Why do self-adhesive wine labels wrinkle?

Wine label labeling The customer has customized a batch of self-adhesive labels. The customer uses the self-adhesive label made of coated paper. In the processing process, in addition to printing, there are also bronzing and varnishing processes. There were no problems when it was first put on, after 24 hours the label on the bottle started to wrinkle, and over time the label on the bottle got more and more wrinkled.

Analysis of the cause of wrinkling: Since it was the rainy season at that time, the humidity in the customer's workshop was high, and the self-adhesive label was always sealed with a plastic bag before use. Therefore, the moisture content of the label itself is quite different from that of the customer's workshop. The label rapidly absorbs water and swells for a period of time after labeling, causing the label to wrinkle.