Screw speed and screw back pressure are the first two o […]
Screw speed and screw back pressure are the first two of the five main process control factors for ABS engineering plastic extrusion molding. The details are described below:
The five major process elements to be controlled by ABS engineering plastics extrusion molding: screw speed. The rotation speed of the screw is adjusted in the host control of the extrusion line. The speed of the screw directly affects the amount of material output by the extruder, also determines the heat generated by friction, and also affects the fluidity of the modified plastic melt. The adjustment of the screw speed varies with the screw structure and the modified plastics being processed, depending on the shape of the product, the output and the cooling rate in the auxiliary machine.
Five major process elements to be controlled for ABS engineering plastic extrusion molding: screw back pressure. The perforated plate in front of the extruder, the screen and the adjustable resistance element on the head can produce different screw back pressures for the melt flow. The adjustment of the back pressure makes the materials get different mixing degrees and shears, which changes the plasticizing quality and the stability of the feeding.