Processing and application of aluminized PET film (PET coating)

Aluminized PET film is made through a vacuum aluminum plating process, that is, in a high vacuum state, high-purity metallic aluminum is melted and evaporated into a gaseous state at high temperature (1200°C). After that, when the plastic film passes through the vacuum evaporation chamber, a thin layer Aluminum atoms are deposited on high-quality PET film to form a barrier composite flexible packaging film, which has the characteristics of both plastic film and metal. It is a cheap, beautiful, excellent performance, and practical film .

The aluminized film has good reflectivity to ultraviolet and infrared rays because among metals, aluminum has average reflectivity in visible light, but its reflectivity to ultraviolet and infrared rays is higher than that of most metals. Solar radiation can be divided into: Ultraviolet light, visible light, and infrared rays are three parts. Heat exerts its influence through infrared rays. Only infrared rays can make people directly feel the existence of heat. Its high reflective ability can reduce the transfer of external heat and at the same time play a role in affecting the internal temperature. Certain insulation effect. Due to the weather resistance of the PET film and the reflective effect of the aluminum coating (the ultraviolet transmittance of the PET film after aluminum coating is only less than 5%), a large amount of light is reflected or diffusely reflected, making the aluminized PET film It is used as insulation material and light-shielding material.

At the same time, the oxygen permeability of aluminized PET film at normal temperature is less than or equal to 2 Cm3/m2·d·0.1Mpa, and the water vapor permeability is also less than or equal to 2 g/m2.24h, and its ability to block oxygen and gas is excellent. , so it performs well in terms of moisture resistance. The PET film itself has very good heat resistance and can be used for a long time in a temperature range of 120°C. It can even withstand temperatures up to 150°C and a low temperature of -70°C in a short period of time. Under high and low temperature conditions, the mechanical properties of the PET film are affected. The impact is very small, and the aluminized PET film also inherits this characteristic to a certain extent and has good heat resistance.

In view of the excellent gas and light barrier properties of aluminized PET film, as well as good moisture-proof, heat-resistant, puncture-resistant properties, good processing properties and decorative properties, it can be extruded and molded, and can also be dyed with beautiful graphics and printing. Decorative patterns can also be automatically formed, filled, and heat-sealed at high speed, with high production efficiency. Aluminized PET film can replace aluminum foil within a certain range. Now it has been widely used in food packaging, lamination, printing, self-adhesive labels, etc., especially the packaging of dry and light foods such as biscuits and puffed foods. It is also suitable for various high-end tobacco and alcohol packaging, gift boxes and other gold and silver cardboard. , can also be used in milk powder, tea, medicine, and can also be used as laser anti-counterfeiting materials.

Aluminized PET film has a wide range of applications in food flexible packaging. Under qualified processing conditions, it is hygienic and non-toxic. No additives that are harmful to the human body are used during synthesis and processing. Although the aluminum element itself, as a metal material, has a certain degree of toxicity, when it is heated to 1200 degrees or above during the processing of the aluminum coating, the internal atomic structure will change. If the aluminum in the aluminum wire If the content is high and the purity is high, some of the harmful substances to the human body will disappear after ultra-high temperature treatment.

The aluminum-plated film used in food packaging is generally of food-grade quality and needs to meet the testing requirements of food standards. It is non-toxic and can be used with confidence. The opposite of food grade is non-food grade aluminum coating, which is used in the industrial field. With the improvement of usage requirements, the vast majority of aluminum-plated films currently use food-grade aluminum-plated film production technology. As long as the products are inspected and have qualified quality, they are not harmful to human health.

The aluminum coating thickness of aluminized PET film is generally 25~500nm, which can be measured with an optical density meter. If the aluminum coating is uniform, it is measured at 10 points within 120m in the longitudinal direction, and the thickness error is less than 10%. When measured at 18 points in the transverse direction, the error is less than 5 %, the qualification rate of the product is identified through the above values.

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