Can PTFE filter bag filter tiny particles?

Can PTFE filter bag filter tiny particles?
Polytetrafluoroethylene (PTFE) filter bag is an excellent filter material, which can be used to filter small particles. In this 1000 words, we will discuss how PTFE filter bags filter small particles and their applications in different fields.
First, let's understand the structure and characteristics of PTFE filter bag. PTFE is a kind of polymer compound, which has good heat resistance, corrosion resistance and good barrier performance. It is a filter bag composed of nano fiber network formed by polytetrafluoroethylene monomer. This nano scale fiber network can form a dense impermeable barrier to prevent the passage of small particles, while allowing gas or liquid to pass through.
The filtration mechanism of PTFE filter bag can be divided into three steps: interception, diffusion and adsorption. Interception means that when particles move along the path of air flow or liquid flow, they will be blocked by the filter bag fiber net and cannot pass through. This is the main filtration method, especially suitable for larger particles.

Diffusion refers to the random diffusion of small particles under the action of collision, motion and thermal shock, and the movement between the filter bag fibers. This diffusion process is an important way for small particles to pass through the filter bag. Because the fiber of PTFE filter bag is very small, the probability of collision and diffusion of small particles between fibers is greatly increased, which increases the filtering effect.
Adsorption refers to the tiny particles adsorbed on the fiber surface. The surface of PTFE filter bag has strong hydrophilicity, and small particles can be adsorbed on the surface of the filter bag. This adsorption phenomenon further increases the capture efficiency of particles.
Because the filtration mechanism of PTFE filter bag combines many ways, it shows excellent filtration performance and can filter small particles. According to the experimental data and application experience, PTFE filter bags can usually filter small particles with particle diameter between 0.1 μ m and 1 μ M. These micro particles include bacteria, viruses, cells, dust, etc.
PTFE filter bag is widely used in many fields because of its ability to filter small particles. Here are some common application areas:
1. air filtration: PTFE filter bag is widely used in air filtration system to remove particles and harmful substances in the air. These systems are usually used in hospitals, laboratories, electronic factories and other environments to ensure the purity of the air and the health of employees.
2. flue gas purification: in the industrial flue gas purification system, PTFE filter bag is used to remove the small particles generated in the combustion process, including dust, metal smoke, sulfur dioxide, etc. This helps to reduce air pollution and protect the environment.
3. liquid filtration: PTFE filter bags can also be used for liquid filtration, such as water treatment, baby milk powder production, pharmaceutical manufacturing and other industries. It can remove microorganisms, particles, heavy metals and other harmful substances in water to ensure the safety of water quality.
4. medical application: PTFE filter bag can be used to filter microorganisms and particulate matter in the air of the operating room during medical operations, and protect the cleanliness of the operating environment. It can also be used for microbial filtration in the preparation of drugs.
In general, PTFE filter bag is an effective filter material which can filter small particles. Its filtration mechanism combines interception, diffusion, adsorption and other methods to effectively remove micro particles, including bacteria, viruses, dust and so on. Because of its filtration performance, PTFE filter bags are widely used in air filtration, flue gas purification, liquid filtration and medical applications.