**2.2 Length/diameter**

Length is an important characteristic that defines the usefulness of a textile fiber. The length should also be many times its diameter. In general, this would mean that when one talks of fiber length in terms of a few centimeters it has to be a few microns of fiber diameter. The staple length of spinnable fibers is generally not less than 18 mm. Fibers below 5 mm are just not integrated into the yarn. In the case of filament fiber this ratio would be very large and perhaps irrelevant. The cut staple length depends on the spinning system to be used and the fiber it is blended with in case of blends [6].
