How to optimize the barrier properties of PET aluminum coated film using surface modification technology

With the rapid development of the global packaging industry, the demand for high barrier performance materials is increasing day by day.Polyester (PET) aluminum plated filmAs a widely used packaging material, it is favored by the market due to its excellent mechanical strength, transparency, and aesthetics. However, in some specific application scenarios, such as food preservation and drug protection, higher requirements have been put forward for the barrier performance of packaging materials. In order to meet these needs, surface modification technology has become one of the key means to improve the barrier performance of PET aluminum coated film. This article will provide a detailed introduction to several major surface modification methods and explore the technological breakthroughs achieved by Advanced Institute (Shenzhen) Technology Co., Ltd. in this area.

The significance and challenges of surface modification

Although PET aluminum coated film has good physical and chemical properties, its naturally occurring small pores and potential oxidation issues in the aluminum coating limit its application as an ideal barrier material. Especially in environments with high humidity, the aluminum layer is prone to corrosion, leading to an increase in gas or moisture permeability, which in turn affects the quality of the packaging contents. Therefore, how to make up for these shortcomings through effective surface treatment has become a focus of researchers' attention.

Plasma treatment

Plasma treatment is a clean and efficient surface modification method that can generate plasma at low temperatures by introducing active gas molecules to bombard the surface of PET. This method can effectively activate the PET surface, promote the adhesion of subsequent coatings, reduce interface defects, and improve the adhesion between the aluminum plating layer and the PET substrate. In addition, plasma treatment can improve the wettability and adhesion of PET surfaces, which is beneficial for subsequent coating processes.

Chemical plating

Chemical plating refers to the deposition of a uniform and dense functional coating on the surface of PET through chemical reactions without the use of an external power source. Common chemical plating materials include silicon dioxide (SiO ₂), aluminum oxide (Al ₂ O3), and other inorganic nanoparticles. These coatings can not only fill the microporous structure on the surface of PET, but also form a composite barrier effect with the aluminum plating layer, further reducing gas permeability. For example, using fluorinated polymers for chemical plating can create a hydrophobic layer on the surface of PET, effectively preventing moisture from entering and extending the shelf life of packaging contents.

Multi layer composite structure design

Multilayer composite structure is a new and efficient barrier material preparation technology developed in recent years. By alternately stacking two or more thin film materials with different properties, a microstructure with gradient changes can be constructed, which can significantly enhance the overall barrier performance of the material without affecting transparency. regardingPET aluminum plated filmFor example, several layers of barrier layers with different thicknesses and compositions can be sequentially coated on its surface, such as organic-inorganic hybrid materials, polymer nanofibers, etc., to achieve the optimal comprehensive protective effect. This multi-layer composite structure not only improves the barrier performance of the material, but also enhances its UV resistance and chemical corrosion resistance.

Technological Innovation of Advanced Institute (Shenzhen) Technology Co., Ltd

Advanced Institute (Shenzhen) Technology Co., LtdCommitted to the research and development of new materials and technological transformation, significant achievements have been made in the field of surface modification of PET aluminum plated film. The company team has successfully developed a series of high-performance PET aluminum coated film products based on the aforementioned surface modification strategies. They first used plasma treatment technology to pre treat the PET substrate, increasing the number of surface active sites and providing better basic conditions for subsequent aluminum plating. Subsequently, a double-layer functional coating composed of SiO ₂ and Al ₂ O3 was formed on the surface of PET through chemical plating process, greatly reducing the permeability of oxygen and water vapor. The experimental results show that the modified PET aluminum plated film reduces oxygen permeability by about 50% and moisture permeability by nearly 70% compared to traditional products.

In addition to traditional single-layer or double-layer plating, Advanced Institute (Shenzhen) Technology Co., Ltd. has also explored more complex multi-layer composite structure designs. The special PET aluminum plated film they launched adopts a composite structure of five or more layers, including one layer of anti ultraviolet absorber and two layers of different nanofiber materials. This design not only endows PET aluminum plated film with excellent barrier properties, but also endows it with excellent optical properties and environmental adaptability. In addition, to ensure the long-term stability and reliability of the product, the company strictly controls the quality of each process in the production process, ensuring that every roll of PET aluminum plated film meets high standards.

In short, throughPET aluminum plated filmScientific and rational surface modification treatment can significantly improve its barrier performance and meet more stringent application requirements. In the future, with the continuous advancement and improvement of related technologies, we believe that more innovative achievements will emerge, promoting the sustainable and healthy development of the entire industry towards green and environmental protection. Advanced Institute (Shenzhen) Technology Co., Ltd. will continue to adhere to the concept of innovation driven development and provide better products and services to our customers.

The above data is for reference only, and specific performance may vary due to production processes and product specifications.