A new solution for the control system of the cross cutter in the board factory

Abstract

The paper presents a new control system implemented in the phase of reconstruction and modernization of the Valmet 14.5
transverse cutter in the cardboard factory "Umka" near Belgrade, Serbia [1]. The new control system was implemented using a PLC
with integrated PROFInet and PROFIBUS communication protocols. Transverse cutters are used for transverse cutting of cardboard or paper tape into pieces of predetermined length, when unrolling it from the roll. The basic requirements that must be met are: reliable operation, work with high tape speeds in the cutting process, high accuracy of the length of the cut pieces, quality cutting, without creasing, tearing, or crushing at the cutting site. In the operation of transverse cutters, the strip being cut reaches the flying shears at the desired speed, which is determined by the speed of rotation of a pair of rollers called the press (press drive). Flying scissors consist of two blades placed perpendicular to the movement of the tape, the length of blades corresponds to the maximum width of the tape being cut (shear drive). The paper also presents the characteristics and technical requirements of the basic functional units of the transverse cardboard tape cutter from the point of view of control. The synchronized operation [2, 3] of the main electric drives powered by frequency converters is described and analyzed, which ensures the adjustment of the peripheral speed of the cutter blades, which is necessary for proper operation. The paper presents the results recorded at the reconstructed transverse cutter plant.