Absorbent Core Channels and Backsheet Signals
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Solution Overview
Problem
Absorbent core structures with reduced cellulose fiber levels in disposable diapers can become stiffer when loaded with bodily fluids, affecting liquid transport and overall performance, while maintaining aesthetic appeal and functionality is challenging.
Innovation Solution
Incorporating permanent channels free of superabsorbent polymer material within the absorbent core, immobilized using adhesive, to enhance liquid transport and flexibility, along with printed signals on the backsheet to communicate channel presence and benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If superabsorbent polymer material is reduced or eliminated from the absorbent core to make it thinner, then the absorbent core becomes thinner, but the absorbent core becomes stiffer when loaded with bodily fluids
Solution Approach 1:
The absorbent core is segmented into multiple layers with different functions: a first layer with superabsorbent polymer for bulk absorption, and a second layer with channels for liquid transport. This segmentation allows the thin core to maintain both flexibility and absorption capability by distributing functions across layers rather than relying on a single homogeneous structure.
Solution Approach 2:
Different regions of the absorbent core are given different properties: the first layer has high superabsorbent polymer content for absorption, while the second layer has channels with reduced or eliminated superabsorbent polymer for efficient liquid transport. This local differentiation allows the thin core to achieve both flexibility in channel regions and absorption capacity in other regions.
2Volume of moving object
If superabsorbent polymer material is reduced or eliminated from the absorbent core to make it thinner, then the absorbent core becomes thinner, but liquid transport efficiency deteriorates
Solution Approach 1:
Superabsorbent polymer material is extracted from specific regions to create channels in the second layer of the absorbent core. This extraction of material creates dedicated pathways for liquid transport, improving productivity by ensuring rapid liquid movement through the thin core structure without being impeded by absorbent material.
Solution Approach 2:
The channels act as intermediary structures that facilitate liquid transport between the topsheet and the bulk absorbent material. These channels provide a dedicated transport medium that bridges the gap between liquid application points and absorption zones, enabling efficient liquid movement through the thin core.
3Productivity
If channels are created in the absorbent core to improve liquid transport, then liquid transport improves, but the structural integrity and permanence of channels deteriorate when the absorbent material expands
Solution Approach 1:
The channels are formed and positioned in the absorbent core before the absorbent material is applied or before use. This preliminary formation of channels ensures they are established in the correct positions and configurations before any expansion or loading occurs, maintaining their structural integrity and permanence throughout the product lifecycle.
Solution Approach 2:
The absorbent core uses a composite structure combining different materials and layers: a first layer with superabsorbent polymer and a second layer with channels that may have reduced or eliminated superabsorbent polymer. This composite approach allows channels to maintain their form and function while the overall structure accommodates material expansion during use.
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 solution improves liquid acquisition and absorbency efficiency, maintains flexibility, and provides better fit and fluid absorption, while visually signaling the channels to caregivers through backsheet graphics, enhancing the absorbent article's performance and appearance.
Implementation Method 1
By immobilising the absorbent material or channels (by the use of adhesive, the channels are more permanent,)
Implementation Method 2
The absorbent core/structure typically includes superabsorbent polymer material, such as hydrogel-forming polymer material, also referred to as absorbent gelling material, AGM, or superabsorbent polymer, SAP
Implementation Method 3
improved liquid transport is achieved, and hence faster acquisition, and more efficient liquid absorbency over the whole absorbent structure
Data Source
AI summary
Absorbent articles herein may provide a topsheet, a backsheet, an absorbent core disposed between the topsheet and the backsheet. The absorbent core may comprise at least one channel having a shape. The backsheet graphics may substantially match the shape.