Absorbent Article Structure for Liquid Stool Leakage Control
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Solution Overview
Problem
Existing absorbent articles fail to effectively manage liquid stool, leading to leakage, and previous solutions either compromise environmental safety or wearer health.
Innovation Solution
An absorbent article comprising an air-through bonded nonwoven topsheet, a spunbonded and/or thermocarded nonwoven acquisition distribution layer, and an absorbent core with channels free of absorbent material, utilizing capillary effects to draw and distribute liquid stool efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional absorbent articles are used, then basic absorption function is provided, but liquid stool leakage occurs due to insufficient capillary effect and wicking properties
Solution Approach 1:
The patent employs an air-through bonded nonwoven topsheet with high porosity and interconnected voids to enhance capillary action. The porous structure allows liquid stool to be rapidly drawn into the absorbent core through capillary forces, preventing run-off and leakage while maintaining breathability and comfort.
Solution Approach 2:
The patent utilizes a composite nonwoven structure combining different fiber types and bonding methods. The air-through bonded nonwoven layer is复合 with the absorbent core, creating a multi-layer composite system that optimizes both capillary wicking and absorption capabilities to effectively manage liquid stool.
2Reliability
If chemical additives are used to increase viscosity, then liquid stool immobilization is improved, but environmental harm and health risks increase
Solution Approach 1:
The patent replaces chemical additives with a purely physical mechanism - the capillary effect - to immobilize liquid stool. The porous structure of the air-through bonded nonwoven material and the capillary channels within the absorbent core work together to draw in and retain liquid stool through physical forces alone, eliminating the need for harmful chemical viscosity modifiers.
Solution Approach 2:
The absorbent article structure itself provides the immobilization function through its inherent capillary properties. The porous material and channel network automatically draw in and hold liquid stool without requiring external chemical agents, making the system self-sufficient and environmentally friendly.
3Productivity
If channels free of absorbent material are added, then fluid distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The absorbent core is segmented into regions with and without absorbent material to create channels. These channels are distributed throughout the core structure, allowing rapid fluid transport pathways while maintaining adequate absorption zones. This segmentation enables efficient fluid distribution without requiring complex external channel structures.
Solution Approach 2:
The patent merges the channel formation with the absorbent core manufacturing process itself. By strategically placing and removing absorbent material during core formation, the channels are integrated into the core structure, eliminating the need for separate channel components and reducing overall manufacturing complexity.
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 combination of these layers effectively immobilizes liquid stool, reducing leakage and enhancing environmental friendliness by avoiding harmful chemical additives.
Implementation Method 1
The synergistic combination of these three layers that consists essentially of or comprise: an air-through bonded nonwoven layer, a spunbonded and/or thermocarded nonwoven layer and an absorbent material layer comprising at least one channel free of absorbent material, enables an improved capillary effect or wicking effect.
Implementation Method 2
The absorbent core comprises at least an absorbent material layer... The absorbent material can be selected from a group consisting of cellulose fibers, superabsorbent polymers and combinations thereof
Data Source
AI summary
The current invention concerns an absorbent article (10) comprising an absorbent core (12) sandwiched between a liquid permeable topsheet (14) and a liquid impermeable backsheet (16), and an acquisition distribution layer (18) arranged between said topsheet (14) and said absorbent core (12), wherein the absorbent core (12) comprises at least an absorbent material layer. According to the invention the topsheet (14) consists essentially of an air-through bonded nonwoven layer and is free of spunbond nonwoven layers, the acquisition distribution layer (18) comprises a spunbonded and/or thermocarded nonwoven layer, and the absorbent core (12) comprises at least one channel (26) free of absorbent material. The invention also relates to the use of such an absorbent article (10), for managing liquid stool.