Shenzhen Alu Rapid Prototype Precision Co., Ltd.

In injection molding, a gate is the small, precisely designed opening or entry point in the mold that allows molten plastic to flow from the runner system (the channel distributing material) directly into the mold cavity, where the final part forms. 

This restricted area controls the rate and direction of plastic flow to ensure even filling, minimize defects like voids or weld lines, and facilitate easy separation of the solidified runner (scrap material) from the finished part after ejection. 

Gates are typically located at the thickest or least visible sections of the part to reduce cosmetic marks (like gate blush or vestiges). Common types include:

1.Edge gate: Positioned at the part's edge for simple, high-volume production.

2.Submarine (tunnel) gate: Enters from the side or bottom, self-degating for automatic trimming.

3.Pin gate: A small, pinpoint entry for precise aesthetics, often used in hot runner systems.

4.Fan or tab gate: Spreads material over a wider area for better flow in larger parts.

The choice of gate type depends on factors like part geometry, material, and production volume.