When the molten material flow does not completely fill the cavity in the mold, a short shot occurs, resulting in the incomplete molded parts after cooling. This effect is usually far away from the gate, especially when it involves a long flow distance, thin wall (or combination), or molded parts filled with polymer, resulting in functional or visual defects of the product.
So how can we solve the problem of this injection product?
Common causes may be:
1. Insufficient material injected
2. Insufficient injection filling speed
3. Under pressure
4. Insufficient injection time
5. Unbalanced multi cavity die
6. Foreign matter blocking nozzle
7. Injection temperature too low
8. Gate or vent too small
9. Mold temperature too low
10.Excessive wear of screw and barrel
Solution:
Redesign the mold with a wider channel or gate for better fluidity
Increase injection speed or pressure or select thinner substrate to improve fluidity
Increase mold temperature to prevent material from cooling too fast
Add additional vents or expand existing vents in the mold to allow trapped air to escape
