scholarly journals "An order of deep-fried two-by-fours please!"

2007 ◽  
Vol 83 (4) ◽  
pp. 475-477
Author(s):  
P A Cooper ◽  
J. Wang ◽  
Y T Ung
Keyword(s):  
High Temperature ◽  
Key Words ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Dimensional Stability ◽  
Water Repellency ◽  
Thermal Modification ◽  
Oil Stability ◽  
Termite Resistance

Thermal modification of wood by immersion in high temperature vegetable oils and other additives impart significant decay and mould fungi resistance, water repellency and dimensional stability. Key words: thermal modification, wood, vegetable oil, decay, termite resistance, oil stability

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.

Chemical, physico-mechanical properties and biological durability of rubberwood particleboards after post heat-treatment in palm oil

Holzforschung ◽  
2018 ◽  
Vol 72 (2) ◽  
pp. 159-167 ◽  
Author(s):  
Seng Hua Lee ◽  
Zaidon Ashaari ◽  
Wei Chen Lum ◽  
Aik Fei Ang ◽  
Juliana Abdul Halip ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Palm Oil ◽  
Dimensional Stability ◽  
Urea Formaldehyde ◽  
Chemical Properties ◽  
Water Repellency ◽  
Post Heat Treatment ◽  
Termite Resistance ◽  
Biological Durability

AbstractThe chemical properties, dimensional stability, mechanical strength and termite resistance of urea formaldehyde (UF) bond rubberwood (RW) particleboard (PB) were assessed after a two-step oil heat treatment (OHT). The PB was immersed in palm oil before heating to 180, 200, and 220°C in a laboratory oven for 2 h. Anti-swelling efficiency (ASE) and water repellency efficiency (WRE) as well as bending (MOE, MOR) and internal bonding strength (IB) were determined. Resistance against a subterranean termite,Coptotermes curvignathusHolmgren, was tested. The degradation of hemicelluloses and cellulose, that are mainly responsible for wood wetting processes, was confirmed by Fourier transform infrared (FTIR) spectra. Formation of an elevated cross-linking density in lignin also contributed to the dimensional stability, where 93.6% ASE and 46.3% WRE were achieved in the samples treated at 220°C. Mechanical properties of treated samples were inferior to the control samples due to hemicelluloses degradation and breakage of the UF bonding network. A significant improvement in termite resistance has been found in the treated samples.

LOCATION OF OILSEED PRODUCTION IN TERMS OF VEGETABLE OIL EXPORT

2020 ◽  
Vol 1 (10) ◽  
pp. 94-100
Author(s):  
Yu. V. RAGULINA ◽  
Keyword(s):  
Seed Production ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Sunflower Oil ◽  
World Export ◽  
Oil Export ◽  
Oilseed Production

The article is devoted to the issues of placing seed production in the conditions of world export of vegetable oils. In 2019, the volume of Russian exports of sunflower oil exceeded 3 million tons for a total of $ 2,2 billion, which is about 30% of the vegetable oil produced in the country. In Russia, the main oilseeds are sunflower, rapeseed, and soy. Less common crops include oilseed flax, ginger, mustard, and safflower. It is stated that in 2001–2019, the acreage of all types of oilseeds in the country increased by more than 2 times, and the gross harvest – by 3,3 times, while the yield increased by 1,4 times.

Dimensional Stability of Poplar Wood after Densification Combined with Heat Treatment

2012 ◽  
Vol 152-154 ◽  
pp. 112-116 ◽  
Author(s):  
Jia Bin Cai ◽  
Tao Ding ◽  
Liu Yang
Keyword(s):  
Heat Treatment ◽  
Dimensional Stability ◽  
Hybrid Poplar ◽  
Treatment Temperature ◽  
Thermal Modification ◽  
Holding Time ◽  
Poplar Wood ◽  
Compression Set ◽  
Densification Temperature

Hybrid poplar boards were subjected to thermo-mechanical densification combined with heat treatment. Hydroscopicity and hygroscopicity of the treated samples were measured. The results showed that dimensional stability of the samples was influenced by compression set significantly. The higher the compression set, the greater the swelling of the samples. On the contrary, the influence of densification temperature and duration was not significant. Thermal modification significantly reduced hydroscopicity and hygroscopicity of the samples. Both higher treatment temperature and longer holding time resulted in better dimensional stability.

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 Emulsion of systems containing egg yolk, polysaccharides and vegetable oil

2012 ◽  
Vol 36 (5) ◽  
pp. 543-550 ◽  
Author(s):  
Clitor Junior Fernandes de Souza ◽  
Edwin Elard Garcia Rojas
Keyword(s):  
Fatty Acid ◽  
Droplet Size ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Xanthan Gum ◽  
Emulsion Stability ◽  
Egg Yolk ◽  
Emulsifying Properties ◽  
Emulsifying Activity ◽  
Excellent Stability

This work characterizes the emulsifying properties of systems containing egg yolk (0.1; 1.0 and 2.5 % w/v) and polysaccharides (xanthan gum, carrageen, pectin and carboxymethylcellulose) and three different vegetable oils (sunflower, canola, and palm oils). Emulsifying activity and emulsion stability were measured of each combination and it was found the effect of the oil on emulsion stability correlated to the amount of monounsaturated fatty acid. Additionally, increased egg yolk concentration increased emulsifying activity by reducing coalescence of oil droplets. Lastly, 2.5% egg yolk and 0.2% polysaccharide generated emulsions with high emulsifying activity, excellent stability, and droplet size of 4.32 µm.

scholarly journals ANÁLISE DE PESTICIDAS ORGANOCLORADOS EM ÓLEOS VEGETAIS POR CROMATOGRAFIA GASOSA DE ALTA RESOLUÇÃO (HRGC)

2018 ◽  
Vol 35 (3) ◽  
pp. 189
Author(s):  
Eudécio Bonfim dos Santos Dias ◽  
Eliane Da Costa Vilela ◽  
Fernando Mauro Lanças
Keyword(s):  
Solid Phase Extraction ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Concentration Level ◽  
Solid Phase ◽  
Agricultural Products ◽  
Phase Extraction ◽  
Human Diet ◽  
Animal Fats ◽  
Chemical Products

Vegetable oil were introduced in human diet in the last decade to change the use of animal fats. The chemical products althrought utilized in correct manner can cause residues in food bring to healt there be a necessity of a constant monitoring of the concentration level the several agricultural products. The answer to this necessity has motivated the development of several of a methodology for simultaneous analysis of aldrin, dieldrin, endrin and endosulfanin vegetable oils by HRGC, using solid phase extraction (SPE) using silica and XAD-2. The recovery was 70-110%.

scholarly journals Spent Coffee Ground Oil as a Potential Alternative for Vegetable Oil Production: Evidence from Oil Content, Lipid Profiling, and Physicochemical Characterization

2021 ◽  
Vol 12 (5) ◽  
pp. 6308-6320
Keyword(s):  
Vegetable Oil ◽  
Vegetable Oils ◽  
Physicochemical Characterization ◽  
Oil Production ◽  
Good Alternative ◽  
Sterol Composition ◽  
Lipid Profiling ◽  
Spent Coffee Ground ◽  
Potential Alternative ◽  
Pharmaceutical Uses

In this work, routinely measured physicochemical indices and lipid profiling of oil extracted from spent coffee grounds (SCG) were evaluated to assess the suitability of SCG as a new candidate for oil production. The obtained results reveal that the oil yield was 18.55±1.5 g/100g. Physicochemical indices were comparable to those of widely consumed vegetable oils in the range set in several studies. The main fatty acids of SCG oil were linoleic acid 43.20±2.19 g/100g, palmitic acid 31.78±2.02 g/100g, and oleic acid 12.68±1.15 g/100g dry basis. For sterol composition, β-sitosterol was the most abundant sterol (44.70±0.01%), followed by stigmasterol (27.57±0.01%) and campesterol (12.16±0.01%). In conclusion, this composition is typical for many other vegetable oils. Therefore, this oil may be considered a good alternative for vegetable oil production for new multi-purpose products such as cosmetic and industrial pharmaceutical uses.

scholarly journals Factor relationship of the parameters of the harmonic oscillatory system when cleaning the filtration surface of the plant for vegetable oil regeneration

2020 ◽  
pp. 100-102
Author(s):  
Phelix Yakovlevich Rudik ◽  
Natalya Lvovna Morgunova ◽  
Evgeniy Aleksandrovich Sundukov
Keyword(s):  
Shelf Life ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Oscillatory System ◽  
Solid Particles ◽  
Design Parameters ◽  
Small Enterprises ◽  
Relationship Of ◽  
Filtration Surface

When processing oilseeds, technologies are needed to obtain valuable vegetable oils by pressing with a long shelf life. Existing technologies for cleaning vegetable oils in small enterprises do not allow cleaning the oil from all undesirable substances and therefore the oils have a short shelf life, quickly oxidize and lose their presentation. The article theoretically substantiates the design parameters of a directional ultrasonic and mechanical oscillatory system for cleaning the filtration surface of the installation from accumulated solid particles in the oil.

Sign in / Sign up

Export Citation Format

Share Document