Processing Machinery
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PET recycled sheet
Problem Phenomenon
rPET sheet gel particles and odor exceed standards
Cause Analysis
Recycled material contains impurities such as label glue and bottle caps; incomplete washing and sorting leaves residues that degrade and produce odor; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Improve washing and sorting precision; extrusion high-vacuum venting and devolatilization; increase filtration mesh; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
rPET sheet quality depends on washing, sorting and devolatilization; 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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