The graphic production of metal signs has experienced four generations: strong generation, corrosion painting production method; The second generation, photochemical printing process; The third generation, screen printing production method; The fourth generation, lithography offset production method.

Text and pattern is the main content of the sign, the use of offset printing technology to produce graphic methods in foreign use is more common, such as in the electronics industry is highly developed in the United States, Japan, the production of aluminum plate offset printing accounted for 60%, resin screen printing accounted for 30%, other production methods accounted for 10%

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