Talking about Recycling of Waste Aluminum Plate

The offset platemaking process is to develop and apply gum after exposure. In this process, developer and gum waste liquid will be generated and need to be processed. In addition, the PS plate after printing is discarded because it cannot be reused, resulting in a large amount of discarded aluminum plates.

Taking advantage of the oxidative decomposition ability and super hydrophilic property of titanium oxide photocatalyst, Kanagawa Institute and Tokyo Application Chemical Co., Ltd. conducted a research and development of "photocatalyst offset PS plate" which can reuse PS plate. First, the traditional PS plate production process and film were used to conduct a photocatalyst hydrophilic / water repellent image production test. The specific process is as follows: firstly, the titanium oxide photocatalyst coating is applied on the anodized aluminum plate to replace the original photoresist; then a self-organized monomolecular film SAM (made of a water-repellent organic substance) is formed on it Self Assembled Monolayer). Next, use a photo-printing film, which is exposed to ultraviolet light. The SAM component underneath part of the film allowing ultraviolet rays to be decomposed and removed under the action of the photocatalytic oxidative decomposition mechanism, exposing the titanium oxide coating. The titanium oxide coating shows extremely strong hydrophilic properties. In addition, the SAM of the printing plate part blocked by ultraviolet rays by the printing film remains as it is and becomes a water-repellent part. In this way, a hydrophilic / water repellent image obtained by the photocatalyst is formed. In this process, the conventional development and gumming processes after exposure are no longer necessary, so no corresponding waste liquid will be generated.

For the selected printing test pattern, under the same conditions as the lithographic printing test, obtained a positive result: the use of this printing plate is completely successful and feasible.

Next, the scope of the test was expanded, and a printing press for the web rubber press of the printing plant was conducted. In this test, a printing plate with a size of 570 mm × 309 mm was used, and a monochrome printing test with a resolution of 45 lines / inch was performed. In the 5000-page printing test conducted, good printing quality was obtained.

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