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warp threads
Warp Yarn in Weaving
In the ancient production of linen on vertical hand looms, warp yarns (threads) were the up and down threads on the loom. They were often lubricated with crude starch to make it easier to weave the weft threads over and under the warp threads. Weft is the term for the yarn which is passed over and under the warp yarn. A device called a shuttle is usually used to move the weft yarn over and under the warp yarn. By varying the number of warp threads passed over or under (for instance over one, under two, and so forth), and varying the starting point, different patterns of cloth can be created. Such patterns are called twill. Examples of twill include gabardine, tweed, serge and herringbone. weft threads twill in weaving "
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