The influence of mannanase and endoglucanase treatment on the fibre stability of spruce CTMP
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Abstract
An increase in moisture during printing can lead to movement of fibres, such as puffing (return of a fibre to its uncollapsed state), twisting, and lifting of fibres out of the paper web. Spruce fibres are especially subject to these movements, contributing to weak bonding and increased surface roughness. The aim of the present study was to treat spruce pulp with enzymes to improve fibre bonding and stability. Spruce chemi-thermo-mechanical pulp was prepared in the laboratory and treated with mannanase, endoglucanase, and with a combination of these enzymes. Strength properties were evaluated before and after wetting of handsheets and their transverse sections were examined by scanning electron microscopy. Handsheet properties before and after rewetting as well as measurement of lumen area of fibres proved to be effective in evaluating fibre movement and puffing. The treatment of pulp with mannanase or endoglucanase improved fibre stability; however, endoglucanase treatment resulted in a loss of strength. Mannanase appeared to modify the cell walls, making them more susceptible to beating and resulting in improved fibre development and inter-fibre bonding. Endoglucanase possibly damaged fibrils, and fibre degradation instead of fibre development occurred during beating. Stability of thin-walled fibres improved more than thick-walled fibres after enzyme treatment.
©2009 by Walter de Gruyter Berlin New York
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- Meetings
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Articles in the same Issue
- Original Papers
- Orientation of the wood polymers in the cell wall of spruce wood fibres
- MEA/water/AQ-pulping of wheat straw
- Catalytic hydrogenolysis of ethanol organosolv lignin
- The influence of mannanase and endoglucanase treatment on the fibre stability of spruce CTMP
- TEMPO-mediated oxidation of softwood thermomechanical pulp
- Ozone pretreatment of lignocellulosic materials for ethanol production: Improvement of enzymatic susceptibility of softwood
- A preliminary study of green production of fiberboard bonded with tannin and laccase in a wet process
- Extractives in bark of different conifer species growing in Pakistan
- Chelating and antioxidant activity of lignans from Chilean woods (Cupressaceae)
- Effect of surface modification of beech wood flour on mechanical and thermal properties of poly (3-hydroxybutyrate)/wood flour composites
- Microwave radar for detection of resin defects in Pinus elliottii Engelm var elliottii
- Reconstruction of 3D images of internal log characteristics by means of successive 2D log computed tomography images
- Synchrotron X-ray microtomography and 3D image analysis of medium density fiberboard (MDF)
- Non-destructive determination and quantification of diffusion processes in wood by means of neutron imaging
- Application of the end loaded split and single-leg bending tests to the mixed-mode fracture characterization of wood
- Poisson's ratio of plywood measured by tension test
- Characterizing hydro-thermal compression behavior of aspen wood strands
- Decay resistance of acetylated and hexanoylated hardwood and softwood species exposed to Coniophora puteana
- Chemical improvement of surfaces. Part 1: Novel functional modification of wood with covalently bound organoboron compounds
- Primary and secondary decay fungi on exposed pine tree logs in the forest
- Resistance of thermo-hygro-mechanically (THM) densified wood to degradation by white rot fungi
- Meetings
- Meetings
