Stainless steel etching process

- Apr 13, 2018 -

Stainless steel etching process

The  principle of the chemical etching and graphic processing on the surface  of stainless steel is to cover the portion of the surface of the  stainless steel etched plate that is not etched by silk screen printing  with an acid-resistant or alkali-resistant ink, thereby shielding the  etching solution and allowing the etching solution to contact only the  portion to be etched. The surface, so as to  achieve the purpose of etching into graphic, detailed classification can  also be divided into positive and negative plate etching, positive  etching is to leave the pattern to be processed, the other large surface  of the total erosion, so that the pattern Protrudes the surface and presents a micro-relief effect. The  opposite of the negative plate etching is to etch away the portion of  the pattern to be recessed to achieve the purpose of etching.

The  stainless steel etched plate process sequence is usually formed by the  following parts: stainless steel surface purifying, printing  acid-resistant ink, etching, removing film, baking, painting, baking,  peritoneal, shearing, and the like.

64x64            64x64

Usually the  surface of stainless steel is 8K smooth surface or straight-line  drawing surface, there are two kinds of 201 and 304 stainless steel, in  the production and sales process, usually the surface is sealed with a  layer of protective oil ester, and to make the corrosion layer can  adhere well, The oil layer must be removed. The deoiling  process can be removed by using electricity to clean the oil, gasoline  or chlorinated solvent, alkali and surfactant boiling, etc., in which  the anode and anode mixed electricity can relieve the oil production  effect. It is best to remove trace amounts of oil and  grease on the surface after wiping with solvent to remove oil. It is  best to further remove residual oil by electrolysis or caustic so as to  ensure good adhesion of the corrosion layer. The effect of degreasing  directly affects the quality of the post-processing and quality of the  finished product. .

In  addition to the finished oil, an anti-corrosion layer is formed on the  surface of the stainless steel, and its practice is usually divided into  three types. One method is to use a self-adhesive pattern as a resist  layer, and a computer is used to engrave the pattern characters on the  self-adhesive pattern. A  good pattern of self-adhesive is stuck on the surface of stainless  steel, and the part of the adhesive to be removed is manually removed to  expose the metal surface, and the unremoved adhesive is used as a  resist layer. This  method is more suitable for the processing of simple patterns or small  text, the requirements are not very high occasions, its operation is  simple, without too much professional skills, processing costs are also  low. However, in the case of a complicated pattern, a large number of  characters, or a high etching requirement, due to its process  limitations, the processing cost is unwieldy and it is difficult to meet  the accuracy requirements.

Another  method is to make a resist layer by screen printing, that is, screen  printing resist etching ink, and the ink is used to mask the unetched  portion to obtain the purpose of shielding the acid. This method is more  suitable for the same figure with less precision requirements. The  advantages of processing large batches of etching are that the  processing speed is high, the cost is low, and the edges of the picture  are easy to be neat and are suitable for batch processing. The  deficiency is the need for screen printing skills. It is required that  there be no pinholes or blemishes after printing. If there are a large  number of pinholes, the phenomenon of blemishes will have to be  reprinted. Due to the need to make silk screens before printing, it is not suitable for small-lot productions.

Another  method is to lithographically create a resist layer, cover the  stainless steel surface with a special photosensitive ink, and form an  anti-corrosion coating on the surface of the stainless steel through  photolithography, development, fixing and the like. The advantages of  the pattern have high accuracy and can be achieved with zero. The  error, which is exactly the same as the designed pattern, is the  preferred processing method that requires high processing precision and  accurate sheet-to-plate mapping. For small-volume operations, the cost  is lower than silk screen printing due to the elimination of  screen-making operations. . The inadequacies are the need for special screen printing and copying  equipment and high professional skills, and the large number of jobs for  the same pattern, its speed is significantly lower than screen  printing, so that the overall cost of doing business increased.

The  above three kinds of methods are common methods for making a resist  layer, which can be selected according to the actual conditions during  the actual operation process, or even applied in combination to achieve  the purpose of maximizing the efficiency.