Polymer laminated steel is increasingly popular in the packaging industry as a competitor to lacquered steel and as a product in its own right. It does however have many benefits over lacquering such as the ability to coat before processing and absence of harmful emissions. One key requirement for such materials is good adhesion between polymer and steel. This work examines the bonding of polymer film to steel substrates in material where the adhesion is relatively good. A test method was developed which produces quantitative results for the strength of this adhesion. It was shown that this method was reproducible and differentiated between good and excellent adhesion. From the results obtained using this test method the effect of substrate and film variations were investigated using a combination of tin and chrome coated steel and polyethylene terephthalate (PET) and polypropylene (PP) polymer films. For the tin substrate it was found that the surface finish affected the adhesion of PET but there was less if any effect on PP adhesion. This was thought to be down to the failure mechanism that occurred in the PET being interfacial whereas for the PP the failure occurred within the polymer and so was not affected so much by surface characteristics. This was confirmed using surface analysis techniques. Chrome coated steel samples were also tested but results from these were less conclusive.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:639081 |
| Date | January 2004 |
| Creators | Snook, J. R. M. |
| Publisher | Swansea University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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