Patents Assigned to Societe Nouvelle du Plastique
  • Production of hollow plastic bodies
    Patent number: 4086315
    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
    Inventor: Tadeusz Piotrowski