Blown Film extrusion
Blown film extrusion is a technology that is the most common method to make plastic films, especially for the packaging industry
Details about Blown film process
The process involves extruding a tube of molten polymer through a die and inflating to several times its initial diameter to form a thin film bubble. This bubble is then collapsed and used as a lay-flat film or can be made into bags. Usually polyethylene is used with this process, and other materials can be used as blends with these polymers.