Dimensional Stability of Modified Wood Composite Panels

2021 ◽  
Vol 53 (4) ◽  
pp. 247-259
Author(s):  
Luis Molina Irribarra ◽  
Frederick A. Kamke ◽  
Scott Leavengood
Keyword(s):  
Dimensional Stability ◽  
Composite Panels ◽  
Wood Composite ◽  
Modified Wood

Hygroscopic properties of thermally modified false Iroko [Antiaris toxicara (Lesch)]

2021 ◽  
Vol 18 (1) ◽  
pp. 51-57
Author(s):  
F.A. Faruwa ◽  
K. Duru
Keyword(s):  
Weight Loss ◽  
Dimensional Stability ◽  
Thermal Process ◽  
Colour Change ◽  
Wood Properties ◽  
Thermal Modification ◽  
Hygroscopic Properties ◽  
Different Temperatures ◽  
Thermally Modified Wood ◽  
Modified Wood

The study investigated the use of thermal modification to improve the hygroscopic properties of False Iroko [Antiaris toxicaria (Lesch)]. Samples of Antiaris toxicara Lesch wood were subjected to thermal modification in a furnace at temperatures of 160, 180 and 200°C for 30 and 60 minutes. Results showed that wood properties were improved with exposure to different temperatures. Subsequent to the thermal process, a colour change from pale yellow to darkish brown was observed progressively with increase in temperature, accompanied by a weight loss in the range of 12.08% to 23.67%. The outcome of these treatments resulted in a decrease in volumetric swelling and increase in dimensional stability of modified wood; this can be attributed to observed decrease in moisture intake. The thermal modification of Antiaris toxicara Lesch wood affected the dimensional stability properties. Thus, due to significant changes via modification carried out on the selected species which is classified as lesser utilized wood species, lesser utilized wood,Antiaristoxicara Lesch wood is recommended for use due to its efficient dimensional stability after modification . keywords:, Thermally modified wood ;False Iroko

scholarly journals Experimental and Theoretical Modal Analysis of Full-Sized Wood Composite Panels Supported on Four Nodes

Materials ◽  
2017 ◽  
Vol 10 (6) ◽  
pp. 683 ◽  
Author(s):  
Cheng Guan ◽  
Houjiang Zhang ◽  
Xiping Wang ◽  
Hu Miao ◽  
Lujing Zhou ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Composite Panels ◽  
Wood Composite

Thermal modification of Southern pine combined with wax emulsion preimpregnation: effect on hydrophobicity and dimensional stability

Holzforschung ◽  
2015 ◽  
Vol 69 (4) ◽  
pp. 405-413 ◽  
Author(s):  
Wang Wang ◽  
Yuan Zhu ◽  
Jinzhen Cao ◽  
Xi Guo
Keyword(s):  
Water Absorption ◽  
Dimensional Stability ◽  
Photoelectron Spectroscopy ◽  
Water Repellency ◽  
Solid Content ◽  
Thermal Modification ◽  
Paraffin Wax ◽  
Southern Pine ◽  
Thermally Modified Wood ◽  
Modified Wood

Abstract The aim of this study was to enhance the water repellency and dimensional stability of thermally modified wood by combining the preimpregnation of paraffin wax emulsion. To achieve this, Southern pine (SP; Pinus spp.) samples were first impregnated with paraffin wax emulsion (with 2.0% solid content) and then subjected to thermal modification (TM) in an oven at 180°C and 220°C for 4 and 8 h. The contact angle (CA), surface free energy, water absorption rate (WAR), anti-swelling efficiency (ASE), and bending properties of the control and modified samples were investigated. Moreover, the chemical and morphological alterations were analyzed by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Both the wax impregnation and TM decreased the surface wettability, water absorption, and tangential swelling, while the combination of wax and thermal treatment exhibited the best water repellency and dimensional stability, indicating the synergism between the two procedures. However, the wax preimpregnation did not affect the mechanical properties of thermally modified wood. The FTIR, SEM, and XPS analyses confirmed that the synergistic effect is mainly due to the redistribution of the paraffin wax during TM rather than its impact on the chemical changes caused by thermal degradation.

scholarly journals RESEARCH OF THE SWELLING KINETICS OF PINE WOOD, MODIFIED WITH AMINO-BORATES

2018 ◽  
Vol 3 (3) ◽  
pp. 81-88
Author(s):  
Ирина Котлярова ◽  
Irina Kotlyarova ◽  
Ирина Степина ◽  
Irina Stepina
Keyword(s):  
Control Sample ◽  
Swelling Kinetics ◽  
Wood Composite ◽  
Wood Material ◽  
Pine Wood ◽  
Weight Method ◽  
Kinetics Of ◽  
Water Sorption Capacity ◽  
Unmodified Wood ◽  
Modified Wood

Wood swells at the contact with capillary and liquid water. This process leads to premature destruction of wood material due to the decrease in its strength characteristics. It is possible to reduce wood swelling in various ways: deep impregnation by hydrophobic reagents, covering the surface with paints and varnishes etc. However, in this case the texture of wood is masked and its unique properties are lost. When modifying wood with amino-borates the supramolecular structure of cellulose is ordered, the specific surface of wood decreases, and its water sorption capacity is reduced. In this regard, we have researched the influence of boron-nitrogenous modifiers of various concentrations on pine wood swelling. The swelling ability of the modified wood was estimated by weight method. As a control sample the samples of unmodified wood were used. On the basis of the obtained experimental data the differential curves of swelling were built and the velocity constants of swelling were determined by a graphic method. As a result of the research it has been established that modifying wood with amino-borates leads to the decrease of equilibrium extent of swelling, and the velocity constant of swelling depends on the nature and concentration of the modifier and its influence on the microstructure of a wood composite.

scholarly journals DEVELOPMENT OF A COMPOSITIONAL MODIFIER FOR MODIFICATION OF WOOD BY SPECIFIED PROPERTIES

2020 ◽  
Vol 8 (1) ◽  
pp. 17-22
Author(s):  
Aleksey Aksenov ◽  
Sergey Malyukov ◽  
A. Solntsev
Keyword(s):  
Water Absorption ◽  
Dimensional Stability ◽  
Filter Paper ◽  
Atmospheric Pressure ◽  
Moisture Absorption ◽  
Friction Units ◽  
Environmental Requirements ◽  
Impregnated Wood ◽  
Modified Wood

In recent years, the production of modified wood has been actively developing abroad. This article discusses the composition of a complex modifier for modified wood, which will improve the performance of friction units with bearings made of modified wood by reducing intermolecular interactions between contacting bodies, increase dimensional stability and hardness of modified wood, and will also comply with environmental requirements. The density of the liquid components of the impregnating compositions was determined. The number of components necessary for the preparation of impregnating compositions was calculated. The impregnation technology is as follows: the impregnating composition is poured into a tin can, heated on an electric stove to 120 0C. Prepared (dried, weighed, measured on three sides and marked) samples of 15 pieces in each impregnating composition are immersed in a hot impregnating solution. Tin cans with samples are placed in a pre-heated autoclave, closed, and brought to a pressure of 40 atm. At this pressure, the samples are kept for 5 minutes. Then the pressure is brought to atmospheric pressure, the samples are removed, dried with filter paper and placed in a desiccator for cooling to a temperature of 20 ± 2 0С. After cooling, the samples are weighed on an analytical balance to the nearest 0.002 g and the three sides of the sample are measured with a caliper. The quality of impregnation of the samples was determined. Water absorption, moisture absorption, linear swelling of the samples of impregnated wood were determined.

Sign in / Sign up

Export Citation Format

Share Document