underfill
The main reasons for insufficient filling are as follows:
The resin is out of capacity.
Insufficient pressure in the cavity.
The resin is illiquid.
The exhaust is not good.
As an improvement measure, we can mainly start from the following aspects:
1) lengthen the injection time, so as to prevent the resin from filling the cavity due to the short molding cycle, so as to prevent the reverse flow of the resin before gate solidification.
2) increase the injection speed.
3) improve mold temperature.
4) increase the resin temperature.
5) increase injection pressure.
6) enlarge gate size.Generally, the height of the gate should be equal to 1/2 ~ 1/3 of the wall thickness of the product.
7) the gate is set at the maximum wall thickness of the product.
8) set vent (average depth 0).03mm, width 3 ~ SMM) or exhaust rod.More important for smaller artifacts.
9) a certain (approximately SMM) buffer distance is left between the screw rod and the injection nozzle.
10) use low viscosity grade materials.
11) add lubricant.