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Injection Mould for Rear Retaining Plate - China Suppliers and Factory Offering High-Quality Solutions

At our China factory, we specialize in producing high-quality molds essential for various molding processes. Our molds are designed with precision, incorporating movable and fixed mold plates, along with ejector pins, return pins, and advanced demolding mechanisms to efficiently eject plastic parts. Our large tailgate molds utilize a three-plate structure, featuring point gates with taper angles ranging from 12° to 30° to enhance filling efficiency. Additionally, inclined guide pins facilitate effective lateral core pulling. As leading suppliers in the industry, we primarily utilize materials such as PP, ABS, and PC/ABS, which offer a perfect balance of strength and weather resistance. For instance, our motorcycle fender molds are manufactured using PP+TD20 to significantly improve rigidity. Trust our expertise and innovative solutions for all your molding needs in China.

Product Details

Product Features

Material Advantages

◎ The P20 steel cavity is pre-hardened to a hardness of 30-36HRC, allowing for direct machining and corrosion resistance; the 45# steel mold base is heat-treated to achieve a tensile strength exceeding 600MPa.

High-Efficiency Molding

◎ The hot runner system is temperature controlled to reduce melt shrinkage and deformation, and combined with the side gate, it achieves uniform filling of multiple cavities.

Precise Cooling

◎ The water-cooling channel design ensures temperature control accuracy of ±0.5℃, preventing product warping.

Reliable Demolding

◎ The pin-type ejector and ejector plate work together to meet the demolding needs of complex structures.

Dual-Groove Adaptation

◎ The right and left teeth are designed independently, compatible with bidirectional threaded products, expanding application scenarios.

Applicable Scenarios

Automotive Parts

Plastic parts that require high surface finish and dimensional stability, such as tailgates and interior trim.

Industrial Parts

Fasteners and connectors with symmetrical threads, such as flanges and brackets.

Daily Necessities

Large containers, shells, and other mass-produced products that require rapid cooling and molding.

Electronic Components

Precision structural parts, using a water-cooling system to ensure low thermal deformation.

General Injection Molding

Suitable for medium to high-volume production of engineering plastics such as PP, ABS, and PA.

Technical Parameters

Cavity material	P20 steel
Core material	P20 steel
Mould base material	45#
Ejection system	Pin ejector and ejection plate
Number of cavity	2 cavities (right + left)
Gate	Hot runner system + Normal side gate
Cooling system	By water

Conclusion

Frequently Asked Questions

Q What material is used for the mold cavity, and what hardness level does it achieve?

The mold cavity is made of P20 steel, pre-hardened to a hardness of 30-36HRC. This pre-hardening eliminates the need for additional heat treatment after machining, allows for direct cutting operations, and provides built-in corrosion resistance — making it ideal for long production runs with consistent dimensional accuracy.

Q How does the hot runner system contribute to better molding quality?

The hot runner system maintains precise temperature control throughout the injection process, keeping the plastic melt at optimal viscosity. This minimizes melt shrinkage and thermal deformation. Combined with the normal side gate, it enables uniform simultaneous filling across multiple cavities, reducing warpage, sink marks, and dimensional variation in finished parts.

Q What temperature control accuracy does the water-cooling system provide?

The water-cooling channel design achieves temperature control accuracy of ±0.5℃. This tight tolerance ensures uniform heat dissipation across the mold surface, effectively preventing product warping, residual stress, and dimensional inconsistencies that commonly occur with inadequate cooling systems.

Q What types of products is this mold suitable for?

This mold is suitable for a wide range of applications including automotive plastic parts (such as tailgates and interior trim), industrial fasteners and connectors with symmetrical threads, daily necessities like large containers and shells, electronic precision structural components, and general injection molding of engineering plastics such as PP, ABS, and PA in medium to high-volume production.

Q What is the ejection system configuration and how does it handle complex structures?

The mold uses a combined ejection system consisting of a pin-type ejector and an ejector plate working in coordination. This dual-mechanism approach provides reliable and even ejection force distribution, making it capable of handling complex part geometries, deep undercuts, and thin-walled structures without causing surface damage or deformation during demolding.

Q What does the dual-groove (right and left teeth) design mean, and what are its advantages?

The dual-groove design means the mold features independently designed right-hand and left-hand thread cavities within the same tool — a 2-cavity layout (right + left). This configuration makes the mold compatible with bidirectional threaded products in a single production cycle, significantly expanding its application scenarios, reducing tooling costs, and improving overall manufacturing efficiency for threaded plastic components.

Plastic mould for bumper