Corrosion screen printing sign flow
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Corrosion placard is a traditional signage. It is used as the grit-blasting oxidizing filler mark for instrument panel. It is used as the corrosion and baking sign for the nameplate of vehicle and ship license plate, equipment number and all kinds of machine tool electrical appliances. It is used as the electromechanical environment with poor industrial environment. The product's copper plated front plate is used as a sign of porcelain oxide lacquer on the surface of instruments and electronic instruments, as well as high-cursor plates. The graphics on these labels were all visualized by photochemical methods using liquid photosensitive adhesives (protein gel, bone glue, gelatin, polyvinyl alcohol glue, etc.). Although this method has the advantage of small graphics and text distortion, there are many defects in the production process, such as low production efficiency, high labor intensity, and high energy consumption. The use of screen printing methods to visualize texts can increase production efficiency by several times and save a lot of auxiliary materials and energy. Below, the reader is specifically introduced to the graphic and silkscreen printing process of corrosion signs.
Silk screen printing process signs are: printing material preparation and prepress surface treatment - → preparation of printing materials - → production of screen printing plates - → printing - → inspection repair - → corrosion - → cleaning and drying - → finished products.
1 substrate surface treatment. Copper-base and iron-based materials only need to remove the surface oxide layer in dilute sulfuric acid, and rinse with running water, and then print it after drying. Aluminum-based materials generally degrease the oil in hot sodium carbonate solution, and can be screen printed on the Internet after cleaning and drying. The removal of oil can also use organic solvents such as gasoline, banana water, trichloroethylene, cyclohexanone, etc., or detergents, detergents, special diluents, etc. If there are serious pits, scratches, and oxidation spots on the surface of the metal substrate, it may be treated by mechanical polishing or rubbing and brushing, and then the oil may be removed.
2 printing materials. There are many kinds of printing materials used for silk screen labels, but the printing materials used to etch signs for screen printing generally only use resist printing materials. It should have good film-forming properties, easy drying, good web resistance, good corrosion resistance, and easy removal. Commonly used anti-corrosion printing materials are as follows:
a. Thick lacquer prints. Thick lacquer printing is a traditional printing material. Thick lacquer is generally made of dry oil thick paint, added with a certain amount of phenolic varnish, alkyd varnish, asphalt acid paint, etc.