Tension levelling, also called ABT, is a levelling process consisting of a combination of stretching (flange rolls) and bending of the material (overlapping on the levelling rolls). It is the combination of these two processes that differentiates tension levelling from so-called “multi-roll” levelling, resulting in higher levels of plasticisation. With multi-roll levellers, plastification ratios of 80% of the thickness can be achieved, while the ABT is used to plasticise the entire thickness of the sheet. As such, the main benefits of our tension levelling lines are as follows:
The main characteristics of these lines are as follows:
The ABT is composed of 3 main parts: inlet flange rollers, levelling units and outlet flange rollers. In this way, depending on the type of material (steel / aluminium) and the thickness to be processed, they are sized to achieve optimum flatness of the material. The heart of this system is the levelling unit, which is made up of 3 different parts: immersion rollers (1 or 2 units), anti cross-bow rollers and anti coil-set rollers (see figure below).
Stretching is obtained based on the speed difference between the inlet flange rollers and the outlet flange rollers. This control is fully automatic, carried out by means of commands sent to the electric motors that drive the flange rollers.
Proccesing and cutting lines
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