Absorbent Article Liquid-Permeable Layer Expansion Control
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Solution Overview
Problem
Existing absorbent articles face challenges in maintaining a shape-stable three-dimensional structure during use while absorbing fluids, as they tend to deform under compressive forces and have inadequate liquid retention and leakage security, especially with viscose foams that are too soft when wet.
Innovation Solution
Incorporating a liquid-permeable material layer that limits the expansion space of the absorbent structure, allowing it to form a shape-stable, stiff element upon wetting, which resists deformation and prevents complete expansion, thereby creating a three-dimensional form adapted to the user's body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent structure is allowed to expand completely on wetting, then the absorption capacity is maximized, but the article loses shape stability and becomes difficult to manufacture and store
Solution Approach 1:
The liquid-permeable material layer is pre-positioned around the absorbent structure in its dry, flat state to define the future expansion space. This preliminary arrangement ensures that when the absorbent structure expands upon wetting, it forms a predetermined three-dimensional shape with shape stability, resolving the contradiction between maximizing absorption capacity and maintaining shape stability.
2Shape
If the absorbent structure is constrained to prevent complete expansion, then shape stability is improved, but the absorption capacity is reduced
Solution Approach 1:
The liquid-permeable material layer changes its physical state from a flat, two-dimensional configuration in the dry state to a three-dimensional expanded form when wetted. This parameter change allows the layer to provide effective volume limitation and shape stability while still permitting sufficient expansion of the absorbent structure to achieve high absorption capacity.
3Shape
If three-dimensional forming members are used to maintain shape, then shape stability is improved, but the manufacturing complexity and storage space requirements increase
Solution Approach 1:
The invention extracts the shape-stabilizing function from separate three-dimensional forming members and integrates it into the liquid-permeable material layer itself. This layer serves dual purposes: limiting expansion volume and providing shape stability through its liquid-permeable properties, thereby eliminating the need for additional complex forming components and simplifying manufacturing.
Solution Approach 2:
The liquid-permeable material layer performs multiple functions simultaneously: it acts as an expansion limit, provides shape stability, and maintains manufacturability. This multi-functionality resolves the contradiction by consolidating what would otherwise require separate components into a single integrated element.
4Volume of moving object
If the absorbent article is made flat in dry condition for compact storage, then storage efficiency is improved, but the fit and leakage protection during use are compromised
Solution Approach 1:
The absorbent article utilizes a phase transition from a flat, compressed state during storage to an expanded, three-dimensional form during use. The liquid-permeable material layer enables this transition by controlling the expansion of the absorbent structure upon wetting, ensuring the article achieves its functional three-dimensional shape for effective leakage protection while maintaining compact storage volume.
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 solution enhances the absorbent article's ability to maintain a stable form during use, reduces leakage, and allows for efficient absorption and storage, as the absorbent structure forms raised barriers and maintains shape stability even under compressive forces.
Implementation Method 1
an absorbent structure (106), which has the ability to expand on wetting
Implementation Method 2
the absorbent structure displays a first volume in dry condition and a second volume in completely expanded wet condition, the second volume being greater than the first volume
Implementation Method 3
the liquid-permeable material layer constitutes volume-limiting means for the absorbent structure so that the absorbent structure is prevented from reaching complete expansion on wetting
Implementation Method 4
a liquid-permeable material layer (105), which constitutes volume-limiting means for the absorbent structure (106)
Data Source
AI summary
An absorbent article includes at least one liquid-permeable layer material (105) and an absorbent structure (106), the absorbent structure (106) having the ability to expand on wetting, which entails that the absorbent structure (106) displays a first volume in dry condition and a second volume in completely expanded wet condition, the second volume being greater than the first volume. The liquid-permeable layer material (105) encloses the absorbent structure (106) so that the absorbent structure (106) is prevented from reaching complete expansion during wetting.