Ink Jet Protective Layer Resin Film Formation Adhesion
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Solution Overview
Problem
Ink jet recording methods on media with low absorbency or non-absorbency to ink face challenges in achieving sufficient scratch resistance and adhesion due to rapid drying, which decreases fluidity and adhesion of resin components.
Innovation Solution
An ink jet recording method involving layer forming with a clear ink composition containing resin particles, where a protective layer is formed by heating the recording surface at or above the glass transition temperature of the resin particles, followed by controlled drying to ensure twice the heating time, and using a combination of first and second resin particles with different glass transition temperatures for enhanced adhesion and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid drying is performed on images recorded on low absorbency or non-absorbency recording media, then drying efficiency is improved, but fluidity of resin components decreases and adhesion and scratch resistance deteriorate
Solution Approach 1:
The drying process is divided into two distinct stages: a first drying stage performed at a first temperature to maintain resin fluidity and adhesion, and a second drying stage performed at a second temperature to complete drying. This segmentation allows each stage to optimize for its specific function, resolving the contradiction between drying efficiency and adhesion quality.
Solution Approach 2:
The invention changes the temperature parameter during the drying process. By performing drying at a first temperature (maintaining resin fluidity) and then at a second temperature (completing drying), the process adapts parameters to achieve both good adhesion and high drying efficiency, rather than using a single fixed temperature.
2Reliability
If heating is performed at glass transition temperature or more of resin particles, then resin film formation is promoted and adhesion is improved, but drying time must be extended to maintain fluidity
Solution Approach 1:
The heating and drying process is segmented into a first heating stage at a first temperature to promote resin film formation and adhesion, followed by a second drying stage at a second temperature to complete drying. This segmentation allows the process to achieve good adhesion while controlling total drying time through optimized temperature stages.
Solution Approach 2:
The invention uses parameter changes by switching between a first temperature (for resin film formation and adhesion) and a second temperature (for completing drying). This dynamic parameter adjustment resolves the time-adhesion contradiction by optimizing each stage for its specific objective.
3Ease of manufacture
If a single type of resin particles is used, then formulation is simplified, but both adhesion and scratch resistance cannot be simultaneously optimized
Solution Approach 1:
The invention uses a composite resin system comprising two types of resin particles with different glass transition temperatures. The first resin particles (higher Tg) provide scratch resistance, while the second resin particles (lower Tg) provide adhesion. This composite approach simultaneously optimizes both properties that cannot be achieved with a single resin type.
Solution Approach 2:
The invention applies local quality by having different resin particles perform different functions: one type optimized for adhesion (lower Tg) and another type optimized for scratch resistance (higher Tg). Each resin type contributes its specific property to the overall coating performance, allowing simultaneous optimization of multiple 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 achieves images with excellent scratch resistance and adhesion by promoting resin film formation and interlayer adhesion, addressing the limitations of rapid drying in existing methods.
Implementation Method 1
heating and drying which includes first heating which heats the recording surface at a glass transition temperature or more of the resin particles
Implementation Method 2
first drying which performs ventilation while heating the recording surface at a heating temperature or less of the recording surface in the first heating
Data Source
AI summary
An ink jet recording method includes layer forming which includes image recording which records an image by discharging an ink composition which contains water and coloring materials on a recording surface of a recording medium having low absorbency or non-absorbency to ink, and protective layer forming which forms a protective layer on the image by discharging a clear ink composition which contains resin particles and substantially does not contain a coloring material; and heating and drying which includes first heating which heats the recording surface at a glass transition temperature or more of the resin particles after the layer forming, and first drying which performs ventilation while heating the recording surface at a heating temperature or less of the recording surface in the first heating after the first heating, in which the drying time in the first drying is two times or more the heating time in the first heating.