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Sirvi Autor "Mizera, Č." järgi

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  • Pisipilt
    Kirje
    Extraction of oil from rapeseed using duo screw press
    (2018) Mizera, Č.; Herák, D.; Hrabě, P.; Kabutey, A.
    This study was focused on the analysis of optimize the pressing process of rapeseeds ( B rassica napus L.) using screw press. For pressing of oil a screw press Farmer 20 – duo (Farmer 20, Farmet a.s., Ceska Skalice, Czech republic) was used. The screw rotation speed 10, 20, 30, 40, 55 and 65 rpm was used. Oil recovery efficiency and specific mechanical energy were decreased when the seed material troughput was increased. It has been found that the optimal operation point for screw press Farmer 20 – duo was at 20 kg h - 1 rapeseed throughput. The specific mechanical energy at the optimal operation point was 0.61 kWh kg oil - 1 Maximum oil recovery efficiency 82.6% was found at the lowest screw speed.
  • Pisipilt
    Kirje
    Linear pressing of coconut copra meal (Cocos nucifera L.) under different temperatures
    (2019) Mizera, Č.; Herák, D.; Hrabě, P.; Saller, T.
    Pressing of vegetable oils plays an important role in the food processing. This study described the compression behaviour of copra (Cocos nucifera L.) using the universal compression testing machine and vessel diameter of 60 mm with a plunger. The influence of heat treatment on oil recovery efficiency and specific mechanical energy were determined. Compression tests at the rate of 1 mm s −1 under five different temperatures 20, 40, 60, 80 and 100 °C were performed. The measuring range of force was between 0 kN and 50 kN. It has been found that the amount of obtained oil increased and specific mechanical energy decreased with increased temperature. Measured data were analysed by computer software Mathcad 14 (MathCAD 14, PTC Software, Needham, MA, USA). Mathematical model describing the mechanical behaviour of bulk copra under compression loading was represented.
  • Pisipilt
    Kirje
    Mechanical behaviour of Sugar palm (Arenga pinnata) fibres
    (2018) Hrabě, P.; Mizera, Č.; Herák, D.; Kabutey, A.
    The tensile strength of Sugar palm ( Arenga pinnata ) fibres was examined. Fibre samples were prepared and tested up to the point of rupture with a deformation rate of 0.05 min - 1 . The tensile device (Labortech, MPTest 5.050, Czech Republic) were used to determine the tensile force. The aim of the paper was to describe a mechanical behaviour of Sugar palm ( Arenga pinnata ) fibres. Measured values can be used as a basis for further research on the application of Sugar palm fibres.