Material Analysis
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rPET Bottle Black Speck Impurities
Problem Phenomenon
Tiny dark impurity dots are visible on the 100% rPET bottle wall, and high-end packaging receives complaints.
Cause Analysis
Recycled PET raw material contains trace residual impurities from previous use; the filtration precision of the regeneration process is limited, and impurities are conspicuous on transparent bottle walls.
Solution
①Improve the filtration precision of recycled material; ②agree with the customer on impurity acceptance standards (e.g. quantity upper limit for <0.5mm); ③control the rPET ratio for high-transparency applications; ④strengthen incoming material inspection.
Key Takeaway
rPET impurities = the upper limit of the regeneration process; standards agreed in advance.
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