Patent GB-696595-A (GB)
Title: A machine for the continuous liquid treatment of yarns, suitable for the mercerizing of cotton yarns
Inventor: LUTHER WILLIAM FRANCIS
IPC: D06B7/04
Filed: 1951-01-10
Abstract: 696,595. Coating yarns. DIXIE MERCERIZING CO. Jan. 10, 1951. No. 718/51. Class 140. A yarn is continuously treated with liquid, e.g. mercerizing solution followed by washing liquid, while passing around a pair of rollers 23, 24, Fig. 5, with their axes slightly askew as a series of loops, from one end of the rollers to the other, one of the rollers being driven so that the yarn is drawn on to the rollers from a yarn supply, passes from one roller to the other as it progresses axially of the rollers, and is delivered from the rollers, the liquid or liquids being applied to the yarn during its passage between the rollers. As shown, the yarn is drawn from a package 15, Fig. 2, through guides 16, 18, and a tension guide 21 to one end of roller 23, caustic soda solution is applied by a roller 34 dipping in trough 41 to the lower run of the first few loops of the yarn as it passes from roller 23 to roller 24, and wash water is applied to the lower run of loops of the yarn towards the exit end of the rollers by a roller 43 dipping in trough 44 to which fresh wash water is constantly delivered. A squeeze or wringer roller 53, Fig. 5, bears against all the yarn turns on roller 24, the excess caustic soda solution so removed being returned to trough 41, and all or some of the wash water being caught in a pan 61 for subsequent concentration and re-use. A shield 63 may be provided to prevent liquid from being carried to the take-off end of roller 24. The rollers 23 and 24 are of gradually enlarging diameter towards the yarn-discharging end in order to stretch the yarn. The yarn leaving the yarn-discharging end of rollers 23, 24 passes through a guide 64, over a traverse drum 66, and is wound on a frictionally driven spool 74 which may be perforated to facilitate further washing &c. operations. A bar 77, Fig. 5, adjustable up or down at both ends, may press upon the upper runs of the loops to crowd them together, and guide arms 83, 84, Fig. 2, control the first and last turns. Rollers 34 and 43 turn relatively slowly. A second form of apparatus is described having as additional features (a) the mercerized and washed yarn is passed to a second, similar pair of rollers with axes slightly askew on which the yarn is dried, the rollers being electrically heated under thermostatic control, (b) the rollers on which the yarn is mercerized are covered with a hood provided with doors, (c) the roller' which applies the caustic soda solution and the wash roller are on different shafts rotated in opposite directions so that the thread-contacting surface of the caustic-applying roller moves more slowly than and in the opposite direction to the thread whilst the thread-contacting surface of the wash roller moves more slowly than and in the same direction as the thread, (d) the wash roller is subdivided into sections, the liquid recovered from the yarn treated by the first section being concentrated for. re-use, and that recovered from later stretches of the yarn being discarded, (e) stop motions are provided to stop the machine in case of thread breakage, (f) the yarn from the drying cylinders is twisted on a spindle.