Abstract: Hollow plastic bodies are obtained by a process wherein plastic material is blown within a mold. This process includes heat injecting of the plastic material under pressure into a mold having a blow plunger and centering means for the head of the plunger to provide a parison having impressions from the centering means, transferring the plunger and associated parison into a mold, applying a force on parts of the parison that have impression holes to close the holes by extrusion, blowing the parison and unmolding the hollow body thus obtained.
Type:
Grant
Filed:
August 26, 1976
Date of Patent:
April 25, 1978
Assignees:
Tadeusz Piotrowski, Societe Nouvelle du Plastique