The water in the aqueous coating is absorbing into the paper causing the distortion. A solution is to use a thinner film of coating or a high solids coating with lower water content. The problem is more common on lightweight papers, thus you can also try a higher basis weight paper.
Grigeo Packaging Installs BOBST Folder-Gluer to Expand Capacity and Future-Proof Business
Leading corrugated manufacturer Grigeo Packaging UAB is a subsidiary company of Grigeo Group, one of the largest paper and hardboard manufacturers in the Baltics. The company has recently invested in an EXPERTFOLD 165 folder-gluer, the fifth BOBST machine to be installed since 2016. It joins a host of other BOBST equipment already used for flatbed die-cutting, flexo post-printing, flexo printing and folding-gluing in the factory.