How to choose PE plastic packing film

Answer:

Transmittance and haze are important indexes that determine the visibility and clarity of packaged goods, and have a great influence on the display effects of goods. Transmittance and fog are expressed as percentages. The greater the transmittance, the better the transparency of the film; and the greater the haze, the greater the opacity of the object through the film, the less clarity.

The barrier properties of plastic film to prevent performance of oxygen, carbon dioxide, nitrogen and other gases, water vapor and aroma substances through, without clear scope, more commonly refers to oxygen, carbon dioxide, nitrogen and other non-polar gas barrier. The effect of plastic film on the display of goods is closely related to the transmittance, haze, gloss, antistatic and printing properties of the film itself. It is necessary to pay enough attention to the light transmittance and fog.

Welding strength is also a necessary condition for plastic film bags to protect goods reliably. If the weld strength is not enough, the weld will become the fatal weakness of the plastic film bag, and the plastic bag will lose the protection to the goods because of the rupture of the weld seam.

To prevent the leakage of goods in the packaging or outside material into the packaging, the destruction and pollution of goods. The performance index of the mechanical protection function of plastic film is mainly the mechanical strength of film, such as tensile strength, tear strength, impact strength of falling object (drop mark impact), anti puncture strength and so on.

As a packaging material, plastic film is the most important and basic function for the protection of goods. If the plastic film has no reliable protection against the packaged goods and causes damage or depreciation of the goods, it will lose its value as a packaging material. The protective function of plastic film for goods is various. Different commodities and different packaging forms have different emphases on the protection function of plastic packaging film.