How to deal with holes in the pellets and broken strips of material discharged from the die of a common twin-screw granulator?

1. Causes of holes in the pellets: gas (steam), poor plasticization

Solutions:

1. Check whether the vacuum is normal--(gas);

2. Check whether the decomposition temperature of each component matches the processing temperature;

3. Check whether the water content of each component is normal--(steam);

4. Check whether the system is in an "over-lubricated" state--(poor plasticization);

5. Check whether the shearing of each section of the screw is appropriate--(poor plasticization);

6. Check whether the melting temperature of the material matches the processing temperature--(poor plasticization);

7. Check whether the main engine speed is too fast--(poor plasticization).

2. Causes of holes in material particles: impurities, gas (steam), poor plasticization, pressure

Solutions:

1. Check whether there are impurities--(impurities);

2. Whether the filter is suitable--(pressure, impurities);

3. Check whether the vacuum is normal--(gas);

4. Check whether the decomposition temperature of each component matches the processing temperature--(gas);

5. Check whether the water content of each component is normal--(steam);

6. Check whether the system is in an "over-lubricated" state--(poor plasticization);

7. Check whether the shearing of each section of the screw is appropriate--{poor plasticization, impurities (carbonization)};

8. Check whether the melting temperature of the material matches the processing temperature--{poor plasticization, impurities (carbonization)};

9. Check whether the main engine speed is too fast--(poor plasticization).