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Gray inks for ink-jet printing

A technology of inkjet printing and ink, applied in the direction of ink, printing, application, etc., can solve the problems of high ink, loss of dark area details, outflow, etc.

Inactive Publication Date: 2006-05-31
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drawing other colored inks like this usually results in high ink bleed on their medium, which can lead to loss of detail in dark areas

Method used

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  • Gray inks for ink-jet printing
  • Gray inks for ink-jet printing
  • Gray inks for ink-jet printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] ink set

Embodiment 2

[0083] CmpK 6-ink (CMYcmK), CmpK 8-ink (CMYcmgGz), SkinTones 6-ink (CMYcmK) and Skin Tones 8-ink (CMYcmgGz) were printed on HPPremium Plus Glossy Media at 35°C and 80% relative humidity Wet hue shift was measured after 4 days. Such as figure 1 As shown, the Y-axis is Delta E CIE94 1:1:1 and the X-axis is the % ink limit value (1 is 100% ink limit value) plotted, showing curves 110 (SkinTones 6-ink), 111 (Skin Tones 8-ink), 112 (CmpK 6-ink) and 113 (CmpK 8-ink). Delta E uses the CIE94 method to measure color difference. This is a technique that simulates how human vision responds to light reflected from a smooth surface. A Delta E approximates the smallest color difference that a human can distinguish under good to ideal lighting conditions. Therefore, a change below 2 units means that color difference is difficult to perceive. This figure shows that the gray ink of the present invention prints the neutral zone (CmpK 8-ink) and the skin tone (Skin Tones 8-ink) compared to ...

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PUM

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Abstract

A gray ink for ink-jet printing, comprising an ink vehicle; and at least one black dye selected from the group consisting of pacified Reactive Black 31, Formula I, and Direct Blue 199 TMA; and at least one yellow dye selected from the group consisting of AY23, Y104 and Y1189. Magenta and cyan dyes can also be used with the black and yellow dyes in the gray ink.

Description

technical field [0001] The present invention relates to gray inks for inkjet printing. The gray inks printed as a set are the light gray, medium gray and dark gray inks which are obtained by mixing black colorant with the appropriate colorant to give a neutral gray scale slope when printed. Background technique [0002] The benefits of using different shades of gray to produce the color base of inkjet printed color images are known. By the same token, to produce an inkjet printed black and white (grayscale) image, several different shades of gray ink are required. Typically one of two approaches is taken to produce such gray inks. They can be produced by diluting a black ink that causes a hue shift when diluted. On the medium, gray can also be obtained by painting other colors (magenta, cyan, yellow) to achieve the desired hue. Drawing other colored inks like this usually results in high ink bleed on their medium, which can lead to loss of detail in dark areas. In a 3-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/00B41J2/21C09D11/02
CPCB41J2/2114C09D11/40
Inventor L·J·罗利
Owner HEWLETT PACKARD DEV CO LP
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