Moisture-retarding, oxygen-blocking and flavor-retaining packaging film with anti-fog function

Abstract

The invention discloses a moisture-retarding, oxygen-blocking and flavor-retaining packaging film with an anti-fog function. The moisture-retarding, oxygen-blocking and flavor-retaining packaging film comprises a coextrusion blow molding film; the coextrusion blow molding film comprises at least two moisture-retarding layers, at least one oxygen-blocking layer and adhesive layers, the oxygen-blocking layers are sandwiched among the moisture-retarding layers, and the oxygen-blocking layers and the moisture-retarding layers which are adjacent to one another are adhered with one another by the adhesive layers; each oxygen-blocking layer comprises at least one EVOH (ethylene-vinyl alcohol copolymer) resin layer; and the moisture-retarding layer on the surface of one side of the coextrusion blow molding film is an anti-blocking, anti-fog and moisture-retarding layer, and anti-fog agents, slipping agents and anti-blocking agents are added into the anti-blocking, anti-fog and moisture-retarding layer. The film further can comprise an outer base material film which is compounded with the surface of the other side of the coextrusion blow molding film by means of hot pressing. The packaging film is excellent in anti-fog property, barrier property and curling resistance, high in identification degree and low in cost, and can be used for packing food such as frozen meet and chilled fresh meat.

Description

technical field [0001] The invention relates to a packaging film, in particular to a moisture-resistance, oxygen-resistance and fragrance-preserving packaging film with an anti-fog function, and belongs to the technical field of flexible packaging films. Background technique [0002] In recent years, with the improvement of people's living standards, people have put forward higher and higher requirements for the quality of food packaging. Among the increasingly functional food packaging films, high-barrier plastic packaging films are currently one of the fastest-growing functional films. High barrier packaging film can realize the function of blocking moisture and oxygen, avoiding the infiltration of pollutants, water vapor and oxygen, etc., and at the same time preventing the leakage of the packaged objects; Under standard conditions, oxygen transmission rate <5ml / m 2 ·day, water vapor transmission rate <2g / m 2 day. By selecting a special resin material for the ba...

AI Technical Summary

Problems solved by technology

However, frozen meat and cold fresh meat are generally stored in freezers and fresh-keeping cabinets. When there is a temperature difference between cold and hot due to the choice of the operator of the freezing plant or the customer or due to other factors, the surface of the packaging film is easy to form fog; Once the water mist on the side of the packaging film close to the package is formed, it is difficult to remove, making it difficult for subsequent employees or customers to see the food inside through the packaging film

[0004] Most of the anti-fog films on the market, by setting one or more layers of anti-fog layers on the surface of the film, although they can reflect good anti-fog properties after 24 hours of temperature difference change, but after a short period of time after the temperature difference change, such as 0 The anti-fog effect is not ideal within ~24h

In addition, in the published patent documents on barrier packaging films with anti-fog function, such as the Chinese patent document with authorization number CN202283804U, most of the barrier effects discussed only involve moisture barrier and oxygen barrier properties. less involved

In addition, the surface of the conventional anti-fog film lacks a printing layer, and the packaging can only be identified by labeling the outside

Images