Resource Center

The particulate matter from automobile exhaust and industrial chimneys poses a huge threat to both humans and the environment. There are problems related to gas pollution in countries around the world. Particulate matter pollution is particularly dangerous to humans as it can damage the central nervous system and respiratory system. Researchers have been working hard to build better air filters to address air pollution and improve environmental quality. However, so far, the air filters under development have performed poorly in harsh environments, with more challenges posed by high temperatures, high humidity, or environments that require long-term filtration. In order to build a better air filter, the team of scientists designed a three-dimensional particle capture device. They used a simple sacrificial template method to create a polydimethylsiloxane (PDMS) sponge. Next, they applied a polydopamine (PDA) coating onto the sponge skeleton using an in-situ loading method. Then, a large number of ZIF-8 particles were grown on the PDA coating. ZIF-8 is a metal organic framework, which is a type of porous material with diversity in structure and chemical tunability. Metal organic frameworks have shown great potential for applications in gas adsorption and air filtration. The abundant pores in the composite sponge provide good airflow, and ZIF-8 particles enhance the filtration performance of the sponge. The particulate matter from automobile exhaust and industrial chimneys requires filters to have high temperature and high humidity resistance, as well as good mechanical performance. The team tested their sponge under high temperature (250 degrees Celsius/482 degrees Fahrenheit) and high humidity (90% relative humidity) conditions simulating an industrial high-temperature environment. The test results under high temperature and high humidity conditions indicate that the composite sponge has great potential for application in the industrial field. Further testing of the composite sponge replicated the conditions used for filtering automobile exhaust. Due to its easy shaping and structural stability, sponge can be easily used in different scenarios as needed. So researchers prepared composite sponges to adapt to exhaust pipe openings. In the automobile exhaust test simulating the normal operation of a car, the particle removal efficiency of the composite sponge reached over 99%. Even after 65 hours of filtration, the composite sponge still maintains excellent performance. Professor Lai Yuekun from Fuzhou University said, "This study provides a new idea for designing 3D high-efficiency air filters that can adapt to harsh environments. Due to the good structural stability and easy shaping of composite sponge, it is suitable for various applications from car exhaust pipes to industrial chimneys to kitchen fans In the next step, our research team will explore gas filters that can adapt to higher temperatures and methods for treating certain components of air pollutants, rather than just filtering particulate matter. Through this approach, researchers may expand the application scenarios of gas filters while increasing their potential for practical applications. Our ultimate goal is to achieve a gas filter that can be used in various environments and an efficient filtering material with various functions, "Lai said.

With the demand for air environmental protection, air filters have become popular in various aspects of factories, enterprises, and daily life. High efficiency filters belong to terminal filtration and play an important role in the entire purification system. Due to their wide range of applications, the classification of fresh air high-efficiency filters is very complete. So, is the use of air filters harmful to human health in the workshop environment? Let me explain in detail one by one:

The high-efficiency filter for fresh air is mainly used to capture particles, dust, and various suspended solids below 0.3um. It uses ultra-fine glass fiber paper as the filter material, adhesive paper, aluminum film and other materials as the dividing plate, and is glued with wooden frame aluminum alloy. It uses special silicone, odorless, surface will not be hard, and there will be no cracks over time. It has stable chemical properties, corrosion resistance, can absorb the stress caused by thermal expansion and contraction without cracking, moderate softness and hardness, and good elasticity recovery.

The use of high-efficiency filters for fresh air filtration is beneficial to the human body. Many employees who often work in clean rooms often have questions: Will the air inside the clean room have an impact on the human body? The answer is of course negative. We all know that the air in the cleanroom is mainly filtered by the high-efficiency air filter at the end before being sent indoors. The air referred to by employees mainly refers to the air filtered by the high-efficiency air filter.

The high-efficiency filter itself is made of extremely fine glass fiber paper, and its filtration accuracy can reach 99.99% to filter over 0.3um. This means that most visible and invisible dust, including bacterial carriers, in the atmosphere are filtered out before being sent to the cleanroom. The air absorbed by employees is actually much cleaner than the outside world. Therefore, overall, high-efficiency air filters are beneficial to human health.

Air filters are increasingly recognized by more and more people, as they improve air quality and ensure people's health. They have been widely used, such as in industries such as medicine and food, which cannot do without various efficient filters.

What are the initial and intermediate resistances of the high-efficiency air filter on FFU?

The initial resistance of the high-efficiency filter on FFU is 70-100Pa at a wind speed of around 0.45m/s. The initial resistance of high-efficiency filters from different manufacturers varies The initial resistance of a high-efficiency filter is generally calculated at 100Pa.

The filters on FFUs are generally selected for high efficiency, with customers mostly choosing H13-U16 for efficiency. The final resistance is usually 2-3 times the initial resistance, and there is no strict regulation on the final resistance, which is mainly determined by the environment. There are several ways to replace FFUs now, some of which are to remove the entire FFU and replace the filters inside; In some places, there is actually no need to use FFU, just the kind without a motor. Its thickness is thinner than FFU, and there is a TM RII product of the same kind. When replacing it indoors, people can directly take it out from under the ceiling, which is very convenient.

The initial resistance on FFU corresponds to different thicknesses of filters, usually as follows:

69mm   105Pa(H13)   110(H14)   120(H15)   140(H16)

93mm     75Pa(H13)   80(H14)    90(H15)    110(H16)

Initial effect (capture rate of 90%): 80-180 Pa (G3, G4). It is recommended to increase the final resistance to three times the initial resistance.

Intermediate efficiency (F5, F6, F7, F8, F9) (colorimetric method)

Bag type: 50-200, recommended final resistance of 250 Pa;

Box type: 40-150 Pa, recommended final resistance of 300 Pa;

Plate type 100-175 Pa, recommended final resistance of 375 Pa.

Efficient (mpps) (H13, H14, U15, U16): 60-140 Pa.

The initial resistance of a filter is closely related to the wind speed and the thickness of the filter material. Generally speaking, when the wind speed is high, the resistance is high, and when the filter material is thick, the resistance is low (except for bag filters).

As an effective filtering medium, filter paper has been widely used in various fields. According to the different types of fibers that make up the filter paper, the performance and purpose of the filter paper also vary. There are ordinary filter paper used for general occasions, glass fiber filter paper used for high temperatures, and polypropylene filter paper used for ultra clean applications. According to whether the filter paper is impregnated with glue, it can be divided into two categories, namely impregnated filter paper and non impregnated filter paper. Immersion filter paper is divided into cured filter paper and non cured filter paper. The following mainly introduces impregnated filter paper used in industry.

This provides an effective means of removing as many pollutant particles as possible from liquids and gases, with minimal resistance limitations. It has therefore been widely applied. In other words, the filter must prevent the filtered system from being damaged by harmful particles while allowing sufficient fluid to pass through the filter to avoid creating voids in the pump, cylinder, and combustion chamber. This imposes strict requirements on the filter material.

According to the different application scenarios of each filter paper, its basic weight, thickness, and apparent density also vary. Generally speaking, filter paper used for diesel has higher accuracy and lower apparent density. The application of fiberglass reduces the apparent density of filter paper. Therefore, while maintaining the same filtration accuracy as all wood fiber filter paper, its pollutant holding capacity has been greatly improved.

What are the five major characteristics of an air shower room 1. Automation control: The system adopts PLC intelligent control means, and the LED display screen on the control panel can correctly display the operation status of the air shower, the interlock status of the two doors, the progress of the air shower cycle, and the delayed door opening status. And it is equipped with photoelectric sensors and a one-way channel air shower room. When entering from a non clean area, the door will be closed and an infrared sensor will be used to blow air when someone is present. After blowing air, the door will be locked and can only be exited from the air shower room; 2. Humanized operation: Humanized control panel design, clear indicator lights, providing users with clear and correct air shower process instructions. Soft key touch type time relay, LED display and setting of shower time, adjustable in the range of 10-99s, users can adjust the shower time according to the differences in the external environment of the shower room; 3. High cleanliness and high wind speed: Adopting a two-stage filtration system of American AAF primary and high-efficiency filters, with no partition and low resistance high-efficiency filters, the filtration efficiency is 99.99%, ensuring the purification level. Equipped with a fully stainless steel multi angle adjustable nozzle and a double volute outer rotor high air volume low-noise fan, the wind speed at the nozzle outlet is over 25m/s, and the wind speed blowing onto the human body is over 18m/s; 4. Modular structure: The air shower box adopts a modular design scheme, which can be assembled into various lengths of air shower sizes according to actual needs. A wind shower room consists of one or more air shower units. For large volume air shower equipment, it can be divided into multiple modules, making production, transportation, and installation particularly convenient and fast; 5. High performance and high sealing: using imported electronic components, stable and reliable operation performance, advanced noise reduction and silencing device system, and using EVA sealing material, high sealing performance.

1. Affordable. The primary filter is the primary filter of the filtration system, mainly used to filter dust particles larger than 5 μ m. Therefore, the price of primary filters is relatively low compared to other filters.

2. High universality. This type of efficient filter is commonly used for primary filtration in air conditioning and ventilation systems, as well as for simple air conditioning and ventilation systems that require only one level of filtration,

3. Lightweight, the weight of the primary air filter is very light, mainly because the materials used in the primary air filter usually have the characteristics of low density and high stability, which makes it not only sturdy and durable, but also very easy to install and replace. The outer frame is usually made of stainless steel or aluminum alloy material. Stainless steel material has good stability and corrosion resistance, and can adapt to different working environments. Compared with stainless steel material, aluminum alloy material is more expensive but lighter in weight.