Air traps

the reason:

1. The injection speed is too fast.
2. Back pressure is too high.
3. Insufficient gas, gas encapsulation.
4. The flow channel size is too small.
5. The melt temperature is too high and it is necessary to reduce the shear.

Solution:

1. Reduce the injection speed.
2. Clean the air trap in the trapped position.
3. Reduce the clamping force.
4. Reduce the pressure of holding pressure.
5. Reduce the speed of the screw.

6. Reduce the melting temperature.