Abstract:
The independent study is focused on a study about improving prefabricated wood forms concrete slabs process efficiency using a value stream mapping analysis: a case study of AAA Company limited. The objective is to study production processes and eliminate waste for improving prefabricated wood forms concrete slabs process efficiency. Then, the result showed that the actual production process include 17 activities in 715.30 minutes. The process can be categorized into 3 groups. (1) The process is the value added activities which consisted of 9 activities in 385.46 minutes with a contribution of 53.92% of the production process. (2) The process is the non-value added activities which consisted of 3 activities in 150.30 minutes with a contribution of 21.03% of the production process. (3) The process is the necessary but non-value added activities which consisted of 5 activities in 179.14 minutes with a contribution 25.05 of the production process.
The analysis of value stream mapping and ECRS concept were able to decrease production time by deleting preparation material activities (11.33 minutes) and moving prefabricated wood forms concrete slabs activities (72.07 minutes). And reduced the time of made the wooden frame activities 37.43 minutes. Including, added the time of cleaning and storage equipment activities 5.54 minutes and moving prefabricated wood forms concrete slabs activities 10.33 minutes.
By comparison, prefabricated wood forms concrete slabs production process using a value stream mapping of the current state and the future state analyze for one batch, AAA Company limited can produce 15.00 square meters or 60 pieces per one batch in 715.30 minutes. After improved the production process, it can reduce the time of production process 104.56 minutes or 14.67% per one batch. Its meant the production time was reduced to 610.34 minutes and AAA Company limited can produce prefabricated wood forms concrete slabs up to 17.50 square meters or 70 pieces per one batch (Expand lot size). AAA company limited has 200 batch per year and sells prefabricated wood forms concrete slabs is 600 Baht per square meters, with the income increase from 1,800,000 Baht to 2,100,000 Baht per year, which means that AAA company limited receives an additional income of 300,000 Baht per year or 16.67%