Patent GB-385985-A (GB)
Title: Improvements in the manufacture of treatment of yarns containing artificial filaments
IPC: D01F2/28
Filed: 1931-06-04
Abstract: <PICT:0385985/IV/1> <PICT:0385985/IV/2> <PICT:0385985/IV/3> <PICT:0385985/IV/4> <PICT:0385985/IV/5> Cellulose acetate or other cellulose derivative yarn which is in a condition liable to lead to contraction, is wound on to a bobbin or other package support rotated at a peripheral speed slightly lower than the rate of delivery whereby the yarn is slackly wound and any tendency towards straining due to contraction is reduced. The yarn may be slackly wound continuously with twisting, or stretching, or with its production. The yarn may be wound in hanks continuously with stretching and subsequently rewound slackly.  If desired, liquids may be applied to the yarn prior to winding in order to assist contraction, and the yarn may be dried after the liquid treatment and prior to the slack winding.  A drum winding device where the speed of the drum determines the rate of winding on a package whose surface is pressed against the drum may be employed and the speed of the drum may be adjusted by a variable friction drive to be slightly less than that of the feed roller.  The yarn may be crosswound.  The slack winding may follow a sizing, or other treatment forming part of a process for the production of crape yarns.  As shown in Fig. 1, cellulose acetate threads pass from a spinning cell 11, round a roller 12, through a stationary and a traversing thread guide to a spool 15 which is rotated by the drum 16 at a slightly slower speed than the roller 12 so as to obtain slack winding.  A similar arrangement of the feed roller and winding spool may be used for slackly rewinding cellulose acetate yarn from a hank which has undergone stretching.  As shown in Fig. 2, the thread 10 is taken from a bobbin 19, passed round a roller 20, moistened with aqueous acetone or with another swelling agent by a wick 21, and stretched by a roller 22 rotating at a higher speed than roller 20; it then passes to a bobbin 15 on which it is slackly wound.  As shown in Fig. 3, threads in warp form, are taken from a beam 26, passed round rollers 27, 28, stretched by rollers 29, 30 and then wound on a beam 32 rotating at a somewhat slower peripheral speed than the roller 29 so as to obtain slack winding. Washing liquid is applied to the threads while passing round roller 29 and a steam heated drying plate 33 is placed between roller 29 and the beam 32.  As shown in Fig. 4 the thread 39 is drawn with twisting from a bobbin 37, round a feed roller 42, and wound on a bobbin 15 rotated at a slightly slower speed than the roller 42.  The thread may be moistened by liquid contained in a trough 43.  Fig. 5 shows a winding bobbin 15 mounted freely on a spindle 50 which is capable of rising as the bobbin fills.  The drum 16 is mounted on a shaft which carries a friction wheel 48 which is in contact with a disc 47 driven by a friction wheel 46.  The speed of the drum 16 may be altered by shifting the axis of the disc 47.  In order to obtain shrinkage before winding, the threads may be moistened while passing round a roller and then dried by passing through a heated tube situated between the roller and the winding device. If desired, bobbins with resilient surfaces may be employed. Specifications 277,089, [Class 2 (ii), Cellulose &c.], 304,806, [Class 120 (ii), Spinning, twisting &c.], 323,790, 336,217, [both in Class 2 (ii), Cellulose &c.], 348,589, 352,000, 352,451, 356,233, 357,084, 357,169, 357,576; 357,577, [Group IX], 362,523, 365,041; 367,780, [Group IX)], 370,040, 370,430, 371,910, 378,074, 378,910, 379,285; and 386,344, [Group IX], are referred to.