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.
ISO 2493 Stiffness
Mechanical Testing
Evaluation of the bending resistance of paper and board requires measuring the force necessary to deflect a clamped test piece through a specified angle. Applying iso 2493 stiffness defines the geometric and mechanical conditions for determining this resistance using a short-span bending method. The standard specifies a bending angle of fifteen degrees or seven and a half degrees over a pre-determined bending length.
This measurement determines how well a carton will resist bulging during filling and distribution. Packaging manufacturers use this standardized value to predict the mechanical performance of their cartons.
Bending Resistance
Fiber orientation and sheet density determine the stiffness of the paperboard in both the machine and cross directions. Multilayer boards maximize this property by placing high-modulus fibers in the outer plies and high-bulk pulp in the core. Testing according to this standard helps board mills optimize their refining and pressing operations to achieve the necessary rigidity.
Consistent stiffness prevents runnability issues on high-speed packaging lines.
Force Accuracy
Accurate measurements demand precise calibration of the load cell and the angular deflection mechanism of the testing instrument. Modern testers automate the clamping, bending, and recording phases to eliminate operator influence on the final value. Stating the specific bending length used is essential because this parameter directly influences the calculated bending resistance.