The structure of the air filter is relatively simple, while the choice of materials is more abundant.
Commonly used filter materials for air filtration include:
Air filter paper (normal, flame retardant), fiberglass, stainless steel mesh, polyester filter material (normal polyester fiber, waterproof polyester, anti-static polyester, etc.), felt, fiberglass felt, etc.
What Does The Industrial Air Filter Manufacturer Need?
Many factors need to be considered in the manufacture of air filter.
- Air volume (air cloth ratio)
- Air resistance (pressure drop)
- Dust concentration
- Filtration accuracy (the size of the dust to be filtered)
- Filtration efficiency (air cleanliness)
- Ambient temperature
- Whether it contains corrosive impurities
- Work pressure
- Size, height
- The nature of dust (flammability, explosiveness, etc.)
It is necessary to select the appropriate air filter according to the use effect, environmental requirements, and specific requirements for all equipment.
These influencing factors should be fully considered especially for custom-produced air filter elements.
Common Filter Media For Air Filter Element
Paper Dust Filter
This kind of air filter material made of natural wood pulp fiber has poor strength and is not resistant to water. It is suitable for dust filtration with low water content in the air.
However, by combining with other materials, a flame-retardant filter element can be made, which can adapt to high-temperature environments.
As the filter material of the air filter element, fiberglass can play a role in separation. It can filter impurities other than solid particles such as oil and water in the air (including solid particles).
It has the advantages of extremely high filtration accuracy, high-temperature resistance, and long service life.
Stainless Steel Metal Mesh Air Filter
The filtration accuracy of stainless steel metal mesh can reach 5μm, so it can meet the needs of many special industries.
Advantages of stainless steel metal mesh air filter:
a, no filter material falling off;
b, high temperature, and low-temperature resistance. Corrosion-resistant, no chemical reaction;
c, Large filtration area, high mechanical strength, small pressure loss;
d, easy to reverse clean, long service life.
Polyester Filter Material
Good wear resistance, it can withstand the pulse blowback of airflow better than other materials (except stainless steel metal mesh), and can be cleaned repeatedly.
Good chemical stability, corrosion resistance, and high-temperature resistance. It is often combined with other materials to make filter materials with different functions.
It is a kind of filter material belonging to cloth materials, which can be used to filter gas, water, oil, etc.
How to Choose Interchange Filter?
According to the air filter model requirements, you can quickly select a suitable replacement filter element.
This is because the standard air filter has fixed data parameters in all aspects and does not need to be changed, it only needs to be made according to the original filter design.
But pay attention to distinguish the quality, the appearance can be exactly the same, the key is to have effective filtering performance, it can be compared with the original filter element to make a preliminary judgment on the quality of the replacement filter element.
- Is there an unpleasant smell?
- Whether the density of pleats meets the requirements
- Is the height of pleats meets requirements (the width between the inner and outer diameters)
- Whether the inner diameter and outer diameter meet the standard
- Height of filter element
- Is the structure tight enough and not easy to loosen and deform
- The sealing structure is chipped or incomplete
- Is the weight of the filter element sufficient?
- The roughness of filter element workmanship
These surface problems can make a preliminary judgment on the quality of the filter element.
But it is impossible to accurately determine whether the filter element has excellent filtering performance.
This needs to be tested.
Know More About The Air Filter
The basic misunderstandings about the filter element, such as the size of the filter accuracy, the problem of materials, etc., will not be emphasized too much.
Here are a few issues that are easily overlooked.
1，Filter quality problem
During use, if the filter element has air leakage, the differential pressure resistance reading has abnormal growth, etc., what needs to be considered is not only the quality of the filter element but also the size of the interface part of the filter device, which requires custom processing.
For example, if the quality of the static pressure air supply port is not good enough, it will cause a loose seal between the standard replacement filter element and the air supply port.
If you encounter this kind of problem, you need to accurately measure the equipment to eliminate the possibility of failure.
2，The air filter can be cleaned and reused
Most of them can be blown back to extend the number of uses (instead of extending the service life), however, in some cases, cleaning is not recommended.
It should be replaced directly.
There are four reasons.
a. Advanced clean room
(such as some air filtration equipment for pharmaceuticals, electronic equipment, etc.)
These filtering equipment have higher requirements for cleanliness. It has little effect on anti-cleaning and may cause secondary pollution.
b. Equipment with precision structure
(such as air compressor, etc.)
The back-end filtration systems of this filtration equipment are equipped with filters that are more expensive and cannot be used to increase the number of times of use through cleaning.
Moreover, the filter element protection system is relatively sophisticated, expensive, and difficult to maintain, in order to save the replacement cost by cleaning the air filter is obviously not cost-effective.
c. If the air filter is not too dirty, it does not need to be replaced.
If the operating environment of the equipment is very clean, it can be replaced after a period of time has passed the replacement period, or the operating environment is very bad, but the air filter is much cleaner than imagined.
You should be alert at this time.
It is necessary to judge whether the air filter element has effective filtering capacity, otherwise, it must be replaced in time.
d. No reverse cleaning system
If you need to manually remove it and clean it manually, it needs to consider whether there are strict requirements for cleanliness standards.
If the requirements for cleanliness are very strict, it is best to replace them directly, because the equipment is not equipped with a pulse backwash, etc, clean pressure and uniformity cannot be ensured and will cause more dust pollution inside the filter element.