Absorbent Core Channels With Segmented Bonding For Swelling Control
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Solution Overview
Problem
Existing absorbent cores with semi-permanent channels face challenges in controlling the rate and pattern of channel opening, affecting fluid distribution and absorbent material swelling, making it difficult to achieve a controlled release of space for swelling absorbent materials.
Innovation Solution
The introduction of two types of channels in absorbent cores, with one type having strong bonds for structural integrity in both dry and wet states and the other type having no or weaker bonds for initial fluid distribution and quick release of space as the absorbent material swells, allowing for controlled expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If bonded channels are used to maintain structural integrity, then channel stability is improved, but control over channel opening rate and pattern deteriorates
Solution Approach 1:
The channel bonds are segmented into two distinct types: strong bonds in first regions and weak bonds in second regions. This segmentation allows different portions of the channel system to perform different functions - strong bonds maintain structural integrity where needed, while weak bonds provide controlled opening behavior. The segmentation resolves the contradiction by spatially separating the conflicting requirements within the same channel system.
Solution Approach 2:
Different bond strengths are applied to different regions of the channels. First regions have strong bonds for structural stability, while second regions have weak bonds for controlled opening. This local differentiation of bond quality allows the channel system to simultaneously achieve both structural integrity and adaptability in channel opening behavior.
2Reliability
If semi-permanent bonds are used to maintain channels, then fluid distribution is improved, but ability to release space for swelling absorbent material deteriorates
Solution Approach 1:
The channel system is segmented into first regions with semi-permanent bonds for fluid distribution and second regions with weak bonds that open to release space. This segmentation allows the channel system to perform both functions - maintaining fluid distribution pathways where needed while providing space release in other regions as absorbent material swells.
Solution Approach 2:
The channel system transitions from a static semi-permanent structure to a dynamic system where channels in second regions can open and close based on swelling pressure. This dynamic behavior allows the system to adapt between maintaining structural integrity for fluid distribution and releasing space for absorbent material expansion.
3Adaptability or versatility
If weak bonds are used to allow quick opening, then space release for swelling is improved, but structural integrity deteriorates
Solution Approach 1:
The channel bonds are segmented into strong bonds in first regions and weak bonds in second regions. This segmentation allows weak bonds to provide space release functionality where needed without compromising the overall structural integrity provided by the strong bonds in first regions. The weak bonds are localized to specific areas where space release is required.
Solution Approach 2:
Different bond strengths are applied locally to different regions. Second regions have weak bonds optimized for opening and space release, while first regions have strong bonds maintaining structural integrity. This local differentiation allows the system to achieve both space release capability and overall structural strength.
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 design enhances fluid distribution and absorbent core performance by maintaining structural integrity while allowing for controlled swelling and space release, improving fit and fluid management in absorbent articles.
Implementation Method 1
an absorbent core for retaining the fluid
Implementation Method 2
Channels without any bond or immobilization, so that they quickly disappear as the absorbent material starts to swell and fills the channels
Implementation Method 3
The two sides of the core wrap may be bonded using known bonding techniques such as adhesive bonding, mechanical bonding, thermo-bonding, or ultra-sonic bonding
Implementation Method 4
The two sides of the core wrap may be bonded using known bonding techniques such as adhesive bonding, mechanical bonding, thermo-bonding, or ultra-sonic bonding
Data Source
AI summary
An absorbent article has a front side, a back side, a longitudinal axis and includes a liquid permeable topsheet on the wearer-facing side, a liquid impermeable backsheet on the garment-facing side, and an absorbent core between the topsheet and the backsheet. The absorbent core includes a core wrap having a top side and a bottom side, an absorbent material having a deposition area between the top side and the bottom side of the core wrap, and at least two channels substantially free of absorbent material within the deposition area. In a first type of channels, the top side and the bottom side of the core wrap are bonded to each other. In a second type of channels, the top side and the bottom side of the core wrap are not bonded or are less bonded to each other than in the first type of channels.