| |
Manufacturing Process
| The following is the standard operating procedure for can making: |
| |
| • |
Printing – Lacquering – Varnishing |
| • |
Slitting |
| • |
Component Making |
| • |
Welding |
| • |
Flanging - Beading – Seamer |
Printing - Lacquering - Varnishing
Tinplate sheets are printed according to artwork and design specifications supplied by the customers. An additional protective layer of varnish is added to the exterior of the containers. Varnishing adds lustre and a touch of gloss to the printed sheets making them scratch resistant. For food products, the sheets are lacquered inside with epoxy coatings. This process adds to their shelf life by preventing reaction between the food and the metal. Outside lacquering, mainly in gold, is used for decorative purposes.
Slitting
The printed and lacquered sheets are trimmed to the required size, depending on type of container and components - sheets for cans and strips for component making
Component Making
The company has in-house component lines. Components consists of top viz., ring - lid - tagger (Aluminium foil). Manual or auto feed power presses, with various tools and dies that subscribe to specified dimensions and internationally accepted tolerance levels make these. The components are then disc curled to reduce their sharpness. The bottoms and rings of further cans are lined with rubber, which act as a sealant, making the cans leak-proof and moisture-free. Both cans and ends are packed and labeled in appropriate packaging
Welding
Trimmed size sheet is fed into the Body maker to form the body of the container. The body blanks are rolled and welded on an automatic, side-seam, welder machine. The body is lacquered on both sides with epoxy coatings on the welding line. The body then passes through an overhead conveyor into an oven where the lacquer is dried on gas flame for about 10 seconds.
Flanging - Beading - Seamer
A multi-head flanger is used for flanging on both sides, so as to give a flare to the cylinder. The thickness of tinplate is generally reduced to maximise strength of the product. This is augmented by beading on the cylinder, done with the help of a multi-head beader machine. The top surface is seamed on the cylinder of the can, using a multi-head seamer. One end is supplied separately with the container.
|
