Hydrating kraft pulp to 78-84 degrees Schopper-Riegler via low specific edge load refining eliminates paper porosity to achieve grease resistance without chemical additives.
Dynamic strain rate hardening increases Z-direction stiffness during high-speed die cutting, demanding wider matrix channels to prevent crease cracking.
Calculate crease matrix width by multiplying uncoated cartonboard caliper by 1.5 and adding rule thickness, setting channel depth equal to board caliper.
Optimizing shoe press peak pressure and wet-end couch solids maximizes inter-ply bond strength in multi-ply recycled fiber formations.
Selecting steel creasing rules and matrix channels for coated FBB requires matching board caliper and CTMP core shear limits to prevent surface cracking.
Select matrix channel width equal to 1.5 times board caliper plus creasing rule thickness to achieve controlled internal ply delamination without liner cracking.
Optimizing creasing rule tip radius and channel geometry enables controlled internal board delamination, eliminating coating cracking and springback jams.
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