Fluid-absorbent Articles Using High-Sphericity Polymer Particles

The patent changes the physical parameter of particle sphericity from conventional irregular shapes to highly spherical particles with mean sphericity of at least 0.84. This parameter change fundamentally improves fluid acquisition and distribution performance, directly addressing the rewet value and acquisition time issues while maintaining a relatively simple two-layer structure.

The patent applies spheroidality by requiring fluid-absorbent polymer particles to have a mean sphericity of at least 0.84. This curvature optimization enables better fluid distribution across the absorption layers, improving acquisition time and rewet value through enhanced capillary action and uniform fluid spread.

The patent resolves the time contradiction by changing particle geometry parameters - specifically requiring high sphericity (≥0.84) which optimizes the balance between absorption capacity and acquisition speed. The spherical shape enables faster fluid uptake while maintaining high rewet value through controlled distribution in the upper and core layers.

The patent applies local quality by distributing fluid-absorbent polymer particles at different concentrations in different layers: 10-95% in the core layer and 0-20% in the upper layer. This localized optimization ensures rapid acquisition in the upper layer while maintaining high capacity in the core, resolving the time-reliability trade-off.

The patent resolves the uniformity contradiction through local quality by implementing layer-specific particle concentration ranges: 10-95% in the core layer for high capacity and 0-20% in the upper layer for uniform distribution. This stratified approach maintains overall uniformity while providing localized high absorption capacity where needed.

The patent applies segmentation by dividing the fluid-absorbent article into functionally distinct layers with different particle concentrations. The upper layer (0-20%) handles uniform distribution while the core layer (10-95%) provides high absorption capacity, segmenting the overall function to resolve the uniformity-quantity trade-off.