Method of molding articles of polymeric foam substantially free

Details Method of molding articles of polymeric foam substantially free Method of molding articles of polymeric foam substantially free

1975-04-15

1977-04-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264313, 264314, 264338, 425817R, 425DIG19, B29D 2704

Patent

active

040175723

ABSTRACT:
An improved molding apparatus is described for use with relatively light weight molds, particularly molds for articles having a plurality of voids therein. A light weight two-piece mold, one-half being substantially rigid and the other relatively flexible, is disposed in a jig. The two halves of the mold are held in sealing relationship by inserting a hollow inflatable bag between the exterior of the relatively flexible mold piece and the interior wall of the adjacent jig member and inflating said bag to a pressure superior to that exerted by the expanding foam mix in the mold.
The use of the improved apparatus obviates the need for molds of high structural strength (and hence excessive weight) and gives molded articles, particularly those of complex configuration, which are free from flashing.

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