A high-barrier high-temperature-resistant packaging film that does not roll after sterilization

Abstract

The invention discloses a high-barrier high-temperature-resistant packaging film capable of avoiding curling after sterilization. The packaging film comprises an upper film and a lower film, wherein physical crosslinking treatment is performed on the upper film to enable the melting point to reach 180-190 DEG C; the upper film comprises a CPP (chlorinated polypropylene) layer, and a first bonding layer, a first PA (polyamide) layer, an ink layer, a second bonding layer and a PE (polyethylene) layer which are sequentially arranged on the lower surface of the CPP layer; the lower film comprises a CPP layer, a third bonding layer and a nine-layer coextrusion layer; and in a heat sealing process of the upper film and the lower film, the PE layer of the upper film and the nine-layer coextrusion layer of the lower film are combined through heat sealing. Through the physical crosslinking treatment on the surface of the upper film, the melting point of the upper film can reach 180 DEG C or so; in the current sterilization and disinfection environment, the smoothness of the film can be kept, and the film can not curl; since the nine-layer coextrusion layer is used and multiple PE layers are arranged in the nine-layer coextrusion layer, the controllable thickness of each layer is realized on the premise of keeping an overlaying function, thereby realizing controllable cost; and since an EVOH (ethylene vinyl alcohol) layer and a PA layer are arranged, the EVOH layer has very strong barrier property, and the PA layer has puncture resistance.

Description

technical field

[0001] The invention relates to a packaging film, in particular to a high-barrier, high-temperature-resistant packaging film that does not roll after being sterilized. Background technique

[0002] Existing food packaging films, such as the packaging film for desktop sausages, have an upper film and a lower mold. After the sausage is packaged, the packaging film is prone to curling, especially after sterilization and disinfection. The main reason is that the sterilization process requires Higher temperature, while the melting point of the current packaging film is 120 degrees, so it is easy to curl during the sterilization process. Contents of the invention

[0003] In view of the above problems, the present invention provides a high-barrier high-temperature-resistant packaging film that does not roll after sterilization. The melting point of the upper film can reach about 180 degrees by physically cross-linking the surface of the upper film. In the current...

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