Injection Mold For Toothbrush Cups

I. Mold Structure Features

Molding Components: According to the shape and size of the toothbrush cup, an integral insert-type concave mold and an integral assembled convex mold are adopted. This design is suitable for small-sized toothbrush cups with simple shapes, ensuring the mold precision and easy replacement.

Gating System: The sprue bushing and locating ring can be designed as an integral structure, and adopt an H7/m6 transition fit with the fixed mold plate. The cross-sectional shape of the sprue usually selects circular, trapezoidal, etc., so as to reduce the pressure loss and heat dissipation loss in the runner.

Guiding and Positioning Mechanism: The guide pillars and guide bushes are usually made of 20# low-carbon steel. After carburizing for 0.5-0.8mm, they are quenched to 48-55HRC, which has good wear resistance and strength, ensuring the mold clamping precision.

Ejection Mechanism: The common one is the ejector pin ejection mechanism. The molded toothbrush cup is ejected from the mold through the ejector plate, ejector pin fixing plate and ejector pins. During the design, the position and quantity of the ejector pins should be considered to avoid damaging the product by ejection.

Cooling System: For the small-sized core, a jet-type cooling method can be used. A water spray pipe is installed in the middle of the core, and the cooling water is sprayed from the top to cool the core wall by diverging around, so as to accelerate the cooling and molding speed of the plastic.

II. Material Selection

• Mold Steel Materials: The mold cavity and core usually use mold steels such as P20, 738H and S136, which have good strength, hardness and corrosion resistance. The hardness of the steel is generally 48-52HRC.

• Other Materials: The gate sleeve is made of T8 and T10, with a heat treatment strength of 52-56HRC; the guide pillars and guide bushes are made of 20# low-carbon steel and undergo carburizing and quenching treatment.

III. Design Key Points

• Cavity Layout: The number of cavities is determined according to the production batch and product size. For example, a multi-cavity layout in one mold can be adopted for mass production, and the common layouts are circular distribution or balanced distribution, so as to ensure the uniform filling of each cavity with plastic melt.

• Parting Surface Design: It should be selected at the part with the largest cross-section of the toothbrush cup without affecting the product appearance. At the same time, the ejection method of the plastic part should be considered, so that the plastic part can stay on the moving mold side after mold opening.

• Shrinkage Compensation: Different plastic materials have different shrinkage rates. For example, the draft angle of the mold cavity for PC material is 35 minutes to 1 degree, and that of the core is 30 minutes to 50 minutes. During mold design, it is necessary to compensate the mold size according to the shrinkage rate of the selected plastic material to ensure the dimensional precision of the product.

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