Paperboard Crease Bending Resistance Evaluation Standard Laboratory Test Protocols
Crease evaluation measures 15-degree sheet stiffness against 90-degree fold resistance, targeting a 30 to 50 percent ratio to prevent cartoning line jams.
Paperboard Caliper and Rule Width Selection Formulas for Creasing Matrix Channel Optimization
Matrix channel width equals creasing rule thickness plus board caliper multiplied by grade constants ranging from 1.4 for SBB to 1.7 for WLC.
Calculating Crease Matrix Dimensions for Uncoated Folding Cartonboard
Calculate crease matrix width by multiplying uncoated cartonboard caliper by 1.5 and adding rule thickness, setting channel depth equal to board caliper.
Coated Folding Boxboard Crease Quality Audit Procedures
Crease audits verify internal mechanical ply shear through moment ratios between thirty and fifty percent without top coating fracture under dye staining.
Creasing Rule Selection for Coated Folding Boxboard Conversion
Selecting steel creasing rules and matrix channels for coated FBB requires matching board caliper and CTMP core shear limits to prevent surface cracking.