Developing Strength from Recycled Fibers using Micro Fibrillation, 23TAPPICon
As most have experienced, developing strength properties from OCC, mixed waste and non‐wood fibers have proven to be challenging. Due to the inability to swell hornified recycled fibers or gently fibrillate non‐wood fibers using traditional stator – rotor refiners, meaningful strength properties have proven elusive. To circumvent this challenge, a novel approach takes a side stream of these fibers, using ultra‐fine friction grinders to reduce the fibers down to the nano scale then inject these fibers back into the blend chest. Strength increases from this process have demonstrated 25%+ improvements in tensile, burst and STFI are achievable. This is a variation of Pulmac’s Glu‐Pulp® process that demonstrates both long fibers and now short as well as hornified fibers can be fibrillated to achieve a substantive change like that achieved through chemical additives. This strength enhancement is in part an ESG initiative to produce paper through a more environmentally friendly process.
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