Dual-Layer Recording Medium Ink Absorbency vs Cracking
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Solution Overview
Problem
Recording media used for photo books and albums lack sufficient resistance to cracking by folding, despite requiring high ink absorbency and resistance to cracking after coating.
Innovation Solution
A recording medium with a water-resistant support and two ink-receiving layers, where the first layer contains alumina hydrate and polyvinyl alcohol, and the second layer contains fumed silica and polyvinyl alcohol, with specific mass ratios and thicknesses to enhance adhesion and flexibility, thereby reducing cracking and improving ink absorbency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single ink-receiving layer is used to achieve high ink absorbency, then ink absorbency is improved, but resistance to cracking by folding deteriorates
Solution Approach 1:
The ink-receiving layer is divided into multiple sub-layers (first ink-receiving layer and second ink-receiving layer) with different compositions and functions. The first layer provides ink absorbency while the second layer provides flexibility and crack resistance, resolving the contradiction between ink absorbency and folding resistance through functional segmentation.
Solution Approach 2:
The patent uses composite materials with different properties in each sub-layer. The first layer contains alumina hydrate and polyvinyl alcohol for ink absorption, while the second layer contains fumed silica and polyvinyl alcohol for flexibility. This composite structure allows simultaneous achievement of high ink absorbency and resistance to cracking by folding.
2Quantity of substance
If ink-receiving layers are coated to improve ink absorbency, then ink absorbency is improved, but cracking after coating occurs
Solution Approach 1:
The patent changes the chemical composition parameters of each sub-layer to prevent cracking. The first layer uses alumina hydrate with specific binder ratios for ink absorption, while the second layer uses fumed silica with different binder ratios to provide flexibility and prevent cracking after coating, thus resolving the contradiction through parameter optimization.
3Quantity of substance
If multiple ink-receiving layers are added to improve ink absorbency, then ink absorbency is improved, but device complexity increases
Solution Approach 1:
The patent extracts and separates the different functions (ink absorption and crack resistance) into distinct sub-layers. By taking out the flexibility function into a separate second layer with fumed silica, the structure achieves high ink absorbency through multiple layers while maintaining relatively simple construction with clearly defined functional zones.
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 solution effectively inhibits cracking by folding and after coating, while maintaining high ink absorbency and optical density, as demonstrated by the evaluation of various recording media compositions.
Implementation Method 1
a first ink-receiving layer, in that order. The first ink-receiving layer contains alumina hydrate and polyvinyl alcohol, and the second ink-receiving layer contains fumed silica and polyvinyl alcohol
Data Source
AI summary
A recording medium includes, in sequence, a support, a first ink-receiving layer, and a second ink-receiving layer, in which the first ink-receiving layer contains at least one selected from an alumina, an alumina hydrate, and a fumed silica, a polyvinyl alcohol, and a boric acid, in which a mass ratio of a content of the boric acid in the first ink-receiving layer to a content of the polyvinyl alcohol in the first ink-receiving layer is 2.0% by mass or more and 7.0% by mass or less, in which the second ink-receiving layer contains a fumed silica, a polyvinyl alcohol, and a boric acid, and in which a mass ratio of a content of the boric acid in the second ink-receiving layer to a content of the polyvinyl alcohol in the second ink-receiving layer is 10.0% by mass or more and 30.0% by mass or less.