Absorbent Body Production via Pressure Gradient Suction
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Solution Overview
Problem
Existing absorbent bodies in absorbent articles tend to experience rewet issues due to the granular absorbent substance remaining on the surface of the fiber sheet rather than penetrating into the fiber sheet, leading to reduced effectiveness.
Innovation Solution
An absorbent body producing method that utilizes a pressure difference increasing mechanism to enhance the penetration of granular absorbent substances into the fiber sheet by spraying the substance onto the napped surface and using a conveying device with a suction section, where the pressure difference between the conveyance surface and the fiber sheet is increased to facilitate deeper absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a granular absorbent substance is sprayed onto the napped surface of a fiber sheet using conventional suction, then the absorbent substance is held on the fiber sheet surface, but the absorbent substance does not penetrate sufficiently into the fiber sheet interior causing rewet issues
Solution Approach 1:
The patent applies pneumatic principles by using a conveying device with a conveyance surface that generates suction to penetrate the fiber sheet. The suction force draws the sprayed absorbent substance from the napped surface through the fiber sheet interior, ensuring deep penetration and preventing rewet. This pneumatic mechanism directly addresses the contradiction by providing the necessary force to move the absorbent substance into the fiber sheet bulk.
Solution Approach 2:
The patent changes the pressure parameter by creating a pressure difference between the conveyance surface side (suction side) and the opposite side of the fiber sheet. This pressure gradient enables the absorbent substance to be drawn through the fiber sheet. By controlling and optimizing this pressure difference, the patent achieves sufficient penetration depth while maintaining reliability and preventing rewet.
2Manufacturing precision
If suction force is increased to enhance absorbent substance penetration, then penetration depth improves, but fiber sheet structure may be damaged or production complexity increases
Solution Approach 1:
The conveying device with the conveyance surface serves multiple functions: it conveys the fiber sheet through the production line, generates suction to penetrate the absorbent substance into the fiber sheet, and maintains structural integrity during processing. This multi-functionality reduces the need for additional separate devices, thereby limiting the increase in device complexity while achieving the desired penetration depth.
Solution Approach 2:
The fiber sheet is designed with a porous structure that allows the absorbent substance to penetrate through it under suction. The porous nature of the fiber sheet enables effective penetration without requiring excessive suction force that could damage the fiber sheet structure. This material property facilitates the balance between penetration depth and structural integrity.
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 method results in an absorbent body with a higher amount of granular absorbent substance penetrating into the fiber sheet, reducing rewet occurrences and improving the absorbency of the absorbent article.
Implementation Method 1
a conveying device with a suction section, where the other main surface side of the fiber sheet is sucked through the conveyance surface
Implementation Method 2
pressure difference increasing means that suppresses an air flow penetrating the fiber sheet to move inward from the conveyance surface to thereby increase the pressure difference between the conveyance surface side and the opposite side of the fiber sheet
Data Source
AI summary
An absorbent body in which a larger amount of a granular absorbent substance penetrates into the inside of a fiber sheet is produced. A fiber sheet having napped one main surface is supplied to a conveying device and conveyed while the other main surface of the fiber sheet is being sucked through a conveyance surface. A granular absorbent substance is sprayed onto the napped one main surface of the fiber sheet to cause the substance to penetrate into the inside of the fiber sheet in a suction section. A pressure difference increasing device is provided that faces the one main surface of the fiber sheet sprayed with the absorbent substance and being conveyed in the suction section, and that suppresses air from flowing through the fiber sheet inward from the conveyance surface to increase the pressure difference between the conveyance surface side and the opposite side of the fiber sheet.