Optimization of the Hot-Pressing Regime in the Production of Eco-Friendly Fibreboards Bonded with Hydrolysis Lignin

Authors

  • Ivo Valchev
    Affiliation

    Department of Pulp, Paper and Printing Arts, Faculty of Chemical Technologies, University of Chemical Technology and Metallurgy, 1757 Sofia, 8 Kliment Ohridski blvd., Bulgaria

  • Yvailo Yordanov
    Affiliation

    Department of Pulp, Paper and Printing Arts, Faculty of Chemical Technologies, University of Chemical Technology and Metallurgy, 1757 Sofia, 8 Kliment Ohridski blvd., Bulgaria

  • Viktor Savov
    Affiliation

    Department of Mechanical Wood Technology, Faculty of Forest Industry, University of Forestry, 1797 Sofia, 10 Kliment Ohridski blvd., Bulgaria

  • Petar Antov
    Affiliation

    Department of Mechanical Wood Technology, Faculty of Forest Industry, University of Forestry, 1797 Sofia, 10 Kliment Ohridski blvd., Bulgaria

https://doi.org/10.3311/PPch.18284

Abstract

This research was aimed at studying the potential of using residual lignin from acid hydrolysis as a binder in manufacturing eco-friendly, dry-process fibreboards. For that purpose, a modification of the adhesive system and hot-pressing regime was conducted. The adhesive system applied was composed of 2 % phenol-formaldehyde (PF) resin and 10 % hydrolysis lignin (based on the dry fibres). The PF resin does not only act as a binder but generally contributes to the even distribution and good retention of the main binder – hydrolysis lignin. A specific hot-pressing cycle was used. In the first stage, the pressure was 1.0 MPa, followed by an increased pressure of 4.0 MPa, and subsequent cooling. The purpose of the initial lower pressure was softening the lignin and reduction of the material moisture content. The effect of the second stage of hot-pressing on the properties of eco-friendly fibreboards was investigated. It was determined that the fibreboards produced with 2 % PF resin and 10 % hydrolysis lignin have similar physical and mechanical properties to those of the control panels, produced with 10 % PF resin at a standard hot-pressing cycle. The findings of this work demonstrate that residual hydrolysis lignin can be effectively utilized as a binder in the production of eco-friendly, dry-process fibreboards with acceptable physical and mechanical properties.

Keywords:

wood-based panels, eco-friendly, dry-process fibreboards, hydrolysis lignin, hot-pressing

Published Online

2021-11-26

How to Cite

Valchev, I., Yordanov, Y., Savov, V., Antov, P. “Optimization of the Hot-Pressing Regime in the Production of Eco-Friendly Fibreboards Bonded with Hydrolysis Lignin”, Periodica Polytechnica Chemical Engineering, 66(1), pp. 125–134, 2022. https://doi.org/10.3311/PPch.18284

Issue

Section

Articles