The dyeing of textile fabrics . and this is done at one-eighth of the visual cost Thisprocess has been recently tried on a large scale with acertain degi*ee of success. 65. Yarn Scouring.—The scouring of woollen yamis more readily effected than that of raw wool if the oilwith which it has been impregnated by the spinner hasbeen of good quality (^ olive oil). It has alwaysbeen considered that the difficulty is increased if cheapoils have been used which contained an appreciableamount of mineral oil, since this, being a hydro-carbonand not a glyceride, is unsaponifiable. Experimentsby C. Rot
The dyeing of textile fabrics . and this is done at one-eighth of the visual cost Thisprocess has been recently tried on a large scale with acertain degi*ee of success. 65. Yarn Scouring.—The scouring of woollen yamis more readily effected than that of raw wool if the oilwith which it has been impregnated by the spinner hasbeen of good quality (^ olive oil). It has alwaysbeen considered that the difficulty is increased if cheapoils have been used which contained an appreciableamount of mineral oil, since this, being a hydro-carbonand not a glyceride, is unsaponifiable. Experimentsby C. Roth seem to show, however, that this view iseiToneous. a. StretcJting of Yarn.—Those yams which are hardtwisted requii-e this preliminary pix)cess in order toremove their curly appearance and to prevent them from^blinking during the subsequent scouring operation. Chap. VII.] WOOLLEN YARN STRETCHING. 103 For this purpose the • yani-stretching machine (Fig, 32)Li employed. It consists of two vertical iron screws d, connecting. Fig. 32.—Yam-stretchiDg Machine. two horizontal bars A, b, one above the other, eachfitted ^vith a series of metal pegs or arms c, on whichthe hanks are suspended. The lower bar b is fixed,while the upper one a is capable of being moAed up 104 DTEIXG OF TEXTILE FABRICS. [Chau TIL
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectdyesanddyeing, bookye
