GB1384728A - Separation twist crimping of thermoplastic filaments or yarns - Google Patents

Abstract

1384728 Separation twist crimping; false twisters BARMAG BARMER MASGHINENFABRIK AG 26 July 1972 [27 July 1971] 34879/72 Headings D1D and D1F Two or more thermoplastic filaments or yarns 4.1, 4.2 are continuously crimped by twisting or coiling them together to form a twisted strand 3, setting the strand with heater 7 and separating the filaments, whereby the twisted strand is driven by a friction drive 12 between the region in which heat setting occurs and the point of separation of the filaments. The friction drive may surfice to completely separate the filaments, in which case separation takes place within the friction drive means. Alternatively separation may be assisted by tension applied to the separated filaments. A cooling fan (8, Fig. 1, not shown) may be interposed between heater 7 and friction drive 12. As shown the friction drive comprises 2 friction wheels 13.1, 13.2; alternatively three wheels or groups of wheels may be used with the three axes arranged in an isosceles triangle (Fig. 10, not shown). Preferably the twisted strand 3 is driven at a speed which decreases towards the point of separation 5. This may be accomplished by a pair of conical or frusto conical driving means (14.1, 14.2, Fig. 6, not shown), by a plurality of driving wheels (15, Fig. 7, not shown) coaxially mounted upon a single spindle, the diameter of the wheels decreasing towards the separating point, or by a rotating conical sleeve (16, Fig. 8, not shown) which rotates at an angle to the thread. Guide means may be provided for each separated thread to minimise displacement of the point of separation.