Injection Molding
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PA12 Product Multi-Stage Injection
Problem Phenomenon
Speed curve.
Cause Analysis
Need for smooth filling; prevent jetting and over-packing.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; This mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Multi-stage injection; ②low speed in initial stage; ③filling in middle stage; ④decelerate in final stage.; 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
Multi-stage injection is the foundation of precision molding.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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