Pile (textile fiber)

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Pulling a cotton staple.jpg
Tuft (approx. 40 mg cotton)

Stack is the average length of all fibers in a sample .

Samples made from natural fibers and torn or converted (diagonal or trapezoidal cut) material contain fibers of different lengths. In the case of cut synthetic fibers, the staple length is identical to the cut length of all fibers.

The fiber length (and its distribution) is one of the most important criteria for determining suitable technology in processing in the spinning mill.

A so-called hand pile provides general information on cotton processing . This is a tuft of fibers pulled with the fingers (top picture) and folded up from around ten percent of the longest fibers (bottom picture).

The length of natural fibers (except natural silk) was tested using mechanical devices until the 1970s. Fibers were combed out of the sample and, individually or in small tufts, placed lengthwise next to one another on a velvet cushion using tweezers. From the curve ( stack diagram ) formed in this way, it was possible to derive data that are necessary for setting the spinning machines. The creation of a cotton sample took about five minutes for wool was needed about four times the time.

Modern electronic devices can create, evaluate and print out a stack diagram in a few seconds.

All textile natural and synthetic fibers except filaments are referred to as staple fibers . More than 50 million tons of staple fibers are produced worldwide every year. In 2004 the proportion of cotton was 26 and the proportion of man-made fibers approx. 15 million tons.

Staple fiber yarns are often used as a generic term for yarns that are not made from filaments.

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