GB1288975A - - Google Patents

Abstract

1288975 Break spun yarns TORAY INDUSTRIES Inc 29 Sept 1969 [30 Sept 1968 7 Oct 1968 11 Oct 1968 21 Oct 1968 22 Oct 1968] 47706/69 Headings DID and DIW A method of manufacturing a yarn on the break spinning system is characterised in that a sliver 1 made up of staple fibres having a cross-sectional profile characteristic of 0.3 or less is transported into a rotary spinning chamber 4 in a liberated condition by entraining the sliver in a pneumatic flow caused by a positive supply of compressed air, liberated fibres are rebundled and twisted in a form of a spun yarn having a twist constant in the range 3.5 to 5, and the material sliver satisfies the relationship: wherein: FA is the pneumatic resisting force in mg/mm; FD is the draw-out resisting force in mg; N is the number of fibres in a transverse cross-section of the sliver; and L is the average fibre length in mm. In a preferred example, the twist possessed by outer layered fibres is different from that possessed by inner layered fibres; the unevenness index does not exceed 10, and the value of the variation coefficient of stretching tension does not exceed 4. All parameters are defined, and their determination described, in the Specification. The yarn is said to have increased moisture retainment. The break spinning apparatus comprises a pair of feed rolls 2a, 2b, a pneumatic feeding device 3, a delivery tube 6 and a rotating spinning chamber 4. The spun yarn 8 is taken out via the tube 7 by a pair of rolls 11a, 11b and wound on package 9.