... packing. The addition of fillers to the plastic can increase the strength of the productbut will also affect the shrinkage factors, usually reducing them. This meansthat the size of the product ... in theirretainer plates, there is little wear to expect. But even under the bestconditions, after the mold is in operation for a long time, the clearance in the bores will increase, and the ... extent. In general, the strength of plastic in the direction of flow isgreater than in the direction across the flow. Near the gate, when the plasticflows in all directions, the strength is relatively...