Control of Plastic Packaging Raw Material Inventory Using Economic Order Quantity with Disruptions (EOQD) at PT X

Abstract

The supply chain is a system that involves all entities necessary to transform raw materials into finished products, consisting of several stages such as suppliers, manufacturers, distributors, wholesalers, and retailers. In most cases, the supply chain is always faced with uncertainty. One type of supply chain uncertainty that has gained attention over the past decade is supply disruption, such as that resulting from customs delays, supplier uncertainty, labor strikes, epidemics, and natural disasters. Major studies on supply disruption began in the early 1990s, along with efforts to incorporate supply disruption into classic inventory models. PT. X Industri is a company engaged in the plastic materials industry. One of the products manufactured by the company is plastic packaging bottles. In producing plastic packaging bottles, the basic material used is Polyethylene Terephthalate (PET) and the product uses a bottle cap as a closure. PT. X often experiences a shortage of raw materials for bottle caps for packaging the plastic bottles that have been produced. This study uses EOQD calculations for its resolution. The calculation results obtained a dry period probability with a coefficient value of 0.289 and a dry period cycle of 2, which indicates that PT. X will experience a 2-day stockout of bottle cap materials. When the company experiences a stockout, there will be additional costs incurred by the company for its production cycle amounting to IDR 87,933,868.