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Can Coding: How Filling Lines Mark Metal Cans That Stay Readable
Release time:
2026-09-10
Metal cans punish bad marking — curved, fast, and wet. This guide shows how filling lines choose a coder and keep batch and expiry codes legible.
Summary: Cans move fast and resist ink. This guide covers how filling and packaging lines choose a coder for metal surfaces, where on the can to print, and how to keep batch and expiry codes legible through condensation, line speed, and the cold cans that come straight off the filler.
Metal cans are among the hardest surfaces a coder will ever meet. They are curved, they move fast, and the moment they leave the filler they are wet, cold, or carrying a film of oil. A batch code that looks crisp at the print head can smear before the case is sealed. Lines that mark cans well treat the coder as part of the filling cell, not a bolt-on afterthought at the end of the conveyor.
Match the Coder to the Surface, Not the Catalog
CIJ does the typical can line without drama. It prints on the fly, at speed, with no contact, which is exactly what a wet, fast line needs. TIJ reads cleaner on a flat panel but loses its grip the instant condensation films the can — and cans are wet right after filling. The practical call is CIJ for high-speed beverage lines and TIJ only where the can is dry and the speed is modest.
Mark Where the Line Lets You
The base of the can is the safe spot: flat, dry, away from the seam. The lid works too, but only if the coder reaches it without slowing the line. Pick one location and keep it. A code that jumps between base and lid shift to shift is the quickest way to fail a traceability audit.
Keep the Code Short and Useful
On a can you rarely get more than a few characters before they crowd and blur. Batch, line, and a Julian or shift date cover most recalls. Expiry belongs on the secondary pack unless the market demands it on the can itself. Long strings look thorough and read as noise once the line is running.
Plan for the Wet, Not the Demo
Most coding problems on cans show up after the line is at speed and the cans are cold. Test the ink on a can straight from the filler, not a dry sample from the office. A compatible chip keeps the coder reading its own consumables without the OEM price, which matters when you run several lines and swap ink by the week. The real test is legibility at the end of a shift, not the start.
For more on CIJ TIJ consumables and compatible chips, browse our industry insights.
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All referenced brand names including Linx, Imaje, Domino, VJ are used solely for illustrating product compatibility scope.
Topmark has no affiliation, authorization, partnership or official endorsement with any industrial printer manufacturers.
All products offered by Topmark are third-party compatible consumables, not genuine original OEM spare parts.
No trademark ownership is claimed for any trademarks mentioned herein.
