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An overwrap can have several purposes or functions:
- Combine two or more smaller packages into a larger multi-pack
- Keep a package or item clean
- Help prevent package pilferage or premature opening of the package
- Help provide a tamper indicating seal
- Help keep insects out of a package
- Obscure a package for distribution, sale, or gifting
- Help provide an authentication seal
- Help provide grease resistance or water resistance
- Keep an item, such as magazines, clean and intact during shipment; provide an address label that does not damage the item
- Provide graphics, advertising, warnings, instructions, bar codes, etc.
Types of overwraps
Shrink wrap is a material made up of polymer plastic film. When heat is applied it shrinks tightly over whatever it is covering. Heat can be applied with a hand held heat gun (electric or gas) or the product and film can pass through a heat tunnel. Most shrink films are polyethylene.
Plastic films, usually polyethylene or polypropylene, can be wrapped around an item and attached with adhesive, PSA tape, or heat seals. Sometimes the film is in the form of a plastic bag which is sealed around the item.
Kraft paper and a variety of other papers can be used to overwrap items in a package or to overwrap a package. Some papers provide abrasion protection for packaged items. Sealing can be by adhesive, tapes, heat seals, etc. Some papers also have grease resistance or are saturated with volatile corrosion inhibitors, etc.
- Soroka, W. Illustrated Glossary of Packaging Terminology (Second ed.). Institute of Packaging Professionals.
- Cooke, Linda (March 1998), "Pest-Proofing Food Packaging", Agricultural Research
- Soroka, W, "Fundamentals of Packaging Technology", IoPP, 2002, ISBN 1-930268-25-4
- Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ISBN 978-0-470-08704-6