When designing the mold, the gate location and size requirements are relatively strict, and the gate size needs to be further modified after the initial mold trial. The opening position of the gate is an important link to improve the quality, and the different gate position also affects the mold structure. In short, in order to make the plastic parts have good performance and appearance, the selection of the gate location must be carefully considered.
The following principles are usually considered:
1. Minimize the flow distance as much as possible.
2. The gate should be opened at the place where the wall thickness of the plastic part is the largest.
3. Weld lines must be minimized.
4. It should be conducive to the discharge of gas in the cavity.
5. Consider molecular orientation effects.
6. Avoid jetting and creeping.
7. Avoid bending and shock loads at the gate.
8. Pay attention to the impact on the appearance quality.