How to Avoid Overflowing Adhesive and Bubbling of Pressure-Sensitive Labels in Summer?

In summer, with high temperatures and humidity, pressure-sensitive labels often encounter issues during production and use, troubling relevant enterprises and users. Here are some precautions for using pressure-sensitive label materials in summer.

01 Edge Adhesive Overflow
The adhesive layer of pressure-sensitive labels is somewhat fluid and temperature-sensitive. At higher temperatures, its fluidity increases, making adhesive overflow more likely. During material slitting, the edge adhesive varies due to slitting knife differences. Combined with high temperatures, this can cause edge adhesive overflow.

Once adhesive overflows, it can stick to lower material layers, hindering unwinding and printing. To prevent this, when storing unused pressure-sensitive label materials, place release paper between material rolls, silicon oil side against material edges, and avoid stacking too high. Additionally, spray oil-based or neutral release agent on material edges before printing or die-cutting to reduce adhesive residue on rollers. If severe adhesive overflow occurs, reprocess the edges before use.

02 Material Deformation
In summer, changes in air humidity can cause pressure-sensitive materials to lose or absorb water, altering tension and resulting in loose or tight rolls. This also applies to film-based materials, which may develop core bulges.

To address this, minimize pressure-sensitive material inventory and storage time. Store materials at 18 - 28℃ and 40% - 60% humidity. Don't open material packaging until necessary, and reseal unused materials promptly.

03 Die-Cutting Issues
When die-cutting in summer, high temperatures can cause the waste to be ejected together with the labels and adhesive overflow, especially with hot-melt pressure-sensitive materials. This is due to the longer stringing of hot-melt adhesives compared to water-based ones.

To solve this, keep the production site at around 23℃. Eject waste immediately after die-cutting and minimize the number of rolls the material passes through to reduce adhesive backflow. Use die-cutting blades with special coatings when possible. For low-temperature and frozen pressure-sensitive materials, consider freezing them before processing if overflow occurs.

04 Label Bubbling and Wrinkling
Pressure-sensitive labels are often wrapped in plastic bags or heat - shrink film after printing. In summer, after rain, the sudden increase in air humidity can cause labels to absorb moisture, expand, and lead to wrinkling or bubbling.

To prevent this, open the packaging of pressure-sensitive label finished products and let them acclimate with the objects to be labeled for 24 hours before labeling. This helps balance humidity and ensures labeling quality, especially when labeling corrugated boxes.

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