- wire store
The decoil-straightener is a combination of a decoiling/unspooling unit and a straightening unit used in conjunction with a material store. The endless material to be straightened is decoiled/unspooled from a coil/spool and directed to the straightening unit via several deflections (store) and a bending roll, always maintaining constant directions of deflection and curvature. Apart from the bending of the material around the bending roll, all the deflections around the pairs of pulleys are performed only elastically.
The coil/spool is rotatably mounted to enable the material to be paid off dynamically (preventing additional torsional stresses and helicities such as occur with static pay-off set-ups). The coil/spool is driven by an electric motor whose speed is controlled in accordance with the dancer position. A sensor scans the dancer position (height), producing an electric signal which is evaluated by a controller and relayed to the motor electronics.
The pull-off force acting on the material to be straightened is constant, consisting only of the straightening force and a variable dancer weight. Additional tensile forces caused by acceleration and deceleration, particularly in discontinuous processes, are minimized by the store function.
Equipped with the right mounting arrangement, users can change over quickly between various straightening devices, helix straighteners and killing-straighteners to suit the different types of material to be straightened. An additional stretch-bend-straightening effect can be produced by using a bending roll with brake, around which the material can wrap itself at least once. To produce a higher tensile stress in the material, on the other hand, a bending roll with brake should be placed in front of the straightening devices. The straightening unit normally takes the form of a straightening system with two straighteners.