Composite wood products
Abbas Tamjidi; Mohamad Mehdi Faezipour; Habibollah Khademi Eslam; Ghanbar Ebrahimi; Kazem DoosthoseinI
Abstract
DOR:98.1000/1735-0913.1398.34.140.66.1.9.1586 In this study, the possibility of three-layered oriented strand board production from hornbeam (Carpinus betulus L.) wood was evaluated. Two levels of press time (6 and 8 minutes) and three levels of press temperature (180˚C, 200˚C and 220˚C) were applied ...
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DOR:98.1000/1735-0913.1398.34.140.66.1.9.1586 In this study, the possibility of three-layered oriented strand board production from hornbeam (Carpinus betulus L.) wood was evaluated. Two levels of press time (6 and 8 minutes) and three levels of press temperature (180˚C, 200˚C and 220˚C) were applied and 12 mm thick laboratory boards were made from hornbeam wood. The strands on the surface layers were aligned in the long direction of the board and the middle layer strands are cross aligned to the surface layers. In all treatments, board targeted density of 0/7 g/cm3 and mat moisture content of 7% and phenol-formaldehyde resin (PF) content of 7% based on the oven dry weight of the strands were kept constant. The mechanical and physical properties of the boards were measured as defined in relevant European standards test methods EN 300. The internal bound (IB) and thickness swelling (TS24) of boards were significantly improved as the press time increased from 6 to 8 minutes. The modulus of rupture (MOR) and internal bound (IB) and thickness swelling (TS24) were significantly improved as the press temperature increased from 180˚C to 220˚C. Overall results showed that the highest MOR and IB and the lowest TS24 were achieved at 8 minutes press time and 220˚C press temperature and all boards made from this mentioned conditions exceed the EN 300 standards for MOR, MOE, IB and TS24.
Composite wood products
Abbas Tamjidi; Mohammad Mehdi Faezipour; Kazem Doosthoseini; Ghanbar Ebrahimi; Habibollah Khademieslam
Abstract
In this study, the effects of mat moisture content and press temperature on physical and mechanical properties of three layered oriented strand boards were evaluated. Two levels of mat moisture content 7% and 10% and three levels of press temperature 180 ˚c , 200 ˚c and 220 ˚c were applied and 12 ...
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In this study, the effects of mat moisture content and press temperature on physical and mechanical properties of three layered oriented strand boards were evaluated. Two levels of mat moisture content 7% and 10% and three levels of press temperature 180 ˚c , 200 ˚c and 220 ˚c were applied and 12 mm in nominal thickness laboratory boards were made from mixture of three clones of ten-year-old hybrid poplar ( populous euramericana vernirubensis, p. e. I-214, P. e. 561/41) while the strands on the surface layers are aligned in the long direction of the board and the middle layer strands are cross aligned to the surface layers. In all treatments, board targeted density of 0/7 g/cm3 and press time of 8 min and phenol-formaldehyde resin (PF) content of 7% based on the oven dry weight of the strands were held constant. The mechanical and physical properties of the boards were measured as defined in relevant European standards EN 300 for OSB/1 and OSB/2. Overall results showed that all boards made from above mentioned conditions exceed the EN 300 standards for MOR, MOE, IB and TS24. The bending properties (MOR and MOE) of boards were significantly improved as the mat moisture content increased from 7 to 10%. The highest MOR was achieved at 10% mat moisture content and 220 ˚c press temperature and the highest MOE was achieved at 10% mat moisture content and 180 ˚c press temperature. The Modulus of Rupture (MOR) and Thickness swelling (TS24) were significantly improved as the press temperature increased from 180 ˚c to 220 ˚c. The lowest TS24 was achieved at 7% mat moisture content and 220 ˚c press temperature and the highest IB was achieved at 7% mat moisture content and 200 ˚c press temperature.
Composite wood products
Abolfazl Kargarfard; Amir Nourbakhsh
Abstract
AbstractThe objective of the present study was the utilization of cotton stalk residues for medium density fiberboard production. MDF was produced applying Three press temperatures (170, 180, and 190 oC ) and three pressing times (3,4 and 5 minutes) were used to produce medium density fiberboard (MDF) ...
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AbstractThe objective of the present study was the utilization of cotton stalk residues for medium density fiberboard production. MDF was produced applying Three press temperatures (170, 180, and 190 oC ) and three pressing times (3,4 and 5 minutes) were used to produce medium density fiberboard (MDF) from cotton stalks fibers. The properties of the laboratory boards were measured and the results are analyzed applying factorial experiment and randomized design. In case, the statistical difference was observed between the averages, then Duncan Multiple Range Test was used for grouping the averages. The results showed that as either press temperature or press time is increased, the modulus of rupture of the of the boards was significantly improved and the highest value was reached when 190 oC press temperature and 5 minutes press time was applied. The internal bonding of the boards was significantly higher when 180 oC press temperature was applied. The effect of press temperature on thickness swelling after 2 and 24 hours immersion in water was statistically significant and the lowest values were obtained when 190 oC press temperature was used. The results of this study indicated that the cotton stalks can be considered as a potential raw material for medium density fiberboard production and the properties of the boards meets the EN requirements.
Ghoncheh Rassam; Masoud Azadifar; Abolfazl Karegarfard; Faezeh Fazeli
Abstract
The purpose of this study was to examine the physical and mechanical properties of particleboard made using corn stalk. Mixtures of corn stalks and industrial wood particles at the ratios of 0:100, 30:70, 50:50, 70:30, urea-melamine formaldehyde resin at two levels of 10 and 12% (based on the dry weight ...
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The purpose of this study was to examine the physical and mechanical properties of particleboard made using corn stalk. Mixtures of corn stalks and industrial wood particles at the ratios of 0:100, 30:70, 50:50, 70:30, urea-melamine formaldehyde resin at two levels of 10 and 12% (based on the dry weight of the particles) and two press times of 5 and 6 minutes were used for the production of laboratory particleboard. Physical and mechanical properties including water absorption and thickness swelling after 24 hours soaking in water, modulus of rupture, modulus of elasticity and internal bonding were measured and the data were statistically analyzed. It was observed that the increase in corn stalk particles in the mixture resulted in reduction of water absorption, thickness swelling after 24- hours water soaking and the internal bonding. The modulus of rupture and elasticity of the boards were increased at higher ration of corn stalk particles. The higher dosage of resin and higher press time imposed significant effect on all properties boards and improving properties were reached. In general, comparing the produced boards properties with EN 312 requirements, the boards produced using 70% corn stalk particles, 12% urea-melamine formaldehyde and 6 minutes press time showed optimal properties.
ُSima Sepahvand; Saeid Ziaee Khosro Shahi; Tagi Tabarsa
Abstract
This study provides an investigation of particleboard manufacture using tannin-ureaformaldehyde adhesive. Test board samples were made with regard to various replacementpercentage of tannin–urea (levels of 0, 10, 20 and 30%) and press time (12 and 15 min) andtheir properties were determined. Achieved ...
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This study provides an investigation of particleboard manufacture using tannin-ureaformaldehyde adhesive. Test board samples were made with regard to various replacementpercentage of tannin–urea (levels of 0, 10, 20 and 30%) and press time (12 and 15 min) andtheir properties were determined. Achieved data were analyzed according to two sides factorialplan. The results showed that with replacement of 10% urea formaldehyde adhesive by tanninformaldehydeat both 12 and 15 min pressing times, thickness swelling (after 2 and 24 hoursimmersion in water) was decreased while internal bonding increased. There were no significanteffect on MOR and MOE values. In general, the results of present research showed thatreplacing the UF resin at lower levels of tannin is suitable as adhesive to manufactureparticleboard so that with replacement ratio of 90:10, the moisture properties of boards werevery close to permissible those of the exterior wood uses.
Abolfazl Karegarfard
Abstract
The objective of this investigation was the utilization of corn stalk in Medium Density Fiberboard (MDF) production. Therefore 27 laboratory MDF boards were produced using three press temperatures of 165, 175 and 185 °C and three press duration of 3, 3.5 and 4 minutes. The mechanical and physical ...
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The objective of this investigation was the utilization of corn stalk in Medium Density Fiberboard (MDF) production. Therefore 27 laboratory MDF boards were produced using three press temperatures of 165, 175 and 185 °C and three press duration of 3, 3.5 and 4 minutes. The mechanical and physical properties of the boards were measured and the results were statistically analyzed. The results indicated that press temperatures and press duration did not impose significant effect on MOR, but with increasing the press temperature and press duration, the MOE of the boards improved and the highest MOE was observed applying 185 °C press temperatures and 4 minutes press duration. The internal bonding (IB) of boards increased with increasing press duration, and the highest IB was related to boards produced with 3.5 and 4 minutes press duration. The press duration significantly influenced the thickness swelling after 2 and 24 hours immersion in water, and the lowest values were observed in boards produced applying 3.5 minutes press duration, as expected from the results of highest IB at same condition. Generally it can be expressed that corn stalk shows the potential as raw material to produce standard Medium Density Fiberboard.
Ahmad reza Zahedi tabarstani; Ahmad Jahan Latibari; masoudreza habibi
Abstract
Licorice root residue, a non wood lignocelullosic raw material produced following extraction process was investigated for medium density fiberboard production. MDF was produced utilizing fiber generated applying three steaming times (15, 20 and 25 minutes) at 170 °C steam temperature. ...
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Licorice root residue, a non wood lignocelullosic raw material produced following extraction process was investigated for medium density fiberboard production. MDF was produced utilizing fiber generated applying three steaming times (15, 20 and 25 minutes) at 170 °C steam temperature. The fibers were blended with 10 or 12 % urea formaldehyde resin and then the fiber mats were pressed for either 5, 6 and 7 minutes. Eighteen combinations of variables were obtained and for each combination, three boards and a total of 54 were produced. The anatomical characteristics of the roots and physical and mechanical properties of MDF including bending strength and modulus of elasticity, internal bonding and thickness swelling after 2 and 24 hours immersion in water were measured. The results revealed that the average fiber length and diameter of the root fibers were 1.02 mm and 11.63 µm respectively. The maximum bending strength , modulus of elasticity, internal bonding of the boards produced using fibers generated after 20 minutes steaming time, 7 minutes pressing and 10% resin were measured as 5.291 MPa. 559.4 MPa. and 0.1245 MPa., respectively. The minimum thickness swelling after 2 and 24 hours immersion in water of the above mentioned boards were 31.6% and 34.12% respectively. The results indicated that the fiber produced from licorice root can be used as a partial substitute in MDF production.
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.
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 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
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
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
Amir Nourbakhsh; Abdolrahman Hosseinzadeh; Kazem Doosthosseini; Abolfazl Kargarfard; Mazyar Radkyan
Abstract
In this investigation feasibility of Beech slabs in particleboards production were prepared at three different contents resin of 9, 10, and 11 percent, press temperatures of 165°C and 175°C and hardener contents of 1.5 and 2.5 percent.Based on the DIN-68763 standard physical and mechanical properties ...
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In this investigation feasibility of Beech slabs in particleboards production were prepared at three different contents resin of 9, 10, and 11 percent, press temperatures of 165°C and 175°C and hardener contents of 1.5 and 2.5 percent.Based on the DIN-68763 standard physical and mechanical properties including MOR, MOE, IB, and thickness swelling (after 2 and 24 immersion in water) were tested.According to the factorial experimental design at completely random test was analysis. The potential utilization of Beech slabs residues in particleboard production including: resin content (11%), press time (6 min.), press temp. (175°C), and hardener contents (2.5%) were found.
Composite wood products
masoudreza habibi; Abdolrahman Hosseinzadeh; Hossein Hosseinkhani; Saeed Mahdavi
Abstract
In this study the effect of two variables, (resin content and press time) on properties of MDF was investigated. Levels of each variable was as follow: Resin content (8, 9.5, 11 percent) Press time (4, 5, 6 minutes). The statistical analysis proved that the effect of press time on MOE and MOR was significant. ...
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In this study the effect of two variables, (resin content and press time) on properties of MDF was investigated. Levels of each variable was as follow: Resin content (8, 9.5, 11 percent) Press time (4, 5, 6 minutes). The statistical analysis proved that the effect of press time on MOE and MOR was significant. MOE and MOR were the highest at press time of 6 minutes. According to Duncan's test, there aren’t any significant differences between MOE at press time of 5 and 6 minutes. Also the effect of resin content on MOE had significant differences. MOE was the highest at resin content of 11%. There aren’t any significant differences between MOE on resin content at 9.5% and 11% levels. The results showed that effects of press time and resin content had significant differences on IB. IB was the highest at press time of 6 minutes and resin content of 11%. There aren’t any significant differences between IB on resin content at 9.5% and 11%. The effects of press time and resin content had significant differences on thickness swelling after 2 hours. Thickness swelling was the lowest at press time of 6 minutes and resin content of 11%. According to the results of this study optimum combination for MDF production from baggasse includes resin content and press time of 9.5% and 5 minutes respectively.
Composite wood products
Amir Nourbakhsh; Abdolrahman Hosseinzadeh; Ahmad Jahan latibari; Fardad Golbabaei; Abolfazl Kargarfard; Hossein Hosseinkhani
Abstract
In this experiment the optimum condition of particleboard uom Date palm residues and prosopis (Mesquite) produced in southern part of Iran was investigated. Variable factors as type of raw-material (Date palm and prosopis), resin content (9, 10 and 11 percent) and press time (5, 6 and 7 minutes) and ...
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In this experiment the optimum condition of particleboard uom Date palm residues and prosopis (Mesquite) produced in southern part of Iran was investigated. Variable factors as type of raw-material (Date palm and prosopis), resin content (9, 10 and 11 percent) and press time (5, 6 and 7 minutes) and total of 18 combinations of variables were investigated.Other factors such as type of resin (UF), hardner content (2 percent) type of hardner (NH4CI)press closing time (4.5 mm/sec.), board density (0.7gr/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 blocks test was used. The results of this study could be summarized as follows: Increasing the resin content from 9 to 11 percent increased MOR, MOE and ID and decreased thickness swelling after two and 24 hours immersion in water.The highest internal bond (IB) was related to prosopis (Mesquite) boards made at 5 minute, prass time. As far as production of date plam and prosopis (Mesquite) wood is concerned, the results revealed that the polymerization of resin and wood is better at 11 percent resin content and 5 minutes of press time. Date palm residues are important with treatment process according to reference. NO. One. Shape and dimension of chipped and flaked particles of date palm residues are important, because type and characteristics of species are different, in the mean time, as date palm residues has very high bulk density and specific surfaces than prosopis (Mesquite) which it has inverse effect on both physical and mechanical properties, thus it should be considered during the process of particleboards production.
