Patent ID: 6251318
Filing Date: 2001-06-26
Classification: B29C,B29K

Abstract:
A method for manufacturing biodegradable products with a blown, foam structure, wherein a mass including natural polymers is passed under pressure into or through a mold and the mass is heated in the mold in a manner such as to give rise to at least cross-linking of natural polymers to form a dense outside layer of a relatively thin rigid skin having closed, small cells, and a relatively thick foam inside core with open, larger cells, wherein the mass, prior to the introduction into the mold, is kept at a temperature whereby ungelatinized natural polymers in the mass are not gelatinized prior to introduction of the mass into the mold, whereby the mass which is below the gelatinization temperature is brought in the mold to at least the baking temperature to bake the product in the mold and form said relatively rigid skin, and wherein a relatively hard biodegradable product is formed with a blown, foam structure.