那男孩把纸袋吹胀后又把它弄破了。
本文介绍了热收缩套管的收缩机理及成型方法，如气压吹胀法、机械扩张法和缠绕法等。
This article introduces the shrinking mechanism and molding process of heat-shrinkable tubes, Such as air inflation, mechanical expanding and winding etc.
文中深入研究了从管坯到薄膜吹胀成型过程中的厚度分布变化和半径分布变化，并给出了结论。
In this paper, deeply research was made from tube semifinished product to bubble which is about distribute of radius and thick, and draw own conclusion.
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