What Are The Ventilation Design Principles

1. Ventilation Land Dimensions

In mould design, proper number and position of vent holes should be set so that the gas can be discharged smoothly. The diameter and depth of the vent holes should be reasonably designed according to the specific conditions of the mould.

2. Perimeter Ventilation Land

Perimeter ventilation land surrounds the mould cavity and should have a minimum width of 0.125 inches and a maximum width of 0.250 inches. Proper perimeter ventilation helps to release air trapped within the cavity during the injection process.

3. Ventilation Placement

Effective ventilation is achieved by placing ventilation directly opposite the gate and at all runner ends and cold well slugs. This strategic positioning ensures that air can escape from the mould cavity as plastic material flows in.

4. Ejector Pin Ventilation

In some cases, ejector pin ventilation may be necessary to allow air to escape.

5. Common Ventilation Depths

Different plastic materials require varying ventilation depths to ensure proper ventilation and prevent air entrapment.