Production of BOPP film involves initially extruding molten polypropylene polymer through a narrow slit to form sheets or thick film. It is then stretched in a specialized stretching machine, both longitudinally and transversely, under controlled temperature and speed conditions. The film undergoes appropriate cooling, heat treatment, or special processes (such as corona treatment or coating) to achieve its final form.
BOPP film advantages
- BOPP film is a crucial material in flexible packaging, known for its colorlessness, odorlessness, tastelessness, non-toxicity, high tensile strength, impact resistance, rigidity, toughness, and excellent transparency.
- The surface energy of BOPP film is low, requiring corona treatment before gluing or printing. Post-treatment, BOPP film exhibits excellent print adaptability, allowing for multi-color printing and achieving attractive visual effects, making it commonly used as a surface layer in composite films.
BOPP film disadvantages
- BOPP film has its drawbacks, such as susceptibility to static electricity buildup and lack of inherent heat-sealing properties. When operating at high speeds, static electricity can accumulate on BOPP film, necessitating the use of static eliminators. To enable heat sealing, BOPP film can be treated with corona discharge followed by coating with heat-sealable resins like PVDC latex, EVA latex, solvent-based adhesives, or produced using extrusion coating or co-extrusion methods.
- The film finds wide applications in packaging bread, clothing, footwear, as well as cigarette and book covers. While BOPP film exhibits increased tear strength after stretching, its secondary tear strength remains low, requiring careful handling to prevent tearing during printing or lamination. BOPP-coated adhesive labels are used to produce large quantities of packaging tape, highlighting a significant market for BOPP.
- Higher cost: BOPP film is priced higher compared to traditional films like PE and PET.
The above summarizes the advantages and disadvantages of BOPP film as compiled by the editor, aimed to provide useful insights! For more information on BOPP film, stay tuned with us!
Common types of BOPP films include general-purpose biaxially oriented polypropylene film, heat-sealable bopp film, cigarette packaging film, pearlescent bopp film, metallized bopp film, and matte film.