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The fibres in combed top tend to be of a fairly uniform length due to the method of preparation. Though drawing it into strips may line the fibres up a bit. [1] [2] Roving is not to be confused with sliver as there is twist in roving. Pencil roving is a type of roving that has been drawn until it is the size of a fat pencil. It can be used by ...
The row of pins known as a top comb is a very fine tooth comb, for example, 25 teeth per inch; it is inserted in cylindrical combed fringe to act as an impediment to contaminates (burr, seed etc.) flow. The top comb acts as an impediment to contamination moving into a combed sliver. On a next circular combing short finer and contaminants are ...
Topmaking mills make wool top, a semi-processed product from raw wool. The process requires that the wool be scoured (washed) and combed and sorted. The longer fibers resulting from the process are called tops, and are in a form ready for spinning. To be closer to customers, some of the industry has moved from Australia, Europe and the US to China.
When sliver is drawn further and given a slight twist, it becomes roving. [ 2 ] [ 3 ] Worsted textiles differ from woolen textiles in that, after carding, they are subjected to gilling, a process to make sure the sliver has a more uniform linear weight, and lubricants are added.
The combed fiber can then be drafted to form a sliver or roving (if the fibers are twisted slightly after drafting, it is called a roving—if not, it is a sliver), or spun directly. The short draw technique can be done from carded rolags, as well, but this does not produce a strictly worsted yarn. Yarns spun from a rolag will not have all the ...
In lapping the dust is removed to create a flat sheet or lap of fibres; Carding itself is the combing of the tangled lap into a thick rope or sliver of 1/2 inch in diameter, it can then be optionally combed, is used to remove the shorter fibres, creating a stronger yarn. A combing machine. In drawing a drawing frame combines 4 slivers into one.
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It is hand spun from combed top, and the fibres all lie in the same direction as the yarn. A woollen yarn, in contrast, is hand spun from a rolag or other carded fibre (roving, batts), where the fibres are not as strictly aligned to the yarn created. The woollen yarn, thus, captures much more air, and makes for a softer and generally bulkier yarn.