Impression Profile
Mechanical creasing of paperboard creates a controlled internal delamination structure that defines the precise hinge position along a carton fold. Within die cutting operations, score line geometry determines the depth, width, and cross-sectional profile of the impression formed in the paperboard sheet.
Bending Torque
A well-formed score line creates a uniform female bead on the reverse side of the board without rupturing the top liner facing or bottom liner layer. Proper profile dimensions allow internal board plies to shear internally and slide past one another, forming a low-resistance hinge when bent at ninety degrees. If the crease impression is shallow or asymmetric, bending resistance increases sharply, causing carton side walls to bulge during automatic box erection.
Excessively deep score profiles fracture the surface fibres, resulting in weak package corners that split under vertical stacking loads. Measuring score line profile parameters with optical cross-section analyzers verifies proper tool geometry prior to high-speed production runs.
Matrix Alignment
Precise alignment between male creasing rules and female matrix channels ensures symmetrical score formation across the web. Misalignment creates uneven shoulder depths that force the paperboard to fold off-center, leading to skewed carton assembly. Regular tooling inspections maintain consistent crease geometry throughout long production runs.
