Effect of Percent Binder Fiber and Web Weight on the Physical Propeties of Thermally Bonded Nonwovens for Electrical Insulation, 1997 Nonwovens Conference Proceedings

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A study of the effects of percent binder fiber and web weight on the physical properties of thermally bonded carded nonwoven fabric for electrical insulation is presented. Fabric properties tested include breaking load, breaking elongation, toughness, stiffness, thickness, compression energy, recovery energy, compression resilience, specific clo, air permeability and dimensional stability. Statistical analyses were performed on all of the data from various nonwovens produced, including three blend levels of polyester fibers (Celbond K-54 binder fiber / Hollofil 808 filling fiber) and the three web weights.

The results obtained indicate that the breaking load and toughness significantly increases as the percent binder fiber in the blend increases. The data obtained for breaking elongation suggests that fabric breaking elongation decreases as the binder fiber in the blend increases. The web weight had no significant effect on the breaking elongation. The stiffness test results showed that for flexural rigidity the web weight alone has a positive effect. The KES test results showed that compression energy exhibits a significant variation with both binder fiber and web weight levels. Whereas, for recovery energy and compression resilience, the binder fiber alone has a positive effect. Results of the air permeability test showed that the air resistance increases with an increase of the percent binder fiber web weight. The regression analyses showed an excellent relationship of web weight and percent binder fiber with specific clo. However, the equation was a complexed one and difficult to interpret. No significant correlation was found for thickness, thermal resistance and dimensional stability.