Patent GB-823012-A (GB)
Title: Method of and apparatus for continuously producing and after-treating artificial silk yarns in the form of a travelling sheet of closely spaced parallel threads
IPC: D01D10/04
Filed: 1958-01-31
Abstract: Artificial yarns, more particularly viscose rayon yarns, are wet-spun and continuously treated in the form of a travelling sheet of closely spaced parallel yarns having a width which is less than the length of each spinning machine by a method in which the travelling sheets produced by two or more spinning machines, which have their longitudinal axes parallel to one another and are located in a file one behind the other at the same elevational level, are first caused to travel vertically upwards, each sheet thereafter passing over a deflecting roller located substantially vertically above the corresponding spinning machine and parallel with the longitudinal axis thereof, whereupon the sheets from all the machines in a file are caused to travel to a common feed roller which is parallel to the deflecting rollers and located in front of the front deflecting roller in the direction of travel of the yarn in such a manner that the travelling sheets from the different deflecting rollers are run on to the <PICT:0823012/IV (a)/1> <PICT:0823012/IV (a)/2> <PICT:0823012/IV (a)/3> feed roller at different angles to the horizontal, the angle being greatest in the case of the sheet from the deflecting roller nearest the feed roller and vice versa, and then form a composite sheet of lesser width than the length of the spinning machines, to be conducted in this form through the consecutive after-treating stages.  As shown, four viscose spinning machines A-D are grouped in pairs in two rows at the same level. Arranged in the spinning bath 4, 41 of each machine are two parallel rows of spinnerets 3, 31.  A common drive means 5, 51 is provided between each pair of machines.  Located on an elevated working platform 8 with elongated openings 9, 91 above each spinning machine is a driven deflecting roller 2, 21 equal in length to the length of the spinning bath.  All the deflecting rollers are at the same level. At a higher level are arranged driven feed rollers 11, 111, one associated with each file of spinning machines C-A and D-B respectively, the length of the feed rollers being less than that of the deflecting rollers 2, 21, according to the desired degree of reduction in the spacing between the individual yarns in the composite sheet formed on the feed roller, the composite sheet thereafter being conducted to the consecutive after-treating stations.  Associated with and preceding each feed roller 11, 111 respectively is a guide means 10, 101 in the form of a reed or notched bar having the same length as the feed rollers.  Associated with each spinning machine is a threading-up roller 1 which can be vertically raised through the openings 9, 91 in the working platform 8 from a position 1u or 11u immediately above the spinning bath to a position 1o or 11o near the deflecting roller 2, 21 or conversely. Each threading up roller is driven continuously, irrespective of its position in relation to its associated spinning machine, by a motor of infinitely variable speed either directly or through speed-reduction gearing.  In operation, the sheet of yarns from the spinning machine B is divided into two narrower sheets a1, b1 which are drawn on to the end portions of the feed roller 111, leaving a gap between them on the roller.  The sheet C1 from the machine D is drawn on to this central portion of the roller 111 between the divided sheets from the machine B to form a composite sheet along the whole length of the roller 111. The sheets of yarns from the machines A and C are similarly assembled on the feed roller 11.  Threading up and the initial formation of the individual travelling sheet of yarns at each machine is effected by first collecting the freshly spun yarns from each machine on the associated threading up roller 1 while the latter is in its lowermost position 1u and 11u and threading them through yarn guides 12, 121, of which one is provided above the spinning bath for each pair of yarns extruded from opposite spinnerets.  The threading-up roller is then raised to the position 1o, 11o somewhat above the deflecting roller 2, 21, the yarns being then taken off the threading-up roller and placed side by side on the deflecting roller 2, 21, which rotates at the same peripheral speed as the threading-up roller but in the opposite direction.  The apparatus enables sheets of closely spaced parallel yarns of moderate width to be produced without the use of excessively long spinning machines.