Modeling of Production Plan and Scheduling of Manufacturing Process for a Plastic Industry in Nigeria

Abstract

In this work, production plan was developed for a plastic company with two products that are made up of five parts.  The production inputs for each part were analyzed and established. The production constraints in terms of materials available, machine capacities, time and labour were used to develop an integer linear programming model to achieve the objective function. The integer linear program was then used to find the optimum quantities of each part that will yield maximum profit. The developed model was analyzed with TORA optimization solver to obtain results for different constraints. The optimum solution for the LP model gave a monthly production profit of N3,751,922. Further sensitivity analyses performed for different production conditions gave results that are not feasible and the ones that were feasible were not optimal. A decision support system was developed for production planning to help the manager in scheduling decision process. The model is now been used at EagleHeights Plastic Industries Limited for their production planning.

Keywords: Production Plan, Optimum, Linear Program, Constraints, Sensitivity Analysis, TORA