Classification and Application of Primary Air Filter Media

The Application of Polyester Synthetic Fiber Air Filter Media

Polyester Synthetic Fiber Air Filter Media has a wide range of applications, and it is generally referred to as air filtration material. According to the different materials used, Polyester Synthetic Fiber Air Filter Media can be divided into four types: synthetic fiber filter media, non-woven fabric filter media, glass fiber filter media, and activated carbon filter media.

Polyester Synthetic Fiber Air Filter Media can also be categorized based on its filtration efficiency, which includes: pre-filter media, medium-efficiency filter media, and high-efficiency filter media.

1.Synthetic Fiber Filter Media

 Polyester fiber filter media can comprehensively replace non-woven fabrics and fiberglass fiber filter media in general filtration environments. It covers the full range of filtration products from primary, medium, to high-efficiency filters. It is an emerging filtration material and also a major development direction for future filtration materials. Compared to other filter materials of the same grade, it has advantages such as low resistance, light weight, large capacity, environmental friendliness (incinerable), and moderate price.

It uses polyester fiber (PET) as the main raw material. Polyester fiber is made from polyethylene terephthalate, also known as synthetic fiber or polyester. The specific gravity of polyester fiber is 1.38, with a melting point of 255-260°C. It begins to bond at 205°C, and the safe ironing temperature is 135°C. Its water absorption is low, only 0.4%. The breaking strength of the filament is 4.5-5.5 g/den, while the short fiber is 3.5-5.5 g/den. The breaking elongation of the filament is 15-25%, and for short fibers, it is 25-40%. The strength of high-strength fibers can reach 7-8 g/den, with elongation ranging from 7.5% to 12.5%.

Polyester has excellent wrinkle resistance, elasticity, and dimensional stability. It also has good electrical insulation properties, is resistant to sunlight and friction, does not mold or rot, and exhibits good resistance to chemical reagents. It can withstand weak acids and weak alkalis. In the industry, it is referred to as chemical fiber. There are two types of chemical fibers: large chemical fibers and small chemical fibers. Large chemical fibers are made from high-quality PET chips, while small chemical fibers are produced by some small and medium-sized manufacturers using recycled PET chips of lower quality.

2.Non-woven Fabric fiber filter media

The scientific name is polyester fiber, commonly known as non-woven fabric. Non-woven fabric is widely used, with mature technology and good stability. It is a typical filtration material for pre-filter and medium-efficiency panel or bag filters in China. The manufacturing process involves multiple steps, such as melt-blown, needle-punching, water-pulping, and spunbonding. Compared to other filter materials of the same grade, non-woven fabric has advantages such as stable quality, large dust-holding capacity, strong moisture resistance, long service life, and durability at a reasonable cost.

Non-woven fabric is also one of the earliest filtering materials used. The technology has matured, and production costs are low. In recent years, with continuous technological advancements, the emergence of composite non-woven fabric has significantly improved the low-cost, low-quality image of traditional non-woven fabrics. It now offers efficiency that can reach sub-high-efficiency levels. Additionally, composite non-woven fabric materials can be used in places that require relatively high air cleanliness for filtration.

3.Glass Fiber Filter Media

Glass fiber filter media is primarily made from various types of glass fibers with different thicknesses and lengths, processed through special techniques. Glass fiber is known for its stable performance, high-temperature resistance, high capacity, and long service life. In certain special environments, only glass fiber can meet the requirements. It is widely used in pre-filters for general ventilation systems, high-temperature filters, and high-efficiency filters in places and environments with high air filtration requirements.

4.Activated Carbon Fiber Filter Media

The characteristic of activated carbon is its ability to remove odors from the air. Activated carbon fiber filter media refers to synthetic fibers that have been treated with carbon impregnation and adhesive. Since the primary function of activated carbon is to eliminate odors, filtration efficiency is not the main focus. Typically, activated carb on fiber filter media is used in conjunction with independent pre-filters and medium-efficiency filters for optimal performance.