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The role of the surface layer is mainly to separate the oxygen molecules in the atmosphere to prevent them from entering the photosensitive layer, so as to increase the chain growth efficiency of the photosensitive layer, thereby obtaining high sensitivity. As a result of these effective measures, the photosensitivity of direct optical media has been greatly improved, the minimum imaging exposure has dropped to about 10μJ/cm2, second only to silver salt type direct plate, and this plate structure Simplicity, resolution, printability, and post-processing are similar to or even better than conventional PS versions.
Since most of the high-sensitivity initiator systems have an inherent photosensitivity range in the UV region, and it is also very easy to extend the photosensitivity range to the UV-LD laser's emission wavelength range, the photopolymerization direct plate will become the next generation UV direct plate material. The preferred system has a very good development prospect.
With the advent of ultraviolet photosource platesetters, many companies have begun to introduce photopolymerization direct plates suitable for imaging of ultraviolet light sources based on the original visible light photopolymerization direct plate. Typical examples are MC ImAging's LV-1 (for UV-LD lasers), LA-5 (for AR+ lasers), LY-5 (for FD-YAG lasers), and Fujifilm's LP series. Photopolymer sheet (suitable for AR+ and FD-YAG lasers) and more.
Photopolymerization Plate Structure and Function
Photopolymer plates are usually composed of an aluminum substrate, a photosensitive layer, and a surface layer. The photopolymerizable layer is mainly composed of a polymerizable monomer (+ oligomer), an initiator, a spectral sensitizer, and a film-forming resin. Initiators generally use a multi-initiator system with a high quantum efficiency. The function of the spectral sensitizer is to effectively extend the photosensitivity range of the initiator to the light emission wavelength region of the laser, and it can now be extended to 488 nm (sub-ion laser) and 532 nm ( Frequency-doubled YAG laser).