Microfibrillated Cellulose

Surface Morphology

Controlled deposition of these fibrils modifies the topographical profile of a substrate during the wet end phase of production. By applying the material through a spray or size press, mills achieve a smoother finish that accepts ink with higher precision and lower mottle. This layer closes the voids that otherwise cause bleed through in low density sheets.

Precise control over the fibril concentration during application remains the variable that determines opacity and smoothness. High retention rates on the wire ensure that the additive remains within the structure rather than washing away with the whitewater. Operators monitor the hydration state of the pulp to adjust the flow rate, ensuring the resulting web maintains uniform mechanical properties throughout the drying section.

Uniform distribution enables converters to use thinner papers without sacrificing the stiffness required for automatic filling lines.

Barrier Performance

Functional coatings utilizing this network material form a dense film that restricts the migration of moisture vapour across the packaging surface. The process relies on the development of an extremely tight crystalline structure that blocks gas diffusion through the paper matrix. Because the fibrils interlock during the evaporation phase, they eliminate the pathways typically available to air or contaminants.

Such chemical free protection allows for the removal of plastic laminates in certain food packaging applications. The barrier remains effective as long as the structural integrity of the fibrillated layer stays intact. Microfibrillated cellulose enhances the physical performance of high quality print substrates by reducing the required adhesive volume while increasing structural rigidity.