B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
154/70.04
B29C 47/02 (2006.01)
Patent
CA 1280344
PROCESS FOR PREPARING TAPES FROM THERMOPLASTIC POLYMERS AND CARBON FIBERS ABSTRACT OF DISCLOSURE The instant invention involves a process for use in preparing tapes or rovings, which are formed from a thermoplastic material used to impregnate longitudinally extended bundles of carbon fibers. The process involves the steps of (a) gas spread- ing a tow of carbon fibers; (b) feeding the spread tow into a crosshead die; (c) impregnating the tow in the die with a thermo- plastic polymer; (d) withdrawing the impregnated tow from the die; and (e) gas cooling the impregnated tow with a jet of air. The crosshead die useful in the instant invention includes a horizontally extended, carbon fiber bundle inlet channel, means for providing melted polymer under pressure to the die, means for dividing the polymeric material flowing into the die into an upper flow channel and a lower flow channel disposed above and below the moving carbon fiber bundle, means for apply- ing the thermoplastic material from both the upper and lower channels to the fiber bundle, and means for withdrawing the resulting tape from the die.
508645
Chung Tai-Shung
Furst Howard
Gurion Zev
Mcmahon Paul E.
Orwoll Richard D.
Basf Aktiengesellschaft
Smart & Biggar
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