Crimp refers to waves, bends, twists or curls along the fibre length. It is expressed as crimps per unit length. Some natural fibers are linear, others form two-dimensional or three-dimensional crimps. Crimped fibers tend to have higher elongation than linear fibers.
Fibre direction is in which way most of the fibres lengths lie, relative to the length axis of the part.
After size, fiber length is the most important property of a fiber. Fiber length is critical in processing of fibers and yarns and in the translation of fiber strength to yarn strength. In general, a longer fiber length is preferred. Read more..