Viscoelasticity of inks for high speeding printing
AssigneeSun Chemical Corporation
InventorsRichard R. Durand, Jr., Saeid Savarmand, Stephen Postle
Life of this patent
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Abstract
An ink for high-speed printing is formulated by controlling the phase angle of the ink to less than 60° at a frequency of 10 Hz when the ratio of the total non-volatiles volume fraction of the ink to the maximum total non-volatiles volume fraction of the ink is a ratio between about 0.40 to about 0.90. An ink for high-speed printing includes one or more resins, one or more colorants, one or more solvents, and one or more additives. The ink can be a flexographic ink, a rotogravure ink, a heatset offset ink, or a publication gravure ink. A print of the ink includes less than 1% of pinholes by area. The ink is applied to a substrate, which moves at a speed of greater than 1200 feet/min.
Claims22
A method of formulating an ink for high-speed printing comprising:
- measuring the phase angle of the ink, and
- controlling the phase angle of the ink to less than 60° at a frequency of 10 Hz when the ratio of the total non-volatiles volume fraction of the ink to the maximum total non-volatiles volume fraction of the ink is a ratio between about 0.40 to about 0.90.
An ink for high-speed printing comprising:
- one or more resins;
- one or more colorants;
- one or more solvents;
- and
- one or more additives,
- wherein the phase angle of the ink is less than 60° at a frequency of 10 Hz, and the phase angle is measured when the ratio of the total non-volatiles volume fraction of the ink to the maximum total non-volatiles volume fraction of the ink is a ratio between about 0.40 to about 0.90.
A method of printing comprising:
- providing an ink, the ink having the phase angle of the ink of less than 60° at a frequency of 10 Hz when the ratio of the total non-volatiles volume fraction of the ink to the maximum total non-volatiles volume fraction of the ink is a ratio between about 0.40 to about 0.90, and
- applying the ink to a substrate, the substrate moving at a speed of greater than 1200 feet/min.
Dependencies are inferred from the claim text.