Designing Waist Belts

本研究旨在探讨松紧带的腰部松紧度。将2 ~ 5cm宽的弹性腰带用20种不同拉伸和压缩性能的织物包裹。使用了292种不同机械性能和带织物长度的腰带。23名女性在腰围5处贴上空气包，测量腰带压力，判断站立和坐姿时腰带的舒适性。弹性腰带的拉伸应变、拉伸能、拉伸回弹率、压缩能和厚度随着腰带织物的变长而增大。腰带对人体的舒适压力在腰际（除中背外）为0.5 ~ 1 kPa。在相同的带织物的情况下，所需的腰部松弛度降低到带织物的长度与弹性体的长度的比率为1.5：1，并且其逐渐增加。窄窄的弹性腰带，舒适范围很广。此外，还利用腰带宽度、拉伸应变、厚度、压缩率、腰围、侧腰围上下夹角等参数，得到了较为准确的腰部舒适度预测方程。

The purpose of this research is to investigate the proper amount of waist ease in elastic belts. The elastic waist belt of 2 to 5 cm width was wrapped in 20 fabrics with different tensile and compression properties. Two hundred ninety-two kinds of waist belts, which differed in mechanical properties and belt fabric length, were used. Twenty-three women, who attached the air pack at 5 points of the waistline to measure the pressure from waist belt, were requested to judge the comfort of the waist belts in the standing and sitting postures. The difference between the length of belt and the waist girth was defined as the waist ease.As the belt fabrics became longer, the tensile strain, the tensile energy, the tensile resilience, the compression energy and the thickness increased in the elastic waist belts. The comfortable pressure from waist belt at the waistline except for the center back showed a 0.5 to 1 kPa. In case of the same belt fabrics, the necessary waist ease decreased up to the ratio 1.5 : 1 of the length of the belt fabric to the elastic, and it gradually increased. The narrow elastic waist belt had a wide comfortable range. Moreover, a considerable accurate prediction equation for comfortable waist ease was obtained using the belt width, the tensile strain, the thickness, the compression rate, the waist girth, and the angle of upper and lower portion at the side waistline.