Fold Resistance
Quantitative analysis defines the structural integrity of board material along a pre-weakened channel through the application of specific mechanical force. Crease measurement evaluates the resistance offered by the substrate to bending at the hinge point. This procedure determines the force required to create a permanent deformation under controlled velocity and angle.
Standard protocols govern the distance between the two clamping jaws to ensure consistency across varying calipers.
Torque Dynamics
Deflection tests measure the opposing force generated by the internal fibres when the carton moves into a folding position. A sensor records the peak load during the initial displacement as the board attempts to return to a flat state. Engineers calibrate the arm travel speed to mirror the high speed operation of a typical filling line.
Excessive stiffness here results in machine jamming or damage to the external print surface during assembly. Insufficient resistance leads to carton collapse or poor squareness in the finished package. Accurate data collection requires samples cut precisely perpendicular to the grain direction to eliminate variability from the pulp orientation.
Application Tolerance
Consistent output depends upon the relationship between the board thickness and the geometry of the steel rule used for the scoring process. Converters adjust the depth and width of the female die channel based on the results obtained from these bench tests. Operators monitor the gap between the male and female elements to maintain the depth of the valley without fracturing the surface liners.
Production teams establish upper and lower bounds for the opening force to guarantee smooth performance on automatic packing equipment. Strict adherence to these numerical limits prevents the cracking of coatings during the transformation of flat blanks into retail containers.
