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China syringe mould Manufacturer, Supplier & Yuhuan […]
China syringe mould Manufacturer, Supplier & Yuhuan Shengjiu Mould Co., Ltd. mainly introduces how to prevent the occurrence of mold shrinkage error related to the syringe mold:
Since the shrinkage rate will change due to the injection pressure, the cavity pressure in the cavity should be as consistent as possible for single cavity molds. As for multi-cavity molds, the cavity pressure between the cavities should be small. In the case of single-cavity multi-gate or multi-cavity multi-gate, the same injection pressure must be injected to make the cavity pressure uniform. For this reason, it is necessary to ensure that the gate positions are balanced. In order to make the cavity pressure in the cavity consistent, it is better to keep the pressure at the gate entrance uniform. The equilibrium of the pressure at the gate is related to the flow resistance in the runner. Therefore, the runner should be balanced before the gate pressure reaches equilibrium.
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, the temperature gradient distribution of the mold is generally around the cavity, and has a concentric circle shape centered on the main channel.
Therefore, design measures such as flow channel equalization, cavity arrangement, and concentric circle arrangement centered on the mainstream channel are necessary to reduce the shrinkage error between the cavities, expand the allowable range of molding conditions, and reduce costs. . The arrangement of the mold cavity of the precision syringe should meet the requirements of equalization of the flow channel and the arrangement of the main channel as the center, and the cavity arrangement must be adopted with the main channel as a symmetrical line.