1 The disc gate extends along the outer circumference of the product, and its feeding point is symmetrical and the mold filling is uniform, which can eliminate the seam line and is beneficial to exhaust. The nozzle is usually removed by punching, and the punching process should be paid attention to when designing.

The fan-shaped gate gradually becomes larger from the runner to the cavity, which is suitable for long or thin products and can reduce the flow pattern and directional stress. The fan angle is determined by the shape of the product, and the cross-sectional area of the gate should not be greater than that of the runner.

The annular gate extends along the whole outer circumference of the product, which can make the plastic evenly fill the mold around the core, exhaust well and reduce the bonding line. But the gate is not easy to cut off, which is suitable for thin-walled long tubular products.