Spectral Output
Light sources operating at wavelengths between 390 and 420 nanometers provide the high energy required to expose polymer plates and offset coatings. A blue-violet laser generates a concentrated beam that targets specific photoinitiators in the emulsion of a printing plate. This narrow frequency allows for finer dot reproduction.
Curing Efficiency
Polymerization occurs rapidly when the substrate surface absorbs the high energy photons. Using a blue-violet laser reduces the time required to lock the image onto the carrier, which increases the throughput of the computer to plate imaging system. Solid state construction allows these units to start instantly without the warm up cycles associated with mercury vapor lamps.
Lower heat emission protects the dimensional stability of thin polyester or paper backings during the exposure phase.
Plate Fidelity
Sharpness in the highlight and shadow areas depends on the spot size and the stability of the light path. Because the blue-violet laser operates at a shorter wavelength than infrared alternatives, it produces a smaller focal point for higher resolution screening. Fine text and complex micro-printing remain legible even at high speeds.
Stable diode temperature ensures that the beam profile remains circular to avoid distortion in the printed halftone dots.
