Ink Composition Rubbing Resistance High Speed Printing
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Solution Overview
Problem
Conventional image forming methods fail to achieve high rubbing resistance, wide color reproduction range, and high color optical density at high conveying speeds, particularly on form papers used in industrial printing.
Innovation Solution
An image forming method using an ink composition containing a pigment, a compound represented by Formula (1) (an alkylene oxide adduct of glycerol), wax, and water, applied at a conveying speed of 80 m/min or higher, where the compound is present in a range of 5.0 to 40.0 mass % and the wax is in the form of wax particles, providing improved rubbing resistance and color density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous ink is used for inkjet recording, then environmental conservation and jetting stability are improved, but rubbing resistance of the formed image deteriorates
Solution Approach 1:
The invention uses a composite ink composition containing aqueous ink components combined with specific wax particles and alkylene oxide adducts of glycerol. This composite formulation maintains the jetting stability benefits of aqueous ink while adding rubbing resistance through the wax and glycerol derivative components that form a protective film on the paper surface.
Solution Approach 2:
The invention modifies the physical and chemical parameters of the ink composition by incorporating wax particles with specific properties and alkylene oxide adducts of glycerol in controlled amounts. These parameter changes alter the ink's absorption characteristics and surface film formation to simultaneously achieve good jetting stability and enhanced rubbing resistance.
2Productivity
If image is formed at high conveying speed, then productivity is improved, but rubbing resistance of the formed image deteriorates
Solution Approach 1:
The ink composition performs preliminary action by rapidly absorbing into the form paper at high speed while simultaneously forming a protective film through the wax and alkylene oxide adduct components. This preliminary film formation occurs during the absorption process itself, ensuring rubbing resistance is established before the paper is fully conveyed and piled.
Solution Approach 2:
The invention changes the absorption rate and film formation parameters of the ink composition to match high conveying speeds. By adjusting the ink's absorption characteristics and drying kinetics, the system maintains rubbing resistance even when the paper moves through the system at 80 m/min or higher.
3Quantity of substance
If ink is applied to form paper with high absorption amount, then ink penetration is improved, but pigment presence on surface deteriorates
Solution Approach 1:
The alkylene oxide adduct of glycerol acts as an intermediary substance between the ink pigment and the form paper. It facilitates controlled ink penetration while simultaneously acting as a surfactant to keep pigment particles suspended and present on the paper surface, preventing complete penetration and ensuring sufficient pigment remains for quality image formation.
Solution Approach 2:
The invention changes the surface tension and wetting parameters of the ink composition through the addition of alkylene oxide adducts. This modifies how the ink interacts with the highly absorbent form paper, allowing controlled penetration while maintaining pigment presence on the surface through altered capillary action and adhesion characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively enhances rubbing resistance, color reproduction range, and color optical density, even at high conveying speeds, by suppressing ink penetration and maintaining pigment presence on the paper surface, thus preventing image degradation.
Implementation Method 1
the recording medium having an absorption amount of the ink composition, within 20 msec1/2 from a start of contact of the ink composition with the recording medium, of 20 ml/m2 or larger
Implementation Method 2
the ink composition comprising a pigment, a compound represented by the following Formula (1), a wax and water... effectively enhances rubbing resistance... by suppressing ink penetration and maintaining pigment presence on the paper surface
Data Source
AI summary
The invention provides an image forming method including at least applying an ink composition to a recording medium to form an image, the recording medium having an absorption amount of the ink composition, within 20 msec1/2 from a start of contact of the ink composition with the recording medium, of 20 ml/m2 or larger according to the Bristow method and being conveyed in a feed direction at a conveying speed of 80 m/min or higher, and the ink composition containing at least a pigment, a compound represented by the following Formula (1), wax and water. In Formula (1), each of l, m, and n independently represents an integer of 1 or more; the sum of l, m, and n is from 3 to 15; and each AO of (AO)l, (AO)m, and (AO)n independently represents an ethyleneoxy group or a propyleneoxy group.