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Pushtrusion for extrusion.

The Pushtrusion DLFT process from Woodshed Technologies, Winona, Minn., originally developed for in-line compounding and injection molding of long-glass thermoplastics, is being applied to extrusion for the first time. PlastiComp Inc., also in Winona, is licensed to market and build Pushtrusion equipment. PlastiComp is building the first extrusion version for GaMra Composites Inc., Baldwin, Wis. It will be delivered in four months to make structural composite profiles.

In Pushtrusion, continuous glass fibers are pulled off a reel and through a cylinder in which they are wetted out with molten polymer under high pressure. Impregnated fibers are then chopped by a strand cutter and dropped into the melt stream in the second stage of a two-stage single-screw extruder. The process will be used to make PVC and PP composite profiles with loadings of up to 50% glass. It could even be used to add long glass to-wood-filled composites to increase strength. PlastiComp: (507) 454-4334,; GaMra: (715) 684-7905,

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Title Annotation:Extrusion
Publication:Plastics Technology
Date:Apr 1, 2004
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