Heat shrink wrap is unique in the way it is applied to products.
Firstly, plastic shrink film is wrapped around a product before any open ends are sealed to create an air-tight barrier.
Heat is then applied to the film - either via a heat gun or heat tunnel - which shrinks in size and forms perfectly and snugly around the exact shape of its contents.
This process is possible because of the plastic polymers present in the film. In its pre-heated state, the film consists of straight polymers, which break down and move freely when heated - allowing the film to reduce in size. When the film then cools and sets into its new shape, its tensile strength increases, providing a tough and durable protective barrier.
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