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Welcome
Themes
Introduction to forest-based bioeconomy
Wood products
Natural fibre products
Man-made bio-based fibre products
Bio-based nanomaterials
Recycled fibre
Pulping and biorefining
Energy and biofuels
Biomass chemistry and physiology
Material testing and product properties
Forests and other biomass resources
Supply chain
Process control and automation
Asset management
Business and investment planning
Environmental control and management
Learning paths
Learning path A
Learning path B
Other resources
Papermaking Science and Technology books
Podcasts
Webinars
Tools
How to use
Dictionary
Glossary
Contact
Contact us
Contributors
Profile
Light scattering and light absorption coefficient
After reading this article you will..
understand the relationship between the reflectivity values,
s
,
k
and the opacity values.
understand that the Kubelka-Munk theory can be used for simulation calculations.
Content
Material testing and product properties
Why test pulp and paper?
Selecting proper tests and analyses
Examples of selecting tests
Testing vs. characterisation
Fibre properties
Fibre dimensions
Measurement of fibre properties optically
Single fibre strength properties
Fibre wall porosity and water retention value of pulp
Fibre surface fibrillation and fibre deformations
Papermaking properties of pulp
Sample preparation before testing
Laboratory beating of chemical pulp
Dewatering properties of pulps
Fibre analysis
Preparation of laboratory sheets
Evaluating the papermaking potential of pulps
Furnish optimisation
Fluff pulps
Pulp properties measured from the original pulp sheet in the dry state
Pulp properties measured in wet state
Testing of fluff properties
Other test methods
Liquid acquisition
Chemical analysis of pulps
Fibre surface composition
Dirt and shives in pulp
Colour reversion
Inorganic matter
Properties and components of water extracts
Analysis of dissolving pulps
General physical properties of paper and board
Preparations for testing
Basic properties
Strength properties
Tensile strength and fracture toughness
Bursting strength and tearing strength
Z-directional strength
Folding endurance
Bending stiffness and tensile stiffness
Ultrasonic tensile stiffness method
Structural properties
Surface properties
Absorption properties
Optical properties of paper
Reflectance measurements
Colour measurements
ISO brightness
Opacity
Light scattering and light absorption coefficient
Whiteness
Measuring the reflectance of fluorescent materials
Equipment for measuring optical properties
End-use properties of printing papers
Runnability
Cracking
Runnability in sheet-fed printing
Dimensional stability
Cockling
Testing of time-dependent runnability problems
Printability and print quality
Testing of printability and print quality on a laboratory scale
Full-scale printing trials
End-use properties of packaging papers and boards
Strength and stiffness properties
Compression resistance tests
Tests for corrugated board
Effect of humidity and viscoelastic behaviour of paper and board
Protection and barrier properties
Paper and board as food packaging materials
Tissue papers
Standard tests
Absorbency properties
Tensile strength and stretch
Softness
Other properties of tissue
Permanent papers
Requirements and tests for permanence
Categories of permanent papers
Reliability of results in physical testing of pulp and paper
Procedure for evaluating and expressing the uncertainty of measurement
Main components of uncertainty in pulp and paper testing
Size of uncertainty, repeatability and reproducibility in different measurements
Quality control at the mill
Automatic profile measurements
Online quality measurements
Standardisation in pulp and paper testing
ISO
CEN
TAPPI
Benefit of standards
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Authors & references
Edited by:
Petteri Maijanen, ABB
References:
Pauler, N., Paper Optics, 2nd Edition, AB Lorentzen & Wettre, Kista, 2012, p. 63-64
Pauler, N., Paper Optics, 2nd Edition, AB Lorentzen & Wettre, Kista, 2012, p. 65
Pauler, N., Paper Optics, 2nd Edition, AB Lorentzen & Wettre, Kista, 2012, p. 67
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This page has been updated 31.03.2021