Layered Absorbent Article Structure for Longitudinal Leak Prevention
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Solution Overview
Problem
Existing absorbent articles, such as disposable diapers, suffer from longitudinal leakage of excrements, particularly when a wearer excretes multiple times, as conventional designs fail to effectively prevent leakage in this direction.
Innovation Solution
The absorbent article is designed with a longitudinal direction corresponding to the front-rear direction of the wearer, featuring a crotch, front, and rear portions, and includes an absorbent assembly with leak-proof cuffs and a layered absorbent member where the second layer has a longitudinal extension in the rear portion, providing enhanced elasticity and absorbent polymer density to prevent longitudinal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stacked absorbent member is used, then cushioning properties are improved, but appearance becomes poor due to bulkiness
Solution Approach 1:
The absorbent member is divided into multiple layers: a first layer (stacked absorbent member with fiber material and absorbent polymer particles for cushioning), a second layer (sheet-type absorbent member with absorbent polymer particles for thin profile), and an intermediate layer. This segmentation allows each layer to contribute different functions, resolving the contradiction between cushioning and appearance.
Solution Approach 2:
The invention uses a composite structure combining stacked absorbent member (fiber material + absorbent polymer) and sheet-type absorbent member (absorbent polymer between sheets). This composite approach allows the product to simultaneously achieve the cushioning properties of stacked members and the thin appearance of sheet-type members.
2Quantity of substance
If conventional absorbent articles are used, then basic absorption is provided, but longitudinal leakage prevention is poor
Solution Approach 1:
The second layer is designed with a longitudinal extension only in the rear portion of the absorbent member, creating local quality differentiation. This extension has higher absorbent polymer density and forms a pocket structure specifically in the rear portion, providing enhanced longitudinal leakage prevention where it is most needed while maintaining overall absorption capacity.
Solution Approach 2:
The second layer extends in the longitudinal direction at the rear portion, creating a three-dimensional pocket structure that protrudes into the crotch portion. This dimensional change creates a reservoir for storing excrements, preventing longitudinal leakage by providing an additional spatial dimension for containment.
3Reliability
If the second layer has a longitudinal extension in the rear portion, then longitudinal leakage prevention is improved, but structural complexity increases
Solution Approach 1:
The absorbent member is segmented into distinct layers with the second layer having a specific longitudinal extension only in the rear portion. This segmentation allows the complex pocket structure to be achieved through layer design rather than complex assembly, reducing manufacturing complexity while maintaining the leakage prevention function.
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 design effectively prevents longitudinal leakage by forming a pocket structure that temporarily stores excrements, ensuring excellent leakage prevention performance and comfort through the use of a flexible second layer with higher absorbent polymer density and elasticity.
Implementation Method 1
an absorbent member to absorb and retain a body fluid
Implementation Method 2
an absorbent member mainly including an absorbent polymer layer
Implementation Method 3
a portion of the leak-proof cuff between the end portion fixing part in the front portion and the end portion fixing part in the rear portion is a stretch portion that is not fixed to other members and has elasticity in the longitudinal direction
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(b)
AI summary
An absorbent member (5) includes a first layer (6) and a second layer (7) placed on the non-skin-facing surface side of the first layer (6) and containing an absorbent polymer (P). The second layer (7) has, in at least one of a front portion (A) and a rear portion (C), a longitudinal extension (7F) extending outward in the longitudinal direction X from a tangent (65L) that extends in the lateral direction (Y), to a longitudinal end (65) of the first layer (6). In at least one of the front portion (A) and the rear portion (C), an end portion fixing part (120) of each leak-proof cuff (12) overlaps with the longitudinal extension (7F) of the second layer (7) in plan view, and the longitudinal end (65) of the first layer (6) is located longitudinally inward from the end portion fixing part (120) and is located a space (S) apart from the end portion fixing part (120). The longitudinal extension (7F) of the second layer (7) has a smaller bending rigidity than the first layer (6) and has a larger density of the absorbent polymer (P) than the first layer (6).