Injection Molding
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LDPE Shrinkage Dominated by Cooling Time
Problem Phenomenon
Adjusting injection pressure has limited effect on improving LDPE shrinkage, while the influence of cooling time is immediate.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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