A control method for the processing and supply of plastic material during the extrusion shaping.

摘要

PCT No. PCT/SE87/00112 Sec. 371 Date Aug. 17, 1988 Sec. 102(e) Date Aug. 17, 1988 PCT Filed Mar. 5, 1987 PCT Pub. No. WO87/05259 PCT Pub. Date Sep. 11, 1987.Method for controlling the processing and output feeding of plastic melt by extrusion, by means of an extrusion plant including a process unit (1) for processing the plastic material, a pump (3) for feeding the plastic melt to a die (4) or the like, and a screen pack assembly positioned between the process unit (1) and the pump (3). In the process unit (1) the melt is imparted a constant level of kinetics of extrusion, and the plastic melt pressure (P2) between the screen pack assembly (2) and the pump (3) is kept above a predetermined level. As a measure of the level of kinetics of extrusion, the pressure (P1) of the melt between the process unit (1) and the screen pack assembly (2), is used, preferably in combination with the melt pressure (P2) after the screen pack assembly (2).