Liner Blocking: When Coated Rolls Stick to Themselves

You rewind your liners, palletize them, and ship. But when the customer opens a roll—or you unwind it for converting—something’s wrong.

The liner sticks to itself. Sheets won’t separate cleanly. Release force spikes. Coating starts to tear.

This is liner blocking, and it’s one of the most misunderstood storage-related failures in the release liner world.

What causes blocking?
– High humidity adhesive or interacting with silicone chemistry
– Tightly wound rolls with excessive pressure and no relaxation time
– Elevated storage temperatures, especially in warehouses or containers
– Residual crosslinking in the silicone that continues post-winding
– Using liner-on-liner packaging without slip interleaving
– Double side coated liner, and the two silicone layers are interacting
– Excessive electrostatic loads

Blocking doesn’t just cause surface damage—it can:
– Create inconsistent release performance
– Jam automatic dispensers
– Lead to misfeeds or label lift during high-speed application
– Introduce dust or tearing when manually separated

How to prevent blocking:
– Let freshly coated rolls cool and relax before winding tightly or packing
– Control RH and temperature in storage and shipping areas
– Use anti-block additives or slip-treated liners for roll-to-roll contact
– Implement interleaf film or staggered winding for sensitive jobs
– Avoid stacking coated rolls flat—store them vertically or with airflow gaps
– Blocking is friction that became failure.

Are your liners built—and stored—for stability?