Shrink wrap, also known as shrink film, is the material that is manufactured from polymer plastic film.
This allows the product to shrink tightly over the product it is covering when heat is applied.
Polyolefin is the most used shrink wrap material as it comes in an array of clarity, shrink ratio, strength and thickness. Polypropylene, Polyethylene, PVC and more compositions are other forms of shrink films.
Shrink wraps are able to be manufactured to shrink in either one direction, mono-directional or unidirectional, or in two directions, bidirectional.
In order for films to stretch, the molecules are oriented away from their initial random pattern when they have been warmed. When it is cooled, the film’s characteristics are set into that position until they are reheated which will cause it to shrink back toward its initial dimensions.
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