Do you know what kinds of glue feeding methods are available for plastic molds?


Author: MULAN -Plastic Molding Manufacturer

A plastic mold is a tool for producing plastic products, and it is also a tool for giving plastic products a complete structure and precise dimensions. Plastic mold injection molding is a processing method used in the mass production of certain complex-shaped parts. Specifically, it refers to injecting heated and melted materials into the mold cavity by high pressure, and obtaining molded products after cooling and solidification. So, what are the ways to feed plastic molds? 1. Side gate The side gate of the plastic mold is generally set on one side of the mold, and the parting surface is filled with glue from the inside or outside, and the cross section is mostly rectangular, which is suitable for one mold with multiple cavities.

2. Latent gate The latent gate of the plastic mold is slanted and hidden on the side of the parting surface. When the product is injected into the side or inside the mold, the pin gate can be automatically cut off, which is suitable for automatic production. 3. Annular gate The annular gate of the plastic mold expands into the plastic along the entire outer circumference of the product. It can make the plastic fill the mold evenly around the core, exhaust well, and reduce the bonding line, but it is difficult to remove the gate. It is suitable for thin-walled long molds. Tubular product. 4. Disc gate The disc gate of the plastic mold expands the feed along the outer circumference of the product. The feed point is symmetrical, the mold is filled evenly, and the joint line can be eliminated, which is conducive to exhaust. The gate is usually removed by punching. When designing Pay attention to the punching process.

5. Direct gate The direct gate of the plastic mold enters the mold cavity from the main channel, which is suitable for single-cavity deep-cavity shell-shaped and box-shaped molds. The flow of the runner is short and the pressure loss is small, which is conducive to exhaust, but it is inconvenient to remove the gate. , will leave obvious marks. 6. Fan-shaped gate The fan-shaped gate of the plastic mold is gradually enlarged from the runner to the cavity to form a fan shape. It is suitable for long or flat and thin products, which can reduce flow lines and directional stress. The fan-shaped angle is determined by the shape of the product. The gate The cross-sectional area cannot be greater than the cross-sectional area of ​​the flow channel. 7. Point gate The point gate of a plastic mold is a gate with a small cross-sectional area such as a needle. It is generally used for plastics with better flow. The length of the gate generally does not exceed its diameter, so the gate is automatically cut off after demoulding. , no further correction is required.

The gate residue is not obvious, and it is widely used in box covers, box shells and large-area products. It can add a parting surface to the mold to facilitate the demoulding of the nozzle. The disadvantage of the point gate of plastic mold is that the small gate is easy to cause pressure loss, and some defects (flow marks, burnt, black spots) will occur during molding. The shapes are diamond, single point, double point, and multi point. wait.

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