HP ElectroInk Frequently Asked Questions - Hewlett Packard

More documents

Recommendations

Info

Blue Wool Scale [BWS] Scale Simulates number Rating of days indoors before fading 1 3.75 Very poor 2 6 Poor 3 19 Fair 4 65 Moderate 5 130 Good 6 260 Very good 7 520 Excellent 8 1100 Outstanding 4 How effective is HP ElectroInk’s ability to withstand exposure to light? HP ElectroInk’s ability to withstand exposure to light is measured by utilizing various tests for lightfastness. Lightfastness is a term used to describe the resistance of a material to color change when exposed to sunlight or to artificial light sources. The lightfastness tests employed in order to achieve the results listed below, evaluate the print’s resistance to ultraviolet light by comparing the measure of change that has occurred between an exposed area and an unexposed area. A Xenon Arc lamp is used in these tests since it contains a special gas, xenon, which produces an intense light that accelerates the color fading reaction. Since the Xenon Arc lamp reproduces full-spectrum light (as found in sunlight), it is useful for fade and color change testing of inks and media. Two separate tests of lightfastness are shown below. The first shows results based on a Blue Wool reference scale, while the second shows results based on changes in optical density (determined by the percentage of noticeable fading) and changes to color coordinates (measured by the variation in deltaE*). Lightfastness test1: Blue Wool The lightfastness test was performed using a Xenon Arc UV lamp, under the following standards: • British Standard BS-1006B02 for indoor conditions • ISO 4892-1 Plastics – methods of exposure to laboratory light sources, method B, indoor behind window glass according to colorfastness to light (Xenon Arc) • ISO 105 B02 – colorfastness to light (Xenon Arc) The results are presented on a 1-8 Blue Wool reference scale. 1 2 3 4 Blue Wool test results Type Acrylic Coated SBR Coated Gloss SBR Coated Gloss SBR Coated Matte SBR Coated Matte Uncoated Acrylic coated SBR Coated Gloss Please note that different paper brands and types may present deviations from the presented test results Lightfastness test2: Changes in optical density and in color coordinates This lightfastness test was performed according to a procedure specified by the Wilhelm Research Institute (www.wilhelm-research.com) by exposing test samples under an Atlas Suntest Tabletop Xenon Exposure System, for 3-day cycles while monitoring changes in optical density (%fading) and color coordinates (deltaE*). Each 3-day cycle simulates 6 years’ exposure under the above conditions. 3 cycles of 6 days each, simulates 18 years. The tests were executed using HP ElectroInk technology (Liquid EP), Xerography technology (Dry EP) and Offset inks on various types of paper, intended to simulate a variety of typical substrates. (For a full list of papers used for all the tests described in these FAQs, please refer to page 10). 5 6 7 8 Brand Magnostar Condat Gloss Samarkand Condat Matte Perigord Hadar Top HP ElectroInk 4.0 C 7 6-7 6 6-7 6 6-7 C 5 6 M 2 3 6 2-3 6 5 M 3 2-3 Y 1-2 3 4 3 4 3-4 Offset Ink Y 1 1 K 4-5 4-5 4 4-5 4 3 K 4 4 Testing standard used ISO 4892-1 ISO 4892-2 ISO 105 B02 ISO 4892-2 ISO 105 B02 ISO 105 B03 BS 1006B02 BS 1006B02 The Blue Wool Scale is composed of 8 strips of wool fabric, of different dyeing standards. Their chromatic grades range from 1, indicating very low lightfastness, to 8, indicating very elevated lightfastness. Each standard’s value equals twice the solidity value of the preceding one.
Lightfastness test results Change in color coordinates at 6 days' exposure (12 years' equivalent) Delta E 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 SBR Gloss SBR Gloss SBR Matte SBR Matte Acrylic Coated Acrylic Coated Uncoated Uncoated SBR Gloss SBR Matte Paper types per color HP ElectroInk 4.0 Offset Xerography 1 Xerography 2 Change in in optical density at 6 days' exposure (12 years' equivalent) % Fading 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 -5 -10 SBR Gloss SBR Matte Acrylic Coated Acrylic Coated Uncoated Uncoated Paper types per color HP ElectroInk 4.0 Offset Xerography 1 Xerography 2 SBR Gloss SBR Gloss SBR Matte SBR Matte Acrylic Coated Acrylic Coated Uncoated Uncoated SBR Gloss SBR Gloss SBR Matte SBR Matte Acrylic Coated Acrylic Coated Uncoated Uncoated 5
Page 1 and 2: HP ElectroInk Frequently Asked Ques
Page 3: Change in image density per color,
Page 7 and 8: Adhesion to paper (SBR Coated Gloss
Page 9 and 10: What is the concentration of heavy
Page 11 and 12: Glossary of terms • Abrasion: The

HP ElectroInk Frequently Asked Questions - Hewlett Packard

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?