Phase Separation Ink Crystallization for Paper Adhesion
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Solution Overview
Problem
Current phase change or solid ink printing processes face challenges in providing improved adherence to paper, image permanence, robustness against mechanical stresses, and optimal surface gloss, especially when applied directly to paper substrates, as they often fail to ensure sufficient durability and ink penetration.
Innovation Solution
A phase separation ink comprising a crystallizable component that crystallizes at a lower temperature and an amorphous component that remains amorphous, allowing for a molten single phase state at the ink jetting temperature, resulting in a crystalline phase that remains on the surface and an amorphous phase that penetrates into the paper coating, enhancing image durability and resistance to mechanical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phase change ink is used, then the ink can be jetted at elevated temperature, but the ink fails to provide sufficient adherence and penetration into paper coating
Solution Approach 1:
The ink is segmented into two distinct phases: a crystalline phase containing colorant that remains on the paper surface, and an amorphous binder phase that penetrates into the paper coating. This segmentation allows each phase to perform its specific function optimally - the crystalline phase provides color and surface adherence while the amorphous phase ensures penetration and durability
Solution Approach 2:
The ink uses a composite material system combining crystallizable components (providing color and surface layer) with amorphous binder components (providing penetration and adhesion). This composite approach enables the ink to simultaneously achieve surface adherence through the crystalline phase and deep penetration through the amorphous phase, resolving the contradiction between adherence and penetration
2Reliability
If the ink penetrates deeply into paper, then image permanence improves, but show-through increases and surface gloss deteriorates
Solution Approach 1:
The ink segments the image-forming components between two phases: the crystalline phase remains on the paper surface to provide gloss and prevent show-through, while the amorphous phase penetrates deeply to provide permanence. This spatial segmentation resolves the contradiction between deep penetration for permanence and surface presence for gloss and show-through prevention
Solution Approach 2:
Different regions of the ink composition are assigned different functions: the crystalline colorant phase is positioned at the surface to provide optical properties (gloss, show-through resistance), while the amorphous binder phase is positioned to penetrate deeply into the paper for mechanical anchoring and permanence. This local quality assignment resolves the multi-objective conflict
3Productivity
If the ink is applied directly to paper, then printing speed improves, but image robustness against mechanical stresses decreases
Solution Approach 1:
The composite ink system combines a crystalline colorant phase with an amorphous binder phase, where the amorphous binder acts as a robust matrix that mechanically anchors the crystalline colorant to the paper. This composite structure provides both direct-to-paper printing capability (maintaining productivity) and enhanced mechanical robustness through the interlocked crystalline-amorphous network
4Reliability
If the crystalline phase penetrates into paper, then adhesion improves, but surface gloss and color intensity deteriorate
Solution Approach 1:
The ink segments adhesion function and optical function into separate phases: the amorphous binder phase penetrates into the paper to provide adhesion, while the crystalline colorant phase remains on the surface to provide gloss and color intensity. This functional segmentation resolves the contradiction between adhesion and optical quality
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 phase separation ink achieves improved adherence, permanence, and robustness by ensuring the crystalline phase provides a protective coating while the amorphous phase penetrates into the paper coating, preventing show-through and enhancing mechanical resistance.
Implementation Method 1
at least one crystallizable component comprising a material that crystallizes as it cools from a first ink jetting temperature to a second temperature that is lower than the ink jetting temperature, wherein the second temperature is sufficient to initiate crystallization of the at least one crystallizable component
Implementation Method 2
wherein the at least one crystallizable component and the at least one amorphous component are in a molten, single phase state at the first ink jetting temperature
Data Source
AI summary
A phase separation ink including at least one crystallizable component that crystallizes as it cools from a first ink jetting temperature to a second lower temperature; at least one amorphous component comprising a material that remains amorphous at the second temperature; an optional colorant; wherein the at least one crystallizable component and the at least one amorphous component are in a molten, single phase state at the first ink jetting temperature; wherein at the second temperature, the phase separation ink comprises a crystalline phase comprising the at least one crystallizable component and an amorphous phase comprising the at least one amorphous component; wherein the amorphous phase of the at least one phase separation ink substantially penetrates into the final image receiving substrate and the crystalline phase of the at least one phase separation ink substantially remains on the surface of the final image receiving substrate.