. 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. Fig. 267.—Intermediate Condenser (plan). Finally, it may be mentioned that one frame (generallythe second) in each set is fitted with a counting device whichstops the machine automatically when a given length ofslubbinghas been produced. The slubbings are then weighedsepara
. 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. Fig. 267.—Intermediate Condenser (plan). Finally, it may be mentioned that one frame (generallythe second) in each set is fitted with a counting device whichstops the machine automatically when a given length ofslubbinghas been produced. The slubbings are then weighedseparately and united in such a manner that when doubledin the succeeding frame they will yield a uniform precaution is necessary because the combed slivers arenever of such regularity as the production of a uniform yarnrequires. When coloured mixture )arns are to be produced thewool is dyed after combing, but great care has to be exercisedin mixing and drawing in order to ensure regularity in theproduct. Of late the practice has arisen of forming patternsby printing the combed top. TEXTILE RAW MATERIALS. 429 B.—ROVING. This, the final operation for producing a loose, coarserove yarn ready for fine spinning, is conducted on the same. Fig. 268.—Finisher Roving Frame (vertical section). principles as doubling and slubbing, but differs therefromin the manner of winding the product, and in the method ofbuilding the bobbin. 430 TEXTILE RAW MATERIALS. Thus, whereas hitherto the finished bobbins have hada cylindrical shape with crossed windings, the rove bobbinsare cylindrical with conical ends, and the coils are in lesssteeply pitched spirals. The difference in the manner ofwinding is, however, so slight that, as in the case of cotton,the whole of the drawing, slabbing and roving operationsmay be regarded as coming under the last-named category. Finisher Roving Frame (Fig. 268).—The slubbing bobbins,b, mounted in the creel, a, deliver the slubbings, c, over theguide ro
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttextile, bookyear1901
