What is the core insulation principle of 7031 electrical polyester fiber nonwoven fabric?

2025-12-03 13:57:27

The insulation performance of 7031 electrical polyester fiber nonwoven fabric primarily stems from its inherent dielectric properties and structural design. As a polymer material, polyester fiber possesses high resistivity, effectively preventing current flow and thus providing insulation. The ester bonds and benzene rings in its molecular structure provide a stable electron distribution, reducing charge migration and accumulation, further enhancing the insulation effect. The fiber arrangement of the nonwoven fabric creates a porous structure, which not only reduces the material's density but also increases the air content. Since air is also an excellent insulating medium, this porous structure further improves the overall insulation performance. The interlacing and entanglement between fibers reduce the possibility of electric field concentration, preventing partial discharge or breakdown. Furthermore, the chemical stability of polyester fiber allows it to maintain high insulation performance even in humid or polluted environments, resisting degradation due to moisture absorption or chemical corrosion.

The material's insulation performance is also closely related to its surface properties. The surface of 7031 electrical polyester fiber nonwoven fabric is typically specially treated to enhance its hydrophobicity and anti-fouling capabilities. This treatment reduces the adhesion of moisture and contaminants to the material surface, preventing a decline in insulation performance due to increased surface conductivity. The diameter and length of the fibers also affect insulation performance; finer, more uniform fibers form a denser structure, reducing the risk of electric field concentration. Simultaneously, the thermal stability of the fibers ensures that the material maintains good insulation performance at high temperatures, preventing failure due to thermal expansion or softening.

In electrical equipment, insulating materials need to withstand long-term electric field effects; therefore, the material's corona resistance is particularly important. 7031 electrical polyester fiber nonwoven fabric, due to its uniform fiber distribution and stable chemical structure, effectively resists corona discharge erosion. Corona discharge causes gradual deterioration of the insulating material surface, but the corona resistance of polyester fibers can slow down this process, extending the material's service life. Furthermore, the material's mechanical strength indirectly affects insulation performance, as mechanical damage can lead to the destruction of the insulation layer; the high strength and flexibility of polyester fibers reduce this risk.

The insulation performance of 7031 electrical polyester fiber nonwoven fabric is also closely related to its manufacturing process. High-quality manufacturing processes ensure uniform fiber distribution and structural stability, preventing uneven insulation performance caused by process defects. The purity of materials and the selection of additives also affect insulation performance; impurities or inappropriate additives can become conductive pathways, reducing insulation effectiveness. Therefore, strict process control and material selection are key factors in ensuring the insulation performance of 7031 electrical polyester fiber nonwoven fabric.