Causes and solutions for plastic extruder malfunctions

Plastic extruder is a common plastic machinery equipment. During the daily operation of the extruder, various faults may occur, affecting the normal production of plastic machinery. The following are the causes and solutions for extruder faults:

Analysis of 5 types of plastic extruder faults

Analysis of Plastic Extruder Failure: Unstable Current in the Main Machine

1. Production reasons:

(1) Uneven feeding.

(2) A certain section of the heater is malfunctioning and not heating up.

(3) The main motor bearings are damaged or poorly lubricated.

(4) The screw adjustment pad is incorrect, or the phase is incorrect, and the components interfere.

2. Handling method:

(1) Check the feeder and troubleshoot.

(2) Repair the main motor and replace the bearings as needed.

(3) Check the adjustment pad and pull out the screw to check for any interference.

(4) Check if each heater is working properly and replace the heater if necessary.

Analysis of Plastic Extruder Failure: Main Motor Cannot Start

1. Reason for occurrence:

(1) There is an error in the driving program.

(2) The interlocking device related to the main motor functions

(3) There is a problem with the main motor thread, is the fuse burnt.

2. Handling method:

(1) Check the main motor circuit.

(2) Check if the emergency button has been reset.

(3) Check the program and restart driving in the correct order.

(4) The induction power of the frequency converter has not been fully discharged. Turn off the main power and wait for 5 minutes before restarting.

(5) Check if the lubricating oil pump is started and check the status of the interlock device related to the main motor. The oil pump cannot be turned on, and the motor cannot be turned on.

Analysis of Plastic Extruder Malfunction: Poor or Blocked Discharge from the Head

1. Reason for occurrence:

(1) There may be foreign objects that are not easily melted.

(2) A certain section of the heater is not working, and the material is poorly plasticized.

(3) The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable.

2. Handling method:

(1) Check the heater and replace it if necessary.

(2) Verify the temperature settings for each section and consult with the process engineer if necessary to increase the temperature settings.

(3) Clean and inspect the extrusion system and machine head.

Fault analysis of plastic extruder: high starting current of main power supply

1. Reason for occurrence:

(1) A certain section of the heater is not working.

(2) Insufficient heating time and high torque.

2. Handling method:

(1) When driving, use a hand cranked car. If it is not easy, extend the heating time or check if each section of the heater is working properly.

Analysis of Plastic Extruder Failure: Abnormal Sound from Main Motor:

1. Reason for occurrence:

(1) The main motor bearing is damaged.

(2) One of the thyristors in the rectifier circuit of the main motor is damaged.

2. Handling method:

(1) Replace the main motor bearings.

(2) Check the thyristor rectifier circuit and replace the thyristor components if necessary.