Materials & Design
Abstract
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http://www.sciencedirect.com/science/article/pii/S0261306913010212
April 2014, Vol.56:91–96, doi:10.1016/j.matdes.2013.10.078
Received 31 August 2013. Accepted 27 October 2013. Available online 7 November 2013.
Highlights
- •Hardner type, urea usage, and conditioning period of particleboard were investigated.
- •Best properties were obtained from panels manufactured with ammonium chloride.
- •The urea usage positively affected the formaldehyde emission.
- •Increasing conditioning period of panels resulted in better quality properties
The effects of hardener type (ammonium chloride, ammonium sulphate and aluminium sulphate), urea usage (with urea and without urea), and conditioning period (one day and one month) of the particleboard on the physical (thickness swelling), mechanical (modulus of rupture, modulus of elasticity and internal bond strength), surface properties, and formaldehyde emission of particleboard and acidity of the wood particles were investigated. The hardener type was found to be effective all of the properties of particleboard. The pH of the wood particle with the urea was slightly higher than that of particles without urea.
The lowest pH value for the resinated wood particles was obtained from ammonium chloride, followed by ammonium sulphate and aluminium sulphate, respectively. The best quality properties were obtained from the particleboards manufactured with ammonium chloride, followed by particleboard made with the ammonium sulphate and aluminium sulphate, respectively. The urea usage significantly decreased the formaldehyde emission of the particleboards while it slightly decreased the mechanical properties and increased thickness swelling. Increasing conditioning period of the particleboards from one day to one month improved the quality properties.
Keywords- Particleboard
- Hardener type
- Urea usage
- Conditioning period
- Formaldehyde emission
- Surface roughness
- ⁎ Corresponding author. Address: Department of Wood Mechanics and Technology, Forestry Faculty, Istanbul University Bahcekoy, 34473 Istanbul, Turkey. Tel.: +90 (212) 226 1100x25083; fax: +90 (212) 226 1113.
Copyright © 2013 Elsevier Ltd. All rights reserved.
For further details log on website :
http://www.sciencedirect.com/science/article/pii/S0261306913010212
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