Fibre Cohesion
Paper sheet integrity during saturation involves wet tension as the primary measure of residual strength while water penetrates the internal structure. Fibres lose their initial bonding force when submerged, yet chemical additives or specific refining techniques maintain the hold between these cellulose chains. This property determines how a substrate behaves when it encounters moisture, such as during offset printing or liquid packaging filling.
Structural Resilience
Excessive hydration triggers a reduction in the distance between fibres, which forces the network to reorganize under mechanical load. A sheet with low values for this metric breaks upon the application of minimal stress in a saturated state. Machines moving the paper through a press or across a coating head monitor these limits to prevent web breaks.
High quality kraft boards demonstrate superior resistance to tearing during secondary processing because their internal cross-linking persists despite fluid exposure.
Production Boundary
Controlled laboratory testing requires a constant immersion duration and a specific mechanical pull rate to generate consistent results. Deviations in these two variables produce outcomes that fail to represent the actual material limit. Industrial standards define the threshold for acceptable performance by documenting the force at which the specimen separates.
A verified outcome provides the basis for selecting appropriate sizing agents or sizing levels within the papermaking recipe to ensure the finished product withstands the rigors of its application environment.
