Absorbent Product Liquid Return Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing absorbent products for light incontinence face issues with liquid return to the wearer's skin due to insufficient adhesion between sheet members and inadequate distribution of foaming or superabsorbent material movement obstruction agents, leading to discomfort and potential escape of highly absorbent resin particles.
Innovation Solution
The absorbent product features a liquid-pervious top sheet, a water-repellent back sheet, and two absorbent sheets with extended contact regions to prevent liquid return, where the first absorbent sheet extends beyond the second absorbent sheet with a back-sheet contact region, and the sheets are fixed using embossing or hot-melt adhesives to enhance adhesion and prevent material escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single absorbent sheet is used with foaming agent or superabsorbent material movement obstruction agent applied to cut portions, then particle escape is suppressed, but liquid return to top sheet occurs due to insufficient adhesion and inadequate distribution of the agent
Solution Approach 1:
The absorbent product is divided into multiple absorbent sheets (first and second absorbent sheets) with different functions. The first absorbent sheet focuses on adhesion and liquid distribution, while the second absorbent sheet focuses on particle containment and absorption. This segmentation allows each sheet to optimize its specific function without compromising the other.
Solution Approach 2:
The first absorbent sheet is designed with extended longitudinal ends that contact the back sheet at specific locations, creating localized adhesion zones. The superabsorbent material movement obstruction agent is applied specifically to the cut portions of the first absorbent sheet, concentrating the containment function where it is most needed at the edges.
2Object-affected harmful factors
If foaming agent is applied from above one sheet member, then particle escape is suppressed, but adhesion between sheet members becomes insufficient due to inadequate application between sheets
Solution Approach 1:
The particle containment function is assigned to the first absorbent sheet through application of superabsorbent material movement obstruction agent to its cut portions, while the adhesion function is handled by the extended longitudinal ends of the first absorbent sheet contacting the back sheet. This segmentation allows both functions to be optimized independently.
Solution Approach 2:
The extended longitudinal ends of the first absorbent sheet act as an intermediary element between the top sheet and back sheet, providing both adhesion through contact with the back sheet and particle containment through the applied agent. This intermediary structure resolves the conflict between adhesion and particle containment.
3Reliability
If two absorbent sheets are laminated with extended ends turned toward back sheet, then adhesion is improved, but liquid return occurs as liquid passes through upper layer and returns to top sheet
Solution Approach 1:
The second absorbent sheet is positioned and configured to specifically intercept liquid at the longitudinal ends where it would otherwise return to the top sheet. The extended longitudinal ends of the first absorbent sheet create localized zones where liquid is redirected toward the back sheet, preventing return to the top sheet.
Solution Approach 2:
The second absorbent sheet is positioned in advance to intercept and absorb liquid before it can return to the top sheet. The extended longitudinal ends of the first absorbent sheet are configured to guide liquid toward the back sheet, preemptively preventing the harmful liquid return effect.
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
This configuration effectively suppresses liquid return to the wearer's skin, enhances adhesion between sheet members, and prevents highly absorbent material escape, improving comfort and product integrity.
Implementation Method 1
a first highly absorbent material in particulate or fibrous form that is fixed between the first upper sheet and the first lower sheet
Implementation Method 2
The first absorbent sheet includes... a first highly absorbent material in particulate or fibrous form that is fixed between the first upper sheet and the first lower sheet
Implementation Method 3
a water-repellent or liquid-impervious back sheet
Implementation Method 4
the sheets are fixed using embossing or hot-melt adhesives to enhance adhesion
Implementation Method 5
the sheets are fixed using embossing or hot-melt adhesives to enhance adhesion
Data Source
AI summary
In an absorbent product (1), a first absorbent sheet (22) is disposed between a top sheet (21) and a back sheet (23). A second absorbent sheet (22a) is disposed between the first absorbent sheet (22) and the back sheet (23). The first absorbent sheet (22) includes a first upper sheet (221), a first highly absorbent material (222), and a first lower sheet (223). The first absorbent sheet (22) extends in the longitudinal direction beyond the longitudinal edges of the second absorbent sheet (22a) on both longitudinal sides. On each longitudinal side, an extension (224) of the first absorbent sheet (22) beyond the second absorbent sheet (22a) includes a back-sheet contact region (225) that is spaced in the longitudinal direction from the longitudinal edge of the second absorbent sheet (22a) and that is in contact with the back sheet (23). This configuration suppresses the return of liquid.