Why track etched membrane is the most accurate membrane filter material

How to achieve the filtration of microparticles with equal diameter specifications, or the filtration of particles with specific directional sizes, it is recommended to use track-etched membranes. The main reasons are based on the following points:

Production Process

The orbital etching membrane adopts the method of heavy ion impact and chemical etching. Its advantage is that the shape, size and specification of the micropores can be controlled during production, and it can ensure that each filter hole is independent and the tolerance range of the hole Small, only less than 10%, which is also the characteristic and advantage of the chemical etching process. In addition, the pore density can also be adjusted according to actual needs, and the pore density can reach 10⁴-10¹¹ per square centimeter, so that the high-density pore diameter can fully meet the flow requirements of gas and liquid, and the pores are uniform and dispersed.

Micropore shape

The cylindrical through-holes ensure the smooth filtration of particles. Compared with other fibrous materials, it is more suitable for the passage of particles. Even if the small amount of adherents produced by long-term use, due to its smooth inner wall, it can also be removed during backwashing. Easy to remove.

Tolerance

The micropore processing of the orbital etching film is completely processed in a controllable state, so the processing error is also extremely small, and it uses PET/PC material with strong stability and high performance, so that both processing and use can ensure Its stable tolerance range, but for other fiber-based materials, the tolerance size of the hole is strictly meaningless, because the shape of the hole produced by this type of material is also irregular, and the size range of the hole diameter is Large, in this case, its tolerance size is very wide.

Filtration accuracy

The advantage of the filtration accuracy of the track-etched membrane is that it can completely customize the membrane pore size according to the size of the particles, especially for the scene where the size of the filtered particles is very strict, such as the grinding used in semiconductor chip grinding Liquid requires that the particles must have a uniform and uniform material diameter. If it is too large, it will cause grinding scratches, and if it is too small, it will also affect the grinding effect. Therefore, the requirements for the selection conditions are very strict, and the track etching Membranes would be perfect for this. Other membrane materials are slightly inferior to track-etched membranes because the pore size of this type of membrane is relatively wide, and the filtered particle size is too large to affect the quality.

Filter effect

Due to the high porosity of the track-etched membrane, even in the case of an extremely small pore size, it can ensure very smooth filtration at a low working pressure, while other filter membranes such as fibers need to filter extremely small particles, such as 0.03-0.05um, more laminates need to be added, even if the filtration requirements can be met, then the required pressure is far greater than that of the track-etched membrane, and the smoothness of the filtration is also low.

Through the above review, it can be seen that track-etched membrane is the best choice for precise filtration, especially the semiconductor wafer grinding mentioned in the article, including other high-precision filtration industries, scientific research, medical treatment, food industries, etc.