Theoretical and Experimental Studies on Thermal Properties of Polyester Nonwoven Fibrous Material

Abstract

Polyester nonwoven fibrous material is widely used in construction and automobile industries for thermal insulation purposes. It is worthy and meaningful to understand the effect of structural parameters on the thermal property. Fiber orientation, as one of the most vital parameters, has a significant effect on thermal property. However, there has been little quantitative analysis focusing on this aspect. This paper theoretically and experimentally analyzes the thermal conductivity of samples with varying fiber orientation. Existing models were selected to predict the thermal conductivity of polyester nonwoven samples. Two different apparatus were applied to carry out the experimental measurements. The relative differences between the predicted and measured results were compared. One commonly used model was modified for accurate prediction. It was shown that some existing models under- or overestimate the thermal conductivity compared to the measured values. The results indicate that the modified model can accurately predict the thermal conductivity of polyester nonwoven materials within a 0.2% relative difference.

Experimental and Modelling Studies on Thermal Insulation and Sound Absorption Properties of Cross-Laid Nonwoven Fabrics

“…All of the parameters are very easy to be obtained except thermal conductivity of fiber. The thermal conductivities of polyester are collected in one paper for thermal properties study of perpendicular-laid nonwoven fabrics [26]. The values of thermal conductivity of polyester fiber adopted in this study is 0.140 W m −1 K −1 [27].…”

Wearable Textile UHF-RFID Sensors: A Systematic Review

“…Note that the FR4 substrate is so rigid that it cannot be bent easily, meanwhile the polyimide substrate needs to be tested in a bending condition. Compared to the FR4 substrate and polyimide substrate, the textile substrate [44] has to face the challenges of not only the bending impact but also the environmental impacts such as humidity and temperature. However, due to the universality of textile materials in human life, the textile UHF-RFID sensors have a good application foundation.…”

“…Certainly, the common materials, PCB, can be applied for multi-sensor structures in terms of multi layers, as shown in Figure 4a, which also gives textile UHF-RFID sensors a novel research orientation towards multi-layer structures with flexible and comfortable features. [45]); (b) UHF-RFID tag with polyimide substrate (adapted from [40]); (c) UHF-RFID tag with 50% cotton and 50% polyester substrate (adapted from [44]).…”

“…The material of the substrate, as shown in Figure 4 a, is FR4, one type of the rigid PCB, which is different with the polyimide, one type of the flexible PCB (FPCB), as shown in Figure 4 b, and the 50 % cotton and 50% polyester, one type of the mixed textile, as shown in Figure 4 c. Note that the FR4 substrate is so rigid that it cannot be bent easily, meanwhile the polyimide substrate needs to be tested in a bending condition. Compared to the FR4 substrate and polyimide substrate, the textile substrate [ 44 ] has to face the challenges of not only the bending impact but also the environmental impacts such as humidity and temperature. However, due to the universality of textile materials in human life, the textile UHF-RFID sensors have a good application foundation.…”

“… Three typical materials of the substrates. ( a ) Voltage and current sensor with FR4 substrate (adapted from [ 45 ]); ( b ) UHF-RFID tag with polyimide substrate (adapted from [ 40 ]); ( c ) UHF-RFID tag with 50% cotton and 50% polyester substrate (adapted from [ 44 ]). …”