Extrusion & Post
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PET recycled textile
Problem Phenomenon
Uneven dyeing of rPET spun fabrics
Cause Analysis
Recycled bottle flakes come from complex sources; differences in viscosity and hue cause poor spinning and dyeing uniformity; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Use bottle flakes graded by viscosity and hue; add chain extenders to increase viscosity; dyeing process adaptation verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
rPET spinning requires raw material grading plus process adaptation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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