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Metallized boPET film, 32 layers of ~14 μm thickness each. BoPET (biaxially oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, [1] chemical stability, [1] dimensional stability, [2] transparency [1] reflectivity, and electrical insulation. [1]
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.
"Biaxially oriented PET film (BOPET) is manufactured with a film of the molten polymer being extruded onto a chill roll, which quenches it into the amorphous state. Biaxial orientation, then, occurs through a drawing process which can be either simultaneous or sequential. The most common way of producing BOPET is the sequential process.
E. I. DuPont de Nemours in Delaware, United States, first produced Dacron (PET fiber) in 1950 and used the trademark Mylar (boPET film) in June 1951 and received registration of it in 1952. [27] [28] It is still the best-known name used for polyester film. The current owner of the trademark is DuPont Teijin Films.
This process involves heating the metal until it vaporizes then depositing it at a high pressure onto the polyester film . [4] This process produces thinner, more flexible, more durable, and more comfortable fibers. [9] Metal fiber may also be shaved from wire (steel wool), shaven from foil, or bundle drawn to form larger diameter wire. [3]
Recycling it would only help further the emission reduction. The recycled material can be put back into bottles, fibres, film, thermoformed packaging and strapping. [4] After collecting the bottles from landfills, they are sorted, cleaned and grinded. This grinded material is 'bottle flake,' which is then processed by either:
In 1835, Justus von Liebig discovered the process of coating a glass surface with metallic silver, making the glass mirror one of the earliest items being metallized. Plating other non-metallic objects grew rapidly with introduction of ABS plastic.
In physical chemistry and engineering, passivation is coating a material so that it becomes "passive", that is, less readily affected or corroded by the environment. . Passivation involves creation of an outer layer of shield material that is applied as a microcoating, created by chemical reaction with the base material, or allowed to build by spontaneous oxidation