Molds & Tooling
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Shrinkage Prediction Deviation of Cast Polypropylene Film Products
Fenómeno do problema
The shrinkage prediction during mold design does not match the actual shrinkage, resulting in dimensional deviation of the product.
Análise das causas
(1) The shrinkage value taken is inaccurate; the shrinkage of cast polypropylene film is usually 1.0-2.0%
(2) The wall thickness of the product affects the shrinkage; thick walls shrink more
(3) The shrinkage in the flow direction is different from that in the perpendicular direction
(4) Processing parameters (temperature, pressure) affect the actual shrinkage
(5) Additives or fillers affect the shrinkage
Solução
(1) Correct the shrinkage 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 through mold trials
(4) Stabilize the processing parameters to reduce shrinkage fluctuations
(5) For filled products, consider the influence of the filler on shrinkage
Conclusão principal
Shrinkage prediction needs to be determined comprehensively in combination with material characteristics, product structure, and process parameters.
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