Sanitary Napkin Absorbent Core with 3D Rear Zone
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Solution Overview
Problem
Women with heavy menstrual bleeding face challenges with existing sanitary napkins, as they often experience excessive fluid flow that can lead to skin and garment soiling, discomfort, and psychological insecurity, particularly when sitting, due to the rearward flow of menstrual fluid.
Innovation Solution
A sanitary napkin design featuring a main absorbent core with two 3-dimensional absorbent members and a liquid-pervious top sheet and liquid-impermeable back sheet, providing enhanced absorption and containment of heavy menstrual fluid flow, with bifurcated wings and garment adhesives for secure attachment to prevent rearward flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard sanitary napkin is used, then the structure is simple and comfortable, but it cannot handle heavy menstrual fluid flow and causes skin and garment soiling
Solution Approach 1:
The absorbent core is segmented into multiple zones with different heights and functions. The front portion has a first height, the rear portion has a second height greater than the first, and there are lateral absorbent portions extending between them. This segmentation allows each zone to handle specific fluid flow patterns, with the rear higher portion capturing rearward flow during sitting and the lateral portions preventing side leakage, thereby improving reliability without excessive complexity.
Solution Approach 2:
The patent introduces a vertical dimension variation through the different heights of the rear versus front absorbent portions. The rear absorbent portion extends higher vertically than the front portion, creating a three-dimensional structure that actively manages rearward fluid flow. This dimensional change allows the napkin to address multiple fluid flow directions simultaneously, improving protection against leakage while maintaining a manageable structural complexity.
2Reliability
If extra protection measures are taken (double napkins, pull-ups, diapers), then fluid leakage is prevented, but comfort is reduced and psychological security is compromised due to visible bulk
Solution Approach 1:
The sanitary napkin applies local quality by providing enhanced absorbent height specifically in the rear portion where fluid leakage is most problematic during sitting. The front portion maintains a lower, more comfortable profile. This localized enhancement of the rear absorbent portion to a greater height provides targeted protection exactly where needed, preventing the need for double napkins or bulky pull-ups while maintaining comfort and discretion in the front area.
3Reliability
If the absorbent core is extended to the back lateral end, then rearward fluid flow is absorbed, but the napkin becomes bulkier and less comfortable
Solution Approach 1:
The patent implements local quality by extending the absorbent core to the back lateral end only in the rear portion, where it is needed to capture rearward fluid flow during sitting. The front portion maintains a more compact profile for comfort. This localized extension provides targeted rearward flow protection without creating excessive bulk across the entire napkin, balancing reliability and comfort.
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 design effectively absorbs and contains heavy menstrual fluid, reducing skin and garment contact, providing comfort and psychological security by minimizing fluid leakage and soiling, thus addressing the specific needs of women with heavy menstrual bleeding.
Implementation Method 1
A main absorbent is positioned between the top sheet and the back sheet. The main absorbent contains a superabsorbent... The first 3-dimensional absorbent member contains a superabsorbent. The second 3-dimensional absorbent member also contains a superabsorbent.
Implementation Method 2
A liquid pervious top sheet having a body-facing surface...
Implementation Method 3
a liquid-impermeable back sheet having a garment-facing surface
Implementation Method 4
A first garment adhesive is secured to the garment-facing surface of the sanitary napkin. The first garment adhesive releasable attaches the sanitary napkin to an interior surface of a crotch portion of an undergarment.
Data Source
AI summary
A sanitary napkin is disclosed having a body-facing surface and a garment-facing surface. The sanitary napkin also has a first end, a second end, and a pair of sides. The sanitary napkin has a longitudinal central axis, a transverse central axis, a main absorbent, and first and second 3-dimensional absorbent members. The main absorbent, and the first and second 3-dimensional absorbent members are joined together between a liquid pervious top sheet and a liquid-impervious back sheet. All three absorbents contain superabsorbent. The sanitary napkin also has a pair of wings extending outward from the sides of the sanitary napkin and has garment adhesive on the garment facing surfaces to secure the sanitary napkin and the pair of wings to the crotch portion of an undergarment. This sanitary napkin is designed to absorb heavy to excessive menstrual fluid flow.