Preparation of crosslinked polyolefin foams and the mold

Details Preparation of crosslinked polyolefin foams and the mold Preparation of crosslinked polyolefin foams and the mold

1976-03-15

1978-02-14

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

249 82, 264DIG18, 264DIG83, 425817R, 425DIG14, B29D 2700

Patent

active

040738442

ABSTRACT:
In a method for the preparation of crosslinked polyolefin foams by charging a polyolefin or its blend with other thermoplastic resins containing a crosslinking agent, foaming agent and if necessary a filler into the heated mold having a changeable cavity and, after decomposition of the crosslinking and foaming agents, retracting the moving-plate of the mold by a definite distance to increase the cavity and at the same time cooling the mold, an improvement for the preparation of the crosslinked polyolefin foams having excellent appearance and dimensional stability, comprising using a mold of which the moving-plate is constructed with a body and a sliding-piece, the body holding the piece slidably whereby the sliding-piece is left behind owing to sliding between the two even on rapid retraction of the body and then retracts at the rate corresponding to the foaming pressure of the resin, in other words, at a self-controllable rate and the mold for the preparation thereof. Furthermore an improvement using a mold of which the side-plate is constructed with a body and a piece which is freely attachable to or removable from the body, and the mold. And both the sliding-piece and the side-plate piece are exchangeable in order to change the mode of the molded products.

REFERENCES:
patent: 2530289 (1950-11-01), Cook
patent: 3029472 (1962-04-01), Fischer
patent: 3058161 (1962-10-01), Beyer et al.
patent: 3098831 (1963-07-01), Carr
patent: 3098832 (1963-07-01), Pooley et al.
patent: 3376238 (1968-04-01), Gregorian et al.
patent: 3394214 (1968-07-01), Benning
patent: 3596318 (1971-08-01), Kyritsis et al.
patent: 3923922 (1975-12-01), Grant

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