The small extruder has the advantages of high output, high quality, high speed and high torque. It is mainly used for extrusion, granulation and rolling of wood-plastic materials, uniform plasticization and stable operation. Below, let's take a look at the correct operating specifications for a small twin-screw extruder.
1. Preheating and heating: The main power switch and each section of the electric heater power switch are closed, and the parameters are set for each heating zone (about 120 degrees) according to the process, and the temperature rise is started.
2. After the heating temperature of each section reaches the set value, continue to maintain the temperature for 30~45 minutes. (Because the process of transferring the temperature from the cylinder to the screw requires a long time, it is necessary to further test each section of the temperature control instrument and The accuracy of the solenoid valve work.
3. Move the elastic coupling with the hand plate to determine the normal. The connecting metal sleeve of the twin-screw mandrel and the transmission box should be checked to see if it has slipped in the direction of the gearbox. If it slides too much, it is likely to damage the meshing end of the root of the mandrel under high torque conditions, generally for some domestic twin-screw manufacturers. It is ready to start the main motor, close the power switch, auxiliary power switch and start button, set the main engine speed, and gradually increase the main screw speed. The idle speed is not higher than 40r/min, and the time is less than two minutes.
4. If there is no abnormality in the idling of the small twin-screw extruder, press the start button of the feeder to adjust the feed speed setting to start feeding at the lowest possible speed. After the material is discharged from the standby head, the feed screw speed and the main screw speed are slowly increased, so that the feeder and the main engine speed are matched. When the adjustment is made, the host current indication is closely monitored at any time, so that the host current does not exceed the rated current, and the unit is also noted. If there is any abnormality in operation, stop it in time.
5. In order to avoid high-shear mixing and overheating of materials, each section of the cylinder is equipped with a soft water circulation cooling system. During the start-up phase, the cooling system does not need to be opened. After the operation, observe the temperature rise of each section of the mainframe and determine the use of the cooling system as appropriate.
