The primary raw materials for light-blocking black films are typically polymer-based, including polyethylene (PE), polypropylene (PP), and polyester (PET). These base materials determine the film's fundamental mechanical and processing properties-such as flexibility, tensile strength, and dimensional stability-and constitute the core components of the film's structure.
Carbon black is the most critical additive for achieving light-blocking functionality. Possessing exceptional light-absorbing capabilities, it effectively absorbs visible light and prevents transmission, serving as the key functional filler that dictates light-blocking performance. Factors such as particle size, structural morphology, and the degree of dispersion within the resin directly influence the film's light-blocking efficacy and the uniformity of its appearance.
Various auxiliary agents are also incorporated during production to enhance processing and end-use performance; these include antioxidants, lubricants, dispersing agents, and processing stabilizers. These additives help improve melt flow and prevent material degradation during processing, while simultaneously boosting the film's stability and durability, ensuring consistent overall performance across diverse application environments.
