Injection Molding
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Multi-stage Injection for PS Products
Problem Phenomenon
Single-speed injection causes many defects.
Cause Analysis
Different filling stages require different speeds; multi-stage injection can balance appearance and internal stress.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
①Adopt a multi-stage injection profile; ②Low speed in the initial stage to prevent jetting; ③High speed in the middle stage for filling; ④Decelerate in the final stage to prevent overpacking.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Multi-stage injection is a basic technology for precision PS molding; the profile design is customized according to the product.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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