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All Journal J@TI (TEKNIK INDUSTRI) Jurnal Optimalisasi
Puspasari, Luky
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Control & Systems Engineering Industrial & Manufacturing Engineering

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PENINGKATAN EFISIENSI PERSEDIAAN WORK IN PROCESS GREEN TYRE DI PT XYZ Wijaya, Hendri; Puspasari, Luky
J@ti Undip : Jurnal Teknik Industri Vol 15, No 3 (2020): September 2020
Publisher : Departemen Teknik Industri, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.544 KB) | DOI: 10.14710/jati.15.3.189-195

Abstract

Manajemen persediaan dapat meningkatkan kemampuan perusahaan untuk menghasilkan produk tepat waktu, dengan jumlah yang tepat, serta kualitas yang sesuai standar. PT XYZ adalah perusahaan yang menghasilkan produk ban tubless. Terdapat 8 proses untuk menghasilkan ban tubeless, dan masing-masing proses menghasilkan penyimpanan work in process.  Salah satu dari work in process adalah green tyre.  PT XYZ menghadapi masalah terjadi overstock pada green tyre yang menimbulkan produk cacat. Tujuan dari studi adalah untuk menentukan jumlah produksi yang tepat untuk mengatasi permasalahan overstock. Metode yang digunakan untuk menyelesaikan permasalahan ini adalah Economic Production Quantity (EPQ). Metode EPQ terbukti dapat mengurangi biaya penyimpanan dalam satu bulan sebesar Rp 33,218,117 atau sebesar 40% dari biaya semula. Alat penyimpanan juga dapat dikurangi sebesar 34%, serta luas area penyimpanan dapat dikurangi sebesar 14%. AbstractInventory management can increase a company's ability to produce products on time, with the correct amount and meet the quality standard.  PT XYZ is a company that produces tubeless tyres. There are eight processes to produce the tubeless tyre, and each process results a work in process inventory. One of the process is a green tyre.  PT XYZ faces the overstock of green tyre that raises the amount of the defect.  The aim of this study was to determine the amount of production appropriately to avoid the overstock problem. Economic Production Quantity (EPQ) method was used to solve this problem. EPQ method decreased the inventory cost as much as IDR 33,218,117 or 40% of the existing inventory cost, and reduced storage tools of 34% and reduced the storage area of 14 %.Keywords: work in process; inventory; green tyre; overstock; eqonomic production quantity
Evaluasi Pengendalian Persediaan WIP dengan Metode Production Order Quantity (POQ) di Perusahaan Manufaktur Ban Puspasari, Luky; Hasibuan, Sawarni
Jurnal Optimalisasi Vol 10, No 2 (2024): Oktober
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jopt.v10i2.10105

Abstract

The inventory system throughout the supply chain network must be effectively controlled, making Work in Process (WIP) inventory control essential. In tire manufacturing, Green Tire inventory holds the highest WIP value and is consistently maintained. However, inconsistent order quantities have resulted in uncontrolled inventory levels, leading to overstock in the storage area. This study aims to analyze the priority categories of Green Tire inventory, evaluate the optimal order quantities, and compare total inventory costs to minimize the overall cost. The methods used include ABC Analysis and Production Order Quantity (POQ) with safety stock, applying service levels of 93%, 90%, and 80% for A, B, and C categories, respectively. The findings indicate that Green Tire inventory class A accounts for 65% of the volume and 67% of the total inventory value, class B for 23% of the volume and 28% of the value, and class C for 11.9% of the volume and 5% of the value. Implementing the POQ method standardizes order quantities across rim codes, reducing maximum inventory levels by up to 69.38%. Total storage cost savings reached 66.15%, with only a 0.2% increase in setup costs. The POQ method achieved total inventory cost savings of 52.37% for Green Tire inventory.
Co-Authors Ali Djamhuri Sawarni Hasibuan