Control system for macro adjustment of slot die forming polymer melt

摘要

Problem to be solved: to provide a system for adjusting a gap in a slot die for manufacturing a polymer web.Solution includes a slot die 10 having a polymer reservoir 10C extending between the polymer inlet 10a and the melt outlet 10B.The melt outlet 10B has a first edge 12a and a second edge 12b extending longitudinally along the melt outlet 10B.The plurality of actuators 20 move the second edge 12b along a plurality of positions, and the first edge 12a is spaced apart from the second edge 12b by a gap GC having an adjustable outer shape.The pressure sensor 30 measures the polymer pressure of the reservoir 10C, and the control unit 60 having the algorithm 60A correlates the outer shape of the gap GC with the pressure in the reservoir The algorithm 60A is configured to generate a control signal 62 for equalizing the outer shape of the gap.Diagram