Patent ID: 7390118
Filing Date: 2008-06-24
Classification: B29B,B29C

Abstract:
1. A single screw compounding extruder assembly comprising: a barrel including: a screw disposed within the screw passageway, the screw including: a drive assembly arranged adjacent a first end of the barrel with an operative portion coupled to the first end of the screw; and a static wiping element slidably arranged in a bore that is provided in the barrel sidewall within a low pressure stage adjacent said auxiliary port; a projecting portion of the static wiping element being arrangeable within the screw passageway and being configured to cooperate, in use, with an adjacent screw portion for the wiping thereof; a drive, with an operative portion connected to the static wiping element, for the positioning of the static wiping element, between an extended and a retracted position, synchronously with the rotation of the screw whereby the projecting portion of the static wiping element that functions within the screw passageway may be intermittently retracted into the bore, in use, to avoid interfering with a screw flight portion passing therebeneath; whereby the wiping of the screw portion improves melt conveyance through the low pressure extruder stage in the extruder barrel.