High-barrier visible heavy-duty packaging composite film and production method thereof

Abstract

The invention discloses a high-barrier visual heavy packaging composite film which is composed of a lower surface layer, a middle core layer and an upper surface layer. The lower surface layer is composed of co-polypropylene and an adherent. The middle core layer is composed of homo-polypropylene, a deflection enhancer and a nucleating agent. The upper surface layer is composed of homo-polypropylene, a nucleating agent and an antiblocking agent. After adding the nucleating agent to the polypropylene, the crystallizing proportion and the refined crystals are improved by means of a water bath and tension, so that the mechanical property and the bearing property are improved greatly. After the crystals are refined, the transparency of the film is relatively high, the fog degree is relativelylow, and visualization is improved. By adding the deflection enhancer, gaps among the crystals can be fulfilled, so that the barrier performance of a product is improved.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a high-barrier visible heavy-duty packaging composite film and a production method thereof. Background technique [0002] With the advancement of chemical technology, the functional development trend of plastic packaging films is becoming more and more obvious. Among them, high-barrier plastic packaging films are one of the fastest-growing functional films. High-barrier film refers to a packaging film that protects the contents of the package from the infiltration of pollutants and small molecules such as oxygen, water vapor, liquids, and odors, and also prevents the contents of the package from seeping out. [0003] Traditional high-barrier films are usually made of aluminum-plastic composite films. Although they have excellent barrier properties, they need to be bonded several times with adhesives. Not only are there many processing steps, high costs, and great envi...

AI Technical Summary

Problems solved by technology

[0003] Traditional high-barrier films are usually made of aluminum-plastic composite films. Although they have excellent barrier properties, they need to be bonded several times with adhesives. Not only are there many processing steps, high costs, and great environmental pollution, they are not transparent and buyers cannot see them. It cannot be used in occasions that require transparent packaging materials, such as meat food packaging, dairy products, marinated products, bean products, sauces and other products