Chemical etching process juicer filter basket of introduction:
1 Clean Decontamination
Every piece of sheet metal, the upper and lower sides, have to be clean, oil, because any unclean mucosal surfaces are attached to the reliability of the metal.
After cleaning the sides of the metal and then coated with anti-light mucosal agent (Photo-resist) (This light reactive material exposure to light of a particular wavelength of light will be plasticized and produce acid as anticorrosive effect on the body no solution).
Anti-light mucosal agents can be divided into wet film (Wet-Resist) and dry film (Dry-Resist) two kinds. Wet polyester film by dipping or spraying method applied to the metal surface, the method of dry film adhesive stickers are available in metal surface, usually a dry film method is more frequently used, because it is easier to control, resolving power and precision in developing The effect is the preferred method of wet film.
2 exposure
Then, double-sided etched metal sheet folder need to be careful to put in two photographic negative (light tool), rather one-sided etching tools you need to put in under the light. The use of pressure or vacuum clamping, is stored in the appropriate exposure to light, it enables the mucosal exposure plasticize mucosa chemical light (ActinicLight) is reacted, but in the yellow light, the reaction is minimal, length of exposure time depending on the strength of the light source, the kind of mucous membrane agents factors.
Light tool technology from drafts drawn pattern with a magnification ratio of starting the accurate size correction, then retracted the original scale, this is easy to control the dimensional accuracy, based on a bottom side of the negative pattern fabrication, sheet metal and then firmly sandwiched in them, If the workpiece size small, require a certain number of pieces eclipse on a particular area of the metal sheet, we can use the images overlap discharge machine produced in duplicate negatives. As to how to ensure the absolute calibration down negative images of this process is the trick.
3 development processing
Image development work was painted by dipping or spraying polyester particular developer, the developer of the dissolved part of the mucous membrane exposure, the remaining part of the plastics.
4 Cleaning
Sheet metal cleaning method to use to remove the slag slaughter developer to ensure that there are no mucosal surface etched parts.
5 Drying: After the development of sheet metal through the second drying.
6 Etching
Sheet metal into etcher etching the part of the developer, plastics part protected not be etched.
There are several types of inhibitors, such as a mixture of ferric chloride, hydrofluoric acid and water is corrosive to cope with steel and copper alloys, some of the metal is required alkaline etchant.
When the metal surface by etching, its position will be slightly depressed mucosal side, it is etched out of the cutting edge is not hundred percent vertical.
For these reasons, the size is slightly after the etching with slight differences in image size, external dimensions shrink and expand the size of the inner circle, within a small angular position will become rounded, after correction of these problems is to go through the rear up to the expectations precision, while also correcting the size of the change in the pattern were reserved draft. Of course, the most important factor is to rely on the accumulated experience to control and accurate precision.
7 exfoliation: mucosal residue remaining after slaughter etched scrub with a suitable solvent.
8 Cleaning: steps have substantially completed, and then washed with water.
9 season: the last piece to dry, but pay attention to avoid leaving water marks.