Mechanical and physical properties of medium density fiberboard panels laminated with thermally compressed veneer

Summary The objective of this study was to determine the effect of five different silvicultural strategies and wood type on mechanical and physical properties of loblolly pine (Pinus taeda L.) particleboard and fiberboard. The furnish was prepared in an unconventional manner from innerwood and outerwood veneer for each stand. Modulus of rupture (MOR) differences between the stands were insignificant for particleboard. Some significant modulus of elastisity (MOE) differences existed between the stands for particleboard and fiberboard. Differences between the wood types were minimal for each stand. Innerwood yielded higher mean MOR, MOE, and internal bond (IB) values than outerwood for most of the stands. The differences between the stand and wood types for 2 and 24 h thickness swell and 2 and 24h water adsorption were very minimal. This research has shown that innerwood can produce particleboard and fiberboard panels with very comparable mechanical and physical properties to outerwood. The effect of the silvicultural strategy (i. e., stand) was minimal for most properties.

Download Full-text

Impact of log position in the tree on mechanical and physical properties of black spruce medium-density fibreboard panels

Canadian Journal of Forest Research ◽

10.1139/x06-268 ◽

2007 ◽

Vol 37 (5) ◽

pp. 866-873 ◽

Cited By ~ 3

Author(s):

Jun Li Shi ◽

Bernard Riedl ◽

James Deng ◽

Alain Cloutier ◽

S. Y. Zhang

Keyword(s):

Physical Properties ◽

Water Absorption ◽

Black Spruce ◽

Analysis Of Covariance ◽

Modulus Of Rupture ◽

Medium Density ◽

Medium Density Fibreboard ◽

Significant Difference ◽

Mechanical And Physical Properties ◽

The Impact

Mechanical and physical properties of medium-density fibreboard (MDF) panels made from black spruce ( Picea mariana (Mill.) BSP) top, middle, and butt logs were studied. The analysis of variance and analysis of covariance were both performed to examine the impact of log position in the tree on panel modulus of rupture (MOR), modulus of elasticity (MOE), internal bond (IB), linear expansion (LE), thickness swell (TS), and water absorption. Results indicate that MOE and IB strength of MDF panels made from top and middle logs were significantly superior to those of panels made from butt logs; however, there was no significant difference in MOE and IB between panels made from top and middle logs. Water absorptions of top and middle log panels were significantly lower than that of panels made from butt logs, and the difference in water absorption between panels made from top and middle logs was not significant. TS of top log panels was the smallest among the panels from the three log positions in the tree and was significantly different from those of middle and butt log panels. TS of butt log panels was the highest, which was significantly different from that of top and middle log panels. The differences in LE among the panels made from top, middle, and butt logs were not significant. The comparison of MOR of top, middle, and butt log panels was dependent on panel density because of the interactions among the three groups. Top and middle log panels showed superior properties, because the thinner cell walls of fibres from top and middle logs resulted in an increased compaction ratio compared with the butt log panels. Panel density affected both panel MOR and MOE considerably; however, its impact on IB, LE, TS, and water absorption was not significant in this study. The equations describing the linear relationships between MOR, MOE, and panel density were developed.

Download Full-text

MECHANICAL AND PHYSICAL PROPERTIES OF MEDIUM DENSITY FIBREBOARD WITH CALCITE ADDITIVE

Wood Research ◽

10.37763/wr.1336-4561/65.2.231244 ◽

2020 ◽

Vol 65 (2) ◽

pp. 231-244

Author(s):

Osman Camlibel ◽

Mehmet Akgul

Keyword(s):

Physical Properties ◽

Medium Density ◽

Medium Density Fibreboard ◽

Mechanical And Physical Properties

Download Full-text

Effect of Iron Oxide Nanoparticles on the Physical Properties of Medium Density Fiberboard

Polymers ◽

10.3390/polym12122911 ◽

2020 ◽

Vol 12 (12) ◽

pp. 2911 ◽

Cited By ~ 2

Author(s):

Waheed Gul ◽

Hussein Alrobei ◽

Syed Riaz Akbar Shah ◽

Afzal Khan

Keyword(s):

Iron Oxide ◽

Physical Properties ◽

Iron Oxide Nanoparticles ◽

Urea Formaldehyde ◽

Medium Density Fiberboard ◽

Oxide Nanoparticles ◽

Medium Density ◽

Fe2o3 Nanoparticles ◽

Thickness Swelling ◽

Composite Samples

This paper investigates the influence of iron oxide (Fe2O3) nanoparticles on the physical properties of medium density fiberboard (MDF). In this study, three different nano iron oxide loadings, i.e., 0.5, 1.5 and 2.5 wt %, and untreated poplar fibers were used. The iron oxide (Fe2O3) nanoparticles were initially dispersed into urea formaldehyde resin using a high-vacuum mechanical stirrer before being incorporated into natural fibers. The untreated poplar fibers were wound onto metal frames to produce dry mat layers. Twenty different composite samples were made. All composite samples were tested for physical properties, i.e., thickness swelling, water absorption, moisture content and density in accordance with standards EN-317, ASTM D570, EN-322 and EN-323 respectively. Based on the results, it was found that the incorporation of homogeneously dispersed iron oxide nanoparticles significantly improved thickness swelling (Ts). Moreover, water absorption (WA) improved by up to 49.18 and 34.54%, respectively, at the highest loading of 2.5 wt %. Microstructure was investigated and characterized with scanning electron microscopy (SEM), x-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) and we examined whether iron oxide nanoparticles exhibit good interactions with urea formaldehyde and poplar wood fibers. Heat and mass transfer investigation in the form of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) was carried out due to the impact of Fe2O3 nanoparticles. The curing temperature and thermal stability of the resin were enhanced due to the addition of Fe2O3 nanoparticles. A one-way ANOVA statistical analysis was established to effectively control the use of Fe2O3 nanoparticles. Therefore, the presence of iron oxide nanoparticles in an epoxy polymer contributes to a stiffer matrix that, effectively, enhances the capability of improving the physical properties of nano MDF.

Download Full-text

Mechanical and Physical Properties of Particle Board Made from Silaned and NaOH Modified Kelampayan (Neolamarckia cadamba) Particles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.812.169 ◽

2013 ◽

Vol 812 ◽

pp. 169-174

Author(s):

Azizul Ishak ◽

Siti Rafedah A. Karim ◽

Hashim W. Samsi

Keyword(s):

Physical Properties ◽

Dimensional Stability ◽

Internal Bond ◽

Bending Strength ◽

Treated Wood ◽

Raw Material ◽

Medium Density ◽

Bond Properties ◽

Particle Board ◽

Mechanical And Physical Properties

The objective of this study is to determine the mechanical and physical properties of Particleboard made from modified particle of Kelampayan (Neolamarckia cadamba). The particles were modified with Silane and Sodium Hydroxide (NaOH) by soaked the particle for 24 hours with different ratio ( Kelampayan + Silane, Kelampayan + NaOH, and Kelampayan + Silane + NaOH). The result showed that the mechanical and dimensional stability of the treated wood were improved. Particleboard made from 0.8 mesh particles treated with Silane and NaOH were highest value of bending strength modulus of rapture (MOR) 22.89MPa, modulus of elasticity (MOE) 3916.88MPa and Internal Bond properties 0.48214 MPa whereby particleboard made from 0.5 mesh particles treated by Silane were highest value for bending strength (MOR) 15.75MPa, MOE 2905.34 and Internal Bond properties 0.5748MPa.Outcome of this proposed research will provided valuable databases to the wood based industry to use Kelampayan as an alternative raw material in their down streams production such as particleboard, medium-density board and chipboard manufacturing.

Download Full-text