Patent ID: 7422711

Claim:
A method of forming an extrusion comprising: passing a first plastic material through a first channel, a second channel and a third channel in a die; passing a second plastic material through the second channel in said die; and passing a third plastic material through the third channel in said die; wherein each of said plastic materials is introduced into said die in a flowable state, wherein said first plastic material when passed through said first, second and third channels forms a core of said extrusion, wherein said second channel abuts said first channel, wherein an outer surface of said first channel is greater in dimension than an inner surface of said second channel forming a recess surrounding said first channel, and wherein said second material is passed through said recess into contact with said first material such that said recess acts as a metering gap to cause said second material to bond with and surround said first material as said materials pass through the die.