Abstract
Detection of the onset of fiber cutting is beneficial in low consistency refining as it may prevent reduction of average fiber length, optimize fiber quality improvements by operating at gaps just wider than the critical gap, avoid decreasing the strength properties of paper, and increase energy efficiency. The objective of this study is to understand the effect of pulp furnish on measured bar forces and, more specifically, on the detection of fiber cutting. Bar forces, i. e. forces applied to pulp fibers by the refiner bars, are measured with a custom-designed piezoelectric force sensor. Trials were conducted with an AIKAWA 16-in. single-disc refiner using hemlock/balsam softwood thermomechanical pulp, SPF softwood thermomechanical pulp, northern bleached softwood kraft pulp, and aspen hardwood thermomechanical pulp at 3.0 to 3.5 % consistency at rotational speeds of 1200 and 1400 rpm. The power of the time domain signal of the measured forces is introduced as an indicator of the onset of fiber cutting. Our results show that this new fiber cutting metric is a sensitive and reliable metric for determination of fibre cutting for a range of pulp furnishes. The study suggests that the refiner force sensor has potential to be exploited for in-process detection of fiber cutting.
Funding statement: This work is supported by a Collaborative Research and Development grant, of $4 million over 5 years, provided by Natural Sciences and Engineering Research Council of Canada (NSERC) and the following partners: AB Enzymes, Alberta Newsprint Company, Andritz, BC Hydro, Canfor, Catalyst Paper, FPInnovations, Holmen Paper, Meadow Lake Pulp (Paper Excellence), Millar Western, NORPAC, West Fraser, Westcan Engineering, and Winstone Pulp International.
Acknowledgments
The authors wish to thank M. Miller, E. Jahangir, R. Seifert, and G. Soong for their assistance during the preparation and execution of the refining trials, and for conducting the sample characterisations at the Pulp and Paper Centre at the University of British Columbia.
Conflict of interest: The authors do not have any conflicts of interest to declare.
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© 2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Publisher’s note
- Now at De Gruyter: Nordic Pulp & Paper Research Journal
- Editorial
- News from Nordic Pulp & Paper Research Journal
- Chemical pulping
- Optimum strategies for pulp fractions refining
- Deinking
- Deinkability of different secondary fibers by enzymes
- Mechanical pulping
- Investigation of low consistency reject refining of mechanical pulp for energy savings
- Control strategies for refiners Part I: Soft sensors for CD-refiner control
- Control strategies for refiners Part II: Consistency control in twin-disc refining zones using temperature profile information
- Indications of the onset of fiber cutting in low consistency refining using a refiner force sensor: The effect of pulp furnish
- TMP properties and refining conditions in a CD82 chip refiner. Part I: Step changes of process variables, description of the tests
- TMP properties and refiner conditions in a CD82 chip refiner at different operation points. Part II: Comparison of the five tests
- Paper chemistry
- Parameters influencing hydrophobization of paper by surface sizing
- Effect of pigment sizing on printability and coating structure of decorative base paper
- Strengthening effect of polyelectrolyte multilayers on highly filled paper
- Paper physics
- The effect of the through-thickness moisture content gradient on the moisture accelerated creep of paperboard: Hygro-viscoelastic modeling approach
- Paper technology
- Online quality evaluation of tissue paper structure on new generation tissue machines
- Strong paper from spruce CTMP – Part II: Effect of pressing at nip press temperatures above the lignin softening temperature
- Printing
- Impact of non-uniform water absorption on water-interference print mottle in offset printing
Artikel in diesem Heft
- Frontmatter
- Publisher’s note
- Now at De Gruyter: Nordic Pulp & Paper Research Journal
- Editorial
- News from Nordic Pulp & Paper Research Journal
- Chemical pulping
- Optimum strategies for pulp fractions refining
- Deinking
- Deinkability of different secondary fibers by enzymes
- Mechanical pulping
- Investigation of low consistency reject refining of mechanical pulp for energy savings
- Control strategies for refiners Part I: Soft sensors for CD-refiner control
- Control strategies for refiners Part II: Consistency control in twin-disc refining zones using temperature profile information
- Indications of the onset of fiber cutting in low consistency refining using a refiner force sensor: The effect of pulp furnish
- TMP properties and refining conditions in a CD82 chip refiner. Part I: Step changes of process variables, description of the tests
- TMP properties and refiner conditions in a CD82 chip refiner at different operation points. Part II: Comparison of the five tests
- Paper chemistry
- Parameters influencing hydrophobization of paper by surface sizing
- Effect of pigment sizing on printability and coating structure of decorative base paper
- Strengthening effect of polyelectrolyte multilayers on highly filled paper
- Paper physics
- The effect of the through-thickness moisture content gradient on the moisture accelerated creep of paperboard: Hygro-viscoelastic modeling approach
- Paper technology
- Online quality evaluation of tissue paper structure on new generation tissue machines
- Strong paper from spruce CTMP – Part II: Effect of pressing at nip press temperatures above the lignin softening temperature
- Printing
- Impact of non-uniform water absorption on water-interference print mottle in offset printing