Extrusion and dispersion coating elongation limits require matching tool tip geometry and board moisture to prevent outer-fiber micro-cracking under scoring press kinematics.
Recycled folding boxboard requires expanding matrix channel width from 1.5 to 1.8 times caliper plus rule thickness to prevent top-liner rupture.
Paperboard expands five to seven times more across the grain than along it, requiring precise humidity control and pass timing to maintain converting register.
Predicting paperboard delamination requires balancing Z-direction shear strength to permit core separation while preventing outer liner tensile fracture.
Cross direction creasing of chemical pulp requires expanding matrix channel width to 1.5 to 1.7 times board caliper plus rule width to prevent liner cracking.
Air-coupled ultrasonic guided waves quantify paperboard crease ply delamination and micro-cracking non-destructively, preventing box compression failure.
Dynamic paperboard creasing requires speed-adjusted tooling channel geometry to prevent barrier micro-fracturing and maintain shelf-life performance.
Evaluating machine direction anisotropy and crease depth ratios in SBS board balances fold integrity against corner springback on high-speed cartoning lines.
Resin yield stress thresholds govern score line micro-elevation profiles, where controlling matrix clearance and coat weight prevents optical edge defects.
Low relative humidity elevates dispersion binder Tg, converting viscoelastic flow into brittle fracture during millisecond creasing and breaching barrier performance.
High strain rate board creasing requires matching tool clearance to middle-ply shear yield to prevent surface fracture.
Wide matrix channels and shallow penetration depth prevent polymer micro-fractures in dispersion-coated folding boxboard during creasing.
Polypropylene lamination crease failure is prevented by expanding female matrix channel width to one point seven times board caliper plus rule thickness.
Matt lamination cracks at the crease because silica matting inclusions reduce film elongation capacity, requiring expanded matrix channels to lower folding strain.
Recycled fibre shortening and hornification limit bending strain, requiring wider matrix channels and virgin top layers to prevent score cracking.
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