In the past two years, KraussMaffei Berstorff, Florence, Ky., has built a handful of large crammer-fed twinscrew extruders for reprocessing PET or nylon fiber or polyolefin film scrap at up to 3000 lb/hr. Crammer feeding is typically applied to single-screw extruders, and this may be its only commercial twin-screw use. Twin-screws reportedly provide better feeding and melting of slippery materials like high-temperature fibers or film fl akes, as well as easier venting of moisture. The vertical crammer-auger has motor torque control and level gauges in order to pack a uniform density of material into the feed throat. The fiber or film scrap is combined with 30% pelletized material or reinforced with chopped glass fibers. Tel: (859) 2830200 . www.berstorff.com
7095 Industrial Rd. P.O. Box 6270
Florence, KY 41022-6270
Phone (859) 283-0200 Fax (859) 283-0290
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