Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
A Novel Feeding Mechanism for Hulling Extra-Large Confection Sunflower Seed with Shearing Rolls
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Applied Engineering in Agriculture. 32(3): 431-437. (doi: 10.13031/aea.32.11401) @2016
Authors: Harjot Sidhu, Dennis P. Wiesenborn, Sreekala Bajwa, Darrin M. Haagenson
Keywords: Confection sunflower, Extra-large sunflower seed, Germination, Hulled kernels, Planting, Sunflower kernel.
Abstract. Consumer demand for extra-large (XL) confection seed is high and increasing, but plantability of XL hybrid seed poses a challenge in terms of mechanical seed delivery limitations and an inherent decrease in germination. To alleviate these shortcomings, planting hulled kernels have been proposed; however, gently removing the hull while preserving an intact, viable embryo is necessary. The objective of this study is to improve the hulling efficiency of shearing rolls through improved seed orientation control entering the rolls. Although the strain and force at hull rupture was greater at transverse versus flat orientation, unacceptable kernel damage (>50%) was observed in seed processed in a flat orientation. A grooved extension of the feed tray, together with a 45° inclination of the rolls, accomplished transverse seed orientation entering the rolls. The combined effect of roll surface, roll inclination, pass gap configuration, and seed moisture on hulling efficiency was evaluated. The highest intact kernel yield (74%) was obtained from rubber rolls positioned at a 45° inclination, 5.8% seed moisture, and a three-pass gap configuration (0.21, 0.21, 0.14 cm distance). Controlling seed orientation significantly improved hulling efficiency and did not negatively impact viability as germination remained above 90%.
(Download PDF) (Export to EndNotes)