Quick-drying Absorption Core with Stepwise SAP Distribution
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Solution Overview
Problem
Conventional absorbent cores in disposable hygiene products suffer from agglomeration, fragmentation, excessive thickness, inadequate breathability, and susceptibility to super absorbent polymer displacement or leakage, compromising absorbency efficiency.
Innovation Solution
A quick-drying absorption core design featuring an absorbent core body with an upper and lower nonwoven fabric layer adhesively laminated onto a fluffy nonwoven fabric layer, where super absorbent polymer is embedded within the fluffy layer's pores and applied in a stepwise diminishing manner from the longitudinal midpoint to the ends, with guidance channels to secure the layers and prevent polymer leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional absorbent cores use a blend of cellulose fibers and super absorbent polymer in a block-like structure, then absorbency is achieved, but the core becomes prone to agglomeration and fragmentation during usage
Solution Approach 1:
The absorbent core is divided into multiple layers (first nonwoven fabric layer, second nonwoven fabric layer, and intermediate layer) with super absorbent polymer selectively distributed in specific regions. This segmentation prevents uniform agglomeration and maintains structural integrity during use.
Solution Approach 2:
Super absorbent polymer is applied with varying densities at different locations - higher density in the longitudinal center region and lower density toward the ends. This local quality distribution optimizes absorbency where needed while reducing agglomeration risks in other areas.
2Length of stationary object
If conventional absorbent cores use a double-layer or triple-layer nonwoven fabric arrangement with middle layer infused with super absorbent polymer, then thickness is reduced, but the super absorbent polymer becomes susceptible to displacement or leakage
Solution Approach 1:
The super absorbent polymer is embedded within the pore structure of the fluffy nonwoven fabric intermediate layer, which is itself sandwiched between two nonwoven fabric layers. This nested arrangement secures the polymer in place while maintaining thin overall thickness.
Solution Approach 2:
The fluffy nonwoven fabric intermediate layer acts as an intermediary that holds the super absorbent polymer in place through its porous structure, preventing direct contact and potential displacement while maintaining the reduced thickness design.
3Reliability
If conventional absorbent cores use a block-like structure enveloped in nonwoven fabric, then absorbency is achieved, but breathability is inadequate
Solution Approach 1:
The absorbent core uses fluffy nonwoven fabric with controlled porosity as the intermediate layer, allowing air and fluid passage while maintaining absorbency. The porous structure enhances breathability without compromising the absorbent function.
4Reliability
If super absorbent polymer density is increased throughout the entire absorbent core, then absorbency is improved, but production costs increase
Solution Approach 1:
Super absorbent polymer is concentrated in the longitudinal center region where absorbency is most needed, with reduced or no polymer at the ends. This local quality approach maintains high absorbency performance while reducing overall polymer consumption and production costs.
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 design enhances absorbency efficiency by maintaining super absorbent polymer distribution, reducing production costs, preventing leakage, and ensuring sustained water-absorbing performance, while also improving user comfort through reduced thickness and improved breathability.
Implementation Method 1
The upper and lower surfaces of the fluffy nonwoven fabric layer are provided with super absorbent polymer
Implementation Method 2
These hydrogel materials are dispersed onto the upper surface of one layer of nonwoven fabric
Implementation Method 3
The upper nonwoven fabric layer is adhesively laminated onto the upper surface of the fluffy nonwoven fabric layer, while the lower nonwoven fabric layer is adhesively laminated onto the lower surface of the fluffy nonwoven fabric layer
Implementation Method 4
securing to the upper nonwoven fabric layer and the fluffy nonwoven fabric layer through heat pressing or ultrasonic welding
Implementation Method 5
securing to the upper nonwoven fabric layer and the fluffy nonwoven fabric layer through heat pressing or ultrasonic welding
Data Source
AI summary
This invention relates to the field of disposable sanitary products, particularly focusing on a highly efficient quick-drying absorption core. The absorption core includes an absorbent core body, which includes upper nonwoven fabric layer, a fluffy nonwoven fabric layer, and a lower nonwoven fabric layer. Super absorbent polymer is positioned on the upper and lower surfaces of the fluffy nonwoven fabric layer, with the polymer being partially embedded within the pores of the fluffy nonwoven fabric layer. The density of the super absorbent polymer on the fluffy nonwoven fabric layer decreases in a stepwise manner from the longitudinal center towards both ends. The upper nonwoven layer is bonded to the upper surface of the fluffy nonwoven layer, while the lower nonwoven layer is bonded to the lower surface of the fluffy nonwoven layer. The absorbent core body is pressed with two guiding channels running along its longitudinal center.