所谓热收缩薄膜就是指该薄膜在加热的情况下会发生自动收缩的一种包装薄膜,它是以高分子量聚烯烃为主要原料,在熔融状态下,对其施加一定的外力,迫使它卷曲的高分子链段得到伸展,然后冷却定形,把伸展的分子链段固定了下来,即“冻结”了下来。这种伸展的链段是处于一种不稳定的状 The so-called heat-shrinkable film refers to the film in the case of heat will automatically shrink a packaging film, which is a high molecular weight polyolefin as the main raw material, in the molten state, to exert a certain external force to force it curly The polymer chain stretch, and then cooling shape, the stretch of the molecular chain fixed down, that is, “frozen” down. This stretch of the segment is in an unstable shape