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Title: Detinning and the development of the two piece food can
Author: Williams, I. M.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2004
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Within the can-making industry there has been a general move from 3-piece cans towards their 2-piece cousins. The majority of this movement has occurred in the beer and beverage sector where virtually all cans are of the 2-piece drawn and wall-ironed variety. This trend has also encroached on the food sector. Where typically a plain 3-piece can was used for packaging foods such as pears, pineapples and tomato products, now a semi-lacquered 2-piece can has started to be used. This work investigates the corrosion mechanisms of these cans using the Scanning Vibrating Electrode Technique (SVET). No previous SVET work detailing the testing of tinplate had been published. The first stage therefore was to develop a testing protocol. This involved finding a suitable electrolyte type and concentration that related to the typical contents of the cans. This was detailed in chapter 3. Following this, development of the SVET equipment was required. This took a number of forms. First an environment chamber was designed and built into the SVET testing stage. Second some further development of the surface profiling technique was carried out. This technique enabled not only the corrosion scanning of formed samples, but also scanning of uneven flat samples that otherwise would have been impossible. This work is detailed in chapter 4. Chapter 5 details the testing of flat production tinplate. A typical tinplate corrosion pattern was discovered that related to the specification of the material. Some questions that surfaced in chapter 5 relating to the SVET detection efficiency were answered in chapter 6. Also detailed in chapter 6 was work carried out on galvanised steels that could be contrasted to the tinplate results. Chapter 7 detailed studies performed on low and high tin coating weight cans. Some excellent and consistent results were achieved. It was possible to relate these results back to the canmaking processing parameters, and the small differences seen between each stage. Chapter 8 provides details of a case study. The SVET was used to predict the corrosion performance of flat tinplate and formed cans. The SVET results were compared to pack test data that showed excellent correlation between the two. Finally chapter 9 details studies in deoxygenated atmospheres. The extra detail revealed on the SVET scans showed that this might well be the direction to take for the future evaluation of tinplate using the SVET. Finally chapter 10 provides conclusions for this first body of work on the study of tinplate using the SVET.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available