Injection Molding
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LDPE Shrinkage Dominated by Cooling Time
Fenómeno do problema
Adjusting injection pressure has limited effect on improving LDPE shrinkage, while the influence of cooling time is immediate.
Análise das causas
Taguchi experiments confirm: the most significant factor for LDPE shrinkage is cooling time, followed by holding pressure, with injection pressure having the least influence; this is contrary to most people's machine-tuning intuition.
Solução
①For shrinkage problems, optimize cooling time first; ②Next adjust holding pressure; ③Injection pressure has the least influence on shrinkage and need not be adjusted first; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusão principal
The correct order for LDPE shrinkage management is cooling, holding, injection; design of experiments data overturns the priority of experience-based machine tuning; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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