Mold is a very important industrial product. The qualit […]
Mold is a very important industrial product. The quality of a mold is experienced in many ways. As a manufacturer, we should know which properties can affect the performance of the mold produced.
The processing properties that affect the mold design are: shrinkage, fluidity, crystallinity, heat sensitivity, thermal performance and curing characteristics.
The shrinkage rate of the soft elastomer determines to a large extent what the product can achieve, affects the design of the mold gating system and the molded part, and sometimes determines the injection molding process method and mold category. The fluidity of the material has many influences relative to the detailed design of the mold. The fluidity is related to the size of the shear ladder at various points of the flow channel during the flow process, which affects the orientation and thus the change of the shrinkage rate.
Crystallization is usually for thermoplastic elastomers with crystallinity. Thermosetting plastics, some thermoplastics, and rubber have varying degrees of sensitivity to heat during the injection molding process. The heat here has good meanings for mold design: shear heating and long-term heating. The length of the heating time is mainly related to whether the runner designer is reasonable and whether it can greatly reduce the resin stagnation and residence 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 thermosetting plastics and rubber affect the design of mold heating and washing.