The characteristics of the packaging bag determined by the characteristics of the plastic packaging film
Release time:
2019-02-20
The characteristics of the plastic packaging film determine the characteristics of the packaging bag. In this article, we will talk about the material related to the packaging bag, which is also the packaging film we usually say.
The characteristics of the plastic packaging film determine the characteristics of the packaging bag. In this article, we will talk about the material related to the packaging bag, which is also the packaging film we usually say. A film is a two-dimensional form of a polymer characterized by a large surface area to volume ratio. The film should have yin permeability, can block any contaminating substances that want to enter it, and prevent the required substances from overflowing, that is, anti-diffusion. Plastic film is very thin, so it must have high mechanical properties such as tensile strength, impact properties and tear strength. The mechanical properties of the films generally depend on the molecular structure, molar mass and molar mass distribution. The visibility of the film is often important and therefore requires a low haze. These are the main properties of packaging films.
The appearance quality of the object packaged by the packaging film is often required, so the surface properties of the film such as gloss and printability are very important. The printability is related to the surface energy, and the surface energy is high to achieve wetting and maintain excellent adhesion. The modification can make the film have the appropriate surface energy. If the film friction is very small, it is also possible to improve the protective effect, this performance is called slip. When the film is used to encapsulate and protect the object, it is necessary to improve the adhesion to itself or to the object, which is referred to as viscosity. The polymer must therefore flow to produce sufficient adhesion. This is also when we need vacuum packaging bags, for example, we require vacuuming and good sealing performance. The need for aluminum foil bags is due to the need to avoid and other effects.
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