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Considerations for the design of plastic bottle cap moulds
2019-12-20
Planning bottle cap mold requirements depends on the shape, accuracy, size, technical requirements and production volume of the plastic parts. When planning the mold, consider the following aspects:
a. Number of cavities and placement method: bottle caps as packaging Containers are produced in large quantities, and one mold and multiple cavities should be selected. Considering the clamping force, injection volume, and precision and economic factors of the existing injection molding machine, it is determined to be 1 mold and 10 cavities. The cavity placement method is "figure" ".
b. Gating system planning: According to the layout of the plastic part, the mold is planned to be a three-plate type using point gates. The gates are set at the center of the top of the plastic parts. The point gate can significantly improve the melt shear rate and make the melt viscosity large. In order to lower the mold filling, the melt-sensitive melt such as PE is particularly useful. Moreover, plastic parts are used as packaging containers with high appearance quality requirements and small residual traces at the gates, which can ensure the surface quality of the plastic parts. The gates are actively broken at the time of demolding, which facilitates the initiative of the production process and improves the production. Power, increasing economic benefits. The non-equilibrium casting system is used to compact the cavity and reduce the mold size. In order to make the various cavities overflow in a balanced manner, the selection method is manually adjusted to reach the balance of the cavity gate size. Use cold pockets to store forward cold stock.
c. Cooling system planning: The mold temperature adjustment system of the bottle cap mold directly affects the product quality and output power. In order to improve the cooling power of the cavity, a cooling circuit is selected. The inlet of one circuit is located adjacent to the outlet of the other circuit. According to the shape of the plastic part and the constraints of the mold layout, the diameter of the fixed mold cooling channel is φ12mm, which is connected with the hose outside the mold to form circulating cooling . The diameter of the moving model core is relatively thin. The steel pipe cooling method is used. A soft copper core rod with good thermal conductivity is pressed in the middle of the core, and one end of the core rod is extended into the cooling water hole to cool.
a. Number of cavities and placement method: bottle caps as packaging Containers are produced in large quantities, and one mold and multiple cavities should be selected. Considering the clamping force, injection volume, and precision and economic factors of the existing injection molding machine, it is determined to be 1 mold and 10 cavities. The cavity placement method is "figure" ".
b. Gating system planning: According to the layout of the plastic part, the mold is planned to be a three-plate type using point gates. The gates are set at the center of the top of the plastic parts. The point gate can significantly improve the melt shear rate and make the melt viscosity large. In order to lower the mold filling, the melt-sensitive melt such as PE is particularly useful. Moreover, plastic parts are used as packaging containers with high appearance quality requirements and small residual traces at the gates, which can ensure the surface quality of the plastic parts. The gates are actively broken at the time of demolding, which facilitates the initiative of the production process and improves the production. Power, increasing economic benefits. The non-equilibrium casting system is used to compact the cavity and reduce the mold size. In order to make the various cavities overflow in a balanced manner, the selection method is manually adjusted to reach the balance of the cavity gate size. Use cold pockets to store forward cold stock.
c. Cooling system planning: The mold temperature adjustment system of the bottle cap mold directly affects the product quality and output power. In order to improve the cooling power of the cavity, a cooling circuit is selected. The inlet of one circuit is located adjacent to the outlet of the other circuit. According to the shape of the plastic part and the constraints of the mold layout, the diameter of the fixed mold cooling channel is φ12mm, which is connected with the hose outside the mold to form circulating cooling . The diameter of the moving model core is relatively thin. The steel pipe cooling method is used. A soft copper core rod with good thermal conductivity is pressed in the middle of the core, and one end of the core rod is extended into the cooling water hole to cool.
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