Absorbent Layer Structure for Viscous and Non-Viscous Liquids
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Solution Overview
Problem
Conventional absorbent articles have low absorption speed and tendency for viscous liquids to remain on the surface and leak, while existing cell absorbing sheets are unsuitable for viscous liquids due to their reliance on super absorbent polymer particles.
Innovation Solution
An absorbent article with a specialized upper auxiliary layer containing a super absorbent nonwoven fabric and first super absorbent polymer particles, combined with a cell absorbing sheet and a specific adhesive application pattern, to enhance absorption of viscous liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cell absorbing sheet with super absorbent polymer particles is used, then absorption performance for non-viscous liquid is improved, but absorption speed for viscous liquid deteriorates
Solution Approach 1:
The absorber is divided into two functional layers: an upper auxiliary layer with high absorption speed for viscous liquids and a main absorption layer (cell absorbing sheet) with high absorption performance for non-viscous liquids. This segmentation allows each layer to specialize in its optimal function, resolving the contradiction between speed and performance.
Solution Approach 2:
Different regions of the absorber are given different properties: the upper auxiliary layer uses super absorbent nonwoven fabric with specific fiber composition and pore structure optimized for viscous liquid uptake, while the main absorption layer uses cell absorbing sheet structure optimized for non-viscous liquid retention. Each layer's local quality matches its specific function.
2Stability of the object's composition
If adhesive application rate is increased to fix super absorbent polymer particles, then particle stability is improved, but gel blocking increases
Solution Approach 1:
Instead of applying adhesive uniformly across the entire surface, the adhesive is applied intermittently at a controlled rate of 4 to 10 g/m². This partial application provides sufficient particle fixation while leaving gaps that prevent excessive adhesive accumulation and subsequent gel blocking, resolving the contradiction between stability and harmful effects.
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 absorbent article achieves rapid absorption and retention of viscous liquids, while maintaining flexibility and preventing adhesive-induced gel blocking, ensuring effective absorption of both viscous and non-viscous liquids.
Implementation Method 1
the super absorbent nonwoven fabric having a surface exposed on an uppermost surface of the absorber and having a Klemm water absorptiveness of 100 mm or more
Implementation Method 2
the absorbed and diffused viscous liquid is delivered to the first super absorbent polymer particles adjacent to the back surface of the super absorbent nonwoven fabric so as to be absorbed and retained by the first super absorbent polymer particles
Implementation Method 3
the first super absorbent polymer particles are fixed to an upper surface of the upper sheet of the main absorption layer with an adhesive
Data Source
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AI summary
To achieve both of absorbability of a viscous liquid and absorption performance of a non-viscous liquid. The above problem is solved by an absorbent article wherein an upper auxiliary layer 71 of an absorber 70 includes a super absorbent nonwoven fabric 42 having a surface exposed on an uppermost surface of the absorber 70 and having a Klemm water absorptiveness of 100 mm or more, and first super absorbent polymer particles 43 adjacent to a back surface of the super absorbent nonwoven fabric 42; a main absorption layer 72 of the absorber 70 is a cell absorbing sheet 50 having second super absorbent polymer particles 53 contained in cells 55 arranged at intervals; the first super absorbent polymer particles 43 are fixed to an upper surface of an upper sheet 51 of the main absorption layer 72 with an adhesive 43h; the upper sheet 51 is formed of a short fiber nonwoven fabric and has a larger amount of fuzz 51f on the upper surface thereof than a lower surface thereof; and the adhesive 43h is applied in an intermittent pattern at an application rate of 4 to 10 g/m2.