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Paper and board — Determination of internal bond strength
This document specifies a method to measure the energy required to rapidly delaminate a test piece of paper or board. Rupture of the test piece in the “Z” or thickness direction is initiated by a pendulum having a defined mass, moving at a defined velocity.
The procedure is suitable for both single- and multi-ply papers and boards, including coated sheets and those that are laminated with synthetic polymer films. It is particularly suitable for papers and boards that can be subjected to z-direction rapid impacts, impulses or shock loads during printing or conversion.
The test procedure entails the adherence of double-sided adhesive tape to both sides of the test piece under pressure. For this reason, the method is unsuitable for materials that can be structurally damaged by compression or are porous enough to permit migration of the tape adhesive into or through the test piece.
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