Extrusion & Post
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Low burst pressure of PET extruded pipes
Problem Phenomenon
The burst pressure of PET extruded pipes in pressure testing is lower than design requirements.
Cause Analysis
Pipe wall thickness is uneven or has weak points; weld lines (die head spider marks) have insufficient strength; material IV is on the low side; haul-off over-stretches.
Solution
Optimize the die head to reduce weld lines; control wall thickness uniformity; select high-IV raw materials (≥0.80); optimize haul-off speed.
Key Takeaway
PET pipe burst strength depends on wall thickness uniformity and material intrinsic viscosity.
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