engleski

Physical and mechanical properties of sunflower seed (cv. Alexandra pr)

Various physical and mechanical properties of sunflower (Helianthus annuus cv. Alexandra) seeds and kernels were determined as a function of moisture content. The average length, width, thickness, equivalent diameter, unit mass, and sphericity of seeds were 9.61, 4.82, 3.20, 5.32 mm, 0.0524 g, and 54.24%. In the moisture range from 5.29% to 20.08% w.b., studies on the rewetted seeds showed that the bulk density of seed decreased from 416.32 to 391.05 kg/m3 and kernel increased from 533.67 to 701.69 kg/m3, respectively. The true density of seeds decreased from 648.21 to 582.66 kg m-3, while for kernel it increased from 868.30 to 1081.43 kg/m3. The porosity of seeds increased from 35.78 to 44.27%, while porosity of kernel increased from 38.53 to 46.11%. In the same moisture range, the static coefficient of friction for seeds on three different material surfaces varied from 0.421 to 0.572 on aluminium, from 0.501 to 0.811 on plywood and from 0.537 to 0.861 on rubber.

sunflower; seed; moisture; physical properties; mechanical properties

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