The shear vibration of shingosen fabrics of polyester fiber has been measured precisely. The results have been analyzed in terms of new mechanical parameters of shear vibration. As a result, it has been shown that the shear vibration of new silky, rayon touch, and peach face type shingosen fabrics, according to the conventional shingosen classification, continued longer than that of new worsted type shingosen fabrics. They continued, however, shorter than that of natural silk filament fabrics. In the classification of production characteristics, the shear vibration of yarn-processing type shingosen fabrics continued shorter than those of fabric-finishing and fiber-production type. In the classification of fiber characteristics, the shear vibration of shingosen fabrics of contractile, irregular cross-section, and ultra-fine fibers type continued for a long time and that of crimped fiber type is the shortest. Those features of shingosen fabrics in the shear vibration became more distinct by discriminant analysis in terms of parameters of the shear vibration as variables. Parameters of the shear vibration of shingosen fabrics had no correlation with the drape coefficient.

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A folding process is necessary for tucking and gathering of a fabric. In this study, a change of shape after gathering has experimentally been investigated by the use of eight kinds of fabrics with different shape of loop in relation to the crease recovery. As a result, it has been shown that fabrics with crease recovery below 60% leave a crease after pressing only with a load of 50gf/cm² for five seconds and is desirable for tucking. On the contrary, fabrics with crease recovery more than 70% do not leave a crease after pressing even with a load of 500gf/cm² for five seconds and is desirable for gathering. These results have been confirmed by gathering four kinds of fabrics.
The roundness of loop (φ) can approximately been expressed by the equation:
φ=0.46sin (0.96CR),
where, CR: crease recovery in %.

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