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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Optimalt körsätt för pluggskruv : Identifiering av orsaker till stopp i pluggskruv samt framtagning av parametrar för optimalt körsätt

Ekros, Mika, Åkerström, Wilma January 2023 (has links)
Hallsta Paper Mill, which is a part of Holmen Paper, uses the Thermo Mechanical Pulping process to produce paper pulp. One of their process steps is a plug screw feeder that transport and compresses chips. Jams often occur in the plug screw and there is currently a lack of knowledge of how it should be operated for the highest possible production quantity. The purpose of the thesis is to identify the causes that lead to failures of the plug screw and to find an optimal way of operating it.  In order to gain a deeper understanding of the different areas covered by the study, the theory of the Thermo Mechanical Pulping process used at Holmen for production of paper pulp has been presented. Also, theory about how the chips is being processed, the plug screw and its dimensions, the improvement strategy used in the study and about maintenance.  Collecting documents was done using business systems such as IFS and WinMops and interviews were conducted. The data analysis method used were a regression analysis and a fishbone diagram. From this, optimal parameters for operating the plug screw have been developed.  From the results, an improvement proposal has been designed to create clear guidelines for operating and maintaining the screw as well as other production steps that have an impact on the screw, in order to avoid unnecessary wear and failures of the plug screw.

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