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E-Thesis 368 views

Process And Materials Effect In Organic Coating Of Architectural Steels / SARA MUGABO

Swansea University Author: SARA MUGABO

  • E-Thesis – open access under embargo until: 30th October 2025

DOI (Published version): 10.23889/SUthesis.58522

Abstract

Coil roll coating is an industrially mature process to produce pre-coated steels at high speeds.30% sales by revenue for Tata steel colors, UK is attributed to the manufacture of architectural steels which is primarily used for composite panels for cladding systems. A research programme has been car...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Jewell, Eifion
URI: https://cronfa.swan.ac.uk/Record/cronfa58522
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first_indexed 2021-11-01T14:50:39Z
last_indexed 2022-03-30T03:25:39Z
id cronfa58522
recordtype RisThesis
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spelling 2022-03-29T10:44:19.0937648 v2 58522 2021-11-01 Process And Materials Effect In Organic Coating Of Architectural Steels 4bc1d778b4bfd469c556da408f511dbc SARA MUGABO SARA MUGABO true false 2021-11-01 Coil roll coating is an industrially mature process to produce pre-coated steels at high speeds.30% sales by revenue for Tata steel colors, UK is attributed to the manufacture of architectural steels which is primarily used for composite panels for cladding systems. A research programme has been carried out which has examined the mechanisms by which the coating is picked up from the coating trough by the roll, with a reference to a defect where an insufficient coating is transferred leading to a defect named paint misses (PMD). A comprehensive study of a pair of coatings, one which demonstrated PMD and one which did not identify that their performance difference could be attributed to differences in rheology. The coating extensional viscosity and elasticity were identified as indicators of the behaviour. The identification of these primary rheological characteristics was corroborated through a blind test of a further pair of coatings where PMD had been observed on the coating line. The ability of the pickup roller to pull the coating from the trough and apparent wall slip (AWS) near the surface were identified as the dominant mechanisms. These mechanisms were also identified in a laboratory-scale simulation of the pickup cylinder rotating in the coating trough. Model PVC coatings were manufactured where the pigment concentration and solvent level was varied independently to develop the further underlying relationship between material rheology and coating pick up. The Mooney analysis method used to examine the slip behaviour was found to be inadequate for describing the behaviour of the liquid coatings. The deviation between idealised and real behaviour increased as polymer and pigment mass fraction increased. The quantity of coating picked up by the roll was found to be difficult to measure accurately due to the presence of the ribbing phenomena, which was particularly evident on the commercial coating systems. Additionally, liquid coating pickup tended to reduce with roll speeds and decreased with increasing pigment fraction (and hence viscosity). The study recommends an updated Quality Control (QC) system for checking the liquid coatings prior to being introduced to the process coating line. E-Thesis Swansea Rollercoating process, Paint rheology, Paint misses, Plastisol-based coatings, Chemical analysis, Apparent Wall slip, Mooney analysis 1 11 2021 2021-11-01 10.23889/SUthesis.58522 COLLEGE NANME COLLEGE CODE Swansea University Jewell, Eifion Doctoral EngD EPSRC doctoral training grant 2022-03-29T10:44:19.0937648 2021-11-01T14:46:58.7663083 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised SARA MUGABO 1 Under embargo Under embargo 2021-11-01T14:58:36.1521597 Output 10611210 application/pdf E-Thesis – open access true 2025-10-30T00:00:00.0000000 Copyright: The author, Sara Lairah Mugabo, 2020. true eng
title Process And Materials Effect In Organic Coating Of Architectural Steels
spellingShingle Process And Materials Effect In Organic Coating Of Architectural Steels
SARA MUGABO
title_short Process And Materials Effect In Organic Coating Of Architectural Steels
title_full Process And Materials Effect In Organic Coating Of Architectural Steels
title_fullStr Process And Materials Effect In Organic Coating Of Architectural Steels
title_full_unstemmed Process And Materials Effect In Organic Coating Of Architectural Steels
title_sort Process And Materials Effect In Organic Coating Of Architectural Steels
author_id_str_mv 4bc1d778b4bfd469c556da408f511dbc
author_id_fullname_str_mv 4bc1d778b4bfd469c556da408f511dbc_***_SARA MUGABO
author SARA MUGABO
author2 SARA MUGABO
format E-Thesis
publishDate 2021
institution Swansea University
doi_str_mv 10.23889/SUthesis.58522
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 0
active_str 0
description Coil roll coating is an industrially mature process to produce pre-coated steels at high speeds.30% sales by revenue for Tata steel colors, UK is attributed to the manufacture of architectural steels which is primarily used for composite panels for cladding systems. A research programme has been carried out which has examined the mechanisms by which the coating is picked up from the coating trough by the roll, with a reference to a defect where an insufficient coating is transferred leading to a defect named paint misses (PMD). A comprehensive study of a pair of coatings, one which demonstrated PMD and one which did not identify that their performance difference could be attributed to differences in rheology. The coating extensional viscosity and elasticity were identified as indicators of the behaviour. The identification of these primary rheological characteristics was corroborated through a blind test of a further pair of coatings where PMD had been observed on the coating line. The ability of the pickup roller to pull the coating from the trough and apparent wall slip (AWS) near the surface were identified as the dominant mechanisms. These mechanisms were also identified in a laboratory-scale simulation of the pickup cylinder rotating in the coating trough. Model PVC coatings were manufactured where the pigment concentration and solvent level was varied independently to develop the further underlying relationship between material rheology and coating pick up. The Mooney analysis method used to examine the slip behaviour was found to be inadequate for describing the behaviour of the liquid coatings. The deviation between idealised and real behaviour increased as polymer and pigment mass fraction increased. The quantity of coating picked up by the roll was found to be difficult to measure accurately due to the presence of the ribbing phenomena, which was particularly evident on the commercial coating systems. Additionally, liquid coating pickup tended to reduce with roll speeds and decreased with increasing pigment fraction (and hence viscosity). The study recommends an updated Quality Control (QC) system for checking the liquid coatings prior to being introduced to the process coating line.
published_date 2021-11-01T04:15:07Z
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score 11.037603

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