Economic production quantity model with defective items, imperfect rework process, and lost sales

Chusnul  Aprilianti; Annisa Kesy Garside; Amelia  Khoidir; Thomy Eko  Saputro

doi:10.30656/jsmi.v8i1.7580

Authors

Chusnul Aprilianti Universitas Muhammadiyah Malang
Annisa Kesy Garside Universitas Muhammadiyah Malang https://orcid.org/0000-0003-1692-0277
Amelia Khoidir Universitas Muhammadiyah Malang https://orcid.org/0009-0006-8172-3455
Thomy Eko Saputro Universitas Muhammadiyah Malang

DOI:

https://doi.org/10.30656/jsmi.v8i1.7580

Keywords:

Defective items, Economic production quantity, Imperfect rework process, Inventory management, Lost sales, Production lot size

Abstract

This study proposes an economic production quantity (EPQ) model that comprehensively addresses scrap items, imperfect quality items, rework processes, and shortages. The model incorporates various types of defective items, including scrap, imperfect quality, and rework able items, and implements immediate rework processes upon the completion of regular production. Shortages are treated as lost sales, enhancing the accuracy of inventory cost estimations. Numerical experiments demonstrate the optiÂmalÂity of production lot sizes and underscore the impact of production and demand rate adjustments on overall inventory costs. Sensitivity analysis further elucidates the influence of imperfect quality items on inventory costs. This EPQ model offers a comprehensive approach to efficient and effective finished product inventory management by integrating considerÂations for scrap items, imperfect quality items, and rework processes. AddiÂtionally, a furniture manufacturing company case is presented to illustrate the practical application of the proposed model.

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