Paper Strength Increase by Using Polyelectrolytes as Promising Alternative to Fibre Beating Stephan Daus (PTS) Trabzon, Octobre 8th 2013

Paper Strength Fibre Modification Concepts Fibre beating common method to increase paper strength  Increased density after beating – Loss of Bending Stiffness High Energy Consumption Alternative Methods Desired Polyelectrolyte Modification (PEM):

Fibre Modification Concepts Pump Pump Modification with Polyelectrolyt Complexes cationicPE anionic PE PEC pulp Sheet formation

Uptake of Polyelectrolytes and Polyelectrolyte Complexes Uptake up to 2 % per g pulp Uptake of polyelectrolytes depends on fibre charge PEM 1 / PEC 1 – cationic and anionic starch PEM 2 / PEC 2 – polyallylamin hydrochloride and polyacrylic acid PEM 3 / PEC 3 – polyamidoamine-epichlorhydrin resin and carboxymethyl cellulose

Increase of the Tensile Index after Polyelectrolyte Modification BEKP NBSK

Strength vs. Fibre Density Tensile Index [Nm/g] Density [g/cm³] reduced density after polyelectrolyte modification increased paper strength

Increase of Polyelectrolyte Uptake is charge dependant can be increased CMC grafting

Increase of the Storage Modulus after Polyelectrolyt Modification

Thank you for Listening. Contact information: Dr. Stephan Daus, stephan.daus@ptspaper.de Dr. Nikita Polikarpov, nikita.polikarpov@ptspaper.de I