ricsIn this paper, drape coefficients and mechanical properties of 138 samples of woven fabrics are measured, and the relation between them is analyzed by means of residual-regression method. A linear equation by which the drape coefficient can be calculated from the mechanical properties is presented.As a result, it is shown that the value given by B/W is most related with the drape coefficient, where B is bending rigidity (g•cm2/cm), W weight per unit area of fabric (mg/cm2).Next, the anisotropy in the bending property of fabric is examined, and we get an equation for the drape coefficient, by means of multiple regression method; D,=5.1+115.0 where B90 is bending rigidity (g~cm2/cm) along warps, B0 along wefts, and 845 in bias directions.Finally, the stability of the drape shape is examined. It is found that as the hysteresis in fabric shearing and bending is large, the instability in the drape coefficient increases. From this fact, the experimental technique of drape testing is also discussed.
In this study, the relation between pressure values and the feeling of pressure of the top part of men's socks (hereafter, the top) is investigated to design and develop socks that provide wearing comfort. Leg size, tensile properties and pressure values of the top are measured, and the pressure feeling is evaluated. When the tops of men's casual socks are stretched to a certain extent this induces stress relaxation and the feeling of pressure changes depending on wearing time. In this study, a certain stable pressure value is observed 2 hours after wearing the socks. The pressure value of the anterior surface of the leg has a great influence on the feeling of pressure. The pressure value of the top when the subjects feel "comfortable" is 2.02 & p l u s m n ; 0.29 kPa. Furthermore, the minimum girth of the lower leg and the girth of the heel influence the wearing comfort of socks.
We have developed a mechanical hybrid yam spinning system that produces different kinds of yam on a modified open-end rotor spinning frame. In order to understand the characteristics of hybrid yam and produce novel yarns, it is necessary to investigate yarn formation and the twisting mechanism in the spinning rotor during yam production. Our results reveal that the rotor revolution generally results in combining the filament yam and the staple fiber strand. The fiber twist angle of the strand in a hybrid yarn is smaller than that of a rotor spun single yam with the same spinning conditions. Although a fed filament yam has a false twist inserted by increasing the filament over-feed, the filament yarn in the hybrid yarn has a smaller level of fiber twist angle in the same direction as the twist of the staple fiber strand due to untwisting of the false twist.
Vol. 29, No. 9,p. 426-437 (1976) To find out factors which contribute to easy handling in making-up and to a good appearance in finished garments, mechanical properties of fabrics such as extension, bending, shearing, compression, friction and surface contour were measured.On the other, eighteen making-up personnels classified the fabrics according to the easiness in making-up and their appearance. The results are summarized as follows:1) Easy handling in making-up fabrics can only be obtained within small ranges in tensile, bending, shearing and compressional properties. Larger ratio of plasticity to elasticity in bending and shearing properties gives more easiness.2) The mechanical properties of fabrics having a good appearance in finished garments lie almost in the same range' as fabrics having good hand, or close to those of fabrics easy for handling in making-up. Further, the complex physical properties in the gravitational field contribute to a good appearance in finished suits.3) Fabrics easy for handling in making-up and fabrics having a good appearance in finished suits have moderate take-in and settability.
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