding is performed using the fiber-reinforced thermoplastic resin composition in such an injection molding apparatus, each of the connection flow path, the connection portion, and the gate is included in the molten resin composition. A phenomenon occurs in which the fibers are concentrated in the axial direction of the flow, and the concentrated fibers collide with each other or buckle, so that the fibers are broken and shortened.

そこで、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、該接続流路の内径をφＡ、該プランジャが該ホットランナに連通する接続部の内径をφＢ、該ゲートの内径をφＣとするときに、該接続部の内径φＢと該ゲートの内径φＣとが溶融された繊維強化熱可塑性樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができる大きさであって、該接続流路の内径φＡが該ペレットに含有される繊維の長さの４４％以上であり、該接続部の内径φＢが該接続流路の内径φＡより大きく、該ゲートの内径φＣが該接続部の内径φＢより大きい。 Therefore, in the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, the inner diameter of the connection flow path is φA, the inner diameter of the connection portion where the plunger communicates with the hot runner is φB, and the inner diameter of the gate is φC. The size is such that the fibers contained in the fiber-reinforced thermoplastic resin composition in which the inner diameter φB of the connection portion and the inner diameter φC of the gate are melted can be prevented from concentrating in the axial direction of the flow. The inner diameter φA of the connection flow path is 44% or more of the length of the fiber contained in the pellet, the inner diameter φB of the connection portion is larger than the inner diameter φA of the connection flow path, and the inner diameter φC of the gate. Is larger than the inner diameter φB of the connection portion.

このようにすることにより、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置によれば、前記溶融樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができ、前記樹脂成形体に含有される前記繊維が短くなることを抑制することができる。 By doing so, according to the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, it is possible to prevent the fibers contained in the molten resin composition from concentrating in the axial direction of the flow. It is possible to prevent the fibers contained in the resin molded product from becoming shorter.

また、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置は、前記ホットランナを備えているので、該ホットランナにより前記溶融樹脂組成物が加熱されることにより、該溶融樹脂組成物の粘度の上昇を防ぐことができる。 Further, since the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention includes the hot runner, the molten resin composition is heated by the hot runner to obtain the viscosity of the molten resin composition. Can be prevented from rising.

また、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、前述のように、該接続流路の内径をφＡ、該プランジャが該ホットランナに連通する接続部の内径をφＢ、該ゲートの内径をφＣとするときに、該接続部の内径φＢと該ゲートの内径φＣとが溶融された繊維強化熱可塑性樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができる大きさであって、該接続流路の内径φＡが該ペレットに含有される繊維の長さの４４％以上であり、該接続部の内径φＢが該接続流路の内径φＡより大きく、該ゲートの内径φＣが該接続部の内径φＢより大きいので、前記キャビティに充填された前記溶融樹脂組成物の背圧が過大となり、前記ゲートバルブにより前記ゲートを閉じることが困難になることがある。 Further, in the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, as described above, the inner diameter of the connection flow path is φA, the inner diameter of the connection portion through which the plunger communicates with the hot runner is φB, and the gate. When the inner diameter of the connection portion is φC, the fibers contained in the fiber-reinforced thermoplastic resin composition in which the inner diameter φB of the connection portion and the inner diameter φC of the gate are melted are suppressed from concentrating in the axial direction of the flow. The inner diameter φA of the connection flow path is 44% or more of the length of the fiber contained in the pellet, and the inner diameter φB of the connection portion is larger than the inner diameter φA of the connection flow path. Since the inner diameter φC of the gate is larger than the inner diameter φB of the connection portion, the back pressure of the molten resin composition filled in the cavity may become excessive, and it may be difficult for the gate valve to close the gate. ..

そこで、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置において、前記ゲートバルブは前記キャビティに充填された前記溶融樹脂組成物の背圧に抗して前記ゲートを開閉自在であることが好ましい。 Therefore, in the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, it is preferable that the gate valve can open and close the gate against the back pressure of the molten resin composition filled in the cavity. ..

また、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、前記接続流路内の前記溶融樹脂組成物の温度ＴＡが２００～４００℃の範囲であり、前記プランジャが前記ホットランナに連通する接続部における該溶融樹脂組成物の温度ＴＢが０．９８ＴＡ＜ＴＢであり、前記ゲートにおける該溶融樹脂組成物の温度ＴＣが０．９８ＴＢ＜ＴＣであることが好ましい。 Further, in the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, the temperature TA of the molten resin composition in the connection flow path is in the range of 200 to 400 ° C., and the plunger is used as the hot runner. It is preferable that the temperature TB of the molten resin composition at the communicating connection portion is 0.98 T A < TB , and the temperature TC of the molten resin composition at the gate is 0.98 TB < TC . ..

本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、前記溶融樹脂組成物の温度が過度に低下すると、半固化状態となる部分が発生し、溶融状態の部分との間で剪断力が生じて該溶融樹脂組成物に含まれる繊維が折れて短くなることがある。そこで、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、装置内の各部の温度を前記条件とすることにより、前記溶融樹脂組成物が半固化状態となることを避けることができ、該溶融樹脂組成物に含有される繊維の長さが短くなることを抑制することができる。 In the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, when the temperature of the molten resin composition is excessively lowered, a portion in a semi-solidified state is generated, and a shearing force is generated between the molten resin composition and the molten resin composition. As a result, the fibers contained in the molten resin composition may be broken and shortened. Therefore, in the injection molding apparatus for fiber-reinforced thermoplastic resin composition of the present invention, it is possible to prevent the molten resin composition from being in a semi-solidified state by setting the temperature of each part in the apparatus as the above condition. It is possible to prevent the length of the fiber contained in the molten resin composition from being shortened.

また、本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、前記キャビティの、該キャビティ内に射出された前記溶融樹脂組成物の温度ＴＤが０．９８ＴＣ＝ＴＤとなる位置に該溶融樹脂組成物の温度を検知する温度センサを備え、該温度センサにより検知される温度ＴＤが０．９８ＴＣ＞ＴＤとなったときに装置を停止することが好ましい。 Further, in the injection molding apparatus for the fiber-reinforced thermoplastic resin composition of the present invention, the temperature T D of the molten resin composition injected into the cavity of the cavity is set to 0.98 TC = T D. It is preferable to include a temperature sensor for detecting the temperature of the molten resin composition and stop the apparatus when the temperature TD detected by the temperature sensor becomes 0.98TC > TD.

本発明の繊維強化熱可塑性樹脂組成物用射出成形装置では、前述のようにすることにより、溶融樹脂組成物に含有される繊維の長さが短くなっている不良品の発生を防止することができる。 In the injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention, it is possible to prevent the occurrence of defective products in which the length of the fiber contained in the molten resin composition is shortened by performing as described above. can.

本発明の繊維強化熱可塑性樹脂組成物用射出成形装置の一構成例を示す模式的断面図。FIG. 6 is a schematic cross-sectional view showing a configuration example of an injection molding apparatus for a fiber-reinforced thermoplastic resin composition of the present invention.

次に、添付の図面を参照しながら本発明の実施の形態についてさらに詳しく説明する。 Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

図１に示すように、本実施形態の繊維強化熱可塑性樹脂組成物用射出成形装置１は、固定型２と、固定型２との間にキャビティ３を形成する可動型４とからなる金型５を備える。固定型２は、プリプランジャ６と、プランジャ７と、ホットランナ８と、ゲート９を開閉するゲートバルブ１０とを備えている。 As shown in FIG. 1, the injection molding apparatus 1 for a fiber-reinforced thermoplastic resin composition of the present embodiment is a mold including a fixed mold 2 and a movable mold 4 that forms a cavity 3 between the fixed mold 2. 5 is provided. The fixed type 2 includes a pre-plunger 6, a plunger 7, a hot runner 8, and a gate valve 10 for opening and closing the gate 9.

プリプランジャ６は、熱可塑性樹脂中に繊維を含有する繊維強化熱可塑性樹脂組成物のペレットを投入するホッパ１１を上流側に備え、内部にスクリュー１２を備えている。プリプランジャ６は、その軸方向がプランジャ７の軸方向と交差するように配設されており、下流側の端部に設けられた接続流路１３を介してプランジャ７に連通している。プリプランジャ６は、ホッパ１１から投入された前記ペレットをスクリュー１２で撹拌することにより溶融し、溶融された前記繊維強化熱可塑性樹脂組成物（以下、溶融樹脂組成物と略記する）を接続流路１３からプランジャ７に供給する。 The pre-plunger 6 is provided with a hopper 11 on the upstream side for charging pellets of a fiber-reinforced thermoplastic resin composition containing fibers in the thermoplastic resin, and a screw 12 inside. The pre-plunger 6 is arranged so that its axial direction intersects the axial direction of the plunger 7, and communicates with the plunger 7 via a connection flow path 13 provided at an end on the downstream side. The preplanger 6 melts the pellets charged from the hopper 11 by stirring them with a screw 12, and connects the melted fiber-reinforced thermoplastic resin composition (hereinafter, abbreviated as the molten resin composition) to the connecting flow path. It is supplied from 13 to the plunger 7.

プランジャ７は、内部にピストン１４を備え、下流側の端部でホットランナ８に連通している。ホットランナ８は、上流側の端部でプランジャ７に連通する一方、下流側の端部でキャビティ３に連通し、キャビティ３との境界にゲート９を形成している。ホットランナ８は、下流側の外周にヒータ１５が配設されるか、又は図示しないヒータを備えている。 The plunger 7 has a piston 14 inside and communicates with the hot runner 8 at the downstream end. The hot runner 8 communicates with the plunger 7 at the upstream end, while communicates with the cavity 3 at the downstream end, forming a gate 9 at the boundary with the cavity 3. The hot runner 8 is provided with a heater 15 on the outer periphery on the downstream side, or is provided with a heater (not shown).

ゲートバルブ１０は、ホットランナ８の下流側の内部に配設され、駆動装置１６により駆動されることにより、ゲート９を開閉自在となっている。駆動装置１６は空圧シリンダであってもよいが、キャビティ３に充填された溶融樹脂組成物の背圧に抗してゲート９を開閉自在とするために、油圧シリンダ、サーボモータ、ステッピングモータ又は電磁弁であってもよい。 The gate valve 10 is arranged inside the hot runner 8 on the downstream side, and is driven by the drive device 16 to open and close the gate 9. The drive device 16 may be a pneumatic cylinder, but a hydraulic cylinder, a servomotor, a stepping motor, or a hydraulic cylinder, a servomotor, a stepping motor, or the like, in order to make the gate 9 openable and closable against the back pressure of the molten resin composition filled in the cavity 3. It may be a solenoid valve.

繊維強化熱可塑性樹脂組成物用射出成形装置１は、接続流路１３の内径をφＡ、プランジャ７がホットランナ８に連通する接続部１７の内径をφＢ、ゲート９の内径をφＣとするときに、接続部１７の内径φＢとゲート９の内径φＣとが溶融された繊維強化熱可塑性樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができる大きさであって、φＡが前記ペレットに含有される繊維の長さの４４％以上であり、接続部１７の内径φＢが接続流路１３の内径φＡより大きく、ゲート９の内径φＣが接続部１７の内径φＢより大きい。 In the injection molding apparatus 1 for a fiber-reinforced thermoplastic resin composition, when the inner diameter of the connection flow path 13 is φA, the inner diameter of the connection portion 17 through which the plunger 7 communicates with the hot runner 8 is φB, and the inner diameter of the gate 9 is φC. The size is such that the fibers contained in the fiber-reinforced thermoplastic resin composition in which the inner diameter φB of the connecting portion 17 and the inner diameter φC of the gate 9 are melted can be suppressed from concentrating in the axial direction of the flow. φA is 44% or more of the length of the fiber contained in the pellet, the inner diameter φB of the connecting portion 17 is larger than the inner diameter φA of the connecting flow path 13, and the inner diameter φC of the gate 9 is larger than the inner diameter φB of the connecting portion 17. ..

また、繊維強化熱可塑性樹脂組成物用射出成形装置１は、接続流路１３内の溶融樹脂組成物の温度ＴＡが２００～４００℃の範囲であり、プランジャ７がホットランナ８に連通する接続部１７における該溶融樹脂組成物の温度ＴＢが０．９８ＴＡ＜ＴＢであり、ゲート９における該溶融樹脂組成物の温度ＴＣが０．９８ＴＢ＜ＴＣであるようにされている。 Further, in the injection molding apparatus 1 for the fiber-reinforced thermoplastic resin composition, the temperature TA of the molten resin composition in the connection flow path 13 is in the range of 200 to 400 ° C., and the plunger 7 communicates with the hot runner 8. The temperature TB of the molten resin composition in the part 17 is 0.98 TB < TB , and the temperature TC of the molten resin composition in the gate 9 is 0.98 TB < TC . ..

また、繊維強化熱可塑性樹脂組成物用射出成形装置１は、キャビティ３内に温度センサ１８を備えている。温度センサ１８は、キャビティ３内に射出された前記溶融樹脂組成物の温度ＴＤが０．９８ＴＣ＝ＴＤとなる位置に配設されている。そして、繊維強化熱可塑性樹脂組成物用射出成形装置１では、温度センサ１８により検知される温度ＴＤが０．９８ＴＣ＞ＴＤとなったときに装置が停止されるようになっている。 Further, the injection molding apparatus 1 for a fiber-reinforced thermoplastic resin composition includes a temperature sensor 18 in the cavity 3. The temperature sensor 18 is arranged at a position where the temperature T D of the molten resin composition injected into the cavity 3 is 0.98 TC = T D. Then, in the injection molding apparatus 1 for the fiber-reinforced thermoplastic resin composition, the apparatus is stopped when the temperature T D detected by the temperature sensor 18 becomes 0.98 T C > T D.

次に、繊維強化熱可塑性樹脂組成物用射出成形装置１の作動について説明する。 Next, the operation of the injection molding apparatus 1 for the fiber-reinforced thermoplastic resin composition will be described.

繊維強化熱可塑性樹脂組成物用射出成形装置１により射出成形を行うときには、まず、可動型４を固定型２に近接する方向に移動させ、固定型２に当接させて型締めした後、ホッパ１１からプリプランジャ６に繊維強化熱可塑性樹脂組成物のペレットを投入する。前記ペレットは、ポリアミド、ポリプロピレン、ポリスチレン、ＡＢＳ、ポリアセタール、ポリブチレンテレフタレート、ポリカーボネート、ポリエチレンテレフタレート、液晶ポリマー、ポリフェニレンサルファイド、ポリサルホン、ポリエーテルエーテルケトン、ポリアミドイミド、ポリイミド、ポリ乳酸等の熱可塑性樹脂中に、長さ２～１１ｍｍの炭素繊維又はガラス繊維等の繊維が分散されて含有されている。このようなペレットとして、例えば、ポリアミド１２中に長さ９ｍｍの炭素繊維が分散されたペレット（ダイセルポリマー株式会社製、商品名：プラストロンＰ１２－ＣＦ３０－Ｍ１）を挙げることができる。 When injection molding is performed by the injection molding device 1 for a fiber-reinforced thermoplastic resin composition, first, the movable mold 4 is moved in a direction close to the fixed mold 2, brought into contact with the fixed mold 2 and molded, and then the hopper is used. From No. 11, pellets of the fiber-reinforced thermoplastic resin composition are put into the pre-plunger 6. The pellet is contained in a thermoplastic resin such as polyamide, polypropylene, polystyrene, ABS, polyacetal, polybutylene terephthalate, polycarbonate, polyethylene terephthalate, liquid crystal polymer, polyphenylene sulfide, polysulfone, polyether ether ketone, polyamideimide, polyimide , and polylactic acid. Contains fibers such as carbon fibers or glass fibers having a length of 2 to 11 mm in a dispersed manner. Examples of such pellets include pellets in which carbon fibers having a length of 9 mm are dispersed in polyamide 12 (manufactured by Daicel Polymer Co., Ltd., trade name: Plastron P12-CF30-M1).

プリプランジャ６に投入された前記繊維強化熱可塑性樹脂組成物のペレットは、スクリュー１２により撹拌されることにより溶融されて溶融樹脂組成物となり、所定量の該溶融樹脂組成物が接続流路１３からプランジャ７に供給される。 The pellets of the fiber-reinforced thermoplastic resin composition charged into the preplanger 6 are melted by being stirred by the screw 12 to form a molten resin composition, and a predetermined amount of the molten resin composition is supplied from the connection flow path 13. It is supplied to the plunger 7.

次に、プランジャ７に供給された前記溶融樹脂組成物は、ピストン１４に押圧されることによりホットランナ８を介してゲート９からキャビティ３に射出され、充填される。このとき、プリプランジャ６では、スクリュー１２の先端が図１に仮想線示するようにプリプランジャ６の先端に当接することにより接続流路１３を閉塞するようになっている。この結果、プランジャ７に供給された前記溶融樹脂組成物のプリプランジャ６への逆流を阻止することができ、所定量の前記溶融樹脂組成物が確実にキャビティ３に充填される。 Next, the molten resin composition supplied to the plunger 7 is injected into the cavity 3 from the gate 9 via the hot runner 8 by being pressed by the piston 14, and is filled. At this time, in the pre-plunger 6, the tip of the screw 12 abuts on the tip of the pre-plunger 6 as shown by a virtual line in FIG. 1 to block the connection flow path 13. As a result, the backflow of the molten resin composition supplied to the plunger 7 to the pre-plunger 6 can be prevented, and a predetermined amount of the molten resin composition is surely filled in the cavity 3.

次に、所定量の前記溶融樹脂組成物がキャビティ３に充填されたならば、ゲートバルブ１０によりゲート９が閉じられ、前記溶融樹脂組成物がキャビティ３内で冷却、固化されることにより繊維強化熱可塑性樹脂組成物からなる樹脂成形体が得られる。次いで、可動型４を固定型２から離間する方向に移動させ型開きすることにより、前記樹脂成形体が金型５から脱型されて取出される。 Next, when a predetermined amount of the molten resin composition is filled in the cavity 3, the gate 9 is closed by the gate valve 10, and the molten resin composition is cooled and solidified in the cavity 3 to reinforce the fibers. A resin molded product made of a thermoplastic resin composition can be obtained. Next, the movable mold 4 is moved in a direction away from the fixed mold 2 to open the mold, so that the resin molded body is removed from the mold 5 and taken out.

繊維強化熱可塑性樹脂組成物用射出成形装置１では、上述のように、接続流路１３の内径をφＡ、プランジャ７がホットランナ８に連通する接続部１７の内径をφＢ、ゲート９の内径をφＣとするときに、接続部１７の内径φＢとゲート９の内径φＣとが溶融された繊維強化熱可塑性樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができる大きさであって、φＡが前記ペレットに含有される繊維の長さの４４％以上であり、接続部１７の内径φＢが接続流路１３の内径φＡより大きく、ゲート９の内径φＣが接続部１７の内径φＢより大きい。 In the injection molding apparatus 1 for a fiber-reinforced thermoplastic resin composition, as described above, the inner diameter of the connection flow path 13 is φA, the inner diameter of the connection portion 17 through which the plunger 7 communicates with the hot runner 8 is φB, and the inner diameter of the gate 9 is φB. When φC is used, the size of the fiber contained in the fiber-reinforced thermoplastic resin composition in which the inner diameter φB of the connecting portion 17 and the inner diameter φC of the gate 9 are melted can be prevented from concentrating in the axial direction of the flow. In addition , φA is 44% or more of the length of the fiber contained in the pellet, the inner diameter φB of the connection portion 17 is larger than the inner diameter φA of the connection flow path 13, and the inner diameter φC of the gate 9 is the connection portion 17. The inner diameter of φB is larger than that of φB.

また、繊維強化熱可塑性樹脂組成物用射出成形装置１は、接続流路１３内の溶融樹脂組成物の温度ＴＡが２００～４００℃の範囲であり、プランジャ７がホットランナ８に連通する接続部１７における該溶融樹脂組成物の温度ＴＢが０．９８ＴＡ＜ＴＢであり、ゲート９における該溶融樹脂組成物の温度ＴＣが０．９８ＴＢ＜ＴＣであるようにされている。 Further, in the injection molding apparatus 1 for the fiber-reinforced thermoplastic resin composition, the temperature TA of the molten resin composition in the connection flow path 13 is in the range of 200 to 400 ° C., and the plunger 7 communicates with the hot runner 8. The temperature TB of the molten resin composition in the part 17 is 0.98 TB < TB , and the temperature TC of the molten resin composition in the gate 9 is 0.98 TB < TC . ..

この結果、前記溶融樹脂組成物に含有される前記繊維が折れてその長さが短くなることが抑制され、前記樹脂成形体に含有される繊維の長さを、前記ペレットに含有される繊維の長さの４５～５０％とすることができる。 As a result, it is suppressed that the fiber contained in the molten resin composition is broken and its length is shortened, and the length of the fiber contained in the resin molded body is set to the length of the fiber contained in the pellet. It can be 45-50% of the length.

また、繊維強化熱可塑性樹脂組成物用射出成形装置１では、キャビティ３内に配設された温度センサ１８により検知される温度ＴＤがＴＤ＜０．９８ＴＣとなったときには作動が停止される。 Further, in the injection molding apparatus 1 for a fiber-reinforced thermoplastic resin composition, the operation is stopped when the temperature T D detected by the temperature sensor 18 arranged in the cavity 3 becomes T D <0.98 TC . To.

次に、本発明の実施例を示す。 Next, an embodiment of the present invention will be shown.

〔実施例〕
本実施例では、ポリアミド１２中に長さ９ｍｍの炭素繊維が分散されたペレット（ダイセルポリマー株式会社製、商品名：プラストロンＰ１２－ＣＦ３０－Ｍ１）を用い、図１に示す繊維強化熱可塑性樹脂組成物用射出成形装置１により射出成形を行って、上部外径１００ｍｍ、底部外径５０ｍｍ、高さ５０ｍｍ、肉厚２ｍｍのカップ状樹脂成形体を得た。前記ペレットは８０℃の温度で５時間予備乾燥したものを用いた。 〔Example〕
In this embodiment, a pellet (manufactured by Daicel Polymer Co., Ltd., trade name: Plastron P12-CF30-M1) in which carbon fibers having a length of 9 mm are dispersed in polyamide 12 is used, and the fiber-reinforced thermoplastic resin shown in FIG. 1 is used. Injection molding was performed by the injection molding apparatus 1 for composition to obtain a cup-shaped resin molded body having an upper outer diameter of 100 mm, a bottom outer diameter of 50 mm, a height of 50 mm, and a wall thickness of 2 mm. The pellets used were pre-dried at a temperature of 80 ° C. for 5 hours.

本実施例において、繊維強化熱可塑性樹脂組成物用射出成形装置１は、接続流路１３の内径φＡを該炭素繊維の長さの４４％以上に当たる４ｍｍとし、プランジャ７がホットランナ８に連通する接続部１７の内径φＢを接続流路１３の内径φＡより大きくなる４．０２ｍｍとし、ゲート９の内径φＣをプランジャ７がホットランナ８に連通する接続部１７の内径φＢより大きくなる４．０５ｍｍとした。 In this embodiment, in the injection molding apparatus 1 for a fiber-reinforced thermoplastic resin composition, the inner diameter φA of the connection flow path 13 is set to 4 mm, which corresponds to 44% or more of the length of the carbon fiber, and the plunger 7 communicates with the hot runner 8. The inner diameter φB of the connection portion 17 is 4.02 mm, which is larger than the inner diameter φA of the connection flow path 13, and the inner diameter φC of the gate 9 is 4.05 mm, which is larger than the inner diameter φB of the connection portion 17 through which the plunger 7 communicates with the hot runner 8. did.

また、プリプランジャ６及び接続流路１３の温度を２６０℃とし、スクリュー１２の回転数３５ｒｐｍで前記ペレットを溶融して溶融樹脂組成物とした。この結果、接続流路１３内における前記溶融樹脂組成物の温度ＴＡは２６０℃であり、プランジャ７がホットランナ８に連通する接続部１７における該溶融樹脂組成物の温度ＴＢはＴＢ＞０．９８ＴＡである２５８℃であり、ゲート９における該溶融樹脂組成物の温度ＴＣはＴＣ＞０．９８ＴＢである２５６℃であった。 Further, the temperature of the pre-plunger 6 and the connecting flow path 13 was set to 260 ° C., and the pellet was melted at a rotation speed of the screw 12 of 35 rpm to obtain a molten resin composition. As a result, the temperature TA of the molten resin composition in the connection flow path 13 is 260 ° C., and the temperature TB of the molten resin composition in the connection portion 17 in which the plunger 7 communicates with the hot runner 8 is TB >. The temperature was 258 ° C., which was 0.98TA A , and the temperature TC of the molten resin composition at the gate 9 was 256 ° C. , which was TC > 0.98TB .

この状態で、ピストン１４の前進速度を３０ｍｍ／秒として、プランジャ７に供給された前記溶融樹脂組成物をピストン１４により押圧し、射出時間２．５秒、充填圧力１１０ＭＰａでキャビティ３に射出、充填した。射出時の金型５の温度は１２０℃とした。 In this state, the forward speed of the piston 14 is set to 30 mm / sec, the molten resin composition supplied to the plunger 7 is pressed by the piston 14, and the cavity 3 is injected and filled with an injection time of 2.5 seconds and a filling pressure of 110 MPa. did. The temperature of the mold 5 at the time of injection was 120 ° C.

前記溶融樹脂組成物をキャビティ３に充填した後、２５秒間冷却し、前記カップ状樹脂成形体を得た。前記カップ状樹脂成形体を目視で観察したところ、含有している炭素繊維の長さは４～４．５ｍｍであることが判明した。 After filling the cavity 3 with the molten resin composition, the cavity 3 was cooled for 25 seconds to obtain the cup-shaped resin molded product. When the cup-shaped resin molded body was visually observed, it was found that the length of the contained carbon fiber was 4 to 4.5 mm.

〔比較例〕
本比較例では、繊維強化熱可塑性樹脂組成物用射出成形装置１の接続流路１３の内径φＡを４ｍｍとし、プランジャ７がホットランナ８に連通する接続部１７の内径φＢをφＢ＜φＡとなる２．５ｍｍとし、ゲート９の内径φＣをφＣ＜φＢとなる２ｍｍとした以外は、前記実施例と全く同一にして前記カップ状樹脂成形体を得た。前記カップ状樹脂成形体を目視で観察したところ、含有している炭素繊維の長さは２．６～２．８ｍｍであり、前記実施例に比較して短くなっていることが判明した。 [Comparative example]
In this comparative example, the inner diameter φA of the connection flow path 13 of the injection molding apparatus 1 for the fiber reinforced thermoplastic resin composition is 4 mm, and the inner diameter φB of the connection portion 17 through which the plunger 7 communicates with the hot runner 8 is φB <φA. The cup-shaped resin molded product was obtained in exactly the same manner as in the above embodiment except that the diameter was 2.5 mm and the inner diameter φC of the gate 9 was 2 mm where φC <φB. When the cup-shaped resin molded body was visually observed, it was found that the length of the contained carbon fibers was 2.6 to 2.8 mm, which was shorter than that of the above-mentioned example.

１…繊維強化熱可塑性樹脂組成物用射出成形装置、 ２…固定型、 ３…キャビティ、 ４…可動型、 ５…金型、 ６…プリプランジャ、 ７…プランジャ、 ８…ホットランナ、 ９…ゲート、 １０…ゲートバルブ、 １２…スクリュー、 １３…接続流路、 １４…ピストン、 １７…接続部。 1 ... Injection molding device for fiber reinforced thermoplastic resin composition, 2 ... Fixed mold, 3 ... Cavity, 4 ... Movable mold, 5 ... Mold, 6 ... Preplanger, 7 ... Plunger, 8 ... Hot runner, 9 ... Gate , 10 ... Gate valve, 12 ... Screw, 13 ... Connection flow path, 14 ... Piston, 17 ... Connection part.

Claims (4)

固定型と、該固定型との間にキャビティを形成する可動型とからなる金型を備え、
該固定型は、スクリューを内蔵し、熱可塑性樹脂中に繊維を含有する繊維強化熱可塑性樹脂組成物のペレットを外部から供給される熱により溶融するプリプランジャと、
該プリプランジャの先端部に接続流路を介して連通し、該接続流路を介して該プリプランジャから供給される溶融された繊維強化熱可塑性樹脂組成物を、内蔵するピストンによりホットランナを介して該キャビティに射出するプランジャと、
該キャビティと該ホットランナとの境界に形成されたゲートを開閉するゲートバルブとを備える繊維強化熱可塑性樹脂組成物用射出成形装置であって、
該接続流路の内径をφＡ、該プランジャが該ホットランナに連通する接続部の内径をφＢ、該ゲートの内径をφＣとするときに、
該接続部の内径φＢと該ゲートの内径φＣとが溶融された繊維強化熱可塑性樹脂組成物に含まれる繊維が流動の軸方向に集中することを抑制することができる大きさであって、
該接続流路の内径φＡが該ペレットに含有される繊維の長さの４４％以上であり、該接続部の内径φＢが該接続流路の内径φＡより大きく、該ゲートの内径φＣが該接続部の内径φＢより大きいことを特徴とする繊維強化熱可塑性樹脂組成物用射出成形装置。 A mold composed of a fixed mold and a movable mold that forms a cavity between the fixed mold is provided.
The fixed type includes a preplanger that has a built-in screw and melts pellets of a fiber-reinforced thermoplastic resin composition containing fibers in a thermoplastic resin by heat supplied from the outside.
The molten fiber-reinforced thermoplastic resin composition that communicates with the tip of the pre-plunger via a connecting flow path and is supplied from the pre-plunger via the connecting flow path is passed through a hot runner by a built-in piston. And a plunger to inject into the cavity,
An injection molding apparatus for a fiber-reinforced thermoplastic resin composition comprising a gate valve for opening and closing a gate formed at a boundary between the cavity and the hot runner.
When the inner diameter of the connection flow path is φA, the inner diameter of the connection portion where the plunger communicates with the hot runner is φB, and the inner diameter of the gate is φC,
The size is such that the fibers contained in the fiber-reinforced thermoplastic resin composition in which the inner diameter φB of the connection portion and the inner diameter φC of the gate are melted can be suppressed from concentrating in the axial direction of the flow.
The inner diameter φA of the connection flow path is 44% or more of the length of the fiber contained in the pellet, the inner diameter φB of the connection portion is larger than the inner diameter φA of the connection flow path, and the inner diameter φC of the gate is the connection. An injection molding apparatus for a fiber-reinforced thermoplastic resin composition, which is characterized in that the inner diameter of the portion is larger than φB . 請求項１記載の繊維強化熱可塑性樹脂組成物用射出成形装置において、前記ゲートバルブは前記キャビティに充填された前記溶融された繊維強化熱可塑性樹脂組成物の背圧に抗して前記ゲートを開閉自在であることを特徴とする繊維強化熱可塑性樹脂組成物用射出成形装置。 In the injection molding apparatus for a fiber-reinforced thermoplastic resin composition according to claim 1, the gate valve opens and closes the gate against the back pressure of the molten fiber-reinforced thermoplastic resin composition filled in the cavity. An injection molding device for a fiber-reinforced thermoplastic resin composition, which is characterized by being flexible. 請求項１又は請求項２記載の繊維強化熱可塑性樹脂組成物用射出成形装置において、前記接続流路内の前記溶融された繊維強化熱可塑性樹脂組成物の温度ＴＡが２００～４００℃の範囲であり、前記プランジャが前記ホットランナに連通する接続部における該溶融された繊維強化熱可塑性樹脂組成物の温度ＴＢが０．９８ＴＡ＜ＴＢであり、前記ゲートにおける該溶融された繊維強化熱可塑性樹脂組成物の温度ＴＣが０．９８ＴＢ＜ＴＣであることを特徴とする繊維強化熱可塑性樹脂組成物用射出成形装置。 In the injection molding apparatus for a fiber-reinforced thermoplastic resin composition according to claim 1 or 2, the temperature TA of the melted fiber-reinforced thermoplastic resin composition in the connection flow path is in the range of 200 to 400 ° C. The temperature TB of the molten fiber-reinforced thermoplastic resin composition at the connection portion where the plunger communicates with the hot runner is 0.98 TA < TB , and the molten fiber reinforcement at the gate. An injection molding apparatus for a fiber-reinforced thermoplastic resin composition, wherein the temperature TC of the thermoplastic resin composition is 0.98 TB < TC . 請求項３記載の繊維強化熱可塑性樹脂組成物用射出成形装置において、前記キャビティの、該キャビティ内に射出された前記溶融された繊維強化熱可塑性樹脂組成物の温度ＴＤが０．９８ＴＣ＝ＴＤとなる位置に該溶融された繊維強化熱可塑性樹脂組成物の温度を検知する温度センサを備え、該温度センサにより検知される温度ＴＤが０．９８ＴＣ＞ＴＤとなったときに装置を停止することを特徴とする繊維強化熱可塑性樹脂組成物用射出成形装置。 In the injection molding apparatus for a fiber-reinforced thermoplastic resin composition according to claim 3 , the temperature T D of the melted fiber-reinforced thermoplastic resin composition injected into the cavity of the cavity is 0.98 TC . When a temperature sensor for detecting the temperature of the melted fiber-reinforced thermoplastic resin composition is provided at a position where = T D , and the temperature T D detected by the temperature sensor becomes 0.98TC > T D. An injection molding device for a fiber reinforced thermoplastic resin composition, which comprises stopping the device.
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