Molds & Tooling
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Internal stress warpage from too low PP mold temperature
Fenómeno do problema
The warpage defect rate of products produced at a mold temperature below 40℃ increases significantly, and the deformation continues to develop after aging.
Análise das causas
Low mold temperature makes the crystallization rates inside and outside the product inconsistent, and internal stress increases severalfold; uneven crystallization also causes shrinkage differences, and the dual action triggers warpage.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solução
①Increase the mold temperature above 40℃ and keep it stable; ②balance the temperature difference between cavity and core; ③judge dimensions after aging the product for 24 hours; ④control the mold temperature within ±2℃ for precision parts.
Conclusão principal
Mold temperature is the master switch of PP crystallization and stress; the cold-mold process below 40℃ seems to have a fast cycle, but actually comes at the cost of warpage risk.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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