. Cotton and cotton manufacture . n, the operations are practicallyidentical, but from here on the processes vary according to the productdesired. A hank of yarn is 840 yards (not to be confused with theworsted hank of 560 yards) and the number of hanks it takes to make apound is the basis upon which yarn is classified. Thus a coarse yarnwhich weighs only twenty hanks to the pound, would be called 20s,while 80s would be a very fine yarn. Various fabrics require different Twogrades of yarn, just as different finenesses of yarn must be spun from >ocessesvarying grades of cotton. The processes
. Cotton and cotton manufacture . n, the operations are practicallyidentical, but from here on the processes vary according to the productdesired. A hank of yarn is 840 yards (not to be confused with theworsted hank of 560 yards) and the number of hanks it takes to make apound is the basis upon which yarn is classified. Thus a coarse yarnwhich weighs only twenty hanks to the pound, would be called 20s,while 80s would be a very fine yarn. Various fabrics require different Twogrades of yarn, just as different finenesses of yarn must be spun from >ocessesvarying grades of cotton. The processes preparatory to spinning vary,not only with the counts to be spun, but with the use to which the yarnis to be put. Ordinary coarse and medium yarns for weaving usuallyfollow one process, while fine counts for weaving, or knitting yarn, orcoarse yarn made from long-staple cotton such as that used for lire-duck, go through a different preparation. The former are simplydrawn and reduced, while the latter are in addition combed. i23|. Roving Frame. FirstProcess Dratving In the ordinary process, which is by far the most commonly used,the sliver from the card is put through successive similar oper-ations, known as drawing, the object of which is to draw out the fibresand cause them to lie parallel to each other. Six card slivers are fedtogether between two pairs of rollers, the second of which is revolvingfaster than the first. The obvious result of this is the stretching ofthat portion of the slivers which is between the two sets of rollers. Theoperation is usually performed two or three times, in each case com-bining six strands into one. The sliver delivered by the third drawingmachine will be of the same diameter as the original card sliver, butwill contain more or less parallel fibres. f 24
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcottonm, bookyear1921
