Patent ID: 9011131
Filing Date: 2015-04-21
Classification: B29B,B29C

Abstract:
1. An extruder screw adapted for receipt in a barrel of an extruder comprising: a core extending from a sealing end to a nose cone end; at least one flight extending radially from said core in a helical pattern, wherein flights adjacent one another form channels therebetween; and a plurality of elongate lugs extending radially from said core and are disposed in said channels, wherein the plurality of elongate lugs comprise a shape comprising opposed ends that are connected by opposed sides, wherein the ends and the sides are terminated with a crown that forms a top of the elongate lugs, and wherein a surface area at the top of the elongate lugs is less than a surface area at the bottom of the elongate lugs, wherein said core has a center line and each said elongate lug has a lug angle with respect to said center line, wherein the lug angles are progressively increased from the sealing end to the nose cone end, wherein a flight ridge is provided by each said flight, wherein each said lug has a crown which has an offset dimension from said flight ridge, and wherein said offset dimensions are progressively decreased from said sealing end to said nose cone end.