Absorbent Core Channel Network for Shape Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Absorbent articles for personal hygiene, such as diapers and incontinence products, face challenges in maintaining shape stability and preventing leakage due to the expansion of absorbent cores, which leads to reduced effectiveness and comfort.
Innovation Solution
The design incorporates a channel network within the absorbent core that is substantially free of superabsorbent polymers, featuring perimeter and longitudinal channels connected by lateral channels, which helps maintain structural integrity and prevent fluid leakage by creating reinforcing struts when the core swells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent core is made with superabsorbent polymers to increase absorbent capacity, then the absorbent capacity is improved, but the shape stability deteriorates due to expansion and sagging
Solution Approach 1:
The absorbent core is segmented into multiple functional zones including a first core portion with higher SAP content for high absorbency, a second core portion with lower SAP content for structural support, and channel portions that create a network throughout the core. This segmentation allows different regions to serve different purposes - some for maximum absorption and others for maintaining shape stability.
Solution Approach 2:
Different regions of the absorbent core are given different local properties: the first core portion has high SAP content (70-90 wt%) for maximum absorbency, while the second core portion has lower SAP content (10-30 wt%) for structural integrity. The channel portions have even lower SAP content (0-10 wt%) to maintain open pathways. This local differentiation resolves the contradiction between overall absorbent capacity and local shape stability.
2Quantity of substance
If the absorbent core expands to absorb large quantities of liquid, then the absorbent capacity is improved, but the barrier leg cuffs lose contact with the wearer's skin leading to leakage
Solution Approach 1:
The channel network is pre-formed within the absorbent core before use, creating a structural framework that anticipates and prevents the sagging problem. These channels, containing minimal or no SAP, maintain their shape even when surrounding areas expand, thereby preliminarily establishing pathways that will remain open during liquid absorption and prevent barrier cuff detachment.
Solution Approach 2:
The absorbent core uses a composite structure combining high-SAP regions for absorption with low-SAP or SAP-free channel regions for structural stability. This composite approach allows the core to simultaneously achieve high liquid absorption capacity while maintaining the shape stability needed to keep barrier leg cuffs in contact with the wearer's skin.
3Shape
If traditional Adult Incontinence products are made thick and bulky to maintain shape stability, then the shape stability is improved, but the product becomes noticeable and uncomfortable to wear
Solution Approach 1:
The invention changes the SAP content parameter across different regions of the core, creating a gradient from high SAP content in the first core portion to low or zero SAP content in the channel portions. This parameter variation allows the core to achieve shape stability through structural design rather than uniform thickness, enabling a thinner overall profile that is more comfortable and less noticeable during wear.
4Ease of operation
If the absorbent core is made thin and flexible to improve wearability, then the wearability is improved, but the structural properties are reduced compromising shape stability
Solution Approach 1:
The core is divided into multiple functional segments including first and second core portions with different SAP contents and channel portions with minimal SAP. This segmentation creates a distributed structural network where channels act as reinforcing elements, allowing the overall core to be thinner and more flexible while maintaining structural integrity through the engineered distribution of absorbent material.
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 absorbent article's ability to recover from deformation and maintain area coverage, improving leakage prevention and user comfort by resisting compression forces and maintaining shape stability.
Implementation Method 1
The function of the absorbent core is to absorb and retain the exudates for a prolonged amount of time
Implementation Method 2
The majority of currently marketed absorbent articles comprise as absorbent material which is a blend of comminuted wood pulp with superabsorbent polymers (SAP) in particulate form
Implementation Method 3
The design incorporates a channel network within the absorbent core that is substantially free of superabsorbent polymers, featuring perimeter and longitudinal channels connected by lateral channels, which helps maintain structural integrity and prevent fluid leakage by creating reinforcing struts when the core swells
Implementation Method 4
Usually, each leg cuff comprises one or more elastic strings or elements comprised in the chassis of the diaper, for example, between the topsheet and backsheet in the area of the leg openings to provide an effective seal
Data Source
AI summary
The present disclosure is directed, in part, to an absorbent article having a front waist edge, a rear waist edge longitudinally opposing the front waist edge, a longitudinal axis extending from a midpoint of the front waist edge to a midpoint of the rear waist edge, a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core disposed at least partially intermediate the topsheet and the backsheet. The absorbent core having superabsorbent polymers and a channel network substantially free of the superabsorbent polymers. The channel network having a perimeter channel, a first longitudinal channel inboard of the perimeter channel, a second longitudinal channel inboard of the perimeter channel, and one or more connecting lateral channels. The one or more connecting lateral channels connect one of the first longitudinal channel to the second longitudinal channel or the perimeter channel to the perimeter channel.