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The ply bond test measures the energy required to delaminate a multiply board structure. Results are quoted in mJ.
Scott internal bond strength testing is included in Smithers' Paper Proficiency Service.
A drawback of the Scott ply bond test is that it often causes delamination towards the centre of the board structure, and not always at the weakest ply bond.
To assess the liner strength of carton boards and corrugated liners for various packaging applications including machine carton erection, Smithers have developed a liner cleavage test which measures the force to pull a rod through the weakest ply bond.