Resistance Force
Force applied perpendicular to a substrate plane defines structural bending stiffness. This mechanical property measures the internal resistance of paper or board to deformation when bent across a specific span. It quantifies how much load the material sustains before reaching a predetermined angle of deflection.
Manufacturers certify this value to ensure cartons maintain their shape during stacking and high speed filling.
Conversion Tolerance
Converting machinery handles materials based on how the stock reacts to mechanical pressure during folding or erecting. Precise values inform the design of scores and creases to prevent cracking or board fracture under mechanical stress. A sheet with high values requires deeper scoring to avoid surface splitting during the transition from a flat blank to a box.
Operators adjust suction timing and vacuum levels on folding units when these figures fluctuate outside the established baseline.
Testing Parameter
Standard test methods utilize a controlled arm or pendulum to apply a load at a fixed distance from the clamped edge of a sample. These protocols specify the orientation of the grain and the width of the specimen to ensure consistent results across different batches. Sensors record the force required to deflect the sample to an angle of fifteen degrees from its original position.
A higher resistance value indicates a stiffer sheet that provides greater protection for contents but requires higher force to process. Total structural bending stiffness dictates the load bearing capacity of the final package structure under static pressure.
