Molds & Tooling
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PPO Multi-Cavity Mold Imbalance
Problem Phenomenon
The cavities of a PPO multi-cavity mold fill inconsistently, some with short shots and some with flash, and product weight and performance vary greatly.
Cause Analysis
PPO's high viscosity is extremely sensitive to differences in flow resistance; runner geometric imbalance is amplified; temperature differences among cavities aggravate imbalance; gate wear is inconsistent.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Balanced runner layout design; ②trim runner size deviations; ③short shot test to verify cavity consistency; ④balanced mold temperature management.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO multi-cavity imbalance is amplified under high viscosity; short shot test is the standard verification means; runner machining accuracy requirements are higher.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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