Filter bags are extensively employed as an economical filtration option in a variety of industries, they are well-suited for the clarification or separation of diverse liquids and gases.
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When filter bag is placed in housing, it is good at capturing impurities in liquids, effectively increasing fluid use and reducing costs.
In this guide, you will understand the material of filter bag, their characteristics, and how to choose the right filter bag for your application.
When utilizing a filter bag for filtration of gases or liquids, the primary consideration revolves around material selection. Various materials possess distinct functions and characteristics.
Optimal material selection is pivotal in reflecting filter bag's intended function and durability, thereby ensuring the attainment of the highest filtration efficiency.
Filson offers a wide range of filter bag material selection, including polypropylene, polyester, nylon, stainless steel, PTFE, PPS, glass fiber, aramid and cotton.
When the removal of liquid deposits, adhesive particles, and impurities is required in industries like the water supply system and food & beverage, the top choice is polypropylene filter bag. Comprising 100% polypropylene, this filter bag conforms to FDA food-grade standards.
Furthermore, polypropylene filter bag exhibits outstanding corrosion resistance and is compatible with a wide range of corrosive solutions, including organic solvents, acids, bases, and oils. It also boasts high flow rate, with achievable speed ranging from 20m³/h to 40m³/h.
Pros of Polypropylene Filter Bag
Cons of Polypropylene Filter Bag
Polyester is created through the esterification of dicarboxylic acid and diol. It is then transformed into filter bag by subjecting it to multiple needle punctures and appropriate winding to create a structure where the fibers are not uniform but disorderly. This process includes repeated piercing with barbed needles to enhance fiber strength.
The polyester filter bag falls into the category of normal-temperature dust removal bags, designed for prolonged use in environments with temperatures below 150'. It exhibits high dust removal efficiency and maintains a low emission concentration.
Pros of Polyester Filter Bag
Cons of Polyester Filter Bag
When it comes to the filtration of sizable particle impurities or applications requiring pre-filtering and coarse filtration, opting for a nylon filter bag is a sensible decision.
These bags are constructed from high-strength monofilament or compound silk nylon mesh, offering an economical solution that can be easily cleaned and reused.
Nylon filter bag is widely used in primary filtration of raw water, automobile oil removal, circulating water system, anticorrosive paint, reclaimed water treatment and other fields.
Pros of Nylon Filter Bag
Cons of Nylon Filter Bag
If you are looking for a filter bag that is more durable than plastic, stainless steel is your first choice. It has wire mesh structure made of premium stainless steel 304/316L.
Due to the particularity of metal material, stainless steel filter bag has excellent corrosion resistance and high mechanical strength. It can maintain high filtration efficiency at 480'.
With rigid open hole structure, stainless steel filter bag can maintain stable high filtration efficiency of 99.9%, which is widely used in food&beverage, wastewater industry, chemical industry, oil refinery and other fields.
Pros of Stainless Steel Filter Bag
Cons of Stainless Steel Filter Bag
Crafted from 100% top-grade polytetrafluoroethylene (PTFE) fibers, PTFE filter bag is tailored for demanding industrial air filtration needs in harsh chemical environments, particularly at elevated temperatures.
PTFE filter bag demonstrates outstanding resilience against acids, alkalis, hydrolysis, and oxidation, consistently delivering high-performance results up to 260', withstanding occasional temperature spikes up to 285'.
Thanks to its exceptional high-temperature resistance, PTFE filter bags find extensive application in a range of industries, including combustion boilers, waste incineration, titanium dioxide production processes, and post-combustion treatments, etc.
Pros of PTFE Filter Bag
Cons of PTFE Filter Bag
PPS, also known as polystyrene sulfide, is a new type of thermoplastic resin material, which can withstand 200' high temperature, and can meet the needs of flue gas purification in most fields, such as waste incinerators, coke ovens, kilns, chemical plants and so on.
PPS filter bag boasts a fibrous structure, outperforming other high-temperature, acid-resistant, and alkali-resistant filter bag products. It retains its exceptional performance even in the harshest of environments, ensuring an extended service life that meets or exceeds expectations.
Pros of PPS Filter Bag
Cons of PPS Filter Bag
The raw material of glass fiber filter bag consists of inorganic fibers with SiO2 as the primary component. It has excellent high heat resistance, stable structure and high tensile strength.
These fibers are created by melting glass at temperatures ranging from °C to °C, drawing them from the molten state, and rapidly cooling them. This process results in filter bag's remarkable resistance to high-temperature of 280'.
Glass fiber filter bag boasts exceptional wear resistance, waterproofing, and oil repellency. It finds extensive application in industrial settings for tasks such as dust control, addressing air pollution, and recovering valuable dust, among other diverse fields.
Pros of Glass Fiber Filter Bag
Cons of Glass Fiber Filter Bag
Aramid, commonly recognized as Nomex, boasts exceptional heat resistance. The aramid filter bag is crafted from 100% high-strength aramid long fibers, following pretreatment and thermoshaping procedures.
In contrast to alternative heat-resistant materials, aramid filter bag offers a cost-effective solution with superior performance. This makes them the preferred choice in high-temperature industries such as power generation, coal boilers, incineration, chemical processing, mineral processing, asphalt mixing, steel production, and more.
Pros ofAramid Filter Bag
Cons of Aramid Filter Bag
Constructed entirely from 100% pure cotton, cotton filter bag is a reliable and high-grade solution for dust collection. It exhibits outstanding permeability and superior filtration efficiency, especially in dry environments.
Operational within temperature range of 82', cotton filter bag maintains a permeability rating of 20-25 CFM @ 0.5' gauge, effectively capturing over 90% of airborne impurities. This makes it an economical choice for filtration.
Furthermore, the cotton filter bag boasts a flame-retardant surface, rendering it suitable for a wide range of dust removal applications, including clean rooms, air purification, woodworking, and the cement industry, among others.
Pros of Cotton Filter Bag
Cons of Cotton Filter Bag
As a key decision of smooth production of factory, the choice of filter bag material is very important. We need to analyze according to the specific situation and demand of different industries to find the corresponding filter bag that can maintain normal production demand.
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This section lists the several commonly used areas for filter bags and analyzes the factory environment and suitable filter bag materials one by one.
In metal industry, filter bags are often used for dust collection, emission gas or product recovery. Due to the particularity of metal production, it generally needs to be carried out in high temperature environment, so the filter bags used in metal industry are high heat resistant.
When choosing filter bags for metal industry, temperature is the first factor to consider, followed by chemical exposure and legality, to determine the most suitable filter bags for specific applications in the metal industry.
The materials of filter bag suitable for metal industry are glass fiber PTFE, aramid, stainless steel, etc., which can efficiently capture impurities and dust in air in environment of 200' to 400', and the polyester filter bag can be used to collect normal temperature gas in steel mills.
In the process of glass production, it is very important to emit particles and maintain clean working environment, which needs to be completed by the filter bags.
The selection of filter bag material also needs to consider many factors, such as glass production process temperature, operating environment and impurity type, etc.
Considering the environmental temperature, chemical composition of dust and other production requirements, we can choose the corresponding filter bags that can withstand high temperature and chemical corrosion to ensure the normal production.
PP and PTFE have excellent chemical resistance, and PTFE can be specially used to adsorb sticky or oil dust particles. For production conditions at high temperature from 200' to 480', then the filter bag made by aramid, stainless steel and glass fiber can meet the demand.
Dust collection in cement industry is the most critical factor and needs to meet industry standards. When choosing filter bag in cement industry, the first thing to consider is the ability to absorb large amount of dust, followed by high temperature resistance and corrosion resistance.
Stainless steel filter bag demonstrates resilience against temperatures reaching 480' while also resisting corrosion. On the other hand, polyester filter bag boasts antistatic property, making it well-suited for the collection of dust in environments such as raw mills, clinker coolers, and other areas with medium temperatures and chemical exposure.
PTFE filter bag has excellent chemical resistance and is suitable for cement industry applications with sticky or abrasive dust. Aramid filter bag has excellent wear resistance and flame retardant, 204' high temperature resistance, is an effective low emission solution for cement industry.
As of , over 60% of the globe's electricity is produced by the combustion of fossil fuels, including natural gas, coal, and oil. The exhaust gas released from fuel combustion in boilers contains an array of pollutants, including but not limited to CO', SO', NO, PM, Hg, VOC, etc.
The release of gas emitted from power plants into the environment will cause high degree of environmental pollution. In order to control and reduce the pollutants in power plant emissions, it is very necessary to collect and filter the utilization treatment.
The choice of filter bag material is also very important. Considering the production environment of power plant and high particulate content of pollutants, we need filter bags with large air flow' abrasion performance, and excellent high temperature resistance. Polyester, PPS, PTFE, and glass fiber can meet these needs.
For filter bag used in chemical industry, the first thing to consider is chemical resistance. It needs to be able to withstand continuous exposure to strong acid&alkali, high temperature, humidity or other harsh environments.
In addition, fine chemical industry will emit gases with high dust content, which requires the use of having huge dirt holding capacity and easily cleaned filter bags to capture more impurities, reduces the replacement frequency and downtime, and extend the service life.
The filter bag materials suitable for use in chemical field including PTFE, aramid, polyester, polypropylene, etc., which can provide high filtration efficiency of more than 99% under challenging operating conditions, and are inert to various corrosive chemicals.
The demanding conditions of asphalt mixing and production subject the filter bag to prolonged exposure in an environment characterized by corrosive dust and extreme temperatures.
Consequently, the filter bag must possess qualities such as high temperature resistance, wear resistance, flame retardancy, and efficient filtration capabilities to withstand these challenging operational conditions.
In asphalt mixing industry, materials including PTFE, glass fiber, polyester, PPS, with flame-retardant, high-temperature-resistant, and highly efficient dust removal materials are extensively employed.
Filter bag is commonly crafted with a blend of these materials or coated with additional substances to enhance and optimize their properties for the demanding conditions of asphalt production.
Many products in food and beverage industry need to be filtered, such as milk, fruit juice, beer, cooking oil, syrup, etc. By using filter bags, the particles, gel and other impurities in liquid are captured and purified to effectively improve the cleanliness of food.
In order to avoid the impact of filter bag on product quality, we need to choose filter bag that meet the national food standards. At the same time, filter bag has to be subjected to various sterilization treatments in production room to meet the hygiene standards and sterility.
The filter bag materials that meet food safety standards are polypropylene (PP), PE and nylon, which are non-toxic and produced in dust-free workshop and through ultraviolet sterilization, γ-ray sterilization and other sterilization methods, to ensure the safety of food.
Given its commitment to stringent standards, pharmaceutical industry places paramount importance on safety and efficacy. In pursuit of maintaining drug purity and preventing contamination, the utilization of filter bag becomes imperative for the filtration and separation processes integral to drug production.
In pharmaceutical industry, product cleanliness, safety, and purity are crucial, and the selection of filter bags needs to meet these stringent requirements.
In addition, the selected materials must meet regulatory standards, including those established by organizations such as the FDA and EMA. The filter bag materials that meet these criteria include PP, PTFE, nylon, polyester, glass fiber, cotton, etc.
The difference between various materials of filter bag mainly lies in temperature resistance, chemical resistance and moisture resistance. This part mainly uses these three aspects to analyze which filter bags can be used in different environmental conditions.
In addition, the purchase budget is also a factor to consider when choosing filter bag. Because some filter bags are affordable and some are expensive, so we need to consider comprehensively according to their own needs, and finally choose the most appropriate filter bag.
The temperature of dust-containing gas that needs to be filtered is the primary consideration for screening filter bag material. Dust-containing gases below 130' belong to normal temperature gases, while dust-containing gases above 130' are high temperature gases.
When at room temperature, you can use conventional filter bag materials, such as polyester fiber, polypropylene, cotton, etc. The filter bags of these materials are not suitable for use in high temperature environment, otherwise it will affect the filtration efficiency.
If the temperature is higher than 130', it is necessary to choose high temperature resistant filter bag materials, such as nylon, stainless steel, PTFE, PPS, glass fiber, aramid, etc., to efficiently filter the dust gas in high temperature environment, avoid the emission of pollution gas, and maintain continuous industrial production.
Dust-containing gases can be divided into three categories according to the relative humidity: dry gas (humidity <30%), normal gas (humidity 30%~80%) and high humidity gas (humidity> 80%). Materials of filter bag have different moisture resistance, so they can be used in different fields.
Polyester exhibits effective resistance to moisture, making it suitable for environments with low to moderate humidity levels. Polypropylene and PTFE not only possess resistance to moisture but also demonstrate resilience against various chemicals, making it well-suited for industrial settings characterized by high humidity.
If it is high temperature and high humidity environment, then to avoid the use of high temperature resistant filter materials. Aramid and glass fiber are suitable for high temperature and humidity applications, such as cement, asphalt, metal smelting and other industries.
Selection of suitable filter bag materials based on chemical resistance is essential to ensure the service life and effectiveness of filtration systems in industrial applications.
The compatibility of filter bag material with various chemical components such as acids, alkali, oxidants and organic solvents should be considered.
Cotton filter bag should avoid contact with corrosive chemicals, PP and polyester filter bags can filter general chemicals, but not for highly corrosive chemicals.
PTFE and aramid have excellent corrosion resistance, but also high temperature resistance, and are often used in demanding extreme environments. They are not affected by temperature and acid-base corrosion, and can always maintain high filtration efficiency greater than 99%.
The cost of filter bag is also a factor to consider when choosing material. PTFE and aramid are high-cost materials, they all have excellent chemical resistance and high temperature resistance, often used in harsh environments and have long service life.
If you want to buy more cost effective filter bags, then stainless steel, polypropylene and polyester are excellent choices. They are relatively common and cost-effective materials, with good corrosion resistance and moisture-proof performance, suitable for applications with moderate chemical resistance requirements.
Glass fiber and nylon are the most economical and efficient filter bag materials, they have smooth surface and fibrous structure, with outstanding moisture resistance, in a humid environment to avoid dust blockage, adhesion, provide excellent filtration performance.
This article provides detailed exploration of how to choose the material for filter bags from several aspects, including advantages and disadvantages of different materials, common applications, temperature resistance, chemical resistance, moisture resistance, and product budget considerations.
Whether it is the adaptability of polyester and polypropylene, the elasticity of aramid and PTFE, or the cost-effectiveness of materials like glass fiber, nylon, the choice ultimately depends on unique needs of your application.
In summary, according to this guide, you can address the complexity of filter bag material selection. Your choice will be important in efficiency, life, and cost effectiveness of filtering system, ultimately contributing to the success of your specific industrial or environmental applications.
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