Molds & Tooling
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Shrinkage rate prediction deviation of high impact polystyrene products
Fenómeno do problema
Shrinkage rate prediction during mold design does not match the actual shrinkage rate, causing product dimensional deviation.
Análise das causas
(1) Inaccurate shrinkage rate value; high impact polystyrene shrinkage rate usually 0.4-0.7%
(2) Product wall thickness affects shrinkage rate; thick walls shrink more
(3) Different shrinkage rates in flow direction and perpendicular direction
(4) Processing parameters (temperature, pressure) affect the actual shrinkage rate
(5) Additives or fillers affect the shrinkage rate
Solução
(1) Correct the shrinkage rate value according to product structure and wall thickness
(2) Consider the shrinkage difference between flow direction and perpendicular direction
(3) Verify the actual shrinkage rate through trial molding
(4) Stabilize processing parameters, reduce shrinkage rate fluctuation
(5) For filled products, consider the effect of fillers on shrinkage rate
Conclusão principal
Shrinkage rate prediction needs to be comprehensively determined in combination with material characteristics, product structure, and process parameters.
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