What are the operating points of the plastic extruder?
When making different plastic products, the operating points of the plastic extruder are different, but there are also similarities. The following is a brief introduction to the same operation steps when extruding various products and the operating points of the extruder that should be paid attention to.
1. Preparation before driving
(1) Plastics for extrusion molding. The raw material should meet the required drying requirements, if necessary, it needs to be further dried, and the raw material should be sieved to remove agglomerated particles and mechanical impurities.
(Check whether the water, electricity, and gas systems in the extruder are normal, 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 , observe whether the equipment is operating normally, start the vacuum pump of the shaping table, and observe whether the work is normal; add oil to the wet parts of various equipment. If any fault is found, remove it in time.
(⑶) Install the machine head and the setting sleeve. According to the variety and size of the product, select the specifications of the machine head, and install the machine head in order.
(0 You can start the machine after the temperature is constant. Before starting the machine, you should tighten the flange bolts of the machine head and the extruder again to eliminate the difference in thermal expansion between the bolt and the machine head. Be uniform. When tightening the flange nut of the machine head, it is required that the four sides should be tight and tight, otherwise the material will run out.
(To drive, first press the 'Ready to drive' button, then connect the 'Drive' button, then slowly turn the screw speed adjustment knob, the screw speed starts slowly. Then gradually increase the speed, and at the same time add a small amount of material. Pay close attention to the ammeter of the main engine when feeding And the indication changes of various indicator heads. The torque of the screw cannot exceed the red mark (generally 5%-75% of the torque gauge). Before the plastic profile is extruded, no one is allowed to stand in front of the die to prevent The bolts are broken or injury accidents occur due to the moisture and foam of the raw materials. After the plastic material is extruded from the die of the machine head, it is necessary to cool the extruded product slowly and lead it to the traction device and the setting die, and start these Then, according to the indication value of the control instrument and the requirements for the extruded product, adjust each part accordingly, so that the entire extrusion operation can reach a normal state. And add enough material according to the need, the twin-screw extruder adopts metering and feeding The device adds rice bucket evenly and at a constant speed.
(1) Stop feeding, squeeze out the plastic in the extruder, and when the screw is exposed, turn off the power of the barrel and head, and stop heating. ⑵Turn off the power supply of extruder and auxiliary machine, so that the screw and auxiliary machine stop running.
() Open the connecting flange of the machine head and remove the machine head. Clean the perforated plate and various parts of the machine head. In order to prevent damage to the inner surface of the machine head during cleaning, the residual material in the machine head should be cleaned with steel laws and steel sheets, and then the plastic adhered to the machine head should be removed with sandpaper, polished, and coated with machine oil or silicone oil to prevent rust.
(4) Cleaning of the screw and the machine room. After removing the machine head, restart the main machine, add parking material (crushed material), and clean the screw and barrel. At this time, the screw is selected at a low speed (about s/min to reduce wear. After the parking material is crushed into powder and completely extruded, use compressed air to repeatedly blow out the residual pellets and powder from the feeding port and the exhaust port until there is no residual material in the barrel, then reduce the screw speed to zero and stop extrusion machine, turn off the main power supply and the main cold water valve.
(⑤) The safety items that the extruder should pay attention to during extrusion include: electricity, heat, mechanical rotation, and installation of heavy parts. The plastic extruder workshop must be equipped with lifting equipment to assemble and disassemble heavy parts such as machine heads and screws to ensure safe production.
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