Composite wood products
Kazem Dost hosseini; Farank Mohammad kazemi
Abstract
In this research the physical and mechanical properties of 3-layer particleboard manufactured by bagasse and forest wood particles have been studied. The amount of raw material and the type of adhesive were variation factors. First the effect of raw material on physical and mechanical properties has ...
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In this research the physical and mechanical properties of 3-layer particleboard manufactured by bagasse and forest wood particles have been studied. The amount of raw material and the type of adhesive were variation factors. First the effect of raw material on physical and mechanical properties has been evaluated in the six treatments. 60-40% and 80-40% treatments (bagasse-wood particles), regarding to bending strength, modulus of elasticity, internal bending strength, water absorption and thickness swelling after 2 & 24 hours soaking in water, have been selected as optimum treatments. Then the effect of types of adhesive on optimum treatments has been evaluated. The achieved results show that the particleboards manufactured by isocyanate adhesive have the highest MOE and lowest water absorption and thickness swelling after 2 & 24 hours soaking in water. In this research, according to the results of analysis of variance and the interception effect of raw material and type of adhesive on physical & mechanical properties of particleboards, 80-20% treatment (bagasse-wood particles) with isocyanate adhesive have been selected as preferable treatment
Composite wood products
Sayed Yahya Mosavi; Mohammad mehdi Jalili; Amir sohil Pirayesh far
Abstract
The main objective of this study was to examine, the use of thermo set epoxy resin and wood powder for making wood polymer composites. Results showed that mechanical properties of wood polymer composites that are manufactured were better than wood specimen. Also the water uptake of samples was measured ...
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The main objective of this study was to examine, the use of thermo set epoxy resin and wood powder for making wood polymer composites. Results showed that mechanical properties of wood polymer composites that are manufactured were better than wood specimen. Also the water uptake of samples was measured and the results showed the water absorption of wood polymer composite is too much less than wood sample. Images and infrared spectroscopy analysis support this fact that wood polymer composites are more stable than wood. Then the effects of adding wood powder to fiberglass composites were examined. The Results have clearly shown that adding appropriate amount of wood powder to fiber composites will considerably improve their physical and mechanical properties
Composite wood products
masoudreza habibi; Hossein Hosseinkhani; Saeed Mahdavi; Sayed javad Sepidehdam
Abstract
In this study, particleboard was produced by Eucalyptus and Poplar wood mixture. Variations of this study were as follow: - Combinations of Eucalyptus and Poplar wood were (%100 , %0) , (%66.5 ,% 33.5) , (%33.5 ,% 66.5) and (%0 ,% 100) respectively. ...
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In this study, particleboard was produced by Eucalyptus and Poplar wood mixture. Variations of this study were as follow: - Combinations of Eucalyptus and Poplar wood were (%100 , %0) , (%66.5 ,% 33.5) , (%33.5 ,% 66.5) and (%0 ,% 100) respectively. - Resin content ( %8 and %10) Physical and mechanical properties of boards such as MOR, MOE, IB TS2 and TS24 were tested according to EN standard. The effects of raw materials combinations on bending properties were significant. Maximum of MOE and MOR were observed in %66.5 of Poplar wood and % 33.5 of Eucalyptus wood. As expected, Physical and mechanical properties of boards were improved by increasing of resin content. Results indicated that TS2 and TS24 were increased with increasing of Poplar wood in combinations. Also the minimum of these properties were obtained in combinations of Eucalyptus and Poplar wood, %100, %0 respectively.
Composite wood products
Hassan Zyaei; Habib alah Khademi eslam; Behzad Bazyar; Noraldin Nazarneghad
Abstract
The aim of this study was to determine effect of coupling agent contents on the thermal properties and nanoclay dispersion of reed flour /polypropylene /nanoclay composites. For this purpose we considered wood flour 40% fixed maleic anhydride in two levels (5% and 10%) and nanoclay (Cloisite 10A) in ...
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The aim of this study was to determine effect of coupling agent contents on the thermal properties and nanoclay dispersion of reed flour /polypropylene /nanoclay composites. For this purpose we considered wood flour 40% fixed maleic anhydride in two levels (5% and 10%) and nanoclay (Cloisite 10A) in three levels (0, 1 and 3%). The materials were mixed in an internal mixer with 175 oC, 60 rmp for 10 minutes and then the specimens were fabricated by injection molding method. The clay structure and dispersion processes have been studied by X-ray diffraction. Thermal characterizations of the nanocomposites were carried out using Differential Scanning Calorimeter (DSC). The results revealed that Enthalpy, Crystallinity and Crystalline temperature of composites were increased by adding up of coupling agent and nanoclay (in some levels) contents. The XRD patterns show the exfoliation structure of nanoclay that indicated on a good dispersion of clay in polymer matrix, which turn in a reason for increasing thermal properties.
Composite wood products
Abolfazl Kargarfard; Amir Nourbakhsh; Fardad Golbabaei
Abstract
The objective of this study was to investigate of possibility of MDF production from successful Eucalyptus Species. Eucalyptus camaldulensis fibers were produced using different levels of steaming time ( 7.5 and 15 minutes), press temprature (170, 180 and 190 ºC ) and press time (3 and ...
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The objective of this study was to investigate of possibility of MDF production from successful Eucalyptus Species. Eucalyptus camaldulensis fibers were produced using different levels of steaming time ( 7.5 and 15 minutes), press temprature (170, 180 and 190 ºC ) and press time (3 and 4 minutes) and used for panel making. Physical and mechanical properties of panels were measured and analyzed. The results indicated that increasing of steaming time, lowered MOR of boards. The press temprature had significant effect on MOR, and with increasing press temprature, MOR increased. Furthermore increasing of steaming time, decreased the IB of boards and increasing steaming time from 7.5 to 15 minutes, decreased IB from 0.787 to 0.533 MPa. Increasing of steaming time, also decreased thickness swelling of boards. However, the results of this study showed that, the MOR and MOE of boards produced from Eucalyptus camaldulensis fibers are around standard level. But in other hand, the internal bonding and thickness swelling of boards are higher than level standard.
Composite wood products
masoudreza habibi; Hossein Hosseinkhani; Saeid Mahdavi; Fardad Golbabaei
Abstract
In this study Medium Density Fiberboard was produced from 4 year old Poplar clones (P.e. costanzo, P.e. 564.41, P.e. vernirubensis). Fibers length of P.e. costanzo, P.e. 564.41, P.e. vernirubensis were measured 805, 751 and 764 micron respectively. Also fibers diameter of these clones were determined ...
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In this study Medium Density Fiberboard was produced from 4 year old Poplar clones (P.e. costanzo, P.e. 564.41, P.e. vernirubensis). Fibers length of P.e. costanzo, P.e. 564.41, P.e. vernirubensis were measured 805, 751 and 764 micron respectively. Also fibers diameter of these clones were determined 25.76, 25.44, 25.23 micron respectively. Three steaming times (5, 10, 15 minutes) were used for fibers preparation. Also three press times (3, 4, 5 minutes) and two resin contents (9%, 11%) were applied for MDF production. Thus physical and mechanical properties of boards such as MOE, MOR, IB and Thickness Swelling after 2 and 24 hours were investigated. The physical and mechanical properties of boards were tested in based on EN standard. The measurements of bending properties and IB of MDF revealed that increasing steaming time caused to decrease MOE, MOR and IB. The highest of MOE, MOR and IB were obtained in 5 minutes steaming time. Also the lowest values of Thickness Swelling after 2 and 24 hours were obtained in 15 minutes steaming time. The influence of press time on bending properties was not significant. The highest of IB was obtained in 5 minutes press time. As expected, boards demonstrated better properties at higher resin content.
Physics and anatomy
Kazem Dost hosseini; Hamideh Abdolzadeh
Abstract
The feasibility of using of wood and old corrugated container (OCC) fibers on the surface layers of particleboards was investigated. The kind of applied furnish at surface layers, the moisture and adhesive content were considered as variables and their effects on hardness and roughness of manufactured ...
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The feasibility of using of wood and old corrugated container (OCC) fibers on the surface layers of particleboards was investigated. The kind of applied furnish at surface layers, the moisture and adhesive content were considered as variables and their effects on hardness and roughness of manufactured particleboards were examined. The results indicated that the application of both wood fibers and OCC on the surface layers of particleboard resulted in improving surface quality. The moisture and adhesive contents at high levels led to improved surface quality. The control samples with 10% adhesive and 14% moisture content yielded more hardness than the other. The smoothest surfaces appeared on the particleboards manufactured with wood and OCC fibers as well as 14% moisture content and 12% adhesive.
Composite wood products
Behzad Kord
Abstract
In this study, the effect of nanoclay particles content on mechanical properties of wood polymer composite made of high density polyethylene and wood flour were investigated. For this aim, wood flour were compund with high density polyethylene at 50% by weight, and nanoclay with 0, 1, 3 and 5% ...
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In this study, the effect of nanoclay particles content on mechanical properties of wood polymer composite made of high density polyethylene and wood flour were investigated. For this aim, wood flour were compund with high density polyethylene at 50% by weight, and nanoclay with 0, 1, 3 and 5% were used, also 2% of MAHDPE was also used as the coupling agent in all formulatins. Then wood polymer nanocomposite were manufactured in injection molding. Mechanical tests such as tensile, bending and notched impact were performed on samples. Results indicated flextural modulus, flextural strength, tensile modulus tensile strength and were increased by increasing of nanoclay particles content, however, notched impact strength was reduced. Also, studies on structural behavior of wood polymer nanocomposite with x-ray showed that nanoclay distributed as intercalation structure in polymer matrix, and the d-spacing of layers were increased with increasing of nanoclay particles content
Composite wood products
Amir Nourbakhsh; Abolfazl Kargarfard; Fardad Golbabaei
Abstract
The goal of this study was to investigate the use of bagasse fibers as raw material for making laboratory medium density fiberboard (MDF). Effect of treatment (with maleic anhydride and without maleic anhydride) of fibers and the press temperatures (180 ºC , 190 ºC , and 200 ºC) ...
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The goal of this study was to investigate the use of bagasse fibers as raw material for making laboratory medium density fiberboard (MDF). Effect of treatment (with maleic anhydride and without maleic anhydride) of fibers and the press temperatures (180 ºC , 190 ºC , and 200 ºC) on the mechanical and dimensional stability properties of MDF panels were determined. Physical (thickness swelling, water absorption, and swilling in water at ambient temperatures and in steam for 12-216 h.) and mechanical properties (modulus of rupture, modulus of elasticity, and internal bond strength) of the panels were determined according to the procedure of EN standards.This study showed all MDF panels made from bagasse fibers treated with maleic anhydride (MA) at 190 ºC press temperature had the highest values among the other types of specimens for general purpose boards. The thickness swelling and water absorption value with treated bagasse fibers and 190 ºC press temperature were very lower than all MDF panels. Treated bagasse fibers at 190 ºC show a minimum steam absorption. The absorption of steam increase with increase in time from 2 to 120 h in all the six treatments. Beyond 120 h. no additional absorption of steam is found in any of the six MDF boards.
Physics and Mechanical Wood
Morteza Mostafazadeh mrznaki; Saeid kazemi najafi; Majid Chaharmahali; Reza Hajihassani
Abstract
In study, the influence of flour content and immersion time in water on the creep behavior of composites made from mixes PB (Particle Board) and MDF (Medium Density Fiber Board) flour and high density polyethylene (HDPE) waste and was investigated. Mixing was done by a twin screw extruder and the sample ...
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In study, the influence of flour content and immersion time in water on the creep behavior of composites made from mixes PB (Particle Board) and MDF (Medium Density Fiber Board) flour and high density polyethylene (HDPE) waste and was investigated. Mixing was done by a twin screw extruder and the sample was manufactured by flat hot press. Firstly, the modulus of elasticity and bending strength of various mixes PB and MDF flour-polyethylene composites (WPCS) were measured before performing the creep test.It was shown that the modulus of WPCs increases with the increase in mixes PB and MDF flour content from 60% to 70% and then decreases as the flour content reaches to 80%. It is found that the bending strengths of WPCs significantly and linearly decreases with the increase in flour content from 60% to 80%. The results showed that, the creep strain decreases as the lignocellulosic flour level increases. Water absorption has negative effect on creep behavior of mixes PB and MDF flour/HDPE composites. For all filler contents, it can be seen that the creep strain increases when the immersion time increases.
Physics and Mechanical Wood
Morteza Khorami; Ahmad amin Khalili tabas; Amir Nourbakhsh
Abstract
Cement board without fibres has low flexural strength and fails in small strain. To solve this problem and enhance other characteristics, the fibres are applied. Asbestos fibres which have individual properties have been used for reinforcing cement composites since the early 20th century. However in ...
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Cement board without fibres has low flexural strength and fails in small strain. To solve this problem and enhance other characteristics, the fibres are applied. Asbestos fibres which have individual properties have been used for reinforcing cement composites since the early 20th century. However in this decade, most countries have been banned the use of asbestos fibres in construction industries, because of its effect on human healthy. Natural fibres are one of the suitable alternatives for cement board production that have a good compatibility with cement matrix. In this research, to recognize the flexural behaviour which is the one of the most important characteristics for cement board, many laboratory samples have been made by three kinds of fibres and tested. These fibres obtained from agricultural wastes such as bagasse, wheat and eucalyptus. The scanning Electronic Microscopic studies were carried out to clarify the microstructures of composites. The results show that among the all types of fibres, bagasse has the most effect on increasing the flexural strength capacity for cement composite boards.
Composite wood products
Fataneh Azad; Mohammad mehdi Faezipoor; Mehdi Tajvidi
Abstract
In order to investigate the effect of compatibilizer, (MAPP), on physical and mechanical properties of reed stem flour- polypropylene composites, 60 mesh size reed stem flour particles were compounded at 60% and 70% by weight with a polypropylene homopolymer with a melt flow index of 18 g/10min. Two ...
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In order to investigate the effect of compatibilizer, (MAPP), on physical and mechanical properties of reed stem flour- polypropylene composites, 60 mesh size reed stem flour particles were compounded at 60% and 70% by weight with a polypropylene homopolymer with a melt flow index of 18 g/10min. Two compounds were prepared from which formulations with 60 mesh particle size and 60% and 70% filler loading were selected to evaluate the role of the compatibilizer. One of them was without MAPP and the other one had 3% MAPP by weight. Totally, 4 compounds were prepared. Composites were produced using a twin screw counter rotating extruder. Then, mechanical tests including static flexural test, tensile test, Izod impact test and hardness test were carried out. Physical tests including water absorption and thickness swelling were also performed. All testing was in accordance with ASTM D7031-04 specification. The results of physical tests have indicated that by the increase in reed flour content, maximum water absorption and maximum thickness swelling increased. Generally, by adding the coupling agent (MAPP), the physical and mechanical properties significantly improved.
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.
Physics and anatomy
Alireza Ghotibi far; Saeid Kazemi najafi; Rabi Behroz
Abstract
This research focused on the influence of content (5, 10 and 15 %) of glass fiber on the water absorption and thickness swelling of wood flour/E-glass fiber hybrid polypropylene composites without and with MAPP. The samples (strips with 10 mm thickness and 70 mm width) were made using a laboratory twin-screw ...
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This research focused on the influence of content (5, 10 and 15 %) of glass fiber on the water absorption and thickness swelling of wood flour/E-glass fiber hybrid polypropylene composites without and with MAPP. The samples (strips with 10 mm thickness and 70 mm width) were made using a laboratory twin-screw extruder. The water absorption and thickness swelling of the composites after 2h and 24h were determined. The results showed that adding glass fiber significantly increase water absorption and thickness swelling after 2h and 24h in absence of MAPP. Whereas in presence of 2% MAPP by addition glass fiber, no significant changes were observed in water absorption and thickness swelling of the composites after 2h and 24h. MAPP considerably decreased the water absorption and thickness swelling of the studied composites
Composite wood products
Amir Nourbakhsh; Abolfazl Kargarfard; Fardad Golbabaei
Abstract
In this investigation feasibility of Paulownia tomentosa wood in particleboards production were prepared at four different Combination of 100%,75%,50%,and 25%(base of paulownia) , three different press time of 4,5,and 6 minutes.
Based on the EN standards physical and mechanical properties ...
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In this investigation feasibility of Paulownia tomentosa wood in particleboards production were prepared at four different Combination of 100%,75%,50%,and 25%(base of paulownia) , three different press time of 4,5,and 6 minutes.
Based on the EN standards physical and mechanical properties including MOR, MOE, IB, and thickness swelling (after 2 and 24 immersion in water) were tested.
Based on the factorial experimental design at completely random tests were analyses. The results showed that utilization of paulownia wood in particleboard production in 5 minutes and up to 50% paulownia wood particles were optimized.
Composite wood products
Abolfazl Kargarfard; Amir Nourbakhsh; Reza Hajihassani
Abstract
In this investigation, the influence of press temperature and press time on MDF properties made from Eucalyptus wood (Eucalyptus intertexta sp.) have been studied. Variable factors were steaming time (in two levels: 5 and 10 minutes), press temprature (in two levels: 180 and 190 °C ) and press time ...
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In this investigation, the influence of press temperature and press time on MDF properties made from Eucalyptus wood (Eucalyptus intertexta sp.) have been studied. Variable factors were steaming time (in two levels: 5 and 10 minutes), press temprature (in two levels: 180 and 190 °C ) and press time (in three levels: 3, 3.5 and 4 minutes).
The results of this study indicated that the effect of steaming time on MOR had been significant, the highest MOR were obtained 14.62 Mpa in MDF boards that produced in 5 minutes steaming time. Also the MOR of boards were increased with ascending of press temperature. The results also showed that the effect of press temperature on MOE had been significant and MOE of boards were increased with ascending of press temperature.
The results revealed that increasing of steaming time and press time had been negative effect on IB. on the other hand press time had a significant effect on thickness swelling as the minimom of thickness swelling had obtained in 3 minutes press time.
Composite wood products
Ali akbar Ramtin; Alinaghi Karimi; Mehdi Tajvidi
Abstract
In this research, effect of filler and coupling agent on mechanical properties of composites has made from sander dust of particleboard-polypropylene were investigated. The possibility of using high percentage of filler with polypropylene was studied. Three weight percentages of filler namely 40, 55 ...
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In this research, effect of filler and coupling agent on mechanical properties of composites has made from sander dust of particleboard-polypropylene were investigated. The possibility of using high percentage of filler with polypropylene was studied. Three weight percentages of filler namely 40, 55 and 70 percents were chosen. MAPP as coupling agent for increasing quality of adhesion between filler and matrix was used namely 2 percents. Tensile strength, bending strength and toughness were measured. The results showed that with increasing filler, modulus of bending was improved. But tensile stress, tensile modulus, tensile strain, bending stress and toughness was decreased. Also, increasing coupling agent resulted in improving tensile stress, tensile strain, bending stress, modulus of bending and toughness and decreasing tensile modulus.
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
Ali Khalili gasht; Reza Mirza bighi azghandi
Abstract
In this study, for optimum using of agriculture residual and high density spices with a little consumption in the particleboard, the possibility of Haloxylon sp. use of the desert regions’ of Kerman and Bagasse available in the sugar came fields of Khuzestan province was investigated. For ...
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In this study, for optimum using of agriculture residual and high density spices with a little consumption in the particleboard, the possibility of Haloxylon sp. use of the desert regions’ of Kerman and Bagasse available in the sugar came fields of Khuzestan province was investigated. For this purpose of above mentioned raw materials with differente mixture percentage and with change effective agents in uniform particleboard such as particle moisture and press time, samples were made, and then were investigated mechanical and physical properties. For assessing the physical properties such as water absorption and mechanical properties such as rupture modulus, elasticity modulus and internal bonding were used according to the ASTM D-1037 standard. Results of this study showed that with increase amounts of Haloxylon sp. to 40%, rupture modulus and elasticity modulus increased and a great amount cause these strengths decreased. Also with increasing Haloxylon sp. amount to 60%, internal bonding values of boards increased and after this amount internal bonding decreased. With increased Haloxylon to 40%, water absorption in 2 & 24 hours decreased and then increased. Uniform particleboard rupture and elasticity modulus with increasing particle moisture to12% increased and then decreased. The Internal bonding with increasing moisture decreased. Optimum amount of moisture for absorption in 2 & 24 hours was 12%. The best press time for total strength in this study was 6 minutes
Composite wood products
Homayon Solymani; Abolfazl Kargarfard; Amir Nourbakhsh
Abstract
In this investigation, particleboard manufacturing has been offered considering usage of lignocellulosic residues from recision of pomegranate trees in particleboard production using pomegranate and poplar(P.nigra) wood with 4 different combination (1. 100% of pomegranate wood ...
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In this investigation, particleboard manufacturing has been offered considering usage of lignocellulosic residues from recision of pomegranate trees in particleboard production using pomegranate and poplar(P.nigra) wood with 4 different combination (1. 100% of pomegranate wood 2. 75% of pomegranate wood and 25% of poplar wood 3. 50% of pomegranate wood and 50% of poplar wood 4. 100% of poplar wood as the control sample ) and using 2 resin consumption levels UF (10 & 12 %) and 2 press time levels (4&5 min.). According to these factors, 16 combination samples were totally collected and 3 boards from each treatment totally 48 experimental sample boards were made. The result of physical and mechanical properties were analyzed using Randomized Complete Block experimental Design ( RCBD ). The result of this investigation showed that Modulus of Rupture (MOR) in boards has effectively reduced while increasing the press time. On the other hand , resin consumption content and press time have a direct impression on Modulus of Rupture (MOR) and Modulus of Elastisity (MOE) in boards so that MOR and MOE decreased while 10% resin consumption and increasing the press time. These results also indicated that MOR and MOE of the boards have increased by adding poplar particles to the wood combination for board production. Indeed, Internal Bonding (IB) of boards has modified while 10% resin consumption and increasing the press time but IB has effectively decreased by 12% resin consumption and increasing the press time. Anyway, all the Internal Bonding average values for boards have been higher than the standard level. The results also showed that Thickness Swelling (TS) of boards has increased by adding poplar particles to the wood combination for board production.
Composite wood products
Amir Nourbakhsh; Kazem Dosthosseini; Abolfazl Kargarfard; Fardad Golbabaei; Reza Hajihassani
Abstract
This study investigated the effects of production variables on physical and strength properties of air-formed OCC fibers / polymer composites. A combination of 12 treatments of OCC fibers and coupling agents for air-forming were investigated. Physical and mechanical properties of the sample were ...
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This study investigated the effects of production variables on physical and strength properties of air-formed OCC fibers / polymer composites. A combination of 12 treatments of OCC fibers and coupling agents for air-forming were investigated. Physical and mechanical properties of the sample were analyzed using factorial experimental design with completely randomized and DMRT test is used to classified the averages. The results of this study showed that addition of 70% OCC fibers to the polymers in air forming resulted in composites with higher strengths and modulus of rupture and 55% OCC fibers increased internal bonding, tensile strength and modulus, and lowered thickness swelling. Thickness swelling after 2 h water-soak and mechanical properties were improved by addition 2 and 4 % coupling agent
Composite wood products
Hamid reza Adalat; Taghi Tabarsa; Marzyeh Raeisi
Abstract
For this study 10 logs of Paullowina.furtunie from Shastkalateh forest of Gorgan in Iran were selected randomly. After that, 45 clear flat swan specimens prepared and dried to 5% moisture. Density of each log and thickness of specimens were measured. Three levels of compression percent (16%, 33% and ...
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For this study 10 logs of Paullowina.furtunie from Shastkalateh forest of Gorgan in Iran were selected randomly. After that, 45 clear flat swan specimens prepared and dried to 5% moisture. Density of each log and thickness of specimens were measured. Three levels of compression percent (16%, 33% and 50%) and temperature (130°C, 145°C and 160°C) were the variables. The physical properties of specimens such as spring back, compression set and thickness swelling were calculated. Also, MOE, MOR and impact resistance of specimens were evaluated. In order to have accurate examination, microscopic images were taken. Results show that, with increasing in compression percent, the amounts of spring back and thickness swelling enhance. Densification with 16% compression, yields deformation in elastic region while 33% and 50% compression, causes more compression set. The more compression percent, the more mechanical strengths and the highest strength attained in 50% compression. The effect of temperature was insignificant mostly. Finally, the proper treatment for Paullownia densification, was 130°C and 50% compression. Microscopic images asserted the above results and illustrated that, the enhancing of densification above 50% compression is possible.
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
Reza Jazayeri; Habib alah Khademi eslam; Amir Nourbakhsh; Abolfazl Kargarfard
Abstract
In order to survey of possibility of particle board production with «Acacia salicina » the effectiveness of three factor (treatment) included adhesive percentage (in two surface: %9 and %11) temperature degree ( in two surface 1650c and 1750c) pressing time (in three surface: 5/6 and 7 minutes) ...
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In order to survey of possibility of particle board production with «Acacia salicina » the effectiveness of three factor (treatment) included adhesive percentage (in two surface: %9 and %11) temperature degree ( in two surface 1650c and 1750c) pressing time (in three surface: 5/6 and 7 minutes) on mechanical (MOR, MOE, IB) and physical (TS2, TS24) properties were experimented with E.N standard. Therefore 36 boards were prepared for mechanical and physical tests. Data were analyzed with appropriated statistical method. Results indicate %11 adhesive, 1650c temperature degrees and 6 minutes press time is best condition for production. However the results showed more than standard IB (1/24 Mpa ) probably due to its wood chemistry. Therefore this species could be a suitable source to produce particle board
Mechanical conversion of wood and wooden fittings
Abdolah Najafi; Mehdi Faezipoor; Habibalah Khademi eslam; Saeid Kazemi; Amir homan Hamasi
Abstract
In this study flexural properties Wood-plastic composites(WPCs), the composites made from high density polyethylene(virgin, recycled and mix of them) and four types lignocellulosic fillers (wood sawdust, sanding of MDF, particleboard sawdust and rice hull) at %60 by weight fiber loadings were manufactured ...
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In this study flexural properties Wood-plastic composites(WPCs), the composites made from high density polyethylene(virgin, recycled and mix of them) and four types lignocellulosic fillers (wood sawdust, sanding of MDF, particleboard sawdust and rice hull) at %60 by weight fiber loadings were manufactured using a dry blend/hot press method. Nominal density and dimensions of the panels were 1g/cm3 and 35Î35Î1cm, respectively. After conditioning, flexural properties of the panels including flexural modulus and flexural strength were determined. The results show the flexural modulus and strength wood plastic composites containing sanding MDF and particleboard sawdust were higher than those made from other fillers. The flexural modulus and strength were affected by kind of high density polyethylene (virgin or recycled
