Patent ID: 7303706
Filing Date: 2007-12-04
Classification: B29C

Abstract:
1. A process for manufacturing of polymeric trim parts by making use of physical blowing agents comprising the steps of, melting polymer material in a plasticizing cylinder, supplying the blowing agent to a pressure chamber of a statical mixing device, loading said pressure chamber which is circumferentially enclosing a unitary hollow cylinder having a porous cylinder wall with the blowing agent and pressing it through the porous hollow cylinder wall, whereby the polymer melt flowing past the porous hollow cylinder wall is charged with blowing agent such that the polymer melt is revolved repeatedly by protrusions extending interiorly of the hollow cylinder at least partially into the polymer melt, and transporting a mixture of blowing agent and polymer melt to a mold whereby the polymer melt undergoes a foaming process due to the expansion of the blowing agent dissolved in the polymer melt or after having entered the mold.