纳尔科化学品

Challenges and New Technologies Related to Increasing Filler Content in Graphic Papers
Qinglong Rao, Yulin Zhao and Weiguo Cheng Nalco Shanghai Technology Center 11/10/2010


Outline
• Effects of Fillers on Sheet Properties
– Filler Content – Filler Type – Challenges of Increasing Filler Content
• Effects of Nalco FillerTEKTM Technology on Sheet Properties
– Pilot machine study – Case Study of Commercial Application
• Summary
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Fillers in Papermaking
• Fillers were introduced into papermaking for improving sheet properties
– Optical properties – Printing quality – Smoothness
• Fillers are significantly cheaper than fibers • Dramatic size difference between filler and fiber
– – – Fillers have much larger specific surface area Interference with fiber-fiber bonding Interference with wet-end chemicals
• • • Retention aids Sizing agent Strength agent 3
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Why Is High Filler Content Desired?
• Fiber substitution -> cost savings
Pulp Price in US ($/tonne)
1000 SBSK 900 NBHK
– Kraft 850$/ton; – PCC 100$/ton
800
• Energy savings • Sheet performance
– formation, printability, brightness, opacity, smoothness
700
600
500
400 1/3/2008
6/1/2008 10/29/2008 3/28/2009 8/25/2009 1/22/2010 6/21/2010
Time
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Challenges for Increasing Filler Loading
• Low Strength of Dry Sheet
– Filler interferes with fiber-fiber bonding – Dry strength agents do not work due to the interference from filler
• Poor Machine Runnability
• Low wet web strength
– Press picking
• Filler Retention and Sheet Formation
– Fillers are harder to retain – Increased use of retention chemicals leads to poor formation
• Economics
– Possible bulk loss – Expensive filler treatment program
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Nalco FillerTEKTM
Based on the ability to increase filler particle size in a controlled manner and reduce the interference with fiberfiber bonding
20 Untreated PCC
Volume Percentage (%)
16
Prefloc PCC
12
8
4
0 0.1 1 10 100 1000
Particle Size (µm)
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Effects of FillerTEKTM on Sheet Properties Pilot Machine Trial conditions
EuroFEX gap-former pilot machine at Innventia Machine speed: 1000 m/min Grade: 75 gsm sheet at 20%, 25% and 30% ash levels Furnish and Additives •Furnish: 85/15 eucalyptus (26 SR) / pine (22 SR) •Untreated or Prefloc. Syncarb F0474-GO dispersed PCC Omya •7.5 kg/ton Cargill 35844 C* bond starch •4.5 kg/ton Tinopal NP OBA •6 kg/ton Nalco 74003 AKD •Nalco CORE SHELL
®
74553 cationic flocculant (dosage varied)
•5 kg/ton Nalco POSITEK 3G 8699 microparticle
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Effects of FillerTEKTM on Sheet Strength Pilot Machine Trial
• The ash level can be increased by 9 points without a loss in internal bond strength as measured by Z-directional Tensile (ZDT).
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Effects of FillerTEKTM on Sheet Opacity Pilot Machine Trial
• Opacity loss with prefloc filler can be recovered with a 5 point filler increase.
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Case Study I of Commercial Application
• UCFS 75 gsm
– 10% broke, 63% HWK and 27% SWK – PCC/GCC Blend. – Initial Ash Level 18% 18%ASH
• FillerTEKTM has been running across all grades for over one year
18% untreated filler
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22.5% prefloc. filler
10

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