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Talking about the daily use of plastic extruder

by:TENGDA     2022-12-27
​The plastic extruder is a kind of machine in the plastic extrusion production line. Only by grasping the operating points of the plastic extruder can it be used correctly and reasonably. When using plastic extruders, we believe that the following items should be paid special attention to:

1. Preparations before starting up
For extruded plastics, the raw materials should meet the required drying requirements, and the raw materials should be sieved to remove agglomerates and mechanical impurities.
Check whether the water, electricity and gas systems in the equipment are normal, ensure that the water and gas channels are smooth and leak-free, whether the electrical system is normal, whether the heating system, temperature control, and various instruments work reliably; Whether the equipment is running normally; start the vacuum pump of the calibrating table to observe whether the work is normal; lubricate the lubricating parts of various equipment. If a fault is found, eliminate it in time.
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2. Start up
After the temperature is constant, the machine can be turned on. Before starting the machine, the bolts of the machine head and the extruder should be tightened again to eliminate the difference in thermal expansion between the bolts and the machine head.
After the plastic is extruded from the nose die, the extrudate needs to be cooled slowly and led to the traction device and the calibrating die, and these devices are activated. Then, according to the indication value of the control instrument and the requirements for the extruded product, make corresponding adjustments for each part, so that the entire extrusion operation can reach a normal state.
Add enough material as needed, and the twin-screw extruder uses a metering feeder to feed material evenly and at a constant speed.
When the output of the die is uniform and the plastic is good, it can be drawn into the setting sleeve. The judgment of the degree of plasticization needs to be based on experience. Generally, it can be judged according to the appearance of the extruded material, that is, the surface is shiny, free of impurities, foaming, scorched and discolored. Squeeze the extruded material by hand to a certain extent without appearing Burrs, cracks, and a certain degree of elasticity indicate that the material is well plasticized. If the plasticization is poor, the screw speed, barrel and head temperature can be adjusted appropriately until the requirements are met.

3. Stop
Stop feeding, squeeze out the plastic in the extruder, and when the screw is exposed, turn off the power supply of the barrel and machine head, and stop heating.

Note: The installation and commissioning of the equipment are generally clearly stipulated in the instructions for use, and it is a major premise for operators to be familiar with the equipment they operate. Such as mastering the structural characteristics of the screw, the characteristics of the control instrument for heating and cooling, the characteristics of the head and the assembly condition, etc., in order to correctly grasp the extrusion process conditions and operate the machine correctly.
This is an global standard which acts as a form of promise that Nanjing Tengda Machinery Co., Ltd. manufatures according to the finest quality standards.
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Nanjing Tengda Machinery Co., Ltd. has never conceded on the quality and the services of the products which provided to the customer.
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