Absorber Joining Region Shear Force Resistance
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Solution Overview
Problem
Absorbent bodies with superabsorbent polymers in absorbent articles face deformation and breaking due to shear forces when swollen, as the primary and secondary absorbent layers move in different directions, leading to potential structural failure.
Innovation Solution
An absorbent body design with a first and second absorbent layer and an intermediate layer, where the layers are laminated in the thickness direction, and the intermediate layer includes communication holes to enhance the joining of the layers through adhesive agents, forming a joined region that withstands shear forces by ensuring the first and second base materials are strongly joined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the absorbent body uses a simple layered structure without intermediate joining, then the manufacturing process is simple, but the absorbent body breaks or deforms under shear force when swollen
Solution Approach 1:
The absorbent body is divided into multiple absorbent layers (first absorbent layer, second absorbent layer, etc.) separated by intermediate layers. Each layer can independently absorb and swell, but the intermediate layers with communication holes maintain structural connection, preventing simultaneous deformation in different directions and reducing shear force concentration.
Solution Approach 2:
An intermediate layer is introduced between adjacent absorbent layers. This intermediate layer contains communication holes that allow adhesive agents to penetrate and join the base materials of different absorbent layers, creating a reinforced joint region that resists shear forces while allowing the layers to swell independently.
2Stability of the object's composition
If the absorbent layers are strongly joined to prevent slipping, then structural integrity is improved, but the absorption performance may be reduced
Solution Approach 1:
The intermediate layer has different properties in different regions: it contains communication holes in specific areas to allow adhesive penetration and create strong joints, while maintaining overall porosity and thickness to preserve absorption performance. The adhesive agents are concentrated at the communication hole regions, creating localized strengthening without compromising global absorption capability.
Solution Approach 2:
The intermediate layer is designed with communication holes (porous structure) that serve dual functions: they allow adhesive agents to penetrate through and bond adjacent absorbent layers strongly, while simultaneously maintaining fluid flow paths that support the absorption performance of the overall structure.
3Shape
If the absorbent body is designed with multiple absorbent layers, then the gel blocking phenomenon is prevented and thinning is achieved, but the shear force increases when layers swell in different directions
Solution Approach 1:
Multiple absorbent layers are combined through the intermediate layer with communication holes that allow adhesive agents to penetrate and join them. This merging creates a unified structure where the base materials of different layers are strongly bonded, preventing relative slipping and reducing shear force accumulation even when the layers swell in different directions.
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 design effectively suppresses breaking and deformation by distributing shear forces across the joined region, maintaining structural integrity even when the absorbent body is swollen and thickened.
Implementation Method 1
a first adhesive agent which is positioned in at least one of a surface on an intermediate layer side of the first base material and a surface on a first base material side of the intermediate layer, and fixes the first absorbent material, and a second adhesive agent which is positioned in at least one of a surface on an intermediate layer side of the second base material and a surface on a second base material side of the intermediate layer, and fixes the second absorbent material
Implementation Method 2
the superabsorbent polymers absorb the excrement (for example : urine) of the wearer and swell
Data Source
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AI summary
Provided is an absorber capable of suppressing ruptures and shape-collapse caused by shear stress. This absorber (3) comprises a first absorbing layer (11), a middle layer (13), and a second absorbing layer (12). The first absorbing layer comprises a first base material (21), a first water-absorbing material (23) containing a highly water-absorbing polymer, and first adhesives (22/24) for securing the first water-absorbing material. The second absorbing layer comprises a second base material (26), a second water-absorbing material (28) containing a highly water-absorbing polymer, and second adhesives (27/29) for securing the second water-absorbing material. In a planar view, the absorber has a joining region (7) wherein the first base material and the middle layer, through the first adhesives, and, the second base material and the middle layer, through the second adhesives, respectively, are joined to one another in the thickness direction. In the joining region, the first adhesives and the second adhesives contact each other, joining the first base material and the second base material to one another.