When choosing a high quality PE Film, we need to follow some basic functions of plastic packaging film, mainly for the protection function of products, promotion function etc. Considering the special needs,we choose some main properties to introduce as below

1. Protection function

As a packaging material, the protective function of plastic film is the most important and basic function. If the plastic film does not have a reliable protective effect on the packaged product, causing damage or devaluation of the product, it loses its use as a packaging material. The protective function of plastic film on commodities is multi-faceted. Different products and different packaging forms have different emphasis on the protection function of plastic packaging film.

2. Mechanical protection

Prevent the leakage of goods in the package or the damage and pollution of the goods caused by foreign substances entering the package. The performance index directly reflecting the mechanical protection function of the plastic film is mainly the mechanical strength of the film, such as tensile strength, tear strength, falling impact strength (drop impact) and puncture strength.

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3. Good welding strength

The welding strength is also a necessary condition for the plastic film bag to reliably protect the product. If the weld strength is insufficient, the weld will become the Achilles heel of the plastic film bag, and the plastic bag will lose its protection to the product due to the crack of the weld.

4. Barrier performance

The barrier property refers to the performance of the plastic film to prevent the transmission of gases such as oxygen, carbon dioxide, nitrogen, and the like, aroma, water vapor, etc., and when it is not clearly defined, it generally refers to the barrier of non-polar gases such as oxygen, carbon dioxide, and nitrogen. The effect of the plastic film on the product display is closely related to the light transmittance, haze, gloss, antistatic property and printing property of the film itself, and it is necessary to pay attention to the light transmittance and the haze.

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5. Light transmittance and haze

Light transmittance and haze are important indicators for determining the visibility and clarity of the packaged goods, and the relationship between the display effects of the products is particularly large. Both light transmittance and haze are expressed as a percentage. The larger the value of light transmittance, the better the transparency of the film. The larger the haze, the greater the turbidity of the object observed through the film, that is, the sharper the sharpness.

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