In composite packaging, aluminized PET film and aluminized CPP film are mostly used. Aluminized PET film is generally used for
the middle layer, because aluminized PET has no heat sealability and cannot be well sealed and packaged, and aluminized CPP can
be used as an inner layer for composite packaging. This is the aluminized film.
Aluminized film is essentially a plastic film. It is a thin aluminum layer cooked on the plastic film. The plastic substrate
can be PET film, OPP film, CPP film, PVC film, and nylon film.
Aluminum foil is essentially a metal. It is a thin sheet formed by rolling an aluminum profile thin enough. This sheet can be
used to package products in flexible packaging. Of course, aluminum foil is also not heat-sealable, it needs to be compounded
with other materials, such as PE, CPP, or coated. The metal foil used in flexible packaging is generally 7um thick. Of course,
it involves pharmaceutical packaging. There are 15um, 20um, 22um and 40um. The barrier property of aluminum coating is far
better than aluminum foil, because the thickness of aluminum layer is not as thick as aluminum foil. Of course, the thickness
of the aluminum foil is different, and the use is also different. Therefore, the packaging cost of electroplated film is much
lower than that of aluminum foil packaging