Extrusion & Post
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Extruded PEEK pipes crack due to large internal stress
Problem Phenomenon
Extruded pipes/rods crack on their own after placement
Cause Analysis
Cooling too fast after extrusion causes a temperature difference between the surface layer and the core, producing quenching stress; the volume effect of PEEK crystallization shrinkage; inconsistent internal and external cooling rates
Solution
Use segmented gradient cooling (hot→warm→cold) instead of direct cooling; post-anneal the product at 250°C/2h to eliminate stress; control the matching of extrusion speed and cooling speed
Key Takeaway
Annealing treatment is the most effective method to eliminate internal stress in PEEK products
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