Molds & Tooling
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PA66 short shot troubleshooting route
Problem Phenomenon
Thin-wall long-flow parts are underfilled at the ends, and still not fully filled after raising temperature and pressure, with degradation appearing
Cause Analysis
Although PA66 has good fluidity, it solidifies extremely fast, and the flow front solidifies early after the flow length ratio exceeds the limit; too-small gates cause large pressure loss, and raising temperature can only alleviate but approaches the degradation red line
Solution
①Raise melt temperature, mold temperature, and injection pressure and speed; ②Enlarge gates and runners; ③Recalculate the flow length ratio and increase the number of gates if necessary; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
The root cause of PA66 short shots is mostly in flow length ratio and gates; process compensation has an upper limit, and structural modification is the thorough solution; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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