Patent ID: 7393492

Claim:
A method of producing a bio-degradable foamed product, with a smooth surface finish and density of about 35 to 100 kg/m 3 the method comprising preparing a bio-degradable raw material ready for foaming by process of heat and shear; placing the material into a closed mold to form a moldable assembly; microwaving at least one said moldable assembly to form a bio-degradable foamed product; wherein said mold comprises at least one of: microwave interactive material disposed on at least one internal surface of a cavity in said mold; microwave interactive material impregnated into the mold material itself; and combinations thereof such as to enable the internal surface of the mold to be heated substantially uniformly by microwave radiation to a temperature that is greater than a melt temperature of said material being foamed in said mold and high enough to prevent vapour condensation on the surface of the foamed article.