GB696486A - Methods and apparatus for the liquid treatment of traveling yarn - Google Patents

Abstract

<PICT:0696486/IV (a)/1> <PICT:0696486/IV (a)/2> <PICT:0696486/IV (a)/3> <PICT:0696486/IV (a)/4> <PICT:0696486/IV (a)/5> <PICT:0696486/IV (a)/6> Artificial yarn, such as freshly-produced rayon from viscose, is subjected to liquid treatment while travelling in a helical path. Liquid is applied to the yarn in a direction substantially tangential to the helical turns of the yarn and the excess liquid is thrown off the yarn by centrifugal force. The apparatus employed comprises a rotatable yarn-storage, yarn-advancing device and at least one container for a body of liquid positioned adjacent the device, means for forming drops of the liquid in the container and for projecting the drops on to the turns of the yarn, and means for limiting the drops of the liquid applied to the yarn to those travelling approximately in a direction tangential to the rotating turns of yarn. The yarn may be treated with a succession of liquids which are applied in separate zones, mixing being prevented. As shown in Figs. 1, 2, 3, a yarn-storage, yarn-advancing reel 2 rotates so that spaced helical turns of yarn are advanced along it in axial direction. A trough 3 extends along the length of the reel and is positioned beneath it and at one side. The reel 2 is surrounded by cover 4. Transverse partitions 5 in trough 3 form compartments 6, 7, 8. Liquid enters at one end of each compartment through pipe 9 and flows to the other end to overflow pipe 10 which maintains the liquid at the desired level. A rotary cylindrical brush 12 is provided in each compartment for projecting drops of liquid on to the yarn. The brushes 12 are rotated in the same direction as reel 2. They are provided with finger-like members 14, preferably made of flexible resilient material such as rubber or a synthetic resin. Forms of the members 14 are shown in Figs. 6, 7, 8. The members 14 dip a short distance into the liquid. In compartment 7 a number of sub-compartments 16-19 are formed by partitions 15 so as to enable the yarn to be subjected to successive treatments by the same liquid, which is caused to flow in the opposite direction to that of the advancing turns of yarn. Flanges 27 on cover 4 are positioned in line with the partitions in the trough 3 so as to prevent mixing of the liquid from one zone to another. The device 2 is rotated at such high speed that excess of liquid applied to the yarn is thrown off by centrifugal force soon after application and is returned by gravity to the compartment from which it was projected. The brushes 12 are so disposed and operated that the drops of treating liquid are applied to the turns of yarn substantially tangentially.ALSO:Yarn, such as freshly produced rayon from viscose, is subjected to liquid treatment while travelling in a helical path. Liquid is applied to the yarn in a direction substantially tangential to the helical turns of the yarn and the excess liquid is thrown off the yarn by centrifugal force. The apparatus employed comprises a rotatable yarn-storage, yarn-advancing device and at least one container for a body of liquid positioned adjacent the device, means for forming drops of the liquid in the container and for projecting the drops on to the turns of the yarn, and means for limiting the drops of the liquid applied to the yarn to those travelling approximately in a direction tangential to the rotating turns of yarn. The yarn may be <PICT:0696486/IV (c)/1> <PICT:0696486/IV (c)/2> <PICT:0696486/IV (c)/3> <PICT:0696486/IV (c)/4> <PICT:0696486/IV (c)/5> <PICT:0696486/IV (c)/6> treated with a succession of liquid which are applied in separate zones, mixing being prevented. As shown in Figs. 1, 2, 3, a yarn-storage, yarn-advancing reel 2 rotates so that spaced helical turns of yarn are advanced along it in an axial direction. A trough 3 extends along the length of the reel and is positioned beneath it and at one side. The reel 2 is surrounded by cover 4. Transverse partitions 5 in trough 3 form compartments 6, 7, 8. Liquid enters at one end of each compartment through pipe 9 and flows to the other end to overflow pipe 10 which maintains the liquid at the desired level. A rotary cylindrical brush 12 is provided in each compartment for projecting drops of liquid on to the yarn. The brushes 12 are rotated in the same direction as reel 2. They are provided with finger-like members 14, preferably made of flexible resilient material such as rubber or a synthetic resin. Forms of the members 14 are shown in Figs. 6, 7, 8. The members 14 dip a short distance into the liquid. In compartment 7 a number of sub-compartments 16-19 are formed by partitions 15 so as to enable the yarn to be subjected to successive treatments by the same liquid, which is caused to flow in the opposite direction to that of the advancing turns of yarn. Flanges 27 on cover 4 are positioned in line with the partitions in the trough 3 so as to prevent mixing of the liquid from one zone to another. The device 2 is rotated at such high speed that excess of liquid applied to the yarn is thrown off by centrifugal force soon after application and is returned by gravity to the compartment from which it was projected. The brushes 12 are so disposed and operated that the drops of treating liquid are applied to the turns of yarn substantially tangentially.