Your Choice of Runner Shape can Shape Your Profits
Whenever designing a cold (solidifying) runner system, a decision must be made as to the shape of the runner channels. The most common options for runner shapes are shown in Figure 1. In terms of the preferred shapes, start on the left side and work your way to the right. However, it is not recommended to go much further than the trapezoid shape. The other three runner shapes are inefficient, have no value and will waste a great deal of plastic and energy.
