Molds & Tooling
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Shrinkage rate prediction deviation of styrene-acrylonitrile copolymer products
Problem Phenomenon
The shrinkage rate predicted during mold design does not match the actual shrinkage rate, causing product dimensional deviation.
Cause Analysis
(1) The shrinkage rate value is inaccurate; the shrinkage rate of styrene-acrylonitrile copolymer is usually 0.4-0.7%
(2) Product wall thickness affects shrinkage rate; thick walls shrink more
(3) Shrinkage rates differ between the flow direction and the perpendicular direction
(4) Processing parameters (temperature, pressure) affect the actual shrinkage rate
(5) Additives or fillers affect the shrinkage rate
Solution
(1) Correct the shrinkage rate value according to product structure and wall thickness
(2) Consider the shrinkage difference between the flow direction and the perpendicular direction
(3) Verify the actual shrinkage rate through mold trials
(4) Stabilize processing parameters to reduce shrinkage rate fluctuation
(5) For filled products, consider the influence of fillers on the shrinkage rate
Key Takeaway
Shrinkage rate prediction needs to be comprehensively determined by combining material characteristics, product structure and process parameters.
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