Conductorless Wetness Sensor Attachment for Absorbent Articles
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Solution Overview
Problem
Conductive elements in absorbent articles, such as metallic leads, pose challenges during manufacturing and security screening, and there is a need for a signaling system that does not require these elements to indicate wetness without increasing the article's cost or altering its construction.
Innovation Solution
A wetness sensing system that includes a holding fixture and a sensor band with a sensor attached to the outer surface of the absorbent article, using non-conductive materials and a signaling device to detect wetness without conductors within the article, allowing for secure attachment and effective signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductive leads are incorporated into the absorbent article to detect wetness, then wetness detection capability is improved, but manufacturing complexity increases and false positives occur in metal detectors
Solution Approach 1:
The patent removes the conductive leads from the absorbent article itself and places the sensing elements on an external holder that attaches to the article's outer surface. This extraction eliminates the complexity of incorporating conductors into the article during high-speed manufacturing while maintaining wetness detection capability through the external sensor array.
Solution Approach 2:
The patent introduces a holder as an intermediary device that carries the sensing elements and attaches to the absorbent article's outer surface. This mediator allows the sensing system to function without requiring internal conductors, thus avoiding metal detector false positives and simplifying article manufacturing while preserving detection capability.
2Reliability
If conductive leads are used for wetness signaling, then wetness indication is achieved, but the article triggers false positives in security metal detectors
Solution Approach 1:
By extracting the conductive sensing elements from the absorbent article and placing them on an external holder, the patent eliminates the source of metal detector interference while maintaining the article's metal-free status. The holder with its non-conductive construction ensures no false positives occur during security screening.
Solution Approach 2:
The patent employs a disposable holder design that is discarded with the absorbent article after use. This approach allows the use of simple non-conductive sensing elements without concern for long-term durability, eliminating metal detector interference while maintaining reliable wetness indication for the duration of use.
3Ease of operation
If conductive elements are inserted into the absorbent article interior, then circuit closure for signaling is achieved, but integration complexity and cost increase
Solution Approach 1:
The patent extracts the circuit closure function from the article interior and implements it externally through a holder that attaches to the outer surface. The sensing elements on the holder form circuits with the signaling device without requiring insertion into the absorbent article, dramatically simplifying integration while maintaining signaling functionality.
Solution Approach 2:
The patent segments the wetness detection system into separate functional components: the absorbent article, the holder with sensing elements, and the signaling device. This segmentation allows each component to be manufactured and assembled independently, reducing integration complexity and cost while preserving the complete signaling function.
Data Source
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AI summary
A wetness sensing system for use with an absorbent article includes a holding fixture adapted to be attached to the outer surface of the absorbent article by a consumer, the holding fixture including a first attachment arm having an article-facing side including a first attachment material affixed thereto, and a sensor band including a sensor and having an article-facing side including a second attachment material affixed thereto, wherein the second attachment material has an area and is in a proportion of the area to the weight of the system, and wherein the sensor band has a bending stiffness of less than 30 gf cm^2/cm. The system also includes a signaling device coupled to the holding fixture and in electrical communication with the sensor, wherein the system is adapted to sense wetness within the article without the use of conductors within the absorbent article.