Coatings are applied to the protect the printed pages from moisture, extreme temperatures, scuffs, scratches, and frequent handling. They are also used to draw the eye to a particular element on the page. We offer four types of print coatings: overprint varnish, aqueous coating, lamination, and UV coating. All four are available in matte, dull, satin, and glossy. Please note that coatings appear differently on uncoated paper versus coated paper. If you plan on writing or rubber stamping on your publication, we suggest not using any coating as it will limit your ability to write on the paper.
LaminationLamination comes in two types, film-based and liquid-based. Either a clear plastic film is laid down over the sheet of paper or a clear liquid is spread over the sheet and dries (or cures) like a varnish. Liquid lamination protects paper from water but is slow to apply and is costly. However, it provides a strong, washable surface.
Film lamination features a high gloss finish with a very smooth, tough finish. This durable plastic film has advantages over liquid coating at a slightly higher cost. Film lamination will not yellow with age, flake off, and is scratch resistant. In addition, the ink is protected from cracking and provides an odorless/wipeable surface.
UV Coating Ultra-violet coating is the glossiest coating available and is less commonly available in dull and matte. UV coating is a clear liquid that is spread over the paper like ink. It can be used as a spot covering to accent a particular image or logo on the page or as an full page (flood) coating. UV coating gives more protection and shine than varnish or aqueous coating. UV coating is unsaturated polyester or polyacrylate based and when exposed to ultraviolet light, dries instantly. UV coating offers excellent rub protection.
UV coating is applied as a separate finishing operation as either a flood coating or (applied by screen printing) as a spot coating. Keep in mind that this thick coating may crack when scored or folded.
Aqueous Coatings
Aqueous coatings are water-based and are applied by an inking unit of the press or in a special coater. Aqueous has the advantage over varnish because it dries immediately and has glossy characteristic that falls between varnish and UV coating. Since aqueous can be applied over wet ink, can seal the printed sheet, and can dry immediately, it has the practical advantage of reducing handling time for trimming and other post-press operations.
The disadvantage of aqueous is that since it is water-based it can cause paper to curl, particularly on thinner paper weights. Additionally, certain pigments may bleed with aqueous. Aqueous coating is only recommended for coated sheets as it will be absorbed by uncoated paper stocks
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