Startseite Industrial Thermowood® and Termovuoto thermal modification of two hardwoods from Mozambique
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Industrial Thermowood® and Termovuoto thermal modification of two hardwoods from Mozambique

  • Michael Pockrandt , Mohamed Jebrane , Ignazia Cuccui , Ottaviano Allegretti , Ernesto Uetimane und Nasko Terziev EMAIL logo
Veröffentlicht/Copyright: 30. Juni 2018
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Holzforschung
Aus der Zeitschrift Holzforschung Band 72 Heft 8

Abstract

The study aimed at treating metil (Sterculia appendiculata K. Schum) and neem (Azadirachta indica A. Juss) timber from Mozambique under industrial conditions by steam [Thermowood® (TW)] and vacuum [Termovuoto (TV)] thermal modifications (TM). Matched boards were treated identically and wood alterations in chemistry, colour, mass loss (ML), mechanical properties and durability were compared. The applied vacuum partly removed the acetic acid that causes carbohydrate degradation, i.e. heat applied under vacuum was less destructive. TM under vacuum generated a lighter colour than that caused by steam treatment. ML was significantly higher after the TW process namely, 14.1 vs. 9.9% after thermo-vacuum treatment for metil and 14.2 and 12.1% for neem. Colour and ML changes correlated with the decrease in shear strength, rupture and elasticity moduli and increase in wood decay resistance. Metil wood is more permeable and demonstrated significant differences between the treatments; the thermo-vacuum process was less destructive but led to less improvement of durability compared to TW treatment.

Keywords: Azadirachta indica A. Juss; chemical changes; mass loss; mechanical properties; physical properties; Sterculia appendiculata K. Schum; thermal wood modification

Acknowledgements

The authors gratefully acknowledge the financial support provided by the Swedish Research Council (Vetenskapsrådet) and the Eco-Innovation initiative-EU project TV4NEWOOD ECO/12/333079, Grant Number: ECO/12/333079. Special thanks to Gustav Åström and Erik Åström for the Thermowood® thermal modification at HeatWood AB, Forsa.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

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Received: 2017-09-25
Accepted: 2018-03-08
Published Online: 2018-06-30
Published in Print: 2018-07-26

©2018 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Selected paper from the 19th ISWFPC - International Symposium on Wood, Fibre and Pulping Chemistry, held in Porto Seguro, Brazil, August 30–September 1
  3. Modeling kraft cooking kinetics of fiber mixes from TMP and unbleached kraft pulps for assessment of old corrugated cardboard delignification
  4. Effect of autohydrolysis on alkaline delignification of mixed hardwood chips and on lignin structure
  5. Lignin-based coatings for controlled P-release fertilizer consisting of granulated simple superphosphate
  6. A matrix-resistant HPTLC method to quantify monosaccharides in wood-based lignocellulose biorefinery streams
  7. Review
  8. Utilization and characterization of amino resins for the production of wood-based panels with emphasis on particleboards (PB) and medium density fibreboards (MDF). A review
  9. Original Articles
  10. Influence of veneer thickness, mat formation and resin content on some properties of novel poplar scrimbers
  11. Low-velocity impact response of wood-strand sandwich panels and their components
  12. Interactions between PLA, PE and wood flour: effects of compatibilizing agents and ionic liquids
  13. Industrial Thermowood® and Termovuoto thermal modification of two hardwoods from Mozambique
  14. Boron fixation effect of quaternary ammonium compounds (QACs) on sodium fluoroborate (NaBF4)-treated wood
https://doi.org/10.1515/hf-2017-0153
Schlagwörter für diesen Artikel
Azadirachta indica A. Juss; chemical changes; mass loss; mechanical properties; physical properties; Sterculia appendiculata K. Schum; thermal wood modification

Artikel in diesem Heft

  1. Frontmatter
  2. Selected paper from the 19th ISWFPC - International Symposium on Wood, Fibre and Pulping Chemistry, held in Porto Seguro, Brazil, August 30–September 1
  3. Modeling kraft cooking kinetics of fiber mixes from TMP and unbleached kraft pulps for assessment of old corrugated cardboard delignification
  4. Effect of autohydrolysis on alkaline delignification of mixed hardwood chips and on lignin structure
  5. Lignin-based coatings for controlled P-release fertilizer consisting of granulated simple superphosphate
  6. A matrix-resistant HPTLC method to quantify monosaccharides in wood-based lignocellulose biorefinery streams
  7. Review
  8. Utilization and characterization of amino resins for the production of wood-based panels with emphasis on particleboards (PB) and medium density fibreboards (MDF). A review
  9. Original Articles
  10. Influence of veneer thickness, mat formation and resin content on some properties of novel poplar scrimbers
  11. Low-velocity impact response of wood-strand sandwich panels and their components
  12. Interactions between PLA, PE and wood flour: effects of compatibilizing agents and ionic liquids
  13. Industrial Thermowood® and Termovuoto thermal modification of two hardwoods from Mozambique
  14. Boron fixation effect of quaternary ammonium compounds (QACs) on sodium fluoroborate (NaBF4)-treated wood
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