A conventional printing process, for example flexography or gravure, is used to lay down a laser reactive coating in a patch on to a packaging substrate.
The substrate is typically corrugate board, paper, plastic film or foil. Then, at the latest point in the product supply chain i.e. at the point of packing or filling, the pre-printed patch is exposed to specific laser wavelengths, which activates the coating to print variable data or graphics as required. Each pack can be printed uniquely and no consumables – inks or ribbons – are required at the point of printing.
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