Extrusion & Post
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Periodic thickness variation appears on the extruded product surface
Problem Phenomenon
Periodic thickness variation appears on the extruded product surface, bamboo-node-like, seriously affecting appearance and dimensions
Cause Analysis
Periodic fluctuation of haul-off speed
Unstable screw speed
Periodic fluctuation of extrusion temperature
Unstable cooling water supply
Unstable haul-off machine clamping force
Solution
Stabilize haul-off speed
Stabilize screw speed
Stabilize extrusion temperature
Stabilize cooling water supply
Adjust haul-off machine clamping force
Key Takeaway
Bamboo-node pattern requires stable haul-off and extrusion parameters
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