Molds & Tooling
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PA66 short shot
Problem Phenomenon
Thin-wall long-flow material shortage, recurring.
Cause Analysis
PA66 melt viscosity is high and solidifies fast; low temperature, insufficient speed, poor venting; high melting point makes the front cool faster; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Increase temperature and speed; ②appropriately raise mold temperature to improve melt replication and fit to the cavity surface; ③appropriately enlarge the gate to reduce shear rate and pressure loss; ④select high-flow grades when necessary to reduce filling difficulty; ⑤open or clean vent grooves at the corresponding positions to ensure smooth gas discharge.
Key Takeaway
PA66 short shot='combination of temperature and speed': high-temperature high-viscosity PA66 needs both temperature and speed given in full; high-flow grades are an effective solution for thin-walled parts.
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