Processing Machinery
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PP Back Pressure and Screw Speed
Problem Phenomenon
[Problem Phenomenon] Improper PP back pressure and rotation speed cause uneven plasticizing or degradation
Cause Analysis
PP back pressure 5-15MPa ensures uniform plasticizing; medium screw speed avoids shear overheating; PP is relatively insensitive to shear but excessive speed still degrades; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Back pressure 5-15MPa; medium screw speed; increase external heat if plasticizing is insufficient; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP back pressure 5-15MPa and medium screw speed; shear overheating also degrades; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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