A closed-loop green supply chain model with product recycling: A case study of Shahpar Momtaz shoes co.

In this study, master production schedule (MPS) control and optimized inventory control are considered the main factors affecting multi-level closed-loop supply chain processes; therefore, in order to achieve the objective of supplying the demand of retailers, a model is required that determines how many jobs should be assigned to the manufacturing workshops and within what timeframe. The model must also ensure that manufacturing processes are environmentally friendly in terms of contaminant emission in order to reduce the occupational risk factors for employees. Thus, a set of criteria titled “Occupational Exposure Limits” (OEL) are defined to ensure the safety of the workforce in all production centers. These limits are intended to assess and control the occupational risk factors in workplaces. The permissible OEL of chemical substances depend on the type, definition, and specific applications. By introducing a mathematical model for LMIP¹ and optimizing it through appropriate technical, engineering and management methods, this research aims to eliminate or control the workplace pathogens with a view to minimizing the employees’ limit of exposure. The results indicate that establishing proper conditions by applying the required control measures in work environments in such a way that minimizes either the employee exposure to hazardous substances, or the concentration limit thereof, may reduce the short-term and long-term adverse health effects that exposure to such substances cause in the human body.