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

B - Operations, Transporting

29

C

18/652

B29C 67/20 (2006.01) B29C 44/56 (2006.01) B29C 33/30 (2006.01)

Patent

CA 1250117

ABSTRACT OF THE DISCLOSURE Forming method of producing thin-walled finished arti- cles 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 expand- ed and fused together to produce a preformed article; trans- ferring the preformed article as pressurized in an atmo- sphere under pressure to a finish-forming mold; and compres- sively 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, com- pressively 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.

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