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Today's Yuhuan Shengjiu Mould Co., Ltd. mainly introduces the related content of how to prevent the occurrence of the mould shrinkage error of the syringe mould:
Since the shrinkage rate changes due to the injection pressure, the cavity pressure in the cavity should be as consistent as possible for a single cavity mould. As for multi-cavity moulds, the cavity pressure between the cavities should be small. In the case of single-cavity multi-gate or multi-cavity multi-gate, the injection pressure must be the same 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 the mould temperature have an effect on the actual shrinkage, when designing the cavity of a precision injection mould, in order to facilitate the determination of the moulding conditions, attention must be paid to the arrangement of the cavity. Because the molten plastic brings heat into the mould, the temperature gradient distribution of the mould is generally around the cavity, in 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 moulding conditions, and reduce costs. . The arrangement of the mould 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.
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