Molds & Tooling
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PA66 fast solidification characteristic
Problem Phenomenon
Gate freezes too fast, insufficient feeding, sink marks in thick-wall areas; or premature solidification at the flow end causing short shots
Cause Analysis
PA66 solidification time is extremely short; improper gate position and size close the feeding channel early; fast solidification is a double-edged sword: short cycle but narrow feeding window; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Gate hole diameter not less than half the product wall thickness; ②hot runners can use smaller gates to prevent premature freezing; ③submarine gate minimum diameter 0.75mm; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PA66 fast solidification determines gate design logic; gate size guarantees feeding, hot runners prevent early freezing, these are two iron rules of mold design; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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