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

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a resealable polyolefin film, a composite cover film and a preparation method thereof. Background technique [0002] In recent years, bowl-shaped, cup-shaped, barrel-shaped and box-shaped packaging containers have developed rapidly, such as: fresh vegetables, various seasoning sauce packaging, convenient cooked food, Chinese patent medicine packaging, etc. The common feature of such packaging is that they all need to be covered. Membrane materials, at present, the cover film cannot be repeatedly sealed well, and some can only cover a little, but cannot be sealed more smoothly. [0003] Resealable food is easy to store and carry, and it is very convenient for consumers to use. However, some existing packaging solutions need to add functional components to achieve resealable effects. This is not only in packaging production In addition, most of these packag...

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Problems solved by technology

[0002] In recent years, bowl-shaped, cup-shaped, barrel-shaped and box-shaped packaging containers have developed rapidly, such as: fresh vegetables, various seasoning sauce packaging, convenient cooked food, Chinese patent medicine packaging, etc. The common feature of such packaging is that they all need to be covered. Membrane materials, at present, the cover film cannot be repeatedly sealed well, and some can only cover a little bit, but cannot be sealed more smoothly

[0003] Resealable food is easy to store and carry, and it is very convenient for consumers to use. However, some existing packaging solutions need to add functional components to achieve resealable effects. This is not only in packaging production In addition, most of these packaging solutions are only suitable for bagged food, and it is difficult to apply to a wider range of products. Based on the above, a composite cover film with a simple structure and resealable properties has been developed. greater practical significance

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