Superabsorbent Polymer Film for External Dampness Control
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Solution Overview
Problem
Absorbent articles suffer from external dampness due to moisture permeability of the liquid impermeable back sheet, leading to discomfort and skin irritations.
Innovation Solution
A super absorbent polymer film with a thickness of 500 µm or less and moisture absorption of 10 to 100 g/m², integrated between the liquid impermeable back sheet and breathable waterproof film, enhancing moisture absorption and reducing external dampness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional absorbent product uses a large amount of absorbent filler and liquid distribution layer, then liquid absorption capacity is improved, but product thickness increases and discomfort to the wearer occurs
Solution Approach 1:
The patent changes the physical and chemical parameters of the absorbent polymer particles by controlling their granularity distribution (specifically D10, D50, D90 values) and crosslinking degree. This allows the particles to achieve superior absorption performance with smaller sizes, thereby reducing overall product thickness while maintaining or improving liquid absorption capacity.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers with different functions: a top sheet, a thin liquid distribution layer, and a superabsorbent polymer layer. The composite design allows each layer to be optimized independently, achieving high absorption capacity with minimal overall thickness by eliminating redundant materials.
2Length of stationary object
If a conventional absorbent product reduces thickness by removing layers, then comfort is improved, but liquid distribution uniformity deteriorates
Solution Approach 1:
The liquid distribution layer in the patent is designed to perform multiple functions simultaneously: it distributes liquid uniformly across the absorbent polymer particles, prevents particle aggregation, maintains structural integrity, and contributes to overall product thinness. This multi-functional design eliminates the need for separate layers while maintaining liquid distribution uniformity.
Solution Approach 2:
The patent optimizes the local properties of the liquid distribution layer by carefully selecting its thickness (1-5 mm) and composition to match the specific requirements of the absorbent polymer particles. This localized optimization ensures effective liquid distribution without requiring excessive thickness, thereby maintaining product comfort.
3Strength
If superabsorbent polymer particles with high crosslinking are used, then particle strength is improved, but particle hardness increases and liquid wettability deteriorates
Solution Approach 1:
The patent precisely controls the crosslinking degree parameter of the superabsorbent polymer particles to optimize the balance between particle strength and wettability. By maintaining crosslinking within a specific range and controlling particle size distribution, the particles achieve sufficient mechanical strength to maintain structure while retaining adequate surface porosity and hydrophilicity for effective liquid wettability.
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 super absorbent polymer film effectively reduces external dampness, improving the feel and comfort of absorbent articles by minimizing moisture transmission, thereby reducing skin rashes and irritations.
Implementation Method 1
superabsorbent polymer particles which have excellent liquid-absorbing and -retaining properties
Implementation Method 2
superabsorbent polymer particles which have excellent liquid-absorbing and -retaining properties
Implementation Method 3
said liquid distribution layer having an average thickness of not more than 5 mm
Data Source
Figure 1~3
Figure 4
AI summary
The present disclosure relates to a super absorbent polymer film having excellent moisture absorption and to an absorbent article excellent in feeling capable of reducing skin rashes and other irritations generated when warmed by the wearer's body by including the super absorbent polymer film to improve external dampness.