Polyester Needle Punched Filter Felt: How to improve its air permeability?

1. Optimize fiber structure and arrangement
The air permeability of Polyester Needle Punched Filter Felt is first affected by its fiber structure and arrangement. The diameter, length and interweaving density of the fiber jointly determine the air permeability of the material. In order to improve the air permeability, optimization can be carried out from the following aspects:

Select fine denier fiber: Fine denier fiber has a smaller diameter and can form more fiber channels per unit area, thereby increasing the path for air circulation. At the same time, fine denier fiber can also improve the softness and wear resistance of the material and extend its service life.
Optimize fiber arrangement: By adjusting the parameters of the needle punching process, such as needle punching frequency, depth and angle, the arrangement of the fibers can be optimized to form a more uniform and open pore structure between the fibers. This structure is conducive to the free flow of air and reduces flow resistance.
Increase fiber interweaving points: Appropriate fiber interweaving points can enhance the overall strength of the material while maintaining a high porosity. By precisely controlling the needle punching process, the structural stability of the material can be improved without sacrificing air permeability.
2. Surface treatment technology
Surface treatment is another effective way to improve the air permeability of Polyester Needle Punched Filter Felt. Through treatment technologies such as singeing, calendering, and coating, the surface morphology and performance of the material can be improved, thereby improving its air permeability.

Singeing treatment: Singeing can remove burrs and fiber bundles on the surface of the material, making the surface smoother and flatter. This helps to reduce resistance during air flow and improve permeability.
Calendering treatment: Calendering makes the surface of the material tighter through mechanical pressure while maintaining a certain porosity. This treatment can improve the air permeability and wear resistance of the material and extend its service life.
Coating treatment: Choosing appropriate coating materials and technologies can improve the surface performance and filtration efficiency of the material without blocking the pores.
3. Material and structural design
In addition to fiber structure and surface treatment, the material and structural design of Polyester Needle Punched Filter Felt are also key factors affecting its air permeability.

Multi-layer structure design: The multi-layer structure design can optimize the air permeability through fiber arrangement and density adjustment at different levels without increasing the thickness of the material. This design can maintain high filtration efficiency while reducing flow resistance.
Base fabric reinforcement: Adding high-strength base fabric to needle-punched filter felt can enhance the overall strength and stability of the material while maintaining high porosity and air permeability. The selection and arrangement of base fabrics should be adjusted according to specific application scenarios.
Aperture optimization: By adjusting the needle punching process and fiber selection, the pore size distribution of the material can be optimized. A reasonable pore size structure can improve air permeability and reduce energy consumption while ensuring filtration efficiency.