Third, pay attention to the events 1 and process points 1 process flow.
Pre-treatment of the substrate - use gauze, industrial gasoline to clean the oil on the surface of the plate or use a brush, acid treatment, etc. to process the coating ~ use 90 ~ 300 mesh / inch nylon mesh for the full coating method to dry ~ "printing after the ink table After drying, oven drying in a constant temperature, temperature 80 ~ 100 ° C, time 15 exposure ~) - exposure under xenon lamp, metal halide lamp, iodine gallium lamp, coal fine lamp 1 ~ 3nin development 1 - sodium carbonate, concentration 0.8 %~1.2% spray or dipping dry) - Natural drying or drying can be modified ~) - Corrosion-resistant ink back coating protective layer pattern corrosion - Protected with corrosion-resistant paint (traditional protection, protective film, circuit board After the resist ink is diluted and sprayed) - using a solvent such as ferric chloride or copper chloride, and sodium chloride to oxidize the light directly, the window is equipped with a dark curtain fabric, and the incandescent lamp and the neon lamp are also protected from light. The environment is operated under a dust-free yellow light. The indoor temperature is 20~25C, not more than 30C, and the humidity is about 70%.
P month cool, the shelf life is generally 3 to 6 months.
The ink becomes thicker and can be diluted with a mixed solution of cyclohexanone and xylene.
2Mn (after drying).
Poor development, adhesion to the photographic plate after exposure is not easy to separate.
(2) Too thin: It is easy to cause overexposure, which causes development difficulty. When the film is corroded, the film layer cannot withstand the corrosion of the corrosive liquid to cause defective products, and at the same time, it is difficult to remove the ink.
The drying condition of the ink layer is not too high, and the time should not be too long. As long as it is dry, the temperature is high for a long time, which promotes the hardening of the photosensitive ink layer, which makes it difficult to develop and remove the ink. If the temperature is too low and the time is short, the printing ink layer is not dried, and the photographic plate adheres to the film layer after exposure and is not easily separated.
The environment is strictly anti-mother to ink ~ 70~75 °C 5% ammonia sodium immersion, to remove the ink layer after expansion, if the ink layer is difficult to remove, can be divided into two deinking process flow screen printing 200Z4 No serious narrative is caused by the occurrence of serious yellow pollution.
The eclipse method produces ionization under the condition of electrification, and has obtained gratifying practical experience. The wastewater discharge meets environmental protection requirements, eliminates pollution, and has positive promotion value.
5. Electric coloring (electric forging color) and control box. The control box is composed of rectifier, DC voltmeter, AC ammeter, thermometer and time controller. There are two types, manual and crawler.
There is no need to remove the ink protective layer, first punch a hole of f3~5nm, as the conductive hole in the electric coloring and the fastening hole of the fixture (hanger), the fixture is made of conductive metal.
The sleeve is placed on the screw of the fixture to be fastened to the fixture, and the plating solution is pre-brushed on the plate with a stylus to make the layout infiltrated.
Plating bath temperature (29±1>C plating time 60s color: Most of the main color of the sign is black, sometimes designed as red and black, so it is recommended that the scale factory can set two cylinders. Before the color, the plating solution in the cylinder should be evenly stirred, so that the thickness of the paint film is relatively uniform.
Sixth, excellent and shortcomings (1) The ink layer of the photosensitive ink is firmly combined with the substrate material; (2> contact exposure can ensure the accuracy of the pattern and the precision of the special fine line; the corrosion resistance is better than the traditional bone glue layer, and there are few drills. Defects of eclipse; materials and workpieces that are particularly thick, difficult to be coated with molded parts; source, meet the requirements of environmental protection departments, benefiting the people; the source of electrocorrosive liquid is abundant, easy to purchase, lower than the cost of ferric chloride; the same batch of products The thickness of the paint film is basically the same; the electro-coloring process eliminates the pollution of the benzene ester gas to the workers, ensures the health of the workers; saves labor, shortens the production cycle, and improves the competitiveness of the enterprise.
Since the photosensitive ink contains an organic solvent, the odor is relatively large.
VII. Conclusion In the 1980s, it was suggested that the metal corrosion signage process be eliminated in China. The reason is mainly due to the large amount of wastewater generated during the sign production process and the lack of advanced solutions. In fact, more than 20 years have passed, not only has not been able to achieve the goal of elimination, but in some sectors, the demand for stainless steel, bronze and titanium signs has increased, so the environmentally friendly corrosion signage process has a positive promotion value, Liminli enterprise. The author has only made a preliminary exploration of this environmentally friendly corrosion process. The scope of practice is still not wide, and little is known. More practice is still waiting for the concerted efforts of the peers. If there is any inconvenience, we welcome criticism and correction.
é› ç‰›ä»” 牛仔 牛仔 牛仔 牛仔 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I The performance of the denim is a series of finishing, such as rinsing, enzyme washing, stone washing, embroidering, etc., making denim in the world of fashion has become a long-lasting leader. But unfortunately, people have been unable to use the discharge printing process commonly used on other dark fabrics on indigo denim, which makes the indigo denim unable to obtain colorful patterns and affects the fashion designer to some extent. Their range of applications and meet the aesthetic requirements of consumers. It was not until the early 1990s that BASF developed the world's first auxiliaries for the printing of indigo denim. However, due to the serious pollution caused by the production of this auxiliaries, it was stopped after a few years. At this time, domestic companies have also made similar products one after another, but the process is complicated when printing, the stable injection is difficult to control and the finished product is dark, so that only about 10 printing factories in China have used such additives for indigo. Cloth printing has affected the export of printed denim fabrics and garments. I have been working on 20Q24 screen printing of indigo denim since the early 1990s.
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