The influence of the constructing conditions of quilted fabrics on the fabric properties was discussed. The results were as follows:
(1) The thermal insulation value of quilted fabrics increased with the number of layers of nonwoven fabrics and the spacing between stitched lines. The observation of the surface temperature of quilted fabrics by thermography supported the results mentioned above. Stitched lines in quilted fabrics have a function to increase heat loss to the ambient air.
(2) Percentage of water vapor transmission through a quilt decreased with the number of layers of nonwoven fabrics and the spacing between stitched lines. There was a tendency that the stitched lines in quilted fabrics increased the water vapor transmission.
(3) The average thickness of a quilted fabric was numerically calculated. It was shown that the average thickness was very influential on both the characteristics of the thermal insulation and the water vapor transmission.
(4) There was a linear relationship between the thermal insulation value and the percentage of water vapor transmission. It was suggested that the mechanism of heat diffusion through quilted fabrics was similar to that of water diffusion.
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