Blown film extrusion is a manufacturing process used to create plastic films. In this method, plastic pellets are heated until they melt and then forced through a circular die, forming a thin tube of molten plastic. This tube is then inflated with air, creating a bubble that expands to the desired thickness and width. Once the film reaches the appropriate size, it is cooled and flattened. The resulting film can be used for various applications, such as packaging materials, bags, and protective coverings. This process is popular due to its efficiency and ability to produce high-quality films.