Journal of Industrial Technology Buriram Rajabhat University

Increasing Efficiency of Production Line By Innovation Lean Production Techniques : A Case Study of Sewing Trousers Process

2026-05-30T21:04:21+07:00

This study aimed to examine the production process of A Case Study of Sewing Trousers Process at where waste, excessive processing time, and redundant operations were identified, leading to high costs and low efficiency. Data on work procedures, distances, and processing times were collected, with root causes analyzed using a Fishbone Diagram and the 5W1H technique. The ECRS principles combined with a Flow Process Chart FPC were then applied to improve and compare the process before and after implementation. The results showed reductions from 20 to 16 steps 20%, from 56 to 43 meters in movement distance 23.21%, and from 2,804to 2,491 seconds in processing time 11.17%. These findings highlight a clear improvement in production efficiency. In conclusion, the integration of Fishbone Diagram, 5W1H, and ECRS with FPC effectively minimized waste and enhanced efficiency, offering a practical approach applicable to other manufacturing industries in the future.

Development of a Hydraulic Press-Based Flat Steel Bar Cutting System

2026-05-30T21:05:43+07:00

The aim of this research is to overcome the problem of delay and non-uniform quality in the cutting of flat steel bars by hydraulic press, due to the inefficient traditional process of feeding the steel bar to the hydraulic press. So a conveyor rail system to convey flat steel bars along with the hydraulic press was developed and designed to boost the cutting speed and precision. The research method was to build a prototype for the conveyor rail system and test it to see the difference in cutting performance between the conveyor rail and no conveyor rail, as well as the cutting time and the accuracy of the workpieces. The experimental results indicated that the developed system could cut the cutting time of the flat steel bars with a thickness of 9 mm from 8.6 s/piece (before development) to 3.8 s/piece (after improvement), which is an improvement of 55.81% efficiency. The accuracy of the workpieces with thicknesses of 3, 6 and 9 mm and a target 150 mm, showed average size of 150.2, 150.1, and 150.2 mm, respectively, with a tolerance of up to 1 mm, and an average squareness of about 90° with a tolerance of up to 1°. In addition, the results of the process capability analysis using a computer program showed that the values of Cp (process capability index) and Cpk (process capability index adjusted for actual position) for thicknesses of 3, 6 and 9 mm were 1.85/1.39, 1.95/1.60 and 3.30/2.26 respectively, all of which are superior to the industrial standard of 1.33. The results of the research validate the developed conveyor rail system which can enhance the production efficiency, ensure quality control and can be applied in real industrial conditions.

Experimental Investigation of the Heat Transfer Performance of a Two-Phase Closed Thermosyphon under Different Inclination Angles and Filling Ratios Using Dimensionless Analysis

2026-06-08T15:29:36+07:00

The primary purpose of this paper is to find the interaction between the inclination angle and filling ratio on the performance of a two-phase closed thermosyphon as both two parameters are rarely studied together in detail so far. The tests were conducted at an inclination angle of 15°, 20° and 25° from horizontal plane and filling ratios of 60%, 70% and 80% of the evaporator volume by ethanol. A copper tube with a diameter of 22 mm and a total length of 450 mm was used in the experiment; the tube was divided into three parts; 150 mm heating section, an adiabatic section, and a cooling section. The hot fluid inlet temperatures were 55, 65 and 85 °C and the cooling water was held at 20 °C constant. The results of the two-phase closed thermosyphon performance were evaluated based on the recovered heat transfer rate, thermal resistance, and by a second evaluation from the heat transfer inside the machine. To understand the figures the Nusselt number, Rayleigh number and Jakob number were used as dimensionless parameters. Based on the experimental results, it is found that the two-phase closed thermosyphon with 70% filling ratio and inclined at 20° gives the highest heat transfer performance. The thermal resistance was the lowest under these conditions, and the heat transfer was the highest amongst other conditions tested and the theory of boiling and natural convection was in good agreement. Clearly from this study, both the inclination angle and the filling ratio influence a lot the heat transfer efficiency within the two-phase closed thermosyphon. The data obtained will be useful for further design and implementation of the waste heat recovery systems.

Development of an Electric Vehicle Prototype and a Hybrid Charging System

2026-06-12T14:21:21+07:00

This research article aims to develop of an Electric Vehicle Prototype and a Hybrid Charging System, consisting of a solar energy charging system and a residential electricity charging system, and to evaluate the performance of the developed prototype electric vehicle. The propulsion system consists of a brushless DC motor rated at 24V with a power output of 600W. The motor is powered by two 12V, 40Ah batteries connected in series to provide a 24V power supply for the electric drive system. The DC charging system utilizes one solar panel with a power rating of 85W and a current output of 3.5A. Meanwhile, the AC charging system employs an AC-to-DC voltage conversion circuit through a step-down transformer rated at 18V. The experimental results of the dual-mode charging system showed that the voltage generated from the solar panel ranged from 18–19V, with the maximum voltage of 19V recorded between 12:00–13:00, corresponding to the highest light intensity of 9,616 Lux. This resulted in a continuous increase in the battery voltage level for the electric drive system. In addition, the test of the residential electricity charging system revealed that the voltage at the terminals of the two series-connected batteries gradually increased until reaching 24 V, which corresponded to the rated voltage of the propulsion system. The research results demonstrate that the developed prototype electric vehicle with a dual-mode charging system can reduce limitations associated with power sources for electric vehicle propulsion systems and provide greater flexibility in energy management by supporting both renewable solar energy and residential electrical power sources.