Absorbent Core Channel Stability via High Viscosity Adhesive Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing absorbent cores in hygiene products face challenges in maintaining liquid distribution and stability, especially in the wet state, which can lead to leakage and discomfort, despite advancements in fluid absorption and distribution.
Innovation Solution
An absorbent core design featuring channels formed by bonding a top and bottom core wrap layer with a rubber-based hot melt adhesive of at least 5500 mPa·s viscosity, creating channels free of absorbent material to enhance stability and liquid distribution, while maintaining comfort and fit throughout the product's use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If channels are formed in absorbent cores to improve fluid distribution, then liquid distribution is improved, but channel stability deteriorates in wet state
Solution Approach 1:
The patent applies parameter changes by selecting a hot melt adhesive with specific viscosity characteristics (at least 5500 mPa·s at 150°C) to bond the top and bottom core wrap layers. This viscosity parameter ensures the adhesive maintains sufficient bonding strength at elevated temperatures during manufacturing while providing stable channel formation that persists in the wet state during use, thereby resolving the contradiction between achieving good liquid distribution through channels and maintaining channel stability.
2Stability of the object's composition
If rubber-based adhesive with high viscosity is used to bond core wrap layers, then channel stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter requirements for the hot melt adhesive, including viscosity of at least 5500 mPa·s at 150°C and rubber-based composition. By defining these specific parameters, the patent ensures stable channel formation while providing clear manufacturing guidelines that actually simplify the process by eliminating the need for complex adhesive formulation or application adjustments, thus resolving the contradiction between achieving stability and maintaining manufacturing simplicity.
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 solution provides exceptional bonding strength and stability within the channels, ensuring consistent liquid distribution and improved absorption capacity, reducing the risk of leakage and enhancing wearer comfort in both dry and wet states.
Implementation Method 1
A top layer of said core wrap is bonded via a hot melt adhesive to a bottom layer of said core wrap at one or more attachment zones to form one or more channels substantially free of absorbent material
Implementation Method 2
The hot melt adhesive is selected from the group consisting of rubber-based adhesives, adhesives having a viscosity of at least 5500 mPa·s at 150° C. and rubber-based adhesives having a viscosity of at least 5500 mPa·s at 150° C.
Data Source
AI summary
The present invention relates to absorbent articles comprising an absorbent core wherein 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 bonded via a hot melt adhesive to a bottom layer of said core wrap at one or more attachment zones to form one or more channels substantially free of absorbent material. The hot melt adhesive is selected from the group consisting of rubber-based adhesives, adhesives having a viscosity of at least 5500 mPa·s at 150° C. and rubber-based adhesives having a viscosity of at least 5500 mPa·s at 150° C. This may provide exceptionally strong bonding and excellent stability within the channel(s), even in wet state.