BOPP film, also known as biaxially oriented polypropylene film, is a type of polypropylene film produced through the biaxial stretching orientation technology. BOPP is one of the most widely used and largest-volume plastic packaging films in the world today. With its outstanding comprehensive performance and cost-effectiveness, it has become a "benchmark" material in the soft packaging industry.
Poor printing adhesion
Solution: Check corona treatment
Printing registration error
Solution: Check film tension control and dimensional stability.
Low composite peel strength
Solution: Check glue selection, gluing amount, and composite process parameters.
Weak bag sealing edge
Solution: Adjust heat sealing temperature, pressure and time.
Bag sealing edge becomes brittle
Solution: Excessive heat sealing temperature，need to adjust and the temperature.
Uniformity of thickness: This directly affects the mechanical properties, appearance and subsequent processing stability of the film.
Surface tension: It must be stable at 38 dynes/cm or above to ensure good adhesion of the ink and glue.
Coefficient of friction: It is divided into dynamic friction coefficient and static friction coefficient, which determines the smoothness of the film's operation on the high-speed automatic packaging machine.
Thermal shrinkage rate: This affects the dimensional stability and appearance of the packaging.
