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Introduction to Process-Free CTP Plates
Broadly speaking, it means that the plate can be printed on the machine without any subsequent processing steps after exposure and imaging on the platesetting equipment. Certainly do not need chemical development, washing, etc., is the real treatment-free plate; in a narrow sense, it refers to the plate in the plate making machine after exposure imaging does not require chemical development, but there are still some non-chemical processing procedures, such as removing the plate ablation waste, coating and other protective adhesive.
Introduction:
Broadly speaking, it refers to the plate after exposure imaging on the platesetting equipment, without any subsequent processing steps can be printed on the machine. Of course, no chemical development, washing, etc., is the real treatment-free plate; In a narrow sense, it refers to the plate does not need chemical development after exposure imaging on the platesetter, but there are still some non-chemical processing procedures, such as removal of plate ablation waste, coating, etc., of the protective adhesive.
Classification:
Thermal Ablative Plates, Polarity Conversion Technology Plates and Thermal Fusion Technology Plates.
Thermal ablative plates are generally double-coated, with an inky layer on the bottom and a hydrophilic layer on the top. During exposure, the laser energy ablates the hydrophilic layer, exposing the inky layer and forming the graphic; the unexposed portion remains hydrophilic and blank for the layout. Thermal ablation technology has not worked well in practice, mainly because the dust and debris generated by the ablation affects the accuracy of the platemaker's optics and is detrimental to health and the environment. In addition, the blank portion of the thermal ablative plate is hydrophilic coated, and its ability to control the water-ink balance and print resistance is not as good as that of traditional PS and CTP plates.
No-treatment plates with polarity conversion technology are single-layer coated with a hydrophilic (or lipophilic) drug film layer. After exposure, the polarity of the drug film layer changes to lipophilic (or hydrophilic). ), the exposed portion is the graphic (or blank) portion of the plate. Such plates do not require any treatment after exposure and can be printed directly on the press.
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