By Terry A. Turner
Metal protectin, together with either steel remedies and coating structures. presents mutual safeguard for either can and contents. this booklet is the 1st connection with meld the information of chemical businesses and canmaking businesses, protecting fabrics and techniques utilized in either protecting and ornamental elements of steel packaging. subject matters contain simple substrates (aluminum and steel), calls for of the markets served, simple metal-forming approaches, and the explicit ornamental and protctive wishes of alternative packaging varieties, with emphasis provide to the applied sciences probably for use, reminiscent of ultraviolet curing. This sensible reference supplies readers a backround and familiarity with terminology and know-how and provides perception into why definite applied sciences are used over others.
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Extra info for Canmaking: The Technology of Metal Protection and Decoration
Therefore it is essential that the canfiller not only rinses the filled cans thoroughly but also dries them. Specialist equipment is manufactured for drying cans and it should be stressed that stress crack corrosion rarely, if ever, occurs on dry clean cans. 24 Typical section through a score showing beginning of a crack (simplified). I, Aluminium; 2, lacquer; 3, oxide layer; 4, stress crack. 38 CANMAKING General corrosion offoodcans. Filling practices impact significantly on the subsequent extemal corrosion of filled packs and in the case of steel food cans the specification of (cooling) water needs to be controlled.
The resins used in the film forming component of a coating formulation, which may be of one or more types in any one coating, can be regarded as being oftwo basic types, namely oleo-resinous and synthetic. The former are based on natural products (fossil gums and drying oils) mixed with other resins. The latter are carefully synthezised products, which may additionally contain certain natural raw materials. 1 Oleo-resinous products These are amongst the earliest materials to be used in the metal packaging industry and they are still in use, largely because of their low applied cost.
Two-piece aluminium aerosols are made by impact extrusion to produce a straight-sided cylinder, which is then decorated and subsequent swaged-in to form a cone-shaped top, that can accept a valve-cup. The extrusion process uses a thick aluminium disk or slug, which is placed in the die of the extrusion press. 17. The cylinder is ejected from the die and is then washed, normally in alkali, rinsed and dried before moving to the next stage in the manufacturing process, which is decoration. Various processes are used in the decoration of impact-extruded aerosols.