Process for making a stress-free plastic article

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

1980-12-23

1982-10-12

Hall, James R.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264314, B27J 500

Patent

active

043538550

ABSTRACT:
Disclosed is a method and 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 method is substantially free of all stresses.

REFERENCES:
patent: 4017572 (1977-04-01), Magone et al.
patent: 4032610 (1977-06-01), Spiller et al.

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