Patent Number: 6,254,369

Title: Extrusion die for forming a skin on reusable construction material for concrete forms

Abstract: Rectangular construction studs are provided with a plastic or polyethylene extrusion resin skin by extruding the plastic onto the manufactured core of the stud through a die which has been constructed to provide a substantially uniform rate of feed of extrusion materials throughout an entire flattened rectangular oblong enveloping prismatic and conforming cavity defined in the die which completely and prismatically circumscribes a rectangular core member, which is being disposed and translated through the die from a feed position in the die to its extrusion exit ports. The uniform volume feed rate is achieved through the use of a plurality of feeding risers communicating between a supply runner and an extrusion channel in the die. The enveloping prismatic and conforming cavity is primarily supplied extrusion material from primary risers located in opposing central portions of the flattened, oblong shape and is supplemented with the plurality of secondary risers opposing side portions of the enveloping prismatic and conforming cavity.

Inventors: Kelly; Daniel M. (Palm Desert, CA), Blaney; Roger A. (Yucaipa, CA), Risch; Richard S. (Redlands, CA)


International Classification: B29C 47/02 (20060101); B29C 47/20 (20060101); B29C 47/28 (20060101); B29C 047/12 ()

Expiration Date: 07/03/2018