PROCESS FOR THE PRODUCTION OF STRETCH-TEXTURED YARNS WITH PROPERTIES

摘要

1513142 False twist texturing BAYER AG 6 May 1975 [10 May 1974] 18949/75 Headings DID and D1F In a process for the simultaneous stretch texturing of synthetic, at least partly thermoplastic, filament or yarn, a filament or yarn is passed through an internal friction falsetwister, and the ratio S 2 /S 1 between the tractive forces S 1 acting on the filament or yarn before the false-twister, and S 2 , acting on the filament or yarn after the false-twister, is controlled within the range of 1.0 to 1.4 by adjusting the ratio between the rotational speed of the false twister and the rate of travel of the filament or yarn, and wherein the twisting of the filament or yarn is from 5 to 50% higher than the level of twisting calculated by the Heberlein formula for a filament or yarn of the same denier in a conventional false-twist texturing process using a spindle. The Heberlein formula is defined as D=306,000 divided by (67+T dtex)+ 800, where D=the yarn twist per metre, and T is the yarn denier. As shown, Fig. 2, the filaments are passed through successive twist bushes whose inlets 1 have a higher coefficient of friction with the yarn than the outlets 2. The filaments may be passed twice through the first bush, Fig. 2. Again, Fig. 3, the filaments may be held clear of the bush outlets by guides 6. The filaments, Fig. 5, are drawn between rollers 8 and 12 while being heated at 9 and false twisted at 10, 11.