PET met is a polyester film metallized with aluminum powder. Polyester film (short: PET film) is already characterized by high strength and surface hardness. Especially with regard to the diffusion density however, the favorable properties can be improved through the use of aluminum powder.
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A PET film metallized with aluminum powder has advantages and disadvantages compared to conventional aluminum foils. The advantages of PET met are in particular, a higher tensile strength and lower production costs. The possible processing speed is significantly higher than that of aluminum foil in the composite material produced by vaporizing aluminum.
This makes PET met, the metallized polyester film particularly useful for applications such as:
High, but not absolute diffusion density
With PET met, a composite material made of a wafer-thin aluminum layer and a PET film, diffusion values of less than 0.5 cm³/m²/d for oxygen and less than 0.3 g/m²/d for water vapor even at material thicknesses of 10 μm can be achieved. These values are already close to the measurement limits which are indicated for the identification of the absolute diffusion density.
For an absolute diffusion density, however, a classic aluminum foil or a different metal foil has to be used.
PET met combines the positive properties of aluminum and PET film.
In contrast to a laminated composite material, the aluminum coating in PET met only causes a change in the diffusion, optical and electrical properties. The favorable strength values and the low specific weight of the PET film however, remains practically unchanged.
The thickness of the aluminum layer in PET met is so small that the unit, Ångström, which is derived from the atomic diameter is usually used instead of a measurement in μm (micrometers).
A measurement in Ångström can therefore be regarded as a corresponding number of atoms stacked directly above one another. This of course, does not reflect the actual physical conditions, but illustrates the extremely small thickness of the metal support layer.
The typical range of aluminum layer thicknesses for a metallized PET film of about 30 Å – 500 Å is about 3 to 50 nm. For comparison, pure gold can be reshaped into Å of thin gold leaf. At this thickness, gold is already slightly translucent and appears green against the light.
PET met foil is always slightly transparent.
Even metallized PET film is not completely opaque. In the case of incident light, this effect cannot be seen due to the silvery reflecting surface. This effect can be varied by printing, dyeing or varnishing as well as by brushing or embossing the PET film.
The highly reflective surface of a metallized PET film can be used to create an attractive optical effect in packaging as well as a barrier against electromagnetic radiation.
Aluminum vapor-coated PET foil reflects not only visible and infrared light, but also UV radiation. The aluminum coating differs from the silver or gold coatings used for similar purposes. Compared to these metals, the degree of reflection of aluminum is largely independent of the wavelength. The minimum which is still above 85%, is slightly above 800 nm in the near infrared range.
The reflection factor and the optical density of metallized PET film increases proportionally with the thickness of the aluminum coating. The optical density (OD) measured as the logarithm of the incident optical radiation divided by the radiation energy transmitted is typically between 0.25 and 3.5 for PET met.
The thicker the aluminum layer, the higher the optical density and the lower the transparency.
The degree of reflection is thus about 66-99% because, due to the logarithmic scaling, an optical density of 0.3 corresponds to half of the transmitted radiation intensity.
Just as it is the case with solid pure aluminum, a superficial oxidation takes place in the aluminum coated PET film. It protects the metal from further chemical conversion, both on the side exposed to air as well as the substrate side.
This self-passivation resulting from the formation of transparent aluminum oxide leads to a reduction in the optical density and the electrical conductivity, especially in the first 24 hours after the production of the metallized PET film. It must therefore be taken into account during production if customer specifications are to be observed with regard to these values.
PET met films become more transparent over time.
Since the oxide layer grows to a maximum of 3 to 4 nm irrespective of the thickness of the aluminum coating, the effect is particularly strong with thin coatings. With an approximately 10 nm thick aluminum coating, the optical density can drop from 0.2 to 0.28 within 24 hours and to about half of the original value in the long term.
Metallized PET film is suitable, for example, in packaging technology as a direct replacement for aluminum foil. For the same film thickness, PET met is characterized by a higher tensile strength and flexural rigidity such that the composite material produced by vaporization of the metal is not as wrinkled as aluminum foil.
PETmet als Ersatz für Alu mit Vor- und Nachteilen.
This can give the package a more presentable look. Despite this, individual packages for candies, which are closed by twisting the film ends (twist closure) are also possible with metallized PET film.
However, aluminum foil also has advantages in certain packaging because, unlike PET met film, it is opaque and guarantees an absolute diffusion density. In general, food packaged with PET met film is therefore not as durable as those packaged with aluminum foil. PET met film is therefore more suitable for foodstuffs with short shelf life, which only stay in the supermarket for a relatively short time before a buyer gets it.
Further application possibilities for metallized PET film in the field of food packaging result from the fact that the extremely fine metal coating changes the electrical conductivity at the surface of the film. This makes PET met visible in metal detectors, but can also be used, for example in the packaging of microwave dishes with low water content, so that the food can absorb more energy and heat up quickly.
In the case of building insulation, the positive influence of the aluminum vaporization on the diffusion resistance as well as on the reflection of thermal radiation is important. Compared with aluminum foil, PET met offers no absolute vapor barrier, but a significantly higher mechanical resistance and a better reflectivity.
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Metallised PET film exhibits robust mechanical properties, making it a reliable material for various applications. It offers good tensile strength, tear resistance, and dimensional stability. These properties make it suitable for applications that require strength and durability. The film is capable of withstanding external forces without easily tearing or deforming.
This makes it an ideal choice for packaging, where it can protect the contents inside. Additionally, the film's dimensional stability ensures that it maintains its shape and size even under different environmental conditions.
Metallised PET film offers excellent barrier properties against moisture, gases, and odours, making it an ideal choice for various packaging applications. The metal layer in the film acts as a barrier, preventing the transmission of these substances through the film.
This is particularly important in packaging where protection against moisture and oxygen is crucial. metallised PET film provides a reliable and effective solution for maintaining the freshness and quality of packaged products. It ensures that moisture and gases cannot penetrate the film, keeping the contents safe and preserving their shelf life.
The barrier properties of metallised PET film also help prevent odours from escaping or entering the packaging, ensuring that the product remains odour-free.
You will find that metallised PET film offers impressive thermal properties. This versatile material has good thermal stability, allowing it to withstand high temperatures without deformation. Additionally, it has low thermal conductivity, making it suitable for applications that require insulation properties.
Met PET film can be laminated with other materials to further enhance its thermal properties. These thermal characteristics make metallised PET film ideal for various industries. It can be used in packaging applications to provide efficient thermal insulation to products.
With its ability to regulate heat and light transmission, metallised PET film is also used in solar control applications.
When comparing metallised PET film and aluminium foil, you'll find differences in gas tightness, tear resistance, flexibility, weight, corrosion sensitivity, and wrinkle-proneness. metallised PET film is less gas-tight than aluminium foil, but it offers better tear resistance, and flexibility, and is lighter in weight.
It is also less prone to corrosion and wrinkles compared to pure aluminium foil. While aluminium foil provides a higher level of gas-tightness, metallised PET film compensates for its other properties. The tear resistance of metallised PET film makes it more durable, and its flexibility allows for easier handling and wrapping. Additionally, the lighter weight of metallised PET film can be advantageous in certain applications.
So, when choosing between the two, consider the specific requirements of your project to determine which material is the best fit.
Now let's explore the applications and uses of metallised PET film. In the packaging industry, metallised PET film is widely used for flexible packaging, labels, and pouches due to its attractive appearance and excellent barrier properties.
Whereas, in the electronics industry, it finds applications in flexible printed circuits, electromagnetic shielding, and insulation, thanks to its reflectivity and low transmittance properties.
Utilising its reflective surface and excellent barrier properties, metallised PET film finds extensive application in the packaging industry for flexible packaging, labels, and pouches. The reflective surface of the film adds an attractive and premium appearance to the packaging, making it eye-catching to consumers. Additionally, the metallised PET film provides excellent barrier properties, protecting the contents from moisture, gases, and UV radiation.
This ensures that the packaged products remain fresh and protected throughout their shelf life. The film's ability to block out UV radiation also helps in preserving the quality and colour of the packaged products. Furthermore, the film's flexibility allows for easy customisation and shaping, making it suitable for various packaging formats.
Metallised PET film is extensively utilised in the electronics industry for various applications and uses. Its high reflectivity and low transmittance properties make it suitable for flexible printed circuits, electromagnetic shielding, and insulation. In flexible printed circuits, the film provides a flexible and lightweight substrate for electronic components. It also offers excellent insulation properties, protecting the circuit from external factors.
Additionally, metallised PET film is used for electromagnetic shielding, preventing interference and maintaining signal integrity. Its reflective properties make it ideal for reflective insulation and light control in electronic devices. The film's strength, flexibility, and thermal stability contribute to efficient performance and protection for electronic components. With its unique properties, metallised PET film continues to find new applications in the electronics industry, driving innovation and sustainability
One reason metallised PET film is commonly used in packaging is that it offers excellent barrier properties. The metal layer on the film's surface provides a strong barrier against moisture, gases, and odours, ensuring that the contents of the packaging remain fresh and protected.
Additionally, metallised PET film is lightweight and flexible, making it easy to handle and package various products. Its tear resistance and dimensional stability further contribute to its suitability for packaging applications. Moreover, the film's high reflectivity and low transmittance properties enhance the visual appeal of the packaging, making it eye-catching and attractive to consumers.
Metallised PET film is also a cost-effective and more environmentally friendly alternative to traditional packaging materials, making it a popular choice for manufacturers in the industry.
When selecting metallised PET film for packaging, you should consider several factors to ensure that it meets the specific requirements and provides the desired level of barrier protection for your product.
First, consider the sensitivity of your product to light, oxygen, and moisture. Determine if it requires a high-barrier film to protect it effectively. Next, consider the type of packaging equipment you will be using. Make sure the film is compatible with your equipment and can be processed efficiently.
Additionally, think about the desired level of barrier protection. Different films offer varying levels of protection, so choose one that suits your product's needs. Lastly, consider the storage and handling requirements of the film to maintain its quality and effectiveness. By considering these factors, you can select the right metallised PET film for your packaging needs.
To ensure the sustainability of metallised PET film, it is crucial to address its environmental impact and implement effective recycling practices. While metallised PET film can be recycled, the process is more complex due to the presence of the metal coating.
Proper recycling infrastructure and procedures are required to separate the metal layer from the film for efficient recycling. Without proper recycling practices, metallised PET film can contribute to waste and pollution.
However, when recycled correctly, metallised PET film is considered a sustainable option compared to other film materials.
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