Printing is a process in which text and images are reproduced on various materials. There are various printing methods and depending on the printing method, various types of ink are used. The ink used in printing can be classified into 4 different categories such as water, liquid, paste, and powder.
You can also look for solvent printing machines at http://www.inkjetmonkey.com/solvent-printers.
The paste is often used in offset printing and there are various types of paste ink such as cold sets, heat sets, and energy that can be cured. Some types of energy that can be cured are electron beam that can be cured and can be cured with ultraviolet.
While curable energy offers the highest print quality, the heat setting is most often used. Curable energy also requires special equipment that makes it one of the most expensive types of ink used in offset printing.
Solvent ink consists of a mixture of organic chemical compounds and volatile organic compounds. These materials have high vapor pressure and the colors in this type of ink are achieved through pigments that make them resistant to fading.
Aqueous ink is mainly used on desktop inkjet printers. This consists of a mixture of pigments or dyes, glycol and water. Aqueous offers a choice of vibrant and varied colors the only disadvantage of this ink is that it is not waterproof and can be swept from the surface without lamination or special coatings to protect the ink.