Corrosion signs are a branch of traditional signs, so there are many varieties, which can be used as signs on the surface of instruments, it is useful for vehicle and vessel license plates, equipment numbers and nameplate
s of various machine tools and electrical appliances, as well as copper signs with relatively harsh industrial environment, etc. Let's introduce the silk screen printing process of corrosive signs.
The general process of silk screen printing process for corroding signs is: preparation of printing materials and surface treatment before printing; Prepare the printing material; Making screen printing plates; Printing; Check and repair parts; Corrosion; Cleaning and drying; Finished product. First, the surface treatment of the substrate.
Copper-based and iron-based materials only need to remove the surface oxide layer in dilute sulfuric acid, rinse with running water, and print after drying.
Aluminum-based materials generally remove oil stains in hot sodium carbonate solution, and can be screened on the Internet after cleaning and drying.
The removal of oil stains can also use organic solvents such as gasoline, banana oil, trichloroethylene, cyclohexanone, etc. , or 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 wiping and brushing, and then oil withdrawal can be carried out. Second, printing materials.
There are many kinds of printing materials used for screen printing signs, but the printing materials used for screen printing of corrosion signs generally only use corrosion-resistant printing materials.
It should have good film forming property, easy drying, good net crossing property, good corrosion resistance, convenient removal and other properties. Third, printing. A. Printing method. Manual or mechanical, mainly manual. B. Network station distance.
Depending on the screen printing area, it is generally 3 ~ 5mm. C. Scraper. a)
Material: polycavity Ester rubber, thickness 8 ~ 12mm, hardness shore A50 ~ 60 degrees. B)
Size: The length should be 20 ~ longer than the width of the screen print ~, The height of the rubber strip exposed to the handle is 20 ~ 30mm. c)Scratch angle: 60 ~ 70 °At 45It is better. Fourth, corrosion.
After inspection, repair and drying, the printed semi-finished signs can be delivered to the next process for corrosion.
Five, after the corrosion can be cleaned, drying procedures. Sixth, complete into a finished product.
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