What Is Metallised PET Film And What's It Used For? - Pouches.co.uk

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.

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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.

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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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Hi,

Metalized polyester film caps are much more readily available than film foil polyester caps (at least at my accessible suplliers) but they do have different construction types as can be checked at these links:
http://www.wima.com/EN/filmfoil.htm
http://www.wima.com/EN/metallized.htm

More than care about the technical advantages and disadvantages of each techonology, is there any influence in the tone between this two (as there is between film caps and electrolytics and ceramics)?
The question becomes relevant in trying to recreate (clone) some vintage effect pedals, like a Ram's Head BMP, that I believe uses the foil type ones (at least it's marked like that on the scheme).

Thanks,

João I don't usually say this, but do a search.  This is easily one of the hottest topics in the audio world and has been hashed out many, many, many times.  I'll shorten it for you though: no one can agree so you'll have to do your own listening tests and judge for yourself.  Capacitors are another source of myth in audio. I think most of what you'll find in audio circles will be anecdotal at best, and pure BS and hype at worst.

These may be the best questions to start with - why do manufacturers make capacitors out of different materials, or use different construction styles? What makes one 0.1uf, 250V capacitor different from another 0.1uf, 250V capacitor (micro Farads are micro Farads arent' they)?

If you find anything interesting on the subject, post a link.  


*** Actually, that site has some interesting info on caps. Click on the "Technical Info" button.

Quote from: Electron Tornado on December 17, , 10:35:53 AM
These may be the best questions to start with - why do manufacturers make capacitors out of different materials, or use different construction styles? What makes one 0.1uf, 250V capacitor different from another 0.1uf, 250V capacitor (micro Farads are micro Farads arent' they)?

The difference between metallized and film-and-foil is pretty simple. The metal is much thicker on the film and foil, much thinner on the metallized.

This does the following:
- the metalized caps are smaller (thinner layers)
- the metalized caps are self healing - punch throughs burn off the metal at the hole and "cure" the short
- the foil caps have a much lower spreading resistance than metalized, which makes them better suited to high current and pulse applications.

I can concoct situations where you could hear a difference between the two (I think... you have to use high audio currents) but in low signal applications, I strongly doubt that even "golden ears" listeners could do better than random chance guessing between the two in a fair test. I'm just rambling, but in my opinion if you pick two same value caps made of different materials that are both stable within the conditions they are being used....you probably won't hear a difference and if you do it is most likely expectation bias.




Thank you guys. From the additional search I did, I've found nothing more conclusive than:

"You can't tell the difference in low signal aplications"

And by the way, there's no "golden years" around here, just regular human tissue ones. And they work fine. I'll relax and enjoy the build first and the fuzz afterwards... What I keep reminding people of is that any capacitor type will likely have some sort of property that makes it ideal for a certain context, but not necessarily "better" in any context.  the question to ask is whether film vs foil vs tantalum vs whatever makes a difference in our context (which is not the same as, say, studio quality music reproduction) and in the specific context one is interested in. In my little world the biggest difference in those good quality caps, excluding ceramics for now, is avialability.  Panasonic and AVX were my goto brands. Now they are drying up. Wima is a little pricy and Epcos seems to be having production problems.  I built a project recently that looks like a Christmas tree with all the different colored box caps. 

Quote from: ddpawel on December 17, , 07:17:23 PM
Don't listen to guys saying "there is no difference".
Bulls*** and other s*its together.
There's a major differences in impedancy, capacitance is changing different with temperature and frequency, noise level & ...

Maybe this can help:

http://www.elportal.pl/pdf/k01/06_07.pdf

This pdf is in polish language, but you can read some properties from figures.

Don't take this the wrong way, but unless someone is fluent enough in Polish, that article isn't useful. It's easy enough to see what they are saying, but it would be much better to be able to know what the author is saying.  I can see that some of the graphs cover the audio frequency range, or part of it, but there's still nothing to show whether that has any audible effect on how they will perform in a stompbox.

Can you translate the article? Knowing how the ear works, hearing is a very complex, dynamic system, but we're just not tuned to notice these kinds of differences.

I've swapped in half-cent cheapo ceramics for mylars for WIMAs and haven't noticed any change whatsoever. Mind you it wasn't a blind test, but if its obvious enough to NOTICE in the same circuit, it exists IMO. I've seen some sites with graphs and oscilloscope readings and other VISUAL representations, but the only variable that matters is how the ear picks it up.

The way I see it, you'll hear more "tone" blowing your nose than you would changing cap types

Quote from: Electron Tornado on December 18, , 01:48:51 AM
It's easy enough to see what they are saying, but it would be much better to be able to know what the author is saying. 

Sorry, that should read, "It's easy enough to see what some of the graphs are saying......"
Self's new book has a wonderfully concise chapter on component distortion. See page 53 onwards for plastic caps:
http://books.google.co.uk/books?id=PvKPEFu2PVkC&lpg=PP1&dq=small%20signal%20audio&pg=PA53#v=onepage&q&f=false

In short, although they do produce measurable distortion, it is far too small to be audible even at 20Vrms signal levels. At the <3Vrms levels we use in pedals, it probably wouldn't even be measurable.
Compared with the distortion that your amp / other effects will inevitable add, plus unavoidable noise, it is a non issue. You won't hear the difference between plastic caps (unless it's because they have different capacitances!  ) When I've started this thread, I was more interested in understanding if and why there was any difference in tone between this two types of cap than which one is best. The question becomes relevant when one is trying to recreate (clone) some vintage effect pedals. All the guys that tried to answer that question pointed out that the differences are very, very small for the signal levels we usually have on guitar effects.
Metallized capacitors have a slightly better performance because the aluminum foil used has a lower resistance (lower dielectric loss) than thinner sputtered metallization on the dielectric. In addition, depending on the type and the metallization (or not) capacitors have a different capacity depending on the frequency, voltage, etc. Sometimes these differences are even a few percent!

So when you are at least several capacitors of the same type of difference will be slightly audible, but it will be. In some effects changes are even quite good hear.