Injection Molding
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Improper temperature gradient in PP '2079851475616104452
Problem Phenomenon
Poor plasticization and degradation appear alternately; the temperature setting is unreasonable.
Cause Analysis
The barrel temperature gradient is not set according to the plasticization characteristics of PP; if the rear zone is too high, premature melting affects conveying, and if the front zone is too high, degradation occurs.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Set a low-rear and high-front temperature gradient according to PP characteristics; ②calibrate by actually measuring the melt temperature; ③stabilize the temperature control of each zone; ④record and verify qualified parameters.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
The temperature gradient is the basic setting of plasticization quality; the actually measured melt temperature is more reliable than the displayed setting.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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