Download Canmaking: The Technology of Metal Protection and Decoration by Terry A. Turner PDF

By Terry A. Turner

Metal protectin, together with either steel remedies and coating platforms. offers mutual safeguard for either can and contents. this publication is the 1st connection with meld the information of chemical businesses and canmaking businesses, overlaying fabrics and approaches utilized in either protecting and ornamental elements of steel packaging. themes comprise easy substrates (aluminum and steel), calls for of the markets served, simple metal-forming tactics, and the categorical ornamental and protctive wishes of other packaging forms, with emphasis supply to the applied sciences probably for use, equivalent to ultraviolet curing. This sensible reference supplies readers a backround and familiarity with terminology and expertise and provides perception into why sure applied sciences are used over others.

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Extra resources for Canmaking: The Technology of Metal Protection and Decoration

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The latter will occur slowly and further detinning will be limited by the rate of hydrogen absorption by the steel. If the tincoating weight is too low to afford adequate protection for the underlying steel and/or there is an excess of oxygen, then corrosive failure can occur after stages I and 2 have been reached. These failures are the result of iron dissolution and hydrogen evolution, the latter giving rise to hydrogen swells: 2H+ Fe -+ Fe2+ + 2e- -+ H2 + 2e- atthe anode at the cathode Anodic dissolution ultimately may give rise to perforation and the ingress of oxygen, which greatly affects the rate of corrosion.

Both phenolic and epoxy-phenolic lacquers are prone to a phenomenon referred to as blocking and must be stored above 190-l95°C to ensure this problem, which manifests itself as incomplete cure even on repeat stovings, does not occur. Epoxy-amino resins. 4). Consequently they are used commonly for decorative purposes, where their lower stoving temperature is an additional advantage, and for internal protection ofbeverage cans. 4 are usually alkylated (commonly butylated) to varying degrees and cross-linking occurs with epoxy resin via methylol groups.

In both cases, pre-neck and fullnecking, the diameter reduction is achieved as the rotating disk is forced against the top side wall of the rotating can. 21 shows the stages in a single die-necking operation. It can be seen that diametral reduction is achieving by forcing the open end of the can through a roughly conical entry area into a tooling diameter that is smaller than the starting diameter of the can or container. 20 Spin-necking process. 21 Die-necking process. 3 4 31 COA TlNG TYPES AND THEIR USES required depends on the target diametral reduction but in modern canmaking operations it is not unusual to use eight or ten such die assemblies.

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