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Blown film masterbatch: The coloring core of plastic films！
Blown film masterbatch is a high-concentration colorant specifically designed for plastic blown film forming processes, composed of pigments, carrier resins, and dispersion AIDS, etc. This functional masterbatch, through precise color matching and stable dispersion performance, provides uniform and bright colors for various plastic films, while ensuring the smooth progress of the blown film production process.
Composition structure and technical principles
Blown film masterbatch usually consists of three basic components: the pigment as the coloring main body, the carrier compatible with the base resin, and the additive system to ensure uniform dispersion. Among them, the pigment content can reach 20%-50%, and the carrier resin is usually selected from polyolefin materials such as polyethylene or polypropylene that have good compatibility with the blown film base material. Dispersants are used to reduce the cohesion between pigment particles and promote their uniform distribution in the melt.
During the blown film processing, the color masterbatch and the natural-color plastic particles are mixed in a predetermined proportion and then heated and melted by a screw extruder. Under the action of shear force, the pigment particles in the color masterbatch are released from the carrier and evenly dispersed throughout the melt system. When the melt is extruded through the annular die head to form a film bubble, the pigment has achieved uniform distribution at the microscopic level, thereby ensuring the consistency and stability of the film's color.
Performance requirements and quality standards
High-quality blown film masterbatch needs to meet multiple technical requirements. It must have excellent dispersibility to avoid the formation of color spots or stripes on the film surface. Good rheological properties match those of the base resin to ensure the stable formation of film bubbles during the blown film process. Heat resistance is also an important indicator. It needs to withstand the processing temperature of the blown film process without color change. In addition, the appropriate addition ratio should not significantly affect the mechanical and optical properties of the film.
For different application scenarios, blown film color masterbatches also need to possess corresponding special properties. For outdoor films, the color masterbatch is required to have excellent weather resistance and UV resistance. Masterbatches used for food packaging need to comply with relevant hygiene and safety standards.
Application fields and development trends
Blown film masterbatches are widely used in multiple fields such as packaging, agriculture, and construction. In the packaging industry, it is used to produce daily packaging materials such as shopping bags and food packaging films. In the agricultural field, colored mulching film can achieve specific agronomic effects through color adjustment. In the construction industry, both colored greenhouse films and waterproof membranes rely on their stable coloring performance.
At present, the technology of blown film masterbatch is developing towards environmental protection, functionalization and high efficiency. Environmentally friendly products are gradually receiving attention, such as those using inorganic or organic pigments with low heavy metal content. Multifunctional composite masterbatches have become a research hotspot, endowing films with special functions such as anti-static and barrier properties while achieving coloring. The application of the automated color matching system has also enhanced the accuracy and efficiency of color matching.
Blown film masterbatch, as an important additive in plastic processing, its technical level directly affects the aesthetic appearance and quality of the final product. With the advancement of materials science and processing technology, blown film masterbatches will continue to provide the plastic film industry with more high-quality and efficient coloring solutions.