Composite wood products
Mohammad Farajalah poor; Kazem Dosthosseini
Abstract
Effects of mat moisture content (MC) and Cu nanoparticles on heat transfer and physical and mechanical properties of poplar particleboard were investigated. Three levels of mat moisture content (9, 12 and 15%. based on oven dried wood particles) and two levels of Cu nanoparticles (0 and 15% based on ...
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Effects of mat moisture content (MC) and Cu nanoparticles on heat transfer and physical and mechanical properties of poplar particleboard were investigated. Three levels of mat moisture content (9, 12 and 15%. based on oven dried wood particles) and two levels of Cu nanoparticles (0 and 15% based on oven dried resin) were selected as variable factors. Results indicated that mechanical properties of particleboard improved as MC increases. Cu nanoparticles accelerated the heat transfer from the surface layer to the core layer of the mat and subsequently increased the internal bonding. This positive effect was evident as MC increased. Water absorption and thickness swelling increased as either MC or Cu nanoparticles content was raised. It was observed that the efficiency of Cu nanoparticles on heat transfer was superior at higher MC. Energy Dispersive X-Ray Spectroscopy (EDS) and Scanning Electron Microscopy (SEM) determination revealed that the presence and very well dispersion of Cu nanoparticles in glue line.
Composite wood products
Sayed mohammad javad Mosavi hosseini; Mohammad mehdi Faezipoor; Hossein Usefi
Abstract
The effect of using nanoclay on MDF properties was investigated. Sodium montmorolonit (NA+MMT) was used in three levels of 0, 3 and 6 percent based on dry weight of two resins of urea formaldehyde (UF) and Methylene diphenyl diisocyanate (MDI). Modulus of rupture (MOR), modulus of elasticity (MOE), internal ...
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The effect of using nanoclay on MDF properties was investigated. Sodium montmorolonit (NA+MMT) was used in three levels of 0, 3 and 6 percent based on dry weight of two resins of urea formaldehyde (UF) and Methylene diphenyl diisocyanate (MDI). Modulus of rupture (MOR), modulus of elasticity (MOE), internal bonding (IB), thickness swelling (TS) and water absorption (WA) of MDF were measured based on EN standard. Results demonstrated that with the increase of nanoclay in both UF and MDI resins MOR and MOE of MDF increased significantly in such a way that with the use of UF containing 6% nanoclay MOR increased by 33%. Although, IB was significantly affected by UF containing nanoclay, MDI containig nanoclay caused reduction in IB. WA and TS of MDF made from MDI did not show significant variation by increase of nanoclay but those made from UF resin positively affected by adding nanoclay in such a way that MDF made from 3% nanoclay showed 41% loss in TS compared to those made from pure UF.
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 ...
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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
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 ...
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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 ...
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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), ...
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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 ...
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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.
Physics and anatomy
Fardad Golbabaei; Ghanbar Ebrahimi; Abolfazl Kargarfard; Abbas Fakhryan roghani
Abstract
Oak (Quercus castaneafolia C.A. Mey) is one of the most important broadleaf species in the Caspian Forests of Iran. The wood of oak is highly appreciated in domestic wood industries especially furniture industry.
In this study which is a part of the extensive surveying project of the main wood engineering ...
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Oak (Quercus castaneafolia C.A. Mey) is one of the most important broadleaf species in the Caspian Forests of Iran. The wood of oak is highly appreciated in domestic wood industries especially furniture industry.
In this study which is a part of the extensive surveying project of the main wood engineering properties of Iranian woods, the natural variations of strength and related properties of two trees of about 70 years old from Shafarod Forests in Gilan province were investigated.
The properties were determined from tests on small clear specimens in the green and dry conditions following the ASTM Standard. The mechanical and physical properties studied include: stress at elastic limits, modulus of rupture, modulus of elasticity and modulus of elasticity in static bending; shear parallel to grain, maximum crushing strength, fiber stress at proportional limit and modulus of elasticity in compression parallel to grain; compression perpendicular to grain and specific gravity.
The results of statistical analysis showed that the mechanical strength of the wood was found to be affected by percentage of moisture content of wood specimens, height of sample tree and to some extend by geographical; cal direction.
Composite wood products
Aliakbar Ramtin; Kazem Doosthosseini; Behnaz Dadkhah tehrani; Mohammad ali Podinehpoor; Majid Chaharmahali
Abstract
The objective of this research was to characterize the physical and mechanical properties of Aspen OSB made with different percentage of resin as well as in different orientation of strand. Mechanical and physical properties such as bending strength. interlaminated shear strength, water absorption and ...
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The objective of this research was to characterize the physical and mechanical properties of Aspen OSB made with different percentage of resin as well as in different orientation of strand. Mechanical and physical properties such as bending strength. interlaminated shear strength, water absorption and thickness swell were measured on the resulting orientation strand board. Among sample boards with high percentage of resin amount showed superior mechanical and physical performance. Results also showed, when strand were oriented in boards) physical and mechanical properties were improved.
Physics and Mechanical Wood
Fardad Golbabaei; Amir Nourbakhsh; Abbas Fakhryan roghani; Shahrokh Falahdoost
Abstract
Beech (Fagus orientalis Lipsky L.) is one of the most important broadleaf species in the Caspian Forests of Iran. The wood of Beech is highly appreciated in domestic wood industries especially furniture industry. In this study which is a part of the extensive surveying project of the main wood engineering ...
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Beech (Fagus orientalis Lipsky L.) is one of the most important broadleaf species in the Caspian Forests of Iran. The wood of Beech is highly appreciated in domestic wood industries especially furniture industry. In this study which is a part of the extensive surveying project of the main wood engineering properties of Iranian woods, the natural variations of strength and related properties of three trees of about 75 years old from Sangdeh Forests in Mazandran province were investigated.The properties were determined from tests on small clear specimens in the green and dry conditions following the ASTM Standard. The mechanical and physical properties studied include: stress at elastic limits, modulus of rupture, modulus of elasticity and modulus of elasticity in static bending; shear parallel to grain, maximum crushing strength, fiber stress at proportional limit and modulus of elasticity in compression parallel to grain; compression perpendicular to grain and specific gravity.The results of statistical analysis showed that the mechanical strength of the wood was found to be affected by percentage of moisture conten of wood specimens, height of sample tree and to some extend by geographical; direction.
Physics and Mechanical Wood
Fardad Golbabaei; Amir Nourbakhsh; Abbas Fakhryan roghani; Shahrokh Falahdoost
Abstract
In this study physical and mechanical properties of Hornbeam wood (Carpinus betulus L.) grown at two different elevations of Golestan Forests located in the north east of Caspian Sea were investigated based on the ASTM Standard.Selected trees were cut from two different elevations, at different heights ...
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In this study physical and mechanical properties of Hornbeam wood (Carpinus betulus L.) grown at two different elevations of Golestan Forests located in the north east of Caspian Sea were investigated based on the ASTM Standard.Selected trees were cut from two different elevations, at different heights in the trunk, at 4 different geographical directions of the trunk and also 2 different moisture contents.The results of statistical analysis showed that properties of Hornbeam wood from this region were influenced by elevations and to the lessees extend by geographical direction of wood specimens and tree heights.
Composite wood products
Abdolrahman Hosseinzadeh; Amir Nourbakhsh; Abolfazl Kargarfard; Fardad Golbabaei; Morteza Nazeryan
Abstract
Decreasing availability of raw material for Iranian wood industries and the need to conserve our limited natural forests initiated research concerning the utilization of fast-growing species in particleboard production. The objective of this study was to investigate the possibility of particleboard production ...
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Decreasing availability of raw material for Iranian wood industries and the need to conserve our limited natural forests initiated research concerning the utilization of fast-growing species in particleboard production. The objective of this study was to investigate the possibility of particleboard production from wood of two- year- old coppices of 17 experimental populus clones grown under intensive culture in the "Alborz Research Center" near Tehran. The furnish contained mixture of stem and branch wood with bark used to make 51 sample boards (3 board from each clone). Modulus of elasticity (MOE), modulus of rupture (MOR), internal bond strength (IB), thickness swelling and water absorption of the specimens were tested. The results indicate that sample boards made from Populus euramericana costanzo and populus euramericana 561.41 had significantly the highest MOR and MOE. But there was no significant differences in the internal bonding strength between different clones, while, those sample boards made from populus nigra betulifolia and Populus nigra nivea showed significantly the lowest percentages of thickness swelling. The average physical and mechanical properties of the particleboard samples produced from two- year- old coppices of poplar clones compared favourably to boards made from natural grown beech wood. Therefore, using UF resin, particleboard with acceptable quality particleboards can be produced from two- year- old poplar clones.
Physics and Mechanical Wood
Fardad Golbabaei; Abdolrahman Hosseinzadeh; Amir Nourbakhsh; Hossein Hosseinkhani; Abbas Fakhryan roghani
Abstract
In this study physical and mechanical properties of Hornbeam (Carpinus betulus L.) grown at three different elevations of Asalem Forests located at the north west of Gilan were investigated following the ASTM Standard. Sample trees were selected from 3 different elevations, at different height of trees, ...
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In this study physical and mechanical properties of Hornbeam (Carpinus betulus L.) grown at three different elevations of Asalem Forests located at the north west of Gilan were investigated following the ASTM Standard. Sample trees were selected from 3 different elevations, at different height of trees, at 4 different geographical directions of the stems and 2 different moisture contents.The results of statistical analysis revealed that properties of Hornbeam wood from this region was influenced by elevations and to the lessees extend to geographical direction of wood specimens and tree height.
Physics and Mechanical Wood
Abdolrahman Hosseinzadeh; Fardad Golbabaei; Amir Nourbakhsh; Hossein Hosseinkhani
Abstract
In this study physical and mechanical properties of Beech (Fagus orientalis Lipsky) grown at two different elevations of Asalem Forests located an the north west of Gilan were investigated following the ASTM Standard. Sample trees were selected from 2 different elevations, at different high of trees, ...
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In this study physical and mechanical properties of Beech (Fagus orientalis Lipsky) grown at two different elevations of Asalem Forests located an the north west of Gilan were investigated following the ASTM Standard. Sample trees were selected from 2 different elevations, at different high of trees, at 4 different geographical directions of the stems and 2 different moisture contents.The results of statistical analysis revealed that properties of Beech wood from this region was influenced by elevations and to the lessees extend to geographical direction of wood specimens and tree highs.
