The biaxially oriented polypropylene film, namely BOPP film, uses the melt of high molecular polypropylene as the material and is produced by the tube film method Hopping film method. The properties of BOPP films obtained by different processing methods are different. The BOPP nanny produced by the flat film method has a higher stretching ratio, so it has higher strength and more uniform thickness than the BOPP film produced by the tube film method.
BOPP film is colorless, odorless, five poisons, and possesses certain rigidity, toughness, impact resistance, high tensile strength and transparency. The surface energy of BOPP film is low. In order to ensure good printing adaptability, corona treatment should be carried out before gluing or printing, so that color printing can be achieved to achieve colorful and exquisite appearance.
For better comprehensive performance considerations, in the actual production process, BOPP film is produced by a multi-layer composite method, which is composited with the same different materials to meet the needs of some special industries. For example, BOPP can be combined with PE, PO, PT , LDPE and other materials are compounded to produce high temperature resistance, low temperature resistance, moisture resistance, gas resistance and other properties.
Of course, BOPP film also has shortcomings. In the high-speed production process, it is easy to generate static electricity, so static electricity removal work must be carried out during the production process. In addition, the heat-seal performance of BOPP film is not good enough. In order to obtain a heat-sealable nanny, you can apply heat-sealable resin glue or solvent glue on the surface of BOPP film after corona treatment. Another point is that no cuts should be left on both ends of the film, otherwise it will be easily torn during printing or lamination.