Injection Molding
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PP Multi-Stage Injection Application
Problem Phenomenon
[Problem Phenomenon] Single injection speed for PP; jetting and short shots alternate
Cause Analysis
Multi-stage injection: slow at the gate to prevent jetting, fast in the middle for filling, slow at the end for venting; finer staging for thin-wall high-speed parts; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Speed curve of three or more stages; slow at the gate, fast in the middle, slow at the end; adjust by structure; 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 multi-stage injection: slow entry, fast middle, slow finish; 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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