Apparatus for making a stress-free plastic article

Details Apparatus for making a stress-free plastic article Apparatus for making a stress-free plastic article

1980-12-23

1982-06-15

Hall, James R.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including shaping means comprising fluid pressure contacting...

425389, 156285, A01J 2100

Patent

active

043348505

ABSTRACT:
Disclosed is an apparatus for making stress free plastic articles from plastic particles such as powder utilizing heat and pressure in which a quantity of plastic particles is supplied to a first member, a flexible diaphragm is disposed in opposed relationship to said first member with said plastic particles therebetween, a microporous air release means is positioned between said plastic particles and said flexible diaphragm, a fluid-like pressure is applied to said diaphragm to cause said diaphragm to apply an even fluid-like pressure through said air release means to said plastic particles, heat is applied to said plastic particles while under said fluid-like pressure and any entrapped gases between the particles is vented by means of the air release means. The pressure and heat are controlled to effect a consolidation of the plastic particles into the article. A second diaphragm may be used on the opposite side of said first diaphragm and either one or both of said diaphragms may be a sealed envelope to which fluid pressure is applied. The plastic article produced by the apparatus is substantially free of all stresses.

REFERENCES:
patent: 3833333 (1974-09-01), Britten
patent: 3891738 (1975-06-01), Shen

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