Extrusion & Post
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HDPE pipe extrusion
Problem Phenomenon
HDPE pipe inner wall is rough, wall thickness is eccentric, and the pressure resistance test fails
Cause Analysis
Poor alignment of the pipe extrusion die head causes wall thickness eccentricity; uneven melt temperature affects the inner wall quality; improper sizing and cooling makes the roundness out of tolerance; haul-off speed fluctuation thins the pipe wall
Solution
①Precisely adjust the coaxiality of the die head and core; ②uniform sizing sleeve cooling; ③closed-loop stable haul-off speed; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The wall thickness uniformity of HDPE pipe is the basis of pressure resistance; the three systems of coaxiality, cooling and haul-off are precisely coordinated; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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