Photochromic Ink Graphics for Absorbent Articles
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Solution Overview
Problem
Disposable absorbent articles lack innovative appearing graphics that can be effectively visible in sunlight, limiting their utility and appeal, especially in outdoor use.
Innovation Solution
Incorporation of a photochromic ink composition on the backsheet of absorbent articles that becomes visible to the naked eye upon exposure to ultraviolet light, providing a unique and engaging visual effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional graphics are printed on the backsheet, then the graphics are visible while the product is being worn, but the graphics lack engagement and appeal in sunlight conditions
Solution Approach 1:
The patent applies photochromic ink composition that changes color or transparency when exposed to ultraviolet light. The graphic transitions from an invisible or faded state under indoor lighting to a vibrant, visible state when exposed to sunlight, thereby adapting to different environmental lighting conditions and maintaining appeal outdoors.
Solution Approach 2:
The photochromic ink composition undergoes parameter changes in its optical properties (absorption spectra) when exposed to ultraviolet radiation. The chemical composition of the ink changes state, transforming from a non-visible to a visible state, enabling the graphic to adapt to sunlight conditions without complex manufacturing processes.
2Illumination intensity
If photochromic ink composition is used, then the graphic becomes visible in sunlight, but the graphic may not be visible under indoor lighting conditions
Solution Approach 1:
The graphic dynamically adjusts its visibility based on the lighting environment. Under indoor lighting, the photochromic ink remains in its non-visible state, allowing the backsheet to appear clean and simple. When exposed to sunlight, the ink activates and becomes visible, providing engagement and appeal. This dynamic behavior resolves the contradiction by making visibility context-dependent rather than fixed.
Solution Approach 2:
The photochromic ink composition exhibits reversible color changes in response to ultraviolet light exposure. The graphic transitions between visible and invisible states based on the presence or absence of UV radiation, allowing it to be invisible under indoor lighting but visible under sunlight, thereby adapting to different illumination conditions.
3Stability of the object's composition
If permanent graphics are used, then the graphics remain unchanged, but the graphics lack interactivity and engagement
Solution Approach 1:
The graphic transitions from a static, permanent appearance to a dynamic, interactive system. The photochromic ink remains stable under indoor conditions but activates in response to UV light exposure, creating an interactive experience that engages users. This dynamic behavior maintains stability during normal use while providing interactivity when exposed to sunlight.
Solution Approach 2:
The photochromic ink undergoes phase transitions between different chemical states in response to ultraviolet radiation. The graphic alternates between a stable, non-visible state under indoor lighting and an active, visible state under sunlight, creating a reversible transformation that provides both consistency and interactivity.
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
Enhances the visibility and appeal of absorbent articles, particularly in sunlight conditions, making them more engaging and useful for outdoor use, such as swimwear diapers, while maintaining functionality.
Implementation Method 1
a graphic disposed on a surface of a backsheet wherein said graphic comprises a photochromic ink composition that becomes visible to the naked human eye upon exposure to ultraviolet light
Data Source
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AI summary
A disposable absorbent article comprising: a) a liquid pervious topsheet; b) a backsheet that is at least partially joined to the topsheet; c) an absorbent core disposed at least partially between the topsheet and the backsheet; d) a first cuff along a longitudinal edge of the topsheet; and e) a graphic disposed on a surface of said topsheet or backsheet wherein said graphic comprises a photochromic ink composition that becomes visible to the naked human eye upon exposure to ultraviolet light.