Procedure for the manufacture of a foamed plastic product

Details Procedure for the manufacture of a foamed plastic product Procedure for the manufacture of a foamed plastic product

B - Operations, Transporting

29

C

B29C 44/20 (2006.01) B29C 44/34 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2197499

Procedure for the manufacture of a foamed plastic product, in which procedure a filmlike plastic product (1) is perfoamed e.g. by using foaming agents added into the manufacturing process, in such a way that lamellar discontinuities (2), e.g. prefoamed bubbles, are created in the product (1). The product (1) is pressurized with a desired gas, such as nitrogen or air, under positive pressure, causing the gas to diffuse into the product. The product (1) is then inflated by sujecting it to a heat treatment under reduced pressure during which the product is heated at a temperature below its melting point.

Procédé de fabrication d'un produit en plastique expansé, selon lequel un produit (1) plastique en feuille est préexpansé à l'aide d'agents gonflants ajoutés pendant le processus de fabrication, de telle manière que des discontinuités lamellaires (2), par ex. des bulles préformées, soient créées dans le produit. Ledit produit (1) est mis sous pression avec un gaz désiré, tel que de l'azote ou de l'air, sous pression positive, ce qui pousse ledit gaz à se propager dans le produit. Ledit produit est ensuite dilaté en subissant un traitement thermique à une pression réduite, pendant lequel le produit est chauffé à une température inférieure à son point de fusion.

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