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Shrink wrap or shrink film, is a material made up of polymer plastic film.
When heat is applied to this material it shrinks tightly over whatever it was covering.
It is commonly used as an overwrap on many types of packaging: CDs, DVDs, cartons, books, beverage cans, large appliances, pallet loads or even food etc.
In addition, it is also used to cover boats after manufacture and for winter storage. Shrink bands are applied over parts of packages for tamper resistance or labels. It can also combine two packages or parts.
The most commonly used shrink wrap is polyolefin. It is available in a variety of thicknesses, clarities, strengths and shrink ratios. The two primary films are either crosslinked, or non crosslinked. Other shrink films include PVC and several other compositions.
A shrink film can be made to shrink in one direction (unidirectional or mono-directional) or in both directions (bidirectional).
Current trends are to improve film properties which may lead to reduced caliper (source reduction) and to improve process efficiency (cost and energy savings).
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