By E. Morgan
Offers an absolutely illustrated and useful consultant to present commercial perform within the creation, processing and use of tinplate with particular emphasis on its relevance to the packaging undefined. Written essentially to supply the technician and apprentice with a legitimate operating wisdom of the undefined, it offers, for the 1st time in a single concise quantity, a simply understandable account of all of the significant features of the topic. contains updated information of contemporary gear and plant, business techniques, conversion suggestions, restoration tools, and examines attainable destiny advancements.
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Additional info for Tinplate & Modern Canmaking Technology
Sample text
Generally a sample is taken at this stage for confirmatory analysis and precise classification and some deoxidants are added. Casting ("teeming") is effected by running liquid steel at a controlled rate and temperature into moulds of appropriate shape; methods of teeming practised, are shown in Fig. 1. The moulds are usually made from cast iron and will have been cleaned and dressed internally before use so as to minimize surface faults. Ingot weights will vary according to the equipment available, and can be in excess of 20 tonnes.
Thus smaller diameter rolls allow a greater reduction in thickness before roll flattening becomes excessive — hence the optimum system will be small diameter working rolls which will be adequately supported against deflection by heavy back-up rolls. It also demonstrates that the higher the friction, the greater will the rolling load need to be. The technology of hot rolling and mill design have been improved substantially over the last 20 years or so. A review by Keefe (17) of the improvements made up to 1979 and the range in mill designs in use provides a comprehensive picture of these developments; it covers methods of improved shape control, gauging equipment, thickness control and better roll wear, higher mill loading and greater speeds and several other aspects.
Experience has shown this also to be an effective means of improving "shape" quality. Many devices for reducing variability in gauge have been in use for some years, with varying success; there is little doubt that gauge uniformity has been considerably improved in recent years by the use of automatic gauge control (AGC) units. The Davy-Loewy hydraulic AGC system, for which considerable success seems to have been achieved, is described in detail by Dendle(27) with examples of its effectiveness in reducing gauge variability.