This work presents the effect of steaming beech, birch and maple woods on resulting quality milled wood surface. The process studied results in a targeted change color wood, which changes from original light white-gray to fine reddish-brown dark brown shades that are more or less saturated depending temperature water steam. achieved during modification were identified using coordinates CIE L*a*b* space. described through total difference ΔE* defined classification grades scale. technological...

Abstract In the paper influence of moisture content wood on heat losses and thermal efficiency a boiler is analysed. The has negative effect, especially flue gas loss. mathematical dependence presented for following boundary conditions: 10-60%, range temperatures emitted gases from into atmosphere 120-200 C, emissions meeting emission standards: carbon monoxide 250 mgm −3 , fly ash 50 power 30-100%.

The goal of this work is to investigate the impact thermal modification birch wood with saturated steam on particle size distribution sawing and milling process. Birch (Betula pendula Roth) an excellent source produce plywood boards. Wastes from mechanical processing are suitable composite materials. Granulometric analyses chips processes PRW 15M frame saw, as well 5-axis CNC machining centre SCM TECH Z5 AX320 Pinnacle, proved that more than 95% coarse medium chip fractions dimensions above...

In this paper, we present an analysis on the effect of moisture content firewood atmospheric thermal load created by heating flue gases with temperatures tfg = 120–200 °C, emitted a boiler when wood W 10%–60% is combusted. The atmosphere heat ts 120 °C from boiler, where dried 10% combusted, Q 9.2 MJ·GJ−1. caused temperature 200 resulting combustion process wet 60%, 3.8 times higher compared above-mentioned conditions. water vapor evaporated occurring in combusted wood, as well heated...

The experimental results of the study focused on effect drying processes warm air at temperature 6580°C and air-steam mixture 105°C pine beech wood to size sawdust grains created by cutting using RPW 15M frame saw is presented in paper. Particle analysis dry was performed two methods - screening method optical based image obtained from a microscope. showed that mode did not affect particle distribution sawdust, but dried with steam characterized finer particles.

Abstract The paper analyzes the influence of humidity combusted wood biomass on flue gas losses. A mathematical relation between losses boiler is presented as well temperature emitted from into atmosphere. limits model application for falls interval 10–60% whereas range temperatures gases to atmosphere 120–200 °C. has an adverse effect increasing extent and thus inefficiency heat production. increase value 10% 60% with outlet 120 °C causes in loss 8.37% 12.43%, similarly by 200 15.19%...

This paper estimates and discusses the specific belt sanding resistance K (N·cm-2) intensity SI (g·cm-2·min-1), for wood of Pinus sylvestris L., Picea abies Quercus robra Acer pseudoplatanus Alnus glutinosa Gaertn., Populus Nigra by different pressure pS, grit NG number, grain angles Phi(v).

The presented paper deals with a mutual comparison of the roughness sanded radial surface after an eccentric and belt sander. beech wood (Fagus sylvatica L.) was sander ETS 125 REQ-PLUS BS-75 E-set from Festool grit sizes P40, P60, P80, P100, P120 P150. evaluation parameters Ra, Rp, Rv, Rz, Rt carried out using digital microscope 2.5 mm L-filter 8 μm S-filter under conditions technical standard STN EN ISO 21920. measured results were supported microscopic analysis topography especially for...

The aim of the paper is to determine change color wood Fagus sylvatica in CIE L*a*b* space during process thermal treatment woodturning blanks with dimensions 40 x 90 800 mm by saturated water steam at temperature from interval t = 105 °C 135 and time 3, 6, 9, 12 hours. Wet beech loses its brightness due hydrolysis hemicelluloses extraction water-soluble substances. takes on shades varying red-brown intensity changes chromatic coordinates, increasing values red coordinate a* slight yellow...

The paper deals with the suitability of Finet PES 4 filter fabric in FR-SP 50/3 for extraction exhausted chips from SCM Tech Z5 CNC machining center. From granulometric analysis shows that, about two thirds share deciduous woods are fractions more than 2 mm. proportion this fraction spruce was 27.93 %. Depending on shape, these fall into category flat chips. particle grain range 125 µm ÷ mm fibrous chips, i.e. chip is significantly extended one direction. dust formed by isometric particles...

The aim of this paper is the issue a sustainable manufacturing process in context woodworking by sanding, as one most important technological operations before its final treatment, focusing on selected pillar process, waste management. first step experiment was to optimize pressures sanding means surface. optimal pressure 1.04 N·cm−2 chosen. second level obtain wear curves abrasive with grain size 80 (evaluated wood removal) and dependence direction (along perpendicular fibres 60° fibres)...

The effect of the climate Slovak Republic on firewood consumption in order to create thermally comfortable indoor environment is analysed paper. Atmospheric temperature range from -11 °C -18 and length heating period ranging 202 – 253 days individual parts Slovakia affect heat loss a detached house fuel necessary thermal comfort. Presented model can be used quantify annual regarding Slovakia. Moreover, moisture content, energy efficiency wood burning stoves heated premises specifically for...

The effect of moisture content black locust sawn timber with the thickness h = 32 mm on steam consumption during colour modification process by saturated water temperature t 137 ± 2.5 °C for τ 7.5 hours in autoclave APDZ 240 is analysed contribution. increase 1 m3 wood Δw 10 % to interval w 40 – 100 results Δm´´ 20.15 kg.m−3. result that 99 99.5 power enters at beginning order heat and technological can be stated following analysis dependence process.

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Ladislav Dzurenda, Adrián Banski; Model of emissions production from wood combustion in the creation thermal comfort a heated building depending on climatic conditions Slovakia. AIP Conf. Proc. 14 February 2023; 2672 (1): 030007. https://doi.org/10.1063/5.0121319 Download citation file: Ris (Zotero) Reference...

Tilt Angle of Wood Dust. The aim this article is to point out a risk factor – wood dust, which settles on various structures, inclined surfaces in operation and, if not regularly cleaned, it source secondary because swirled up again with any movement. By measuring the tilt angle bulk material obtained from sawing table circular saw, using different saw blades and dust longitudinal transverse sanding hand belt sander, we determined characteristics affect it. We found that size particles an...

The study assessed the changing of Ra, Rp, Rv and Rz roughness parameters sanded beech surface (Fagus sylvatica L.) as a function different grit sizes measurement direction. milled samples were ground with belt sander BS-75 E-set from Festool P60, P100 P150. sanding belts Rubin 2 Festool. Roughness was evaluated using Keyence VHX-7000 digital microscope. evaluation length 12.5 mm (λc = 2.5 λs 8 mm). R-parameters measured in accordance latest standards ISO 21920 (2022) direction parallel to...

The paper discusses the particle size of chips formed in process machining unsteamed and steamed alder wood on a CNC center. From granulometric analysis chips, it follows that average share coarse fraction created from is 66.0% 62.9%. representation medium-coarse fractions with dimensions 1.0-0.125 μm 29.5% by 32.7%. Dust below 125 account for 4.5% 4.4%. Chips non-steamed or 32 were not measured, so can be concluded no respirable dust particles < 10 are formed. Changes physical mechanical...

The paper presents a model of the influence climatic conditions Slovakia on consumption firewood and production emissions in creating thermal comfort heated building. temperature atmospheric air range from -11°C to -18°C winter number days heating period 202-253 individual localities is reflected size heat losses building, fuel production. presented allows balance emission for based locality, object, efficiency boiler type firewood.