Department of Agrotechnology, University of Tehran, College of Aburaihan, Tehran, Iran
Department Agrotechnology, University of Tehran, College of Aburaihan, Tehran, Iran
Post-harvest operations have been used in order to increase the efficiency of product production. In the case of walnuts, one of the important processes for improving quality is peeling the walnut’ s shell. Because of the amount of walnuts produced in Iran and the necessity to reduce the loss of products, a device for quick removal of the walnut’ s shell is needed. This study examined and compared the different types of peeler machines, interior and exterior designs and also miscellaneous patents. Based on existing literature and to the needs of domestic consumers, we determined the important criteria and designed an improved machine for peeling walnuts.