The Japan Steel Works, Ltd.

Yukihiro Sumihiro

Shoso Nishida

Kazuki Fujita

Akira Yasue

Tadamoto Sakai

Kazuya Tsuji

Kunihiko Koyanagi

Yasufumi Fujita

Noriaki Hashimoto

Hideki Chiba

Daisuke Kunihiro

Rika Miyoshi

Kayoko Yokota

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

A process for producing polylactic acid includes the steps of polycondensing lactic acid to a lactic acid prepolymer having a weight-average molecular weight of 10,000-50,000 in a batch-type polymerization reactor, and polycondensing the lactic acid prepolymer to lactic acid polymer having a weight-average molecular weight of at least 100,000 by means of a screw-type extruder.

Process for producing lactic acid polymers and a process for the direct

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Hiroshima, Japan

Yukihiro Sumihiro