Analysis of oil point threshold indicators of bulk rapeseeds and sunflower seeds under compression loading
2021
Demirel, C., Czech Univ. of Life Sciences, Prague (Czech Republic) | Herak, D., Czech Univ. of Life Sciences, Prague (Czech Republic) | Kabutey, A., Czech Univ. of Life Sciences, Prague (Czech Republic) | Dajbych, O., Czech Univ. of Life Sciences, Prague (Czech Republic)
The article evaluates the oil point parameters of samples of bulk rapeseeds and sunflower seeds under compression loading. The oil point is the region where the oil emerges from the seed kernel which requires maximum pressure to recover the maximum oil contained in the bulk seeds. The determination of the maximum pressure, however, requires both the experimental and theoretical analyses of the oil point parameters namely strain, energy, oil yield and gradient volume energy. This information is limited in the literature for bulk oilseeds such as rape and sunflower. In this present study, the oilseeds samples were measured at an initial pressing height of 80 mm in a pressing vessel of diameter 60 mm. The deformation levels of 30, 35, 40, 45 and 50 mm were tested for the lower and upper oil points at a speed of 10 mm•minE−1 using the litmus test procedure. The above-mentioned oil point indicators were calculated. The force-deformation curve of the upper oil point was theoretically described by the tangent curve model where the coefficients of the model were determined and statistically analysed to assess the accuracy of the model using the MathCAD 14 software. The study provides useful information for optimizing the mechanical oil extraction process involving screw presses.
显示更多 [+] 显示较少 [-]