Delamination is a common concern in the production of Flexible Packaging where multiple layers (e.g., polyethylene, foil, and PET) are bonded together to create a crucial barrier against moisture, oxygen, and light. If Delamination occurs, the packaging immediately loses its barrier properties, reducing the shelf life of the food or pharmaceutical product inside. In this failure mode, the layers may separate during the filling process, heat sealing, or even on the store shelf.

In more rigid packaging, such as Mounted boxes (printed sheet on thick cardboard), Delamination is typically evident at sharp edges, folding lines, or due to improper die-cutting. This issue can stem from using inappropriate adhesives, poor settings on the Mounting machine, or a chemical incompatibility between the printing ink and the adhesive. For instance, certain UV-Curable inks or varnish coatings create a chemical barrier that prevents standard adhesives from bonding effectively, resulting in Delamination. Quality tests, such as tensile strength and peeling tests, are absolutely essential for measuring and guaranteeing the bond strength of the layers before initiating mass production.