Patent ID: 7661945
Filing Date: 2010-02-16
Classification: B29C,B29L

Abstract:
1. An extruding system for forming a cylindrical extrusion having a pattern of multiple colors, comprising: multiple extruders, each feeding plastic of one of said multiple colors; a rotatable extruder core comprising a plurality of cylindrical spools equal in number to the extruders, stacked one above the other about a common central axis, each spool having a plurality of circumferentially spaced passages extending from the outer perimeter of the core to a common interior output passage of the core, the circumferentially spaced passages of the spools being interleaved, each of the extruders feeding plastic to the outer perimeter of one of the spools so that the plastic flows through the spaced passages of that spool to the common interior output passage; and a drive rotating the stack of spools about said central axis to produce an output flow of multiple colors displaced laterally along the length of the flow.