Molds & Tooling
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Shrinkage Rate Prediction Deviation of general purpose polystyrene Products
Fenómeno del problema
The shrinkage rate predicted during mold design does not match the actual shrinkage rate, resulting in product dimensional deviation.
Análisis de la causa
（1）The shrinkage rate value taken is inaccurate; the shrinkage rate of general purpose polystyrene is usually 0.3-0.6%
（2）The product wall thickness affects the shrinkage rate, and thick walls shrink more
（3）The shrinkage rates in the flow direction and the perpendicular direction are different
（4）The processing parameters (temperature, pressure) affect the actual shrinkage rate
（5）Additives or fillers affect the shrinkage rate
Solución
（1）Correct the shrinkage rate value according to the 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 the processing parameters to reduce shrinkage rate fluctuation
（5）For filled products, consider the influence of the filler on the shrinkage rate
Conclusión clave
Shrinkage rate prediction needs to be comprehensively determined in combination with material characteristics, product structure, and process parameters.
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