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Optimising high speed coating processes. / Jurgen Eckermann

Swansea University Author: Jurgen Eckermann

Abstract

The coil coating process of strip steel is a continuous and highly automated process in which the aim is to apply a paint layer of uniform thickness onto metal sheet at high operational speed. However, the performance of the coil coating process has been limited due to the occurrence of coating defe...

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Published: 2012
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
URI: https://cronfa.swan.ac.uk/Record/cronfa42471
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first_indexed 2018-08-02T18:54:47Z
last_indexed 2018-08-03T10:10:14Z
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spelling 2018-08-02T16:24:29.3689903 v2 42471 2018-08-02 Optimising high speed coating processes. cbe4a101fd7f0c47de7db453ba46d10e NULL Jurgen Eckermann Jurgen Eckermann true true 2018-08-02 The coil coating process of strip steel is a continuous and highly automated process in which the aim is to apply a paint layer of uniform thickness onto metal sheet at high operational speed. However, the performance of the coil coating process has been limited due to the occurrence of coating defects, such as ribbing and fat edges, which leads ultimately to a reduction in the operational speed of coating. Therefore, in order to enhance coating productivity, the complex flow behaviour of commercial paints needs to be fully understood. Consequently, the main objective of this work was to obtain rheological parameters for the commercial paints using rotational Rheometers, Capillary Break-up Rheometer and Capillary Extrusion Rheometer to allow the characterisation of the complex flow behaviour. This research project was tailored over its course to generate a solid knowledge foundation of the rheological properties of polyester resin based paints prior to the defining of different experimental procedures so as to guarantee the reproducibility of the data measured with various Rheometers. Once these rheological characteristics were fully understood for one paint, the project was moved forward by selecting other commercially available paints which were similarly analysed to allow a comparison of the various rheological behaviours. One key finding was that the commercial paints behaved in either a Newtonian or a Non Newtonian fashion. The Non Newtonian paints possessed a high internal microstructure which was reflected in the degree of elasticity exhibited, whereas the Newtonian paint did not seem to exhibit any elasticity. Furthermore, a mutual, ideal operability window for the Capillary Break up Rheometer could be derived from data which was systematically collected by varying the input parameters including opening time, stretch profile and Hencky strain. Capillary Extrusion Rheometer provided extensional and shear information at very high strain rates. At the end, a steady state flow curve for both shear and extensional viscosity could be determined for a strain rate range of 10-1 to 5 x 104, which is unique for the polyester resin based paints analysed in this work. E-Thesis Materials science. 31 12 2012 2012-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral EngD 2018-08-02T16:24:29.3689903 2018-08-02T16:24:29.3689903 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Jurgen Eckermann NULL 1 0042471-02082018162457.pdf 10798179.pdf 2018-08-02T16:24:57.1070000 Output 30367097 application/pdf E-Thesis true 2018-08-02T16:24:57.1070000 false
title Optimising high speed coating processes.
spellingShingle Optimising high speed coating processes.
Jurgen Eckermann
title_short Optimising high speed coating processes.
title_full Optimising high speed coating processes.
title_fullStr Optimising high speed coating processes.
title_full_unstemmed Optimising high speed coating processes.
title_sort Optimising high speed coating processes.
author_id_str_mv cbe4a101fd7f0c47de7db453ba46d10e
author_id_fullname_str_mv cbe4a101fd7f0c47de7db453ba46d10e_***_Jurgen Eckermann
author Jurgen Eckermann
author2 Jurgen Eckermann
format E-Thesis
publishDate 2012
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The coil coating process of strip steel is a continuous and highly automated process in which the aim is to apply a paint layer of uniform thickness onto metal sheet at high operational speed. However, the performance of the coil coating process has been limited due to the occurrence of coating defects, such as ribbing and fat edges, which leads ultimately to a reduction in the operational speed of coating. Therefore, in order to enhance coating productivity, the complex flow behaviour of commercial paints needs to be fully understood. Consequently, the main objective of this work was to obtain rheological parameters for the commercial paints using rotational Rheometers, Capillary Break-up Rheometer and Capillary Extrusion Rheometer to allow the characterisation of the complex flow behaviour. This research project was tailored over its course to generate a solid knowledge foundation of the rheological properties of polyester resin based paints prior to the defining of different experimental procedures so as to guarantee the reproducibility of the data measured with various Rheometers. Once these rheological characteristics were fully understood for one paint, the project was moved forward by selecting other commercially available paints which were similarly analysed to allow a comparison of the various rheological behaviours. One key finding was that the commercial paints behaved in either a Newtonian or a Non Newtonian fashion. The Non Newtonian paints possessed a high internal microstructure which was reflected in the degree of elasticity exhibited, whereas the Newtonian paint did not seem to exhibit any elasticity. Furthermore, a mutual, ideal operability window for the Capillary Break up Rheometer could be derived from data which was systematically collected by varying the input parameters including opening time, stretch profile and Hencky strain. Capillary Extrusion Rheometer provided extensional and shear information at very high strain rates. At the end, a steady state flow curve for both shear and extensional viscosity could be determined for a strain rate range of 10-1 to 5 x 104, which is unique for the polyester resin based paints analysed in this work.
published_date 2012-12-31T03:53:02Z
_version_ 1763752628329644032
score 11.013799

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