Absorbent Article With Diffusion Layer and Resin Powder
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Solution Overview
Problem
Existing absorbent articles face challenges in achieving high absorption speed and dryness after fluid absorption due to issues like gel blocking and poor liquid passing properties, particularly when using nonwoven fabrics or fibers with high wettability.
Innovation Solution
The absorbent article incorporates a water absorbent resin powder with specific properties (absorption speed, liquid passing speed, and moisture absorption blocking ratio) and a diffusion layer of synthetic fibers with no water absorption, allowing for efficient fluid diffusion and absorption by the resin powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If nonwoven fabric is used as body fluid diffusing member, then absorption speed is improved, but liquid passing property becomes poor due to fiber adhesion and tangling
Solution Approach 1:
The patent applies parameter changes by specifying precise parameters for the water absorbent resin powder: absorption speed of 20-50 seconds, liquid passing speed of 10 seconds or less, and moisture absorption blocking ratio of 5% or less. These parameter optimizations resolve the contradiction by selecting resin properties that simultaneously achieve high absorption speed while maintaining excellent liquid passing properties, avoiding the fiber adhesion issues of nonwoven fabrics.
Solution Approach 2:
The patent uses composite materials by combining water absorbent resin powder with a specific nonwoven fabric structure. The nonwoven fabric has a basis weight of 20-100 g/m², thickness of 1-10 mm, and compression recovery rate of 60% or more, creating a composite structure that maintains fiber separation and prevents tangling while enabling rapid fluid passage and absorption.
2Speed
If fiber with very high wettability is used as body fluid diffusing member, then absorption speed is improved, but body fluid remains on fiber surface reducing dryness
Solution Approach 1:
The patent applies parameter changes by optimizing the moisture absorption blocking ratio of the water absorbent resin powder to be 5% or less. This parameter control ensures that the resin absorbs fluid rapidly while preventing excessive surface retention, thereby maintaining high dryness after absorption. The specific parameter optimization resolves the contradiction between absorption speed and surface dryness.
3Quantity of substance
If amount of water absorbent resin powder is increased, then absorption capacity is improved, but gel blocking occurs reducing absorption speed and dryness
Solution Approach 1:
The patent applies parameter changes by optimizing multiple parameters of the water absorbent resin powder simultaneously: absorption speed of 20-50 seconds, liquid passing speed of 10 seconds or less, and moisture absorption blocking ratio of 5% or less. This multi-parameter optimization prevents gel blocking by selecting resin properties that maintain pore structure and fluid passage even at high resin concentrations, thereby achieving both high absorption capacity and high absorption speed.
Solution Approach 2:
The patent uses composite materials by combining water absorbent resin powder with a nonwoven fabric having specific properties (basis weight 20-100 g/m², thickness 1-10 mm, compression recovery rate ≥60%). This composite structure prevents gel blocking by providing a three-dimensional framework that maintains fluid passage channels, allowing high resin content to be used without sacrificing absorption speed or dryness.
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 configuration enhances absorption speed and maintains excellent dryness by ensuring fluid is absorbed by the resin powder, reducing return to the skin surface and improving the overall performance of absorbent articles like incontinence pads and diapers.
Implementation Method 1
body fluid is absorbed and retained in the water absorbent resin powder inside the absorbent body
Implementation Method 2
The absorbent body generally includes a water absorbent resin powder, and body fluid is absorbed and retained in the water absorbent resin powder
Implementation Method 3
a diffusion sheet with higher liquid permeability than the absorbent body is disposed on the rear surface of the absorbent body
Data Source
AI summary
An objective of the present invention is to provide an absorbent article having an excellent absorption speed of body fluid and excellent dryness after absorbing body fluid. The absorbent article of the present invention comprises: an absorbent body where a water absorbent resin powder meeting the following requirements (a) to (c) is disposed, (a) an absorption speed measured by a vortex method: 20 seconds to 50 seconds, (b) a liquid passing speed under load: 10 seconds or less, (c) a moisture absorption blocking ratio: 5% or less; and a diffusion layer composed of a synthetic fiber assembly substantially having no water absorption.