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How To Design Injection Mold Air Vent?
Original: Original | Author: DGMF Mold Clamps | Publish Time: 2020-07-11 | 8176 Views | Share:
Appropriate opening of the injection mold air vent can greatly reduce the injection molding pressure, injection molding time, holding time, and injection mold clamping pressure, making the plastic parts from difficult to easy, thereby improving production efficiency, reducing production costs, and reducing the energy consumption of the machine.

1. The role of the air vent of the injection mold

The function of the air vent is mainly two points: one is to exclude the air in the injection mold cavity when the molten material is injected; the second is to exclude all kinds of gases generated by the material during the heating process. The more thin-walled products, the farther away from the gate, the opening of the exhaust slot is particularly important.

In addition, for small parts or precision parts, we must pay attention to the opening of the air vent, because it can avoid product surface burns and insufficient injection volume, it can also eliminate various defects of products and reduce mold pollution.

So, what is the exhaust of the mold cavity? Generally speaking, if the melt is injected at the highest injection rate without leaving a focal spot on the product, it can be considered that the exhaust in the injection mold cavity is sufficient.

2. Air vent method of injection mold

There are many ways to evacuate the mold cavity, but each method must ensure that: the air vent is exhausted at the same time, its size should be designed to prevent the material from overflowing into the groove; secondly, it must prevent blockage. Therefore, from the inner surface of the injection mold cavity to the outer edge of the mold cavity, the length of the exhaust groove of 6-12 mm or more, the groove height should be placed about 0.25-0.4 mm.