Non destructive laser thermoelastic mapping measures subsurface micro delamination dynamics in high speed barrier board scores without damaging surface coatings.
High strain shear during boxboard creasing causes polymer film micro fractures when local elongation exceeds film yield capacity along the outer bend radius.
Selecting steel creasing rules and matrix channels for coated FBB requires matching board caliper and CTMP core shear limits to prevent surface cracking.
Piezoelectric stress wave monitoring detects cartonboard score cracking in real time by capturing high-frequency elastic strain transients at rotary die nips.
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