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    • 3. 发明专利
    • PROCESS FOR PRODUCING PLY YARN FROM THREADS OF FIBRES
    • GB1363904A
    • 1974-08-21
    • GB5027571
    • 1971-10-28
    • INTER TEXTILES EUROP
    • D02G1/02D02G3/32D02G3/28D02G3/04
    • 1363904 Elastic ply yarns INTER TEXTILES EUROPEEN 28 Oct 1971 [29 Oct 1970] 50275/71 Headings D1F and D1W A process for producing voluminous balanced elastic ply yarns from threads of discontinuous man-made fibres or a mixture of non- keratinous natural fibres e.g. linen, cotton, hemp or jute, and discontinuous man-made fibres comprises the steps: a) individually twisting at least two of the above threads in a first direction until each thread has a twist factor α, of 95-110; b) thermally setting the twist in the threads; c) twisting the thermoset threads thus obtained in the opposite direction to form a ply yarn having an initial twist factor α 2 of 110-125; d) thermally setting the initial twist of the ply yarn; e) untwisting the ply yarn by twisting in the first direction and overtwisting the ply yarn in said direction until it has a twist factor α 3 of 275-290 and heat treating it in this temporarily overtwisted state; f) returning it to its initial twist, and g) sizing it in a relaxed state before winding it onto a support. The twist factor α is defined by the relationship T=α#Nm where T is the number of turns per metre, and Nm is the metric count of the yarn. α 1 is preferably between 100 and 105, α 2 between 115 and 120 and α 3 between 280 and 285. The overtwisting of the ply yarn is preferably accompanied by an elongation between 0.1 and 2%. The thermosetting is carried out at a temperature in the neighbourhood of the softening point of the man-made fibre. The overtwisting of the ply yarn and the return to its initial twist is carried out using a false-twist spindle and is preferably under conditions which satisfy the following formula: take in formula: in which V b is the speed of the false twist spindle in rpm, α 3 #Nm is the temporary twist in turns per metre, T is the initial twist of the ply yarn in turns per metre, and C is the length in centimetres of the heating element transversed by the twist. The ply yarn is preferably returned to its initial twist with a shrinkage between 16 and 35%. The thermosetting of the twist in the single threads and the initial twist in the ply yarn is carried out at a pressure lower than 70cm of mercury and at a temperature of 80-100‹C for 15-30 minutes.