Introduction:

As a toy manufacturer, having high-quality plastic toy moulds is important for producing toys efficiently and cost-effectively. The structural design of the molds has a significant impact on the quality of the final plastic parts. We are a leading Toys Mould Manufacturer in Gujarat, India. In this blog post, we’ll overview some of the basic requirements and considerations for the structural design of plastic injection molds for toys.

Strength and Durability: 

The mold must be able to withstand high injection pressures and temperatures as well as demolding forces when ejecting the part after cooling. The material used, often tool steel, must have high strength and hardness properties. The thickness of the core and cavity blocks must be sufficient to prevent deflection or warping.

Precision: 

The mold cavity and core blocks must align precisely and the shut surfaces must mate cleanly to avoid flash or leakage of material. High machining precision and surface finishes are required. Guide pillars, leader pins, and bushings must have tight tolerances.
Cooling System: Effective cooling channels need to be designed into the core and cavity to quickly bring down the temperatures and solidify the molten plastic. This helps reduce cycle times and improves part quality. Strategic placement of channels and vents is critical.

Ejector Design: 

Ejector pins, blades, and sleeves should be positioned optimally to cleanly de-mold the part without deformation. There should be adequate surface area contact for a clean release.

Draft Angles and Radii: Adequate draft angles and filet radii should be incorporated into the part and toys mould design to facilitate the demolding of the plastic part after cooling. Standard draft angles range from 1-5 degrees.

Automation: Consideration should be given to automating functions like ejection, mold opening/closure, and lubrication to improve efficiency and minimize operator involvement.

Accessibility: The mold should be designed for easy access to internal components for maintenance, repair, and cleaning. This includes access to water lines, bushings, ejector assemblies, etc.

Conclusion:

The structural design of plastic molds requires careful consideration of many factors - the forces involved, machining accuracy, cooling requirements, part ejection, and automation among others. While complex, having an optimized mold structure helps ensure the production of high-quality toy parts efficiently and consistently. At R.D. Mould & Industries, our experienced engineering team pays careful attention to mold design to meet the tight tolerances and quality standards our toys require.