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4. Valuation methods
The importance of coatings in the final quality of metal packaging has led to the development of numerous testing methods, both for routine production control and for the selection and development of new coatings.
4.1 Physical properties
Film thickness: an essential characteristic of the application, it is traditionally measured by weight (for example, 5 to 7 g/m 2 for a common epoxy-phenolic varnish) or electrically (the varnish is a dielectric whose capacity is a function of thickness).
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Valuation methods
Choice of protection specifications according to content
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
Bibliography
Regulations
As materials intended to come into contact with foodstuffs, varnishes must comply with the relevant regulatory requirements.
At present, we mainly take into account :
european regulations ;
French texts ;
American regulations.
European regulations
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Organization
Center technique de la conservation des produits agricoles, CTCPA.
Manufacturers
Metal packaging manufacturers
Crown Cork/Carnaud metal box
Férembal
Impress Metal Packaging SA
Massilly France
Continental Can France
Nacanco SA
Varnish manufacturers
Holden Europe
PPG Industries Packaging Coatings
...
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