Staple (wool)

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

Samples from natural fibers and cracked or Converted (angular or trapezoidal section) material contain fibers of different lengths. In cut the staple length synthetic fibers is the same as the average length of all fibers.

The fiber length (and their distribution), when working at the mill one of the most important criteria for determining the most appropriate technology.

Processing cotton is a so-called hand stack provides general information. This is a drawn with the fingers ( upper panel) and folded tuft of about ten percent of the longest fibers (lower panel ).

The length of natural fibers (except natural silk ) was tested up to the 70s of the 20th century with the help of mechanical devices. From the sample fibers were combed out and individually with tweezers or down in small bunches lengthwise side by side on a velvet cushion. From formed in this type of curve ( Stacked Graph ) data could be derived which are necessary for the adjustment of the spinning machines. The creation of a cotton sample lasted about five minutes for wool you needed about four times the time.

Modern electronic devices can in a few seconds to create a stack chart, analyze and print.

As a staple fibers all textile natural and synthetic fibers are known except filaments. Worldwide, more than 50 million tonnes of staple fibers are produced annually, is involved in the (2004 ) Cotton with 26 and man-made fibers with about 15 million tons.

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