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The removal and collection of dust particles from the air discharged into the atmosphere by industrial plants processing, transporting and storing dusty materials is an important objective for employers to prevent air pollution according to environmental legislation and employee safety regulations. Where the dust in question is flammable and may generate an explosive atmosphere, measures must be taken to prevent explosion and/or limit the effects of explosion. To this end, proper assessment of the risk of explosions is essential in order to determine the effectiveness of the measures implemented and/or the need to take additional measures. As there is no specific assessment method for the risk of explosions in dust/air explosive atmospheres, various bodies/persons have developed their own more or less comprehensive assessment methods. In the paper are presented some important aspects included in the assessment procedure applied by us for the evaluation of the risk of explosions in dust removal systems with emphasis on the development of laboratory tests to determine the explosive characteristics of explosive air/flammable dust mixtures as well as on the constructive solutions to limit the effects of possible explosions. It highlights the importance of the competence of persons involved in the design, installation, maintenance and inspection of installations regarding the application of standards, guidelines and legislation in the field. [ABSTRACT FROM AUTHOR]

Processing the waste paper produces huge amounts of waste - papermaking sludge. This kind of waste includes around 50 % of inorganic material and high proportion of water. Its current economic recovery is very limited, which affects the overall efficiency of recycling paper. However, the elementary and chemical composition has a high potential for wider and more economically efficient use in various industrial fields. The object of this paper is research of composition and physical properties of such sludge from old paper recycling. The work analyzes the possibilities of the sludge material recovery and aims to develop a new product for the construction industry - building plates with different physical properties and their areas of application. Realized experimental research has shown high potential of material recovery of this waste. Research results show that the new product developed on the basis of the papermaking sludge achieves excellent mechanical properties. Thanks to this way, the material recovery of sludge from old paper recycling obtains not only economically efficient new product but also environmental benefits. [ABSTRACT FROM AUTHOR]

The paper is focused on the possibility of creation teaching aids with using colour 3D printers. The main emphasis will be given to MCOR IRIS HD printing machine. The usage of teaching aids and models representing the real phenomenon is quite useful in many scientific spheres. Nowadays we can achieve these models in various ways from the classic machine-tools to modern 3D printers which became very popular. The technology of MCOR IRIS is one of the latest in the field of the 3D printing. The printer uses ordinary white or printed papers as its printing material. Paper sheets are glued and cut by the special knife. This technology allows the production of fully coloured and relatively cheap models. There are still several limits such as sharp edges or the duration of the building process which can destroy the results. On the other hand, the printer is easily able to build a lot of different models (including tactile maps, houses, volcanos) in comparatively good quality and short time. The paper discusses the strength and weakness of mentioned technology focusing on data accessibility and models preparation. The main benefit is an easy and accessible creation of models for the scientific researchers and exhibitions. [ABSTRACT FROM AUTHOR]