Technical feasibility of using infrared radiation in dry-peeling for hazelnuts

Document Type : Research Paper


1 Abureyhan Campus

2 Department of Agro-Technology Engineering, College of Aburaihan, University of Tehran, Tehran, Iran

3 2Master of Science student, Department of Agro-Technology Engineering, College of Aburaihan, University of Tehran, Tehran


In this study, removal of the brown skin (seed coat) on the hazelnut kernel was investigated using infrared radiation. Evaluation of the infrared radiation method to achieve the highest percentage of seed coat loosening on the kernel. The effects of infrared emitter power at three levels of 800, 1200 and 1600 W, radiation duration at three levels of 2, 3 and 4 minutes, and the initial moisture content of hazelnuts at four levels of 4, 6, 8, and 10% wet basis (w.b.) were investigated. Experiments were conducted at factorial in a completely randomized design with three replications. The peel loosening percentage was determined with using image processing method The results showed that by increasing in the IR radiation power and radiation time increased the percentage skin loosening significantly (p < 0.05), while the increase of moisture content hazelnuts was caused reduced the percentage skin loosening (p < 0.05). The most appropriate parameters the IR radiation unit were determined to be radiation power at 1600 W, the radiation time 3 min, and the moisture content of hazelnut 4% (w.b.).


Main Subjects

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