Porous Transparent Sheet for Inkjet Printed Material Water Resistance
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Solution Overview
Problem
Ink jet printed materials face issues with water resistance, as the color material receiving layer absorbs moisture, leading to fissuring of the transparent sheet when immersed in water, due to the concentration of stress during moisture vaporization and contraction.
Innovation Solution
The introduction of pores in the transparent sheet allows moisture to be discharged through the surface, dispersing the stress and preventing fissuring, while the color material receiving layer is designed with inorganic particulates and a water-soluble resin to maintain image quality and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the color material receiving layer is designed to absorb a large amount of ink to achieve sufficient image density, then the image quality is improved, but the layer becomes thick and absorbs excessive moisture during immersion, leading to fissuring of the transparent sheet
Solution Approach 1:
The transparent sheet is designed with a porous structure containing numerous pores that allow moisture to escape from the color material receiving layer during immersion. This prevents excessive moisture accumulation that would cause fissuring, while allowing the color material receiving layer to maintain sufficient thickness for good image density
Solution Approach 2:
The harmful moisture that accumulates in the color material receiving layer during immersion is extracted through the pores in the transparent sheet. This removes the harmful factor (excessive moisture) that causes fissuring while preserving the necessary moisture absorption capacity for image formation
2Strength
If the transparent sheet is made thicker and stronger to prevent fissuring, then the water resistance is improved, but the stress concentration during moisture vaporization still causes cracking
Solution Approach 1:
The transparent sheet incorporates a porous structure that enables controlled moisture escape pathways. This allows the sheet to maintain adequate strength while preventing stress concentration that leads to cracking, as moisture can gradually escape through the numerous pores rather than building up pressure
3Reliability
If the color material receiving layer is made thinner to improve water resistance, then the water absorption is reduced, but the image density becomes insufficient
Solution Approach 1:
The porous transparent sheet allows the color material receiving layer to maintain optimal thickness for image density while providing escape routes for excess moisture during immersion. The pores enable the system to achieve both sufficient layer thickness for good imaging and adequate water resistance
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 prevents fissuring of the transparent sheet during immersion tests and maintains the water resistance and image quality of printed materials, such as credit cards, by allowing moisture to vaporize evenly and reducing stress concentration.
Implementation Method 1
moisture in the color material receiving layer can vaporize through the pores
Implementation Method 2
pores are formed at least in the transparent sheet (52)
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
A transfer material (1), a printed material (73), and a manufacturing apparatus and a manufacturing method for the printed material are provided in which water resistance of the printed material (73) can be enhanced. A protective sheet (52) contains polyvinyl alcohol with an average degree of polymerization of 1,500 to 5,000.