Absorbent Core Channels with Variable Bond Strength
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Solution Overview
Problem
Existing absorbent cores with semi-permanent channels for fluid distribution and swelling have difficulty in controlling the rate and pattern of channel opening, affecting the fit and fluid distribution in absorbent articles like diapers.
Innovation Solution
Incorporating two types of channels within the absorbent core, one with strong bonds for structural integrity in both dry and wet states and another with weak or no bonds for early fluid distribution and swelling accommodation, characterized by their Static Peel Force Time, allowing controlled release of space for absorbent material 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 absorbent core is divided into multiple discrete channels with different bonding characteristics. Each channel can be independently designed with specific bond strengths, allowing some channels to remain closed while others open gradually, providing both stability and controllable adaptability
Solution Approach 2:
Different regions of the absorbent core contain channels with locally optimized bonding characteristics. Channels in different areas have different bond strengths tailored to local fluid distribution needs, enabling spatially varying control over opening patterns while maintaining overall structural integrity
2Adaptability or versatility
If channels are left unbonded to allow quick opening for swelling, then adaptability is improved, but structural integrity and fit deteriorate
Solution Approach 1:
The absorbent core is segmented into channels with varying bond strengths, where some channels are designed to open quickly for swelling accommodation while others maintain stronger bonds for structural support, achieving both adaptability and stability through diversified channel behavior
Solution Approach 2:
The bond strength parameter of channels is varied across different locations and types. By adjusting bonding parameters (adhesive amount, bonding pressure, thermal treatment), channels are designed with specific opening characteristics - some with low bond strength for quick opening and others with high bond strength for structural integrity
3Ease of manufacture
If uniformly bonded channels are used, then manufacturing simplicity is maintained, but fluid distribution efficiency deteriorates
Solution Approach 1:
Rather than attempting to create uniform bonding across all channels, the invention segments channels into different types with different bonding characteristics. This approach simplifies manufacturing by using standardized bonding processes for each channel type while achieving superior fluid distribution through the diversity of channel behaviors
Solution Approach 2:
The bonding characteristics are locally optimized for different channel functions. Channels in fluid distribution regions have weaker bonds for easier opening and better fluid access, while channels in structural regions have stronger bonds, creating locally varied quality that enhances overall fluid distribution efficiency
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 approach enhances the fit and fluid distribution in absorbent articles by providing a controlled and efficient swelling mechanism, reducing side leakage and improving the overall performance of absorbent cores.
Implementation Method 1
Absorbent cores comprising channels for directing the fluid over a larger area of the absorbent core in a more efficient way than by diffusion
Implementation Method 2
The absorbent material usually comprises superabsorbent polymers (SAP) as is known in the art
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
Absorbent cores comprising channels for directing the fluid over a larger area of the absorbent core in a more efficient way than by diffusion
Implementation Method 5
an absorbent core for retaining the fluid
Data Source
AI summary
An absorbent article has a front side, a back side, a longitudinal axis, a liquid permeable topsheet, a liquid impermeable backsheet and an absorbent core between the topsheet and the backsheet. The absorbent core includes a first type of channels and a second type of channels. The first type of channels have bonds with a Static Peel Force Time which is higher than the Static Peel Force Time of the second type of channels.