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 […]
Perfluoroalkyl Ethyl Toxicity Concerns in Food Packaging In January 2016, the U.S. Food & Drug Administration (FDA) published a final rule that prohibited the use of three specific perfluoroalkyl ethyl containing chemicals because of toxicity concerns. These chemicals had been in use to make paper and paperboard packaging resistant to oil and water for use […]
Our world is an ever-changing one as evidenced recently by the appearance of Covid-19, unusual weather, and ever-evolving new technologies and products. These changes are presenting both opportunities and challenges for UV coatings with their ability to resist attack by chemicals, and various consumer and industrial products. Currently, we are advised to wear masks, wash […]
A surface that is easy to wet is necessary when printing and coating in order to achieve good adhesion and appearance results. “Wetting” is the ability of a liquid to spread, contacting a solid surface. All liquids have a surface tension and all solids have a surface energy. Both are measured as a force applied over an area, expressed as a […]
Cold Foiling growth and productivity improvements have come rapidly. Foiling is known for its ability to add eye-catching visual effects to all aspects of printing creating brand differentiation. Foiling has proven to be effective in attracting and persuading shoppers to choose one product over another.
Recycling and Sustainability in UV and EB Cured Packaging Paper and paper board products printed and coated with UV and EB curables are recyclable. They have always been recyclable into lower grades of paper known as “greyback” or “fillerboards.” These grades include materials used to produce folding cartons, corrugated, wallboard, tissue paper, roofing paper, and […]
Aqueous coatings formulated for the graphic arts industry may be thermoplastic or thermosetting, solution or emulsion polymer blends. Thermoplastic coatings dominate. They are comprised of approximately 60% water, plus property enhancing components including plasticizers, waxes, surfactants, coalescent aids, antifoams and possibly optical brighteners.
UV LED Curing Ultraviolet (UV) curing has been historically dominated by the medium pressure mercury arc (Hg) lamp. This technology is now being gradually supplanted by LED (light emitting diode) semiconductor technology designed to produce usable UV curing radiation.