When you look around your grocery store you will quickly notice that many companies are using a flow wrap packaging to wrap their product. You have two options when you choose flow wrapping for the look of your package. Vertical and horizontal are the two methods used the most. Candy bars or energy bars are packaged by a horizontal method and chips, peanuts and other loose products are done with the vertical form fill and seal method. The type of flow wrap film used is usually a lamination type structure film. This means there is more than one film that produces the packaging film.
Flow Wrap Film
The reason some products use two or more films to make up their package is for barrier reasons or the feel of the packaging. Some like a soft package and some like a more stiffer type feel.