Production process of expansion-molded article

Details Production process of expansion-molded article Production process of expansion-molded article

1990-12-19

1992-02-04

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264321, 264335, 425 4R, B29C 3506, B29C 3304

Patent

active

050858149

ABSTRACT:
An expansion-molded article is produced by filling prefoamed thermoplastic particles in a mold cavity formed in combination of mold sections, through each of which plural heating medium holes are defined, and then feeding a heating medium such as steam through the holes to heat and fusion-bond the particles into the article conforming with the mold cavity. Each of the mold sections is covered by a permeable porous sheet at least over the heating medium on a side of the mold cavity.

REFERENCES:
patent: 3255286 (1966-06-01), Luc-Belmont
patent: 3263010 (1966-07-01), Shultz
patent: 3823213 (1974-07-01), Stastny et al.
patent: 4031179 (1977-06-01), Tatzel jet al.
patent: 4206166 (1980-06-01), Hayashi et al.
patent: 4333897 (1982-06-01), Hayashi et al.
patent: 4456573 (1984-06-01), Ragazzini et al.
patent: 4698191 (1987-10-01), Endo et al.
patent: 4818451 (1989-04-01), Arai et al.

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