Inks & Toner
Ink and toner manufacturing depends on fine particle size reduction to disperse pigments into a carrier fluid or resin, producing consistent color, print quality, and viscosity. Norstone, Inc. supplies grinding media and dispersing blades for ink milling and toner particle size reduction, covering both liquid ink dispersion and the dry milling processes used in toner production. Media selection depends on the pigment or resin composition being processed, the target final particle size, and the level of contamination the finished product can tolerate.
Recommended Products
Ink and toner production draws on several grinding media families depending on the specific formulation and equipment in use. Zirconia Grinding Media, including yttria and cerium stabilized subtypes, is commonly specified for fine particle size reduction in liquid ink dispersion, where its density and low contamination profile support consistent color and print quality. Silica Grinding Media, particularly zirconium silicate, is used as a lower-cost alternative to pure zirconia for applications where the finer color and contamination control of zirconia is not required. Alumina Grinding Media is specified across a range of purity levels depending on the hardness and contamination sensitivity of the ink formulation.
For applications tolerant of a degree of metal contamination, Steel Grinding Media, including carbon steel and chrome steel, is used in some toner and industrial ink milling operations, though this is less common than in darker paint formulations, since ink and toner applications generally require finer, more consistent particle size distributions than steel media typically provides. Where an application requires hardness and wear resistance beyond what the standard ceramic families offer, Exotic Grinding Media, including tungsten carbide and silicon carbide, is evaluated instead.
Dispersing and mixing of ink and toner formulations is generally handled through High Shear Impellers for pigment wetting ahead of a milling step, with fine particle size reduction carried out in a Mill matched to the grinding media selected.
Selecting the Right Grinding Media
Selecting grinding media for ink and toner applications generally starts with the target final particle size. Liquid inks, particularly inkjet formulations, typically require finer particle size distributions than toner powders, which favors denser, harder media families such as zirconia over softer alternatives such as glass or silica. Toner production, which involves dry milling of resin and pigment combinations, has different wear and contamination considerations than liquid ink dispersion, since the finished toner particle interacts with print equipment components rather than remaining in a liquid suspension.
Contamination tolerance is the second major factor. Because ink and toner color consistency is highly sensitive to visible contamination, media families that introduce minimal color-affecting contamination, including zirconia, alumina, and silica, are generally preferred over steel media for most formulations. Where a formulation can tolerate some contamination, or where cost is the dominant factor in a high-volume production run, silica or a lower-purity alumina grade may be evaluated as a lower-cost alternative to zirconia.
Hardness and wear resistance of the pigment or resin also affect media selection. Harder pigments wear softer media more quickly, increasing media consumption and the risk of introducing media fragments into the finished product. Where this becomes a limiting factor, exotic media families such as tungsten carbide or silicon carbide are evaluated for their greater hardness and wear resistance, despite the higher material cost relative to the standard ceramic families. The Grinding Media Selection Guide provides a full comparison across all seven material families for narrowing these options against a specific ink or toner formulation.