Patent GB-739178-A (GB)
Title: A process and equipment for the continuous treating of yarns
Inventor: SVERINI GOFFREDO
IPC: D01D10/04
Filed: 1953-01-28
Abstract: <PICT:0739178/IV (a)/1> <PICT:0739178/IV (a)/2> A plurality of textile yarns, particularly artificial filament yarns made from viscose, cellulose acetate, casein, or synthetic linear polymers, is subjected to a common treatment by causing the yarns to traverse intercalated helical paths, one path for each yarn, all of the paths including a portion in a common cylindrical surface where the treatment is applied and all other portions of the paths differing in form or position whereby all the yarns are mutually separated when out of the treatment area. The apparatus used comprises a main or processing roller whereon at least a substantial portion of the treatment, or a succession of treatments, is effected, and a plurality of feed or return rollers, each individual yarn having its own feed roller, and means for causing the yarns to traverse the length of the main roller by guiding them through a series of intercalated helical paths extending between the main roller and the respective feed rollers.  As shown in Figs. 3 and 4, the yarns 21A-21D are traversed in intercalated helical paths along a processing roller 20.  Feed rollers 26A-26D are provided, one for each yarn which passes from its respective feed roller to the processing roller and back again in a large number of turns.  The feed rollers are made of smaller diameter than the processing roller and they are arranged with their axes oblique or askew in respect of that of the processing roller but they may be substantially parallel to one another.  The processing roller is subdivided by means of flanges 24 so that different liquids applied to the yarns by means of pipes 22 are prevented from intermingling.  Guides 25 are provided in order to allow the yarns to pass over the flanges from one treatment zone to another.  The roller 20 is inclined in a direction opposite to that of the general progression of the yarn, whereby the film of liquid formed by the treatment solution on the surface of each section of the roller will flow in counter-direction to the yarns.  A trough 23 is provided to collect the liquids which flow off the roller.  The yarns may be subjected to washing and chemical treatments or to heating or cooling treatments.  If desired, heating or cooling fluids may be passed through the interior of the roller 20.  In the production of viscose rayon, the treatments may include fixing, desulphurizing, bleaching, finishing and drying.  The roller may be tapered so that the yarns are submitted to stretching or shrinking.  In starting the operation, yarn 21D is first wound around roller 20 and feed roller 26D until it reaches the first flange 24 where it forms a ring made up of many turns.  Then the second yarn 21C is started and allowed to reach the flange 24. The other yarns are similarly started in succession.  All the rings of yarn are then caused to pass over the flange at the same time, whereupon the individual yarns disengage from one another as they pass along the roller to the next flange to form further rings.  Similarly the yarns are passed from one flange to the next until the yarns reach the delivery end of the roller.  Each yarn is then passed to its own collecting device.