Absorbent Article Fluid Control for Target-Zone Dryness
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Solution Overview
Problem
Existing personal care absorbent articles, such as diapers and incontinence briefs, often fail to maintain dryness effectively due to limitations in fluid control, leading to consumer dissatisfaction.
Innovation Solution
The absorbent article features a bodyside liner with specific air permeability and hydrophilicity, an acquisition layer with controlled air permeability, and an absorbent core with a high superabsorbent material content, designed to manage fluid intake and retention within a target zone, preventing fluid spread beyond this area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acquisition layer length is increased to match the bodyside liner and absorbent core length, then fluid control coverage is improved, but article size and complexity increase
Solution Approach 1:
The acquisition layer is designed with non-uniform properties: it has higher absorbency and lower air permeability in the target zone (where fluid intake is expected) compared to the non-target zones. This local differentiation allows the acquisition layer to be shorter than the full article length while still providing effective fluid control where needed, resolving the contradiction between fluid control coverage and article size.
2Ease of operation
If the bodyside liner air permeability is increased to improve breathability, then skin comfort is improved, but fluid absorption efficiency may be reduced
Solution Approach 1:
The bodyside liner is designed with a specific air permeability range (13,000-16,500 m3ph/m2) that balances breathability and fluid absorption. Additionally, the liner is treated with surfactants to modify surface tension and improve wetting properties, allowing the liner to remain breathable while maintaining effective fluid transfer to the acquisition layer and absorbent core.
3Reliability
If superabsorbent material content is increased to improve fluid retention, then dryness is improved, but manufacturing cost and material complexity increase
Solution Approach 1:
The absorbent core is formulated with a high superabsorbent material content (50-80% by weight of the matrix), which significantly improves fluid retention and dryness performance. The specific parameter range is optimized to balance performance with manufacturing feasibility and cost, resolving the contradiction between fluid retention and material complexity.
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 enhances dryness by reducing rewet to less than 0.3 g, providing improved comfort and wearability by maintaining the skin dryness without increasing the article's size.
Implementation Method 1
the bodyside liner may be configured such that an air permeability of the bodyside liner is no less than thirteen thousand cubic meters per hour per square meter surface (13,000 m3ph/m2) and no greater than sixteen thousand, five hundred cubic meters per hour per square meter surface (16,500 m3ph/m2)
Implementation Method 2
the bodyside liner may be treated with a surfactant to provide a desired degree of wettability and hydrophilicity
Implementation Method 3
the bodyside liner may be treated with a surfactant to provide a desired degree of wettability and hydrophilicity
Implementation Method 4
The acquisition layer may have an air permeability no less than twelve thousand, seven hundred cubic meters per hour per square meter surface (12,700 m3ph/m2)
Implementation Method 5
The absorbent core may include superabsorbent material at no less than fifty percent (50%) by weight of a matrix of cellulosic fluff and superabsorbent material
Data Source
AI summary
An absorbent article includes a bodyside liner, an absorbent core, and an acquisition layer positioned between the bodyside liner and the absorbent core. Properties of the bodyside liner, absorbent core, and acquisition layer may facilitate fluid flow within a target zone and provide the absorbent article with desired dryness.