Molds & Tooling
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PPO Pin Gate Blockage
Problem Phenomenon
PPO small-gate precision parts show gate blockage and filling fluctuation, pressure loss at the pin gate is large, and gate marks are obvious.
Cause Analysis
The high-viscosity PPO melt has great resistance passing through the small pin gate; an undersized gate diameter aggravates shear and pressure loss; cold slugs block small-bore gates; process fluctuation amplifies gate sensitivity.
Solution
①Appropriately enlarge the pin gate diameter; ②finely control the gate area temperature to prevent premature freezing; ③optimize the injection speed profile; ④switch to a fan gate or flat gate if necessary.
Key Takeaway
PPO pin gates must have enlarged diameters as industry experience; small gates and high viscosity are a natural contradiction; re-evaluating the gate form is often more thorough.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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