Molds & Tooling
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Poor label adhesion on PET bottles
Problem Phenomenon
After labeling, the label lifts, bubbles, or falls off, and there is white haze, oil stains, or condensation water on the bottle body surface, affecting product appearance.
Cause Analysis
There is mold release agent residue, white haze, or rough areas on the bottle body surface, which reduces the wetting adhesion of the label adhesive; condensation water on the bottle body and surface defects also destroy the fit.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Standardize the use of mold release agent and keep the bottle surface clean; ②eliminate white haze and rough defects on the bottle surface; ③control the bottle body temperature before labeling to avoid condensation; ④select a matching label adhesive.
Key Takeaway
Label problems mostly originate from the bottle surface condition rather than the labeling machine; keeping the bottle surface clean and dry and eliminating surface defects are the prerequisites for improving the label adhesion pass rate.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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