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1. Steel strip arrives at the can manufacturing plant in large coils.
Metal plates shipped to cannery in large rolls
2. Steel strip is cut into large sheets
The web is cut into large sheets
3. Lacquer is applied to the side of the sheets that will become the internal surfaces of the finished cans. This special lacquer is to protect the can itself from corrosion and from any possibility of interaction between the contents and the metal.
The paint will be painted on the side that will be the inside surface of the tank to prevent the metal itself from rusting or reacting with the contents.
4. The lacquered sheets are dried in an oven.
The paint film is dried in the drying tunnel
5. The large sheets are slit into small sheets, one for each can body.
The sheet is divided into small pieces and each piece is made into a can body
6. Each small sheet is rolled into a cylinder.
Each piece is rolled into a cylinder
7. The cylinder edges are welded by squeezing them together Ì„ passing electric current through them. This heats up the metal cheerful for a sound joint to be made.
The two sides of the drum squeeze together and pass current, which heats the metal surface and firmly welds the two sides of the metal together
8. The inside surface of the weld is sprayed with lacquer and then cured by blowing heated air on to the outside of the cans.
Cans are sprayed on the inner wall and blown hot air outside the tank to make it dry
9. The cans are passed through a flanger where the top and bottom of the can are flanged outwards to accept the ends.
The can body is formed by a scraper to fold the top and bottom of the can to be combined with the bottom of the can
10. Plain ends are seamed to the can bodies to close one end of every can.
Each can body is rolled together with a can bottom
11. The cans are passed through a beader where the walls of the cans have rounded beads formed in them to give added strength.
The cans are rolled on the cans by a tumbling machine to increase the can strength
12. Every can is tested at each stage of manufacture.
At the final stage they pass through a pressure tester, which automatically rejects any cans with pinholes or fractures
Jars are tested at every production stage. Finally, the can passes a pressure detector and automatically eliminates pinholes or burst jars.
13. The finished can bodiesare then transferred to the warehouse to be automatically palletised before despatch to the filling plant.
Finished tanks are transported to warehouses and palletized automatically for shipment to the filling plant
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