Thermoforming flexible plastic foam shells

Details Thermoforming flexible plastic foam shells Thermoforming flexible plastic foam shells

C - Chemistry, Metallurgy

08

J

18/653

C08J 9/36 (2006.01) B29C 51/04 (2006.01) B29C 51/10 (2006.01) B29C 51/42 (2006.01)

Patent

CA 1291607

Abstract of Disclosure An improved method and apparatus for rapidly forming plastic foam shells from a flexible foam sheet. The foam sheet is i??er mittently passed through a radiaent heating unit and is rapidly heated on both sides to 130-250°F to soften the foam. The heated foam sheet is immediately passed through a forming die unit in which the foam sheet is deformed partly into the die cavity by withdrawal of air from the cavity, and a die plug descends and final forms a shell while rapidly cooling the foam shell to below its plastic deformation temperature. By this forming method and apparatus. ethylene-containing foam shells having a depth 10-25 times the foam sheet initial thickness are rapidly formed at 10-30 cycles/minute.

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