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.
Amir Eshraghi; Habib alah Khademeslami; Amir Nourbakhsh; Behzad Bazyar; Mohammad Talaeipoor
Abstract
In this study, aspen chips with OCC (Old Corrugated Container) were used in particleboard production and samples were prepared at two different levels of resin contents (%9 and %10) and three levels of combination:
1- %25 OCC +%75 aspen, 2- %50 OCC + %50 aspen, ...
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In this study, aspen chips with OCC (Old Corrugated Container) were used in particleboard production and samples were prepared at two different levels of resin contents (%9 and %10) and three levels of combination:
1- %25 OCC +%75 aspen, 2- %50 OCC + %50 aspen, 3- %75 OCC +%25 aspen. Indeed in this study these two mentioned factors are variable and other factors such as press temperature: 165 ºC, press time: 5 minute, mat moisture %12, board density 0.75 g/cm3 and press pressure 30 kg/cm2 were constant. After the boards were manufactured according to DIN-68763 standard, were undergone different tests such as: bending strength, modulus of elasticity, internal bonding strength and thickness swelling after 2 & 24 hours immersion in water. The results indicate that second ratio(%50 OCC and %50 aspen chips) is proper for bending applications and the first ratio(%25 OCC and %75 aspen chips) is proper for tensile and thickness swelling applications. Therefore, applying the OCC more than %50 in manufacturing combination; result in decreasing the physical and mechanical properties. Moreover the results show that when the resin content increases, the board features improve.
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.
Management and Economics wood
Hamideh Abdolzadeh; Kazem Doost hosseini
Abstract
The capability of acetylated poplar particles with isocyanate resinin manufacturing particleboard was investigated. The acetylation degrees at high, medium, and zero (control) levels and type of resin (isocyanate and urea formaldehyde) were considered as variables. Then the effects of these variables ...
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The capability of acetylated poplar particles with isocyanate resinin manufacturing particleboard was investigated. The acetylation degrees at high, medium, and zero (control) levels and type of resin (isocyanate and urea formaldehyde) were considered as variables. Then the effects of these variables on practical properties of manufactured boards were investigated. The results indicated that use of isocyanate resin in board with acetylated particles not only caused to improve dimensional stability of manufactured boards but also caused to increase its mechanical Strength in comparison with blank with urea formaldehyde resin. Increasing acetylation degree caused to decrease the studied boards of the mechanical properties and enhance their dimensional stability. Although on board with isocyanate resin, increasing dimensional stability in comparison with blank is the highest. Particleboards with isocyanate resin indicated less water absorption and thickness swelling in comparison with blanks with urea formaldehyde resin after immersing in water for 2 and 24 hours.
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
Abolfazl Kargarfard; Kazem Doost hosseini; Amir Nourbakhsh
Abstract
The application of regressions models for pridicting physical and mechanical properties of laboratory produced particleboard was studies. In order to study the influence of mat moisture content gradient, particle geometry, press time and temperature, 108 boards were produced.
Regressions model indicated ...
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The application of regressions models for pridicting physical and mechanical properties of laboratory produced particleboard was studies. In order to study the influence of mat moisture content gradient, particle geometry, press time and temperature, 108 boards were produced.
Regressions model indicated that particle geometry significantly influenced board MOR, increasing the slender ratio of particles, improved MOR. Regressions models of MOE indicated that both particle geometry and mat moisture content gradient significantly influenced board MOE, and increasing the slender ratio of particles and mat moisture content gradient, increased MOE. regression model of IB indicated that all of the variables have significantly affected IB. However, in this case, increasing mat moisture content gradient, particle geometry reduced IB and press time and temperature increased IB, moisture content gradient and particle geometry had more effective.
The results indicated that moisture content gradient and press time significantly influenced the regression model of thickness swelling after 24 hours soaking in cold water.
Composite wood products
Ali Akrami; Kazem ِDossthoseini; Ahmad Jahan latibari; Mohammad mehdi Faezipoor
Abstract
In this investigation, the effect of paraffin content and press time and temperature on practical properties especially surface roughness of particleboard is studied. The variables such as paraffin content at 0, 1& 2 percent, press temperature at 170° and 180° C and press time of 4 and 5 ...
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In this investigation, the effect of paraffin content and press time and temperature on practical properties especially surface roughness of particleboard is studied. The variables such as paraffin content at 0, 1& 2 percent, press temperature at 170° and 180° C and press time of 4 and 5 minutes were investigated.
Modulus of rupture, modulus of elasticity, shear strength, water absorption and thickness swelling after 2& 24 hours soaking in water & surface roughness were measured.
The results indicate that there is no significant difference on the influence of paraffin content on either MOR & MOE of the particleboard. But increasing paraffin content decreased shear strength of panels.
However, addition of paraffin reduced water absorption and thickness swelling.
Press temperature had no significant influence on measured properties, but this variables increased surface roughness. Increasing press time, improved MOE, but showed no significant influence on other properties.
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.
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 ...
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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.
Composite wood products
Majid Chahar mahal; Saeid Kazemi najafi; Mehdi Tajvidi; Reza Hajihassani
Abstract
Wood -Plastic panels were made from high density polyethylene (as resin) and MDF waste and particleboard waste (as natural fiber) at 60, 70 and 80% by weight fiber loading. Density and dimensions of the panels were 1g/cm3and 35*35*1 cm, respectively. Physical properties of the panels including equilibrium ...
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Wood -Plastic panels were made from high density polyethylene (as resin) and MDF waste and particleboard waste (as natural fiber) at 60, 70 and 80% by weight fiber loading. Density and dimensions of the panels were 1g/cm3and 35*35*1 cm, respectively. Physical properties of the panels including equilibrium moisture content, long term water uptake and thickness swelling behavior were studied.Results indicated that equilibrium moisture content, maximum water uptake and thickness swelling of wood plastic samples increased with the increase in fiber content from 60% to 80%. Moreover, samples with higher fiber content faster reach to saturation point.
Composite wood products
Majid Chaharmahali; Saeid Kazeminajafi; Mehdi Tajvidi; Mohammad ali Podineh poor
Abstract
The possibility of producing wood-plastic panels using melt blend method was studied in this research and mechanical properties of the panels including flexural modulus, flexural strength, screw and nail withdrawal resistance, and impact strength were studied.Wood -Plastic panels were made from high ...
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The possibility of producing wood-plastic panels using melt blend method was studied in this research and mechanical properties of the panels including flexural modulus, flexural strength, screw and nail withdrawal resistance, and impact strength were studied.Wood -Plastic panels were made from high density polyethylene (as resin) and MDF waste and particleboard waste (as natural fiber) at 60, 70 and 80% by weight fiber loading. Density and dimensions of the panels were 1g/cm3and 35*35*1 cm, respectively. Results indicated that the mechanical properties of the composites are strongly affected by the proportion of the wood flour and polymer in the material. Maximum values of flexural modulus of wood plastic panels were found at 70% fiber content in both methods. Flexural strength, screw and nail withdrawal resistance and impact strength of wood plastic composites reduced with the increase in fiber content from 60% to 80%.
Composite wood products
Majid Chaharmahali; Saeid Kazemi najafi; Mehdi Tajvidi
Abstract
The possibility of producing wood-plastic panels using two methods including melt blend and dry blend was studied in this research. Methods were compared with each other in order to select the best. Wood-Plastic panels were made from high density polyethylene (as resin) and particle board waste (as natural ...
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The possibility of producing wood-plastic panels using two methods including melt blend and dry blend was studied in this research. Methods were compared with each other in order to select the best. Wood-Plastic panels were made from high density polyethylene (as resin) and particle board waste (as natural fiber) at 60, 70 and 80% by weight fiber loading. Density and dimensions of the panels were lg/cm3 and 35*35*1 cm, respectively. Mechanical properties of the panels including flexural modulus, flexural strength, screw and nail withdrawal resistance, and impact strength were under investigation. Maximum values of flexural modulus of wood plastic panels were found at 70% fiber content in both methods. Flexural strength, screw and nail withdrawal resistance and impact strength of wood plastic composites reduced with the increase in fiber content from this is not a reduction 60% to 80% is increase. Mechanical properties of samples made with dry blend method were generally higher than those of samples made with melt blend method for an corresponding formulations.
Composite wood products
Amir Nourbakhsh; Abolfazl Kargarfard
Abstract
In this study the effect of resin content and press time of particleboard from Date palm residues, Eucalyptus camaldulensis, Tamarix residues and prosopis (Mesquite) producted were investigated in southern of Iran.Variable factors as resin content (9, 10 and 11 percent) and press time (5, 6 and 7 minutes) ...
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In this study the effect of resin content and press time of particleboard from Date palm residues, Eucalyptus camaldulensis, Tamarix residues and prosopis (Mesquite) producted were investigated in southern of Iran.Variable factors as resin content (9, 10 and 11 percent) and press time (5, 6 and 7 minutes) and total of 27 boards were fabricated. Other factors such as type of resin (UF), hardener content (2 percent) type of hardener (NH4Cl) press closing time (4.5 mm/sec.), board density (0.7 gr/cm3) press pressure (30 kg/cm2) and press temperature (160 °C)were held constant.All boards were tested according to DIN-68763 standard. The factorial experimental design at completely random test was used. The results of this study could be summarized as follows:Increasing the resin content from 9 to 11 percent, MOE and IE and decreased thickness swelling after two and 24 hours immersion in water. The results revealed that the polymerization of resin and wood is better at 11 percentresincontentand6 minutes of press time.
Composite wood products
Abolfazl Kargarfard; Abdolrahman Hosseinzadeh; Kazem Doosthosseini; Ahmad Jahan latibari; Amir Nourbakhsh
Abstract
In this investigation, experimental boards were produced using beech wood particle, mat moisture content gradient at 0,3 and 6%, two press temperature sat 165and 1850 C and two press times at 3 and 5 minutes. 36 sample boards produced and the physical and mechanical properties of those tested.The results ...
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In this investigation, experimental boards were produced using beech wood particle, mat moisture content gradient at 0,3 and 6%, two press temperature sat 165and 1850 C and two press times at 3 and 5 minutes. 36 sample boards produced and the physical and mechanical properties of those tested.The results indicated that mat moisture content gradient had significantly effected on modified of modulus of elasticity of boards, and with increasing mat moisture content gradient, the MOE of boards increased. Also in 0% mat moisture content gradient, increasing of press time, modulus of rupture and modulus of elasticity decreased. However with increasing mat moisture content gradient, increasing of press time caused of these properties modified.On the other hand an inverse relationship observed between mat moisture content gradient and internal bond of boards that due to of negative effect of increasing of vapor pressure were on resin bond quality in middle layer. But with increasing press time from 3 to 5 minutes, the internal bond of boards increased. The results of thickness swelling measurement indicated that with increasing mat moisture content gradient, the thickness swelling of boards increased. However, when press time increased, the thickness swelling of boards decreased.
Pulp and paper
asghar tarmian; Kazem Doosthosseini; Seeyed Ahmad Mirshokraie; Mohammadmehdi Faezi poor
Abstract
Beneficial utilization of large quantity of paper sludge from Mazandaran Wood & Paper Industry in particleboard manufacturing has been studied. Single-layer and three-layer particleboard (paper sludge as a surface layer) were produced. Urea-formaldehyde resin at two levels of 10 and 12 percent and ...
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Beneficial utilization of large quantity of paper sludge from Mazandaran Wood & Paper Industry in particleboard manufacturing has been studied. Single-layer and three-layer particleboard (paper sludge as a surface layer) were produced. Urea-formaldehyde resin at two levels of 10 and 12 percent and paper sludge content at 4 levels, 0, 15, 30 and 45 percent were studied. Other factors such as press temperature (160oC), press time (6minutes), mat moisture (12%), board density (0.75g/cm3) and etc were constant factors. Mechanical and physical properties including bending strength, shear strength, thickness swelling and water absorption after 2 and 24 hours immersion were evaluated. The results indicated that application of paper sludge reduced mechanical properties and improved thickness swelling .The particleboard produced with 15%paper sludge had the least water absorption, but by using more paper sludge, water absorption increased. Single-layer particleboard had higher bending strength. However, there was no significant different in shear strength between single and three layer particleboard. Three-layer particleboard showed lower thickness swelling.
Composite wood products
Abolfazl Kargarfard; Amir Nourbakhsh
Abstract
The purpose of this study was to examine the utilization of grape lignocellulosic pruning as a raw material in particleboard manufacturing. Experimental boards were produced with using grape wood particles, resin content (UF resin) at 10 and 12% and press time at 5 and 6 minutes. 18 samples boards were ...
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The purpose of this study was to examine the utilization of grape lignocellulosic pruning as a raw material in particleboard manufacturing. Experimental boards were produced with using grape wood particles, resin content (UF resin) at 10 and 12% and press time at 5 and 6 minutes. 18 samples boards were produced and tested.The modulus of rupture (MOR) and modulus of elasticity (MOE) of all boards modified significantly with increasing resin content. However MOR and MOE increased with increasing press time; but MOR and MOE of boards at 5 and 6 minutes of press time had not significantly different.The results of this study showed that resin content and press time had a linear relationship with internal bonding (IB) of boards. The highest IB amount achieved under condition of resin content at 12% and press time at 6 minutes. Nevertheless IB of all boards were higher than DIN standard .The suitable IB of boards caused that thickness swelling (T.S) of boards after 2 and 24 hours soaking in water were as good as standard level. However the minimum T.S of boards observed in boards with 12% resin content.The results of this study showed that grape pruning residues can be utilized as a suitable lignocellulosic raw material in particleboard industries. Also in order to achieve better mechanical and mechanical properties of boards, using poplar wood with grape residues special with 10% resin cotent consumption could be recommende
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.
Abolfazl Kargarfard; Abdolrahman Hosseinzadeh; Amir Nourbakhsh; Fardad Golbabaei; Reza Hajihassani
Abstract
In order to investigate the influence of processing variables such as particle drying temperature, press temperature and hardner consumption on wood acidity and bonding performance of UF resin, experimental boards were produced using beech wood particle, drying temperature varied at 80, 110 and 140°C, ...
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In order to investigate the influence of processing variables such as particle drying temperature, press temperature and hardner consumption on wood acidity and bonding performance of UF resin, experimental boards were produced using beech wood particle, drying temperature varied at 80, 110 and 140°C, press temperature at 150, 165 and 180°C and hardner consumption at 1, 1.5 and 2% (based on solid content of UP resin). Eighty one sample boards were produced and tested. The results of physical and mechanical properties measurements were as follows: Modulus of rupture and modulus of elasticity of boards produced with particles dried at 80°C were higher than 110 and 140°C. Application of 2% hardener with increasing press temperature decreased MOR and MOE. Internal bonding of boards were measured and the results indicated that drying temperature had significantly effected the IB and boards produced with particles dried at 80 and 140°C, produced highest IE and lowest IE was belong to 110°C. The effect of hardner consumption was statistically significant and the highest IB was belonging to 2% hardner consumption. The results of thickness swelling measurement after 2 hr. soaking in water indicated that T.S2 of boards produced with particles dried at 140°C were the lowest. The combined effect of press temperature and hardner consumption on T.S2 was statistically significant and at 2% hardner consumption with increasing press temperature, increased thickness swelling.
Composite wood products
Abdolrahman Hosseinzadeh; Amir Nourbakhsh; Fardad Golbabaei; Abolfazl Kargarfard; Homayon Solimani ashtiani
Abstract
In order to manufacture particleboard from various populus clones species grown in four years short - rotation, eighteen clones from different species of populus grown in "Alborz Research Center" with a control sample of Beech from Caspian Forests totally 19 combination spicement were collected and 3 ...
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In order to manufacture particleboard from various populus clones species grown in four years short - rotation, eighteen clones from different species of populus grown in "Alborz Research Center" with a control sample of Beech from Caspian Forests totally 19 combination spicement were collected and 3 boards from each treatment totally 57 experimental sample boards were produced.The effects of different species and clones of populus on physical and mechanical properties of boards were studied. The results showed that clones P.d 77.51 and P.e.561.41 grown four years had the maximum modulus of repture (MaR). The P.e. 561.41, P.e. vernirubensis showed a high modulus of elasticity (MOE), and internal bonding (IB) was the maximum in P.d. 44.9, P.n. 63.135. The minimum amount of thickness swelling after 2 hours - immersion were belong to P.d. 77.51, P.n. 42.78 and the thickness swelling after 24 hours immersion were belong to P.n. 63.135 , P.e. 42.78. respectively.It has been shown that most of the different populous clones grown four years - rotation, have the higher applicable properties than control sample for particleboard.The results of this study showed that it is possible to use 4-years-old wood of P.e. 561.41, P.d. 77.51, P.e vernirubensis, P.n. 63.135, P.e. 44.9 woods for particleboard manufacture.
Composite wood products
Hossein Hosseinkhani; Abdolrahman Hosseinzadeh; Fardad Golbabaei; Amir Nourbakhsh; Nayeralsadat Sadraei; masoudreza Habibi
Abstract
In this study, the effect of board type, press time and resin content on the strength of particleboard have been evaluated. The boards made for this study contained bagasse and logging residues of Eucalyptus wood particles at a 50 to 50 ratio and employed Urea formaldehyde (UF) resin as the binder. Variable ...
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In this study, the effect of board type, press time and resin content on the strength of particleboard have been evaluated. The boards made for this study contained bagasse and logging residues of Eucalyptus wood particles at a 50 to 50 ratio and employed Urea formaldehyde (UF) resin as the binder. Variable factors are as follows:- type of board; single layer, three layer- press time; 5 , 6 , 7 , minutes- resin content; 9 , 10 , 11 percentThree boards' were manufactured for each combination of variables. Samples of all the boards made were tested by the methods described in DIN 68763 standard to obtain mean values of bending strength, and internal bond strength (LB). In addition samples of each type of board were tested for thickness swelling after immersion in water for 2 hours and 24 hours respectively.The results of this study show clearly that three layer particleboard has significantly higher bending strength than single layer, but single layer boards have better properties from the physical aspect.
Increasing the content of U.F resin from 9 per cent to 10 per cent was found to reduce the thickness swelling, and tended to improve the strength properties of the board, in both single layer and three layer boards. Press time has significant effect on bending strength and I.B Highest MOR and MOE were observed on three layer board pressed for 7 minutes.
