Effect of wood chip size on hemicellulose extraction and technological properties of flakeboard
Effect of wood chip size on hemicellulose extraction and technological properties of flakeboard
The effect of chip size on hemicellulose extraction of wood and technological properties of flakeboard were investigated.Three different sizes of wood chips were treated with hot water in a digester at 170 °C for 90 min. After hydrothermal treatment, thewood chips were washed with water and then dried in a dryer. Flakes were produced from control and treated chips using a flaker.Flakeboards were produced from the flakes using urea-formaldehyde resin. The results showed that chip size had a significant effecton the chemical properties of hydrothermally treated wood under pressure in hot water. As chip size was decreased, the amounts ofextractives and hemicelluloses decreased in the wood, while the amounts of cellulose and lignin increased. As for the physical propertiesof the flakeboards, thickness swelling and water absorption significantly decreased with decreasing chip size. There were significantdifferences in the flexural strength and internal bond strength of the flakeboards produced from untreated and treated chips. Theinternal bond strength of the flakeboards improved with decreasing chip size. Flakeboards produced from the flakes of hydrothermallytreated chips (thickness: 7.4 mm, width: 9.2 mm, and length: 38.5 mm) showed optimum physical and mechanical properties.
___
- Ayrilmis N, Buyuksari U, Avci E, Koc E (2009). Utilization of
pine (Pinus pinea L.) cone in manufacture of wood based
composite. Forest Ecol Manag 259: 65-70.
- Ayrilmis N, Jarusombuti S, Fuengvivat V, Bauchongkol P (2011).
Effect of thermal treatment of rubber wood fibres on
physical and mechanical properties of medium density
fibreboard. J Trop For Sci 23: 10-16.
- Ayrilmis, N, Laufenberg T, Winandy JE (2009). Dimensional
stability and creep behavior of heat-treated exterior
medium density fiberboard. European Journal of Wood
and Wood Products 67: 287-295.
- Browning BL (1967). Methods of Wood Chemistry. Vol. 2. New
York, NY, USA: Interscience/Wiley.
- Burgos F, Rolleri A (2012). Effect of hydro- and hygro-thermal
treatments on some wood properties of Pinus radiata and
Pseudutsuga menziesii. Drvna Indus 63: 211-215.
- Dos Santos DVB, Moura LF, Brito JO (2014). Effect of heat
treatment on color, weight loss, specific gravity and
equilibrium moisture content of two low market valued
tropical woods. Wood Res-Slovakia 59: 253-264.
- Hosseinaei O, Wang S, Rials TG, Xing C, Taylor AM, Kelley
SS (2011). Effect of hemicellulose extraction on physical
and mechanical properties and mold susceptibility of
flakeboard. Forest Prod J 61: 31-37.
- Hosseinaei O, Wang S, Taylor AM, Kim JW (2012). Effect of
hemicellulose extraction on water absorption and mold
susceptibility of wood plastic composites. Int Biodeter
Biodegr 71: 29-35.
- Korean Standard Association (2002). Particleboard Standard. KS
F 3104. Seoul, South Korea: Korean Standard Association.
- Kwon JH, Ayrilmis N (2016). Effect of heat-treatment of flakes
on physical and mechanical properties of flakeboard.
European Journal of Wood and Wood Products 74: 135-
136.
- Li Z, Qin M, Xu C, Chen X (2013). Hot water extraction of
hemicelluloses from aspen wood chips of different sizes.
Bioresources 8: 5690-5700.
- Lu X, Yamauchi K, Phaiboonsilpa N, Saka S (2009). Two-step
hydrolysis of Japanese beech as treated by semi-flow hotcompressed water. J Wood Sci 55: 367-375.
- Nemli G, Aydin A (2007). Evaluation of the physical and
mechanical properties of particleboard made from the
needle litter of Pinus pinaster Ait. Ind Crop Prod 26: 252-
258.
- Nemli G, Colakoglu G (2005). Effects of mimosa bark usage on
some properties of particleboard. Turk J Agric For 29: 227-
230.
- Sundqvist B (2004). Color changes and acid formation in wood
during heating. PhD, Lulea University of Technology,
Skelleftea, Sweden.
- TAPPI (1988). TAPPI T 204 om, Solvent Extractives of Wood
and Pulp. Atlanta, GA, USA: TAPPI Press.
- Wise EL, Karl HL (1962). Cellulose and hemicelluloses in pulp
and paper science and technology. In: Libby CE, editor.
Pulp. Vol. 1. New York, NY, USA: McGraw-Hill Book
Company.
- Wyman CE, Dale BE, Elander RT, Oltzapple M, Ladisch MR, Lee
YY (2005). Coordinated development of leading biomass
pretreatment technologies. Bioresource Technol 96: 1959-
1966.
- Yildiz, S, Gumuskaya E (2007). The effects of thermal modification
on crystalline structure of cellulose in soft and hardwood.
Build Environ 42: 62-67.
- Yoon SH, van Heiningen A (2010). Green liquor extraction of
hemicelluloses from southern pine in an integrated forest
biorefinery. J Ind Eng Chem 16: 74-80.