Cork Tech Talk Blog

Cork’s CORK-CLEAN™ UV blanket, roller wash, and system flusher for UV inks and coatings is your answer for fast, effective, and safe clean-up. CORK-CLEAN™, formulated specifically as a companion wash-up product for Corks’ Green20™ and Greensoft™ UV coatings, has proven to be effective as an equipment, blanket, roller, and anilox wash for all commercial UV inks and coatings.

Read more: Cork-Clean™ Boosts Productivity

Preprint?

Preprint is the term used to define roll to roll printing of the outside liner of a corrugated box, before corrugating and converting operations. In corrugating, the corrugated medium (fluting) is glued between the preprinted liner and the inner liner, giving the structure rigidity, strength and cushioning. During corrugating the liners pass over heated plates curing the glue, and subjecting the face of the liners to high heat and pressure such that preprinted inks must be protected.

Read more: High Graphics Corrugated Preprint Excels with Top Coatings

The U. S. Food & Drug Administration (FDA) has banned three specific perfluoroalkyl ethyl containing chemicals because of toxicity concerns. The chemicals have been used to make paper and paperboard packaging resistant to oil and water for use in contact with aqueous and fatty foods. Affected is 21 CFR Part 176 with §176.170 amended, effective January 4, 2016.

Read more: FDA Bans Chemicals in Food Packaging Coatings

Brand marketers have long sought to differentiate their products from competition to create a selling advantage. Packaging and labeling have often been the vehicles, used by designers, to make a notable difference promoting eye, and shelf appeal to stimulate product sales. Aesthetic shapes, graphics, and special visual effects have led the way.

Read more: Creating Dazzling Cast & Cure® Finishes

FDA: Regulations to Ensure Safety of the Food Supply

Congress, in 1958 enacted the Food Additives Amendment to the Federal Food, Drug and Cosmetic Act (FFDCA). This action gave the U. S. Food and Drug Administration (FDA) authority to ensure the safety of food by regulating food additives that may be either directly or indirectly added to food.

Read more: 7 Essentials of FDA Food Contact Coatings

Setting & Drying Inks.

It’s all about the setting and drying of conventional sheet fed offset inks. Anti-set-off spray powder is used to prevent set-off, the unwanted transfer of wet ink to an adjacent sheet, in a press end pile. Spray powder not only provides a physical spacing between sheets of substrate, but also allows the circulation of oxygen containing air necessary to the drying (oxidation) of inks.
Anti-Set-Off Spray Powder

Sheetfed offset lithography is a printing process that feeds sheeted substrate into the press one sheet at a time for printing. After printing the sheets are stacked in the press end delivery section one sheet upon another in a pile.

Read more: 5 Spray Powder Usage Concerns

Cork Industries Formulates Benzophenone Free UV Coatings

Benzo Free Expert Help (610) 522-9550Photoinitiators (PIs) are a key component and a cost driver for UV curing products. They are capable, as their name implies, of initiating or starting a photoreaction. This occurs when a PI absorbs radiation energy from light exposure to produce highly reactive free radicals and ionic species. These have the capability of catalyzing or starting chemical reactions, or changes in certain formulated materials. One such photoinitiator is Benzophenone.

Benzophenone (BP) or Benzo, has been generally recognized as the most used PI globally. It is known for its effectiveness as an initiator, and its relative low cost.

In the last several years, a health concern has developed, especially in Europe, regarding the migration of small molecule PIs, into foods from indirect food contact packaging materials. It is thought that a PI like methyl benzophenone (MPB) can reach packaged food in two ways, (1) an indirect transfer from the vapor phase of semi-volatile PIs, (2) from direct contact stemming from permeation or set-off when cured printing inks and coatings come in contact with the inside of a package surface as packaging material is stacked or processed in roll form. When migration into food has been found, the packaged food and the packaging materials used have been removed from use.

Read more: Benzophenone Free UV Coatings and California Proposition 65

Before soft touch finishes we had to live with hard surfaced materials that were converted into products designed for our use. Think about it! Metals, stone, glass and wood are hard surfaced materials. Most plastic materials are hard surfaced materials, especially those that are used for non-disposable products manufacture.

Soft Touch GrowthThere has been exponential growth in the use of plastics recently due to the attractiveness of light weight, low cost and durability.

Plastic materials have found a tremendously wide range of applications because of these positive attributes. Plastic materials also have a negative side in that they tend to yellow after long term weathering, and are subject to scratching and chemical attack.

Read more: Soft Touch Print Coatings Deliver Perception of Quality
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About the Author

Elmer W. Griese Jr, having accumulated 35+ years of knowledge working in the coatings and printing ink industries has now authored the Cork Tech Talk News, newsletter since 1992 producing 112 issues. He remains dedicated to educating and illuminating technological progress that offers the potential to advance coating technology and its applications.

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