Drying

Ideal light wavelengths - simple system integration - optimal power range

The process

With the help of high-power lasers, one of the classical methods for drying printing inks can be supported: The absorption of printing inks through the printed underground. The laser beams heat up the color coating and thus decrease the viscosity of the print oils. As a result, the ink becomes more fluent and can thus be more quickly absorbed by the substrate. The spectral range of the used laser beam is close to the near infrared (NIR), or more precisely: between approx. 900 and 1070 nanometers wavelength.

The process advantages of the diode lasers

To realize the laser drying of printing inks, the beam source is mostly directly integrated into the printing system. This usually requires a very compact design of the laser, as well as a fiber coupling of the output beam. With their high energy efficiency, long lifetime, and unusual low maintenance effort, lasers can be additionally persuasive in economic terms.

Application examples

System integrated drying of offset color layers

An optimal laser drying of offset color layers requires the direct integration of the beam source into the printing system. This is the only way to achieve a possibly effective drying and thus an efficient process control. For this, the laser head, supply unit, as well as the necessary homogenizers and line focus optics have to be integrated exactly into the given assembly space. This requires compact, individually suitable components. The diode lasers and optics of Laserline meet these demands in an optimal way: their modular and compact design makes it possible to tailor all components precisely to the individual customer’s needs. Power compromises do not need to be accepted. Despite their highly compact design, Laserline's diode lasers can easily provide powers in the double-digit kilowatt range.