It is well known that elements exit from the roll reducing mill with length variations of up to +/- 1-2%, depending on the filling machine.
We have therefore designed and manufactured length compensation machines with the aim “to recover this difference”.
For an easier manufacturing and in particular for a correct distribution of the tolerances on the heating element length during bending it is important to have heating elements, where possible, with the same length.
There are different philosophy to compensate the heating elements length tolerance depending on the features and manufacturer preferences.
In principle, using heat-treated heating elements STRETCHING is the best solution, otherwise it is necessary to use roll to LENGHT COMPENSATION machine.