Direct media
Similar to the diversity of plate imagesetters, the diversity of direct media systems is also dazzling. Currently, there are silver salt plates, photopolymer plates, infrared thermal plates, and ink-jet plates. Four categories.
Silver salt plate
The silver salt plate mainly includes three types: silver salt and PS plate composite plate, upward diffusion plate, and downward diffusion plate.
The silver salt and PS plate composite direct plate mainly uses the high sensitivity and wide color sensing range of the silver salt emulsion layer to complete laser direct scanning imaging of the plate, and the requirements of the printing process are satisfied by using the excellent printability of the PS plate. The ingenious combination of the use of the mature silver salt photosensitive material and the PS plate material technology to construct a direct plate material has caused a stir in the early days of the direct plate material.
The printability and printability are exactly the same as in the traditional PS version. However, this plate has a complicated structure and requires multiple exposures and post-processing such as development (fixing), and the process is cumbersome. This is also the main reason why this type of plate is difficult to realize large-scale industrialization.
The up-diffusion type direct plate is composed of a plate base, a silver salt emulsion layer and a physical development core layer. After laser scanning imaging, diffusion development is performed.
The silver ions in the unexposed areas diffuse upward and are reduced to metallic silver by the physical development nuclei of the surface layer and become oleophilic surfaces. The surface layer of the exposed area is still an emulsion layer and has good hydrophilicity. The substrate of this plate can be either a metallic material, such as aluminum, or a flexible polymeric substrate, such as a polyester substrate, in most cases a flexible polymeric substrate.
The down-diffusion type silver salt plate is composed of an aluminum plate having a good hydrophilic surface, a physical development core layer, and a silver salt emulsion layer.
After laser scanning imaging, diffusion development is performed. The silver ions in the exposed area diffuse downward and are reduced to metallic silver by the underlying physical development nucleus and become the last lipophilic surface; then the emulsion layer is removed and the surface of the hydrophilic plate base in the exposed area is exposed as a hydrophilic layer. This plate has a very high sensitivity and color sensing range, and is also very resistant to printing forces, suitable for high-end commercial printing.
Similar to the diversity of plate imagesetters, the diversity of direct media systems is also dazzling. Currently, there are silver salt plates, photopolymer plates, infrared thermal plates, and ink-jet plates. Four categories.
Silver salt plate
The silver salt plate mainly includes three types: silver salt and PS plate composite plate, upward diffusion plate, and downward diffusion plate.
The silver salt and PS plate composite direct plate mainly uses the high sensitivity and wide color sensing range of the silver salt emulsion layer to complete laser direct scanning imaging of the plate, and the requirements of the printing process are satisfied by using the excellent printability of the PS plate. The ingenious combination of the use of the mature silver salt photosensitive material and the PS plate material technology to construct a direct plate material has caused a stir in the early days of the direct plate material.
The printability and printability are exactly the same as in the traditional PS version. However, this plate has a complicated structure and requires multiple exposures and post-processing such as development (fixing), and the process is cumbersome. This is also the main reason why this type of plate is difficult to realize large-scale industrialization.
The up-diffusion type direct plate is composed of a plate base, a silver salt emulsion layer and a physical development core layer. After laser scanning imaging, diffusion development is performed.
The silver ions in the unexposed areas diffuse upward and are reduced to metallic silver by the physical development nuclei of the surface layer and become oleophilic surfaces. The surface layer of the exposed area is still an emulsion layer and has good hydrophilicity. The substrate of this plate can be either a metallic material, such as aluminum, or a flexible polymeric substrate, such as a polyester substrate, in most cases a flexible polymeric substrate.
The down-diffusion type silver salt plate is composed of an aluminum plate having a good hydrophilic surface, a physical development core layer, and a silver salt emulsion layer.
After laser scanning imaging, diffusion development is performed. The silver ions in the exposed area diffuse downward and are reduced to metallic silver by the underlying physical development nucleus and become the last lipophilic surface; then the emulsion layer is removed and the surface of the hydrophilic plate base in the exposed area is exposed as a hydrophilic layer. This plate has a very high sensitivity and color sensing range, and is also very resistant to printing forces, suitable for high-end commercial printing.
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