Application
Paper-Making
Enhancing Strength and Durability: Chemical powders such as calcium carbonate (CaCO₃) and kaolin clay are commonly used as fillers to improve the mechanical strength of paper. By filling the voids between fibers, these particles increase the density and rigidity of the sheet, making it more resistant to tearing and creasing. Additionally, they can improve the folding endurance and printability of paper.
Improving Brightness and Opacity: Titanium dioxide (TiO₂) is a highly effective chemical powder used to enhance the whiteness and opacity of paper. Its high refractive index scatters light, resulting in a brighter, more opaque sheet. This is particularly important for printing applications where sharp contrast and vivid colors are essential.
Promoting Ink Holdout and Printability: Certain alumina-based and synthetic polymers, when added as powders, can improve the ink holdout properties of paper. This means the ink sits on top of the paper surface rather than soaking in, resulting in crisper, more vibrant prints.