Inkjet varnish cured by UV LED technology

Technology description

The name of the technology: Inkjet varnish cured by UV LED technology
Challenge: Nowadays, varnishing is used not only to intensify the protection of the prints, but also to increase the attractiveness of the product's appearance (especially the packaging of various products, book covers, etc.). Printing with conventional varnishes poses some problems such as lower adhesion to polymeric materials and lower elasticity, which can lead to defect formation (cracking and peeling of the varnish layer) during subsequent processing of prints (bending, cutting, grooving, etc.). Although the use of varnishes cured by UV LED brings many advantages, varnishes cured by mercury lamp still dominate the market.
Description: The developed varnish cured by UV LED is suitable especially for digital inkjet varnishing machines utilized for printing of various materials (e.g. papers, cardboards, polymer foils). Varnish composition was optimized in terms of mechanical, optical and printing properties.

Benefits of using injekt varnish cured by UV LED
• electricity savings up to 75 % (against curing by mercury lamps) and related lower costs
• elimination of ozone formation
• possibility of immediate turning off/on the UV LED source
• higher adhesion and elasticity in comparison with commonly utilized varnishes
• creation of special varnish e¬ects (3D structures, etc.).

Monitored parameters during varnish composition optimization
• elasticity and adhesion of the varnish layer
• speed of curing/printing
• printing properties
• color after curing (yellowness)
• long-term stability
• viscosity
• surface tension
Commercial opportunity: The developed varnish is suitable especially for digital inkjet varnishing machines. End customers are all the companies engaged in outdoor advertising, label printing, small-format product printing (replacing pad printing or screen printing), printing on book covers, textile printing, 3D printing, etc.
IP protection status: Utility model granted (Application form No. 2021-39352, Registration No. 35783)
Development status:

Phase 3

Corresponds with TRL 5 and TRL 6

Technology validation and implementing it in real environment. Testing the technology outside of the laboratory and its adjustment to external conditions.

  • TRL 5 represents a state where the results of the real environment tests are known and there is an idea of how to deal with the problems found (if any)
  • TRL 6 is a state where a fully functional prototype already exists and is capable of fulfilling all its functions
Partnering strategy: Co-development Collaboration licensing
More information:
Categories: Chemistry
Owner of a technology: Univerzita Pardubice
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