Pulpless Absorbent Core with Non-Uniform Particulate Distribution
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Solution Overview
Problem
Conventional absorbent cores in products like diapers and incontinence products contain cellulose fibers, which increase bulk and are not ideal for high absorbency without significant bulk reduction.
Innovation Solution
Development of pulpless absorbent cores with a carrier sheet and particulate material distribution, where the central region has a higher basis weight than the edge regions, and cellulose fibers comprise less than 10% of the core's weight, using different adhesives like hot melt and spray application aqueous binder adhesives for stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cellulose fibers are used in absorbent cores, then absorbent capacity is improved, but bulk increases
Solution Approach 1:
The patent removes cellulose fibers from the absorbent core, extracting the bulk-contributing material while retaining the essential absorbent function through alternative structures (particulate material layers on a substrate) that achieve high absorbency without the volumetric penalty of traditional pulp
Solution Approach 2:
The patent changes the physical and chemical parameters of the absorbent core by using particulate absorbent materials with controlled size distributions, densities, and surface properties, allowing high absorbent capacity to be achieved at reduced bulk through optimized material characteristics rather than increased volume
2Volume of moving object
If cellulose fibers are removed to reduce bulk, then bulk is reduced, but absorbent capacity decreases
Solution Approach 1:
The patent employs composite structures combining a substrate material with particulate absorbent materials, creating a synergistic system where the substrate provides structural support and the particulate materials provide absorbent capacity, achieving high performance at reduced bulk through material composition optimization
Solution Approach 2:
The patent applies different materials and structures to different regions of the absorbent core, with particulate material layers strategically positioned to maximize absorbency in high-demand areas while minimizing bulk in regions where structural support is sufficient, creating a functionally optimized non-uniform structure
3Ease of manufacture
If particulate material is distributed uniformly, then manufacturing simplicity is improved, but absorbent performance decreases
Solution Approach 1:
The patent implements non-uniform distribution of particulate materials with varying concentrations, sizes, and types across different regions of the absorbent core, optimizing absorbent performance by placing materials strategically where they are most needed while maintaining compatibility with existing manufacturing processes through controlled application methods
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 pulpless absorbent cores achieve high absorbency with reduced thickness and bulk, maintaining performance similar to cores with higher cellulose fiber content while minimizing material usage.
Implementation Method 1
the absorbent core may further comprise a first adhesive and a second adhesive
Implementation Method 2
particulate material disposed on the carrier sheet through the first edge region, the central region, and the second edge region
Implementation Method 3
absorbent cores achieve high absorbency with reduced thickness and bulk
Data Source
AI summary
Pulpless absorbent cores and methods of manufacture are disclosed. A first exemplary absorbent core may comprise a carrier sheet having a first edge region, a central region, and a second edge region and particulate material disposed on the carrier sheet through the first edge region, the central region, and the second edge region. The absorbent core may additionally have an absorbent core width and the central region may have a central region width, and the central width may comprise between 33% and 75% of the absorbent core width. Further, the central region may comprise an average basis weight of particulate material that is at least 110% of an average basis weight of particulate material within at least one of the left edge region and the right edge region.