Cap-Spinning

Cap-Spinning
CAP-SPINNING
This is a spinner's term given to the method of spinning on the cap-spinning frame in which each spindle has a metal cap. The threads pass round the rim as they are wound on the bobbin. The process is only used for botany and fine cross-bred wool yarns. The difference between the cap and the flyer and also the ring, is in the method of twisting and winding on. In the cap frame the spindle is stationary, but on it, and resting on the lifter-plate, runs a tube or shell which has a wharle at the bottom, by which it is driven. The bobbin fits on the barrel, being positively driven by means of a peg fixed over the wharle. Winding-on is aided by a removable cap, which guides the end on to the bobbin (worked in and out of the cap by the lifter) as the bobbin revolves, and causes it to " balloon " and draw round the bottom of the cap. As there are only tube and bobbin to drive, a much greater speed can be obtained - 6,000 to 7,000 revs. per minute - without excessive vibration on this frame; but on the other hand, owing to the centrifugal force on the thread, a rougher yam is produced. With short and fine merino wool this roughness is not too marked for many yarns; but on the coarse and open qualities the roughness is sufficient to make them almost useless.

Dictionary of the English textile terms. 2014.

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