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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.
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.
3-50nm
is the typical thickness of the aluminum coating
Metallized PET film has a typical aluminum coating thickness of 3 to 50 nm, providing excellent barrier properties with minimal material usage.
Effect of film thickness on the reflection factor of PET metThe 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.
For more information, please visit pet aluminum sticker.
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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Custom stickers are a popular choice for creating eye-catching and effective promotional materials, but choosing the right printable stickers to meet your specific needs is critical. Two of the most popular printable sticker paper options are PET and vinyl sticker paper. Do you know the difference between them?
Pet sticker paper are made from polyethylene, which is cheaper and more environmentally friendly, compared to vinyl sticker paper, which are more durable and have stronger adhesion.
In this article, we&#;ll provide an overview of PET and vinyl stickers, discuss the pros and cons of each, and provide guidance on how to choose the best option for your business.
PET sticker paper is a popular option for businesses that prioritize sustainability and aesthetics. PET is a synthetic polymer used in various products, including sticker paper. PET sticker paper is composed of a thin layer of PET film coated with adhesive and a release liner.
One of the significant advantages of using PET sticker paper is its eco-friendliness. PET is a recyclable material, and the sticker paper made from it can be recycled, making it a sustainable option for businesses that want to reduce their environmental footprint. PET sticker paper is an excellent alternative to other synthetic sticker paper options that are not recyclable and contribute to environmental pollution.
PET sticker paper has a glossy finish that makes colors pop and gives stickers a premium look and feel. The glossy finish is also resistant to smudging, making the sticker paper a perfect option for branding and marketing purposes. Additionally, PET sticker paper has a smooth surface that allows for high-resolution printing, ensuring that the stickers come out looking crisp and professional.
In general, PET sticker paper is cheaper than Vinyl sticker paper.
PET sticker paper is not as durable as other sticker paper options, and it can easily tear or fade when exposed to harsh environments or handling such as extreme temperatures, exposure to water or chemicals, or constant exposure to sunlight.. Therefore, it may not be the best option for outdoor use or applications that require high durability.
What&#;s more, PET sticker paper also has a good adhesive, but it may not be as strong as vinyl sticker paper. PET sticker paper does not have as wide a range of applications as vinyl sticker paper.PET sticker paper, on the other hand, may not stick well to some textured surfaces.
In summary, PET sticker paper is an eco-friendly and aesthetically appealing option for businesses that prioritize sustainability and high-quality printing. However, the limited durability may makes it less practical for some applications.
Vinyl sticker paper is a type of printable sticker paper made of polyvinyl chloride. Vinyl sticker paper is composed of a layer of vinyl film coated with adhesive and a release liner. Vinyl sticker paper is known for its durability and strong adhesive, making it an excellent option for businesses that require long-lasting stickers.Vinyl sticker paper is a type of sticker paper that offers several advantages and disadvantages.
One of the significant advantages of using vinyl sticker paper is its durability. Vinyl sticker paper is highly resistant to environmental factors, such as humidity, heat, and cold temperatures, making it an ideal option for outdoor applications. It is also highly resistant to abrasion, tearing, and fading, which ensures that the stickers remain in good condition even after prolonged use.
Another advantage of vinyl sticker paper is its strong adhesive. Vinyl sticker paper has a strong adhesive that allows the stickers to stick firmly to a variety of surfaces. This adhesive strength makes vinyl sticker paper a popular option for businesses that require long-lasting stickers.
Vinyl sticker paper is also highly versatile. It can be used on a variety of surfaces, including glass, plastic, metal, and wood. This versatility makes vinyl sticker paper an excellent option for businesses in various industries.
However, there are also some disadvantages of using vinyl sticker paper. One of the significant disadvantages is the higher cost. Vinyl sticker paper is more expensive than other sticker paper options, such as paper or synthetic film. This higher cost may make it less accessible to businesses with limited budgets.
Another disadvantage of vinyl sticker paper is its limited eco-friendliness. Vinyl sticker paper is not recyclable, making it less sustainable than other sticker paper options. This means that it can contribute to environmental pollution, making it a less environmentally friendly option for businesses that prioritize sustainability.
In conclusion, vinyl sticker paper offers several advantages, including durability, strong adhesive, and versatility, making it a popular option for businesses that require long-lasting stickers. However, the higher cost and limited eco-friendliness may make it less accessible to some businesses.
When choosing between PET and vinyl sticker paper, businesses need to consider a range of factors to ensure that they select the right type of paper that meets their specific needs.
One of the critical factors to consider is durability. If the stickers will be exposed to harsh environments or handling, vinyl sticker paper is a better option due to its high durability. On the other hand, PET sticker paper is less durable than vinyl but is still a good option for indoor applications.
Eco-friendliness is another factor that businesses need to consider when choosing between PET and vinyl sticker paper. If your business prioritizes sustainability, PET sticker paper is a better option as it is made of recyclable material. PET sticker paper is also known for its biodegradability, which makes it an environmentally friendly option.
Cost is another crucial factor to consider. If you have a limited budget, PET sticker paper is a more affordable option compared to vinyl sticker paper. This is because PET is a cheaper material to produce, which translates into lower sticker paper costs.
Print quality is also an essential factor to consider. If you want high-resolution prints, PET sticker paper is a better option as it has a smooth surface that allows for clear and crisp printing. Vinyl sticker paper, on the other hand, has a rough surface that can impact the print quality.
Application is another important factor to consider. If you need to apply stickers to various surfaces, vinyl sticker paper is a better option due to its versatility. Vinyl sticker paper can stick to almost any surface, including textured surfaces. PET sticker paper, on the other hand, may not stick well to some textured surfaces.
Ink compatibility is also critical. It is important to ensure that the sticker paper is compatible with the ink used for printing. Vinyl sticker paper is compatible with a wide range of inks, including solvent, eco-solvent, and UV-curable inks. PET sticker paper is compatible with aqueous inks, which are water-based inks commonly used in inkjet printers.
Adhesive strength is another important factor to consider. If you need stickers that will stick firmly to surfaces, vinyl sticker paper is a better option as it has a strong adhesive. PET sticker paper also has a good adhesive, but it may not be as strong as vinyl sticker paper.
Lastly, businesses also need to consider the method of application when choosing between PET and vinyl sticker paper. Vinyl sticker paper requires a transfer tape to apply the stickers to surfaces, while PET sticker paper does not. This factor is crucial as it can impact the ease of application, the time required to apply the stickers, and the cost of the application process.
In conclusion, both PET and vinyl sticker paper have their advantages and disadvantages. It&#;s essential to consider factors such as durability, eco-friendliness, cost, print quality, application, ink compatibility, and adhesive strength when choosing the right printable sticker paper for your business.
PET sticker paper offers excellent print quality and eco-friendliness. Vinyl sticker paper, on the other hand, is durable and compatible with various inks.
Ultimately, the choice between PET and vinyl sticker paper depends on your specific needs and preferences. Consider your priorities and requirements to determine which option is best for you. With the right printable sticker paper, you can create high-quality stickers that promote your brand and enhance appearance of product.
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