Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Atsushi Yamamoto

Naoyuki Tashiro

Takayasu Fujiura

Naoki Kikuchi

Hiroshi Kawaguchi

Kazuhisa Fukutani

Tatsuya Tanaka

Yoshiaki Matsubara

Katsumi Ogawa

Tsutomu Nagaoka

Shinichi Harada

Kentaro Okuno

Masamitsu Nakatani

To provide continuous fiber-reinforced thermoplastic pellets having a good dispersion property of a reinforcing fiber bundle in injection molded articles and capable of achieving a satisfactory outward appearance of the injection molded articles and satisfying a mechanical strength of the injection molded articles by fully exerting the reinforcing effect, and a manufacturing method of the same. In continuous fiber-reinforced thermoplastic resin pellets manufactured by letting a long reinforcing fiber bundle be impregnated with molten thermoplastic resin and pultruding the resin-impregnated reinforcing fiber bundle with twisting, followed by the cutting of a rod-shaped composition formed of the twisted resin-impregnated reinforcing fiber bundle into pellets, a volume filling ratio V, which is a proportion of a cross section area of the reinforcing fiber bundle in a cross section area of a pellet cross section in a direction perpendicular to a pellet longitudinal direction, is in a range of 70% to 20%, and a twisting pitch P given by P=L/d (where L is a traveling length of a twist in a rod-shaped composition longitudinal direction per rotation of the rod-shaped composition, and d is a diameter of a circle comparable to an area of a rod-shaped composition cross section) is in a range of 2.5 to 36 (m/rev&#xb7;m).

Continuous fiber-reinforced thermoplastic resin pellets and manufacturing method of the same

A manufacturing apparatus of a fiber-reinforced resin strand including spreaders that spread a reinforcing fiber bundle and are provided inside a crosshead to which a molten resin material is supplied continuously from an extruding machine, twisting rollers provided at a downstream position from an exit nozzle of the crosshead and that pultrude a fiber-reinforced resin strand formed of a resin-impregnated fiber bundle from the exit nozzle while imparting twists thereto, and twist retaining rollers provided at a downstream position from the twisting rollers and that retain twists of the fiber-reinforced resin strand. The twisting rollers and the twist retaining rollers are made of metal with asperities being formed on the surface thereof. The manufacturing apparatus can achieve excellent durability and is capable of manufacturing a fiber-reinforced resin strand at a high production rate without causing slipping.

Manufacturing apparatus of fiber-reinforced resin strand

The invention provides a natural fiber-reinforced thermoplastic resin injection molding having an excellent ability to discharge static electricity. The natural fiber-reinforced thermoplastic resin injection molding is obtained by injection-molding with using natural fiber-reinforced thermoplastic resin pellets as a molding feedstock containing natural fibers as reinforcing fibers, has a natural fiber content of from 20 to 60 wt %. The natural fibers have an average length of from 1.5 to 4.0 mm. The natural fiber-reinforced thermoplastic resin injection molding has an electrostatic voltage half-life, as determined by the half-life measurement method specified in JIS L 1094, of less than 40 seconds.

Natural fiber-reinforced thermoplastic resin injection molding

A continuous casting equipment which can be applied to a wide variation of casting capacity for continuous casting and by which a continuous casting operation can be performed with safety. The continuous casting equipment comprises a tundish for receiving molten metal poured from a ladle and for pouring the molten metal into a mold, a travelling truck for carrying the tundish between a molding section at which the mold is located and a skimming section at which molten scum in the tundish is to be discharged, and a tilting apparatus located at the skimming section for tilting the tundish together with the travelling truck on which the tundish is carried to allow molten scum to be discharged from within the tundish. Also an improved continuous casting method is disclosed.

Continuous casting equipment and continuous casting method

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Takasago, Japan

Atsushi Yamamoto