Filter screen surface etching process

Abstract

The invention discloses a filter screen surface etching process, relates to the technical field of filter screen manufacturing, solves the problems, and adopts the technical scheme that the filter screen surface etching process comprises the following steps: S1, selecting a material suitable for manufacturing a screen, and pretreating the surface of the screen to remove oil stains on the surface of the material; s2, preparing an etching solution; s3, the part, not needing to be etched, of the surface of the pretreated screen material is covered with a protective film, and then the screen material is immersed in the etching liquid; s4, the etched screen is cleaned, and the residual etching agent is removed; s5, the protective film on the surface of the cleaned screen is torn off, and then the cleaned screen is dried; s6, the dried screen is subjected to surface polishing or other post-treatment according to needs, the effect is that the performance of the screen is improved, the service life of the screen is prolonged, and meanwhile the cost and the environmental influence are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of filter screen manufacturing, and more specifically, to a filter screen surface etching process. Background Art

[0002] Metal etching refers to the removal of the protective film in the metal etching area after exposure and development. During metal etching, the metal contacts the chemical solution to achieve the effect of dissolution and corrosion, forming a concave-convex or hollow-out molding effect.

[0003] Filter screens play a vital role in many fields such as industrial production, food processing, pharmaceutical manufacturing, and environmental protection. Screens can remove and recycle suspended solids of different types and sizes. Screen separation has the advantages of simplicity, high efficiency, and low operating costs. During the use of traditional filter screens, pollutants are easily adsorbed and accumulated on their surfaces, which not only reduces the filtration efficiency, but also may cause the screen to be blocked, increase maintenance costs and downtime, and the screen material usually needs to have a certain durability to resist long-term wear and corrosion. However, many existing materials are easily damaged in harsh working environments and need to be replaced frequently. High-performance screen materials are often expensive and costly. In order to solve this problem, people try to use various surface treatment technologies to improve the surface characteristics of the screen to solve the limitations of existing technologies, improve the performance and service life of the screen, and reduce costs and environmental impacts. Summary of the invention

[0004] In view of the shortcomings of the prior art, an object of the present invention is to provide a filter screen surface etching process with high screen performance and long service life.

[0005] To achieve the above object, the present invention provides the following technical solution: a filter screen surface etching process, comprising the following steps:

[0006] S1. Select the material suitable for making the screen and pre-treat the surface of the screen to remove the oil stains on the surface of the material;

[0007] S2. preparing an etching solution;

[0008] S3. Cover the surface of the pretreated mesh material where no etching is required with a protective film, and then immerse the mesh material in the etching solution;

[0009] S4. Clean the etched screen to remove the residual etchant. If necessary, neutralize the etched screen to ensure that no chemical reaction continues to occur on the screen surface.

[0010] S5. Tear off the protective film on the surface of the cleaned screen, and then dry the cleaned screen. You can use hot air drying or natural drying.

[0011] S6. As needed, the dried screen surface is polished, coated or otherwise treated to further improve the performance and durability of the screen.

[0012] Performance testing and evaluation: A series of performance tests are conducted on the etched screen, including filtration efficiency, durability, anti-pollution ability and chemical stability, to evaluate the impact of the etching process on the screen performance and determine the optimal process parameters.

[0013] Multi-step pretreatment: A pretreatment method combining chemical cleaning and mechanical grinding ensures that the screen surface is clean and uniform, laying a good foundation for the etching process.

[0014] Precisely controlled etching process: By precisely controlling the composition, temperature and time of the etching solution, the microstructure of the screen surface can be precisely controlled.

[0015] Selection of environmentally friendly materials: In the preparation of etching solution, environmentally friendly materials are given priority to reduce the impact on the environment.

[0016] Versatile post-processing: Provides a variety of post-processing options to meet the needs of different application scenarios and enhance the applicability and performance of the screen.

[0017] Preferably, in step S2, the formula of the etching solution is as follows:

[0018] 60g hydrofluoric acid, 10g sulfuric acid, 30g water;

[0019] Preparation method: When preparing the etching solution, mix hydrofluoric acid and sulfuric acid according to the formula, then fully mix the mixture with water and stir continuously.

[0020] Preferably, when preparing the etching solution, the mixture of hydrofluoric acid and sulfuric acid must be poured into water, and water cannot be poured into the mixture of hydrofluoric acid and sulfuric acid.

[0021] Preferably, the etching temperature is controlled at 60 degrees Celsius.

[0022] Preferably, the etching time is controlled within 5-30 minutes.

[0023] Preferably, the screen material is stainless steel or aluminum alloy.

[0024] Preferably, the post-processing in S6 includes surface polishing or coating.

[0025] By adopting the above technical solution, the invention has the following technical effects:

[0026] Improve filtration efficiency: By forming a specific microstructure on the surface of the screen, the turbulence of the fluid can be increased, reducing the deposition of particles on the screen, thereby improving filtration efficiency.

[0027] Enhanced durability: Etching removes the weak layer on the surface of the screen, exposing the more corrosion-resistant underlying material, thereby extending the service life of the screen.

[0028] Improve anti-pollution ability: The etched screen surface has a higher roughness, which helps to reduce the adhesion of pollutants and facilitates cleaning and maintenance.

[0029] Reduced maintenance costs: Since the durability and anti-pollution ability of the screen are improved, the frequency of replacement and cleaning is reduced, thus reducing maintenance costs.

[0030] Environmentally friendly: The etchant and buffer used in the present invention are both environmentally friendly materials, which reduces the impact on the environment.

[0031] Cost-effectiveness: Compared with traditional surface treatment technology, the etching process of the present invention is lower in cost and easy to scale up production.

[0032] Wide scope of application: The process of the present invention is not only applicable to stainless steel and aluminum alloy screens, but can also be extended to other metal materials, and has good versatility.

[0033] Easy to implement: The process of the present invention is simple to operate, easy to control, and suitable for implementation on an existing screen production line. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the shown positions or positional relationships, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The filter screen surface etching process of the present invention can be specifically implemented by the following steps:

[0038] Material selection:

[0039] Choose a suitable screen material, such as 304 stainless steel, which is suitable as a filter screen material because of its good mechanical properties and corrosion resistance.

[0040] Surface preparation:

[0041] The screen material is chemically cleaned using an alkaline solution containing surfactants to remove grease and dirt.

[0042] Ultrasonic cleaning technology is used to further remove tiny particles that are difficult to clean.

[0043] Perform sandblasting, using abrasive of appropriate grit size, to remove surface oxides and burrs.

[0044] Preparation of etching solution:

[0045] According to the chemical properties of the screen material, select a suitable etchant. For example, for 304 stainless steel, you can choose a mixed acid containing nitric acid and phosphoric acid or hydrofluoric acid and sulfuric acid. You can also use an etchant with the following formula.

[0046] ①12g hot water, 15g ammonium fluoride, 8g oxalic acid, 10g ammonium sulfate, 40g glycerol, 15g barium sulfate;

[0047] ② 15g ammonium fluoride, 7g oxalic acid, 8g ammonium sulfate, 14g sodium sulfate, 35g glycerol, 10g water;

[0048] When preparing etching solutions ① and ②, mix the above raw materials with 60°C hot water and stir evenly.

[0049] An appropriate amount of buffer, such as disodium hydrogen phosphate, is added to maintain the pH value of the etching solution between 1.5 and 2.5 to ensure the stability of the etching reaction.

[0050] Adjust the concentration of the etchant according to the requirements of etching depth and rate.

[0051] Surface etching:

[0052] The pretreated screen material is immersed in the etching solution.

[0053] The etching temperature was controlled at 60 degrees Celsius to ensure the uniformity and controllability of the etching reaction.

[0054] Set the etching time to 20 minutes and adjust it according to the thickness of the screen and the required etching depth.

[0055] Cleaning and Neutralization:

[0056] After etching, the screen was rinsed several times with deionized water to completely remove the residual etchant.

[0057] If necessary, neutralize the screen surface with a neutralizing solution to prevent subsequent corrosion reactions.

[0058] Drying and post-processing:

[0059] Place the cleaned screen in a hot air circulation drying oven and dry it at 80 degrees Celsius for 30 minutes to remove surface moisture.

[0060] Polish the dried screen surface using polishing paste of appropriate particle size to further improve the surface finish.

[0061] Performance Test:

[0062] The etched screens were subjected to performance tests, including filtration efficiency, durability, anti-pollution ability and chemical stability tests.

[0063] The microstructure of the screen surface was observed under a microscope to evaluate the effect of the etching process on the surface roughness.

[0064] Example:

[0065] The following is a specific embodiment to show how to apply the technical solution of the present invention:

[0066] Materials preparation:

[0067] A 304 stainless steel plate with a size of 1000mm x 1000mm and a thickness of 0.5mm was selected as the screen material.

[0068] Surface preparation:

[0069] The screen material was cleaned in an ultrasonic cleaner using an alkaline cleaning agent at a concentration of 3% for 30 minutes.

[0070] Aluminum oxide with a particle size of 0.2 mm was used as an abrasive for sandblasting to remove the surface oxide layer.

[0071] Etching solution preparation:

[0072] The etching solution was prepared according to the ratio of nitric acid: phosphoric acid: deionized water = 1:1:3, and 0.5% disodium hydrogen phosphate was added as a buffer.

[0073] Surface etching:

[0074] The mesh material is immersed in the etching solution and etched at 50 degrees Celsius for 20 minutes.

[0075] Cleaning and Neutralization:

[0076] After etching, the mesh was rinsed with deionized water 5 times for 5 minutes each time.

[0077] The surface of the sieve was neutralized with a neutralizing solution having a pH value of 7 for 10 minutes.

[0078] Drying and post-processing:

[0079] Place the cleaned screen into a hot air circulation drying oven and dry it at 80 degrees Celsius for 30 minutes.

[0080] Use 1000 mesh and 2000 mesh polishing paste to polish the surface of the screen.

[0081] Performance Test:

[0082] The filtration efficiency of the polished screen was tested using standard particles, and the particle concentrations before and after filtration were recorded.

[0083] Durability tests are performed to simulate screen wear under actual usage conditions.

[0084] Conduct anti-pollution tests to evaluate the adsorption of pollutants on the screen surface.

[0085] Scanning electron microscopy (SEM) was used to observe the microstructure of the screen surface and evaluate the effect of the etching process.

[0086] Working principle: Select materials suitable for making screens, chemically clean the screen materials, use alkaline solutions containing surfactants to remove grease and dirt, and use ultrasonic cleaning technology to further remove tiny particles that are difficult to clean. Cover the surfaces of the pretreated screen materials that do not need to be etched with a protective film, and then immerse the screen materials in the etching solution. Control the etching temperature at 60 degrees Celsius to ensure the uniformity and controllability of the etching reaction. Set the etching time to 20 minutes and adjust it according to the thickness of the screen and the required etching depth. After etching, rinse the screen with deionized water for multiple times to completely remove residual etchant. Place the cleaned screen in a hot air circulation drying oven and dry it at 80 degrees Celsius for 30 minutes to remove surface moisture. Perform surface polishing or other post-processing on the dried screen as needed.

[0087] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A filter screen surface etching process, characterized in that: The following steps are involved: S1. Select the material suitable for making the screen and pre-treat the surface of the screen to remove the oil stains on the surface of the material; S2. preparing an etching solution; S3. Cover the surface of the pretreated mesh material where no etching is required with a protective film, and then immerse the mesh material in the etching solution; S4. Cleaning the etched screen to remove residual etchant; S5. Remove the protective film on the surface of the cleaned screen and then dry the cleaned screen; S6. Perform surface polishing or other post-processing on the dried screen as needed.

2. A filter screen surface etching process according to claim 1, characterized in that: In step S2, the formula of the etching solution is as follows: 60g hydrofluoric acid, 10g sulfuric acid, 30g water; Preparation method: When preparing the etching solution, mix hydrofluoric acid and sulfuric acid according to the formula, then fully mix the mixture with water and stir continuously.

3. A filter screen surface etching process according to claim 2, characterized in that: When preparing the etching solution, you must pour the mixture of hydrofluoric acid and sulfuric acid into water, and you cannot pour water into the mixture of hydrofluoric acid and sulfuric acid.

4. A filter screen surface etching process according to claim 1, characterized in that: The etching temperature is controlled at 60 degrees Celsius.

5. The filter screen surface etching process according to claim 1, characterized in that: The etching time is controlled within 5-30 minutes.

6. A filter screen surface etching process according to claim 1, characterized in that: The screen material is stainless steel or aluminum alloy.

7. A filter screen surface etching process according to claim 1, characterized in that: The post-processing in S6 includes surface polishing or coating.