Lamp Shade

Plasticizing Capacity

The maximum amount of plastic required to fill the mold, including sprue, runner system, and cavities, must be less than 60 to 70% of the shot capacity of the molding machine to ensure proper plasticizing of the raw plastic material. Then, a judgement has to be made aboutwhether the dimensional tolerances of the product will allow multicavity molding within the quality limits imposed by the customer. Many customers now are demanding statistical quality control methods, which call for product to be dimensionally produced with three sigma limits falling within 70% of the tolerance zone.