Views:7 Author:Site Editor Publish Time: 2021-02-24 Origin:Site
Silicone injection molding machine is used for silicone product molding, Silicone product molding is a kind of process that is suitable for the production of thermoplastic silicone products. The tube blank obtained by extrusion or injection molding is placed in the mold, and compressed air is blown into the tube blank to make it close On the cavity wall.
The injection molding process of silicone products affects the accuracy of the product:
In the production of some important injection molded parts that require more precise dimensions, the allowable range of fluctuations in the dimensions of each part is very small, even requiring only one or two fluctuations.
In the production process, the main factor that usually affects the dimensional accuracy of injection molded parts is the shrinkage rate of injection molded parts. The greater the shrinkage rate, the worse the accuracy. Therefore, because the shrinkage rates of PP and POM injection molded parts are very large, they The accuracy of injection molded parts is usually poor for this reason. The shrinkage of other materials is usually not very small, so the dimensional accuracy of injection molded parts is not very high under general injection molding conditions.
In fact, the shrinkage rate of injection molded parts can be reduced by adjusting the machine, so as to achieve the purpose of improving the dimensional accuracy of injection molded parts. We only need to greatly increase the time and pressure of injection or holding pressure to reduce the shrinkage of injection molded parts. , The shrinkage rate is obviously reduced, and the dimensional accuracy is naturally improved.
Due to the limitation of the quality of the injection molding machine, the injection pressure generally cannot be adjusted too high, otherwise a large number of injections will be generated. Therefore, in the commonly used ordinary injection molding machine, mainly rely on increasing the injection or holding time to achieve the purpose of improving the dimensional accuracy of injection molded parts.
In order to ensure the dimensional accuracy of injection molded parts, the accuracy of the mold is the first condition that needs to be guaranteed, and it is more important to choose a stable, reliable, and adequate pressure injection molding machine for production.