Ink Jet Recording Head Ink Deposition Suppression
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Solution Overview
Problem
Ink jet recording methods using pigment ink face challenges in achieving good color developability on glossy paper due to ink deposition on the recording head, which affects normal ink ejection.
Innovation Solution
An ink jet recording method involving an aqueous ink with a resin dispersant, specifically a water-soluble acrylic resin with an acid value of 135 mgKOH/g or less, and carbon black pigment with a cumulative 50% particle diameter of 80 nm or less, where the ink is heated and preliminarily ejected to an ink receiving member to suppress ink deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a preliminary ejection operation is performed to prevent clogging and maintain ejection performance, then ejection reliability is improved, but ink deposition on the ink receiving member increases causing adherence to the recording head
Solution Approach 1:
The patent changes the temperature parameter of the ink during preliminary ejection. By heating the ink to a higher temperature before preliminary ejection, the ink's viscosity is reduced and its evaporation rate is increased, allowing the ink to be easily removed from the ink receiving member and preventing adherence to the recording head while maintaining ejection reliability
Solution Approach 2:
The patent implements periodic preliminary ejection operations at specific intervals during the recording process. This periodic action prevents ink accumulation and deposition on the ink receiving member while maintaining consistent ejection performance, resolving the contradiction between performing preliminary ejection and preventing ink deposition
2Stability of the object's composition
If pigment ink is used to achieve water resistance, light resistance and gas resistance, then image durability is improved, but color developability on glossy paper deteriorates
Solution Approach 1:
The patent uses a composite ink formulation combining pigment particles with specific resin dispersants. This composite structure allows the pigment to provide durability (water, light, and gas resistance) while the resin dispersant ensures proper distribution and adhesion on glossy paper surfaces, achieving both image durability and color developability simultaneously
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 enables recording of images with excellent color developability while preventing ink deposition on the recording head, thereby maintaining stable ink ejection properties.
Implementation Method 1
a heating unit configured to heat the aqueous ink to a predetermined temperature
Implementation Method 2
an ejection orifice configured to eject the aqueous ink to a recording medium or an ink receiving member
Data Source
AI summary
Provided is an ink jet recording method capable of recording an image excellent in color developability while suppressing ink deposition. The ink jet recording method includes ejecting an aqueous ink from an ejection orifice of a recording head based on image data to record an image on a recording medium and ejecting the heated ink to an ink receiving member from the ejection orifice based on preliminary ejection data. The aqueous ink contains a pigment and a resin dispersant for dispersing the pigment and satisfies at least one of requirement (1): the resin dispersant is a water-soluble acrylic resin having an acid value of 135 mgKOH/g or less and requirement (2): the aqueous ink further contains a water-soluble acrylic resin having an acid value of 135 mgKOH/g or less. The pigment is carbon black whose cumulative 50% particle size in volume-based particle size distribution is 80 nm or less.