Method for releasing molded synthetic resin products from a mold

Details Method for releasing molded synthetic resin products from a mold Method for releasing molded synthetic resin products from a mold

1990-02-13

1991-02-19

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425556, 425437, B29C 4543

Patent

active

049942280

ABSTRACT:
A gas accumulation space, in which a predetermined amount of a gas is to accumulate and which communicates with said gas passageway, is located in a mold. After a cavity of the mold has been filled with a synthetic resin but before the mold is opened, the gas is fed into the gas passageway and the gas accumulation space until the pressure of the gas in the gas passageway and the gas accumulation space reaches a predetermined value. After the pressure of the gas in the gas passageway and the gas accumulation space has reached the predetermined value, the gas passageway is closed at a position upstream from where the gas passageway communicates with the gas accumulation space. When the mold clamping force is released in the course of opening the mold, the gas, which has accumulated in the gas accumulation space and parts of the gas passageway located downstream from the position at which the gas passageway has been closed, is caused to be jetted to a position between the molded synthetic resin product and the molding surface of the mold in order to release the molded synthetic resin product from the mold.

REFERENCES:
patent: 4364895 (1982-12-01), Underwood
patent: 4812281 (1989-03-01), Beard et al.

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