“膨松度”的英语？

导热系数随体积密度增加而降低,在单位面积重量相同条件下,膨松度高的非织造布.The heat conduction coefficient decreases with increasing the bulk density of nonwoven fabrics.复卷线速度无级调控,卷纸膨松度可控制.Stepless regulates and controls linear velocity of rewinding to mate...

“膨松度”的拼音为：péng sōng dù...