This degree project was performed at Sherwin-Williams in Märsta, Sweden over a period of ten weeks. The purpose of the work was to optimize the manufacturing process of heavy fillers due to a problem with achieving consistent quality. An optimization of the process would lead to a larger produced volume and thus increased sales. This would also help provide a better insight in all the parts of the manufacturing process. The company uses an index called OTMIS that describes how many of the products that are approved in the quality control directly after being manufactured. A higher OTMIS-index would result in a lowered total process time as it would lead to fewer time-consuming adjustments of non-approved filler batches. The work is based on a literature study and lectures in filler production to gain a basic understanding of how the production works. Daily observations of the manufacturing process led to the design of experiments being made for own laboratory tests. The purpose of these tests was to identify the parameters that had the greatest impact on the properties of the filler and how these should be controlled. Using the MODDE software, the key variables and their impact on the filler’s final quality and utility could be found and optimized. The time between the completion of the manufacturing process and the quality control, and how much variation there was in the amount of filling material used to give the filler the correct rheology proved to have the greatest impact on the results. After developing an analysis of possible sources of errors and how much they affected the result, a plan of solutions was submitted for continued improvement work. The proposals in this plan focus on lowering the average process time by introducing new routines for control, changing the manufacturing process as per the filling material’s effect, improved documentation of the manufacturing process and striving for a longer term planning process prior to manufacturing.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-325043 |
| Date | January 2017 |
| Creators | Ögger, Julius, Ströberg, Viktor |
| Publisher | Uppsala universitet, Industriell teknik, Uppsala universitet, Industriell teknik |
| 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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