Material Analysis
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PP Part Low-temperature Drop Fracture
Fenómeno del problema
PP turnover boxes and containers fracture at corners on drop in winter or low-temperature environments, yet pass tests at room temperature.
Análisis de la causa
Homopolymer PP has poor low-temperature toughness; stress concentration areas like corners crack brittlely more easily at low temperature; weld lines passing through corners further weaken them; improper grade selection is the root cause.
Solución
①Select impact copolymer PP grades for low-temperature use; ②add fillets and reinforcing ribs at corners to eliminate stress concentration; ③avoid weld lines passing through stressed areas like corners; ④perform drop verification under actual low-temperature environment; ⑤if necessary, switch to more low-temperature-resistant materials.
Conclusión clave
For PP low-temperature drop fracture, first modify the structure (fillets, reinforcing ribs, weld line avoidance), then change the grade (impact copolymer); passing at room temperature does not mean passing at low temperature—verification must simulate real use temperature.
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