Artykuły (IPiP)

Stały URI dla kolekcjihttp://hdl.handle.net/11652/145

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  • Pozycja
    Effect of Humidity on Paper and Corrugated Board Strength Parameters
    (2014) Szewczyk, Włodzimierz; Głowacki, Krzysztof
    One of the main problems as regards practical utilisation of corrugated board as packaging material is reduced strength followed by the higher humidity of the fibrous materials of which corrugated board is made. Based on the results of laboratory tests, the effect of humidity on the Young’s modulus, Poison’s ratio and strength properties of fibrous materials used for corrugated and coating layers as well as on the bending stiffness and edge crush strength of corrugated board were determined. Treating fibrous materials as elastic bodies, the stiffness and edge crush strength of the board tested were calculated theoretically. A comparison between calculation and measurement results proved that it is possible to predict changes in the mechanical properties of corrugated board caused by changes in humidity provided we know the effect of humidity on basic properties of the fibrous material of which the corrugated board was made.
  • Pozycja
    Waste Treatment with Supercritical Water
    (2014) Głębowski, Michał; Szewczyk, Włodzimierz
    Waste with a high water content is particularly difficult to reprocess. Drying, required before the final burning process, consumes large amounts of energy and it is quite expensive. The paper provides an overview of the processing methods of waste generated in both the paper and related industries using supercritical water. The process is technologically advanced and requires a special design approach. The fundamentals, assumptions and conditions of the recycling process are presented. The requirements for waste feedstock and potential environmental benefits are described. This work also presents the results of tests performed on a laboratory scale using various samples from industry, and discusses the design and operation of a prototype waste utilisation line of 200 kg/h capacity. Based on the results obtained, areas of potential application for this method of waste processing in the industry are also described. Plans for the development and implementation of the process on an industrial scale are outlined.