Polyolefin film capable of sealing repeatedly, composite cover film and preparation method thereof

The invention belongs to the technical field of packaging materials, and in particular relates to a polyolefin film capable of sealing repeatedly, a composite cover film and a preparation method thereof. The composite cover film comprises an outer layer, a barrier layer and a polyolefin film. The polyolefin film is composed of a corona layer, an intermediate layer and a hot seal layer. The polyolefin film has good mechanical strength and mechanical property while having good barrier property, not only meets the packaging sealing property, but also is opened conveniently. The polyolefin film can seal repeatedly if being opened, and the using safety is not affected as a result of chips by means of cracking. 本发明属于包装材料技术领域，尤其涉及到种可重复封合的聚烯烃薄膜、复合盖膜及其制备方法；其中，复合盖膜包括外层、阻隔层、聚烯烃薄膜，聚烯烃薄膜由电晕层、中间层和热封层构成，在具有良好阻隔性的同时，也具有良好的力学强度和机械性能，既能满足包装的密封性，又能方便开启，开启后可以再重复封合，不发生碎裂产生碎屑而影响使用安全。