Manufacture of unidirectional fibre reinforced thermoplastics

Details Manufacture of unidirectional fibre reinforced thermoplastics Manufacture of unidirectional fibre reinforced thermoplastics

B - Operations, Transporting

29

C

B29C 70/14 (2006.01) B29B 15/12 (2006.01) C08J 5/04 (2006.01)

Patent

CA 2255987

The method for the manufacture of unidirectionally fibre reinforced thermoplastic bands (1) comprises a pressure impregnation of a fibre strand (1') in a bath (3) with a dispersion (22) of thermoplastic particles. Heat treatments (5, 6) for the drying of the strand (1") and a melting on of the particles taken up by the strand follow the pressure impregnation. The strand is drawn through the bath at a predetermined draw-off speed (v) about a plurality of deflection elements (4). The dispersion (22) of the bath is largely held in a stationary state, namely through the supply of an infeed dispersion (21) with a first particle concentration (c1) and through an initial setting of a second particle concentration (c2) in the bath: The infeed dispersion is fed in continuously or periodically, with the first particle concentration being held constant. A corresponding feeding in of a dispersion of higher particle concentrations as well as an additional amount of dispersing medium (210) is possible. The second particle concentration is set to a value which remains constant through an automatic self-setting alone. In this the two named concentrations (c1, c2) depend in an empirically determinable manner on a thermoplastic content (.theta.) of the band (1) to be achieved and on the draw-off speed (v).

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