BOPP (Biaxially Oriented Polypropylene) packaging film is a very important flexible packaging material, especially in the tape industry. BOPP film is colorless, odorless, non-toxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency.
The surface energy of BOPP packaging film is low, and corona treatment is required before gluing or printing. After corona treatment, BOPP film has good printing adaptability and can be overprinted to obtain exquisite appearance effect, so it is often used as the surface layer material of composite film. In order to obtain a heat-sealable BOPP packaging film, a heat-sealable resin glue solution can be coated on the surface of the BOPP packaging film after corona treatment.
The induced tear strength of BOPP packaging film increases after stretching, but the secondary tear strength is very low. Therefore, no cuts should be left on both ends of the BOPP film, otherwise the BOPP film will be easily torn off during printing and lamination. After BOPP is coated with self-adhesive, clear box sealing tape can be produced, which is a market with a large amount of BOPP.
The huge BOPP tape jumbo roll is used as raw material for the companies specialized in cutting huge reels into smaller BOPP tape rolls with cutting machines. BOPP packaging film can be produced by tube film method or flat film method. The properties of BOPP packaging film obtained by different processing methods are also different. The BOPP packaging film produced by the flat film method has a higher stretch ratio, so the strength is higher than that of the tube film method, and the uniformity of the film thickness is also better.
In order to obtain a better overall performance, it is usually produced by a multi-layer composite method during use. BOPP packaging film can be compounded with a variety of different materials to meet the needs of special applications.
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