UV print - resistance test


The subject of the study was to check the differences in UV resistance of sublimation and resin printing. Two Octa Optima 3 x 3 m tents with 100% printing were set up for this purpose. The roofs of the tents were made of impregnated polyester fabric of a weight of approximately 200 g/m², customarily used by the MITKO company to manufacture tents and advertising umbrellas. One roof was printed with transfer sublimation technique and the other with resin printing technique.

From 8. 06 to 8. 09. 2021, the tents were subjected to continuous UV exposure. Colour saturation every 30 days was compared to unexposed standards.

As a result of the test, it was found that after 90 days of uninterrupted exposure to sunlight, the Delta E parameter of the dominant black colour for sublimation printing compared to the standard was 26,3. The Delta E of the dominant black colour for the resin print relative to the standard was 3, 5.

The numerical value of the Delta E parameter approximately describes the color difference as follows:
0.0 –1.0 – imperceptible difference (often measurement error)
1.0 – 2.0 – people with high colour sensitivity (women, artists, etc. ) can see the difference
2.0 – 3.0 – noticeable colour difference
3.0 – 6.0 – difference acceptable in digital printing process
6.0 – >> – large colour difference noticeable to most people

The MITKO company recommends the resin printing technique for printing products exposed to permanent and strong UV radiation, especially advertising umbrellas.



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