Shrink wrap also referred to as shrink film or shrink wrap is a versatile polymer material used for the packaging of finished goods. Heat is applied to the film by either a conveyor heat tunnel or an electric orgas heat gun which catalyzes the film to shrink tightly around the item placed within. This process results in a clear durable barrier of protection around the product So how exactly does this happen The science of shrink wrap can be explained in terms of molecular behavior. The molecules of a shrink film sheet or tube are randomly intertwined meaning they are coiled and twisted with no particular alignment. When the film is warmed the structureless regions of the chains are straightened and aligned to the direction of orientation. More simply the molecules reorient from their initial random pattern to ultimately fit the mold of its contents. When cooled properly the films molecular characteristics are set so it remains in this stretched state until heat energy is applied for the molecule chains to shrink back to its original form
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