Abstract
The fraunhofer patterns of warps and fillings of silk fabrics were discussed in relation to the structure of the fabrics.
1. Fraunhofer patterns of warps are the convolution of those from each warp.
2. The patterns of degummed and finished warps and fillings indicate partially the structural elements of the fabrics.
3. The patterns from warps reflect the fabric structure more clearly than those from fillings.
4. Fraunhofer analysis of the object shows a specific diffuse pattern, while the irregularity was shown by the observation by a microscope. The patterns of fabrics are similar to the convolution of those of warps and those of fillings set at right angle.
5. Coupled X-ray diffraction and fraunhofer analysis are very useful to clarify the fabric structure.
6. The twist angle and the corresponding molecular chain orientation angle were measured by means of fraunhofer and X-ray diffractions, respectively. The ratio of them was found to be 0.5 for silk organzine yarn and 0.6 for nylon organzine yarn.
