Using the Measurement of Colloidal Organics to Relate to Paper Machine Runnability Danny Haynes Eka Chemicals an Akzo Nobel Company an Akzo Nobel Company
Need for On-Line Stickies Monitoring: “Advances in managing and controlling stickies await a good measurement tool similar to the one we have in deinking - measurement of ERIC. We need a fast and reliable instrument for the measurement of the concentration of stickies.” Mahendra Doshi – Editor of Progress in Paper Recycling
Need for On-Line Stickies Monitoring: “Advances in managing and controlling stickies await a good measurement tool similar to the one we have in deinking - measurement of ERIC. We need a fast and reliable instrument for the measurement of the concentration of stickies.” Mahendra Doshi – Editor of Progress in Paper Recycling
Need for On-Line Stickies Monitoring: “Develop reliable tests to measure stickies and to predict deposition on the paper machine. None are available at the moment.” Survey of Deposits and Contaminants in Mills Using Recycled Fibre - Maurice Douek, Bruce Sitholé and Sujit Banerjee
Need for On-Line Stickies Monitoring: “Develop reliable tests to measure stickies and to predict deposition on the paper machine. None are available at the moment.” Survey of Deposits and Contaminants in Mills Using Recycled Fibre - Maurice Douek, Bruce Sitholé and Sujit Banerjee
Meeting An Industry Need • The recycle industry has a need to relate some type of stickies measurement to runnability issues at the paper machine. • IPST at Georgia Tech has developed a method using the measurement of TOC of fractionated samples to measure colloidal organics • Work with this technology has been on going since 2001 & an on-line detector developed • Taking a 12 hour time on 7 different days under stable conditions the on-line sensor gives a COV% of 3 - 10% for colloidal organics and 1.6 - 6.2% for individual TOC values • The purpose of this presentation is to evaluate the initial alpha colloidal organic detector unit at a newsprint paper machine headbox
Fractionation Measurement 150 μ m Micro-stickies Tend to behave like macro-stickies 75 μ m Behavior is Different 25 μ m or Difference Difference 200 nm Colloidal No fiber or fines Micro-stickies 2.5 x More in TOC Colloidal Pitch 70 to 90% < 200 nm TMP than DI P Colloidal Ultra filtration Ultra filtration Organics 4 nm/ 4000 MW EMMA Potential – – EMMA Potential E ffective E ffective TOC M easurement of M easurement of 2 x More in TMP M icro icro- -organic organic M A ccumulation ccumulation A than DI P
Scanner Forming Calendering Gauges – 13% Fabrics – 71% Rolls – 13% Runnability Defining Pressing Section – 64% Drying Section – 71% Survey of Deposits and Contaminants in Mills Using Recycled Survey of Deposits and Contaminants in Mills Using Recycled Fibre Fibre TAPPI Outreach 1.5 to 2 times Maurice Douek, Bruce Sitholé Maurice Douek, Bruce Sithol é – – Paprican & Paprican & Sujit Banerjee Sujit Banerjee – – IPST IPST Program TAPPI 2003 Fall Technical Conference TAPPI 2003 Fall Technical Conference 1-800-291-3145 more issues with Dryers % Based on Days % Based with High on Days % Based on % Based on Number of with High Downtime Industry PM Runnability Issue Breaks Downtime Minutes Survey [1] Wet End/Press Breaks 46 36 37 58 Dryer Breaks 43 45 60 31 Calender Breaks 11 19 2 6 Scanner Build-up 6
Tracking A Week of Colloidal Organics EMMA - Effective Measurement of Micro-organic Accumulation Assume 100 that colloidal Headbox +1 σ particles have a EMMA Potential (ppm-TOC) 90 Average stable nature -1 σ and a normal 80 population +1 σ distribution such 70 that standard deviation can be used to estimate Average 60 a region or zone of colloidal 50 -1 σ stability. 40 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 Sample Date Looking at 7 days gives the best relationship between colloidal organics & runnability issues
Defining Stable Colloidal Organics EMMA - Effective Measurement of Micro-organic Accumulation 100 Headbox +1 σ EMMA Potential (ppm-TOC) High Colloidal 90 Average Unstable -1 σ Concentration = Runnability Issues 80 +1 σ 70 Stable Average 60 Low Colloidal 50 -1 σ Concentration = Unstable Runnability Issues 40 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 Sample Date
Unstable Colloidal Organic Events EMMA - Effective Measurement of Micro-organic Accumulation 100 Based on the Assumption Headbox 3 +1 σ EMMA Potential (ppm-TOC) of Colloidal Stability -- 90 2 Average 5 -1 σ there is a higher 4 80 1 probability of runnability 6 7 issues or events occurring 70 when outside the region of Stable colloidal stability 60 For this week 14 events occurred 50 1 3 4 5 6 7 2 40 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 Sample Date
Swings Driven by Furnish Mix Changes EMMA - Effective Measurement of Micro-organic Accumulation Sun 27 Tue 29 Thu 31 Sat 02 Mon 04 100 90 Headbox +1 σ More DIP Average EMMA Potential (ppm-TOC) 85 -1 σ 90 More DIP Recycle Content (%) 80 Recycle 80 Content 75 70 Swings in the amount 70 of DIP was a 60 significant driver in 65 the amount of 50 colloidal organics 60 present at the More TMP More TMP 40 55 headbox 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 Sample Date
Relating Dry End Break Events to EMMA Potential EMMA - Effective Measurement of Micro-organic Accumulation Sun 27 Tue 29 Thu 31 Sat 02 Mon 04 100 90 120 Headbox 3 +1 σ EMMA Potential (ppm-TOC) Average 85 100 2 90 5 -1 σ Recycle Content (%) Downtime (minutes) 80 80 4 Recycle 80 1 Content 6 7 75 60 70 Dryer Breaks 70 40 60 65 20 50 60 0 1 3 4 5 6 7 2 40 55 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 Sample Date
Relating Dry End Break Events to 4 nm Dissolved Organics Organics Below 4,000 MW Sun 27 Tue 29 Thu 31 Sat 02 Mon 04 160 90 120 Headbox Dissolved Organics (ppm-TOC) +1 σ 150 85 Average 100 -1 σ Recycle Content (%) Downtime (minutes) 140 80 80 Recycle Content 130 75 60 120 Dryer Breaks 70 40 110 65 20 100 60 0 90 80 55 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 Sample Date
Relating All the Events EMMA - Effective Measurement of Micro-organic Accumulation Sun 27 Tue 29 Thu 31 Sat 02 Mon 04 100 90 Headbox +1 σ 3 Holes 5 Holes Average EMMA Potential (ppm-TOC) 2 Holes DE 85 -1 σ 90 HOF Recycle Content (%) 4 WE 80 Recycle 7 HOF 80 1 HOF Content 6 Holes 75 70 WE: Wet End Break DE DE: Dry End Break 70 Holes: Large Holes 60 HOF: Culled Rolls 65 4 Holes 50 DE? 7 DE 60 HOF 3 WE 1 Holes 6 WE 5 WE 2 Holes Holes 40 55 DE DE 08/27 08/28 08/29 08/30 08/31 09/01 09/02 09/03 09/04 HOF Sample Date 14 of the 14 Unstable Conditions had Runnability Issues with 1 or 2 events not expected for a 93 to 88% Relationship of EMMA Potential to Runnability
Results of Attempting to Relate Runnability to TOC Method Runnability Relationship Percentage of Success Unstable Dissolved Organics 88% Unstable EMMA Potential 85% Number of Events 92% Amount of Downtime 82% Average 86% Beta unit Uptime of 69% over 28 weeks (trying to break), Operational Uptime 80%, Commercial Unit at 88% based on a 24 hr/day
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