The Japan Steel Works, Ltd.

Akira Yasue

Shoso Nishida

Kazuya Tsuji

Kazuki Fujita

Akio Ono

Yasufumi Fujita

Hideki Chiba

Daisuke Kunihiro

Shigeki Inoue

Daigo Saga

Masahiko Taketani

Yukihiro Sumihiro

Takashi Harada

The present invention provides a kneading method for a fiber-reinforced thermoplastic resin with which dispersibility of reinforcement fibers is enhanced and sufficient reinforcement fibers having a proper fiber length remain, and a fiber-reinforced thermoplastic resin plasticizing device and an extruding machine for carrying out the method. The kneading method comprises supplying a thermoplastic resin and reinforcement fibers into a cylinder of a plasticizing device, and rotating a screw to obtain a fiber-reinforced thermoplastic resin, wherein the size of a clearance between the bore of the cylinder and the screw is made different between an upstream side in the vicinity of a reinforcement fiber loading port and a downstream side, so that the clearance becomes larger from the vicinity of the reinforcement fiber loading port toward the downstream side compared with the upstream side.

Kneading method for fiber-reinforced thermoplastic resin, plasticizing device, and extruding machine

The present invention addresses the problem of providing a molding method capable of molding a molded article having excellent strength and reducing manufacturing costs by shortening a molding cycle when obtaining a molded article from a fiber-reinforced thermoplastic resin by compression molding. The present invention relates to a molding method which obtains a fiber-reinforced thermoplastic resin by kneading a thermoplastic resin and a reinforcing fiber (), and a molded article from the fiber-reinforced thermoplastic resin by compression molding. The molding method of the molded article comprising the fiber-reinforced thermoplastic resin according to the present invention comprises: a molding step for obtaining a first molded article from a predetermined amount of a fiber-reinforced thermoplastic resin through a molding die (); a carrying-in step for opening the molding die (), taking out the first molded article, and inserting the first molded article into a cooling die (); and a compression cooling step for cooling the first molded article by compressing the first molded article through the cooling die ().

Molding method and molding apparatus of molded article comprising fiber-reinforced thermoplastic resin

[Problem] To provide an injection apparatus including a flow path switching mechanism that is simple in construction and low in cost. [Solution] An injection apparatus () includes a plasticization device () for melting resin, a first and second plunger injection devices () for measuring an amount of resin and injecting the resin, an injecting portion (), and a flow path switching block () that connects the plasticization device, the first and second plunger injection devices and the injecting portion together. A first to fourth connecting flow paths () and a flow path switching valve () are provided in the flow path switching block (). The plasticization device (), the first plunger injection device (), the injecting portion () and the second plunger injection device () are connected to the first to fourth connecting flow paths (), respectively. When the flow path switching valve () is switched to a first position, the first and second connecting flow paths () communicate with each other, and the third and fourth connecting flow paths () communicate with each other, whereas when the flow path switching valve () is switched to a second position, the first and fourth connecting flow paths () communicate with each other and the first and third connecting flow paths () communicate with each other.

Injection device provided with flow path switching block

The present invention provides a fiber-reinforced resin intermediate material, including not only a thermoplastic resin but also a thermosetting resin, in which defects such as voids are difficult to be generated and which is excellent in shaping ability; and a method for manufacturing the same. The fiber-reinforced resin intermediate material according to the present invention is a fiber-reinforced resin intermediate material formed by attaching a resin to an outer surface part of a reinforcing fiber substrate formed of reinforcing fibers subjected to opening and heating the resin to a temperature equal to or higher than the melting point of the resin to impregnate the reinforcing fiber substrate with the resin, wherein the reinforcing fiber substrate has void space that is opened on an outer surface thereof and the resin is in a semi-impregnated state.

Fiber-reinforced resin intermediate material and method for manufacturing same

Growing community of inventors

Hiroshima, Japan

Akira Yasue