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Short shot occurs during injection molding of milk warmer
by：Vowin Rapid Prototyping
2023-02-11
What should I do if the short shot occurs during the injection molding of the milk warmer? Shanghai Mulan Injection Molding Factory said that the short shot refers to the phenomenon that part of the end of the material flow is incomplete, or part of the multi-cavity of a mold is not filled enough. There are many reasons for short shots, the common one is that the flow resistance is too large, which affects the fluidity of the melt. So, what should I do if the short shot occurs during the injection molding process of the milk warmer?
1. Poor mold exhaust: Poor mold exhaust will leave a large amount of gas, which will be squeezed by the flow material to generate a high pressure greater than the injection pressure, thereby preventing the melt from filling the cavity and causing short shots. In this case, it is necessary to check whether there is a designed cold slug cavity and whether the position is correct; if the cavity is too deep, we need to add exhaust grooves and vent holes in the short shot part;
2. The temperature of the nozzle is too low: when the nozzle is in contact with the mold during injection molding, the mold temperature will be lower than the nozzle temperature, and the temperature difference is large. If there is no cold material cavity in the mold, it will cause the cold material to solidify after entering the cavity. The molten material behind is blocked and cannot continue to fill the cavity. Therefore, Shanghai Mulan Injection Molding Factory recommends to keep a certain distance between the nozzle and the mold when opening the mold to reduce the influence of the mold on the nozzle temperature;
3. The injection speed is too slow: The injection speed will affect the mold filling speed. If the injection speed is slow, the mold filling will be slow, and the melt will cool easily, causing short shots. In this case, it is necessary to increase the injection speed appropriately.
The above is a brief introduction of Shanghai Mulan Injection Molding Factory about 'what to do if the short shot occurs during the injection molding of the milk warmer'. Shanghai Mulan Injection Molding Factory focuses on the customized business of small household appliances, household beauty instruments, and maternal and child products. The company has served Japanese brands for more than 10 years, and has accumulated one-stop manufacturing solutions such as mold design, mold processing, and injection molding processing. If you want to know more about the technical content of the injection molding process of the milk warmer, please contact us by phone.
1. Poor mold exhaust: Poor mold exhaust will leave a large amount of gas, which will be squeezed by the flow material to generate a high pressure greater than the injection pressure, thereby preventing the melt from filling the cavity and causing short shots. In this case, it is necessary to check whether there is a designed cold slug cavity and whether the position is correct; if the cavity is too deep, we need to add exhaust grooves and vent holes in the short shot part;
2. The temperature of the nozzle is too low: when the nozzle is in contact with the mold during injection molding, the mold temperature will be lower than the nozzle temperature, and the temperature difference is large. If there is no cold material cavity in the mold, it will cause the cold material to solidify after entering the cavity. The molten material behind is blocked and cannot continue to fill the cavity. Therefore, Shanghai Mulan Injection Molding Factory recommends to keep a certain distance between the nozzle and the mold when opening the mold to reduce the influence of the mold on the nozzle temperature;
3. The injection speed is too slow: The injection speed will affect the mold filling speed. If the injection speed is slow, the mold filling will be slow, and the melt will cool easily, causing short shots. In this case, it is necessary to increase the injection speed appropriately.
The above is a brief introduction of Shanghai Mulan Injection Molding Factory about 'what to do if the short shot occurs during the injection molding of the milk warmer'. Shanghai Mulan Injection Molding Factory focuses on the customized business of small household appliances, household beauty instruments, and maternal and child products. The company has served Japanese brands for more than 10 years, and has accumulated one-stop manufacturing solutions such as mold design, mold processing, and injection molding processing. If you want to know more about the technical content of the injection molding process of the milk warmer, please contact us by phone.
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