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Bi-Oriented Polypropylene (BOPP)

When the polypropylene film (PP) is extruded and stretched in both the machine and transverse directions in the machine direction, is called bi-oriented polypropylene. The biaxial orientation increases strength and clarity. BOPP is widely used as a packaging material for packaging products such as snack foods, fresh produce and confectionery. It's easy to coating, printing and cutting to give the appearance and properties necessary for use as packing material. This process is called conversion. It is typically produced in large rolls, which are cut in cutting machines into smaller rolls for use in packaging machines.

The extruded polypropylene has a very similar process to the manufacture of high density polyethylene, because their chemical characteristics are very similar. It is presented in films for packaging of different uses, having its greatest application in the food industry.

When used in the final packaging of the product, polypropylene can be combined with other plastics or aluminum foil to increase its mechanical strength and gas permeability.

The main advantages that make BOPP an expanding material for the manufacture of flexible packaging at the expense of other materials include:

  • Low cost
  • High chemical resistance to solvents
  • Easy molding
  • Easy Coloring
  • High resistance to bend fracture or fatigue
  • Good impact strength above 15 ° C
  • Good thermal stability Increased sensitivity to UV light and oxidizing agents, suffering degradation with ease.