Method for producing resin article having undercut shape

Details Method for producing resin article having undercut shape Method for producing resin article having undercut shape

1997-11-18

2000-04-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264532, 264550, 425529, 425533, B29C 4906, B29C 5134

Patent

active

060457465

ABSTRACT:
A resin molded article having a highly expanded undercut shape and a uniform wall thickness distribution is produced with good productivity by forming a parison as an intermediate molded article by injection molding a thermoplastic resin, expanding said parison in open molds prior to blow molding of the parison in the final shape, then closing the molds, and blow molding said parison in the closed molds to form the final shape of the article.

REFERENCES:
patent: 3244778 (1966-04-01), Ninneman
patent: 3298893 (1967-01-01), Allen
patent: 3892830 (1975-07-01), Hudson et al.
patent: 3949125 (1976-04-01), Roberts
patent: 4108937 (1978-08-01), Martineu et al.
patent: 4465199 (1984-08-01), Aoki
patent: 5403538 (1995-04-01), Maeda

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