The left-wound and right-wound spirals are fitted Tightly together althernately and jointed with straight Rods. A4 uses 4 rods for one spiral to joint. A3 uses  3 rods for one spiral to joint.

1. Since the surface is flat and smooth ,the belts can
Carry small items and unstable products.
2.The allowable tension is high,so that heavy load
Can be transported.
3.The belt strength against pressure high,so that
The belts can be used for processing under pressure.
4. The belts can be used at haigh temperature.
5. The belt can be used for textile producs refining
And cleaning process.
The belt can be used for textile producs refining
And cleaning process.