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.
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.