Fiber Morphology Characterization in Recycled Packaging Substrates
Automated optical morphology testing under ISO 16065-2 quantifies fiber shortening and hornification to control secondary substrate strength and yield.
Kink Frequency
Structural Integrity
Mechanical deformation along the primary axis of a cellulose fibre determines the kink frequency within a pulp sheet. This characteristic refers to the number of abrupt changes in fibre orientation per unit length of the material. Such localized bending arises during high consistency processing steps or heavy mechanical refining treatments.
Manufacturers measure this metric to predict how individual fibres behave during subsequent sheet consolidation and drainage operations.
Processing Impact
Refining energy directly alters the count of these deformations. Higher mechanical loads force pulp fibres into sharper curvatures that weaken their tensile potential. A stock preparation system monitors these structural changes to avoid excessive fiber damage that leads to poor bond density in the final paper product.
Excessively high values indicate that pulp treatment exceeded the threshold for preserving fiber length and wall thickness.
Performance Expectation
Print media and packaging substrates rely on standardized fibre morphology for consistent machine runnability. Paper strength properties decline when fibre kink frequency reaches a point where the load distribution across the web becomes uneven. Fibres with fewer deformations maintain better contact area within the lattice.
Consistent control of this measurement ensures that the sheet maintains elasticity without sacrificing the dimensional stability required for high speed converting.