Filter bags provide immense convenience for air filtration in paint booths as well as central air processing systems. These filters are capable of filtering large quantities of dust and other debris from the air, thereby providing a cleaner environment. Their usage has also been known to reduce the overall cost of operations for ventilation systems.
But amidst the various options that exist for filter bags, how do you determine which one is suitable for your needs? Let us find out.
Filter Size
You need to get appropriately sized bag filters for your requirement. In order to get the perfect size, first analyse the space where the filter is to be installed and also take into consideration the specific purpose of the filter. With variations in size, you get different flow rates and filtration capabilities. There is no sense in buying a large sized filter for an applicable where a smaller sized filter would suffice. Once you have selected the size of the filter, you can proceed with materials and construction determination.
Materials / Fabrics
Polypropylene, polyester, Nylon and Nomex are the most common materials used in the construction of industrial bag filters. The bags, however, are made from either mesh or felt to store the filtered contents safely. Filter bags made from Polypropylene and felt are used commonly due to their resistance to chemical reactions induced by mineral acids, organic acids, alkalis, organic solvents, and microorganisms (up to a temperature limit of 200 F). The best part about this particular bag filter is that the costs for the entire product is rather affordable and does not compromise on quality for achieving the desired affordability.
Construction of the Bag Filter
Sewn construction or welded construction are the two most popular ways of manufacturing filter bags. Speaking about the sewn construction, there are those who prefer this due to the perception that a mechanically sown seam provides greater durability and strength to the bag. Now if the seam fails to hold together, then the bag has a high risk of breaking with possibility of dirt entering the downstream flow.
There is also the concern that the holes made by the sewing needles could allow unwanted debris / materials to pass through the filter bag but this can happen only if the micron rating is not complied with.
Silicon contamination is also a major concern for those who use filter bags. As a precaution, good quality bags are made from silicon free material with the sewing threads also being free of silicon. This helps to keep the filtrate safe while preventing contamination.
In welded construction, the fabrics are fused together so that the fibres form a bag. This not only helps to secure the sealing ring but it also eliminates the existence of holes, thereby increasing the quality of the bag filter. Due to the complete absence of the holes, there is no possibility by which any particle may pass through the seam. Modern fabric welding technologies have also made welded seams as strong (if not stronger) than sewn construction filter bags.
While evaluating the construction of the filter bag, you also need to consider the sealing ring which is placed near the opening of the bag and it helps to secure the contents inside. The material of the ring (usually metal or plastic) is important not only for chemical compatibility, but also for disposal purposes. If the bag is being disposed through incineration, then choosing a plastic ring would help in proper disposal with minimal residual components remaining behind.
Micron Ratings
Filter bags are generally available in micron ratings ranging 1/2 to 1200. However, the bags will allow a certain percentage of particles that are larger than the specified micron rating, to pass through. This cannot be considered as a major flaw as in most applications, the bags are subjected to various tests which help in determining the micron rating that is most effective in delivering the desired results. This is the case with nominal rating bags. But if you wish to procure absolute rating bags, then 99.9% of the rated size particles would be stopped effectively, but the overall cost of the bags can cost almost 30 times more than the costs of a nominal rating filter bag. So give due consideration to all of these factors before you decide upon the filter bag of your choice. You can get a wide range of paint booth filters at Profilt.net.
But amidst the various options that exist for filter bags, how do you determine which one is suitable for your needs? Let us find out.
Filter Size
You need to get appropriately sized bag filters for your requirement. In order to get the perfect size, first analyse the space where the filter is to be installed and also take into consideration the specific purpose of the filter. With variations in size, you get different flow rates and filtration capabilities. There is no sense in buying a large sized filter for an applicable where a smaller sized filter would suffice. Once you have selected the size of the filter, you can proceed with materials and construction determination.
Materials / Fabrics
Polypropylene, polyester, Nylon and Nomex are the most common materials used in the construction of industrial bag filters. The bags, however, are made from either mesh or felt to store the filtered contents safely. Filter bags made from Polypropylene and felt are used commonly due to their resistance to chemical reactions induced by mineral acids, organic acids, alkalis, organic solvents, and microorganisms (up to a temperature limit of 200 F). The best part about this particular bag filter is that the costs for the entire product is rather affordable and does not compromise on quality for achieving the desired affordability.
Construction of the Bag Filter
Sewn construction or welded construction are the two most popular ways of manufacturing filter bags. Speaking about the sewn construction, there are those who prefer this due to the perception that a mechanically sown seam provides greater durability and strength to the bag. Now if the seam fails to hold together, then the bag has a high risk of breaking with possibility of dirt entering the downstream flow.
There is also the concern that the holes made by the sewing needles could allow unwanted debris / materials to pass through the filter bag but this can happen only if the micron rating is not complied with.
Silicon contamination is also a major concern for those who use filter bags. As a precaution, good quality bags are made from silicon free material with the sewing threads also being free of silicon. This helps to keep the filtrate safe while preventing contamination.
In welded construction, the fabrics are fused together so that the fibres form a bag. This not only helps to secure the sealing ring but it also eliminates the existence of holes, thereby increasing the quality of the bag filter. Due to the complete absence of the holes, there is no possibility by which any particle may pass through the seam. Modern fabric welding technologies have also made welded seams as strong (if not stronger) than sewn construction filter bags.
While evaluating the construction of the filter bag, you also need to consider the sealing ring which is placed near the opening of the bag and it helps to secure the contents inside. The material of the ring (usually metal or plastic) is important not only for chemical compatibility, but also for disposal purposes. If the bag is being disposed through incineration, then choosing a plastic ring would help in proper disposal with minimal residual components remaining behind.
Micron Ratings
Filter bags are generally available in micron ratings ranging 1/2 to 1200. However, the bags will allow a certain percentage of particles that are larger than the specified micron rating, to pass through. This cannot be considered as a major flaw as in most applications, the bags are subjected to various tests which help in determining the micron rating that is most effective in delivering the desired results. This is the case with nominal rating bags. But if you wish to procure absolute rating bags, then 99.9% of the rated size particles would be stopped effectively, but the overall cost of the bags can cost almost 30 times more than the costs of a nominal rating filter bag. So give due consideration to all of these factors before you decide upon the filter bag of your choice. You can get a wide range of paint booth filters at Profilt.net.