Injection Molding
4 views
Short Shot of PEEK
Problem Phenomenon
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.
Cause Analysis
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.
Solution
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.
Key Takeaway
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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!