Alkaline Chemi-Mechanical Pulp from Poplar. Relationship between Chemical State, Swelling and Papermaking Properties
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M. Zanuttini
Summary
In order to analyse the fundamentals of alkaline chemi-mechanical pulping of hardwoods, the chemical state of the wood was related to both the swelling level of fibres and the papermaking properties of pulp. Wafers of poplar wood were alkali treated following a factorial experimental design for two variables: temperature and alkali concentration. Treated wafers were hot defibrated in a 300-mm disk mill at 15% consistency, and then refined in PFI mill at 20% consistency. Results show how fibre swelling gradually increases as alkaline action is increased. The significant improvement in tensile and tear strength of the pulp can, in great part, be ascribed to the development of fibre bonding capacity. A limited effect of ion content on cell wall swelling was found. Swelling correlates well with deacetylation level, and is a major factor in determining the tensile strength and scattering ability of the pulp.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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- Natural Decay Resistance of Juvenile Teak Wood Grown in High Input Plantations
- The Need for Unequivocally Defined Reference Fungi-Genomic Variation in Two Strains Named as Coniophora puteana BAM Ebw. 15
- The Oriented Structure of Lignin and its Viscoelastic Properties Studied by Static and Dynamic FT-IR Spectroscopy
- Formation of β-O-4 Lignin Models -A Theoretical Study
- Synthesis of Lignin-Related Cinnamaldehydes
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- Alkaline Chemi-Mechanical Pulp from Poplar. Relationship between Chemical State, Swelling and Papermaking Properties
- Effect of Ozonation on Assembly of Xylans
- Oxidized Derivatives of Lipophilic Extractives Formed during Hardwood Kraft Pulp Bleaching
- Optimization of a Laccase-Mediator Stage for TCF Bleaching of Flax Pulp
- Analysis of Pinus radiata D. Don Bark by Near Infrared Spectroscopy
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- The Adjusted Dynamic Modulus of Elasticity Above the Fiber Saturation Point in Taiwania Plantation Wood by Ultrasonic-Wave Measurement
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