Metallised films (or metallized films) are polymer films coated with a thin layer of metal, usually aluminium. They offer the glossy metallic appearance of an aluminium foil at a reduced weight and cost. Metallised films are widely used for decorative purposes and food packaging, and also for specialty applications including insulation and electronics.
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Metallisation is performed using a physical vapor deposition process. Aluminium is the most common metal used for deposition, but other metals such as nickel and chromium are also used. The metal is heated and evaporated under vacuum. This condenses on the cold polymer film, which is unwound near the metal vapour source. This coating is much thinner than a metal foil could be made, in the range of 0.5 micrometres.[1] This coating will not fade or discolour over time. While oriented polypropylene and polyethylene terephthalate (PET) are the most common films used for metallisation, nylon, polyethylene and cast polypropylene are also used.[2]
Metallised films have a reflective silvery surface similar to aluminium foil and are highly flammable. The coating also reduces the permeability of the film to light, water and oxygen. The properties of the film remain, such as higher toughness, the ability to be heat sealed, and a lower density at a lower cost than an aluminium foil. This gives metallised films some advantages over aluminium foil and aluminium foil laminates. It was once thought that metallised films would become a replacement for aluminium foil laminates, but current films still cannot match the barrier properties of foil. Some very high barrier metallised films are available using EVOH, but are not yet cost effective against foil laminates.[3]
Comparison of Metallised PET and aluminium foil Moisture (g/m2·day) Oxygen (mL/m2·day) UV light (%transmittance) PET film, 12.7 μm[1] 31 465 91 Metallised PET[1] 0.8 1.2 5 Aluminium foil 6 μm[4] 0 0 0Metallised films were first used for decorative purposes as Christmas tinsel,[1] and continue to be used for items such as wrappers, ribbons, and glitter. Metallic helium-filled novelty balloons given as gifts are made of metallised BoPET and often called Mylar balloons commercially.
Both metallised PET and PP have replaced foil laminates for products such as snack foods, coffee and candy, which do not require the superior barrier of aluminium foil. Metallised nylon and polyethylene are used in the meat export market. The controlled permeation extends shelf life.
Metallised films are used as a susceptor for cooking in microwave ovens.[5] An example is a microwave popcorn bag.
Many food items are also packaged using metallised films for appearance only, as these produce a package with greater sparkle when compared to competing products that use printed paper or polymer films.
Metallised PET films are used in NASA spacesuits to reflect heat radiation, keeping astronauts warm, and in ″proximity suits″ used by firefighters for protection from the high amount of heat released from fuel fires. Aluminized emergency blankets ("space blankets") are also used to conserve a shock victim's body heat. MPET has been used as an antistatic container for other heat and sound insulating materials used in aircraft, to prevent the insulation from leaking into the passenger cabin, but is not itself the insulator in that use. Burning MPET insulation was identified as a cause of the crash of Swissair Flight 111 in that killed 229 people, leading to new recommendations on its use in airliners.
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Metallised films are used as a dielectric in the manufacture of a type of capacitor used in electronic circuits,[6] and as a material in some types of antistatic bags.
Filmquest supplies all grades of PET film, including metalized PET film in slit-to-width rolls, cut sheets, and fabricated components. Filmquest can offer short lead times with competitive pricing.
The metalization of the PET film adds an aesthetic that is appealing for many applications, particularly when used for flexible packaging. It also changes other characteristics of the PET film, making it useful for many applications.
Questar® brand metalized PET is available in a full range of metalized tinting from fully opaque (reflective) to low level tint (transparent). Metalized PET is also offered in an array of metalized / treated or coated side variations including:
Metalized polyester film, also called metalized PET film, met PET film, or aluminized PET film, is a plastic film that has been treated so that a layer of aluminum particles are put on one side of the film. The amount of aluminum applied allows for various levels of tinting. This aluminized PET film has physical, mechanical, optical, thermal, electrical and chemical properties that make it very well suited for many specialized applications.
Metalized PET film from Filmquest has various technical properties that make it a good choice for many applications. View the Questar® CP-133 Metalized Polyester Film 48 Gauge Technical Data Sheet (PDF) for details on the popular 48 gauge film.
Customers choose Filmquest for metalized polyester film/met PET film because of:
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