1 when increased twist coefficient material, also is the twist improve, like wire wound into a spiral spring, loop number, modulus is low, fatigue resistance performance is better. On the canvas, improve fine yarn twist, and improve the canvas of latitude and crimpness, like make a steel wire bending like water ripples, so that the wire becomes and spring like, reduce material modulus, the fatigue resistance is improved.

2 material modulus is higher, the greater the need to reduce the modulus of the composites by improving the twist, improve its fatigue resistance.

3 compression amount bigger, material is easy to fatigue, and compression of the material damage is greater.

Multilayer conveying belt in the skeleton material, through the front of the roller, almost all the layers between subjected to a tensile force, just stretching quantity different ways; crimp degree is low, the tensile modulus high canvas on the drum, if the canvas deformation amount is not enough, it will make the inner canvas compression occurs wrinkling, inner canvas can no longer bear tensile stress the role of. The original share of tension all transferred to the outer layer, resulting in greater pressure on the outer canvas by force, and the bottom layer under the action of the pressure of the outer layer, has been a great force of compression. This is someone trying to use glass fiber cloth production of multilayer conveyor belt, reason and glass fiber cloth will often tear, because is the dynamic contact roller conveyor belt conveyor belt located in the whole stress is the biggest place, if at this time the inner canvas all compression, not share stress, outer layers of canvas will tear, and into the drum, the stress will be greatly reduced, thus in tension and compression of the alternating stress effect, crimp degree lower, alternating amplitude is greater, which will seriously affect the service life of conveyor belt.