. Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects . No. 52. Bleach Cisteru. teract the difficulties met in the operation. Again, the bleachedcotton would be liable to become very much soiled during thespinning and weaving and in many cases would have to berebleached when finished. Tlie processes used for bleaching yarn and cloth (alreadydescribed) cannot be used for bleaching raw or loose cotton ona(;coiint of tlie different nature of the material. 109 10
. Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects . No. 52. Bleach Cisteru. teract the difficulties met in the operation. Again, the bleachedcotton would be liable to become very much soiled during thespinning and weaving and in many cases would have to berebleached when finished. Tlie processes used for bleaching yarn and cloth (alreadydescribed) cannot be used for bleaching raw or loose cotton ona(;coiint of tlie different nature of the material. 109 100 TEXTILE CHEMISTItV AND DYELNG. The greatest difficulty is experienced in giving the h)ose cottonthe preliminary lye boil wliich is so efficient in removing the oilyand fatty matter iVom the fiber. In works where tliere is a fie-quent demand for bleached cotton, it might be well to have spe-cially constructed baskets or cages that will hold several hundredpounds, and have a traveling pulley overhead so that these baskets. Fig. 58. Mather & Piatt Improved Bleaching Cistern. when filled might be lowered for the necessary length of time intoa boiling lye bath, then raised, washed thoroughly and lowered ina bath containing bleaching powder solution, then washed, andinto a dilute acid bath and finally given a tliorough wash. In some cases an alkali boil is given by placing the cotton se-curely in bags, about 100 lbs. each, and then subjecting a numberi)f these filled bags to a lye boil in a regular kier, and then wash-ing, chemicking, souring and washing in o[)en tanks. Some bleachers have used regular raw stock dyeing machinessuccessfully for the bleaching of loose cotton. 110 TEXTILE CIIEMISTJIY AND DYEINHi. lUl Fiom laboratory experiments it has been found that the useof sodium hypochlorite solution (slightly alkaline) instead of cal-cium hypochlorite bleaches loose cotton vei-y satisfactorily and atthe same time aids to a considerable degree in the removal of thenatural impurit
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