1. Frequent stoppages;

2. Conversion of high temperature materials and low temperature materials;

3. Screw plating off, bad plastic head;

4. After the shutdown, PP material is not used for pipe protection;

5. Production of fireproof material, PBT material, PC material, etc.;

6. Screw deformation and barrel friction;

7. The temperature control equipment is bad, and the display temperature is lower than the actual temperature.

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