Coil

For logistical reasons, products to be straightened (wire, strip, rope, etc.) are wound into coils. This entails laying the product, winding for winding, in the direction of the coil axis. If the coil is not rotated simultaneously during the laying, helicities will be produced with each winding. The product will then behave accordingly when it is pulled off. Pulling off the product statically in the direction of the coil axis will cause it to twist, and the quality of the straightened product will be negatively affected by additional helicities. These curvature fluctuations and helicities are difficult to eliminate and are therefore best avoided in the first place.

The beginning and end of a coil should always be marked in order to ensure its careful and correct further processing. Constriction-free securing of the ends prevents snap-back and avoids kinks.