The terms active packaging, intelligent packaging, and smart packaging refer
to packaging systems used with foods, pharmaceuticals, and
several other types of products. They help extend shelf life, monitor freshness,
display information on quality, improve safety, and improve convenience.
The terms are closely related. Active packaging usually means having active functions
beyond the inert passive containment and protection of the product. Intelligent and smart packaging usually involve the ability
to sense or measure an attribute of the product, the inner atmosphere of the
package, or the shipping environment. This information can be communicated to
users or can trigger active packaging functions.
Depending on the working definitions,
some traditional types of packaging might be considered as "active"
or "intelligent". More often, the terms are used with new
technologically advanced systems.
For many years,
desiccants have been used to actively control the water vapor in a closed
package. A desiccant is a hygroscopic substance usually in a porous pouch or sachet which is placed inside a sealed package. They have
been used to reduce corrosion of machinery and electronics and to extend the shelf life of
moisture sensitive foods and drugs.
Corrosion inhibitors can be applied to items to help
prevent rust and corrosion. Volatile corrosion inhibitors (VCI) or vapor phase
corrosion inhibitors can be provided inside a package in a pouch or can be
incorporated in a saturated over wrap of special paper. Many of these are
organic salts that condense on the metal to resist corrosion. Some films also
have VCI emitting capability.
Films are available with copper ions
in the polymer structure; these neutralize the corrosive gas in a package and
deter rust.
VCI create a neutral environment in
the packaging. It works on the principle of difference in vapour pressure and
causes reaction with Metals and Non metals and also with Moisture to render it
active to corrosion. There are different forms of VCI's available like Papers, Plastics,
HDPE Papers, Oils, Foams, Bubble, and Emitters etc. that can prevent corrosion
at many stages.