Extrusion & Post
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PVC Profile Extrusion
Problem Phenomenon
Door and window profiles showed dimensional fluctuation, wave marks on the surface, and insufficient welded corner strength
Cause Analysis
PVC profile extrusion has high requirements for temperature and haul-off stability; uneven cooling causes dimensional fluctuation; haul-off speed fluctuation forms wave marks; the formulation lubrication system affects welding quality
Solution
①Equalize temperature of the sizing and cooling system; ②closed-loop stabilization of haul-off speed; ③lubrication system balancing processing and welding performance; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PVC profiles are the representative of extrusion precision; only coordination of the three systems—temperature, haul-off, and lubrication—can achieve stability; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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