The impact of drying and steaming processes on surface color changes of tension and normal beech wood

Klement, Ivan; Vilkovská, Tatiana; Barański, Jacek; Konopka, A.

doi:10.1080/07373937.2018.1509219

Cited by 12 publications

(8 citation statements)

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“…The method uses heated steam as a drying medium and resulting materials are considered as a hybrid thermally treated wood. The specific settings of the drying schedule were adopted taking into consideration available recommendations [ 43 , 44 ]. The process consisted of two-stages where temperature of the medium in the kiln increased from 65 °C (stage one) to 80 °C at the second stage.…”

Section: Methodsmentioning

confidence: 99%

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

et al. 2020

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The modern wood converting processes consists of several stages and material drying belongs to the most influencing future performances of products. The procedure of drying wood is usually realized between subsequent sawing operations, affecting significantly cutting conditions and general properties of material. An alternative methodology for determination of mechanical properties (fracture toughness and shear yield stress) based on cutting process analysis is presented here. Two wood species (pine and beech) representing soft and hard woods were investigated with respect to four diverse drying methods used in industry. Fracture toughness and shear yield stress were determined directly from the cutting power signal that was recorded while frame sawing. An original procedure for compensation of the wood density variation is proposed to generalize mechanical properties of wood and allow direct comparison between species and drying methods. Noticeable differences of fracture toughness and shear yield stress values were found among all drying techniques and for both species, but only for beech wood the differences were statistically significant. These observations provide a new highlight on the understanding of the effect of thermo-hydro modification of wood on mechanical performance of structures. It can be also highly useful to optimize woodworking machines by properly adjusting cutting power requirements.

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Section: Methodsmentioning

confidence: 99%

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

et al. 2020

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“…The main aim of milling is to create a workpiece with the requested shape, dimensions and surface quality [1,2]. For productive, effective and economically viable milling it is important to fully understand the milling [3][4][5][6][7]. The quality of the milled surface is affected by various factors.…”

Section: Introductionmentioning

confidence: 99%

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

et al. 2018

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The issue of the change in tool temperature as a result of the machining process is presented in this paper. The aim of the paper is to put forward a proposal and subsequently to verify the methodology of temperature monitoring in the process of computer numerical control (CNC) machining in real time. Subsequently, the data can be used in the process of adaptive machine-tool control. Experiments were used to determine whether the research method is appropriate. Oak, beech and spruce wood turning blanks with the thickness of 20 mm were machined using a 5-axis CNC machining centre. A temperature change observation resulting from the changes in parameters of the removed layer was used to test whether the research method is relevant. Parameters of the removed layer were affected by the changes in feed rate in the range from 1 ÷ 5 m·min−1 in the removed layer (1–5 mm) or in wood species used in the experiment. As emerges from the proposed methodology, it is possible to monitor the changes in tool temperature responding to minimal changes in technological parameters on a relatively small size of a milled surface quite accurately. Sensitivity to given changes in technological parameters as well as the importance of the methodology was proven.

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“…The drying medium parameters inside the kiln were measured using an E+E Elektronik EE31 humidity/temperature transmitter (E+E Elektronik Ges.m.b.H, Engerwitzdorf, Austria) with accuracies of 1.3% for humidity and 0.2 °C for temperature. The drying process was organized by the control system in two-stage process (Baranski 2018;Klement et al 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Intermediate and final kiln conditions can be modified to speed drying without fear of internal defects. To relieve residual stresses at the end of drying process and thus avoiding distortion when material is re-sawed or machined to an asymmetric pattern, the final conditioning treatments must be used (Barański et al 2017;Baranski 2018;Klement et al 2019). On other hand, low quality of dried lumber not only affects the wood's monetary value, but also affects several of its workability properties, including those of planing, shaping, turning, boring, mortising, and sanding (Gu et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Deformation and surface color changes of beech and oak wood lamellas resulting from the drying process

Barański

Konopka

Vilkovská

et al. 2020

BioRes

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The drying process was examined relative to parameters’ influence on the deformation and surface layer color changes of beech wood (Fagus sylvatica L.) and oak wood (Quercus robur L.). The goal was to analyze the impact of drying process conditions, wood and growth rings types, and load on the deformation and surface color changes of drying thin wooden elements. A further aim was to reduce the time of the lamella drying and minimize wood products defects. During each drying, 40 pieces of wood were dried, divided into two groups. For the first group, 30 pieces were dried under a uniformly distributed load of approximately 50 kg, while for the second group, 10 samples were dried without weight. The lamellas dried under load exhibited fewer cup, bow, and twist deformations than the lamellas dried without load. Cracks in the dried lamellas occurred comparably in those dried under and without load. Color changes in the specimens before and after drying were observed and measured. The differences in colorimetric parameters (a, b, and L) between wood without defects and with defects were less marked after drying than before drying. The color changes were only noticed in the surface layers of the specimens.

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The impact of drying and steaming processes on surface color changes of tension and normal beech wood

Cited by 12 publications

References 12 publications

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

Deformation and surface color changes of beech and oak wood lamellas resulting from the drying process

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