Introduction to the characteristics of BOPP film and BOPET film

When choosing adhesive label materials, we often hear the abbreviations BOPP and BOPET for these two plastic films. But what exactly is the difference between them? 

BOPP is an abbreviation for "Biaxially Oriented Polypropylene", which refers to a type of film made of biaxially oriented polypropylene. Its production process involves first forming a polymer melt of polypropylene into a sheet or thick film through a long and narrow head. Then, in a dedicated stretcher, the film is stretched simultaneously or stepwise in two perpendicular directions (longitudinal and transverse) at a certain temperature and set speed, and is subsequently cooled or heat-treated appropriately or undergoes special processing (such as corona treatment, coating, etc.) to produce the final film. BOPP film is a very important flexible packaging material. It is colorless, odorless, tasteless, non-toxic, and possesses high tensile strength, impact strength, rigidity, toughness, and good transparency. Due to its low surface energy, BOPP film requires corona treatment before being coated or printed. However, after corona treatment, BOPP film exhibits excellent printability, allowing for color-keyed printing to achieve a beautiful appearance, making it commonly used as the surface layer material for composite films. 

BOPET film, or Biaxially Oriented Polyethylene Terephthalate film, is characterized by its high strength, good rigidity, transparency, high gloss, low heat shrinkage, anti-static properties, and high temperature resistance. However, BOPET has a high density and is susceptible to erosion by strong alkalis, so care should be taken when using it.