Modeling of Linear and Non-linear Compression Processes of Sunflower Bulk Oilseeds

Abstract

The present study aimed at describing the experimental and theoretical force-deformation curves of sunflower bulk oilseeds at varying initial pressing heights and vessel diameters as well as determining the theoretical pressure and energy along the screw press FL 200 pressing chambers. The design of efficient oil expression systems for industry and small-scale application remains a major challenge to engineers and researchers. In attempting to solve the problem, it is important to understand the linear compression process and to transfer the knowledge to the industry involving mechanical screw presses. The universal compression testing machine at a preset load of 200 kN and a speed of 5 mm·min −1 , tangent curve model and the screw press FL 200 geometry parameters were applied. The obtained results of pressure and energy along the screw pressing chambers (1-7) ranged from 0.31 to 101.653 MPa and 12.616 to 1231.228 J. Applying the tangent model at n = 1 and n = 2, the cumulative pressure decreased with increasing vessel diameters while energy increased. The study provides useful information for the analysis of other bulk oilseeds and optimizing the processing parameters of screw press FL 200 and the design and development of new oil presses. 116 geometry (m 2 ). The theoretical pressure and energy at the screw lamella positions (from 0-7) were 117 determined using Equations (8)-(11). Both the experimental and theoretical data were statistically 118 analyzed using MathCAD software, version 15 and STATISITCA, version 13 [41,42].

Investigation of Heating and Freezing Pretreatments on Mechanical, Chemical and Spectral Properties of Bulk Sunflower Seeds and Oil

“…The study is part of the continuing research on linear compression modeling of all processing factors, where the results are intended to be applied to the non-linear process to improve the oil extraction process. Therefore, this intention requires a further extension of the present study by taking into account varying vessel diameters and pressing heights of the sunflower seeds at a maximum compression force and speed without the serration effect on the force-deformation curve at temperatures of 80 • C and −2 • C. Finally, the data would be used to predict the pressure and energy requirements of sunflower oil extraction along the pressing chambers of the mechanical screw press based on the tangent curve model and screw configuration parameters [67,68] to fully understand the effects of heating and freezing pretreatment processes on oil production and quality from oil-bearing crops.…”

“…The smooth and serrated patterns on the force and deformation curve with maximum oil recovery and energy demand can fully be understood. This information can be further transferred into the mechanical pressing process by applying the tangent curve model and press configuration parameters to theoretically predict the force, pressure and energy along the screw pressing chambers [67,68].…”

New approach for the elucidation of the phenomena involved in the operation of vegetable oil extraction presses

“…Unfortunately, the experimental work carried out during her thesis did not go as far as using this relationship. Kabutey et al (2019) presented a slightly different approach where material characterization is done by measuring the energy required for compression by attempting to relate measurements made on a piston press to the operation of a Farmet FL200 screw press. Based on measurements made with this piston press, where they varied the diameter and the filling level as well as the dimensional characteristics of the screw, they were able to calculate a range of predictive pressure values without being able to validate these theoretical values by experiment.…”

“…Following Bogaert (2017) and Kabutey et al (2019), we believe that it is necessary to consider the parameters influencing the rheology of the oleaginous material in the dimension "compressibility" to allow a more homogeneous, predictable, and reproducible account of the essence of the behavior of the matrices in presses. Indeed, this concept of compressibility is probably the result of several factors such as the resistance of cell walls to deformation and rupture, as well as the flow of oil that depends on its viscosity and the permeability of the cake, which in turn may depend on the pressure that by causing the collapse of the capillary network can paradoxically block the oil in the solid (Ward, 1976).…”

Research on mechanical‐structure properties during sunflower seed extrusion‐oil extraction

“…And the deformation curve characteristics and the experimental and theoretical force‐deformation curves of sunflower seeds are studied. Then the tangent curve mathematical model is used to represent the mechanical behavior of sunflower bulk seeds (Divisova et al., 2014; Kabutey et al., 2019; Sigalingging et al., 2015). The research direction of these oilseed crops is mainly focused on multi‐particle bulk seeds, with less research on individual particles.…”