The black BOPET film, due to its excellent light-blocking property, high blackness and good mechanical performance, is widely used in advertising materials, printing packaging, labels, tape substrates, electronic insulation and other fields. In these application scenarios, the quality and performance of the film largely depend on the quality of the black masterbatch.
The BOPET Film Black masterbatch is a granular colorant made by using polyester (PET) as the carrier resin, with high-quality carbon black and polymer additives selected, and through processes such as twin-screw extrusion and melt blending. It plays a crucial role in the production of biaxially oriented polyethylene terephthalate (BOPET) films, directly influencing the blackness, covering power, dispersion, and surface quality of the films.
What is a film black masterbatch?
A film black masterbatch is a functional masterbatch made by using polyester (PET) as the carrier resin, adding high-concentration carbon black (with a standard content of up to 30%) and special dispersants, and then melting and mixing it through a twin-screw extruder and granulating. During the production of BOPET films, by mixing the BOPET Film Black masterbatch with the PET base material in a certain proportion and then extruding together, black and uniform BOPET films with excellent light-blocking properties can be obtained.
Compared with ordinary plastic color masterbatches, the BOPET Film Black masterbatch has a higher technical threshold. The thickness of the biaxially stretched film is usually only 12–50 micrometers, and it is necessary to maintain uniform blackness, no crystal points, and no stripes under such an extremely thin condition. This places extremely high requirements on the carbon black dispersion, carrier compatibility, filtration value and other indicators of the masterbatch.
When choosing BOPET Film Black masterbatch, the following points are recommended to be paid attention to:
1. Observe dispersion
The thickness of the film, especially the BOPET film, is very thin. The dispersion requirement for the black masterbatch is the highest. When purchasing, it is necessary to ask the manufacturer to provide a dispersion test report to ensure that the carbon black is evenly dispersed in the masterbatch, and to avoid defects such as crystal points and stripes in the finished film.
2. Consider blackness and coverage
Based on the requirements for blackness and coverage in different application scenarios, select the appropriate specifications of black masterbatch. For applications such as high-end advertising materials and optical insulating films, priority should be given to products with high blackness and strong coverage.
3. Check the filtration value and mesh replacement cycle
The filtration value is a crucial indicator for measuring the cleanliness and impurity content of the black masterbatch. The lower the filtration value, the fewer the impurities, and the longer the mesh replacement cycle. It is recommended that the manufacturer provide the filtration value test data.
4. Check the temperature resistance
The processing temperature of BOPET film is usually between 280–300℃. It is necessary to ensure that the black masterbatch does not decompose or precipitate within this temperature range. When purchasing, it is necessary to confirm the thermal stability test data of the masterbatch.
5. Consider the compatibility of the carrier resin
The carrier resin of the black masterbatch should have good compatibility with the base material resin. For film black masterbatch, PET should be used as the carrier to ensure good compatibility with the PET base material and not affect the mechanical properties and processing performance of the film.
6. Review the supplier's qualifications
Choose manufacturers that have comprehensive quality system certifications and strong R&D capabilities. Boli Di has a significant advantage in this regard.
