Proper Venting in an Injection Mold is critical to producing quality parts.  The size, location, and amount of Venting required for proper molding, varies with part geometry and the material used.  Flow analysis can be used to predict approximate venting locations.  Typically the mold maker, during mold tryout, will develop the vents based on CAE fill analysis.   Minimal venting should be at the last point of fill and at weldlines.

    Proper Venting will eliminate short shots and burn marks on parts due to trapped gasses not being vented properly.  Venting will also provide for even flow of the material.  Venting of the Cold Slug Well also improves the melt flow into the cavity.

Venting Guidelines at Parting line shutoff, vents are increased beyond the shutoff.