Twisting aprons are strong in clutching ability of rolls and elasticity and good friction factor, and can improve markedly the unevenness twisting.

Rubber aprons are for cotton production with high or mid sized yam. The aprons are of excellent elasticity in surface and of elastic grib with large molecular structure. The inner surface is of good wear-resistance, precise size and smooth surface. Stable sliver drawing is gained good gribbings when the upper aprons and the mid rollers in operation.