Thermal Parameters of Beech Wood Dust

AbstractDynamic water vapor sorption experiments were carried out using beech wood dust (from untreated and thermally modified wood) of two-particle sizes, (< 25 and 80–250 µm), obtained from abrasive sanding. Sorption isotherms were parameterized with the GAB and GDW models. Dust from thermally modified wood had significantly lower equilibrium moisture content compared to dust from untreated material, due to the reduction in primary sorption sites in treated material. The observed changes were quantified by the coefficients of the GAB and GDW models. Thermal modification and size of wood dust particles had no influence on binding energy of water molecules being linked to the secondary sorption sites. Water diffusivity decreased significantly with increasing moisture content, but only for monolayer sorption. For higher moisture content values, water diffusivity was practically independent of moisture content. These results were found for untreated and thermally modified material as well as for both dust size fractions. The influence of thermal modification on water diffusivity was unclear, which is attributed to the diffusion model, which represents dust particles as spheres and assumes instant hygroscopic equilibrium. Overall, this study indicates that the effectiveness of filtration processes likely depends strongly on sorption and diffusion properties of wood dust only at low moisture contents within the hygroscopic range.

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Laboratory Investigations Applied to Wood Dust Emmited by Electrical Hand-Held Belt Sander

Management Systems in Production Engineering ◽

10.1515/mspe-2018-0021 ◽

2018 ◽

Vol 26 (3) ◽

pp. 133-136 ◽

Cited By ~ 1

Author(s):

Miroslav Dado ◽

Lucia Mikušová ◽

Richard Hnilica

Keyword(s):

Wood Species ◽

Mass Concentration ◽

Beech Wood ◽

European Beech ◽

Grit Size ◽

Wood Dust ◽

Breathing Zone ◽

Significance Level ◽

Fagus Sylvatica L ◽

Full Factorial

Abstract Aim of this paper was to investigate the effects of grit size and wood species on mass concentration and size distribution of wood dust produced by hand-held belt sander. Experimental study was designed as 2x2 full factorial experiments. Experimental parameters and their levels were abrasive grain size (P80, P120) and wood species (European beech (Fagus sylvatica L.), Norway spruce (Picea abies)).The mass concentration of emitted wood dust was measured using aerosol monitor (TSI Inc., DustTrak DRX 8533). Sampler head was sited in place representing breathing zone of operator of sander. The results was analysed employing the analysis of variance (ANOVA) with 5% of significance level. Real-time measurements demonstrated that spruce wood generated higher dust concentrations than beech wood due to difference in abrasion durability. Compared to sanding belt with P80 grit size, approximately 16%-32% higher dust concentration was generated when the sanding belt with P120 grit size was used.

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Pilot-Scale Study on the Specific Resistance of Beech Wood Dust in a Pulse-Jet Filter

Sustainability ◽

10.3390/su12124816 ◽

2020 ◽

Vol 12 (12) ◽

pp. 4816

Author(s):

Zbigniew Potok ◽

Tomasz Rogoziński

Keyword(s):

Specific Resistance ◽

Beech Wood ◽

Pilot Scale ◽

Resistance Coefficient ◽

Dust Concentration ◽

Filter Medium ◽

Filtration Velocity ◽

Wood Dust ◽

High Concentration ◽

Pulse Jet

The specific beech wood dust resistance coefficient values were experimentally determined in the condition of pulse-jet filtration using a pilot-scale baghouse. The experiments were carried out for two variants of the filter medium. One of them had a PTFE (Polytetrafluoroethylene) membrane on the working surface. Three values of filtration velocity and seven levels of dust concentration at the filter inlet were used to determine the variability of the specific resistance coefficient of beech wood dust accumulated on the filter medium. The values of the specific beech wood dust resistance coefficient depend on filter medium finishing and filtration parameters: filtration velocity and dust concentration at the filter inlet. The high concentration of dust at the filter inlet and low filtration velocity should be used, especially in filters with surface finished media, for the reduction in pressure drop, which would affect in a significant reduction of energy consumption.

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Occupational rhinitis caused by beech wood dust

Allergy ◽

10.1034/j.1398-9995.1999.00940.x ◽

1999 ◽

Vol 54 (4) ◽

pp. 405-405 ◽

Cited By ~ 4

Author(s):

M Hernandez ◽

MC Sánchez‐Hernandez ◽

V Moreno ◽

P Guardia ◽

J Delgado ◽

...

Keyword(s):

Beech Wood ◽

Wood Dust ◽

Occupational Rhinitis

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Can Surface Coating of Circular Saw Blades Potentially Reduce Dust Formation?

Materials ◽

10.3390/ma14185123 ◽

2021 ◽

Vol 14 (18) ◽

pp. 5123

Author(s):

Roman Myna ◽

Raphaela Hellmayr ◽

Maria Georgiades ◽

Lena Maria Leiter ◽

Stephan Frömel-Frybort ◽

...

Keyword(s):

Surface Coating ◽

Occupational Safety ◽

Beech Wood ◽

Surface Oxidation ◽

Wood Dust ◽

Net Energy ◽

Additional Measure ◽

Circular Saw ◽

Electrostatic Charging ◽

Saw Blade

Coating of steel is a frequently applied approach to increase the resistance of moving machine parts towards abrasion, surface oxidation, and corrosion. Here, we show that plating circular saw blades with certain metals can help to reduce the electrical charging of wood dust during cutting, which has significant implications for occupational safety, healthcare, and lifetime of filter systems. With the example of beech wood planks, machine net energy consumption EV (J cm−3) and cumulated field strength E→V (kV m−4) as caused by electrically charged particles were compared for cutting of 10- and 20-mm deep grooves (800 mm length) using saw blades of different toothing (24, 60 teeth) and surface coating (Cu, Ag, and Cr). To ensure uniform feed per tooth (fz = 0.063 mm), saw blades were operated at different rotation speeds (4000 vs. 1600 rpm). The results demonstrate that the extent of electrostatic sawdust charging can be manipulated to a certain extent by the type of saw blade plating. Coating with chromium turned out to be most effective in shifting the electrostatic charge of the wood particles towards neutralization. Lowering of rotation speed using circular saw blades of higher toothing was an additional measure significantly reducing electrostatic charging of wood dust. Hence, cutting with a chrome-coated blade with 60 teeth can be specifically recommended as the reduction of electrical saw dust charging is not associated with higher machine power consumption.

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