การหานโยบายการสั่งซื้อที่เหมาะสมสำหรับวัตถุดิบเครื่องเทศและสมุนไพรอบแห้ง

Abstract

This is research to study the problem of the case study company, a spices and dried herb manufacturer as well as distributor. The company was underdoing the problem of inventory management, i.e., imbalance between the value of inventory and sales volume in some durations. Therefore, guidelines for solutions/improvement were required, with the objective to reduce the total cost of inventory management. Research implementation process started from finished product categorization based on ABC Analysis in order to categorize these products by sales volume. Then, the products were sorted out into each particular item of raw materials. Those used for manufacturing of finish products in Group A were categorized into raw materials of Group A too, because they were considered as coming from finish products with high sales volume. In case of a constant demand for raw materials in Group A, EOQ (Economic order quantity) purchase policy would be used. On the contrary, in case of an inconstant demand for raw materials in Group A, heuristic purchase policy would be used instead. In this research, 2 types of purchase policy were used for comparison, i.e., Silver – Meal and Newsboys Model. The one that could generate maximum cost reduction would be selected. As for raw materials in Group B and Group C with the small value, Two – Bin was used. After analyzing all 68 items of disbursed raw materials, followed by improvement using the appropriate ordering policy based on the data between August 2021 – July 2024, it was found that in Group A, consisting of 36 items, 31 items were managed with an Economic order quantity policy, and 5 items were managed with the Silver – Meal policy. In Groups B and C, totaling 32 items, a two-bin system policy was used. Following the improvements, the total cost was reduced from 2,399,422.23 baht to 1,528,115 baht, which is a decrease of 871,306.99 baht or a reduction of 36%.