1. Reasons:
(1) a certain heater does not work and the material is poorly plasticized.
(2) the operating temperature setting is low, or the molecular weight distribution of plastic is wide and unstable.
(3) there may be foreign bodies that are not easy to melt.
2. processing methods:
(1) check the heater and replace it if necessary.
(2) verify the temperature of each section, and negotiate with the technician if necessary to raise the temperature setting value.
(3) clean up the extrusion system and head.
Failure analysis of small extruder:
The main electric starting current is too high.
1, causes: (1) heating time is not enough, torque is large. (2) a heater does not work.
2. Processing methods: (1) Handcart should be used when driving. If it is not easy, the heating time should be prolonged or the heaters in each section should be checked whether they are working properly.
The main motor emits abnormal sound.
1, causes: (1) main motor bearing damage. (2) a certain silicon controlled rectifier in main motor silicon controlled rectifier circuit is damaged.
2, processing methods: (1) replace the main motor bearing. (2) check the thyristor rectifier circuit and replace thyristor components if necessary.
Failure analysis of lab extruder in laboratory:
First, the head pressure is unstable.
1, causes: (1) the main motor speed is uneven. (2) feeding motor speed is uneven, feed volume fluctuates.
2, processing methods: (1) check the main motor control system and bearings. (2) check the feeding system motor and control system.
Two, the head pressure is unstable, the lubricating oil pressure is low.
1, the causes are: (1) the setting value of the pressure regulating valve of the lubricating oil system is too low. (2) oil pump failure or suction pipe blockage.
2, processing methods: (1) check and adjust the lubricating oil pressure regulating valve. (2) check the oil pump and suction pipe.
