PERANCANGAN KEBIJAKAN INVENTORI GUDANG PACKAGING MATERIAL DENGAN MEMPERTIMBANGKAN KAPASITAS GUDANG DI PT MAKMUR ARTHA SEJATERA

• Main Author: Raihan, Hilmy
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80843
• Institution: Institut Teknologi Bandung

PT Makmur Artha Sejahtera (PT MAS) is a manufacturing company specialized in the production of variety of jelly and fruit flavored beverages. That operates a distribution network that extend across both domestic and international markets with a make-to-stock system. As a business under the category of FMCG, PT MAS experiences high fluctuations following their consumer demand trends. The volatility of demand makesit challenging for PT MAS to perform forecast and determine an appropriate inventory management policy, leading overstock of packaging material warehouse areas. Among other materials, the cup and box category significantly contribute to the stockpiling and use of warehouse capacity. The existing forecasting model policies and inventory policies cannot accommodate actual demand patterns. Therefore, there is a need of an alternative forecasting model and inventory policy that aligns with the warehouse capacity while minimizing the total cost of inventory. The added forecasting models include MA, WMA, and ARIMA models with each item able to select the most accurate model based on the MSE score. The inventory policy design is determined using a probabilistic inventory model with the addition of incorporating warehouse capacity constraints. The policy is developed based on the characteristics of the current policy, resulting in a Q model approach and a P multi-item model. The Q model allows non-simultaneous ordering of item in accordance with their respective reorder point, in contrast with the P multi-item model mandates that each item within the same packaging material category to be order simultaneously. The best model is determined based on which achieved the minimum total inventory cost and the warehouse capacity constraints. The solution indicates the selection of P multi-item model for both the cup and box items with reorder interval of 11 days and 6 days respectively, which results in an expected total inventory cost of Rp877,100,256.00 and Rp1,747,096,214.00. In implementation, the monitoring process must be conducted extensively and with measurable outcomes. Furthermore, activities should also be done on a regular basis with at least once every three months considering that the solution is sensitive to demand parameters, percent of storage cost, item price, and order cost.