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Drying
Solvent based inks

Drying occurs through:
• Forced evaporation of the solvent
The print is passed through a hot air drying chamber that extracts the emitted vapour. In certain cases, extraction can be used on its own if the substrate is likely to be deformed by high temperatures.



• Through penetration into the substrate
Uniquely in the case of absorbent substrates (paper, cardboard, etc.), part of the solvent penetrates into the substrate.

The elimination of solvent leads to an increase in the viscosity of the ink and then gives a dry ink film that adheres well to the substrate.
Both methods of drying may be combined.
Water based inks
Drying and film formation in water based inks are complex phenomena.
Drying takes place through:
• Coalescence
The emulsion or dispersion, which acts as binder for the ink, contains small spherical particles held in suspension. The evaporation of the aqueous phase enables these particles to come into contact with each other and form a continuous film.
• Through penetration into the substrate
Uniquely in the case of absorbent substrates (paper, cardboard, etc.), part of the solvent penetrates into the substrate.

The elimination of solvent leads to an increase in the viscosity of the ink and then gives a dry ink film that adheres well to the substrate.
Both methods of drying may be combined.
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