They are conceived for horizontal transport in low distance for one or more products and qualities in the same time and in different direction thanks to the possibility to be composed.
The simple rotation of the spiral determines conveyance. This movement is pre-fixed by means of combination of direction of rotation of the spiral and right left inclination of the same.
In the case of paddle worm, direction of conveyance can be varied next by means of inclination of paddles. Capacity is determined by diameter, foot, degree of filenes and the number of turns of spiral.