Process for the production of expanded synthetic material articles having variable physical characteristics
AssigneeSaplest S.A.
InventorsGuy Lalloz, Gabriel Joly
Life of this patent
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Abstract
According to the process, the shape of the mold cavity is at least partly modified at the point where it is desired to modify the physical characteristics of the molding during production. After the synthetic material is injected into the mold and hot expanded to fill the mold, the mold cavity is expanded at the point where the physical characteristics are to be modified and the molding is allowed to expand in a complementary manner in order that the material completely fills the expanded cavity. Then there is a compression of the molding and the molding is cooled to fix its shape.
Claims10
A process for the production of an expanded synthetic material molding comprising:
- (a) expanding the synthetic material in a precisely shaped cavity of a hot mold,
- (b) modifying the mechanical properties of the molding during production by enlarging the size of the cavity, expanding the material into the enlarged cavity until it occupies the enlarged cavity,
- (c) then compressing at least a part of the molding of step (b) to attain the final shape, and
- (d) stabilizing the final shape.
Dependencies are inferred from the claim text.