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Smear Resistance Jet Ink

IP.com Disclosure Number: IPCOM000080279D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Edds, KE: AUTHOR [+2]

Abstract

To overcome the smear of ink deposited by ink jet printing apparatuses when the printed copy passes under feed rolls shortly after printing, it is necessary that the ink be dried prior to contact with the rolls.

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This is the abbreviated version, containing approximately 100% of the total text.

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Smear Resistance Jet Ink

To overcome the smear of ink deposited by ink jet printing apparatuses when the printed copy passes under feed rolls shortly after printing, it is necessary that the ink be dried prior to contact with the rolls.

To accomplish the fast drying for high-speed printing, it is necessary to enhance the dryability of the ink. The drying mechanism of the ink is a combination of evaporation at the air-ink surface and a penetration of the liquid carrier of the ink into the paper structure, where the paper structure acts as a blotter or absorber.

To enhance the absorption of the ink into the paper, a jet ink with 2 to 4% water soluble dye, 2 to 10% glycols and up to 4% of n-methyl-2-pyrolidone is carried in a carrier liquid of 15 to 50% methyl or ethyl alcohol or acetone, combined with the balance of water.

The alcohol or acetone has a penetrating effect on the paper and it dissipates the water/alcohol or water/acetone azeotrope into the paper fibers, thus reducing the amount of liquid required to be evaporated at the air-ink interface. The alcohol or acetone also enhances the evaporation rate, and thus increases the drying at the air-ink interface for a substantially reduced drying time for jet deposited inks.

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