Method of and apparatus for forming cups of expanded resin

Details Method of and apparatus for forming cups of expanded resin Method of and apparatus for forming cups of expanded resin

1986-10-03

1988-07-19

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264321, 264337, 264531, 264573, 264DIG66, 425 4R, 4253421, 425384, 425398, C08J 922, B29C 6722, B29C 4356

Patent

active

047583940

ABSTRACT:
Forming method of producing thin-walled finished articles such as cups of expanded resin including steps of: heating beads of expandable thermoplastic resin in a mold cavity of a preforming mold, causing the beads to be expanded and fused together to produce a preformed article; transferring the preformed article as pressurized in an atmosphere under pressure to a finish-forming mold; and compressively forming the preformed article with the finish-forming mold. Also, disclosed in apparatus to be used for embodying the method of forming expanded resin cups, including: a pressure chamber held as pressurized, a preforming mold in which beads of expandable thermoplastic resin introduced in the mold cavity are heated, causing the beads to be expanded and fused together to produce a preformed article; male member transferring means for transferring the male member of the preforming mold together with the preformed article, to a position opposite to the female member of a finish-forming mold; and a finish-forming mold for heating, compressively forming, and cooling the preformed article to produce a thin-walled finished article, with the preforming mold and the finish-forming mold being both disposed in the pressurized chamber.

REFERENCES:
patent: 3897899 (1975-08-01), Schuff et al.
patent: 4106884 (1978-08-01), Jegelka
patent: 4260571 (1981-04-01), Ritter

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