MPET film stands for Metalized Polyester Film, which is a type of polyester film that has been coated with a thin layer of metal, usually aluminum. The metal coating is applied to one side of the polyester film using a process called vacuum deposition. During this process, the film is placed in a vacuum chamber, and a high voltage current is passed through a tungsten filament to heat it up. This causes the metal, in the form of wire or vapor, to evaporate and then condense onto the film surface, creating a thin layer of metal coating.

MPET film is known for its reflective and barrier properties, making it ideal for various applications. The metal coating on the film provides high reflectivity, which makes it useful in packaging applications for products that need to be protected from light and heat. The film also has excellent moisture and gas barrier properties, making it suitable for use in food packaging and other applications where products need to be protected from moisture, oxygen, and other gases.

MPET film is commonly used in a variety of industries, including food and beverage packaging, pharmaceutical packaging, insulation, and decorative applications. Its reflective properties also make it suitable for use in reflective insulation materials, such as radiant barriers used in building insulation.Besides,The working principle of MPET film is based on its reflective and barrier properties, which are achieved through the application of a thin layer of metal, typically aluminum, onto a polyester film substrate. This process is known as vacuum deposition.

During vacuum deposition, the MPET film is placed in a vacuum chamber, and a high-voltage current is passed through a tungsten filament, heating it up to a high temperature. This causes the aluminum wire to evaporate, and the aluminum vapor then condenses onto the surface of the polyester film substrate, creating a thin layer of metal coating.The metal coating on the MPET film provides a highly reflective surface, which reflects light and heat away from the surface of the film. This makes MPET film an effective barrier against heat and light, and it is commonly used in packaging applications to protect products from these elements.In addition, the metal coating on the MPET film also provides a barrier against moisture and gases. This makes MPET film an effective barrier against oxygen and other gases that can degrade the quality and shelf life of products.

Overall, the working principle of MPET film is based on its reflective and barrier properties, which are achieved through the application of a thin layer of metal onto a polyester film substrate.