Utilization of partially liquefied bark for production of particleboards
Bark as a sawmilling residue can be used for producing value-added chemicals and materials. This study investigated the use of partially liquefied bark (PLB) for producing particleboard with or without synthetic adhesives. Maritime pine (Pinus pinaster Ait.) bark was partially liquefied in the presence of ethylene glycol and sulfuric acid. Four types of particleboard panels were prepared with a PLB content of 4.7 %, 9.1 %, 20 %, and 33.3 %, respectively. Another five types of particleboard panels were manufactured by using similar amounts of PLB and 10 wt.% of melamine-urea-formaldehyde (MUF) adhesives. Characterization of bark and solid residues of PLB was performed by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and automated vapor sorption (AVS). Mechanical and physical properties of the particleboard were tested according to the European standards EN 310 for determining modulus of elasticity and bending strength, EN 317 for determining thickness swelling after immersion in water, and EN 319 for determining internal bond strength. The results showed that the increase in PLB content improved the mechanical strength for the non-MUF boards, and the MUF-bonded boards with up to 20 % of PLB met the requirements for interior uses in dry conditions according to EN 312. The non-MUF boards containing 33.3 % of PLB and the MUF-bonded boards showed comparable thickness swelling and water absorption levels compared to the reference board.
2020
2022-01-05 12:02:50
1033
bark, bonding, partial liquefaction, MUF adhesives, water vapor sorption, thickness swelling, wood-based panels
skorja, lepljenje, delno utekočinjen les, MUF lepilo, absorpcija vode, debelinski nabrek, leseni ploščni kompoziti
dk_c
Wen
Jiang
70
Stergios
Adamopoulos
70
Reza
Hosseinpourpia
70
Jure
Žigon
70
Marko
Petrič
70
Milan
Šernek
70
Sergej
Medved
70
UDK
4
630*8
ISSN pri članku
9
2076-3417
DOI
15
10.3390/app10155253
COBISS_ID
3
24100355
RAZ_Jiang_Wen_2020.pdf
4471001
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Izvorni URL
2022-01-05 12:02:57