By Terry A. Turner
Steel protectin, together with either steel remedies and coating platforms. gives mutual defense for either can and contents. this booklet is the first connection with meld the information of chemical businesses and canmaking businesses, overlaying fabrics and procedures utilized in either protecting and ornamental facets of steel packaging. subject matters contain simple substrates (aluminum and steel), calls for of the markets served, simple metal-forming procedures, and the categorical ornamental and protctive wishes of other packaging kinds, with emphasis supply to the applied sciences probably for use, comparable to ultraviolet curing. This useful reference provides readers a backround and familiarity with terminology and expertise and offers perception into why definite applied sciences are used over others.
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Additional resources for Canmaking: The Technology of Metal Protection and Decoration
This can normally be achieved in a single tool pack although more than one action of the press may be involved. After application of the end-lining compound gasket material, the sheet is fed into a multi-stage conversion press that forms the rivet, makes the score and attaches the tab (for simplicity the tab manufacturing process is not included in this description). The formation of the rivet is itself a multi-stage drawing operation to create initially a shallow bubble on the external surface of the end, which is then progressively converted into a more or less straight-sided protrusion 3-6 mm in diameter.
Screw caps and non-vacuum closures. These types of closure are used on a wider range of containers, including those made from metal, glass and plastic and packed with food, beverage and non-food products. The seal is achieved in a variety of ways, including cardboard, cork or plastic wads and thermoplastic compounds made from PVC, polyethylene or latex. The attachment to the container is via a thread or a lug, with the exception of crown corks which may be either threaded or crimped onto glass bottles.
The emphasis on flexibility or chemical resistance can be adjusted by the ratio of epoxy and phenolic content, the former giving flexibility and the latter chemical resistance. Epoxy-phenolic lacquers, normally gold in appearance, are used for a wide range of acidic and non-acid foods as well as non-food products. They are sometimes used in a pigmented form (aluminium powder or zinc carbonate) to mask or absorb sulphide staining. They are also the base lacquer type for meat release lacquers, in conjunction with waxes and aluminium pigmentation.