Bleaching winches

Additives (g/1) Cistern Jig Winch or jet Package machine J-box conveyor Cold bleach... 

Vi scose/cotton blends can be bleached either by batch method on j ig and winch or by a continuous process using J-Box [150]. Bleaching is done on a winch with sodium hypochlorite (2 g/1 available chlorine) adjusted to pH 10-11 with sodium carbonate, for 1 h at 25°C, or alternatively, with 5 g/1 sodium chlorite adjusted to pH 4 with acetic acid for 30 min at 80°C. Alternatively, the bleaching treatment may follow with alkaline hydrogen peroxide at 85 C. 

When bleaching cotton yarn in a package machine or a winch, better results are often obtained with a 0-6 per cent (w/w) liquor made up according to the following recipe ... 

Sodium chlorite, because of its quick action and ability to bleach cotton which has not been caustic boiled, is well suited for continuous processes. It is used to an increasing extent for bleaching knitted fabrics, and it is claimed that there is substantial economy in the consumption of chlorite, especially in comparison with treatment in a winch. Man-mad fibres require quantities of about 0-15 to 0-2 per cent of sodium chlorite on the weight of the goods. With regard to cotton there appears to be little information, but it is probable that between 1 and 1-5 per cent of sodium chlorite is required. It is also necessary to add an activator to bring the/>H to between 3-5 and 4 either before or during the dwell period in the J box. 

Uses Detergent, washing agent, cleaning agent for all kinds of fibers, esp. underliquor bleach on continuous jets, continuous winch becks, etc. 

Uses Wetting agent, detergent, stabilizer for peroxide bleaching, esp. in winch machines... 

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