Absorbent Article Dual Core Leakage Prevention
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Solution Overview
Problem
Absorbent articles, such as urine pads and diapers, face challenges with urine leakage and reduced absorption capacity due to deformation and loss of hydrophilic properties in non-woven cloths, especially after multiple uses.
Innovation Solution
The design includes a lower and upper absorbing core with liquid-permeable core-wrapping sheets and liquid-holding materials like cellulose fibers, with exposed portions for direct connection and adhesive bonding to prevent deformation and enhance urine flow, using hydrophilic long-fibered non-woven cloth to maintain absorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the entire liquid-holding material is covered with a non-woven cloth formed of a synthetic fiber, then the structural integrity and prevention of twisting is improved, but the hydrophilic properties are lost after multiple uses due to washing away of the hydrophilic agent
Solution Approach 1:
The non-woven cloth coverage is segmented rather than complete. The core-wrapping sheet covers only specific portions of the liquid-holding material (front surface, rear surface, and side surfaces except the connecting area), leaving the connecting area exposed. This segmentation maintains structural integrity where needed while preserving absorption capacity at the connection interface.
Solution Approach 2:
Different regions of the liquid-holding material have different coverage qualities. The core-wrapping sheet provides coverage and structural support at the front and rear surfaces and most side surfaces, while the connecting area remains uncovered to maintain direct contact and absorption efficiency between stacked absorbing cores.
2Quantity of substance
If absorbing cores are stacked in the thickness direction to increase absorption amount, then the total absorption capacity is improved, but twisting and deformation occur during wearing
Solution Approach 1:
Multiple absorbing cores are stacked and merged in the thickness direction to increase total absorption capacity. The core-wrapping sheet binds these stacked cores together, providing structural stability and preventing twisting while maintaining the increased absorption capacity of the multi-core configuration.
Solution Approach 2:
The core-wrapping sheet is applied to the liquid-holding material before stacking, providing pre-formed structural support and twist prevention. This preliminary wrapping ensures that when cores are stacked and subjected to wear forces, the structural integrity is already established and resistant to deformation.
3Object-affected harmful factors
If a second sheet is placed between upper and lower absorbing cores to improve diffusibility, then wetback reduction is achieved, but absorption rate decreases due to urine remaining on the sheet
Solution Approach 1:
The second sheet component is extracted/removed from the absorbing core structure. Instead of placing an additional sheet between cores that would retain urine and reduce absorption rate, the invention uses direct exposure of liquid-holding material at the connecting area to eliminate the intermediate barrier that caused urine retention and reduced productivity.
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 improves the absorption rate and prevents urine leakage by ensuring continuous hydrophilicity and structural integrity during wearer movement, maintaining absorption capacity even after multiple uses.
Implementation Method 1
liquid-holding material including such as cellulose fibers
Implementation Method 2
liquid-holding material including such as cellulose fibers
Implementation Method 3
liquid-permeable core-wrapping sheet
Implementation Method 4
hydrophilic long-fibered non-woven cloth
Data Source
AI summary
An absorbent article has a lower absorbing core and an upper absorbing core. Each absorbing core includes a liquid-holding material and a liquid-permeable core-wrapping sheet. The liquid-holding material is covered by the liquid-permeable core-wrapping sheet, but it also has an exposed portion not covered by the liquid-permeable core-wrapping sheet. The exposed portions of the lower absorbing core and the upper absorbing core face each other and the liquid-holding materials are connected with each other at the exposed portion. Because the liquid-holding material of the upper absorbing core is in direct contact with the liquid-holding material of the lower absorbing core, the area provides a path through which liquid flows smoothly from the upper absorbing core to the lower absorbing core. Also, because the upper and lower liquid-holding materials are covered by the core-wrapping sheets, deformation of the liquid-holding materials is prevented.