Neutralizing Liquid for Ink-Jet Gloss Uniformity
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Solution Overview
Problem
Ink-jet printing methods face challenges in maintaining gloss uniformity due to the interaction between salt ions from the primer and varnish, leading to reduced gloss and increased printing costs.
Innovation Solution
Applying a neutralizing liquid containing a polyanion, such as polystyrene sulfonate, on the printed image before varnish application, which binds cations from the primer, reducing their transfer to the varnish and preventing destabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If salt is added to the primer to destabilize ink and improve image quality, then image quality aspects such as bleeding and gamut are improved, but the salt interacts with and destabilizes the varnish, reducing gloss
Solution Approach 1:
The patent applies a neutralizing liquid between the primer and varnish layers to pre-neutralize salt ions before varnish application. This preliminary action removes the harmful effect of salt on gloss while preserving the beneficial ink destabilization effect, thereby resolving the contradiction between image quality improvement and gloss maintenance
Solution Approach 2:
The neutralizing liquid acts as an intermediary layer between the primer (containing salt) and the varnish. It selectively neutralizes cations from the primer without affecting the varnish stability, allowing both the ink destabilization function and the gloss function to coexist without mutual interference
2Object-affected harmful factors
If the amount of salt in the primer is reduced to prevent interaction with varnish, then gloss is maintained, but image quality aspects become insufficient
Solution Approach 1:
Instead of reducing salt content, the patent applies a neutralizing liquid after primer application but before varnish application. This preliminary neutralization allows full salt content to be used for optimal image quality while preventing gloss reduction, effectively resolving the contradiction without compromising either parameter
3Object-affected harmful factors
If high absorbing substrates or low salt-sensitive varnishes are used to prevent salt interaction, then gloss is maintained, but printing costs increase
Solution Approach 1:
The neutralizing liquid serves as a cost-effective intermediary that enables the use of standard, non-specialized substrates and varnishes. By chemically neutralizing salt ions before they can interact with the varnish, it eliminates the need for expensive specialized materials while maintaining gloss, thereby resolving the contradiction between gloss maintenance and cost reduction
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
This approach maintains high gloss values similar to those without salt, achieves gloss uniformity, and allows for the use of standard inks and varnishes, reducing printing costs.
Implementation Method 1
cations present from the salt of the primer can be at least partly bound by a polyanion, such as polystyrene sulfonate
Data Source
AI summary
In an ink-jet printing method, a neutralizing liquid is applied before a varnish is applied on a printed image to neutralize salt ions in a primer. An ink set and a kit of parts include such a neutralizing liquid and primer.