When you look through paper samples, one of the first things you probably notice is whether the sample is coated or uncoated. Coated papers feel smooth to the touch because they have a coating of clay and other substances. This coating causes the paper to reflect light more and absorb ink less than uncoated papers.
Many different types of coated papers exist. To make them, the paper mill starts with an uncoated piece of paper and applies different types of coatings to give the paper different qualities. We call the uncoated stock the base sheet. We refer to the thinnest type of coating as a film or wash coat, which acts as a sealer to prevent ink absorption. The next step is a matte coating. A matte coat has more clay than a wash coat and is good for projects with a lot of text. However, if your project involves large areas of heavy, dark ink coverage, matte coat papers can sometimes appear somewhat mottled.
The next step is a dull, suede or velvet coat. Like matte coatings, dull coatings are good for text readability because they are not as reflective as a gloss coat. Glossy coatings actually have the same amount of clay as a dull coat, but the mill smoothes and polishes the sheets using a process called calendaring. They run the paper between rollers, which compress and smooth the paper. Glossy coatings are great for color photographs, but the same shiny qualities that make photos look great can make text harder to read because of the glare.
Gloss coated papers can be somewhat less white than dull coated papers because the heat required to polish the paper also can add a slightly brownish cast. Coated papers often include shades of white named with terms, such as balanced, warm and cold to indicate the hue. Cream and other off-white tones are available, but because we so often use coated stock for showing off vibrant four-color printing, the paper itself is rarely brightly colored.
As you can see, there are many different kinds of coated paper stocks, and each is suited to different tasks. It can be overwhelming to tackle these choices alone. Contact us early in the planning stage of your next printing project, and we’ll help you choose the best paper and coating for your needs.