Plastic film

Plastic film is a thin continuous polymeric material. Thicker plastic material is often called a "sheet". These thin plastic membranes are used to separate areas or volumes, to hold items, to act as barriers, or as printable surfaces. 
Plastic films are used in a wide variety of applications. These include: packaging, plastic bags, labels, building construction, landscaping, electrical fabrication, photographic film, film stock for movies, video tape, etc.
Materials.
Almost all plastics can be formed into a thin film. Some of the primary ones are:
Processes.
Plastic films are usually thermoplastics and are formed by melting for forming the film. 
Further processing.
Plastic films are typically formed into rolls by roll slitting. Often additional coating or printing operations are also used. 
Films can be modified by physical vapor deposition to make metallised films. Films can be subjected to corona treatment or Plasma processing; films can have release agents applied as needed.