Molds & Tooling
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PP Cold Slug Mark
Problem Phenomenon
【Problem Phenomenon】Cold slug marks on PP surface, front section disorder
Cause Analysis
Nozzle temperature is low or cold slug well is insufficient; cold material at the front enters the cavity; during on-site troubleshooting, 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
Match nozzle temperature with the front section; enlarge the cold slug well; increase injection speed; 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
For PP cold slug marks check nozzle and cold slug well; 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 problems in the future
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