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Why Date Codes Smudge on Cold Aluminium Cans and How to Fix Them
Release time:
2026-10-12
Cold, wet aluminium cans make CIJ codes smear and flake. The real causes, from condensation to ink choice, and the settings that keep date codes legible.
Summary: Codes smudge on aluminium cans for physical reasons: condensation, a non-wetting oxide surface, and ink chosen for cartons. Move the print point past the warming zone, switch to a fast-dry non-porous CIJ grade, hold print distance tight, and test with real line cans. Most plants fix this without touching the printer itself.
Condensation Is the First Enemy
Aluminium cans leave the filler cold and wet. Chill the product before filling, as most beverage lines do, and the can surface sits below the dew point of the hall. Ink lands on a film of water, not on metal. Half the smudge complaints I have walked into were solved by moving the coder four metres downstream and letting the cans warm and dry first. Free. No consumable changes, no service call.
The Surface Reflects, the Ink Does Not Care
Bare aluminium is a poor wetting surface. It is smooth, oxidised within seconds of forming, and often carries a thin film of lubricant from the can line itself. CIJ inks that behave well on cartons struggle here because adhesion, not drying, is the bottleneck. If operators respond by turning the print head down and slowing the line, rejects rise for a different reason: weak contrast on a shiny, curved wall.
Ink Choice Beats Pressure Tweaks
For cans, the answer is almost always the ink, not the machine. Fast-drying non-porous grades — the same families used on metal closures and foil laminates — bite into the oxide layer and hold through condensation that would wash standard ink off. Our VJ-compatible CIJ ink range for non-porous metals exists for exactly this application. Switching grade costs little; retuning a whole line around the wrong ink costs a season.
Set the Line Around the Code
Three settings carry most of the result. Print distance held at the tight end of the head's range, because a curved wall punishes distance twice over. Line speed matched so each can gets a complete pass — a code that wraps the seam reads as two halves at the scanner. And a warm-up target: the can surface should clear the dew point before the head, which is a conveyor question more than a printing one.
Fixes That Actually Hold
Move the print point after the warming zone if you can. Cheapest fix on the list.
Change to a non-porous fast-dry grade before touching machine settings. One parameter change beats five.
Clean the head at shift change in wet halls. Condensation does not spare the nozzle plate either.
Test with cans straight off the line, not bench samples. A lab at room temperature will tell you the ink works. It will not tell you the hall is the problem.
Codes fail on cans for boring physical reasons, and they stay fixed for boring physical reasons: dry surface, matched ink, tight distance. Plants that treat it as an ink and layout question stop chasing it. Plants that keep adjusting the printer chase it every summer.
Related part reference: VJ V4210-D solvent chip.
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.
