Molds & Tooling
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PA6 Short Shot Incomplete Filling
Problem Phenomenon
The end of thin-wall long-flow parts is short of material, and after raising the temperature it is still not filled and signs of degradation appear
Cause Analysis
Although PA6 has good flowability it solidifies fast, and in thin-wall long-flow the front cools and solidifies, sealing the flow path; a too-small gate or improper position causes excessive pressure loss and insufficient filling power at the end
Solution
①Enlarge the gate and move it close to the thick-wall zone; ②Raise mold temperature to delay surface solidification; ③Use multi-stage injection to pass quickly through thin-wall zones, adding gates if necessary; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The main cause of PA6 short shot is fast solidification rather than viscosity; keeping temperature, enlarging gates and shortening flow length restore filling power in three ways; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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