Difficult investigation
| Anomaly | Reasons | Measures to rule out |
|---|---|---|
| Fluctuations in the feed, under the difficult material | Wet powder Feed screw speed instability, or fluctuations in the density of dry mixture Dry blend poor liquidity I feed the temperature is too high Dry mixture in the hopper into stagnation is expected to open in Canada or the bridge wall hanging I feed or feed screw block |
Dry raw materials, don’t mixture dry damp Voltage stability, thermal stability of the mixed process Dry mixture to improve the mobility of Lower feed or cooling the temperature above the mouth feed Check out the hopper material circumstances Clean-hopper or screw |
| Extruder torque current host or instability, high torque | Uneven quality of the dry mixture The low temperature, non-performing plastics Charging too much, not plastic There are built-in foreign bodies |
Check raw materials and mixing process Improve the heating temperature Loading materials and the adjustment screw speed Inspection and disassembly screw, screw tube |
| Torque decline | Bowl for less than expected Paragraph feed temperature is too high Pressure above the temperature is too low |
Check whether the material hopper, whether or not bridge Reduce the temperature section feed Increase the compression temperature above |
| Among Screw top, die and filter there has some coke material | The higher temperature in Barrel or Divert District Filter plates or large screen resistance Dryblend poor thermal stability |
Reduce heat temperature in the area Clean filter or increase the cross-section for through. Materials dry blend and inspection of the thermal stability |
| Material be break down in the mold , the surface of products have a yellow line break marks | Wen die temperature is too high Materials dryblend and thermal stability The nose on the surface there is depression or plot material Irrational structure die |
Lower die temperature Check raw materials and thermal stability of the mixture quality Check and clean-up nose Dead inside the nose to eliminate, reduce material residence time |