Molds & Tooling
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LLDPE rotomolding bubbles
Problem Phenomenon
Internal bubbles in LLDPE rotomolded parts
Cause Analysis
Insufficient powder melting and venting; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Optimize heating time and temperature; mold venting; powder quality; after adjustment, continuously sample 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
Rotomolding bubbles rely on process and venting; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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