Summary of melt pump faults

The common main faults of melt pumps are:

1. The melt pump does not rotate; 2. Material leakage occurs; 3. The temperature rise of the melt pump is too high; 4. The pump makes a noise during use; 5. Unstable outlet pressure; 6. The product has bubbles; 7. The product has black spots, etc. Here is the solution given:

Melt gear pump malfunction

1. The shaft and sleeve are locked, and the solution is to disassemble, return to the factory, and repair.

2. The temperature has not reached the melting temperature of the material, and continuous heating and insulation are required for a period of time.

3. The motor torque is not enough, replace it with a larger motor and increase the reduction ratio.

Polymer melt pump leaking material

1. Leakage at the sealing point. The solution is to pass cooling water or air; Replace the packing and seal.

2. Cover plate leakage. The solution is to tighten the cover plate screws once after the melt pump is heated; Apply high-temperature sealant to the cover plate and pump body.

Extrusion melt temperature rise too high

1. The thermocouple is damaged, the heating tube is damaged, and the instrument needs to be replaced.

2. There is a problem with the pump body structure.

3. Insufficient smoothness of the melt pump.

4. The material viscosity is too high, causing a high temperature rise.

5. Add cooling to the melt pump, forced cooling, and cold air cooling.

6. Replace straight teeth with helical teeth.

Abnormal noise from the melt pump

1. Friction sound between shaft and sleeve.

2. Friction sound between shaft and seal.

3. Motor sound.

4. The sound of the gearbox.

Unstable outlet pressure

1. Perform closed-loop control.

2. Adopting a pulsation free melt pump.

3. Adopting a more precise driving system.

4. The effect of temperature on pressure.

5. Increase or decrease inlet pressure and change process conditions.

The product has bubbles

1. Dry and exhaust the front-end equipment of the pump.

2. Increase inlet pressure.

3. Check the air tightness of the pump shaft end.

4. Check the mechanism of the pump.

The product has black spots

1. Improve the smoothness of the pump to prevent materials from staying in the pump for a long time and causing carbonization; Ensure that the accessories are free of rust spots.

2. The pump body has no sharp angles and a streamlined shape, with an internal design without dead angles.

3. Install a screen changer to filter impurities upstream.

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