(1) The extruder can be started up after the temperature is controlled. Before starting up, the machine head and the flange bolts of the extruder should be tightened again to eliminate the difference in thermal deformation between the bolts and the machine head. The order of tightening the head bolts is correct. Tighten the corners, with almost the same amount of effort. When tightening the flange nuts of the machine head, the surrounding bolts must be tightly loosened, otherwise the material will run out.
(2) To start, press the "ready to start" button, then connect the "start" button, and then slowly turn the extruder screw speed adjustment knob, the extruder screw starts to run at a slow speed. Then gradually speed up, while feeding a small amount of material. When feeding, always pay attention to the status of the server ammeter and the indication of the various indicators. The screw torque of the extruder must not exceed the blue standard (generally 65%-75% of the torque meter). Before the plastic aluminum profile is squeezed, no one can stand right in front of the die to avoid accidents caused by bolts breaking or the raw materials damp and cold. After the plastic is extruded from the die of the machine head, the extrudate needs to be cooled and led down the traction belt equipment and the shaping die, and these devices are activated. Subsequently, according to the marked value of the control instrument and the regulations on the extruded product, the various parts are adjusted relative to each other, so that the actual operation of all extrusion can be done in all normal conditions. And fill up the material according to the demand, the twin-screw extruder selects the metering feeder to feed the material at a uniform speed.
(3) When the feed of the die is uniform and the plasticization is good, the traction belt can be carried out to shape the sleeve. The discrimination of the plasticization level requires work experience. Generally, it can be distinguished according to the appearance of the extruded material, that is, the gloss of the surface layer, no impurities, no foaming, burnt material and discoloration, and the extruded material is finely squeezed to a certain level. No burrs, cracks, and a certain degree of ductility, this indicates that the material is well plasticized. If the plasticization is not good, the screw speed, barrel and head temperature of the extruder can be adjusted appropriately until the product meets the requirements.
(4) During the extrusion production process, check whether all the process parameters are normal according to the processing technology regulations, and fill in the process record sheet. Check the quality of the profile products according to the product quality inspection specifications, and immediately adopt countermeasures when problems are found.
