Channeled Absorbent Core Wrap With Asymmetric Adhesive Stripes
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Solution Overview
Problem
Existing absorbent articles face challenges in achieving strong bonding strength and resilience in channel forming areas while maintaining optimal core stability, flexibility, and liquid intake permeability.
Innovation Solution
The absorbent article features a design with a top layer of core wrap adhered to a bottom layer using a first adhesive to form channel forming areas free of absorbent material, where the top layer has a greater adhesive surface area than the bottom layer, creating a ratio of adhesive areas greater than 1.5, with adhesive stripes positioned to overlap and surround the channels, enhancing flexibility and stability without compromising bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to form channel bonding areas in absorbent articles, then bonding strength is improved, but core flexibility and liquid permeability deteriorate due to high surface area coverage and stiffening effects
Solution Approach 1:
The patent applies adhesive only in specific channel bonding areas rather than across the entire surface, creating localized bonding zones that provide necessary strength while leaving other areas flexible and permeable to liquid
Solution Approach 2:
The adhesive application is segmented into discrete channel bonding areas rather than continuous coverage, allowing different regions of the core to have different properties (bonded vs. flexible/permeable)
2Strength
If adhesive surface area is increased to improve bonding strength, then bonding strength is improved, but core stability and liquid permeability deteriorate
Solution Approach 1:
Adhesive is concentrated in specific channel bonding areas with optimized surface area, providing strong bonding where needed while maintaining core stability and liquid permeability in non-bonded regions
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 improves flexibility and reduces hydrophobic material contamination, leading to better liquid handling and reduced rewet performance, while maintaining strong attachment and core stability.
Implementation Method 1
a top layer (7) of said core wrap is adhered to a bottom layer (8) of said core wrap by a first adhesive (11) to form one or more channel forming areas (10)
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 3A~3C
AI summary
An absorbent article comprising: a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core positioned between said topsheet and backsheet, wherein the absorbent core comprises an absorbent material, said absorbent material comprising cellulose fibers and/or superabsorbent polymers, and wherein said absorbent material is contained within at least one core wrap substrate enclosing said absorbent material, and wherein a top layer of said core wrap is adhered to a bottom layer of said core wrap by a first adhesive to form one or more channel forming areas substantially free of said absorbent material, wherein said top layer comprises said first adhesive arranged to define a first adhesive area and said bottom layer comprises a second adhesive arranged to define a second area, wherein said first adhesive area is greater than said second adhesive area, and wherein said first and second adhesive areas comprise one or more adhesive stripes, wherein at least one of said adhesive stripes of the first adhesive area overlap said channel forming areas.