The transition from plastic packaging to renewable materials, a growing population and increased e-commerce, have resulted in a greater need for paper packaging. Furthermore, increasingly stringent regulations for shelf-ready packaging and food safety mean that the market, for fresh fiber-based packaging that are chemical free and have good strength and printability, is expanding. Given these trends, SCA decided in 2019 to expand the paper mill in Obbola, to be able to meet the rising demand. The planned expansion will see SCA Obbola go from operating Europe’s largest Kraftliner machine, to the world’s largest Kraftliner machine. With the new paper machine going into service, there will be an increased pressure on internal transports of products from the Obbola factory to the terminal in Holmsund, where they are stored in preparation for the onward journey to deliver them to customers. These internal transports work according to two set goals. On the one hand, it is desirable to achieve a high degree of filling in the trucks to reduce transport costs. On the other hand, one wants to avoid the trucks traveling long distances in the terminal, again in order to minimize costs. However, the current storage system is set up to optimize the terminal’s bearing surfaces rather than the resulting mileage for the trucks. SCA Logistics therefore saw a need for investigating how internal transports could be optimized, with the aim of minimizing total costs. This was the starting point of this project, which was carried out in five phases. First, a feasibility study was conducted, where the focus was on gathering information about the intended problem area. Secondly, the warehouse logistics at SCA Logistics Umeå, the terminal operated by SCA Logistics in Holmsund, were investigated by means of a thorough data analysis. In a third phase, a model was created to simulate future paper production at SCA Obbola. In a fourth phase, it was possible to simulate the flow of internal transports and design tests to investigate the outcome of different strategies. The final phase of the project included continuous verification and validation of first four phases. The results confirm the company management’s fear, that a one-sided optimization of the degree of filling will lead to long and time-consuming driving segments for the trucks. It also demonstrates that all components of the flow must be considered, in order to minimize the total costs associated with internal transports. Accordingly, this report proposes a new strategy for internal transports, which take the entire flow into account.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:umu-196208 |
| Date | January 2022 |
| Creators | Vestin, Maja |
| Publisher | Umeå universitet, Institutionen för matematik och matematisk statistik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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