Filter bag
-
Application Fields of PPS Dust Filter Bags
Application Fields of PPS Dust Filter BagsDue to the excellent performance characteristics of PPS dust filter bags, they are widely used in many industries, playing a crucial role.Power Industry
- Coal-Fired Power Plants: The flue gas generated during coal combustion usually has a temperature range of 140 – 180°C and contains a large amount of acidic gases such as SO₂ and NOx, as well as dust. PPS dust filter bags can operate stably in such high-temperature and highly corrosive environments, effectively filtering dust and resisting the erosion of acidic gases. According to statistics, after a large coal-fired power plant adopted PPS filter bags, the dust emission concentration decreased from 50mg/m³ to below 10mg/m³, significantly improving environmental benefits, ensuring that the flue gas meets the emission standards, and meeting the increasingly stringent environmental protection requirements.
- Waste Incineration Power Generation: The flue gas generated by waste incineration has a complex composition, containing not only highly corrosive gases such as HCl and SO₂ but also pollutants like dioxins and heavy metals, with a large temperature fluctuation range (120 – 200°C). PPS filter bags, with their high-temperature resistance and chemical corrosion resistance, can efficiently intercept dust and pollutants while withstanding frequent temperature changes, ensuring the stable operation and environmental compliance of the waste incineration power generation system, and providing strong support for the sustainable development of the waste incineration power generation industry.
Steel Industry
In the steel production process, such as in blast furnace ironmaking, converter steelmaking, and other processes, a large amount of high-temperature dust and waste gas are generated. These waste gases contain a large number of dust particles and harmful gases such as CO and SO₂. PPS dust filter bags can efficiently remove dust particles in an environment with high temperature, high dust concentration, and corrosive gases, reduce the flue dust emission concentration, and minimize air pollution. At the same time, they protect production equipment, extend its service life, and improve production efficiency.Chemical Smelting Industry
In chemical production processes such as smelting, petrochemicals, and coking, the flue gas often contains high concentrations of acidic gases (such as sulfuric acid mist, hydrochloric acid gas), organic pollutants, and high-temperature dust. For example, in metallurgical processes such as copper and zinc smelting, PPS dust filter bags can effectively filter dust containing heavy metals and resist the corrosion of sulfides in the flue gas. In chemical production, many reaction processes generate corrosive waste gases. The chemical corrosion resistance of PPS filter bags enables them to adapt to these harsh working conditions, operate stably, and achieve efficient dust removal, providing reliable guarantee for environmentally friendly production in the chemical smelting industry.Building Materials and Cement Industry
The flue gas emitted from the kiln head and kiln tail of cement plants has a high temperature (150 – 200°C) and contains alkaline dust and a small amount of acidic gases. PPS filter bags can adapt to high-temperature environments and resist the abrasion of alkaline dust and the corrosion of acidic gases. In the cement production process, stable ventilation and efficient dust removal are crucial for ensuring product quality and production efficiency. PPS dust filter bags can efficiently filter dust, maintain stable ventilation during cement production, improve production efficiency, and meet environmental protection requirements, helping the building materials and cement industry achieve green production.Other Industries
In addition to the above main industries, PPS dust filter bags are also widely used in industries such as glass manufacturing, ceramic production, and biomass power generation. In the glass manufacturing process, the flue gas generated by high-temperature furnaces contains dust and some volatile substances, and PPS filter bags can effectively purify the flue gas. In the ceramic industry, a large amount of flue gas and dust generated during the firing process can also be treated by PPS dust filter bags. In biomass power generation, the flue gas contains many fine particles and some corrosive components. PPS filter bags can effectively remove particles and resist a certain degree of corrosion, ensuring the environmental protection of the biomass power generation process. -
Manufacturing Process of PPS Dust Filter Bags
Fiber Selection and Pretreatment
The production of PPS dust filter bags begins with the selection of high-quality PPS fibers. These fibers usually need to be pretreated before use to remove impurities and adjust the surface properties of the fibers, ensuring better bonding during subsequent processing and improving the overall performance of the filter bags. Pretreatment methods include washing, drying, surface modification, etc.Needle FeltingThe pretreated PPS fibers are carded into a web and then needled by a needling machine. During the needling process, barbed needles repeatedly penetrate the fiber web, causing the fibers to entangle with each other, forming a needle felt with a certain thickness and strength. The needling process enables the fibers to interweave in three-dimensional space, increasing the dirt-holding capacity of the filter bags and improving the filtration accuracy. By controlling the needling density and depth, the structure and performance of the needle felt can be adjusted to meet the requirements of different working conditions.Surface TreatmentTo further enhance the performance of PPS dust filter bags, the needle felt is usually subjected to surface treatment. Common surface treatment methods include singeing, calendering, and film coating. Singeing treatment can remove the fluff on the surface of the filter bags, reducing dust adhesion and making dust removal easier. Calendering treatment rolls the surface of the filter bags under high temperature and pressure, making the surface smoother and improving dust release. Film coating involves covering the surface of the filter bags with a Polytetrafluoroethylene (PTFE) film. This film has a microporous structure, which can further improve the filtration accuracy, achieving efficient filtration of ultra-fine dust particles. Meanwhile, it can also enhance the water and oil resistance of the filter bags. -
PPS Material Dust Filter Bags: Reliable Guardians of Industrial Environmental Protection
Dust pollution is a non-negligible issue in industrial production. It not only severely damages the environment but also endangers the health of workers and affects the normal operation of production equipment. To effectively address dust pollution, dust removal and filtration equipment have emerged. As the core component of such equipment, the performance of dust filter bags directly determines the effectiveness of dust removal. Among various materials for dust filter bags, Polyphenylene Sulfide (PPS) stands out with its excellent properties, becoming a reliable guardian in the field of industrial environmental protection.
Characteristics of PPS MaterialPPS is a high-performance special engineering plastic with a series of outstanding properties, making it highly suitable for manufacturing dust filter bags.High Temperature ResistancePPS material has a relatively high melting point, usually around 285°C, enabling PPS dust filter bags to operate stably in high-temperature environments. Generally, they can be used continuously at 190°C and withstand a maximum instantaneous temperature of 230°C. This excellent high-temperature resistance makes them perform exceptionally well in handling high-temperature flue gas. For instance, in high-temperature industrial scenarios such as coal-fired boilers, cement rotary kilns, and waste incinerators, PPS filter bags can effectively filter dust without deformation, aging, or damage due to high temperatures, ensuring the long-term stable operation of the dust removal system.Chemical Corrosion ResistancePPS exhibits strong resistance to acids, alkalis, salts, and most organic solvents. In industrial production, many flue gases contain various corrosive gases and chemical substances, such as sulfur dioxide (SO₂), nitrogen oxides (NOx) in the flue gas of coal-fired power plants, and sulfuric acid mist, hydrochloric acid gas in the flue gas of the chemical smelting industry. PPS dust filter bags can maintain their structural and performance stability in such complex and corrosive environments, effectively resisting the erosion of chemical substances. This significantly extends the service life of the filter bags and reduces equipment maintenance costs.Good Mechanical PropertiesPPS fibers have high strength and modulus, with mechanical properties similar to those of polyester fibers. This means that during the use of PPS dust filter bags, they can withstand significant pressure and friction, and are not prone to breakage or damage. In the process of pulse cleaning and other operations, filter bags need to withstand the impact and friction of airflow frequently. The high mechanical strength of PPS material ensures that the filter bags can withstand these tests and maintain good filtration performance.Flame RetardancyPPS is inherently a flame-retardant material, with a limiting oxygen index (LOI) ≥ 34, making it difficult to burn. In some industrial environments with fire risks, such as the waste incineration power generation industry, the flame retardancy of PPS dust filter bags is particularly important. They can effectively prevent the spread of fire in case of a fire, reducing the harm to equipment and personnel and ensuring production safety.High Filtration EfficiencyPPS dust filter bags are manufactured using advanced processes. The fiber structure is dense, and a three-dimensional structure formed by processes such as needling endows them with good porosity and air permeability. This structural feature enables the filter bags to effectively capture and intercept tiny dust particles. The filtration efficiency for dust particles larger than 0.1μm can reach over 99%, meeting strict environmental protection emission standards. They can efficiently remove dust particles from flue gas, significantly reducing the flue dust emission concentration and improving environmental quality. -
Filter Bags: The Ultimate Filtration Choice for Quality Assurance
In an era where quality and efficiency are of utmost importance, filter bags stand out as the ultimate choice for achieving optimal filtration results. These remarkable filter bags are designed to meet the diverse needs of different industries and applications, ensuring the highest level of product quality and environmental protection.
Filter bags are widely applied across multiple industries. In food processing, they are responsible for removing impurities from ingredients, ensuring the safety and quality of food products. From the extraction of pure fruit juices to the refining of edible oils, filter bags work tirelessly to deliver a perfect end – product. In the industrial sector, filter bags play a critical role in maintaining the integrity of production processes. They filter out contaminants from industrial fluids, chemicals, and paints, ensuring smooth operations and high – quality output. In environmental management, filter bags contribute to the treatment of wastewater, helping to preserve water resources and protect the ecosystem.The variety of materials used in filter bags offers distinct benefits. Nylon filter bags are highly durable and chemically resistant, making them suitable for heavy – duty industrial filtration tasks. Cotton filter bags, being natural and eco – friendly, are ideal for applications where contact with food is involved. Non – woven filter bags are known for their cost – effectiveness and good filtration capabilities, making them a common choice in many daily – use and commercial applications. Filter bags made from other materials, such as polyester, stainless steel, and polytetrafluoroethylene, offer specialized features for specific filtration challenges.The design and construction of filter bags are carefully crafted for superior performance. The high – density mesh design enables efficient capture of fine particles. Innovative manufacturing processes, including hot – melt bonding and precision sewing, ensure reliable performance and prevent any potential leakage. Special features like removable labels and precisely engineered metal rings further enhance the functionality of filter bags, ensuring a secure fit and minimizing the risk of contamination.Filter bags are also user – friendly in terms of maintenance. Their easy – to – clean nature allows for quick restoration of filtration performance. Their long service life reduces the frequency of replacement, saving both time and cost. With a comprehensive range of sizes and specifications, filter bags can be customized to meet the unique requirements of any filtration task. Whether it’s a small – scale home project or a large – scale industrial operation, filter bags are the reliable solution for achieving efficient and high – quality filtration. Trust filter bags to deliver the best results for all your filtration needs. -
Explore the Superiority of Filter Bags: Your Key to High – Efficiency Filtration
Filter bags are the unsung heroes in the world of filtration, providing efficient and reliable solutions for countless applications. Their significance lies in their ability to deliver high – quality filtration, making them essential in both daily life and industrial operations.
In the food and beverage sector, filter bags are vital for producing top – notch products. When making soy milk, filter bags separate the soybean residue, leaving behind a smooth and nutritious drink. In the production of fruit juices, they remove unwanted pulp, enhancing the clarity and taste. In the industrial field, filter bags are used in a wide array of processes, from the purification of chemicals to the treatment of industrial fluids. They effectively remove particulate matter, ensuring the smooth progress of production and the quality of end – products. In environmental applications, filter bags are crucial for purifying wastewater, playing a key role in environmental protection.The materials of filter bags determine their performance and suitability for different tasks. Nylon filter bags are strong and resistant to chemicals and wear, making them suitable for harsh industrial environments. Cotton filter bags, with their natural and safe properties, are favored in food – processing scenarios. Non – woven filter bags combine affordability with good filtration efficiency, making them popular in many household and commercial applications. Other materials like polyester, stainless steel, and polytetrafluoroethylene offer specialized features for specific filtration requirements.The design of filter bags is optimized for maximum performance. The precisely engineered mesh structure ensures efficient particle removal. Advanced manufacturing methods, like the hot – melt process for non – woven bags and precision sewing techniques, guarantee reliable performance and prevent leakage. Attention to detail, such as the use of removable labels, shows the commitment to maintaining the purity of the filtrate. Filter bags with high – precision metal rings provide a secure fit, reducing the chances of side leakage.Maintenance of filter bags is straightforward, and their long – lasting nature makes them a cost – effective choice. Regular cleaning can restore their filtration ability, and their durability means less frequent replacement. The wide range of sizes and specifications of filter bags allows users to select the most suitable option for their specific needs. Whether you are a home cook, a small business owner, or a large – scale manufacturer, filter bags can meet your filtration requirements. Choose filter bags for a cleaner, purer, and more efficient filtration experience. -
Filter Bags: Unrivaled Filtration Solutions for Diverse Industries
Filter Bags: Unrivaled Filtration Solutions for Diverse IndustriesIn the modern world, where precision and purity are highly valued, filter bags have emerged as indispensable tools across a multitude of industries. These versatile filter bags play a crucial role in ensuring the quality of products and safeguarding the environment by efficiently removing impurities and contaminants.Filter bags find extensive applications in various sectors. In the food industry, filter bags are essential for maintaining the hygiene and taste of food products. Whether it’s the production of beverages like fruit juices and soy milk, or the refining of edible oils, filter bags with their fine – meshed structure can effectively separate residues such as fruit pulp and soybean dregs, guaranteeing a pure and delightful taste. In the industrial realm, filter bags are utilized for the purification of chemical raw materials, filtration of electroplating solutions and paints. High – performance filter bags, such as the BMN series, can provide precise micron – level filtration, meeting the stringent requirements of critical industrial applications. In environmental protection, filter bags contribute significantly to wastewater treatment, helping to separate solid impurities and promoting the recycling of water resources.The diverse range of materials used in filter bags offers unique advantages. Nylon filter bags are renowned for their excellent abrasion resistance and chemical stability. They can withstand high – temperature environments and are ideal for filtering liquids containing particulate impurities, widely used in industrial liquid filtration. Cotton filter bags, made from natural materials, are environmentally friendly and possess superior breathability and moisture absorption, making them perfect for food – related applications. Non – woven filter bags are cost – effective and highly efficient in filtration. They are commonly applied in air filtration, traditional Chinese medicine decoction, and tea – making, effectively filtering out dust and other impurities. Additionally, filter bags made of polyester, stainless steel, and polytetrafluoroethylene also shine in different working conditions, meeting diverse filtration needs.In terms of design and manufacturing, filter bags showcase outstanding craftsmanship. The high – density mesh design enhances filtration efficiency, enabling the capture of even the tiniest particles. Advanced manufacturing techniques, such as hot – melt bonding for non – woven filter bags and high – speed industrial sewing without silicone oil for stitched filter bags, ensure leak – proof performance and prevent contamination of the filtrate. Special attention is also paid to details like removable product labels to avoid any potential pollution. Some filter bags are equipped with stainless – steel collars or galvanized steel rings, which, through argon – arc welding technology, achieve high – precision dimensions, improving the sealing degree and reducing the risk of leakage.Filter bags are not only efficient but also easy to maintain and cost – effective. Most filter bags can be cleaned simply by shaking or rinsing after use. For stubborn stains, appropriate cleaning methods can be adopted according to the material. Their durability means fewer replacements, reducing overall costs. With a wide variety of sizes and specifications available, filter bags can perfectly adapt to different user requirements, from small – scale home use to large – scale industrial production. In conclusion, filter bags are the go – to choice for high – quality filtration, offering reliable solutions for various industries. -
Dewatering Filter Bag for Removing Sediment and Pollutants
A dewatering filter bag is a filtration component specifically designed to separate solid sediments, suspended matter, and pollutants from liquids, widely used in industrial wastewater treatment, municipal sludge dewatering, mining tailings processing, and other scenarios. Its core function is to achieve solid-liquid separation through efficient interception and dewatering, reducing the solid content in liquids or minimizing sludge volume.I. Core Characteristics and Working Principle
1. Key Materials and Structure
- Materials:
- Primarily made of polypropylene (PP) or polyester (PET) fibers, offering acid-alkali resistance and wear resistance;
- Special scenarios (e.g., high temperature, strong corrosion) may use nylon (PA) or polytetrafluoroethylene (PTFE).
- Structural Design:
- Multi-layer composite filter cloth: Coarse outer layer intercepts large particles, while a fine inner layer captures tiny impurities to improve dewatering efficiency;
- High-strength stitching: Reinforced stitching on bag openings and edges prevents tearing during filtration.
2. Working Principle
- Filtration Stage: Sewage containing sediments enters the filter bag, where solid particles are trapped by the filter cloth, and water drains through the cloth pores;
- Dewatering Stage: External forces (e.g., pressure, vacuum, or gravity) squeeze the bag to further extract water from between particles, forming a filter cake with a moisture content of 50–80% (depending on the application).
II. Main Application Scenarios
1. Industrial Wastewater Treatment
- Scenarios: Heavy metal ion precipitates (e.g., copper hydroxide, iron hydroxide), slag particles in wastewater from chemical, metallurgical, and electroplating industries;
- Role: Reduces SS (suspended solids) concentration in wastewater to meet subsequent treatment or discharge standards, while recovering valuable metal particles.
2. Municipal and Environmental Engineering
- Scenarios: Sludge thickening tanks in wastewater treatment plants, river dredging slurry, construction piling wastewater, etc.;
- Role: Rapidly separates water from slurry, reducing sludge volume (volume reduction ratio up to 3:1) and lowering transportation and disposal costs.
3. Mining and Quarrying Industry
- Scenarios: Dewatering of tailings slurry, ore washing wastewater treatment, mine pit drainage purification, etc.;
- Role: 截留 ore particles and heavy metal pollutants, enabling water recycling and reducing environmental risks in tailings ponds.
4. Food and Chemical Industries
- Scenarios: Separation of fruit pulp residues in food processing wastewater, crystallization products in chemical reactions, etc.;
- Role: Recovers solid raw materials (e.g., starch, sugar residue) while purifying wastewater.
III. Key Selection Parameters
1. Filtration Precision and Pore Size
- Precision Range: Typically 5–200 microns, matched to sediment particle size:Pore Size Distribution: Choose surface filtration (uniform pores) or deep filtration (gradient pores). The former suits uniform particle 污水，while the latter fits complex water with multiple particle sizes.
- Coarse particles (e.g., sand): 50–200 microns;
- Fine suspended matter (e.g., colloids): 5–50 microns.
2. Dewatering Performance Indicators
- Water Permeability: Water flux per unit filter cloth area (L/m²·h). Higher permeability speeds up filtration but requires balancing with interception efficiency;
- Water Retention: The ability to retain water in the filter cake. Poor water retention improves dewatering efficiency (e.g., when used with flocculants).
3. Pressure Resistance and Strength
- Operating Pressure: Matches the pressure type of dewatering equipment (e.g., plate-and-frame filter presses can reach 0.6–1.0MPa, while vacuum filtration uses negative pressure);
- Tear Resistance: Select filter cloth with warp and weft tensile strength ≥1500 N/m to avoid damage under high pressure.
4. Chemical Compatibility
- pH Tolerance:Solvent Resistance: Choose PET or PTFE for oily wastewater to prevent PP from swelling and damaging.
- PP material: Suitable for pH 1–14 (resistant to strong acids and alkalis);
- PET material: Suitable for pH 4–10 (resistant to weak acids and alkalis, not concentrated acids).
IV. Supporting Equipment and Processes
1. Common Dewatering Equipment
- Plate-and-Frame Filter Press: Exerts hydraulic pressure to squeeze filter bags, suitable for high-concentration slurry dewatering with low filter cake moisture content (≤60%);
- Vacuum Filter: Uses negative pressure to suction water, suitable for fine-particle sludge with high processing efficiency but higher energy consumption;
- Centrifugal Filter: Separates solid-liquid via centrifugal force, suitable for uniform particle sediments with small footprint.
2. Pretreatment Processes
- Flocculant Addition: Adds polyaluminum chloride (PAC) or polyacrylamide (PAM) to sewage to agglomerate fine particles into large flocs, improving filter bag interception efficiency and dewatering speed;
- Pre-Filtration: Uses coarse filter bags (e.g., 200 microns) to remove large particles, protecting fine filter bags and extending service life.
V. Maintenance and Environmental Considerations
1. Maintenance Tips
- Cleaning Frequency:Damage Inspection: Regularly check stitching and the bottom of the bag, and replace promptly if damage is found to prevent material leakage.
- Reusable filter bags: Backwash with high-pressure water after each dewatering to remove residual particles in filter cloth pores;
- Disposable filter bags: Replace immediately when saturated to avoid clogging and reduced filtration efficiency.
2. Environmental Treatment
- Filter Cake Disposal: Filter cakes with high heavy metal content must be treated as hazardous waste (e.g., stabilized landfilling); general industrial filter cakes can be used for brick-making, landfilling, or incineration;
- Filter Bag Recycling: Choose recyclable materials (e.g., PP, PET) and send them to professional recycling companies to reduce white pollution.
VI. Comparison with Other Filtration Methods
Filtration Method Applicable Solid Content Post-Dewatering Moisture Content Cost (¥/ton of wastewater) Advantages Dewatering Filter Bag 5–50 g/L 50–80% 5–15 Low cost, simple operation Membrane Separation ≤5 g/L 90–95% 20–50 High precision, high automation Centrifugal Separation 10–100 g/L 60–85% 10–20 High efficiency, small footprint Selection Advice: Prioritize dewatering filter bags for medium-to-high solid content wastewater (>10 g/L), especially in cost-sensitive or mobile operation scenarios (e.g., emergency drainage, temporary construction wastewater treatment). For further optimization, provide parameters such as sewage composition and treatment volume to customize filter bag specifications and processes. - Materials:
-
bag filters for water treatment
Bag filters are commonly used filtration devices in the water treatment field. They intercept suspended solids, colloids, particulate impurities, etc., in water through built-in filter bags, featuring simple structure, high filtration efficiency, and convenient maintenance. Below is key information and application highlights:I. Core Components and Working Principle
1. Main Structure
- Filter Housing: Mostly made of stainless steel (e.g., 304/316L) or engineering plastics, pressure-resistant and corrosion-resistant, with inlet, outlet, and filter bag chamber.
- Filter Bag: Constructed from synthetic fibers like polypropylene (PP) or polyester (PET), with precision ranging from 1–500 microns, fixed inside the filter via a top ring.
- Support Basket: Secures the filter bag to prevent deformation during filtration and guides uniform water flow through the filter media.
2. Working Principle
- Water to be treated flows into the filter through the inlet. As it passes through the filter bag, impurities are trapped inside the bag, while clean water exits through the outlet via filter bag pores.
- When the filter bag is saturated with contaminants (judged by inlet-outlet pressure difference, e.g., >0.1MPa), the bag needs replacement without disassembling the entire system.
II. Main Types and Characteristics
1. Classification by Housing Type
Type Characteristics Application Scenarios Single-bag filter Contains only 1 filter bag, compact structure, small flow rate (5–50 m³/h), low cost. Small systems, laboratories, household water purification Multi-bag filter Can install 2–24 filter bags in parallel, large flow rate (up to 500 m³/h), requires manifold design. Industrial water treatment, municipal water supply (large systems) Top-inlet/side-inlet Different inlet positions; top-inlet ensures more uniform water flow, while side-inlet suits space-constrained scenarios. Selected based on installation space 2. Classification by Pressure Rating
- Low-pressure type: ≤0.3MPa, suitable for normal or low-pressure scenarios (e.g., municipal tap water filtration).
- Medium-high pressure type: 0.6–1.6MPa, ideal for high-pressure systems like industrial circulating water or RO pretreatment.
III. Advantages and Limitations
Advantages
- Flexible filtration precision: Can meet various needs from coarse to fine filtration by replacing filter bags of different precisions (1–500 microns).
- High dirt-holding capacity: Deep filter bag structure retains more impurities, extending replacement cycles (30–50% higher dirt capacity than cartridge filters).
- Low maintenance cost: Filter bags can be replaced without professional tools, with low individual bag cost (¥10–200), minimizing downtime.
- High compatibility: Suitable for various water qualities (acidic/alkaline liquids, oily wastewater, high-temperature water) via material selection for bags and housings.
Limitations
- Higher pressure loss: Deep filtration structure causes greater water flow resistance than precise filtration methods like membrane filtration.
- Low automation level: Requires manual monitoring of pressure difference or regular bag replacement, unsuitable for unmanned scenarios (can be improved with automatic pressure alarms).
IV. Typical Application Scenarios
1. Industrial Water Treatment
- Circulating cooling water filtration: 截留 algae, sediment, rust, etc., to prevent heat exchanger blockage and extend equipment life.
- Chemical wastewater pretreatment: Removes suspended solids and colloids for subsequent biochemical or membrane treatment.
- Metalworking fluid filtration: Filters metal chips and sludge from cutting fluids for recycling.
2. Municipal and Civil Applications
- Waterworks pretreatment: Further removes fine particles after sedimentation to improve water clarity.
- Sewage plant deep filtration: Serves as a post-secondary clarifier unit to reduce effluent SS (suspended solids) concentration for compliance.
- Commercial/household water purification: Used in pool filtration, direct drinking water pretreatment (with activated carbon filter bags), etc.
3. Special Industry Applications
- Food and beverage industry: Filters impurities from syrups and alcoholic beverages to meet hygiene standards (requires FDA-certified food-grade filter bags).
- Pharmaceutical and electronics industry: Prepares high-purity water by intercepting particulate contaminants for reverse osmosis (RO) or EDI systems.
V. Selection and Maintenance Tips
1. Key Selection Parameters
- Flow rate and number of filter bags: Choose single or multi-bag filters based on system flow. A single No. 2 filter bag (810mm length) handles ~30 m³/h at 50-micron precision.
- Material compatibility:Precision selection: Based on impurity particle size (e.g., ≤5 microns for RO pretreatment, 50–100 microns for coarse filtration).
- Acidic liquids: PP filter bag + stainless steel housing;
- Oily wastewater: PET filter bag + anti-corrosion coated housing;
- High-temperature liquids (>80℃): high-temperature-resistant PET filter bag.
2. Maintenance Recommendations
- Replacement cycle:
- Normal water quality: Replace every 1–3 months (pressure difference-dependent);
- High-turbidity water: Inspect weekly and replace immediately when pressure difference reaches 0.1MPa.
- Operation notes:Environmental treatment: Prioritize degradable filter bags or centralized recycling for disposable bags to reduce pollution.
- Relieve pressure before replacing bags to avoid high-pressure water impact;
- Ensure the bag’s sealing ring tightly fits the filter to prevent bypass flow.
-
How to select water filter bags suitable for specific water treatment needs?
Choosing the right water filter bags for specific water treatment requirements requires comprehensive consideration of water quality characteristics, treatment objectives, system parameters, and application scenarios. Below is a detailed selection process and key considerations:I. Clarify water quality and treatment objectives
1. Analyze water source impurity characteristics
- Particle types: Suspended solids (e.g., sediment, rust), colloids (e.g., clay, microorganisms), oils, or specific pollutants (e.g., metal ions, organic matter).
- Particle size: Determine the main impurity particle size range through water quality testing (e.g., coarse particles >50 microns, fine particles <10 microns).
- Chemical properties: Liquid acidity/alkalinity (pH value), corrosiveness (e.g., chloride ions, strong oxidizers), and temperature (normal or high-temperature environments).
2. Define filtration goals
- Precision requirements: Target filtration accuracy (e.g., drinking water ≤5 microns, industrial circulating water up to 50 microns).
- Treatment volume: Water flow rate per unit time (e.g., 10 m³/h, 100 m³/h), affecting filter bag size and quantity.
- Impurity interception capacity: Concentration of contaminants to be intercepted (high-turbidity water sources require high dirt-holding capacity filter bags).
II. Core selection parameters
1. Filtration precision (critical parameter)
- Precision range: Common filter bag precisions range from 1–500 microns, selected based on impurity particle size.Note: Excessively high precision may cause rapid clogging; balance filtration efficiency with flow rate.
- Examples:
- Swimming pool water filtration: 20–50 microns (removes hair, sediment).
- Pre-treatment for electronic-grade ultrapure water: 1–5 microns (intercepts tiny particles).
- Chemical wastewater oil removal: 10–25 microns (paired with demulsification processes).
- Examples:
2. Material compatibility
- Common materials and applications:
Material Corrosion resistance Temperature resistance Typical applications Polypropylene (PP) Resistant to acids, alkalis, salt solutions ≤80℃ Industrial wastewater, municipal sewage, food processing Polyester (PET) Resistant to oil and general solvents ≤120℃ Lubricating oil filtration, oily wastewater treatment Nylon (PA) Resistant to strong alkalis, wear-resistant ≤90℃ High-turbidity water sources, metalworking fluid filtration - Selection principles:
- Choose PP material for acidic liquids and PA or PET for alkaline liquids.
- Select PET or special high-temperature-resistant fibers for high-temperature environments (e.g., boiler water).
3. Filter bag size and structure
- Specification categories:
- No. 1 bag: Diameter 110mm, length 380mm, flow rate ~5–15 m³/h (common in small systems).
- No. 2 bag: Diameter 180mm, length 810mm, flow rate ~20–50 m³/h (mainstream for medium-to-large systems).
- Others: No. 3 bags, No. 4 bags, or non-standard custom sizes.
- Structural design:
- Monofilament filter cloth: Smooth surface, easy to clean, suitable for intercepting large particles (coarse filtration).
- Multifilament/needle-punched filter cloth: Deep filtration, high dirt-holding capacity, suitable for fine particle filtration.
- Reinforced ring design: Stainless steel or plastic rings at the top to prevent bag mouth tearing and improve pressure resistance.
4. Pressure resistance and flow matching
- System pressure: Filter bags must withstand ≥ system operating pressure (typically 0.1–0.6MPa); use thickened materials or metal frame supports for high-pressure scenarios.
- Flow calculation:
- A single No. 2 bag at 50-micron precision has a flow rate of ~30 m³/h; for a 100 m³/h system, parallel 4 bags (with redundancy).
III. Other key factors
1. Dirt-holding capacity and replacement cycle
- Dirt-holding capacity: Total amount of impurities a filter bag can retain (unit: g/bag); high capacity reduces replacement frequency.
- Estimation method:
- For known suspended solids concentration (e.g., 500 mg/L) and total treatment volume (e.g., 1000 m³), total impurity weight = 500 mg/L × 1000 m³ = 500 kg.
- If a single filter bag holds 5 kg, it needs to be replaced 100 times per cycle, or increase the number of filter bags to reduce frequency.
2. Environmental protection and cost
- Disposable vs. washable:Material recyclability: Prioritize recyclable PP/PET materials to reduce plastic pollution.
- Disposable filter bags: Low cost (~¥10–50/bag), suitable for complex impurities or non-washable scenarios.
- Washable filter bags: Higher cost (~¥200–500/bag) but reusable, ideal for high-value liquids or strict environmental requirements.
3. Compatibility with supporting equipment
- Filter type: Must match filter bag size (e.g., No. 1 bag for small filters, No. 2 bag for standard filters).
- Sealing method: O-ring or flange sealing to ensure no leakage.
IV. Selection process example
Scenario: A food factory needs to filter production water containing sediment (particle size 20–100 microns), with a flow rate of 50 m³/h and normal-temperature neutral water.- Precision selection: Intercept particles >20 microns, choose 25-micron precision filter bags.
- Material selection: Neutral water, choose economical and durable PP material.
- Size selection: Single No. 2 bag flow rate 30 m³/h, require 2 bags in parallel (total flow 60 m³/h to cover 50 m³/h demand).
- Structure selection: Needle-punched filter cloth (deep filtration, high dirt-holding capacity) with stainless steel reinforcing rings.
- Replacement cycle: Estimated daily treatment volume 400 m³, inlet suspended solids concentration 200 mg/L, daily impurity total 80 kg; single bag dirt-holding capacity 5 kg, requires daily replacement of 2 bags (or replace every 2 days with spare bags).
V. Notes
- Testing and verification: For high-requirement scenarios (e.g., pharmaceuticals, electronics), test with sample filter bags first to confirm filtration efficiency and service life.
- Supplier qualification: Choose ISO-certified manufacturers to ensure filter bags meet hygiene standards (e.g., food-grade requires FDA certification).
- Emergency plans: Stock spare filter bags to avoid system downtime; regularly inspect for damage (replace immediately if pressure drop surges).
-
Water filter bag,Do water filter bags work?
A water filter bag is a filtration component used in the water treatment field, primarily designed to intercept suspended solids, colloids, particulate impurities, etc., in water to purify the water quality or meet specific process requirements. Its materials are typically corrosion-resistant and wear-resistant synthetic fibers such as polypropylene (PP) and polyester (PET), which are made into filter fabrics of different precisions through needle punching, weaving, or other processes, and then sewn into a bag-like structure.Main Features
- Diverse Filtration Precisions
- The precision range typically spans 1–500 microns. Filter bags with different pore sizes (e.g., 10 microns, 50 microns) can be selected according to water quality requirements to meet various needs such as coarse filtration and fine filtration.
- High Interception Efficiency
- The deep filtration structure effectively captures impurities of different particle sizes, with a large dirt-holding capacity and long service life.
- Chemical Corrosion Resistance
- The materials are resistant to acids, alkalis, and most chemical reagents, suitable for multiple scenarios such as industrial wastewater, municipal sewage, and food processing water.
- Convenient Replacement
- The bag-type structure is easy to install and replace without professional tools, reducing maintenance costs.
Application Scenarios
- Industrial Water Treatment: For example, filtration of circulating cooling water, pretreatment of chemical wastewater, and filtration of metalworking fluids to remove suspended solids and mechanical impurities.
- Municipal Water Supply/Sewage Treatment: Used for pretreatment in waterworks and secondary filtration in sewage plants to improve water clarity.
- Food and Beverage Industry: Filters production water, syrups, alcoholic beverages, etc., to ensure products meet hygiene standards.
- Pharmaceutical and Electronics Industry: Used for pretreatment of high-purity process water to intercept particulate contaminants and meet clean production requirements.
Selection Considerations
- Filtration Precision: Choose appropriate precision based on the particle size of impurities in the water source and treatment objectives (e.g., 50 microns for swimming pool water filtration, 1 micron for electronic-grade water).
- Material Compatibility: Ensure that the filter bag material is chemically compatible with the liquid to be treated (e.g., polypropylene for acidic liquids).
- Flow Rate and Pressure: Select filter bag sizes (e.g., No. 1 bag, No. 2 bag, etc.) according to the system flow rate, and ensure pressure resistance meets working conditions.
- Support Structure: Needs to be used with a bag filter; pay attention to the matching of the filter’s diameter, sealing method, and filter bag.
- Environmental Requirements: Prioritize recyclable materials or filter bags that meet environmental standards to reduce secondary pollution.
- Diverse Filtration Precisions
-
PE500/PTFE Filter Cloth Product Introduction
PE500/PTFE Filter Cloth Product Introduction
1. Product Overview The PE500/PTFE filter cloth combines the excellent properties of polyethylene (PE500) and polytetrafluoroethylene (PTFE), presenting itself as a high – performance filter material. It is engineered to meet the diverse filtration needs across multiple industries, providing efficient solid – liquid separation and ensuring long – term stable operation.
2. Material Characteristics -
**PE500**: This material endows the filter cloth with high tensile strength and good toughness, enabling it to withstand significant mechanical stress during the filtration process without easily deforming or breaking. It also exhibits good chemical resistance to a wide range of common chemicals, protecting the filter cloth from corrosion and extending its service life. –
PTFE: Known as “King of Plastics”, PTFE has outstanding chemical inertness, being resistant to almost all chemicals, including strong acids, alkalis, and organic solvents. Additionally, it has extremely low surface energy, resulting in excellent anti – sticking properties. Particles and residues are less likely to adhere to the surface of the PTFE – based filter cloth, facilitating easy cake release and reducing the frequency of cleaning.
3. Key Features – **High Filtration Efficiency**: With precisely controlled pore sizes, the PE500/PTFE filter cloth can effectively capture fine particles, achieving high – precision filtration. Whether filtering suspended solids in liquid or separating dust in gas, it can ensure the filtrate or discharged gas meets strict quality standards.
Long Service Life: Thanks to the excellent chemical and mechanical properties of its materials, the filter cloth has remarkable durability. It can maintain stable filtration performance over extended periods of continuous operation, reducing the frequency of replacement and thereby lowering overall operating costs.
**Good Chemical Stability**:
Resistant to various harsh chemical environments, it can be safely used in industries such as chemical engineering, pharmaceuticals, and electroplating, where highly corrosive substances are often present. – **Easy to Clean**: The anti – sticking property of PTFE makes cleaning a breeze. Both mechanical cleaning methods, such as backwashing and vibration, and chemical cleaning can effectively remove residues on the filter cloth, restoring its filtration performance quickly. ## 4. Application Scenarios – **Chemical Industry**: Ideal for filtering chemical reaction products, separating catalysts, and purifying chemical solvents. It can handle highly corrosive chemical media while maintaining high – quality filtration. – **Pharmaceutical Industry**: Used in the production process to filter pharmaceutical intermediates and final products, ensuring product purity and compliance with strict pharmaceutical standards. Its non – shedding and high – cleanliness characteristics are crucial in pharmaceutical manufacturing.
**Food and Beverage Industry**:
Suitable for filtering fruit juices, beverages, and edible oils. It meets food – grade safety requirements, ensuring no harmful substances are introduced during the filtration process and maintaining the taste and quality of food products. – **Mining and Metallurgy**: Helps in separating valuable minerals from ores and purifying wastewater generated during the mining and metallurgical processes. Its high – strength structure can withstand the harsh conditions of the mining environment.
5. Technical Parameters – *
*Filtration Precision**: [Specify the precise range, e.g., 0.1 - 100 microns] – **Tensile Strength**: [Provide the data, e.g., longitudinal tensile strength ≥ [X] N/cm, transverse tensile strength ≥ [Y] N/cm] – **Working Temperature**: – [X] °C to [X] °C – **pH Resistance Range**: [Specify the applicable pH range, e.g., 1 - 14]
If you have any further questions or specific requirements regarding our PE500/PTFE filter cloth, please feel free to contact us. Our professional team is ready to offer you detailed solutions and excellent after – sales service.
-
Wide Applications of Filter Bags
In the industrial field, filter bags can be seen everywhere. In the chemical industry, they are used for the filtration of various chemical raw materials and products, ensuring product quality and the smooth progress of the production process. In the food and beverage industry, from the filtration of raw materials to the filtration before filling of finished products, they ensure the safety and taste of food and beverages. In the pharmaceutical industry, which has extremely high requirements for filtration accuracy and hygiene, filter bags are used for the filtration of liquid medicines, removing impurities and microorganisms to ensure the quality and safety of drugs.
In the environmental protection field, filter bags play an important role. In sewage treatment plants, filter bags are used to filter impurities and suspended solids in sewage, laying the foundation for subsequent treatment processes. In industrial waste gas treatment, dust – removal filter bags can effectively reduce dust emissions, reduce pollution to the atmospheric environment, and help achieve environmental protection goals.In daily life, filter bags also quietly serve us. The water purifiers at home may use filter bags to filter impurities in water, allowing us to drink cleaner water. The pour – over coffee filter bags used by coffee lovers can filter out coffee grounds, bringing a pure coffee taste. Even in the kitchen, some filter bags for making soup can filter out the residue in the soup, making the soup more delicious.Although filter bags seem inconspicuous, they play an indispensable role in various fields. With the continuous progress of science and technology and the increasing requirements for filtration, the performance and quality of filter bags are also constantly improving. In the future, they will continue to serve as key guardians in the filtration world, escorting our lives and production.