- Blown films are what plastic sheeting and tube films are created by the manufacturing process. These sheets or tubes can either be completely cylindrical, or other objects can be placed into them to create useful objects like shopping bags, trash bags, or cling wrap.
- One of the many methods used to manufacture polymers is the extrusion of blown films. This process is used to create both commonplace and specialist polymer films, such as shrink, stretch, barrier films (used to protect deli meat), frozen food packaging, and shopping bags, which are frequently used in packaging.
- The most popular polymers for blown film extrusion are polypropylene and polyethylene, though there are other varieties as well (LDPE, HDPE and LLDPE). This process can produce monolayer films as well as more intricate multi-layer films that blend many plastics into a single film by co-extrusion.
