The voltage withstand performance of insulating nonwoven fabrics mainly depends on the dielectric properties and structural design of the material itself. The purity of the fiber raw material is a fundamental factor; impurities or defects can become conductive channels, significantly reducing the material's voltage withstand capability. Polyester fibers, due to their stable molecular structure and high crystallinity, typically exhibit excellent dielectric strength; however, the presence of conductive components such as metal particles or carbon black in the fibers can have a negative impact. The uniformity of fiber diameter and length also directly affects the uniformity of the electric field distribution; uneven fiber arrangement may lead to localized electric field concentration, forming weak points for breakdown.

The moisture absorption properties of polyester nonwoven fabrics mainly depend on the hydrophobic properties of the fibers themselves and the microstructure design of the material. As a synthetic fiber, polyester fiber contains ester groups in its molecular structure, which gives it low moisture absorption. Under standard conditions, the moisture absorption rate of polyester fibers is typically low, allowing polyester nonwoven fabrics to maintain good dimensional stability and mechanical properties even in humid environments. However, this low moisture absorption also limits its performance in applications requiring rapid moisture absorption or permeability.

The raw material recycling process for polyester nonwoven fabrics mainly includes three methods: physical recycling, chemical recycling, and energy recovery. Physical recycling involves mechanically crushing, washing, melting, and regranulating waste nonwoven fabric to form reusable polyester granules. The key to this method is separating impurities and contaminants to ensure the purity of the recycled material. The washing stage is particularly important, requiring the use of specific solvents or water-based cleaning agents to remove oil and other deposits. Precise temperature control is necessary during the melting process to avoid excessive degradation of the polyester molecular chains. The advantage of physical recycling is its relatively simple process and low energy consumption, but the performance of the recycled material may be somewhat degraded.

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.