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2. Varnish composition and characteristics
2.1 Definition and functions
A varnish can be defined as a macromolecular material deposited on the metal surface to form an adherent, inert, thin film (3 to 15 µm thick).
Its essential functions are to protect the metal of the packaging on its inner and outer surfaces, and also to protect the contents themselves from the potentially adverse effects of contact with metals. The varnish can also be used to facilitate the shaping of the metal (in the case of chromed iron or aluminum); it also often has an aesthetic function, helping to give a regular, attractive appearance to the inside and outside of the can.
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Varnish composition and characteristics
Varnish application
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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