The dyeing of textile fabrics . for 10—12 hours with 22 litres of causticsoda, 70° Tw. (Sp. Gr. 1*35), and washed: then boiled time for 10 hours •vsdth 16 litres of caustic soda,70° Tw., and washed; and finally steeped for two hoursin sulphuric acid, 2° Tw. (Sp. Gr. IOl), well washedand dried. In order to avoid tenderinsr the fibre in the nextoperation by reason of traces of acid left in the cloth, itis padded Avith carbonate of soda solution at 4° Tw.(Sp. Gr. 1-02), and then dried. 2nd Operatioji. Oiling.—The cloth is padded inthe open width in olive oil maintained at a constanttempe
The dyeing of textile fabrics . for 10—12 hours with 22 litres of causticsoda, 70° Tw. (Sp. Gr. 1*35), and washed: then boiled time for 10 hours •vsdth 16 litres of caustic soda,70° Tw., and washed; and finally steeped for two hoursin sulphuric acid, 2° Tw. (Sp. Gr. IOl), well washedand dried. In order to avoid tenderinsr the fibre in the nextoperation by reason of traces of acid left in the cloth, itis padded Avith carbonate of soda solution at 4° Tw.(Sp. Gr. 1-02), and then dried. 2nd Operatioji. Oiling.—The cloth is padded inthe open width in olive oil maintained at a constanttemperature of 110° C. Fig. 91 represents a section of the oil-padding Chap. XX.] ALIZARIN. 439 machine of Messrs. Duncan Stewart and Co. It consistsof a double-jacketed tank b (inside copper, outside iron)for containing the oil. It is heated by means of steam,and is provided with a series of rollers at the top andbottom. Above is a pair of heavy squeezing rollersc. The cloth is passed through as indicated in the figure,. ? C^ b b b O b^^ l^x>:^^^v-: .^ - -^sgj^ >^^^^;;ys\^^^v>^xKXvV. aH Fig. 91.—Oil-padding Machine. being well opened out and made free from creases beforeentering the oil, by means of the straining bars AAA, andafteiwards loosely plaited down by the folder d. After padding, the cloth is detached in ten-piecelengths, and hung in the drying stove, the temperatureof which is raised as rapidly as possible to 70 C, andthis is maintained for two hours. 3rd to 9th Operation. Lirjuoring.—Pad the clothseven times in the open width through a solution ofcarbonate of soda at 4° Tw., and hang in the stove no DYEING OF TEXTILE FABRICS. CChaj- XX. after each j^adding operation, maintaixiing the tempera-ture in each case for two hours at 75°—77° C. In winter the padding liquors are made waiia(35°—40° C), but in summer tliey are always cold, sinceif too hot, oil is stripped off the piece to an excessive andinjurious degiee. In the course of regular wo
Size: 2017px × 1239px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectdyesanddyeing, bookye
