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8.1.6.1.Three piece cans
Unit 8 - Metal Containers
8.1.6.1.Three piece cans
a) Soldered side seam cans
The cross section body of the side seam can diagrammatically represented as follows.
b) Cemented side seam cans
c) Welded side seam cans
From the lacquered ECCS black plate, welding is done by mechanical cleaning of outer 2-3 mm of can blank edges prior to welding in conoweld process to minimise contamination. The welding is essentially based on resistance welding using alternating power supply. A solid phase of welded bond is formed over the entire 1.3mm width of electrode rolls. Recently, radical improvements have been made to convert the butterfly joint (
) to a solid phase welded bond which extends over entire overlap of can blank of the body (
) and welding speed upto 50m/min. The new WIMA welders welded tin plate cans suitable for food applications. In these cans, after welding side stripe coating with the lacquer is necessary and this coating quality determines the corrosion resistance of the can. Epoxy lacquer, vinyl organsol lacquer or PET powder lacquer are currently used for this purpose.
) to a solid phase welded bond which extends over entire overlap of can blank of the body () and welding speed upto 50m/min. The new WIMA welders welded tin plate cans suitable for food applications. In these cans, after welding side stripe coating with the lacquer is necessary and this coating quality determines the corrosion resistance of the can. Epoxy lacquer, vinyl organsol lacquer or PET powder lacquer are currently used for this purpose. Last modified: Wednesday, 22 June 2011, 9:35 AM