This study analyzes the influence of nonfulfillment of orders in a company that produces plastic sheets. The main cause of problems is the long unproductive times during the extrusion process, which decrease the index of the overall equipment effectiveness (OEE). An innovative proposal is presented to address this issue, involving the use of a systematic approach and combining the SMED and preventive maintenance techniques of the lean manufacturing methodology, with the aim of reducing unproductive times to improve the OEE index. To validate the effectiveness of the proposal, the systems were simulated using Arena simulation software and input analyzer, to determine the reduction of unproductive times. Results show that the proposal reduces the unproductive times bh 36.37% and improves the OEE index by 9.02%. This demonstrates the achievement of the objective of the project, which was to maximize the efficiency of the process and reduce the total time of the extrusion process, which will allow the company to fulfill the orders and avoid profit losses.