吹胀比 meaning in English

blow ratio
degree of blowup

For flat films , the cellulose chains are almost unoriented within the plane parallel to the film surface
另外，刮膜速度、拉伸比和吹胀比对膜强度和超分子结构的影响也很大。
With increasing blow up ratio , both the axial orientation and the crystallinity of tubular films increase . with increasing draw down ratio , only the axial orientation increases while the crystallinity does not change significantly
管膜的结晶度随吹胀比的增加而增大，当拉伸比增加时结晶度没有明显变化。