Starting from the roots to reduce sticking box failure (4)

Instable cardboard

Another reason for the failure of the adhesive box is the lack of secure lamination between the two layers of laminated paperboard layers. The general performance of the joint seam, 100% of the seam fibers fracture. Peeling the cardboard at the splicing section shows that the peeled part is the part that is most vulnerable to the connection. Each layer in the laminated paperboard is like the chain link in the chain, and the direct result of the damage is the most vulnerable section. It is adhesive failure. If the double-paperboard indented fibers are found to be smooth and break without "paper fluff", the problem of weak adhesion between the paperboard layers can be concluded. If separation occurs between layers in a multi-ply paperboard layer, "paper fluffs" will appear and the most effective bonding between the layers will not occur.