Air vents are the small holes in the land area that allow air to pass through them but don't allow melt to escape out. Providing air vents will reduce the resistance at the time of filling which will reduce the filling pressure and which will result in reducing the residual stresses in molded part. The reduced filling pressure will prevent the breaking of core pins. Air vents also helps to carry out the volatile constituents or gas generated from melt thus improving the quality of molded product.
Design Consideration
