Cold transfer is realized via two conventional printing units in an offset printing press.
The first printing unit applies an application-specific adhesive (adhesive printing ink) via an inking unit, an offset printing plate. Depending on requirements, the ink can be applied either partially or over the entire sheet. Fine lines and fonts as well as halftone effects can be transferred, since the properties of offset printing come into play during adhesive application just as they do with a conventional offset printing ink. Via a second printing unit, which is equipped with a special cold transfer module and an unwinding and rewinding station, the cold transfer product is fed into the printing nip between the blanket cylinder and the impression cylinder and transferred under pressure to the areas of the sheet where the adhesive has been applied.
After the backing material has been removed, the metallized transfer layer remains on the substrate and adheres directly and permanently to the sheet preprinted with the adhesive by means of a special adhesive layer.
Advantages:
• The transfer of finest details, fonts as well as areas and screens are possible in one operation
• Inline and offline overprinting processes are possible.
• No hot stamping clichés are required for cold product transfer.
• No heat or high pressure is required for the process.
• The surface structure of the substrate is retained on both sides, and there is no deformation of the substrate.
• Very short makeready times and fast roll and job changes.
• Fast changeover from cold transfer mode to standard printing mode.
• Very high production speeds.
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