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What is the way to feed plastic molds

writer:LI SONG Share

In industrial production, various presses and special tools installed on the press are used to make metal or non-metallic materials into parts or products of the required shape through pressure. These special tools are collectively referred to as molds, which are indispensable for plastic injection molding machines. Few accessories.

What is the way to feed plastic molds?
1. Side gate
The side gate of the plastic mold is generally opened on one side of the mold, and the parting surface is filled from the inside or the outside. 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 inclined and lurks on the parting surface. (Shanghai Plastic Mold) can automatically cut off the pin point gate when the glue is inserted on the side or inside of the product, which is suitable for automated production.

3. Ring gate
The annular gate of the plastic mold expands along the entire outer circumference of the product to feed the glue. It can make the plastic fill the mold uniformly around the core, have good exhaust, and reduce the bonding line, but it is difficult to remove the gate. It is suitable for thin-walled and long-tube products.

plastic mold
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 and the mold is evenly filled. It can eliminate the bonding line and facilitate exhaust. The nozzle is usually removed by punching, and the punching process should be paid attention to when designing.

5. Direct gate
The direct gate of the plastic mold enters the cavity from the main runner. It is suitable for single-cavity deep-cavity shell-shaped and box-shaped molds. The runner process is short, the pressure loss is small, and it is good for exhaust, but the removal of the gate is inconvenient and will leave obvious marks. .

6. Fan gate
The fan gate of the plastic mold gradually enlarges from the runner to the cavity and becomes a fan shape. It is suitable for long or flat and thin products. It can reduce the flow pattern and directional stress. The fan angle is determined by the shape of the product. The cross section of the gate should not be larger than the flow. Road section area.

7, point gate
The point gate of a plastic mold is a gate with a small cross-sectional area like a needle. It is generally used for plastics with better flow. The length of the gate generally does not exceed its diameter. Therefore, the gate is automatically cut after demolding and no 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 and facilitate the ejection of the nozzle.

A mold is a tool for producing plastic products and is used on an injection molding machine. It is composed of several groups of parts, and there is a molding cavity in this combination. During injection molding, the mold is clamped on the injection molding machine, the molten plastic is injected into the molding cavity, cooled and shaped in the cavity, and then the upper and lower molds are separated, and the product is ejected from the cavity and out of the mold through the ejection system, and finally the mold is closed For the next injection, the entire injection molding process is carried out cyclically.

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