Reasons and solutions for low extrusion volume of high-speed injection molding machines

1. The cold air has been turned on for a long time, and the mold surface becomes cold

At this time, we must check whether the rubber material at the mold surface outlet has been plasticized and melted.

2. The starting temperature is too low

At this time, it is necessary to check whether the temperature of each part of the extruder barrel and the die head meets the standard requirements. The external temperature of each part meets the standard, but if the heating time is insufficient, will the heater and thermocouple with inconsistent internal and external temperatures be damaged? If the electrical components are damaged, they should be repaired or replaced immediately.

3. The temperature of the extruder barrel or die head is too high, the screw and barrel in the melting section are worn, the screw is carbonized, and the material is not discharged smoothly.

Check the sensitivity of the temperature controller and deal with it appropriately. The die head temperature controller should use a high sensitivity.

4. The transmission belt is loose or falls off

The old transmission belt should be replaced immediately. The usable one should be installed with an idler wheel and the belt tension should be adjusted to prevent the belt from loosening and falling off again.

5. Glue for screw feeding part

Before each shutdown, the temperature should be slightly lowered, and the machine should be shut down when there is no glue at the screw feeding part. If the screw is stuck by glue after startup, the screw should be cleaned first. If it is really inconvenient to clean, a plastic stick or a wooden stick should be used to squeeze the material downward at the feeding port to move the glue stuck to the screw feeding part forward. At this time, pay attention to the plastic stick or wooden stick being bitten by the screw, or wood chips falling off. Do not use metal sticks.

6. There is glue lumps on the Adam's apple of the feeding barrel

The water temperature of the cooling water jacket of the Adam's apple of the feeding barrel should be controlled below 40C℃. If the filter is blocked, a new filter must be replaced immediately.

7. Back pressure is too low

The phenomenon caused by low back pressure is material instability, which can be corrected by increasing back pressure.

8. The voltage fluctuation of the DC motor is too drastic. Install a voltage stabilizer to ensure voltage stability.

9. The speed of the clamp rod is uneven or the pressure between the rollers is too large.

At this time, check whether the clamp is eccentric and whether the transmission belt is worn or loose and falls off; when the pressure between the rollers is too low, slippage will occur. The air pressure or spring can be adjusted to increase the pressure.

10. Too much recycled material is mixed in

It is necessary to reduce the proportion of powder mixed in. If it is necessary to crush the material without adding recycled materials as much as possible, it is best to make it into granular stable material first.