Sanitary Napkin Protrusion Structure for Fluid Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Absorbent articles with highly water-absorbent polymers between layers struggle with slow water absorption speed and fluid diffusibility, leading to potential leakage when large amounts of body fluid are discharged.
Innovation Solution
The absorbent article features a structure with upper and lower layer sheets where the upper layer has first and second protrusions with varying volumes of highly water-absorbent polymer, arranged alternately in a grid pattern, allowing for improved fluid diffusion and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a highly water-absorbent polymer is disposed between two layers of sheets to reduce thickness, then the product thickness is reduced, but the water absorption speed becomes slow and fluid diffusibility is poor
Solution Approach 1:
The upper layer sheet is divided into multiple protrusions with different heights, creating first space parts and second space parts with different volumes. This segmentation allows the highly water-absorbent polymer to be distributed in a graduated manner, with larger volumes in first space parts for rapid absorption and smaller volumes in second space parts for sustained absorption, thereby improving water absorption speed while maintaining reduced thickness.
Solution Approach 2:
Different regions of the upper layer sheet are given different local qualities through the protrusion structure. The first protrusions with larger volumes provide high absorption capacity zones, while the second protrusions with smaller volumes provide rapid diffusion zones. This local differentiation optimizes both water absorption speed and fluid diffusibility within the constrained thickness.
2Length of stationary object
If a highly water-absorbent polymer is disposed between two layers of sheets to reduce thickness, then the product thickness is reduced, but the fluid diffusibility becomes poor
Solution Approach 1:
The upper layer sheet is segmented into multiple protrusions of varying heights, creating first space parts and second space parts with different volumes. This segmentation establishes fluid diffusion pathways through the graduated structure, allowing body fluid to move efficiently from the surface through the different volume zones to the lower layer sheet, thereby improving fluid diffusibility while maintaining reduced thickness.
Solution Approach 2:
The invention introduces vertical dimensionality variation through protrusions of different heights, creating a three-dimensional graduated structure within the thin profile. This dimensional approach allows fluid to diffuse through multiple levels and volumes of polymer material, enhancing diffusibility without increasing overall product thickness.
3Quantity of substance
If a large amount of body fluid is discharged at once, then the absorption demand increases, but the body fluid cannot be quickly absorbed and concentrates in a certain point, leading to leakage
Solution Approach 1:
The upper layer sheet is segmented into multiple protrusions with different volumes, creating first space parts with larger volumes and second space parts with smaller volumes. This segmentation distributes the absorption function across multiple zones, allowing large amounts of body fluid to be quickly absorbed and dispersed throughout the structure rather than concentrating in a single point, thereby preventing leakage while handling high absorption demands.
Solution Approach 2:
Different regions are assigned different local absorption capacities through the protrusion volume variation. The first protrusions with larger volumes provide high-capacity absorption zones for bulk fluid uptake, while the second protrusions with smaller volumes provide rapid-response zones for immediate fluid distribution. This local quality differentiation enables the system to handle large fluid discharges effectively with high absorption speed.
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 the diffusibility and quick absorption of body fluids, preventing overflow and leakage by optimizing the distribution and volume of the highly water-absorbent polymer.
Implementation Method 1
a highly water-absorbent polymer interposed between an upper layer sheet and a lower layer sheet
Implementation Method 2
highly water-absorbent polymer interposed between an upper layer sheet and a lower layer sheet
Implementation Method 3
the upper layer sheet has a plurality of first protrusions forming first space parts that are to be filled with the highly water-absorbent polymer and that expand to the skin side, and a plurality of second protrusions forming second space parts, each of which having a smaller volume than each of the first space parts, that are to be filled with the highly water-absorbent polymer
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
[Problem] To improve the diffusibility of body fluid such that the body fluid can be quickly absorbed. [Solution] A sanitary napkin 1 includes an absorbing body 4 with a highly water-absorbent polymer 12 interposed between an upper layer sheet 10 disposed on the skin side and a lower layer sheet 11 disposed on the non-skin side. The upper layer sheet 10 has a plurality of first protrusions 14 forming first space parts 13 that are to be filled with the highly water-absorbent polymer and that expand to the skin side, and a plurality of second protrusions 16 forming second space parts 15, each of which having a smaller volume than each of the first space part 13, that are to be filled with the highly water-absorbent polymer and that expand to the skin side. The weight per unit area of the highly water-absorbent polymer 12 filled into the second space parts 15 is made smaller than the weight per unit area of the highly water-absorbent polymer 12 filled into the first space parts 13.