Filter Bag

What is a Filter Bag?

A filter bag is the core component of baghouse dust collection systems, playing a direct role in retaining solid dust particles, thereby ensuring the output air is clean and meets environmental standards. Although its structure is simple, the quality of the filter bag depends on the manufacturing process and fabrication techniques, which determine the efficiency and lifespan of the entire system.

Filter Bag Manufacturing Process

The modern filter bag manufacturing process is carried out on advanced automated equipment lines, strictly adhering to standards. Automation in production yields outstanding advantages:

• High Precision: Ensures the dimensions, straightness, and technical requirements of the filter bag meet absolute standards, eliminating errors caused by manual operations.
• Uniform Quality: Every bag produced has consistent quality, from the cut edges and stitching to the mouth of the bag, ensuring stable performance for the entire system.
• Quality Monitoring: The entire production process is continuously monitored, from the selection of the input filter media to the finished product, helping to ensure the final product meets the highest standards for emitted gas concentration and complies with environmental regulations.

Technical Specifications and Standard Dimensions of Filter Bags

In addition to the material, technical specifications and dimensions are key factors for selecting the appropriate filter bag for each system. Below are the basic technical parameters and dimensions.

1. Common Technical Specifications:

• Weight (Thickness): Approximately 400g/m2to 600g/m2
• This is an important factor that determines the load capacity and durability of the filter bag.
• Air Permeability: 100 to 200L/dm2/s. This parameter represents the volume of air passing through a unit area of the filter media per second, affecting the system’s air exchange capability.
• Filtration Efficiency: Reaches over 99% for dust particles smaller than 10 microns.
• Temperature Resistance
• Temperature Resistance:
  • Continuous Operating Temperature: 130 ∘ C−210 ∘ C (depending on the material). 
  • Maximum Temperature (Instantaneous/Peak): 150 ∘ C−250 ∘ C.
• Tensile Strength (Tenacity): Reaches >1000 N (longitudinal and transverse strength), ensuring the bag will not tear under the effect of pressure and air pulses.

2. Standard Dimensions

• Diameter: The most common are 150 mm and 160 mm. Other diameters, ranging from 120 mm to 200 mm, are also available depending on the filter housing design.
• Length: Typically ranges from 1500 mm to 6000 mm (1.5 m to 6 m).

Outstanding Advantages of Filter Bags

Filter bags are a favored solution due to the following superior advantages:

• High Filtration Efficiency: Capable of retaining even very small dust particles, meeting stringent emission standards.
• Reasonable Investment and Operating Costs: Compared to other complex filtration systems, baghouse filter systems have lower initial costs and relatively competitive maintenance expenses.
• Flexibility: Easy to replace and maintain. Materials and fabrication specifications can be customized to suit the specific needs and conditions of each system.
• High Durability: Thanks to specialized materials and advanced fabrication techniques, filter bags have a long lifespan, which reduces the frequency of replacement.

Diverse Applications in Industrial Sectors

Given their superior characteristics, filter bags are widely applied across almost all industrial production sectors:

• Heavy Industry: Cement plants, steel mills, metallurgical smelters, thermal power plants.
• Chemical Industry: Production of fertilizers, basic chemicals, rubber, plastics.
• Processing Industry: Manufacturing plants for animal feed, flour, gypsum, hot mix asphalt.
• Other Industries: Dust treatment in waste incineration plants, wood production, textiles, and many other industries that generate fine dust.

Focus Engineering’s Stitching and Fabrication Technique – The Decisive Quality Factor

In addition to the filter media material, the stitching and fabrication technique is an extremely important factor that determines the lifespan and performance of the filter bag. Below are the key differences in the stitching and fabrication technique at Focus. This is also a decisive quality factor that helps customers select reputable and professional suppliers and fabricators of filter bags.

• Filter Bag Mouth: The filter bag mouth is stitched separately and connected to the bag body.
• Three-Seam Body Stitching: Needle stitches are equally spaced, with a standard of 3–3.5 mm per stitch, ensuring connection integrity and minimizing weak points on the fabric surface. The distance between the two seams is a standard 5 mm. The thread material matches the fabric material (e.g., Polyester fabric → Polyester thread; PTFE fabric → PTFE thread).
• Heat-Sealed Body (Used for Polyester and PPS Bags): This technology uses heat to seal the filter bag body without the aid of any adhesive. This prevents dust under 10 microns from passing through the needle holes formed by stitching. The heat-sealed section can withstand a tensile force equivalent to that of the filter media. This helps the bag body remain perfectly straight, without twisting or warping. The bag bottom is perfectly round, with the bottom diameter matching the diameter of the filter bag body.
• The combination of high-quality materials, modern production processes, and meticulous fabrication techniques creates filter bags that meet all standards, making them an effective solution for every industrial exhaust gas treatment system.

📞 Need a consultation on Filter Bag for your factory?

We supply Filter Bag for a wide range of equipment and industries. We provide complete technical documentation, product selection consulting, an official warranty, and comprehensive technical support for our customers.

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A reputable and professional manufacturer and supplier of Filter Bag

Focus Engineering Co., Ltd. specializes in providing advanced and modern Filter Bag to meet all customer needs. With over 20 years of experience in the industry, we deliver comprehensive solutions that help businesses meet their production requirements.

With the core value ALL FOR A SUSTAINABLE ENVIRONMENT, we focus on the fields of Consulting – Designing – Fabricating – Installing and transferring technology for DUST FILTRATION SYSTEMS, INDUSTRIAL VALVES, BUCKET ELEVATORS, INDUSTRIAL FANS, SCREW CONVEYORS, CHAIN CONVEYORS, BELT CONVEYORS, TELESCOPIC SPOUTS, WEIGHING CONVEYOR and complete solutions for automatic weighing, bagging, and palletizing systems for industries such as cement, animal feed – aquaculture, chemical fertilizers, rice milling, etc.

In addition to manufacturing and fabrication, Focus also supplies technical and environmental equipment such as INDUSTRIAL BUCKET – BELT CONVEYORS, RUBBER CONVEYOR BELTS, INDUSTRIAL CONVEYOR CHAINS, AIR CANNONS, ROLLERS, CONVEYOR BELT CLEANERS, IMPACT BARS, DUST FILTRATION PRODUCTS, WET FILTRATION PRODUCTS, and OTHER PRODUCTS.

Furthermore, Focus Engineering Co., Ltd. – Focus Laser is a leading company in the field of sheet metal fabrication in Vietnam, with a modern equipment system and a team of experienced technicians. We specialize in providing laser cutting, bending, CNC punching, and manufacturing high-quality mechanical products. We are committed to delivering optimal mechanical solutions, meeting all technical requirements with superior quality.

With a quality management system certified to ISO 9001-2015 and a professional team of engineers and technicians, combined with technology transfer training cooperation from leading prestigious partners such as Martin Engineering – USA, Imeco – Italy, Stif – France, Challenge – UK, DongYang – South Korea, we are always committed to creating product lines and comprehensive solutions that best and most suitably meet all the requirements of our customers and partners.

Please visit our website for the most detailed information or contact:

FOCUS ENGINEERING Co., Ltd

Email: sales@focus-eng.vn