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The materials and function of screw head tip set


The screw head of an injection molding machine is a critical component that plays a key role in the plasticization and injection process. It is responsible for melting, mixing, and conveying the plastic materials to create the final molded product.

The material used for the screw head is typically high-quality alloy steel or tool steel. These materials offer excellent mechanical properties such as high hardness, wear resistance, and thermal stability. They can withstand the high temperatures and pressures involved in the injection molding process, ensuring durability and reliable performance.

The working principle of the screw head involves several stages. First, the plastic pellets or granules are fed into the hopper, where they are gravity-fed into the screw channel. As the screw rotates, it creates friction and heat, causing the plastic material to melt.

Next, the molten plastic is compressed and mixed as it travels along the length of the screw channel. This thorough mixing helps to create a homogenous melt with consistent properties. The screw head also incorporates a check valve or non-return valve to prevent backflow of the melt during the injection phase.

Once the plastic is fully melted and mixed, the screw head moves forward, injecting the melt into the mold cavity under pressure. This injection phase requires precise control of speed, pressure, and volume to achieve accurate filling and form a high-quality molded part.


The screw head of an injection molding machine is made from high-quality alloy steel or tool steel. Its primary function is to melt, mix, and convey the plastic material, facilitating the injection molding process. Understanding the material and working principle of the screw head is crucial for optimizing the injection molding process and ensuring consistent production of high-quality plastic parts.




Contact: Richard Wang

Phone: 15372657153

Tel: +86-15372657153


Add: No.1807, R&D Park C Zone -12, Guanghua Road, Hi-Tech District, Ningbo, China

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