The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro...
Transcript of The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro...
![Page 1: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/1.jpg)
The pulping and p p gdeposition of macro
stickiesstickies
Xi H Ri h d A V ditti H i ChXin Huo, Richard A. Venditti, Hou-min Chang
North Carolina State UniversityD t f W d d P S iDept. of Wood and Paper Science
![Page 2: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/2.jpg)
What are stickies?
Stickies in paper recycling are believed tobe a mixture ofbe a mixture of----Hot melts adhesives
P i i dh i (PSA’ )----Pressure-sensitive adhesives (PSA’s)----Wax ----Coating----Wood derived extractivesWood derived extractives
![Page 3: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/3.jpg)
StickiesStickies
A sticky particleA sticky particle • is typically hydrophobic
i t k d d it bl• is tacky and depositable• often adsorbs particulates/dissolved species
• Examples of adsorbed species might include talc, Calcium Carbonate, Inks, Toners, polymers …
![Page 4: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/4.jpg)
*The actual surface behavior of stickies depends on the adsorbed species.depends on the adsorbed species.
PSA Surface PSA Surface with CaCO3
![Page 5: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/5.jpg)
Stickies-Related Problems
• Product qualityDi t t i *– Dirty spots in paper *
• Operational problemp p– Deposition on machine *
Breaking web– Breaking web
* Affected by adsorbed species Affected by adsorbed species.
![Page 6: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/6.jpg)
Control and Removal Methods for Stickies
– Mechanical removal *– Chemical control *– Use of environmentally benign adhesive
(recyclable adhesive)– Control of waste paper quality– Physical adsorption to paper fibers *y p p p– Others
* Aff t d b d b d i* Affected by adsorbed species.
![Page 7: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/7.jpg)
The effect of pulping conditions on theThe effect of pulping conditions on the size of stickies after pulping
• Objective: how do components present in the pulper affect the size and shape ofthe pulper affect the size and shape of stickies after pulpingA l ti ?• Agglomeration?
![Page 8: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/8.jpg)
List of Furnishes
• Copy Paper, alkaline– CaCO3 (11%)
• Market Pulp +– CaCO3 (11%)
• SW Market Pulp– pH = 5.0, 5.7, 9.5
– Talc (11%)– Clay (11%)
• Bristol Paper– 2% Rosin, 4% Alum,
10% C i i S h
– Sized with AKD– Cat Starch (1.5 & 10%)
Alum (4%)10% Cationic Starch – Alum (4%)
All furnishes contained 0.5% acrylate based PSA.All furnishes contained 0.5% acrylate based PSA.
![Page 9: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/9.jpg)
Pulping Experiment Procedure :Pulping Experiment Procedure : 400 g OD Pulp2 g adhesive
PULP12%K, 40 C
HANDSHEETSDyeing
30 min Image Analysis
![Page 10: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/10.jpg)
Dyeing Stickies for Contrast EnhancementDyeing Stickies for Contrast Enhancement
Wire or HS
Morplas Blue - Heptane Dye Solution
![Page 11: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/11.jpg)
Apogee Image Analysis SystemHP ScanJet 4C600 dots per inchThreshold: 80% Avg. GSV
Image Analysis:Threshold: 80% Avg. GSVBoth sides of 4 PM Wires
![Page 12: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/12.jpg)
Effect of Papermaking Components on Stickies Average Size After Pulping (Maelstrom Pulper)g p g ( p )
C CO3(11%) Mk
Talc(11%)+Mkt
Starch(1.5%)+Mkt
CaCO3(11%)+Mkt
pH5.0+Mkt
Rosin/alum/starchIn bristol Paper
Market Pulp
pH9.5+Mkt
Copy
Market Pulp(pH=5.7)
0 1 2 3Average Size (mm2)
![Page 13: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/13.jpg)
Effect of Papermaking Components on StickiesAverage Size after Pulping ( 450H Pulper)
AKD Sized Paper
Rosin/alum /StarchBristol paper
Rosin (2%)+ Mkt)
Starch (10%)+Mkt
Alum (4%)+Mkt
Rosin (2%) Mkt)
Market Pulp
0 0.5 1 1.5 2 2.5 3Average Size (mm2)
![Page 14: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/14.jpg)
MARKET PULP COPY PAPER
![Page 15: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/15.jpg)
Effect of Paper Making Components on the Shape Stickies
Market Pulp (pH=5, 5.7,9.5)Clay
Copy PaperRosin/alum/starchClay
CaCO3
Mkt Pulp w/ Cat. StarchMkt Pulp w/ Talc
![Page 16: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/16.jpg)
A closer look at polymer adsorptionA closer look at polymer adsorption on stickies agglomeration
T d t d th f th t bili ti f– To understand the process of the stabilization of stickies (prevention of agglomeration or deposition) by starchdeposition) by starch.
![Page 17: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/17.jpg)
• Objective– To understand the process of the stabilization of– To understand the process of the stabilization of
stickies (prevention of agglomeration or deposition) by starch.p ) y
![Page 18: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/18.jpg)
Experimental ProcedureExperimental Procedure
0.2 gram of PSA particles (collected
Deionized water
g p (
from reject of lab screen)
Poly-DADMAC or starchy
45oC for 8 hours
![Page 19: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/19.jpg)
PSA Particle Aggregates (no chemicals)
![Page 20: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/20.jpg)
PSA ParticlesGentle StirringGentle Stirring
(0.05% Cat Starch solution)
![Page 21: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/21.jpg)
Concentration and Charge of Poly-DADMAC
Poly-DADMACPoly DADMACConcentration
(g/liter) Charge
(µeq/liter) Result
0 0 A l t0 0 Agglomerate4.83E-5 0.3 Agglomerate6.44E-5 0.4 No agg. 9.66E-5 0.6 No agg. 1.45E-4 0.9 No agg. 2.42E-4 1.5 No agg.2.42E 4 1.5 No agg.4.84E-4 3.0 No agg.
![Page 22: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/22.jpg)
Effect of Starch Stabilization onEffect of Starch Stabilization on PSA Particles
3
3.5
4
Parti
cles
Starch 700 (cationic starch w ithDS=0 043)
2
2.5
3
e of
PSA
Pm
msq
)
DS 0.043)
Starch 500 (cationic starch w ithDS=0.021)
Starch OP (neutral starch)
0 5
1
1.5
erag
e Si
ze (m Poly-DADMAC (DS=1)
PVSK (DS=1)
0
0.5
-5 0 5 10
Ave
Dosage of Polymer (% of OD fibers)
![Page 23: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/23.jpg)
Stickies deposition on papermachineStickies deposition on papermachine fabric
• Objective: determine how components present in the pulper affect the deposition ofpresent in the pulper affect the deposition of stickies on papermachine fabric
![Page 24: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/24.jpg)
Deposition Procedure:Deposition Procedure: 400 g OD Pulp400 g OD Pulp2 g adhesive
PULP12%K 40 C
DEPOSITION0 5%K 50 C
PM WiresDyeing12%K, 40 C
30 min0.5%K, 50 C30 min
DyeingImage Analysis
![Page 25: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/25.jpg)
Stickies Deposition TesterStickies Deposition Tester
Papermachiewirewire
![Page 26: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/26.jpg)
Stickies Deposition Tester
Motor
Stickies Deposition Tester
Motor
GGears
Paddle
Water Bath
![Page 27: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/27.jpg)
Stickies Deposition (Weight Method) for Various Papermaking Components (Maelstrom Pulper)g ( )
Clay(11%)+Mkt
Starch(1 5%)+Mkt
CaCO3(11%)+MktTalc(11%)+Mkt
pH5 0+Mkt
Rosin/Alum/Starch in Bristol Paper
Starch(1.5%)+Mkt
Market Pulp(pH=5 7)
pH9.5+Mkt
pH5.0+Mkt
Copy
Market Pulp(pH=5.7)
0 0.1 0.2 0.3Mass of Deposits (g)
![Page 28: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/28.jpg)
Stickies Deposition (Weight Change) for Various Papermaking Components (450H Pulper)Papermaking Components (450H Pulper)
AKD Sized Paperp
Rosin(2%)+ Mkt
Alum (4%)+MktSecondFirst
Starch(10%)+Mkt
0 0.05 0.1 0.15 0.2Mass of Deposits (g)
![Page 29: The pppgulping and deposition of macro stickies - TAPPSA · The pppgulping and deposition of macro stickies ... ----Wax ----Coating ... deposition of the stickies very effectively](https://reader030.fdocuments.us/reader030/viewer/2022021505/5ad9e7b37f8b9a53618bdbda/html5/thumbnails/29.jpg)
Major Findings:
• The stickies will self-agglomerate in pulper without the interference of chemical additives
• Components in copy paper like cat starch p py p pcan disperse the stickies and make them more string-like g
•Cationic starch, alum and talc can prevent , pdeposition of the stickies very effectively