Paper Strength Increase by Using Polyelectrolytes as Promising Alternative to Fibre Beating Stephan...
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Paper Strength Increase by Using Polyelectrolytes as Promising Alternative to Fibre Beating Stephan Daus (PTS) Trabzon, Octobre 8 th 2013
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Transcript of Paper Strength Increase by Using Polyelectrolytes as Promising Alternative to Fibre Beating Stephan...
Paper Strength Increase by Using Polyelectrolytes as Promising Alternative to Fibre Beating
Stephan Daus (PTS)Trabzon, Octobre 8th 2013
04/21/23
2
Paper StrengthFibre Modification Concepts
PulpCation. Polyel-ectrolyt
Filtrate 2Filtrate 1
Pulp 2nd layerPulp 1st layer
Anion. Polyel-ectrolyt
PulpPulp
Cation. Polyel-ectrolyt
PulpCation. Polyel-ectrolyt
Filtrate 2Filtrate 2Filtrate 1Filtrate 1
Pulp 2nd layerPulp 1st layer
Anion. Polyel-ectrolyt
Pulp Anion. Polyel-ectrolyt
Pulp
Polyelectrolyte Modification (PEM):
• Fibre beating common method to increase paper strength
Increased density after beating – Loss of Bending Stiffness
High Energy Consumption
Alternative Methods Desired
04/21/23
3
Fibre Modification Concepts
1
2
3
45 6
7
8
9
1 10
2
3
45 6
7
8
9
1 1
anionic PEcationicPE
Pump Pump
PEC
Sheet formation
pulp
Modification with Polyelectrolyt Complexes
04/21/23
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 starchPEM 2 / PEC 2 – polyallylamin hydrochloride and polyacrylic acidPEM 3 / PEC 3 – polyamidoamine-epichlorhydrin resin and carboxymethyl cellulose
PAAE / CMC
PAH / PAA
Kat. / anionicStarch
PAAE/ CMC
PAH / PAA
Cat. / anionicStarch
1818
1.5 %1.5 %1.5 %10 %1.5 %10 % StockConsistency
PEM 1 PEM 2 PEM 3 PEC 1 PEC 2 PEC 3
[mg/g] [mg/g] [mg/g] [mg/g] [mg/g] [mg/g]
BEKP 14.6 / 27.6 35 / 35 15 / 15 21
NBSK 9.7 / 18.4 30 / 30 10 / 5.1 21 18 18
PAAE / CMC
PAH / PAA
Kat. / anionicStarch
PAAE/ CMC
PAH / PAA
Cat. / anionicStarch
1818
1.5 %1.5 %1.5 %10 %1.5 %10 % StockConsistency
PEM 1 PEM 2 PEM 3 PEC 1 PEC 2 PEC 3
[mg/g] [mg/g] [mg/g] [mg/g] [mg/g] [mg/g]
BEKP 14.6 / 27.6 35 / 35 15 / 15 21
NBSK 9.7 / 18.4 30 / 30 10 / 5.1 21 18 18
04/21/23
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Increase of the Tensile Index after Polyelectrolyte Modification
BEKP NBSK
0 20 40 60 80 100 120 140 160 1800
20
40
60
80
refined pulp
Ten
sile
ind
ex [
Nm
/g]
Refining energie [kWh/t]
0 20 40 60 80 100
0
20
40
60
80
Ten
sile
ind
ex [
Nm
/g]
Mass PEC/pulp [mg/g]
PEC3 PEC1
PEM3
PEM1
0 20 40 60 80 100 120 140 1600
20
40
60
80
refined pulp
Ten
sile
ind
ex [
Nm
/g]
Refining energie [kWh/t]
0 20 40 60 80 100
0
20
40
60
80
PEC3
PEC1PEM3
PEM1
Ten
sile
ind
ex [
Nm
/g]
Mass PEC/pulp [mg/g]
04/21/23
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Strength vs. Fibre Density
KF_150 kWh/t
KF_100 kWh/t
KF02
LF_180 kWh/t
LF_150 kWh/t
LF0
0
10
20
30
40
50
60
70
0,50 0,55 0,60 0,65 0,70
Rohdichte [g/cm3]
Te
nsi
le-I
nd
ex
[Nm
/g]
Mahlung KFKF_PEM1KF_PEM2KF_PEM3Mahlung LFLF_PEM1LF_PEM2LF_PEM3
PEM-Beschichtung
• reduced density after polyelectrolyte modification• increased paper strength
Density [g/cm³]
Ten
sile
Ind
ex [
Nm
/g]
04/21/23
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y = 0.4307x + 1.3916
R2 = 0.9944
02468
101214161820
0 10 20 30 40 50Surface Charge [µeq/g]
Cat
. S
tarc
h [
mg
/g p
ulp
]
Increase of Polyelectrolyte Uptake
29242962.2CMC-treatedBSKP
6.77.06.013.4UnbeatenFine reduced
BSKP
CMC-treated
Unbeaten
Fine reduced
No
No
Pulp treatment
BHKP
BHKP
BHKP
BSKP
Pulp
14.5111432.1
119.510.522.7
29172964.3
9.68.89.419.6
3 (CS)2 (AS)1 (CS)[µeq/g]
PE-Modification (mg/g) Surface Charge
29242962.2CMC-treatedBSKP
6.77.06.013.4UnbeatenFine reduced
BSKP
CMC-treated
Unbeaten
Fine reduced
No
No
Pulp treatment
BHKP
BHKP
BHKP
BSKP
Pulp
14.5111432.1
119.510.522.7
29172964.3
9.68.89.419.6
3 (CS)2 (AS)1 (CS)[µeq/g]
PE-Modification (mg/g) Surface Charge
Polyelectrolyte Uptake:• is charge dependant• can be increased CMC grafting
04/21/23
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Increase of the Storage Modulus after Polyelectrolyt Modification
0.0 1.0 2.0 3.0 4.0 5.0
BSKP - unbeaten
BSKP - unbeaten + PEM
BSKP - 50 kWh/t
BSKP - unbeaten + CMC + PEM + NFC
BSKP - 100 kWh/t
BSKP + 100 kWh/t + PEM
BSKP - unbeaten + CMC + PEM
Storage Modulus E' (GPa)
BeatingPolyelectrolytesPEM + Beating
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Contact information:
• Dr. Stephan Daus, [email protected]
• Dr. Nikita Polikarpov, [email protected]
Thank you for Listening.
