Patent ID: 6696011
Filing Date: 2004-02-24
Classification: B29B,B29C,B29K,B29L,E04C,Y10T

Abstract:
A method of forming a plastic product, comprising the steps of:extruding a plastic structural body having one or more cavities from a manifold of an extrusion head while expanding the structural body by injecting hot air into the cavities of said structural body; continuously feeding the structural body to a mold-forming unit to seat the structural body in the mold-forming unit, and perforating a plurality of holes on the sidewall of the structural body using a plurality of perforating and injecting units installed at the mold-forming unit; blowing the structural body by injecting hot air into the structural body and/or injection-molding the structural body by injecting a melted plastic material to the structural body at the mold-forming unit, thus producing a desired plastic product having one or more sealed cavities inside its completely sealed and continuous sidewall; and installing a rib thickness adjusting unit at the manifold of the extrusion head for forming a rib with a communication hole inside the structural body when the structural body is extruded from the manifold.