There are two kinds of materials: nonmetallic materials and metallic materials. Non-metallic materials: acrylic, double-color board, PVC, plexiglass, wood and other signs. Metal materials: stainless steel, iron, zinc alloy, brass, aluminum plate and other signs. Production technology: printing material preparation and prepress surface treatment → printing material preparation → screen printing plate production → printing → repair parts inspection → corrosion → cleaning and drying → finished products. Surface treatment of substrate. Copper-based and iron-based materials can be printed only by removing the surface oxide layer in dilute sulfur, washing with running water and drying. Aluminum-based materials are generally removed from hot sodium carbonate solution, and can be screened after cleaning and drying. Oil stains can also be removed with organic solvents such as gasoline, banana oil, trichloroethylene and cyclohexanone. , or use detergent, washing powder, special thinner, etc. If there are serious pits, scratches and oxidation spots on the surface of the metal substrate, it can be treated by mechanical polishing or friction brushing, and then degreased. Printed materials. There are many kinds of printing materials used for screen printing signs, but generally only anti-corrosion printing materials are used for screen printing pictures and texts that corrode signs. It should have good film-forming, easy drying, good screen-passing, good corrosion resistance and convenient removal. Commonly used anticorrosive printing materials are as follows: thick paint printing materials. Thick lacquer printing material is a traditional printing material. Thick paint is generally made of drying oil thick paint and a certain amount of phenolic varnish, alkyd varnish and asphalt acid-resistant paint. Removal of printed materials: The printed materials of copper and iron-based signs can be removed by alkali solution, and the aluminum-based signs can be removed by organic solvents (such as banana oil and xylene). Alkali-soluble anticorrosive printing material: Alkali-soluble anticorrosive printing material is a new printing material developed in recent years, which has the characteristics of fast drying and convenient stripping, and is especially suitable for mechanized assembly line production.