Reusable Shell Disposable Insert Wetness Indicator
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Solution Overview
Problem
Hybrid-type absorbent articles with reusable outer shells and disposable inserts lack effective indicators for correct insertion orientation and liquid saturation, which can lead to inefficient use and increased waste.
Innovation Solution
Incorporating a translucent or transparent wetness indicator in the crotch region of the reusable outer shell or an optical sensor to detect color changes, allowing for visual or automatic indication of saturation and correct positioning of the insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a wetness indicator is added to the insert, then liquid saturation can be indicated, but the insert complexity increases
Solution Approach 1:
The patent applies color change indicators to visually signal liquid saturation levels. The wetness indicator changes color when exposed to moisture, providing clear information about saturation without requiring complex electronic sensors or mechanisms. This resolves the contradiction by using a simple, passive visual indication system that adds minimal complexity while effectively communicating saturation status.
2Extent of automation
If an optical sensor is added to the outer shell, then automatic saturation detection is enabled, but the outer shell complexity and cost increase
Solution Approach 1:
The optical sensor provides automatic feedback about the wetness indicator's color state, enabling saturation detection without manual inspection. The sensor system monitors the indicator and can trigger alerts or notifications, creating a closed-loop feedback system that automates the saturation detection process while maintaining relatively simple hardware architecture.
3Illumination intensity
If the crotch region is made translucent, then the wetness indicator is more visible, but the outer shell material options are limited
Solution Approach 1:
The outer shell is designed with localized translucency only in the crotch region where the wetness indicator is positioned, rather than making the entire shell translucent. This allows the shell to maintain its normal opaque appearance and material properties in non-critical areas, preserving material versatility and manufacturing flexibility while providing the necessary optical access where needed.
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 user convenience by ensuring correct insert placement and providing timely notification of saturation, reducing waste and improving hygiene.
Implementation Method 1
the insert comprises a wetness indicator which changes appearance when contacted with a body exudates
Implementation Method 2
comprises an optical sensor adapted to automatically detect a colour change of said wetness indicator and send a corresponding signal
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A disposable absorbent insert comprising: a liquid permeable topsheet; a liquid impermeable backsheet; and an absorbent core comprising absorbent material therein and being sandwiched between said topsheet and backsheet; wherein the insert comprises a perimeter formed by first and second transverse edges and first and second longitudinal edges connecting the first and second transverse edges; a longitudinal centerline extending substantially parallel to said first and second longitudinal edges and interposed therebetween such to divide said insert into a first longitudinal half between said longitudinal centerline and said first longitudinal edge and a second longitudinal half between said longitudinal centerline and said second longitudinal edge; and a transverse centerline extending substantially parallel to said first and second transverse edges and interposed therebetween such to divide said insert into a first transverse half between said transverse centerline and said first transverse edge and a second transverse half between said transverse centerline and said second transverse edge; wherein the insert comprises a wetness indicator that is viewable from a garment-facing side of the backsheet and wherein said insert is joinable to a re-usable outer shell.