Metal etching process（一）

(1) Metal etching process

The type of metal is different, the etching process is also different, but the general process is as follows: metal etching plate → degreasing → water washing → etching → water washing → drying → screen printing → drying → water immersion for 2~3min → etching pattern Text → water washing → ink removal → water washing → acid washing → water washing → electrolytic polishing → water washing → dyeing or electroplating → water washing → hot water washing → drying → soft cloth polishing (polishing) light → spraying transparent paint → drying → inspection → finished product packaging.

1. Pre-etching treatment

The processes before metal etching are all pre-treatments. It is a key process to ensure good adhesion between the screen printing ink and the metal surface. Therefore, it is necessary to thoroughly remove the oil stains and oxide films on the metal etching surface. Degreasing should be based on the oil pollution of the workpiece to determine the plan, it is best to remove the oil before the silk screen to ensure the effect of degreasing. In addition to the oxide film, the best etching solution should be selected according to the type of metal and film thickness to ensure that the surface is cleaned. It must be dried before screen printing. If there is moisture, it will also affect the adhesion of the ink, and affect the effect of subsequent pattern etching or even aliasing, which affects the decorative effect.

2. Screen printing

Screen printing should produce standard pattern screen printing screens according to the needs of printing. In the pattern decoration process, the silk screen mainly plays a protective role, and the photosensitive glue should be applied more often to make a thicker silk screen template, so that the covering performance is good, and the etched pattern has a high definition. Under the action of light, the glue film of the screen plate produces a photochemical reaction, so that the illuminated part is cross-linked into a water-insoluble glue film, and the non-illuminated part is dissolved by water to expose the screen space, so that the coated silk The screen pattern is lithographically engraved on the screen to conform to the pattern of the black and white positive positive film.

Fix the screen printing screen with pattern on the screen printing machine, and use alkali-soluble acid-resistant ink to print the required pattern on the metal plate, and then it can be etched after drying.

The processes before metal etching are all pre-treatments. It is a key process to ensure good adhesion between the screen printing ink and the metal surface. Therefore, it is necessary to thoroughly remove the oil stains and oxide films on the metal etching surface. Degreasing should be based on the oil pollution of the workpiece to determine the plan, it is best to remove the oil before the silk screen to ensure the effect of degreasing. In addition to the oxide film, the best etching solution should be selected according to the type of metal and film thickness to ensure that the surface is cleaned. It must be dried before screen printing. If there is moisture, it will also affect the adhesion of the ink, and affect the effect of subsequent pattern etching or even aliasing, which affects the decorative effect.