热收缩膜采用高取向分子链拉伸定向原理设计，以急冷定型的方法成型。其物理原理是：当离聚物处于高弹态时，对其拉伸取向，然后将 高聚物骤冷至玻璃化温度以下，分子取向被冻结，当对物品进行包装过程中对其加热时，由于分子运动产生应力松驰，分子恢复原来的状态，产生收缩。
The heat shrinkable film was designed by the principle of high orientation molecular chain stretching and orientation, and was formed by quenching method. The physical principle is that when the ionomer is in a high elastic state, it is oriented by stretching, then the polymer is quenched below the glass transition temperature, and the molecular orientation is frozen. When the ionomer is heated in the packaging process, the stress relaxation occurs due to the molecular movement, and the molecule restores its original state and shrinks.