Patent ID: 6129873
Filing Date: 2000-10-10
Classification: B29C

Abstract:
In a process for extruding a solid thermoplastic resin in a single screw extruder wherein a barrel of a single screw extruder has a channel and a screw for conveying the resin down the barrel, a feed section and a first melt seal located after the feed section, the improvement which comprises the steps of supplying a solid condensation polymer through a feeding device into the feed section and venting a vent area of moisture volatilized from the condensation polymer during the transition of the polymer from a solid to a melt through a vent positioned behind the feeding device in the feed section, wherein the vent area is defined by an unfilled area within the channel of the barrel between the rear vent and the first melt seal and wherein a portion of the screw between the rear vent and the feeding device has an increased pitch.