Designing Waist Belts

这项研究的目的是调查弹性腰带中腰部放松的适宜量。将宽度为2~5 cm的弹力腰带包裹在20种不同拉伸和压缩性能的织物中。使用了292种不同力学性能和腰带面料长度的腰带。23名女性被要求在腰围的5个点安装气囊来测量腰带的压力，并要求她们在站立和坐着的姿势下判断腰带的舒适性。腰带长度与腰围之差定义为腰围，随着腰带面料变长，弹性腰带的拉伸应变、拉伸能、拉伸回弹、压缩能和厚度均增大。腰带的舒适性压力在腰线上，除中央背部外，为0.5~1kpa。对于相同的腰带织物，必要的腰部松弛降低到腰带织物长度与弹性的1.5：1，然后逐渐增加。狭窄的弹力腰带拥有宽广的舒适范围。此外，利用腰带宽度、拉应变、厚度、压缩比、腰围和侧腰线上下部分夹角，得到了较为准确的腰围舒适度预测方程。

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.