1. Disc-shaped gate: The material is extended along the outer circumference of the product. The feed point is symmetrical and the filling is even, which can eliminate the bonding wire. Conducive to exhaust. The nozzle is often removed by punching and the punching process is designed.
2. Fan-shaped gate: It gradually enlarges in a fan-shaped direction from the runner to the cavity. It is suitable for long or flat and thin products, which can reduce flow lines and directional stress. The fan angle is determined by the shape of the product. The cross-sectional area of the gate must not be greater than the cross-sectional area of the runner.
3. Ring gate: The glue is extended along the entire outer circumference of the product. It can make the plastic around the core evenly filled, and the exhaust is good, reducing the joint line. But the gate removal is difficult, it is suitable for thin-walled long tubular products.
4. Point gate: It is a gate with a small cross-sectional area, such as a needle. It is generally used for plastics with good flow. The gate length does not exceed the diameter of the gate. Therefore, the gate is automatically cut off after demoulding, and no further correction is required. The gate marks are not obvious. In the box cover, box shell and large area products in a wide range of applications, it can make a mold to add a mold surface, easy water outlet stripping. The disadvantage is that it is easy to cause pressure loss due to the small size of the sprue, and some defects (flow marks, scorch, black spots) are formed during molding. Its shape is diamond, single-point, double-point, multi-point and so on.
5. Side gate: It is generally set on the side of the mold. The parting surface is filled with glue from the inside or the outside, and the cross section is mostly rectangular, which is suitable for a multi-cavity mold.