classified in this way the film produced according to quality:
"FIRST QUALITY ": Quality first is the normal production of electrolytic tinning line subject to the usual procedures of inspection and testing of finished product, this film is suitable for lithographic coatings and in general can be used to its fullest extent. It should also be free of holes, wrinkles, breaks, bumps and lumps of tin inlaid on the surface.Request
"STANDARD QUALITY ": Material in sheet form which is the product for inspection at the production line, with a mix of first quality criteria and up to 5% of quality second. It is suitable under normal storage conditions, lithographic coatings and general purpose tin. This film should be free of holes, wrinkles and lumps of tin inlaid on the surface. Escuchar Leer fonéticamente Diccionario - Ver diccionario detallado Request
"SECOND QUALITY": The production quality is second rejected and / or classified electrolytic tinning line subject to the usual processes of inspection and testing of finished products and / or grading banks. You can file bankruptcy, wrinkles, dents, rust in the form of maps. Ties are not allowed to film.
"SURPLUS": Are cuts, scraps, rejected by-product of electrolytic tinning line for compacting scrap, which is fully oxidized uncoated sheet, Tin with wrinkles over 40% of surface area and oxide Tin over 60% of surface area.
Modern E.T.P. production uses an electrolytic or electro-deposition process to apply tin on steel.
This system provides better control over the tin layer thickness and makes it possible to produce Electrolytic Tinplate (ETP) with different coatings on each side (differential Electrolytic Tinplate).
The following are some of the main stages in the processing Section:
1. Cleaning: In order to remove the organic oil used to protect the sheet from humidity in the air during transportation and storage, the sheet is cleaned with a hot alkali solution (caustic soda, sequestering agent, a surface activating wetting agent) and in the solution of the sheet is passed between two plates with different polarities, which generates an electrolytic cleaning system created by the sheet and the plate which generates hydrogen (H2) and oxygen (O2). This system is complemented with a rinsing stage.
2. Descaling: The sheet is passed through a hot dilute sulfuric acid (H2SO4) solution in order to eliminate any iron oxide that might have formed and could prevent proper tinning later. The process makes it possible to activate the surface to receive the tin. The descaling process is also complemented with a rinse.
3. Electrolytic Tinning: This section involves two steps that make it possible to cover the sheet with two equal or different layers of tin (differential tinning). The electrolyte is a solution of sodium fluorstanite, bivalent tin (Sn+2) oxidation inhibitors and additives (buffing agent). Each story has continuous current sources for electrolytic tinning.
4. Recovery Tank: The tin salts that might have been carried by the surface of the tin sheet are eliminated using a sodium bifluoride solution.
5. Hot Wash: The sheet is passed through a hot, dilute, hydrochloric acid (HCL) solution in order to produce with the tin a fluxing agent that will enable the formation of the iron-tin alloy when it melts (buffing).
6. Differential Marking: Using a sodium carbonate solution and rubber rings placed on the sheet it is possible to make conventional markings on the top face to differentiate the type of coating.
7. Reflux: This is a special foundry system which uses electrical current to heat the sheet, and rapid cooling (quenching), which enables part of the tin to form an alloy with the steel, and the rest (free tin) to take on a shiny clearance. The iron-tin alloy (Fe-Sn2) makes it possible to obtain electrolytic tinplate with special corrosion resistant properties.
8. Passivation: Eliminates a thin film of stannous and stannic oxide which is formed during reflux and deposits chromium and chromium oxide film that prevents further oxidation of the tin.
9. Oiling: to protect the sheet from the humidity in the air and facilitate handling, the sheet is passed through an electrostatic oiler where small amounts of oil are applied.
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