Patent ID: 8043548
Filing Date: 2011-10-25
Classification: B29C,B29K,B29L,F16L

Abstract:
1. A method of making a tubular pipe body, comprising introducing a flowable material in an outer mold, disposing an inner collapsible mold on a plunger piston, said inner collapsible mold having a smaller transverse dimension than the outer mold, relatively moving the inner collapsible mold on the plunger piston and the outer mold with the material therein to cause the material to flow into a space between the outer mold and the inner mold such that it can form a tubular pipe body in said space between the outer mold and the inner collapsible mold, removing the plunger piston to leave the inner collapsible mold in place, and forming the tubular pipe body from the material in said space.