Extrusion control

Details Extrusion control Extrusion control

B - Operations, Transporting

29

C

18/719

B29C 47/92 (2006.01) B29C 44/60 (2006.01) B29C 47/10 (2006.01) B29C 47/88 (2006.01)

Patent

CA 1257759

ABSTRACT EXTRUSION CONTROL An extrusion process is controlled by feeding the material to be extruded from a supply station (5) to an extruder (1) and repeatedly weighing the supply station to calculate the throughput of the extruder. The initial line speed necessary to produce a predetermined weight/metre of extrudate is calculated and the line speed is adjusted accordingly. Subsequently, the throughput and the line speed are increased simultaneously, such that the weight/metre is maintained substantially constant until any one of a plurality of parameters such as line speed, screw speed, motor load current, extrudate temperature, melt pressure, etc reaches a predetermined maximum value. Thereafter either the line speed or extruder throughput is adjusted such as to maintain the weight/metre of the extrudate substantially constant at the desired value.

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