Problems and Improvement Methods in the Molding Site: Methods for Improving Dimensional Accuracy

The shrinkage rate of crystalline resin is 1% to 2%. How does the mold dimension affect the product?

I will explain how the dimensions of the mold affect the product. The shrinkage rate of crystalline resins is about 1% to 2%, while for amorphous resins, it is about 0.2% to 0.5%. Just by looking at this, you can understand that amorphous resins have an advantage in terms of dimensional stability. A lower shrinkage relative to the mold dimensions means that the product can be produced in a shape closer to that of the mold. In contrast, crystalline resins have a larger shrinkage rate, making them more prone to variations in product dimensions. Currently, even for products made from the same material, the shrinkage rates specified by different molding companies to mold manufacturers vary. One point to be cautious about is that the shrinkage rate calculation method provided by material manufacturers is based on very general molding assumptions. In cases of thick walls or complex shapes, these assumptions may not hold, so each molding manufacturer accumulates their own know-how or makes adjustments to mold dimensions and molding conditions, and we respond accordingly. *For more details, please refer to the PDF document or feel free to contact us.*

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