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Title:
METHOD OF INJECTION-MOLDING HOLLOW MOLDED ARTICLE, MOLD FOR INJECTION MOLDING, AND BOOT MADE OF RESIN
Document Type and Number:
WIPO Patent Application WO/2006/104083
Kind Code:
A1
Abstract:
A method of injection molding for producing a cylindrical hollow molded article open at each end. A mold comprising a cavity mold (10) and a core mold (20) to be disposed therein is provided with a domed gate (40) so that the gate projects from one open end of the hollow molded article, which is to be molded in a molding space (30) of the mold, outward in the axial direction for the molded article. A molten thermoplastic resin is injected through one point of the top part of the domed gate (40) into the molding space (30) toward the axial direction of the hollow molded article to be molded in the molding space. The molding space is thus filled with the molten resin to mold a hollow molded article which is close at one end. Thereafter, the mold is opened and high-pressure air is blown into the hollow molded article to take it out of the core mold (20). That close-end part of the molded article taken out which begins with the gate part is cut off. Thus, a cylindrical hollow molded article open at each end, such as, e.g., a constant velocity joint boot, is obtained.

Inventors:
Noda, Yasushi (5-5 Oikecho 1-chome, Suma-ku Kobe-sh, Hyogo 26, 65400, JP)
Takesada, Kentaro (18-16-401, Kikugaokacho Hirakata-sh, Osaka 91, 57300, JP)
Application Number:
PCT/JP2006/306110
Publication Date:
October 05, 2006
Filing Date:
March 27, 2006
Export Citation:
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Assignee:
KANEKA CORPORATION (2-4 Nakanoshima 3-chome, Kita-ku Osaka-sh, Osaka 88, 53082, JP)
Noda, Yasushi (5-5 Oikecho 1-chome, Suma-ku Kobe-sh, Hyogo 26, 65400, JP)
Takesada, Kentaro (18-16-401, Kikugaokacho Hirakata-sh, Osaka 91, 57300, JP)
International Classes:
B29C45/43; B29C45/26; F16D3/84; F16J3/04; F16J15/52; B29L23/18; B29L31/26
Foreign References:
JPH11166624A1999-06-22
JP2548165Y21997-09-17
JPH0492166A1992-03-25
JPH1073162A1998-03-17
JP2004315803A2004-11-11
JP2001116057A2001-04-27
Attorney, Agent or Firm:
Yanagino, Takao (Noskmard building, 15-5 Miyahara 1-chome, Yodogawa-k, Osaka-shi Osaka 03, 53200, JP)
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