Injection Molding
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Short Shot of PEEK
Fenómeno do problema
The ends or thin-wall areas of PEEK products are not completely filled, with rounded edges that cannot be fully formed; short-shot positions mostly occur at thin-wall ribs far from the gate.
Análise das causas
PEEK melt has high viscosity and large filling resistance; when injection pressure and speed are insufficient, the melt front cools and solidifies before reaching the end; low mold temperature and too small gate further aggravate premature freezing.
Solução
①Increase injection speed and injection pressure — high-viscosity material requires high-pressure, high-speed filling; ②Raise the mold temperature to delay solidification; ③Enlarge gate and runner dimensions — the gate of glass fiber grades should not be smaller than 1.5mm; ④Strengthen venting to eliminate air back pressure.
Conclusão principal
PEEK short shot treatment follows the path of temperature first, then pressure, then structure; gate size is a hard constraint for glass fiber reinforced PEEK; high-speed filling must be implemented together with good venting.
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