University of Twente Student Theses
Reducing the Work-In-Process inventory in a cleanroom production environment
Oerbekke, B.G. (2025) Reducing the Work-In-Process inventory in a cleanroom production environment.
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| Abstract: | VDL ETG Almelo provides solutions for the semiconductor industry. This research takes place at the Systems-2 division at VDL ETGA that has been in existence since 2019. This division is specialized in the production of customer-specific modules. The production of these modules is carried out in a cleanroom environment under strict cleanliness requirements compliant with ISO 6 standards. Materials needed for production need to be either unpacked or cleaned before entering the cleanroom. Currently, Systems-2 finds that there is too much work-in-process (WIP) inventory at the production, cleaning and unpacking area. Therefore Systems-2 want to control the WIP inventory at these areas. The unpacking and cleaning of materials before entering the cleanroom takes time and resources, therefore a just-in-time delivery is not possible. This causes a decision on how many materials must be delivered to the cleanroom at once such that there are enough materials available for production while not exceeding the capacity of the unpacking and cleaning process. This must be done while also considering different types of load-carriers, and uncertainty in the timing of demand. In this research an MIP model based on the MultiLevel Capacitated Lot-Sizing Problem will be developed that creates a policy for what materials need to be delivered at what time such that the WIP inventory can be reduced and controlled at the production area of Systems-2. |
| Item Type: | Essay (Master) |
| Clients: | VDL ETG, Almelo, Nederland |
| Faculty: | BMS: Behavioural, Management and Social Sciences |
| Subject: | 58 process technology, 85 business administration, organizational science |
| Programme: | Industrial Engineering and Management MSc (60029) |
| Link to this item: | https://purl.utwente.nl/essays/106278 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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