Material Analysis
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HDPE pipe crystallization difference after sag
Problem Phenomenon
Sampling from different sections of the same large-diameter pipe shows differences in crystallinity and mechanical properties.
Cause Analysis
Large-diameter pipes have a long production cycle and large cooling rate differences between the inner and outer walls; crystallization is 90% complete within one week after processing, and different cooling histories cause inconsistent crystallinity and performance across sections.
Solution
①Optimize the cooling gradient for uniform inside and outside; ②test the crystallinity of thick-walled pipes in sections; ③control the environment storage temperature for stable crystallization; ④conduct full-size performance verification for critical applications.
Key Takeaway
The crystallization difference of thick-walled pipes is an inevitable result of the cooling history; uniform cooling and sufficient aging are the main means to narrow inter-section differences.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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