Injection Molding
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PVDF Product Multi-stage Injection
Problem Phenomenon
Speed profile.
Cause Analysis
PVDF needs smooth filling; prevent jetting and shear heat.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; This mechanism has been repeatedly verified by industry materials, and it should be confirmed first during troubleshooting
Solution
①Multi-stage injection; ②low speed in the initial stage; ③filling in the middle stage; ④deceleration in the final stage.; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
Multi-stage injection is the foundation of precision molding.; 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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