What is the situation of unstable discharge of twin-screw extruder?


The twin-screw extruder refers to a dispersion in which […]

The twin-screw extruder refers to a dispersion in which solid powder and liquid coexist and mainly solid phase, using the self-adhesiveness of the dispersion to force the basic particles of the solid powder to bond and increase each other. And form a certain shape and uniform particle size, concentrated particle group. So in the process of use, what is the situation of the unsteady discharge of the twin-screw extruder? What are the common faults?

Unstable discharge of twin screw extruder
1. Reason analysis:
There are some sections in the heater that do not work, and the material is not plasticized; the operating temperature is set too low, or the molecular weight distribution of the material is wide, and the performance is unstable; there may be foreign objects that are not easy to melt, such as small metal blocks and sands. The extruder blocked the head.
2. Solution:
Check the heater and replace if necessary; verify the set temperature of each section, negotiate with the process technician if necessary to increase the temperature set value; clean and check the extrusion system and head of the extruder.

Common faults of twin screw extruder
1. The main motor cannot be started
Cause: There is an error in the driving procedure. There is a problem with the main motor thread, whether the fuse is burned.
Solution: Check the procedure and restart the car in the correct driving sequence. Check the main motor circuit. Check whether the lubricating oil pump is started, and check the status of the interlocking device related to the main motor. If the inverter has not discharged the induction current, turn off the main power supply and wait for 5 minutes before starting. Check whether the emergency button is reset.

2. The main motor makes an abnormal sound
Cause: The main motor bearing is damaged. One of the SCRs in the SCR rectifier circuit of the main motor is damaged.
Solution: Replace the main motor bearing. Check the thyristor rectifier circuit and replace the thyristor component if necessary.

3. The host current is unstable
Causes: uneven feeding, damaged or poor lubrication of the main motor bearings, a certain section of heater failure, no heating, wrong screw adjustment pad, or wrong phase, component interference.
Treatment method: check the feeder and troubleshoot. Overhaul the main motor and replace the bearings if necessary. Check whether the heaters are working properly, and replace the heaters if necessary. Check the adjustment pad and pull out the screw to check if there is any interference in the screw.

4. The temperature rise of the main motor bearing is too high
Cause: Poor bearing lubrication. The bearings are severely worn.
Treatment method: check and add lubricant. Check the motor bearings and replace if necessary.