“…The plants convert the raw material to the final products while distributing them to the customers is performed by the distribution centres. A supply chain is called closed‐loop supply chain (see Cheraghalipour, Paydar, & Hajiaghaei‐Keshteli, 2018; Ma & Li, 2017; Özceylan & Paksoy, 2013; Wanke, Azad, Barros, & Hadi‐Vencheh, 2016) when there is a backward flow of products between customers (last stage) and the previous stages of the supply chain, otherwise it is called forward supply chain (see Hadi‐Vencheh, Wanke, Jamshidi, & Chen, 2018; Sanei, Mahmoodirad, Niroomand, Jamalian, & Gelareh, 2017). In order to design a supply chain network, two classical optimization problems of location and allocation problems are combined to form the supply chain network design problem.…”