Multilayer heat shrinkage film
A heat shrinkable film and outer layer technology, applied in the field of packaging materials, can solve the problems of reducing production efficiency, increasing processing steps, increasing costs, etc.
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Embodiment 1
[0096] With the raw materials and proportions shown in Table 1, the raw materials used in each layer are first co-extruded into a multi-layer billet tube by means of multi-layer co-extrusion, and then the co-extruded multi-layer billet tube is passed through a warm water bath at 90°C Post-foam blown film, biaxially stretched 3.2 times in the machine direction (MD) and 3.6 times in the transverse direction (TD), then cooled to 15°C with air, and the cooled biaxially stretched The stretched multi-layer heat-shrinkable film is rolled up for further processing. All processed tube-packed films are processed into a width of 350mm for inspection.
[0097] The raw material ratio of embodiment 1~embodiment 9, comparative example 1~5 is shown in Table 1;
[0098] The heat-shrinkable films prepared in Comparative Examples 2 and 3 were treated by an electron accelerator with an intensity of 5 MRad.
[0099] The process parameters of Examples 1 to 9 and Comparative Examples 1 to 5 are sh...
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