What are the common fault causes of plastic bottle extrusion melt pumps?

Plastic bottle extrusion melt pumps play a crucial role in the plastic extrusion molding process, but they may also experience various faults. Below are some common fault causes and corresponding solutions:

1. Non-rotating Melt Pump

Fault Cause: The shaft and shaft sleeve are seized.

Solution: Disassemble the melt pump and send it back to the factory for repair.

2. Material Leakage

Fault Causes:

Leakage at the seal.

Leakage at the cover plate.

Solutions:

For seal leakage, try passing cooling water or air, and replace the packing or seals.

For cover plate leakage, after heating the melt pump, retighten the cover plate screws and apply high-temperature sealant between the cover plate and pump body.

3. Excessive Temperature Rise

Fault Causes:

Malfunction of the temperature sensor, heating tube, or instrumentation.

Structural issues with the pump body.

Insufficient smoothness of the melt pump.

Excessively high material viscosity.

Solutions:

Check if the temperature sensor, heating tube, and instrumentation are functioning normally, and repair or replace them promptly if any abnormalities are found.

Inspect and optimize the pump body structure.

Improve the smoothness of the melt pump.

For excessively high material viscosity, adopt forced cooling measures such as air or water cooling.

4. Pump Noise

Fault Causes:

Friction between the shaft and shaft sleeve.

Friction between the shaft and seal.

Noise from the motor or reducer.

Solutions:

Check and adjust the fitting clearance between the shaft and shaft sleeve, and between the shaft and seal.

Consider using a pulsation-free melt pump or a more precise drive system.

Check if the motor and reducer are functioning normally, and repair or replace them promptly if any abnormalities are found.

5. Unstable Outlet Pressure

Fault Cause: May be related to factors such as the influence of temperature on pressure and unstable inlet pressure.

Solution:

Adjust process conditions, such as increasing or decreasing inlet pressure.

Use a closed-loop control system to stabilize outlet pressure.

6.Black Spots in Products

Fault Causes:

Carbonized material residue inside the melt pump.

Impurities in the material.

Solutions:

Improve the smoothness of the melt pump to prevent prolonged material residence in the pump that could lead to carbonization.

Use a screen changer to filter impurities upstream.

7.Other Faults

Fault Causes: Issues such as solid particle blockage at the pump inlet and control circuit problems may also lead to melt pump faults.

Solutions:

Regularly inspect and clean the pump inlet to prevent solid particle blockage.

Optimize the control circuit, add interlock logic, and other preventive measures to improve the management and control level of the melt pump.

To avoid these faults, it is necessary to strengthen equipment maintenance and upkeep, regularly inspect equipment status, and promptly repair or replace it. Additionally, operator training and management should be enhanced to improve operators' skill levels and safety awareness, thereby preventing faults caused by improper operation.

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