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

2. 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):

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

4. 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

5. Increase of the Tensile Index after Polyelectrolyte Modification
BEKP
NBSK

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

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

8. Increase of the Storage Modulus after Polyelectrolyt Modification

9. Thank you for Listening.
Contact information:
Dr. Stephan Daus,
Dr. Nikita Polikarpov, I