A kind of packaging film material and its application

Abstract

The invention relates to packaging film. The film comprises a first substrate layer (1), a heat insulation film layer (2), a first bonding layer (3), a second substrate layer (4), an antibacterial film layer (5), a second bonding layer (6), a third substrate layer (7) and a pH indicator film layer (8) which are disposed from bottom to up, the first substrate layer (1), the second substrate layer (4) and the third substrate layer (7) are of transparent materials, and the pH indicator film layer faces the side, facing packaged foods, of the packaging film. When the foods deteriorate, an acid oralkaline gas is usually released and absorbed by the pH indicator film layer to cause color changes, whether the foods in the packaging film deteriorate can be observed by external naked eyes under the condition that the packaging is not opened, convenience is provided for food materials of different fresh degrees to be classified and treated, and convenience is provided for management and selection. The heat insulation film and the antibacterial film layer help to prolong the shelf life of fresh foods, and the film can be applied to plastic film, food packaging bags, food transport packagingboxes, refrigerated containers, food storage bins and the like.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a packaging film material capable of indicating whether food is fresh and its application. Background technique [0002] Food safety is one of the main problems faced by international organizations. In most countries, especially industrialized countries, people pay more and more attention to food safety. Among them, the preservation technology of some foods with a short shelf life is also an issue that relevant practitioners attach great importance to, such as the preservation technology of fresh meat, fish and shrimp, and dairy products. As people invest more and more research, some degradable food packaging films or bags, bio-matrix material packaging films or bags, and food packaging films or bags with moisture-absorbing and anti-mildew functions have emerged as the times require. However, at present, there is no packaging bag that can indicate whether the food in...

AI Technical Summary

Problems solved by technology

However, at present, there is no packaging bag that can indicate whether the food in the package has deteriorated, so it is difficult for people to directly see whether the food has deteriorated without opening the package, causing some fresh food displayed in the supermarket to deteriorate. The situation is still sold, which not only brings a bad reputation to the supermarket, but also brings a bad shopping experience and loss to consumers.

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