Blocking is a term given to describe sticking between two or more layers of coated substrate, which may be printed, or unprinted, and in roll, sheet, or package form.
Aqueous Coatings create Special Effects Many different special effects may be obtained using aqueous coatings that are formulated to provide various levels of gloss. This range in gloss can extend from a very flat matte (reflecting only 15% of light) to very high gloss coatings that are able to reflect as high as 90% + […]
What is Viscosity? Viscosity tells us how thick or thin a liquid is. Viscosity is the property of a fluid that causes it not to flow easily because of the resistance of its molecules. When we use coatings, we need to understand viscosity, because it is key to accurate application, and a finished coated product […]
How Foam is Formed Foam consists of bubbles that are formed when air or a gas is trapped in a liquid or solid substance. Certain conditions are required for foam to be formed. Mechanical work or agitation is required, as are surfactants that reduce surface tension, so that work increases surface area. Also, foam must […]
Aqueous Blister Coatings Take Over Talk about a market change over! It wasn’t too many years ago that the blister card market was dominated by solvent based blister card coatings. Not only has the blister card market grown by leaps and bounds, but the dominating solvent based blister card coatings have been replaced by aqueous […]
Aqueous coatings are complex blends that may have foaming issues. Here are some ways to control foaming. Aqueous coatings are complex blends with the typical formula consisting of styrene/acrylic co-polymers, amines, water, plasticizer, waxes, surfactant, and an anti-foamer. The balance of each material portion to the total is important and enables a given target performance […]
Why use Aqueous Coatings in Lithography? Productivity! When a sheetfed offset lithographer is asked, “Why do you use overprint varnishes?” The stock answer is that conventional oleoresinous overprint press varnishes are used to protect conventional litho inks. An expanded answer adds that rub and scuff resistance can be improved and the finish can range from […]
Cork’s Aqueous Multiwall Bag Coating is an aqueous overprint varnish designed for multiwall bags. It has good gloss and rub resistance. Formulations: Flexo Gravure Features: Non-yellowing Low foaming Good CoF Slide Angle properties Physical Properties: Viscosity 17 – 20 Seconds #3 Signature Zahn @ 70°F 200 – 300 cps Solids 43% – 46% pH 8.8 – […]