B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
18/1025, 18/1035
B30B 11/00 (2006.01) B29G 1/00 (1980.01)
Patent
CA 1121960
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.
308318
Garabedian Armen
Osler Hoskin & Harcourt Llp
LandOfFree
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