MWR is an automatic mat transversal weight regulation system installed above the forming line belt. The system regulates the distribution of the forming station every 100 mm along the width of the mat. By utilizing a feedback from the psd, the mwr system lowers the motorised bars which press down on the material upstream of the scalper in areas where weight distribution is lower, so that the scalper removes less material or none at all (the pre-pressed material passes below the level of the scalper or wobbler without being levelled off). Then, in areas where too much material has been distributed, the bars rise so that the material is not pressed down and the scalper can remove the excess material.