Title:
PRODUCTION OF RESIN TUBULAR MEMBER
Document Type and Number:
Japanese Patent JP3241490
Kind Code:
B2
Abstract:
PURPOSE: To simply mold a resin tubular member having a smooth inner surface and uniform in wall thickness.
CONSTITUTION: A split type mold is equipped with a cavity 14 prescribing a resin tubular member 1 bent in a three-dimensional direction and the unnecessary parts 6,7 integrally molded at both ends thereof and a core mold insertion hole for allowing a core mold to protrude to one end of the cavity 14. The mold is clamped and the leading end part of the core mold 13 is allowed to protrude to one end of the cavity 14 and a molten resin is injected in the cavity so as to cover the leading end part of the core mold 13 to form a bottomed cylindrical body. Thereafter, the injection of the molten resin is continuously performed while the bottomed cylindrical body is expanded by injecting a pressure fluid into the cylindrical body through a passage 13a to fill the bottomed cylindrical body with the molten resin corresponding to the expansion thereof to mold a hollow molded product. After cooling, both unnecessary parts 6,7 are cut off at both cutting parts A, B.
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Inventors:
Mitsunobu Matsuo
Masahiko Adachi
Masahiko Adachi
Application Number:
JP13541293A
Publication Date:
December 25, 2001
Filing Date:
May 13, 1993
Export Citation:
Assignee:
Kyoraku Co., Ltd.
International Classes:
B29C45/00; B29C45/17; B29C49/06; B29C69/00; (IPC1-7): B29C45/00; B29C49/06; B29C69/00
Domestic Patent References:
| JP584762A |
Attorney, Agent or Firm:
Yoshiro Sakamoto