Understanding and Managing Shrinkage Rates in Plastic Mold Design

In the field of plastic mold design and manufacturing, accurate knowledge of shrinkage rates is crucial to ensure the precision and quality of the final product. Shrinkage rates can vary significantly based on the type of plastic material used, the size of the product, and the thickness of the material. Here, we delve into the critical factors affecting shrinkage rates and provide detailed data and insights based on years of practical experience.

Key Factors Influencing Shrinkage Rates

1. Product Size and Material Thickness:
2. Shrinkage Rates of Different Plastic Materials:

Shrinkage Rate Reference for Various Plastics

Practical Shrinkage Rates for ABS Material

Different types of products using ABS material exhibit varying shrinkage rates. Here is a breakdown based on real-world applications:

Product TypeActual Mold Shrinkage RatePrinter shell, car audio panel, Samsung remote control lower cover0.0045500X35X30 DVD surface0.0035Mobile phone case, medical equipment, electrical box, kitchen supplies0.005Keycap0.003VTech handset bracket0.0025Electrical housing5/1000Automotive parts (export)0.6%Controller box0.015Shell with IML process0.003LCD frame0.0035

Important Considerations

1. For products exceeding 300mm in size, add 0.0005 to the base shrinkage rate.
2. For products with significant differences in length, width, and height, calculate the shrinkage rates separately for the X, Y, and Z axes.
3. Pay special attention to products with an average material thickness that is very thick or very thin (below 0.5mm) and for large-sized products.

Conclusion

In summary, accurately understanding and managing shrinkage rates in plastic mold design is essential to ensure the quality and precision of the final product. By leveraging practical experience and detailed data, we can make informed decisions and adjustments to avoid production issues and achieve the desired outcomes.

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By sharing this knowledge and data, we aim to help professionals in the field make better-informed decisions, ensuring high-quality outcomes in their plastic mold design and manufacturing processes.