Inline & offline digital printing primers certified for use with HP Indigo presses.
Water-based overprint coatings increase durability and enhance the look & feel of inkjet-printed materials.
High-performance primers for inkjet that improve print quality & ink adhesion on film & paper.
Advanced materials designed to enhance the performance and processing of agricultural products.
Recyclable water-based coatings that confer high barrier to paper-based packaging and wraps.
Enhancing composite performance through optimized fiber-polymer interface adhesion
Water-based sizing solutions designed to optimize interfacial adhesion in composites using carbon fiber.
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Plastic is often the best option for packaging due to its light weight and high barrier, helping avoid food waste.
News (Thursday, 2 November 2023)
From gardening to light construction to preparing medical supplies, our associates volunteered across the globe to support local charities.
News (Monday, 11 September 2023)
These groundbreaking new in-line primers feature wide substrate compatibility and superior runnability to help simplify press room management.
News (Thursday, 7 September 2023)
Matt Adler will expand our strategic relationship with HP Indigo Digital Press owners & digital printing value chain stakeholders.
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Michelman’s DigiPrime® Icon brand of primers, designed for converters who prepare substrates off-line, provides several performance advantages including better runnability, cleanability, lower odor, and superior adhesion.
The primers, which are press-ready, water-based, and designed for flexographic or gravure applications, optimize most film and paper substrates. They are very stable in liquid form, with a shelf life of 12 to 24 months if stored unopened at moderate temperatures. Coated substrates have a shelf life of 12 months or more and will not yellow or show degradation of print quality or adhesion.
These guidelines are applicable for DigiPrime® Icon 8000, DigiPrime® Icon 8010, and DigiPrime® Icon 8020.
Corona treatment is recommended when using film, not only to keep control of the surface energy, which needs to be above 42 dynes/cm to achieve optimum wet-out and full adhesion, but also to refresh the film even when it is above 42 dynes/cm. Use a dyne pen or dyne solution to check the corona level before priming.
Clean the coating system thoroughly by flushing the supply lines and pumps with clean water, then cleaning the coater pans and rollers. Many ink or water-based primer chemistries used in the conventional printing industry can be incompatible. Do not use solvent-based cleaners. DigiPrime® primers will react negatively, becoming very viscous and dense.
A minimum web temperature out of the dryer/oven between 45-60°C is required to obtain full adhesion after drying. The web must cool to less than 30°C before rewinding the roll to prevent blocking. It is essential to have good drying in order to stock the primed reels in the right condition. Primed reels are equipment that should be appropriately stored, until printing, in a cart where the reels can be hung or placed vertically. Both ways eliminate the pressure on the primed reels, avoiding their possible blocking and deformation. Proper drying is critical for adhesion, block prevention, and correct end specifications.
DigiPrime® primers should be stored in an area above 5°C and protected from freezing. Do not use if grit or gels form due to low temperature.
Although press-ready, DigiPrime® off-line primers can be diluted with deionized or soft water. Adding more than 20% weight of deionized water will change viscosity and solids content and alter the performance of the coated substrates.
DigiPrime® off-line primers should not be allowed to dry on the anilox. Keep the coater moving, rollers turning, and surfaces wet. Water or water/soap mixture is the preferred method for clean-up, but the following suppliers also offer suitable cleaners:
The recommended target coat weight of DigiPrime® on most surfaces, undiluted, is 1-1.5 gsm wet. However, depending on the absorbency or texture of a surface, higher coat weights may be needed and should be established by experimentation. Excessive coat weight may result in blocking the wound roll, and coat weight that is too high or too low may result in a lack of adhesion. Verify the coat weight and apply the primer according to substrate type.
Quality primer adhesion involves combining Michem® Indicator 001 with a tape test:
Materials and process for quality ink adhesion include:
86% of the ink adhesion should be achieved after 15 minutes.(3 Star HP Indigo Media Certification)
Monitor the use of DigiPrime® off-line primers over a known length and width of media:
Gravimetric Method: Checking coat weight on plain films can be achieved by measuring the weight difference. Obtain an accurate balance because of the very low dry coat weight.
DigiPrime® Icon 8000
uncoated, mottled, semi-gloss, and high-gloss paper
general purpose paper
DigiPrime® Icon 8010
uncoated, mottled, semi-gloss, and high-gloss paper, PE
DigiPrime® Icon 8020
general paper and film
flexible packaging and labels
Published on: May 4, 2023