The knife-over-roll coater is one of the first coating methods developed for the web converting industry, first introduced for the textile industry. Simple to operate, and relatively inexpensive compared to other roll coating methods, KOR coaters are frequently selected for both water based and solvent based coatings, typically for applying relatively thick wet layers of more viscous coatings.
While KOR configuration is the most popular, Pyradia offers a complete range of knife coaters, designed according to the highest quality standards for long life and easy maintenance: KOR Knife-Over-Roll, KOP Knife-Over-Plate, KOA Knife-Over-Air and Comma coaters.
KOP and KOA coaters will be considered for textile applications, while KOR coaters will be selected for their higher coating thickness precision. The precision ground back-up roll is commonly chrome plated and can be driven or not, depending on the substrate tensile strength. Coating width can be easily adjusted using rail mounted edge dams, while coater knifes can be rapidly removed for cleaning, thanks to our proprietary toolless knife clamping system.
