Extruder operating points of the car step description !
Extruder operating points of the car:
（1）to drive the extruder after the thermostat , before driving the head , and the extruder should be tightened once the flange bolts , the bolt head to eliminate the difference in thermal expansion of the order of tightening the bolt head is tightened diagonally , forced to be uniform . When tight head flange nuts , surrounded by elastic consistency requirements , otherwise expected to run .
（3）to drive the election by " ready to drive " button , followed by "Drive " button , then slowly rotate the knob screw speed , screw speed slow start . Then gradually accelerate , while a small amount of feed . Pay close attention to the instructions and various changes in the host meter indicates when charging header circumstances . Screw torque should not exceed Red Label ( typically 65% -75% torque table ) . Before being extruded plastic profiles , no person shall stand in front of the die to prevent the bolts pulled off or put wet bulb due to reasons such raw materials to produce injury. Plastic extrusion die head from behind , it will take the extrudate to cool slowly and cited the traction device and stereotypes die and start these devices. Then the value of the instructions and control instrumentation requirements for extrusion products . The adjustment of each part corresponding to the entire extrusion operation reaches the normal state. And, if necessary add a little material, twin-screw extruder using constant feed metering feeder evenly ground .
（3） die out when the plastic material uniformly excellent and good people can pull calibrator . Need to empirically determine the degree of plasticizing , generally based on the appearance of extruded material to determine that the shiny surface , no impurities, no foam, coke material and color, hand out material to squeeze down to a certain extent does not appear burrs , nicks , there is some flexibility , then a good description of plastics materials . If poor plasticizing screw speed can be adjusted , and the cylinder head temperature , until the request.
（4） In the extrusion process, the process should require periodic inspection of various process parameters are normal , and complete the process sheets. Quality inspection by the quality inspection standard product profiles , identify problems and timely corrective action taken .