Pretreatment of pine needles/wood particles and their composites with isocyanate prepolymer adhesive

2012 ◽  
Vol 53 (8) ◽  
pp. 1740-1750 ◽  
Author(s):  
Monika Chauhan ◽  
M. Gupta ◽  
B. Singh ◽  
S.K. Bhattacharyya ◽  
A.K. Singh ◽  
...  
Keyword(s):  
Pine Needles ◽  
Wood Particles ◽  
Isocyanate Prepolymer

SIFAT MEKANIK PAPAN GYPSUM DARI SERBUK LIMBAH KAYU NON KOMERSIAL

2014 ◽  
Vol 6 (2) ◽  
pp. 1
Author(s):  
Saibatul Hamdi
Keyword(s):  
Raw Materials ◽  
Wood Particle ◽  
Quality Standards ◽  
Gypsum Board ◽  
Average Value ◽  
Wood Particles ◽  
Sawn Timber ◽  
Materials Used ◽  
Artocarpus Elasticus ◽  
Ficus Glomerata

The purpose of this research is to know the mechanical strength of gypsum board by utilizing waste sawn wood. Raw materials used consist of flour, gypsum,wood particles, boraks and kambang (Goniothalamus sp), wood tarap (Artocarpus elasticus REINW) and lua (Ficus glomerata ROXB). Wood particle 40 mesh and 60 mesh, concentrations boraks of 1 and 2 and the percentage particles of gypsum sawn timber is 300, 400 and 500%. The results showed that the average value Modulus of Rufture (MoR) in lua wood ranges from 12.55 – 14,47 kgcm2, wood kambang 25.10-31,11 kgcm2 and wood tarap 19.20- 24,18 kgcm2. As for Modulus of Elasticity (MoE) on the lua 1129,80- 2092,70 kgcm2, wood kambang 2512,37-3971,32 kgcm2 and tarap 2050,63-2691,09 kgcm2. Gypsum board are mechanical properties do not meet quality standards created SNI 03-6434-2000.Keywords: sawdust, lua, kambang, tarap, gypsum, mechanical

Enhancing the mechanical and water resistance performances of bamboo particle reinforced polypropylene composite through cell separation

Holzforschung ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dan Ren ◽  
Xuexia Zhang ◽  
Zixuan Yu ◽  
Hankun Wang ◽  
Yan Yu
Keyword(s):  
Water Absorption ◽  
Cell Separation ◽  
Water Resistance ◽  
Dynamic Mechanical Properties ◽  
Simple Method ◽  
Interface Modification ◽  
Wood Particles ◽  
Bamboo Fibers ◽  
Pp Composites ◽  
Mechanical Performances

AbstractIt is frequently observed that bamboo particle composites (BPCs) do not show higher mechanical performances than the corresponding wood particles composites (WPCs), although bulk bamboo is much stronger than wood in mechanical performances. Herein this phenomenon was demonstrated from the cell compositions in the applied bamboo particles. To address that, a simple method to physically separate bamboo fibers (BFs) and bamboo parenchyma cells (BPs) from a bamboo particle mixture was developed. Polypropylene (PP) composites with pure BFs, BPs, a mixture of BFs and BPs (BFs + BPs), wood particles (WPs) as fillers were prepared. The flexural and dynamic mechanical properties, water absorption, and thermal properties were determined. The BF/PP composites showed the best mechanical performances (MOR at 35 MPa, MOE at 2.4 GPa), followed by WP/PP, (BF + BP)/PP, and BP/PP. They also exhibited the lowest water absorption and thickness swelling. Little difference was found for the thermal decomposition properties. However, a lower activation energy of BF/PP compared with BP/PP implied an uneven dispersion of BFs and weaker interfacial interaction between BF and PP. The results suggest that the mechanical performances and water resistance of bamboo particle/polymer composites can be significantly improved through cell separation. However, interface modification should be applied if higher performances of BF/PP composites are required.

Modeling of Coal-Biomass Fluidization Using Computational Fluid Dynamics

2013 ◽  
Author(s):  
Bahareh Estejab ◽  
Francine Battaglia
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Hybrid Poplar ◽  
Particle Interactions ◽  
Particle Mixing ◽  
Bed Height ◽  
Wood Particles ◽  
Computational Fluid Dynamics Cfd ◽  
Computational Platform

In an effort to assess the fluidization characteristics of coal-biomass mixtures, computational fluid dynamics (CFD) was used and validated. The gas and solids phases were modeled using an Eulerian-Eulerian approach to efficiently simulate the physics. The computational platform Multiphase Flow with Interphase eXchanges (MFIX) was employed to simulate the particle-particle interactions of coal-biomass mixtures and compare the predictions with experimental data. The coal-biomass mixtures included sub-bituminous coal and hybrid poplar wood. Particles properties of both materials fall within the Geldart A classification. Of particular interest to this study was predicting particle mixing in fluidized beds and biomass hydrodynamics. Both materials and two mass ratio mixtures were studied and pressure drop across the bed for various gas inlet velocities and bed height were analyzed and compared to the experiments.

A comparative study of the effects of fire retardants on the pyrolysis of cellulose and Pinus halepensis pine-needles

1995 ◽  
Vol 31 ◽  
pp. 85-100 ◽  
Author(s):  
A.A. Pappa ◽  
N.E. Tzamtzis ◽  
M.K. Statheropoulos ◽  
S.E. Liodakis ◽  
G.K. Parissakis
Keyword(s):  
Comparative Study ◽  
Pinus Halepensis ◽  
Pine Needles ◽  
Fire Retardants

Rapid microwave-assisted acid extraction of southern pine waste wood to remove metals from chromated copper arsenate (CCA) treatment

Holzforschung ◽  
2013 ◽  
Vol 67 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Chung Y. Hse ◽  
Todd F. Shupe ◽  
Bin Yu
Keyword(s):  
Recovery Rate ◽  
Chromated Copper Arsenate ◽  
Copper Extraction ◽  
Acid Extraction ◽  
Southern Pine ◽  
Waste Wood ◽  
Total Recovery ◽  
Wood Particles ◽  
One Step ◽  
Copper Arsenate

Abstract Recovery of metals from chromated copper arsenate (CCA)-treated southern pine wood particles was investigated by extraction in a microwave reactor with binary combinations of acetic acid (AA), oxalic acid (OxA), and phosphoric acid (PhA). Use of OxA was not successful, as insoluble copper oxalate complexes impeded copper removal. The combination of OxA and AA also had adverse effects on copper extraction. In contrast, the combination of AA and PhA enhanced the chromium recovery rate. The highest recovery rate of metals could be achieved with a mixture of 2.75% PhA and 0.5% AA at 130°C for 10 min in the microwave oven. The total recovery rate approached 100% for arsenic, 96.7% for chromium, and 98.6% for copper in a one-step process.

scholarly journals ENERGY PROPERTIES OF WOOD PARTICLES TORREFIED AT DIFFERENT TEMPERATURES

2017 ◽  
Vol 41 (4) ◽  
Author(s):  
Carlos Miguel Simões da Silva ◽  
Benedito Rocha Vital ◽  
Angélica de Cassia Oliveira Carneiro ◽  
Aylson Costa Oliveira ◽  
Solange Oliveira Araújo ◽  
...  
Keyword(s):  
Untreated Wood ◽  
Control Group ◽  
Fixed Carbon ◽  
Final Temperature ◽  
Heating Value ◽  
Physical Chemical ◽  
Wood Particles ◽  
Different Temperatures ◽  
Fixed Carbon Content ◽  
Positive Effect

ABSTRACT The objective of this study was to evaluate the effect of the final torrefaction temperature on the energy properties of wood. It was applied four treatments with three replicates, consisting of untreated wood particles and particles torrefied at temperatures of 170, 220 and 260ºC. Better physical, chemical and thermal properties of the particles were observed as a function of the torrefaction temperature. Comparing with the control group, the particles torrefied at the highest final temperature (260ºC) showed significant differences in bulk density - from 239 to 396kg/m3; the equilibrium moisture content changed from 12.3 to 5.7%; fixed carbon content - from 13.0 to 24.8%; heating value - from 4,465 to 4,945kcal/kg; and energy density - from 882 to 1,727Mcal/m3. It was concluded that torrefaction had a positive effect on the energy properties of the wood.

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