Patent GB-148336-A (GB)
Title: An improved device for bleaching textile fibres and fabrics, tissues and the like
IPC: D06B5/00
Filed: 1920-07-09
Abstract: 148,336. De Eibergsche Stoombleekerij voorheen G. J. ten Cate & Zonen, and Mohr, R. Sept. 13, 1916, [Convention date]. Bleaching, processes and materials for; circulating of passing fluids through materials.-Textile material within a bleaching-vessel 1 is bleached by first filling the vessel 1 with the bleaching-agent &c. from one or the other of tanks 6, 7, 8 by means of a circulating-pump 4 and various pipes, then closing the vessel by means of a stop-cock 56, and next developing a pressure of from 2 to 3 atmospheres and maintaining this pressure whilst the bleaching-liquid is circulated through the vessel 1, an expansion vessel 3, and a combined saturating and filtering vessel 2, these vessels communicating with one another by means of various pipes, as shown, next pumping away air from the expansion vessel 3 by means of an air pump 5 and pipes 47, 51, to produce a vacuum therein, and then pumping the bleaching-gases developed in the vessel 3 from this vessel into the saturating-vessel 2 by means of the pipe 4 and a pipe 49, so that the bleaching-liquid present in the vessel 2 is re-saturated with bleaching-gases, parts 71, 72 of the saturating- vessel 2 being furnished with filtering-material (wood wool), so as to filter the bleaching-liquid, whilst it is being circulated through the various 'vessels. The various pipes are provided with stop-cocks, as shown, and their manner of manipulation to introduce and circulate the bleaching- liquid &c. is described, and also the manner in which the liquid is re-discharged into the tanks, a vacuum being produced in the bleaching-vessel, which prevents the formation of oxycellulose and stains. Water may be introduced into the vessels through a pipe 43 for washing, or weak acid from the tank 7. The tanks 6, 8 may contain material for chlorine and oxygen bleaching respectively, and the material may be treated with either or both. During the " oxygen " treatment, soap may be added and steam for heating to about 60‹ C. may be introduced through a valve 54. Reference is made to a chlorine treatment under pressure and in vacuo. A discharge pipe 27 is provided. The pressure, indicated by manometers 57, 58, 59, is regulated by a stopcock 39. The saturating-chamber 2 comprises a lower and an upper part separated by a sieve 73, the lower part being divided into chambers by a vertical partition 64, these chambers oommunicating with one another by means of the upper part and being further divided by sieves &c. 67, 68, 69, into sub-chambers rendered accessible by manholes. The upper part communicates with the vessal 3 by means of a discharging-pipe 76 furnished with a float valve 74. Unabsorbed gases in the saturating-vessel return to the top thereof, liquid being forced from the saturating- vessel to the bleaching-vessel, unabsorbed gas ultimately escaping back to the top of the expansion vessel 3 through the pipe 76. The bleaching- vessel has removable perforated false-bottoms, comprising gratings of bars lens-shaped in section, to receive the material to be bleached. Gauge glasses are provided as shown. Reference is made to the treatment of curtains, lace, fibres. yarns, fabrics, white and dved goods, linen, and cotton.