Polyester Filter Bags

Description

Polyester filter bags are most common materials in the filter bag family. Polyester needle felt filter bags are made of needle punched many times and properly rolled. The short fibers are laid into a fiber web, and then the fiber web is reinforced into a cloth by needles with barbs, and the fiber web is repeatedly punctured to reinforce the fibers to form a needle-punched non-woven fabric. Non-woven fabrics have no distinction between warp and weft, the fibers are messy, and there is little difference in radial and weft properties. The air permeability of the polyester filter bag is more than 50% higher than that of the ordinary calendered filter material, the surface is smooth, the air permeability is good, and the resistance is low.

Specification of Polyester Filter Bags

Heat resistance℃/℉	up to 130/266
Fabric	100% polyester
Length & diameter	No limited
Area weight (g/m2)	350~650
Working lifetime	8000 hours and more
MOQ	50pcs

Physical properties

Air permeability(L/m2.s) @200pa	Tensile strength(N/5cm)		Temperature(℃/℉)
	warp	weft	continue	instant
200~300	1300	1500	130/266	150/302

Chemical properties

Acid Resistance	Alkali Resistance	Hydrolytic Resistance	Oxidation Resistance	Abrasion resistance
Moderate	Moderate	Poor	Good	Excellent

Working Principle

The working principle of the polyester filter bag is the so-called “depth filtration” technology, that is, the “primary dust layer” (powder filter cake) is formed on the surface through the capture of the filter material fibers, and then the subsequent dust is filtered out through the powder filter cake. During the initial use of the polyester filter bag, due to its own large gap, some dust will be discharged through the filter material. Only when the powder cake is formed can the filtration process actually begin. After continuous use, the dust on the surface of the polyester filter bag will gradually penetrate into the filter material, causing the pores of the filter material to be blocked, increasing the running resistance of the equipment until the filter material must be replaced.

In The Non-Woven Category, PET(Polyester) Needle Punched Non-Woven Material Has The Following Characteristics:

• High Filtration Efficiency: Polyester filter bags can efficiently capture fine dust, particles, and contaminants due to their dense fiber structure.
• Durability and Strength: Polyester fibers are strong and resistant to tearing and abrasion, which extends the lifespan of the filter bags.
• Chemical Resistance: Polyester fibers exhibit good resistance to many acids and alkalis, making them suitable for use in harsh chemical environments.
• Solvent Resistance: Polyester fibers are resistant to a wide range of solvents, enhancing their applicability in various industrial processes.
• Thermal Stability: Polyester fibers can operate effectively in temperatures up to approximately 130°C(266℉) .
• Moisture Resistance: Polyester fibers inherently repel water, making these filter bags effective in applications where moisture is present.
• Cleanability: Polyester filter bags can be cleaned and reused multiple times, reducing operational costs.

Technical Advantages of  Polyester Filter Bags in Filmedia®

• To increase system filtration capacity by 50-150% as needed without major changes to the dust collectors.
• System cleaning efficiency markedly increased with the effective increase of bag to bag distance.
• Bag life extended due to significant reduction of fatigue damage to the bags due to bag to cage impact.

Post-treatment of Polyester Filter Bags

For polyester filter bags, we can treat it with different post-processing according to different working conditions. There are mainly the following post-processing treatments:
1. Anti-Static (line type, cross line type, blend type).
2. Anti-Spark.
3. Water & Oil Repellent.
4. Anti-Abrasion (Acrylic coating).
5. PTFE Membrane.
6. PTFE Impregnation.

Shapes and Types

Polyester filter bags can be made into different shapes, which can be mainly divided into the following three types:
1. Round type.
2. Flat type.
3. Star/pleated type.

Round Type

Flat Type

Pleated Type

According to different working principles, polyester filter bags can also be made into the following three types:
1. Pulse jet filter bag.
2. Reverse air filter bag.
3. Shaker filter bag.

Application of Polyester Filter Bags

Because polyester filter bags have high tensile strength, chemical resistance, and the ability to operate at moderately high temperatures, they are versatile and reliable in a variety of industrial environments.

• Cement and Asphalt Production: Helps in capturing dust and particulates emitted from kilns and dryers.
• Water Treatment: Utilized in municipal and industrial water treatment plants for removing contaminants from water.
• Chemical Processing: Used to filter liquids in chemical manufacturing processes, ensuring product purity and protecting equipment.
• Food and Beverage Industry: Applied in the production of beverages, syrups, and other consumables to filter out impurities and particulates.
• Air Filtration: Incorporated in heating, ventilation, and air conditioning systems to improve indoor air quality by trapping dust, pollen, and other airborne particles.
• Pharmaceutical Industry: Used to filter and collect fine powders during the production of pharmaceuticals, ensuring compliance with health and safety regulations.
• Air Purification: Helps maintain sterile conditions in production and packaging areas.
• Tailings Management: Employed to manage and treat slurry from mining operations.
• Agriculture: Used in grain elevators and processing plants to filter dust and fine particulates generated during handling and milling.
• Paint and Coatings Industry: Helps in collecting overspray and maintaining clean air within coating booths.
• Mixing and Blending: Ensures air quality during the mixing and blending of raw materials.
• Metalworking: Filters out welding fumes and metal particles as well as metal dust generated during grinding and polishing operations.
• Woodworking: Essential in woodworking shops to capture sawdust and wood particles, improving air quality and reducing fire hazards.

We Pay Attention to Every Processing Detail

• Accurately design the size of the filter cloth required for the filter bag. The filter cloth will be larger than the actual design size to leave enough operating space.
• Choose the right filter bag accessories and check their quality.
• We draw, cut and sew the filter bags on an automatic production line. When the filter bag needs to be processed manually, we open it on the operating platform and use a certain pulling force to keep it flat.
• We maintain strict processing quality standards in accordance with design drawings and operating procedures. Our workers dress in compliance with safe construction requirements and are prohibited from smoking.

Qualifications of PE Series Products:  SGS of PE series products