Injection Molding
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PA6 '2079851475616104452 short shot
Problem Phenomenon
Thin-walled parts and long-flow parts lack material at the end, the short-shot edge is rounded, recurring.
Cause Analysis
PA6 solidifies quickly, and the flow front freezes rapidly at thin walls; insufficient injection speed/pressure, low mold temperature, and poor venting all amplify it; PA6's fast crystallization characteristic makes it sensitive to speed and temperature.
Solution
①Increase injection speed and pressure; ②increase melt temperature and mold temperature; ③enlarge the gate; ④select high-flow grades for thin-walled parts; ⑤open or clean vent grooves at the corresponding positions to ensure smooth gas discharge.
Key Takeaway
PA6 short shot='racing against freezing speed': increasing speed and temperature is the main line; PA6 crystallizes fast and the front freezes easily, so speed and temperature must be given in full, and high-flow grades are a shortcut to solving thin-wall short shots.
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