Lamination adhesives for PET aluminum coated film is a relatively complex technology, which mainly includes the following steps:
1. Preparation stage
First, select high-quality PET film as the base material. PET film should have good transparency, mechanical strength and flatness to ensure the effect after aluminum plating. At the same time, check and debug the aluminum plating equipment to ensure that the equipment is in good operating condition. Prepare high-purity aluminum wire as the aluminum plating material. The purity of the aluminum wire directly affects the quality of the aluminum plating film.
2. Cleaning treatment
Before aluminum plating, the PET film must be thoroughly cleaned. This is because impurities such as dust and oil on the surface of the film will seriously affect the quality and adhesion of aluminum plating. Advanced cleaning technologies such as ultrasonic cleaning and plasma cleaning are usually used to remove various impurities on the surface of the film to achieve a highly clean state. The PET film after cleaning provides a good foundation for the aluminum plating process.
3. Vacuum aluminum plating
The cleaned PET film is sent into the vacuum chamber of the vacuum coating machine. The vacuum coating machine reduces the pressure in the vacuum chamber to an extremely low level, generally below 10⁻³Pa, through mechanical pumps, diffusion pumps and other equipment. In a high vacuum environment, the evaporation source is heated to evaporate the aluminum wire at high temperature to form aluminum vapor. The aluminum vapor diffuses to the surface of the PET film in a vacuum environment and deposits on the surface of the film to form a uniform aluminum layer. In this process, it is necessary to accurately control the temperature of the evaporation source, the evaporation rate, the vacuum degree, and the transmission speed of the film to ensure that the thickness of the aluminum coating is uniform and the adhesion is strong.
4. Post-processing stage
After the aluminum coating is completed, the PET aluminum coating film is cooled and solidified. Cooling can be done by natural cooling or forced cooling, so that the aluminum coating layer is solidified in a shorter time and closely combined with the PET film. Subsequently, the aluminum coating film is quality tested, including the thickness, uniformity, glossiness, adhesion and other indicators of the aluminum coating layer. If quality problems are found, they should be adjusted and processed in time. Finally, the qualified PET aluminum coating film is packaged and stored to prevent it from being contaminated and damaged.
In short, the process of Lamination adhesives for PET aluminum coated film requires strict control of parameters in each link to ensure the quality and performance of the product. With the continuous advancement of science and technology, the aluminum coating process is also constantly innovating and improving, which provides a new opportunity for the widespread use of PET aluminum coated film.
