Process for making expanded polymeric materials

Abstract

The present invention has as its object a process for making a product comprising a polymeric material expanded by using one or more blowing agents characterized in that said process comprises the following steps: ⋅ to make a preform of polymeric material with a filling degree equal to or less than 90% and thin structures having a thickness equal to or less than 3 mm, preferably equal to or less than 2 mm, ⋅ to make a mold including a cavity, said cavity having the shape of the desired product and dimensions equal to or greater than the overall volume of said preform, ⋅ to insert the preform into said cavity of the mold, ⋅ to solubilize under pressure one or more blowing agents in the preform within said mold cavity, ⋅ to release the pressure, and ⋅ to remove the product comprising the expanded polymeric material from the mold.

Dependencies are inferred from the claim text.