Contact person
Christina Wedin
Coordinator
Contact Christina
Characterisation of cellulose pulp
In order to develop and optimise the pulp process, it is important to test and characterise the pulp. This is partly to find out which properties are affected when the process conditions change.
Purpose
Refining pulp for sheets and testing provides a good overview of the important properties of the end product for good quality. Evaluation of the fibre composition or the effect of meld chemistry is also possible. See RISE opportunities below. It is also possible to order mapping in use to monitor important parameters.
Method
Refinery
- Conical refiner
- PFI-mill
Pulp properties
- Beating Degree SR°/Freeness CSF
- Dewatering ability, DDA
- Water retention value, WRV
Preparation of the pulp
- Pulp concentration
- Standard water/deionised water / distilled water/MilliQ water
- Dry content determination
- Disintegration
Laboratory sheet former
- Conventional sheet former
- Rapid Köthen sheet former
Properties of hand sheets
- Grammage
- Thickness, bulk and density
- Tensile strength properties
- Brightness
- Air permanence/porosity, Bendtsen
- Air resistance, Gurley
- Burst strength
- Tearing resistance
Optical properties
- ISO-Brightness
- Whiteness CIE
- Light scattering coefficient, s
- Light absorption coefficient, k
Fibre contribution
Bauer McNett, fibre fractions
Britt Jar, fines
Somerville, shives - screening of pulp stickies, plastics, sand, metal pieces, and flakes in recycled fibre.
Fibre dimensions
- Fibre length
- Fibre width
- Fibre form, curl
- Fine material
- Fibre weight, coarseness
- Shieves
- Fibre length distribution
- Kinks
- Pictures, fibres
Impurities
- Dirt and tip
- Assessment of dirt and lace in sheet-dried pulp with trans-illumination
- Dirt in pulp
- Stone cells
Permanence
- Accelerating heat ageing 105°C / 100°C
- Accelerating ageing 80°C 65% moisture
- Accelerating heat ageing 120°C or 150°C
- Accelerating ageing when exposed to light
- Brightness Ageing in Health Test Cabinet (Xenon Light)
Meld chemistry
- Ash 525°C / 900°C
- Cation demand
- Retention studies, Britt Jar, DDA
- Turbidity
- Z-potential
Deliveries
RISE delivers a report with data in Excel format, supplemented with relevant images and diagrams. The report is compiled according to standardised analysis methods and includes an assessment of measurement uncertainty as well as comments that deepen the understanding of the results. All relevant parameters for the current analysis are included.
