How to prevent the injection mold from forming shrinkage errors
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Today's editor mainly introduces to you how to prevent the molding shrinkage error related content of syringe mould. Since the shrinkage rate will change due to the injection pressure, for single-cavity molds, the cavity pressure in the cavity should be as much as possible. Unanimous. As for the multi-cavity mold, the cavity pressure between the cavities should be very small. In the case of a single cavity with multiple gates or multiple cavities with multiple gates, injection must be made with the same injection pressure to make the cavity pressure consistent. For this reason, it is necessary to ensure that the gate position is balanced. In order to make the cavity pressure consistent in the cavity, it is best to keep the pressure at the gate entrance consistent. The pressure balance at the gate is related to the flow resistance in the runner. Therefore, before the gate pressure reaches equilibrium, the runners should be balanced.
Because the melt temperature and mold temperature have an effect on the actual shrinkage rate, when designing the cavity of a precision injection mold, in order to facilitate the determination of the molding conditions, attention must be paid to the arrangement of the cavity. Because the molten plastic brings heat into the mold, and the temperature gradient distribution of the mold generally surrounds the cavity, which is in the shape of concentric circles with the main runner as the center.
Therefore, design measures such as runner balance, cavity arrangement and concentric circular arrangement centered on the main runner are necessary to reduce the shrinkage error between the cavities, expand the allowable range of molding conditions, and reduce costs. The cavity arrangement of the precision syringe mould should meet the requirements of balance of the runner and the arrangement of the main runner as the center, and the cavity arrangement with the main runner as the line of symmetry must be adopted.
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