Injection Molding
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LDPE Shrinkage Dominated by Cooling Time
Problembeschreibung
Adjusting injection pressure has limited effect on improving LDPE shrinkage, while the influence of cooling time is immediate.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
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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