Wet-Laid Distribution Material for Absorbent Core Void Retention
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Solution Overview
Problem
Air-laid distribution materials in absorbent articles lose structure and wet integrity upon exposure to liquid bodily exudates and wearer-induced strains, leading to reduced effectiveness in distributing liquids evenly and maintaining void volume.
Innovation Solution
Employing wet-laid and/or wet-formed distribution materials with high wet strength and integrity, comprising at least 80% pulp fibers, which maintain a three-dimensional structure and void volume under compression and strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air-laid distribution materials are used, then the absorbent article can be manufactured with simpler process, but the distribution material loses structure and wet integrity upon exposure to liquid bodily exudates and wearer-induced strains
Solution Approach 1:
The patent changes the manufacturing parameters from air-laid process to wet-laid process, and specifies fiber content parameters (at least 80% pulp fibers by weight). These parameter changes transform the distribution material's properties to maintain structural integrity while wet, resolving the contradiction between ease of manufacture and wet integrity reliability.
Solution Approach 2:
The patent creates a composite fibrous substrate comprising at least 80% pulp fibers and at most 20% other fibers by weight. This composite material structure combines the advantages of pulp fibers (wet strength, absorbency) with potentially reinforcing fibers, achieving both manufacturability and reliable wet integrity.
2Ease of manufacture
If air-laid distribution materials are used, then the manufacturing process is simpler, but the distribution material collapses or loses structure after receiving liquid bodily exudates
Solution Approach 1:
The patent changes the manufacturing method parameter from air-laid to wet-laid process, and specifies fiber composition parameters (at least 80% pulp fibers). These parameter changes ensure the distribution material maintains its three-dimensional structure and shape even when wet with liquid bodily exudates, resolving the contradiction between manufacturing simplicity and structural integrity.
3Ease of manufacture
If air-laid distribution materials are used, then the manufacturing process is simpler, but the distribution material is subject to caliper loss and tearing under compressive loads and strains
Solution Approach 1:
The patent changes the manufacturing process from air-laid to wet-laid and specifies the fiber content parameter (at least 80% pulp fibers by weight). These parameter changes significantly improve the wet strength of the distribution material, enabling it to withstand compressive loads and wearer-induced strains without tearing or excessive caliper loss, while maintaining reasonable manufacturing simplicity.
Solution Approach 2:
The patent employs a composite fibrous substrate with at least 80% pulp fibers and at most 20% other fibers. This composite structure leverages the high wet strength of pulp fibers while allowing incorporation of up to 20% other fibers that may provide additional mechanical reinforcement, resolving the contradiction between manufacturing simplicity and wet strength requirements.
4Ease of manufacture
If air-laid distribution materials are used, then the manufacturing process is simpler, but the distribution material cannot maintain void volume under compression and strain
Solution Approach 1:
The patent changes the manufacturing process from air-laid to wet-laid and specifies fiber composition parameters (at least 80% pulp fibers). These parameter changes enable the distribution material to maintain its three-dimensional structure and void volume even under compression and wearer-induced strains, while keeping the manufacturing process relatively simple.
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 wet-laid materials effectively distribute liquid bodily exudates evenly across the absorbent core, maintaining structural integrity and void volume despite wetting and wearer-induced strains, enhancing the absorbent article's performance.
Implementation Method 1
The liquid distribution mat has high vertical wicking properties and excellent structural integrity in both wet and dry states
Implementation Method 2
The distribution material is able to receive liquid bodily exudates and distribute and/or transfer them to the absorbent core
Data Source
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AI summary
An absorbent article comprises a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent core positioned at least partially intermediate the topsheet and the backsheet, and a distribution material comprising a wet-laid, three-dimensional fibrous substrate comprising at least 80% pulp fibers by weight of the wet-laid, three-dimensional fibrous substrate. The wet-laid, three-dimensional fibrous substrate comprises a continuous network region, a plurality of discrete zones, and a plurality of transition regions. The transition regions are positioned intermediate the continuous network region and at least some of the plurality of discrete zones.