WOOD. Research papers. Reports. Announcements - No. 175 2006

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ISSN 1644-3985

 

Contents


RESEARCH PAPERS
Ewa Ratajczak, Aleksandra Szostak, Gabriela Bidzinska: 
Construction as a main user of wood materials and products
(Polish language version)
 5
Ginter J. Hruzik: 
Consumption of wood raw material and wood materials in products of the sawmill industry
(Polish language version) 
25 
Maria Krajcovicova: 
Introduction into problematic of material flow
(English language version) 
45 
Jarosław Banecki, Magdalena Nowaczyk-Organista, Tomasz Oleszek:
Studies on utility properties of waterborne or high solids furniture lacquer coatings compared with the properties of solvent-based
(English language version)
53 
Iwona Frackowiak: 
Influence of urea-formaldehyde resin molar ratio on the properties of consolidated boards made of waste lignocellulosic raw materials 
(Polish language version)
71 
Marek Juszczak: 
Apple tree branches thermal utilization in a heating boiler
(English language version)
87 

REPORTS 
Stanislaw Wilkus: 
Noise in a sawmill
(Polish language version) 
99 

ANNOUNCEMENTS 
Andrzej Fojutowski: 
Forest-Based Sector Technology Platform has started the implementation of the Strategic Research Agenda
(Polish language version)  
105
Michal Rogozinski: 
VIth scientific conference Möbeltage 2006 in Dresden
(Polish language version)  
109 
Wladyslaw Strykowski: 
The use wood energy in some European countries
(Polish language version)
113

 

Summaries

 

RESEARCH PAPERS

Ewa Ratajczak, Aleksandra Szostak, Gabriela Bidzinska: 
Construction as a main user of wood materials and products
(Polish language version)

This article presents results of research which enable a comprehensive analysis of market in wood materials and products used in construction. By using the index method, for the first time in Poland there was made a quantification of the use of wood materials and products in this branch of the economy. The quantification took into account types of materials, as well as segments of the construction market. Additionally, the market in wood materials and products was scrutinized, which allowed to assess their significance at a national level in one of the main branches of the Polish economy.
Research supported the view that construction plays a significant role in creating demand for many very diverse wood products. In this branch of the economy all kinds of wood materials - solid and wood-based - are used to different degrees. Construction uses low-processed products (e.g. boarding formworks or fences of construction sites), but also high-processed goods of special strength properties and quality parameters (e.g. large-size structural elements, indoor equipment and arrangement elements, floorings, windows and doors, and wooden houses).
Calculations made using a developed index method show, that almost 6 million m3 of wood materials were used in the Polish construction industry in 2004. It was 37% of total production of these materials. Among the construction wood materials used, sawnwood is dominant, but OSB and particleboards are of great importance as well. According to the carried out analysis, in 2004 the construction industry used 4.3 million m3 of timber and semi-finished products of sawnwood, 490 thou. m3 of OSB, 390 thou. m3 of particleboards and 100 thou. m3 of HDF.

Ginter J. Hruzik: 
Consumption of wood raw material and wood materials in products of the sawmill industry
(Polish language version) 

Recently, purchasers' have more and more often submitted special requirements towards sawmill products concerning quality. It is connected to processing of raw material of specific properties, adequate to particular uses. Material efficiency has been becoming a tool to optimize the choice of raw material so as to get a specified production effectiveness. The article presents exemplary material efficiencies of main sawmill products. The efficiencies are the results of research. It was observed, that relatively high material efficiency was obtained in the production of higher-processed materials, such as: floorings, wainscot elements, elements of wooden houses, structural elements of builder's carpentry and joinery.

Maria Krajcovicova: 
Introduction into problematic of material flow
(English language version) 

This article is deal with close characteristics of the material flow and classification of the material. This knowledge can be helpful to projection of material flows in industries. As material flow is more quality and better projected, then company will have better predictions for economical and qualitative growth.

Jarosław Banecki, Magdalena Nowaczyk-Organista, Tomasz Oleszek:
Studies on utility properties of waterborne or high solids furniture lacquer coatings compared with the properties of solvent-based
(English language version)

This paper presents chosen results of studies of basic utility properties of furniture lacquer coatings made of waterborne, high solids or solvent-based products by using industrial coating technologies applied in contemporary domestic furniture factories. A comparison of the properties of furniture coatings produced of solvent-based lacquers with the properties of  the coatings made of products of less organic solvents content such as waterborne and solvent high solids ones, was presented in the paper. The evaluation of replacement possibility of solvent-based products with waterborne and high solids ones in industrial coatings taking into account their utility properties, was done.

Iwona Frackowiak: 
Influence of urea-formaldehyde resin molar ratio on the properties of consolidated boards made of waste lignocellulosic raw materials 
(Polish language version)

The aim of the tests was to identify and quantify the influence of molar ratio of urea-formaldehyde glue resin on the properties of panels made from disintegrated rape straw and sawdust. The tests aimed at getting an answer to the following question: whether and at which molar ratio it is possible, using the above-mentioned lignocellulosic raw materials, to produce panels which would meet requirements for particleboards intended for indoor equipment and furniture production (P2).
Straw of rape variety Lisek was purchased in the form of a pressed bale in the Rolniczo-Sadownicze Gospodarstwo Doświadczalne (Experimental Farm) Przybroda of the August Cieszkowski Agricultural University of Poznań. Wood waste in the form of sawmill sawdust was taken from a heap located at the wood raw material yard which is located at the premises of one of the wood-based panels producers. Within the scope of the project, the panels were produced with the use of glue resins prepared at the Technological Laboratory of one of national producers of glue resins for the wood-based panels industry. Properties of disintegrated straw and sawdust and also glue resins were tested. Methodology of panel's production was based on the assumptions mentioned below. The following technological parameters were constant factors: lignocellulosic raw material - rape straw 30%, sawdust 70 % of the raw material mass, nominal thickness - 16 mm, nominal density 680 kg/m3, panel structure - three layers, drying conditions and moisture content of lignocellulosic particles after drying, degree of gluing, type and amount of hardener and paraffin emulsion, method of forming, temperature and pressing schedule, conditions of panels seasoning. The variable factor was the molar ratio of formaldehyde to urea in glue resins used for the production of panels. Panel properties were tested according to effective methodical standards.
The tests showed that basic properties of panels: bending strength and tensile strength, and formaldehyde content in panels made from disintegrated straw and sawdust are closely related to the molar ration of urea-formaldehyde resin. Values of the above-mentioned properties increase as the molar ratio of formaldehyde to urea goes up, while swelling of panels after soaking in water decreases. Values of determination factors (R2) for the linear regression describing the aforementioned relations were ranging form 0.97 to 0.99. If we use an adequate urea-formaldehyde resin and technological parameters similar to the industrial ones, it is possible to produce from disintegrated rape straw and pine sawdust panels which meet the requirements for particleboards intended for indoor equipment and furniture production.

Marek Juszczak: 
Apple tree branches thermal utilization in a heating boiler
(English language version)

Thermal utilization was performed in a heating boiler of 25 kW heat power, Polish production, working together with water heat storage. The heat station belongs to the Poznan University of Technology, Division of Heating, Air  Conditioning and Air Protection of thermal utilization apple tree branches was performed in the boiler in two steps: pyrolisis and wood gas combustion in the nozzle. The air was supplied to the pyrolisis chamber and to the nozzle using one fan. Automatic device for the air stream rate regulation was not used. Before the investigation, the boiler was preheated and  the boiler water temperature obtained the value of 75°C and 67°C (supply and return). At the same time, the temperature in the  pyrolisis chamber reached 190°C and in the flame in the nozzle 740°C. In this conditions, CO concentration in flue gases obtained the value of 5758 mg/Nm3 (dry gas) and NOx concentration 216 mg/Nm3, (both concentrations are normalized to 6% of oxygen in flue gases). Both these values are lower tham the values permitted by Polish regulationaules. The measurement lasted 134 minutes and 36.1 kg apple tree branches  were utilized. Measured  flow and thermal parameters as well as gas concentration values were registered manually every two minutes and  gatherer in a table to find the correlation between temperatures in the pyrolisis chamber and flame in the nozzle, air excess rate (or oxygen concentration) and CO, NO, NOx concentrations. Thermal utilization was carried out with very good results,  the mean values of CO, NO, NOxconcentrations in flue gases during the whole measurement were low. Dust concentration was measured, heat efficiency and pollutant indicators were calculated. Apple tree branches of  moisture content about 15 %, about 50 cm long, 2 to 6 cm in diameter (obtained from sanitary tree branch cutting in a garden and dried first for one year in a  closed space) can be combusted without excessive environment pollution in a domestic heating boiler with manual fuel supply if the boiler is preheated first and wooden branches are supplied to the boiler in time, so that the boiler is working almost continuously with the heat power above 50 % of its maximum value.

REPORTS

Stanislaw Wilkus: 
Noise in a sawmill
(Polish language version) 

The aim of the test was to determine the noise risk at typical working stations in a sawmill.
In case of 4 out of 5 tested working stations the level of a worker's exposure to noise exceeded the permissible normative values and reached 85 dB(A), and at the fifth station it was 84,21 dB(A) due to the fact that noise is recorded there only for one hour during the working hours.

ANNOUNCEMENTS 

Andrzej Fojutowski: 
Forest-Based Sector Technology Platform has started the implementation of the Strategic Research Agenda
(Polish language version)
  

European technology platforms are a specific kind of tools proposed by the European Union for cooperation between industry and science, especially in the scope of research. 
Forest-Based Sector Technology Platform prepared the Strategic Research Agenda. This is a document presenting ideas for innovation, competitiveness and quality of life connected with forestry and wood products. The conference "From Vision to Reality - Implementing the Strategic Research Agenda" was held on 2 -3 May 2006 in Admont, Austria. The main parts of the document were shortly presented there.

Michal Rogozinski: 
VIth scientific conference Möbeltage 2006 in Dresden
(Polish language version)
  

Furniture making is one of key sectors of industry and services in many European countries. Modern furniture has become high-processed goods, and production processes require more and more advanced technologies. The modern furniture making is connected with economics, marketing, logistics and furniture transfer. These issues were the subject matter of the scientific conference Möbeltage in Dresden, which aimed at multifaceted discussion on prospects for furniture making development in the context of advances in production technology, surface finishing, design, and also requirements of the EN standards. Matters of furniture market economics, economic conditions and furniture supply in different parts of Europe were also discussed.

Wladyslaw Strykowski: 
The use wood energy in some European countries
(Polish language version)

The use of wood energy is one of main problems in European countries. This issue was the subject matter of the 28th Session of the Joint FAO/UNECE Working Party on Forest Economics and Statistics. At the session a document prepared by the Secretariat of the UNECE/FAO Timber Section entitled: „Regional wood energy overview" was presented. The document includes information on wood products from Timber Section database, as well as information concerning energy, renewable energy, and waste obtained from the International Energy Agency (IEA) database.