. Textile raw materials and their conversion into yarns : (the study of the raw materials and the technology of the spinning process) a text-book for textile, trade and higher technical schools, as also for self-instruction ; based upon the ordinary syllabus and curriculum of the Imperial and Royal Austrian weaving schools. means of thethread guide, li, and the winding roller, /, on to the bobbins, k. A plush-covered catch roller,^, takes up any broken endsuntil the minder notices and repairs the damage. Finally,mention should be made of the very slow movement impartedto the rollers, t\ c-, th
. Textile raw materials and their conversion into yarns : (the study of the raw materials and the technology of the spinning process) a text-book for textile, trade and higher technical schools, as also for self-instruction ; based upon the ordinary syllabus and curriculum of the Imperial and Royal Austrian weaving schools. means of thethread guide, li, and the winding roller, /, on to the bobbins, k. A plush-covered catch roller,^, takes up any broken endsuntil the minder notices and repairs the damage. Finally,mention should be made of the very slow movement impartedto the rollers, t\ c-, the result of which is to keep the steelbands continualK changing their position, thus presentingfresh clean surfaces at the point of intersection, and preventingthe accumulation of wool fibres or other dirt there. Thisslight motion of the bands has no influence on the division ofthe fleece. C—FINE SPINNING. Spinning converts the loose, coarse, untwisted sliver into afirm, fine, more or less strongly twisted finished product, object is attained by the aid of machines, which draw TEXTILE RAW MATERIALS. 371. ^^m^jmmm^^^^^^^^j^. Fig. 237.—The Bolette Sleel Band Condenser (vertical section). 372 TEXTILE RAW MATERIALS. and attenuate the sliver, and at the same time impart thenecessary twist. The degree of twist depends on :— (a) The fineness of the sliver. (b) The count of yarn to be produced. (c) The length of staple of the wool. (d) The draft to which the sliver is subjected. (e) The purpose for which the yarn is to be used. As already mentioned in the case of cotton, a whole rangeof counts of yarn, within certain limits, can be produced froma given sliver, though where the difference is extreme thesliver should be modified to come more into proportion withthe finished product. The twist should be great enough to ensure that thefriction between the fibres in the thread is greater than theforce required to draw them apart ; it also depends on thethickness of the yarn
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttextile, bookyear1901
