Hydrating kraft pulp to 78-84 degrees Schopper-Riegler via low specific edge load refining eliminates paper porosity to achieve grease resistance without chemical additives.
Refining top ply stock heavily while leaving base furnish coarse optimizes linerboard strength without severe wet-end dewatering penalties.
Multi-ply layering of post-consumer containerboard optimizes flexural stiffness and crush resistance by concentrating long fibers in outer faces.
Controlled low energy refining of middle ply mechanical pulp yields superior Z direction tensile development without caliper loss in multi ply boxboard.
Splitting recycled furnish into long and short fractions before refining concentrates mechanical energy on long kraft fibres, cutting power use while boosting compression.
Fractionating recycled furnish prior to low-consistency refining preserves boxboard caliper while meeting internal bond targets at reduced energy consumption.
Fibre length degradation in recycled boxboard reduces sheet stiffness and score integrity, requiring chemical bonding additives or higher basis weight to preserve performance.
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