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Plastic extrusion molding process

Essai Industries Co.,Ltd | Updated: May 02, 2018

Plastic extruder fault analysis

 Plastic extruder is a common plastic machinery equipment. During the daily operation of the extruder, various kinds of failures occur in the extrusion machine, affecting the normal production of plastic machinery. Here we analyze the failure of the extruder. Plastic extruder failure analysis: host current instability 1, production reasons: (1) uneven feeding. (2) Main motor bearings are damaged or have poor lubrication. (3) The heater of a certain segment is not functional and does not heat up. (4) The screw adjustment pad is not correct, or the phase is incorrect, and the components interfere. Plastic extruder 2. Processing method: (1) Check the feeder and troubleshoot. (2) Overhaul the main motor and replace the bearings if necessary. (3) Check that each heater is working properly and replace the heater if necessary. (4) Check the adjustment pad and pull out the screw to check whether the screw has interfered. Plastic extruder failure analysis: the main motor can not start 1, the reasons: (1) wrong with the driving program. (2) There is a problem with the main motor thread and whether the fuse is burned. (3) The interlocking device related to the main motor functions. 2. Processing methods: (1) Check the program and restart the car in the correct driving sequence. (2) Check the main motor circuit. (3) Check that the lubricating oil pump is started and check the status of the interlock device associated with the main motor. The oil pump does not open and the motor cannot be opened. (4) After the inverter's inductive power is not discharged, turn off the main power and wait 5 minutes before starting it. (5) Check if the emergency button is reset.

Failure analysis of the plastic material extruder: poor discharge or jamming of the machine head. 1. Cause: (1) The heater does not work and the material is plasticized. (2) The operating temperature is set low, or the molecular weight distribution of the plastic is wide and unstable. (3) There may be foreign materials that are not easily melted. 2. Processing methods: (1) Check the heater and replace it if necessary. (2) Verify the set temperature of each section, and negotiate with the technologist if necessary to increase the temperature setting value. (3) Clean up and check the extrusion system and head. Failure analysis of plastic extruder: The main electric current is too high. 1. Reasons: (1) Insufficient heating time and large torque. (2) A heater does not work. 2. Handling methods: (1) Apply a hand wheel car while driving. If it is not easy, then extend the heating time or check whether the heaters in each section are working properly. Failure Analysis of Plastic Extruder: The main motor emits an abnormal sound: 1. Causes: (1) The main motor bearing is damaged. (2) Damage to one of the thyristors in the SCR of the main motor. 2. Processing methods: (1) Replace the main motor bearings. (2) Check thyristor circuit and replace thyristor components if necessary

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