Mitsui Petrochemical Industries, Ltd.

Sumitomo Wiring Systems, Limited

Mitsui Chemicals, Inc.

Katunari Nishimura

Fumitoshi Ikejiri

Akinori Toyota

Masamitsu Chishima

Tetsuo Kato

Masahiro Kanda

Takao Nozaki

Akira Nabeshima

Sanehiro Yamamoto

Yoshikatsu Amimoto

Takumi Murata

Yoshihiro Yoshimura

Masahiro Yamada

A pipe molding die of the present invention is capable of rectifying a flow of a molten resin by a resin reservoir and uniformizing the flow of the resin extruded from the die in whichever position in a peripheral direction on a flow path within the die. Consequently, ununiformity in wall thickness of the resin pipe to be molded can be eliminated. The pipe molding die comprises a throttle part as one of components thereof, which includes a core, a shell part fitted to the core and a resin reservoir as a portion of a flow path which is formed between the core and the shell part. A molten, resin as a pipe raw material flows through the flow path. The resin reservoir is provided in at least one of the core and the shell part, and takes a ring-like shape circumscribing a central axis of the pipe molding die with the central axis centered. The resin reservoir assumes a recessed shape in cross-section.

Pipe extrusion die

Disclosed is a thermoplastic resin composition comprising

Thermoplastic resin composition and use thereof

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Growing community of inventors

Yamaguchi, Japan

Katunari Nishimura