1. Pigment-based inks:
- Pigments: These are insoluble solid particles that provide color to the ink. Common pigments used in inks include carbon black, titanium dioxide, iron oxides, and various organic pigments.
- Resins: Resins are polymers that bind the pigments together and help the ink adhere to the paper or other surfaces. They are typically made from synthetic materials such as acrylic resins, polyester resins, or waxes.
- Solvents: Solvents are liquids that dissolve the resins and pigments to form a fluid ink. Common solvents used in inks include water, alcohols, glycols, and hydrocarbons.
- Additives: Inks may also contain various additives to improve their properties, such as flow improvers, wetting agents, drying agents, and preservatives.
2. Dye-based inks:
- Dyes: Dyes are soluble coloring agents that dissolve in the ink's solvents. They are typically made from organic compounds such as azo dyes, phthalocyanine dyes, or triarylmethane dyes.
- Solvents: Dye-based inks use solvents to dissolve the dyes and create a liquid ink. Common solvents used in dye-based inks include water, alcohols, and glycols.
- Additives: Similar to pigment-based inks, dye-based inks may contain additives to enhance their properties.
3. Specialty inks:
- UV-curable inks: These inks contain photoinitiators that cure and solidify when exposed to ultraviolet light. They are commonly used in industrial printing applications for their quick drying time and durability.
- Edible inks: Edible inks are made from food-grade ingredients and are used for printing on edible surfaces such as cakes, cookies, and confectionery items.
- Magnetic inks: Magnetic inks contain magnetic particles and are used in applications such as check printing and security features where magnetic reading is required.
