The processing properties that affect the mold design are: shrinkage, flowability, crystallinity, heat sensitivity, thermal properties and curing characteristics.
The shrinkage rate of the soft elastomer largely determines what the product can achieve, affects the mold casting system and the design of the molded part, and sometimes determines the injection molding process method and mold type. The fluidity of the material has many influences on the detailed design of the mold. The quality of the fluidity involves the size of the shear ladder in the flow channel during the flow process, that is, the orientation and the shrinkage rate.
Crystallization is usually for crystalline thermoplastic elastomers. Thermosetting plastics, some thermoplastics, and rubbers have different degrees of sensitivity to heat during the injection molding process. The heat here has a good meaning for mold design: shear heat generation and long-term heating. The length of the heating time is mainly related to whether the runner designer is reasonable and can greatly reduce the amount of resin stagnation and retention time. The melting point, crystallization temperature, and thermal deformation temperature of thermoplastics and plastic elastomers affect the design of the mold's cold-que system, and the curing properties of thermoset plastics and rubbers affect the design of mold heating and washing.