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1
Content available remote Wood raw material and manufacture costs of wood-based panels
Grzegorzewska E., Boruszewski P.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2018
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No. 104
390--394
EN
Due to development of furniture and building industries there has been a growth in companies’ demand for wood based panels, the production of which consumes, first of all, wood raw material. Acquisition and sale of wood in Poland is systematically increasing, however, a strong dynamic of industries connected with wood processing and other related fields leads to an increase in the level of deficit of this raw material. Moreover, the existing trend of rising wood prices calls for search of substitute materials, one of them being wood from plantations of fast growing trees. The article covers research findings into defining the importance of the type of wood material for economic profitability in the process of production of wood-based panels. In order to realize these assumptions there has been applied a modified method of Sunds Defibrator, which was used in the calculation of manufacture costs of MDF boards in the United States. The starting point were the costs resulting from technological process of MDF and chipboards.
2
Content available The impact of ultraviolet radiation on the colour and wettability of wood used for facades
Laskowska A., Dobrowolska E., Boruszewski P.
Drewno : prace naukowe, doniesienia, komunikaty
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2016
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vol. 59, nr 197
99--111
EN
The study examined the effect of UV radiation on the colour and wettability of cedar, gaboon, meranti and Scots pine wood. The tested species of exotic wood are mainly used in European countries for facades. For this kind of usage they act as a substitute for pine wood. In the study, the colour parameters were determined using the CIE L*a*b* colour space model. The tests showed that the most significant changes in the lightness of the wood occurred after 20 hours of UV radiation exposure. After that time, the L* value change was linear. The cedar wood turned the darkest and it also showed the greatest total change of colour ΔE. Comparable colour changes ΔE, and thus the greatest colour stability of all the tested wood species, were shown by the gaboon and meranti. In addition, it should be noted that all the tested wood species were characterized by a much smaller susceptibility to colour change under UV radiation than the pine sapwood and heartwood. The results also revealed that UV radiation significantly affects the contact angle, and therefore the surface free energy of the cedar and pine sapwood.
3
Content available remote An attempt to use postconsumer MDF as a raw material for the manufacture of particleboards
Borysiuk P., Byczek M., Jenczyk-Tołłoczko I., Boruszewski P., Monder S.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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No. 87
7--11
EN
An attempt to use postconsumer MDF as a raw material for the manufacture of particleboards. The aim of the study was to determine the influence of addition of mechanically grinded postconsumer MDF to the inner layer of particleboards on its properties. Three-layer particleboards with a predetermined density of 650 kg/m3 and a thickness of 16 mm and a weight fraction of MDF particles of 10, 20, 30 and 50 % to the inner layer were prepared. Manufactured boards were tested for the density and density distribution, MOR, MOE, IB, swelling and water absorption after 2 and 24 hours soaking in water. It was observed, that the addition of grinded postconsumer MDF to the inner layer of particleboards (in amount of 10 – 50 %) generally does not have negative effect on their mechanical properties and has a positive influence on the reduction of swelling and water absorption, especially when exposed to water for 24 h.
4
Content available Critical analysis of plywood production system model
Borysiuk P., Boruszewski P., Kowaluk G., Niziałek I., Grzegorzewska E.
Management and Production Engineering Review
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2013
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Vol. 4, No. 1
4-9
EN
The article attempts to analyze the process of plywood production of a Polish plywood manufacturer. The aim is to describe the possibility of change in the production process in order to optimize production and minimize waste. It also indicates the possibility of minimizing production costs. Costs reduction could be achieved by modernization of technology and production equipment, as well as through the optimization of human resources management. However, in case of each particular change, the specificity of the whole industry and individual plant must be taken into consideration.
5
Content available remote Plasma-chemical surface engineering of wood
Sokołowska A., Szawłowski J., Frąckowiak I., Rudnicki J., Boruszewski P., Beer P., Olszyna A.
Journal of Achievements in Materials and Manufacturing Engineering
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2009
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Vol. 37, nr 2
694-697
EN
Purpose: Wood infiltrated with nano-silica hydrosol forms a “weak”, irregular composite of components bound with hydrogen bonds only. The purpose of this study was to investigate the influence of low-energy ions bombardment on the structure and properties of the surface of this composite. The aim of these investigations was to produce a shallow “buried” layer of a dense wood-ceramic composite on a wood surface . Design/methodology/approach: D.c. glow-discharge in N2/H2 (9:11) atmosphere under a pressure of 4hPa was the source of ions. A beech plate was placed on the cathode. The temperature of wood was 200°C. The material collected from the wood-silica composite surface was investigated with FTIR spectroscopy and SEM observations. The surface energy was determined with the use of contact angle measurements. Findings: The ions influenced silica only. The nano-particles underwent sintering changing its medium size twice and a small I.R. peak of N2 trapped in SiO2 suggest the possibility of silica nitriding. A buried, continual surface layer of sintered silica did not form. The surface energy of the “wood-silica” plate was slightly decreased after plasma treatment. Research limitations/implications: The results proved the possibility of plasma treatment of wood even in a d.c. glow-discharge under low pressure. Silica sintering, a difficult process which in a thermal way has to be carried out at a temperature of 1000°C, taking place in a plasma at a temperature of 200°C showed the very special nature of an influence of ions. Originality/value: The plasma surface treatment of wood in the d.c. glow-discharge (GD) under reduced pressure has not been investigated. There are only publications about glow-dielectric-barrier-discharge (GDBD) at atmospheric pressure applications for wood surface modification. The energy of ions in GDBD is much smaller than that of ions in GD and therefore the application of glow discharge under reduced pressure to wood surface treatment can be more efficient.
6
Content available remote Uszkodzenia materiałów budowlanych przez owady
Boruszewski P.
Materiały Budowlane
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2005
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nr 4
108-108
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