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.
Paperboard Anisotropic Hygrothermal Expansion Mechanics in Converting Operations
Paperboard expands five to seven times more across the grain than along it, requiring precise humidity control and pass timing to maintain converting register.
Paperboard Creasing Mechanics and Physical Quality Inspection Fundamentals
Optimizing rule depth and matrix channel width induces internal ply delamination, preventing top liner crack failures during high-speed carton folding.
Managing Paperboard Hygroexpansion and Moisture Balance in Converting Operations
Targeting 5.5 to 6.5 percent board moisture and maintaining 50 percent relative humidity prevents hygroexpansion fan-out, registration drift, and score cracking.
Predicting Interlaminar Shear Shear Breakdown Thresholds in Recycled Multi-Ply Boxboards under Variable Ambient Humidity Conditions
Recycled boxboard interlaminar shear thresholds decay non-linearly above 65% RH due to fiber hornification and starch matrix plasticization.
Virgin SBS against White Lined Chipboard for Retail Facings
Virgin SBS provides superior print brightness, stiffness consistency, and crack-free scoring, whereas recycled board lowers initial cost but adds waste.