1. Materials and processes for metal packaging
Metal packaging has been used in the canning industry since the early 19th century (see box). However, before tackling the specific field of organic coatings, it would be useful to present the technical context and therefore the various types of metallic materials, as well as the forming and assembly processes used in the food industry.
1.1 Metals
Two main families are used: steel (tinplate or chromium-plated iron) and aluminum.
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Packaging steels
These are cold-rolled mild steels (thickness 0.12 to 0.49 mm) coated with tin (from 1 to 15 g/m 2 depending on use) for tinplate, or with chromium and chromium oxide (approx. 0.1 g/m ...
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Materials and processes for metal packaging
Varnish composition and characteristics
Economic data
For France, the values are as follows:
— cans for preserves and beverages 7 billion cans/year
— metal used 600,000 tonnes/year
— varnishes and coatings 25,000 tonnes/year
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