Composite wood products
Seyedeh Zahra Hosseini; Ali akbar Enayati
Abstract
This study has been undertaken to investigate effects of synthetic waste fibers of polyester in improving mechanical properties of wood plastic composites. Two types of polyester fibers (carpet fibers and polish fibers), high density polyethylene along with 40 wt% wood flour of populus, 2 wt% of maleic ...
Read More
This study has been undertaken to investigate effects of synthetic waste fibers of polyester in improving mechanical properties of wood plastic composites. Two types of polyester fibers (carpet fibers and polish fibers), high density polyethylene along with 40 wt% wood flour of populus, 2 wt% of maleic anhydride grafted polyethylene (MAPE) and ethylene- glycidyl methacrylate copolymer (E-GMA) as coupling agent were used. After two-stage mixing, resulted granules were hot pressed (at160℃, under 10 Mpa pressures) to produce test boards measuring 20×20×0.7 cm in dimensions. Results from measurement of mechanical properties of the samples have shown that with increasing the amount of polyester fibers (carpet fibers and polish fibers), tensile modulus of elasticity of wood plastic composites decreases and increases his flexural modulus of elasticity. Also by increasing amount carpet fibers, the tensile, flexural strengths of wood plastic composites-carpet fibers increases and the maximum of flexural strength is in a sample that contained 20 wt% carpet fibers. But about the plush fiber, 10 wt% of it is efficient for increasing the flexural and tensile strengths of wood plastic composites-plush fibers. Then on the composites contained the optimal polyester (polish fiber 10% and carpet fibers 20%) for increasing the mechanical strength, TGA and DSC testes for experience the thermal behavior of the composites were analyzed. Thermal analyses results have shown that with addition of polyester in the wood composite plastic, are reduced the percentage of crystallization, temperature of crystallization and the temperature of stability and degradation thermal of the composite.Morphologic study by Scanning Electron Microscopy indicates that with the increasing percentage of polyester fibers, is more denser and smoother the integration between the fracture surface of the composite material.
Composite wood products
Fatemh Rezaei; Ali akbar Enayati
Abstract
In this research, the effect of vine pruning fibers in combination with wood fibers on contact angel (wettability) and surface bond strength of medium density fiberboard was studied. One layer laboratory panels with a thickness of 15 mm and density of 650 Kg/Cm3 were produced. Variable factors were vine ...
Read More
In this research, the effect of vine pruning fibers in combination with wood fibers on contact angel (wettability) and surface bond strength of medium density fiberboard was studied. One layer laboratory panels with a thickness of 15 mm and density of 650 Kg/Cm3 were produced. Variable factors were vine pruning fibers content in three levels of 0/100, 30/70 and 60/40 by weight and press time in three levels of 4, 5 and 6 minutes. The wet ability and surface bond strength of panels were measured. Results showed that the contact angle of the boards was reduced when the vine pruning fibers content increased up to 60%. Press time had significant influence on wet ability of test panels. So that the contact angle was increased with increasing the press time up to 5 minutes. Whereas the contact angle was reduced when the press time of panels increased to 6 minutes. In addition, the results indicated that the sanding of panels caused a decrease of contact angle in the boards. Moreover the surface bond strength of panels were reduced with adding vine pruning fibers up to 30% whereas the panels produced using 60% vine pruning fibers showed stronger.
Composite wood products
Aliakbar Aenayati; Halimeh Pangh; Mahammad Layeghi; Kazem Doosthosseini
Abstract
This study was conducted to investigate the effect of Cu nano particles addition on the density profile and mechanical properties of medium density fiberboard. One layer fiberboard (MDF) with the density of 0.58g/cm3and thickness of 17 mm were produced using Cu nano particles in three levels (5, 10 and ...
Read More
This study was conducted to investigate the effect of Cu nano particles addition on the density profile and mechanical properties of medium density fiberboard. One layer fiberboard (MDF) with the density of 0.58g/cm3and thickness of 17 mm were produced using Cu nano particles in three levels (5, 10 and 15wt%based on solid content of resin) and urea formaldehyde resin content in two levels (8 and 10wt%based on oven dry weight of fibers) as variable factors. The control panels were produced using 10% resin (based on oven dry weight of fibers) without Cu nano particles using the identical manufacturing parameters as other panels. Mechanical strength including internal bonding (lB), bending strength, modulus of elasticity and density profile using slicing method were determined. The results indicated that increasing the content of Cu nano-particles had no significant effect on the internal bonding as well as bending strength and modulus of elasticity of panels. Increasing the resin content from 8 to 10 percent improved modulus of elasticity (43.7%), bending strength (18.9%) and internal bonding (23%) of panels. In addition, the increasing Cu nano particles up to 5% caused relatively higher IB for panels produced using 8%resin compared to the control panels(containing10% resin) as well as the density profile was more uniform with the lowest differences between maximum and minimum density in the density profile.
Management and Economics wood
Aliakbar Aenayati; Hamid Hatefnia
Abstract
Microbiological degradation of wood and wood products is one of the most important of disadvantage which reduce its useful life. There are various methods to increase the natural durability of wood and wood products and most of them using chemical reagents. In the past, the thermal ...
Read More
Microbiological degradation of wood and wood products is one of the most important of disadvantage which reduce its useful life. There are various methods to increase the natural durability of wood and wood products and most of them using chemical reagents. In the past, the thermal modification has been used as a ecofriendly method in many times. In this research the effects of steam pretreatment on the fungal durability of particleboard were studied. Steam pre-treatment was applied on the poplar wood particles using a stainless steel reactor at four temperature levels (155, 165, 175 and 185 ºc) and three retention times (15, 30 and 45 min). The amount of hemicelluloses, acetone extractives of wood particles as well as EMC and Mass loss of test panels were measured.The results indicated that the steam pretreatment significantly decreased the amount of hemicelluloses of wood particles, EMC and mass loss of test samples where as the amount of extractives of wood particles increased.According to the results, the variation of Mass loss of particleboard test samples showed a significant correlation to the variation of EMC of test samples, hemicelluloses and extractives amount of wood particles when the wood particles thermally pre-treated at 165ºC for 30 minutes
Seaid Masoumeh Hafezi; Ali akbar ٍEnayati; Kazem Doosthosseiny; Asghar Taremian; Ahmad Mirshokraee
Abstract
This research was conducted to investigate the effect of silane coupling agent usage to improve the bond formation of urea formaldehyde resin in wheat straw particleboard production. Three levels (0.5% and 10%; based on the dry weight of the resin) of silane coupling agent and 10% urea formaldehyde resin ...
Read More
This research was conducted to investigate the effect of silane coupling agent usage to improve the bond formation of urea formaldehyde resin in wheat straw particleboard production. Three levels (0.5% and 10%; based on the dry weight of the resin) of silane coupling agent and 10% urea formaldehyde resin were used to produce one layer particle boards with 16mm nominal thickness. Physical and mechanical properties including MOR, MOE, IB and thickness swelling (after 2 and 24 hours immersion in water) were measured. The results of this study showed that adding silane coupling agent to the resin in wheat straw particleboard production, increased MOR, MOE and IB and dimensions stability improved. Optimum dosage for silane coupling agent to improve modulus of elasticity, internal bonding and thickness swelling was 10% and the for modulus of rupture, it was determined as 5%.
Mahid Farzi; Ali akbar Enayati; Davood Parsa paghoh
Abstract
In this investigation, soda pulps from old rags applying three pulping times (60, 120 and 180 minutes ) and three levels of active alkali ( 6,8, and 10% NaOH based on OD weight of rag) and pulping temperature of 125º C were produced. Liquor to rag ratio was kept constant at 11:1(based on the ...
Read More
In this investigation, soda pulps from old rags applying three pulping times (60, 120 and 180 minutes ) and three levels of active alkali ( 6,8, and 10% NaOH based on OD weight of rag) and pulping temperature of 125º C were produced. Liquor to rag ratio was kept constant at 11:1(based on the weight of the rag). After pulping, hand sheets were made and then both strength and optical properties of hand sheets were measured. It was revealed that, the optimum condition for rag pulping was; 8% active alkali and 120 minutes. At this pulping conditions, the pulping yield and mechanical and optical properties of pulp were measured as yield; 86.46 %, tear index; 20.12 mN.m2/g, burst index; 2.09 kPa.m2/g, breaking length; 1.96 km, brightness; 95.86 % and opacity: 96.39
Ali akbar Enayati; Hossein Nazerani hoshmand; Kazem Dost hosseini; Ahmad Jahan latibari; Sohrab Rahimi
Abstract
In order to study the optimum manufacturing conditions of wood sawdust-cement perforated blocks, sawdust of headrige saw was mixed with portland cement type II, and then perforated blocks were molded from this mixture. The mixture ratios of sawdust to cement were selected as 28:72, 35:65 and 42:58, ...
Read More
In order to study the optimum manufacturing conditions of wood sawdust-cement perforated blocks, sawdust of headrige saw was mixed with portland cement type II, and then perforated blocks were molded from this mixture. The mixture ratios of sawdust to cement were selected as 28:72, 35:65 and 42:58, respectively. CaCl2 (Calcium chloride) or MgCl2 (Magnesium chloride) at two levels (3%,5% based on the weight of the cement) were used as additives. The results of physical (thickness swelling after 2 and 24 hours soaking in water) and mechanical (compressive strength) properties of the blocks revealed that varying the sawdust to cement ratio imparted differences in physical and mechanical properties of the blocks. The blocks with sawdust to cement ratio of 42:58 showed the highest compressive strength and blocks with sawdust to cement ratio of 28:72 showed the lowest thickness swelling. It was observed that the type of additive did not impose any significant effect on physical and mechanical properties of blocks. Whereas the effect of MgCl2 level on the properties was significant
Mohammad ali Sadat nia; Ali akbar Enayati; Loeic Brancheriau; Kambiz Pourtahmasi; Farhang Honarparvar
Abstract
The acoustic behavior of reaction and normal woods, phase velocity, group velocity and attenuation coefficients in the main directions for two wood species (Populus deltoids & Picea abies), were measured and compared. The results did not show any significant difference between phase velocities of ...
Read More
The acoustic behavior of reaction and normal woods, phase velocity, group velocity and attenuation coefficients in the main directions for two wood species (Populus deltoids & Picea abies), were measured and compared. The results did not show any significant difference between phase velocities of normal and tension wood at the same ring in poplar wood. But in compression wood from spruce, phase velocity in longitudinal direction was lower; while in transverse direction was higher compared to normal wood. Group velocity as an index of speed of wave energy in compression wood also was less than that in normal wood. In radial and tangential directions, there was no significant difference between group velocity of compression and normal woods of spruce. In poplar species, in all main directions, the measured group velocities, both for tension and normal woods were identical. The result also showed that the attenuation coefficients in reaction wood of two wood species (poplar and spruce) were less than those of normal wood in all directions. In compression and tension woods, a high correlation was observed between acoustic radiation and wood density.
Composite wood products
Hamid Hatefnia; Ali akbar Enayati; Kazem Dost hosseini; Mohammad Azadfallah
Abstract
Poplar wood chips were treated by steaming in different conditions. The chemical composition changes of milled wood were studied. The obtained results indicate hemicelluloses degradation, reduction of acetyl groups and formation of organic acid during the treatment. It was also found that steam treatment ...
Read More
Poplar wood chips were treated by steaming in different conditions. The chemical composition changes of milled wood were studied. The obtained results indicate hemicelluloses degradation, reduction of acetyl groups and formation of organic acid during the treatment. It was also found that steam treatment has led to degradation of low-molecular lignin units, decrease in cellulose amorphous regions, increase of acetone extractives and hot water solubility as well as one percent sodium hydroxide solubility. The FT-IR spectra indicated a structural change of aromatic polymers in the wood, cleavage of the acetyl group of hemicelluloses and formation of organic acid.
Composite wood products
Ali akbar Enayati; Farnaz Eslah
Abstract
This study was conducted to investigate the effect of mixing great size wood particles of poplar with appropriate size particles of the same species, on density profile and physical -mechanical properties of the made particleboard, this study was carried out. One layer boards were made by use of appropriate ...
Read More
This study was conducted to investigate the effect of mixing great size wood particles of poplar with appropriate size particles of the same species, on density profile and physical -mechanical properties of the made particleboard, this study was carried out. One layer boards were made by use of appropriate and great size residue particles on a 7mm pores screen with the ratio of 0/100, 15/85, 30/70, and 45/55 respectively. The results obtained from measured physical and mechanical properties showed that increasing great particles ratio had no negative effect on properties of boards. Increasing the amount of this particles in boards composition, caused increasing internal bonding and decreasing water absorption and thickness swelling levels. In addition, there were no significant differences within boards made from different treatments MOR and MOE properties. Regarding results of this study, when %15 great particles was used with appropriate particle ones, boards had minimum reduction of mechanical strength. Investigation of density profile showed the same result. But all properties of the boards were over the determined limit in terms of relevant standard values even in the case of using 45% great particles.
Composite wood products
Fatemeh Taheri; Ali akbar Enayati; Abdol rasol Oromihei; Mehdi Tajvidi
Abstract
By utilizing three different grades of Polypropylene (PP) as matrix, two different kind of MAPP as coupling agent and without MAPP and Pistachio's flour, composite samples were produced. Physical and mechanical properties of wood plastic composites including: MOR, MOE, tensile strength, bending ...
Read More
By utilizing three different grades of Polypropylene (PP) as matrix, two different kind of MAPP as coupling agent and without MAPP and Pistachio's flour, composite samples were produced. Physical and mechanical properties of wood plastic composites including: MOR, MOE, tensile strength, bending strength, impact strength, hardness, water absorption and thickness swelling (816 hours) were determined. Results indicated that the effect of different grade of polypropylene and coupling agent on water absorption, thickness swelling, hardness and impact strength variables were insignificant. Use of Polypropylene having higher Melt Flow Index (MFI) leads to increase in mechanical properties of wood plastic composite samples such as Bending and Tensile strength even if coupling agent wasn't used. Use of different kind of MAPP as coupling age in making wood plastic composites can result in better mechanical properties which based on their type have different effect.
Composite wood products
Hamid Hatefnia; Aliakbar Enayati; Kazem Dosthosseini; Mohammad Azadfalah
Abstract
In this research the effect of steam pretreatment on the physical and mechanical properties of particleboard were evaluated. Steam pre-treatment was applied on the particles of poplar wood in a stainless steel reactor at four different temperature (155, 165, ...
Read More
In this research the effect of steam pretreatment on the physical and mechanical properties of particleboard were evaluated. Steam pre-treatment was applied on the particles of poplar wood in a stainless steel reactor at four different temperature (155, 165, 175 and 185 ◦C) and three different retention time (15, 30 and 45 min). The obtained results indicated that mechanical properties include MOR and IB content of the particleboard decreased, whereas MOE increased initially then decreased with severity of treatment conditions. The physical properties of the board i.e. thickness swelling, water absorption and consequently dimensional stability were improved by steam pretreatment. The observed changes can be attributed to reduction in hemicelluloses content and hydroxyl groups within wood component.
Composite wood products
Mohammad Arabi; Mohammad mehdi Faezipoor; Mohammad Layeghi; Ali akbar Enayati
Abstract
The purpose of this study was to investigate which equation (Linear, Exponential equation and quadratic) can describe exactly the interaction effect of particle size and adhesive percent and predict mechanical properties of particleboard (modulus of rupture, modulus of elasticity and bending strength). ...
Read More
The purpose of this study was to investigate which equation (Linear, Exponential equation and quadratic) can describe exactly the interaction effect of particle size and adhesive percent and predict mechanical properties of particleboard (modulus of rupture, modulus of elasticity and bending strength). For this work three levels of density including 0.65, 0.7, and 0.75 g/cm3 and also, three levels of adhesive content including 8, 9.5, and 11% and four levels of slenderness ratio of particles including 46.35, 33.7, 21.51 and 12.87 were used. After conducting the experiment and preparing the data, three kind of equation (linear, quadratic and Exponential equation) for each mechanical property based on slenderness of particles, density and adhesive percent obtained. The result indicated there was no correlation between mechanical properties of particleboard and quadratic equation but there were good correlations between linear and Exponential equation. Also the result indicated that Exponential equation can describe efficiently the simultaneous effect of slenderness and adhesive present on the mechanical properties of particleboard, and it can predict better mechanical properties than linear equation.
Pulp and paper
Mohammad Molaei; Aliakbar Enayati; Yahya Hamzeh; Maryam Rostaei
Abstract
A fundamental study was carried out to explore the canola stalks properties in order to increase the use of abundant agricultural residuals in pulp and paper production. In this study, the morphological, chemical composition and soda pulping properties of Canola stalks were investigated. The results ...
Read More
A fundamental study was carried out to explore the canola stalks properties in order to increase the use of abundant agricultural residuals in pulp and paper production. In this study, the morphological, chemical composition and soda pulping properties of Canola stalks were investigated. The results showed that except the thicker cell wall, the morphological properties of Canola stalks fibers were comparable to those of nonwoods and hardwoods fibers. Chemical analysis indicated that Canola stalks contains lower amount of cellulose (44%), while the lignin, hemicelluloses and ash content of Canola stalks are comparable to other non-woods. In comparison with most of non wood fiber resources, soda pulping of Canola stalks required higher chemical charge and pulping time. Soda pulping of Canola stalks in 22% active alkaline and 100 min in max temperature produced pulp with 82.6% ISO of brightness The strength properties of bleached Canola stalks soda pulp include tensile index (Nm/g), burst index (kpam2/g) & tear index (mNm2/g) showed respectively 63.6, 2.22 & 4.9.
Composite wood products
Ali akbar Enayati; Marzyeh Raeisi; Hamidreza Adalat
Abstract
For this study, the pruning of Apricot tree and industrial wood particles were used. The combination percent of Apricot wood particles (0, 15, 30 and 45) and press time (5 and 7 minute) were the variables of experiment. Results showed that with increasing the percent of Apricot wood particles, the amount ...
Read More
For this study, the pruning of Apricot tree and industrial wood particles were used. The combination percent of Apricot wood particles (0, 15, 30 and 45) and press time (5 and 7 minute) were the variables of experiment. Results showed that with increasing the percent of Apricot wood particles, the amount of MOE and MOR of panels enhance significantly. Despite the internal bonding (IB) strength of panels decreased with this enhancement, the strength of panels had higher amount than its standard amount. The water absorption resistance and the thickness swelling of panels for 24 hours were improved significantly with increasing the Apricot wood particles percent. In all cases, the effect of press time was not significant. Finally, the combination of 45% Apricot pruning and the shorter press time (5 min) was identified as the best treatment.
Composite wood products
Ali akbar Enayati; Davood Rasooli; Hossein Usefi
Abstract
In this study, plywood manufacture with use of polypropylene as a binder has been studied. The variables were polypropylene in three levels of 80, 120 and 160 g/m2 and maleic anhydride polypropylene coupling agent in two levels of 0 and 4 g/m2 . ureformaldehyde and wheat flour were ...
Read More
In this study, plywood manufacture with use of polypropylene as a binder has been studied. The variables were polypropylene in three levels of 80, 120 and 160 g/m2 and maleic anhydride polypropylene coupling agent in two levels of 0 and 4 g/m2 . ureformaldehyde and wheat flour were used for control samples(120 and 40 g/m2 respectively). Physical and mechanical properties including MOR and MOE (parallel and perpendicular to grain of face layers), water absorption and thickness swelling after 2 and 24 hours of immersion in water were tested. The results showed that maleic anhydride polypropylene coupling agent has significant effect on MOR parallel to grain of face layers. With increase of maleic anhydride polypropylene coupling agent, MOR increased. Polypropylene has positive effect on thickness. With increase of maleic anhydride polypropylene coupling agent, water absorption after 24 hours improved. Although the results revealed improvement in board properties resulted from more polypropylene use but in all properties (except thickness swelling after 24 hours), control samples had better quality than plywood made from polypropylene.
Composite wood products
Hossein Usefi; Ali akbar Enayati; Mohammad mehdi Faezi poor; Sayed hamzeh Sadat nezhad
Abstract
Canola straw as a agricultural residues has been investigated for MDF production. The variables were the steaming time of 2, 5 & 8 minutes and the resin content of 9 and 11 present. Other factors being kept constant. Some of the physical and mechanical properties such as thickness swelling (TS), ...
Read More
Canola straw as a agricultural residues has been investigated for MDF production. The variables were the steaming time of 2, 5 & 8 minutes and the resin content of 9 and 11 present. Other factors being kept constant. Some of the physical and mechanical properties such as thickness swelling (TS), water absorption (WA) modulus of rupture (MOR), modulus of elasticity (MOE), internal bond (IB), were measured. In addition, canola straw fiber properties such as fiber length, diameter and cell wall thickness were determined. The results showed that the optimum condition for MDF production from canola straw is the treatment of 5 minutes steaming time and 11% resin content. All the tested mechanical and thickness swelling properties improved with the increase of steaming time level. Dimensional stability of the MDFs improved as resin content increased. WA and TS values of the produced boards were relatively high because no wax and no depithing were used during the board production. More over, the values of canola straw fiber length, diameter and cell wall thickness are 1215, 28, 7.43 micrometer respectively.
Composite wood products
Ali akbar Enayati; Hossein Usefi; Davood Rasoli
Abstract
The effect of Apple pruning wood particles in mixed with industrial wood particles for particleboard manufacturing was studied. One layer laboratory panels with density of 0.6 gr/cm3 with two variables amount of Apple pruning wood particles content (0/100, 15/85, 30/70, 45/55 percent weight of Apple ...
Read More
The effect of Apple pruning wood particles in mixed with industrial wood particles for particleboard manufacturing was studied. One layer laboratory panels with density of 0.6 gr/cm3 with two variables amount of Apple pruning wood particles content (0/100, 15/85, 30/70, 45/55 percent weight of Apple pruning particles/wood particles) and a press time of 5 and 7 min were produced. The physical and mechanical properties of panels were measured. The results showed that the amount of Apple pruning wood particle had significant influence on the most physical and mechanical properties of panels such as MOR, MOE, IB, TS and WA while they were improved as the Apple pruning wood particles increased. The results also indicated that press time had significant influence on the IB and TS of panels and they were increased as the press time increased.
Omid Ramazani; Ahmad Jahan latibari; Mohammad mehdi Faezipoor; Ali akbar Enayati; Sayed mehdi Manzor alajdad
Abstract
Apparent Density of paper is the most effective physical property which directly and indirectly affects most of the strength and optical properties of paper such as tensile strength, modulus of elasticity, light scattering coefficient as well as the bonded area between fibers. Since paper making variables ...
Read More
Apparent Density of paper is the most effective physical property which directly and indirectly affects most of the strength and optical properties of paper such as tensile strength, modulus of elasticity, light scattering coefficient as well as the bonded area between fibers. Since paper making variables influences the apparent density of paper, in this study, the influence of OCC pulp freeness, and drying conditions are investigated. The influence of three freeness levels of 350,450, and 550 CSF, drying under strain and unstrained, drying temperatures of 100, 150, 200 C and drying pressure of 7 and 10 kg/cm2 are studied. The relationship between paper making variables and apparent density is developed. All measurements of apparent density were analyzed using Minitab 15 and regression model between independent variables was calculated. The results showed that both pulp freeness and drying temperature had the highest impact on apparent density and both factors increased the apparent density. The response of apparent density of the hand sheets dried at 200 ◦C varied considerably and was analyzed thoroughly. Higher pressure increased apparent density of the sheets. The combined effect of variables is also considered. The combined effect of pulp freeness and drying temperature caused lignin softening and delamination. However, the influence of increasing the drying pressure for unrefined and less refined pulp is not significant. Furthermore, for unstrained drying, the influence of freeness on apparent density was more than strained drying. Manufacturing of more desirable quality papers would be possible considering the obtained results and the effect of Apparent Density on paper strength properties.
Composite wood products
Yasamin Khosrevani; Ali akbar Enayati; Alinaghi Karimi; Behbood Mohebi
Abstract
The effects of different levels of wood particles acetylation and resin content on the physical and mechanical properties of particleboard were investigated. Boards were made within 6 treatments at three different levels of acetyl content (WPGs of 0%, 5.11% and 10.76 %) and two levels of resin content ...
Read More
The effects of different levels of wood particles acetylation and resin content on the physical and mechanical properties of particleboard were investigated. Boards were made within 6 treatments at three different levels of acetyl content (WPGs of 0%, 5.11% and 10.76 %) and two levels of resin content (8 and 10 %).The results indicated that by increasing the level of particles acetylation, the density of boards was reduced whereas resin content increased this property. Equilibrium moisture content, water absorption and thickness swelling of the boards were reduced by 15.3%, 26.6% and 14.9%, respectively under optimum conditions as compared with control samples at higher acetylation levels and resin contents.MOR, MOE and IB decreased by increasing acetylation level but increasing resin content from 8 to 10 %, improved mechanical properties except for MOR which was not significantly affected by resin content. The result of this research have indicated that using 5.11% acetylation level and 10% resin content, it is possible to produce particleboard having enhanced physical properties with negligible loss of mechanical properties.
Sayed mahmood Kazemi; Aliakbar Enayati; Heshmatalah Rahymian
Abstract
The durability of following five wood species: Zelkova carpinifolia, Ulmus glabra, Pterocarya fraxinifolia, Carpinus betulus and Acer laetum were studied. Wood blocks exposed to Trametes versicolor(a white rot fungus) under laboratory conditions according to DIN52176 standard. After 16 weeks incubation ...
Read More
The durability of following five wood species: Zelkova carpinifolia, Ulmus glabra, Pterocarya fraxinifolia, Carpinus betulus and Acer laetum were studied. Wood blocks exposed to Trametes versicolor(a white rot fungus) under laboratory conditions according to DIN52176 standard. After 16 weeks incubation the heart wood of Z. carpinifolia showed 2.19% reduction in weight loss, while U glabra with 41.69%, C. betulus with 45.64%, A. laetum with 53.03% and P. Fraxinifolia with 43.08% weight losses were very decayed. For finding relationship between amount of wood decay and wood extractives a regression was carried out. The percentages of extractive materials by using T20403 standard were 13.84% in Z. carpinifolia, 4.51% in U. glabra, 2.74% in C. betulus, 3.88% in A. laetum, and 4.11% in P. fraxinifolia. Finally there was a negative correlation between rate of decay and amount of wood there was expect P. fraxinifolia. for all wood species extractives.
Abolfazl Kargarfard; Ali akbar Enayati; Ahmad Jahan latibari; Abdolrahman Hosseinzadeh; Amir Nourbakhsh
