Method and mold for the discontinuous production of foam plastic

Details Method and mold for the discontinuous production of foam plastic Method and mold for the discontinuous production of foam plastic

1975-01-23

1977-03-29

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 55, 264313, B29D 2704

Patent

active

040149676

ABSTRACT:
Shaped, foam plastic parts are made in a lightweight shaped, open trough-like mold having a coherent sheet metal interior comovable insert and related comovable floating lid, wherein said insert is positioned and adapted to slidably elevate within the interior surface of said trough coincident with the expansion of an internally housed and expandable foamable reaction mixture. As the reaction mixture expands, the foam freely expands upwardly during a first stage of the method to at least a height of approximately 50% of that desired for the plastic part. At that point the expanding foam engages an inwardly projecting flange portion of the comovable insert upon which is seated a comovable floating lid. Upon engaging the flange portion, the foam desired plastic part continues to expand through a second stage wherein the comovable insert and seated comovable floating lid are carried upward to a desired final foaming height, thereby forming a homogeneous foamed plastic part having substantially uniform properties throughout.

REFERENCES:
patent: 2649620 (1953-08-01), Miller
patent: 2753277 (1956-07-01), Smithers
patent: 3056168 (1962-10-01), Terry
patent: 3291873 (1966-12-01), Bakin
patent: 3840628 (1974-10-01), Stastny et al.

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