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The manufacturer of Twin Bimetallic Screw and Barrel will show you the operating points of the extruder
The manufacturer of Twin Bimetallic Screw and Barrel tells you that when making different plastic products, the operating points of the extruder are different, but there are also similarities. The following Twin Bimetallic Screw and Barrel manufacturer briefly introduces the same operating steps when extruding various products and the operating points of the extruder that should be paid attention to.
Preparation before driving:
1. Plastic for extrusion molding. The raw materials should meet the required drying requirements, and further drying should be done if necessary. The raw materials are sieved to remove agglomerates and mechanical impurities.
2. Check whether the water, electricity, and gas systems in the equipment are normal, to ensure that the water and gas paths are unblocked and leak-free, whether the electrical system is normal, whether the heating system, temperature control, and various instruments are working reliably; the auxiliary machine is empty and the car is running at a low speed. , Observe whether the equipment is operating normally; start the vacuum pump of the sizing table to observe whether the work is normal; add oil to lubricate the lubricated parts of various equipment. The manufacturer of Twin Bimetallic Screw and Barrel tells you that if any fault is found, it will be eliminated in time.
3. Install the head and sizing sleeve. The manufacturer of Twin Bimetallic Screw and Barrel tells you to choose the specifications of the machine head according to the product variety and size. Install the machine head in the following order.
1. You can start driving after the constant temperature. Before driving, tighten the head and extruder flange bolts again to eliminate the difference in thermal expansion between the bolts and the head. The order of tightening the head bolts is to tighten diagonally, and the force should be even. . When tightening the flange nuts of the machine head, the tightness of all sides must be consistent, otherwise the material will run out.
2. To drive, first press the "Ready to Drive" button, then connect the "Start" button, and then slowly rotate the screw speed adjustment knob, the screw speed starts slowly. Then gradually speed up, while adding a small amount of material. Pay close attention to the indication changes of the host ammeter and various indicator heads when feeding. The manufacturer of Twin Bimetallic Screw and Barrel tells you that the screw torque cannot exceed the red mark. Before the plastic profile is extruded, no one is allowed to stand directly in front of the die to prevent injury accidents due to bolts breaking or damp and foaming raw materials.
3. When the die is uniformly discharged and the plasticization is good, it can be pulled into the shaping sleeve. The manufacturer of Twin Bimetallic Screw and Barrel tells you that the judgement of the degree of plasticization requires experience. Generally, it can be judged according to the appearance of the extruded material, that is, the surface is shiny, free of impurities, no foaming, burnt material, and discoloration. Extrude it by hand The material is extruded to a certain extent without burrs and cracks, and has a certain degree of elasticity. At this time, the material is plasticized well. If the plasticization is poor, the screw speed, barrel and head temperature can be adjusted appropriately until the requirements are met.
4. During the extrusion process, check whether various process parameters are normal according to the process requirements. The manufacturer of Twin Bimetallic Screw and Barrel tells you to check the quality of the profile products according to the quality inspection standards, and take timely solutions when problems are found.