Drum finishes

Drums. Typical selection for the number of dmms used in the various appHcations is two to four for cobbers, one or two for roughers, and two or three for finishers. The inner dmm sheU, usually 3 mm thick, is specified Series 302 or 304 stainless steel. Dmm heads are usually of high tensile strength aluminum alloy or brass. Recessed head bolt constmction having an effective seal is specified. 

Fig. 8. (a) A double-drum concurrent cobber arrangement (b) a double-dmm countercurrent (Steffenson) finisher arrangement. 

Guard and safety Raw-material and finished-product storage—tanks, spheres, drums, bins. 

Semi-finished products are first heated in a re-heat furnace until they are red hot (around 1200 C). On all types of mill the semi-finished products go first to a roughing stand. A stand is a collection of steel rolls (or drums) on which pressure can be applied to squeeze the hot steel passing through them, and arranged so as to form the steel into the required shape. The roughing stand is the first part of the rolling mill. The large semi-finished product is often passed... 

Major uses of epoxy resins are coatings for appliance finishes, auto primers, adhesive, and in coatings for cans and drums. Interior coatings of drums used for chemicals and solvents manifests its chemical resistance. 

Some inventory of finished product must be held to match production with sales. Provision for product packaging and transport will also be needed, depending on the nature of the product. Liquids will normally be dispatched in drums and in bulk tankers (road, rail and sea), solids in sacks, cartons or bales. 

Washing machines currently on the market are constructed almost exclusively with drums and laundry tubs of corrosion-resistant stainless steel or with an enameled finish that is inert to alkaline wash liquors. Nevertheless, various machine components are made of less detergent resistant metals or alloys. To prevent corrosion of these parts, modern detergents contain corrosion inhibitors in the form of sodium silicate. The colloidal silicate that is present, deposits as a thin, inert layer on metallic surfaces, thereby protecting them from attack by alkali. 

Magnetic finishing drums, 15 446 Magnetic flocculation, 16 639 Magnetic flow meters, 20 681 Magnetic flux, exponents of dimensions, 8 585t... 

Outdoor storage related to processing facilities can encompass a wide-range of chemicals including raw materials, intermediates, finished, and off-specification product in a variety of container types such as drums, portable and tote tanks, and intermodal tank containers. Materials, including spare, surplus, or salvaged equipment, are also stored outdoors. 

In some facilities, there is a need for refrigerated storage of one or more flammable or combustible raw materials, catalysts, intermediate products, or finished goods. These materials may be in solid or liquid form in containers, boxes, drums, or small portable tanks. Depending on quantity of materials to be stored and required temperature, these facilities can range from cold storage warehouses for storage of food products to walk-in freezer rooms for pharmaceutical materials. 

Typically, ore bodies are relatively low in iron content. Iron minerals are finely divided in a gangue matrix. Wet grinding is usually required to liberate the iron minerals, although some beach sands may have liberated iron mineral values. Wet drum separators are limited to the treatment of material <10 mm. The magnetic drum separators applied are usually related to the grinding circuit required to liberate the iron mineral, and are typically designated by application as cobbers, roughers, or finishers. 

The standard conventional finishing process has been modified to suit the purposes for different fabrics and garments. For example, tubular knits are frequently handled using specialized equipment to control tension and to get adequate padding. Some tubular knits are subjected to wet-on-wet padding, dried and cured in large drum dryers, and steam-treated to achieve a relaxed and nondistorted knit. 

During the last hours of polishing the side door in the drum is opened so that some of the moisture escapes. The overall polishing process lasts for 4-24 hr, depending on the type of powder. The finished grains are more slippery, pour more easily and fill space better than the unpolished product. 

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