The effect of fibre properties, fines content and surfactant addition on dewatering, wet and dry web properties
-
Hanna Lindqvist
,
Kristian Salminen
Abstract
Speed of paper machines is often limited by the drainage rate of the furnish and the mechanical properties of the wet web, i.e. the tension and relaxation properties. In this study, the effects of alteration of fibre properties and fines content by gentle and harsh refining on dewatering as well as on wet and dry web properties were determined. Both types of refining or addition of fines prolonged the dewatering time but also improved the mechanical properties. Harsh refining with much fibre cutting resulted in longer dewatering time, lower dry content after wet pressing and higher density of dry sheets than gentle refining with much external/internal fibrillation of fibres. Removal of fines shortened the dewatering time but decreased the wet web and dry tensile strength, and the residual tension compared to pulps containing fines. The fibre properties contributed more to the residual tension, while the fines content was more important for the wet web tensile strength. Addition of a non-ionic surfactant shortened the dewatering time of refined pulp without deteriorating the mechanical properties. By tailoring the refining and addition of surfactants, the mechanical properties of the wet web could be improved without prolonging the dewatering time.
© 2018 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Extraction and chemical characterization of Norway spruce inner and outer bark
- Hot-water extraction and characterization of spruce bark non-cellulosic polysaccharides
- Properties of cellulose pulps and their influence on the production of a cellulose ether
- Improved quality of SC magazine paper through enhanced fibre development using the ATMP process
- Alternative alkalis for peroxide bleaching of chemithermomechanical pulp
- Brightness development of a hydrogen peroxide bleached spruce TMP. Comparisons of pre-treatments with DTPA and a separable chelating surfactant
- Pressurised compressive chip pre-treatment of Norway spruce with a mill scale Impressafiner
- Relating ink solvent-coating component thermal properties to smearing and development of abrasion resistance in ink jet printing
- Effect of coating formulations and drying methods on the coverage and smoothness of brown grade base papers
- Improvement of the retention-formation relationship using three-component retention aid systems
- The development of hydrophobised ground calcium carbonate particles for the effective adsorption of dissolved and colloidal substances (DCS) from thermo mechanical pulp (TMP) filtrates
- The effect of fibre properties, fines content and surfactant addition on dewatering, wet and dry web properties
- Online detection of moisture in heatset printing: Liquid transfer to printed image and non-image areas
- An investigation of friction mechanisms of paper-to-paper friction of coated papers
- The effects of TMP and filler stratifying on wet web runnability and end product quality of fine paper
- Modelling of fibre orientation probability distribution in the jet-to-wire impingement
- Evaluation of furnishes for tissue manufacturing; suction box dewatering and paper testing
- Evaluation of a Novel Hydrocyclone Design for Pulp Fractionation
