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 circa 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.