Preparation and Properties of Heat-treated Masson Pine (Pinus massoniana) Veneer

Abstract

The feasibility of heat treatment of Masson pine veneers (MPVs) was evaluated based on mass loss, tensile strength, bending strength, and water absorption of the heat-treated MPVs, and its application in plywood was explored. Fourier-transform infrared and X-ray diffraction results showed that heat-treated MPVs contained a lower amount of hydrophilic groups and had an increased crystallinity. The maximum tensile strength was 59.2 MPa when MPVs were heat-treated at 210 °C for 5.0 min. The corresponding mass loss, water absorption (384 h), and bending strength values were 1.72%, 105.44%, and 83.1 MPa, respectively. Plywood produced from heat-treated MPV (210 °C, 30 min) with the best fungal durability and the lowest shear strength (1.07 MPa) still met the requirements of the Chinese National Standard (GB/T 9846.3-2004, ≥0.80 MPa) for exterior plywood. These results indicate that products based on heat-treated MPV will have increased fungal durability.

Properties of a Laminated Wood Composite Produced with Thermomechanically Treated Veneers

“…This evinced the notion that the employment of thermomechanical treatment of veneers enhanced static bending since the material turned out to be more resistant to elastic deformation without lowering the rupture load. Similar results were found by Chen et al [23]. The authors observed that bending strength of plywood manufactured using heat-treated veneers was higher than that obtained in untreated material.…”

Experiments and modeling of the torrefaction of white wood fuel pellets

“…Below 200 °C, the temperature influence was modest, with an almost imperceptible increase of 0.06% from 160 to 180 °C and a 0.9% increase from 180 to 200 °C. Therefore, it is recommended to use temperatures over 200 °C during torrefaction treatment, as other authors stated before (Esteves and Pereira 2009;Chen et al 2015b).…”

“…From the analysis of the volatile compounds, ash, and active carbon contents (Table 2), it was observed that the active carbon content easily increased during torrefaction from 76% to 80% for the spruce pellets, which was an increase of approximately 5.2%. This enrichment in carbon is important (Chen et al 2015b) because of the various uses for activated carbon (fining off/filter for liquid food or enrichment in carbon in iron and steel industry). The black ash content obtained after the volatile compounds content and the light-gray ash content obtained after calcinations were calculated.…”

“…The calorific value is 27.1 MJ/kg for lignin, 16.2 MJ/kg for cellulose, and 16.1 MJ/kg for hemicellulose. The calorific value of lignin is close to that of charcoal, and the small difference between the values was because of the activation of chemical compounds during wood pyrolysis (Chen et al 2015b). The calorific value of the torrefied pellets was considered to be a weighted average of the calorific values for holocellulose and lignin.…”

Calorific Characteristics of Larch (Larix decidua) and Oak (Quercus robur) Pellets Realized from Native and Torrefied Sawdust

“…In other words, it would be accurate to say that the same amount of CO 2 is obtained when wooden waste/biomass is decomposed in an open space over a few years. Therefore, the use of woody waste/biomass as energy for human needs is recommended [4,5]. Natural gases have obtained a privileged position as fuels because they burn more cleanly than oil or coal, namely because that the process produces a low amount of pollution in the air.…”