Tests were carried out with a gonio-photometer to investigate optical properties of silk-like synthetic fiber fabrics. To compare silk-like fabrics with natural silk fabrics, habutai and crepe de chine of silklike synthetic fibers as well as those of natural silk fibers were used as samples. The following results were obtained :1. The difference in optical properties of silk-like and natural silk fabrics can be distinguished by comparing their reflected light distribution curves and quantity of reflection obtained by revolving specimens.2. Little differences have essentialy been found between silk-like and natural silk fabrics. However a detailed observation has revealed that a silk-like fabric has little amount of diffused reflected light and the specular reflected light of a silk-like fabric tends to gather. This causes the visual sensory differences in luster.3. Sensory tests were carried out of a difference in luster of a silk-like and a natural silk fabric. The crepe de chine of a silk-like synthetic fibers can be distinguished from that of natural silk fibers by the difference of degree of creping. By contrast, a habutai of silk-like synthetic fibers can not completely be distinguish from that of natural silk fibers. In other words, a habutai of polyester fibers is much similar in visual luster to that of natural silk fibers.
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