Friday, 4 December 2009

Fiber Length and Spinning Performance

Fiber length in spinning is important because it influences spinning limit, yarn strength, evenness and hairiness. It also contributes to the handle and luster of the product by influencing the number of turns of twist required. It influences productivity via the end breakage rate and end breakage rate.

In general, fibers less than 4 to 5 mm are lost at the spinning stage. Fibers from 12 to 15 mm do not contribute to strength but only to the fullness of the yarn. It is only fibers greater than 15mm in length that produce other positive characteristics in the yarn.

Fiber length after carding is most important. Conditions at card and fiber characteristics should be such that the fibers survive carding without noticeable shortening in length.

The fiber lengths can be assessed with the help of a staple diagram.

Remember that the fibers in the boll do not show extremely great length differences. Noticeable differences arise even before the spinning starts. This happens due to mechanical working on the fibers at the ginning and
cleaning stage.

Rectangular Staple

Such diagram is achievable with synthetic fibers.
However such lengths can cause problems in drafting as in drafting stage fibers do not move individually but in bunches, thereby producing a high degree of unevenness.

Triangular Staple

It lends itself to better processing than rectangular staple diagram. However, it produces too many short fibers which cannot be maintained under control. Thus it produces hairy yarn.

Trapezoidal Staple
The fibers depicting such diagram are ideal for processing.

Stepped Staple

It indicates that fiber materials of different lengths are mixed in wrong proportions. It has the disadvantage that fibres move only in bunches which produce a high degree of unevenness.

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