Absorbent Article Slit Deformation Prevention via Bonded Wrapping Sheet
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Solution Overview
Problem
The absorbent articles in disposable diapers often experience slit deformation and crushing due to the contraction of the crotch portion between legs, which hinders diffusibility and absorption efficiency.
Innovation Solution
An absorbent article design featuring a wrapping sheet with a connecting portion that extends over both sides of the slit, bonded with hot melt adhesive, providing increased rigidity and acting as a spacer to prevent slit deformation, with the connecting portion preferably located on the back face side to maintain flexibility and prevent liquid accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slit width is increased to prevent crush, then the diffusibility is improved, but the absorption amount decreases and the slit formation region is likely to be excessively deformed
Solution Approach 1:
The wrapping sheet is divided into distinct functional zones: the connecting portion with high rigidity for structural support, and other portions with appropriate flexibility for absorption. This segmentation allows the slit region to maintain its shape while preserving the overall absorption capacity of the absorbent article.
Solution Approach 2:
The connecting portion is specifically designed with higher rigidity only where needed to support the slit, while other regions of the wrapping sheet maintain their original properties for absorption. This localized quality enhancement prevents excessive deformation of the slit formation region without compromising the overall absorption amount.
2Reliability
If the connecting portion is made with higher rigidity to suppress crush, then the slit shape is maintained, but the flexibility of the absorbent article may be reduced
Solution Approach 1:
The wrapping sheet is divided into distinct functional zones: the connecting portion with high rigidity for structural support, and other portions with appropriate flexibility for absorption. This segmentation allows the slit region to maintain its shape while preserving the overall absorption capacity of the absorbent article.
Solution Approach 2:
The connecting portion is specifically designed with higher rigidity only where needed to support the slit, while other regions of the wrapping sheet maintain their original properties for absorption. This localized quality enhancement prevents excessive deformation of the slit formation region without compromising the overall absorption amount.
3Strength
If hot melt adhesive is used to bond the connecting portion, then the structural integrity is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent replaces mechanical bonding methods with hot melt adhesive bonding. This substitution provides stronger and more reliable bonding of the connecting portion while maintaining compatibility with existing manufacturing processes, as hot melt adhesive is a standard material in absorbent article production.
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 effectively suppresses slit deformation and maintains absorption efficiency by enhancing the rigidity of the connecting portion, ensuring the absorbent article's shape integrity and performance.
Implementation Method 1
overlapping parts of the both side parts being bonded each other through a hot melt adhesive to form a connecting portion
Implementation Method 2
at least a surface of the absorbent body on a connecting portion side being bonded to an internal surface of the wrapping sheet through a hot melt adhesive
Data Source
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AI summary
Crush of a slit of an absorbent body is suppressed. Provided is an absorbent article including an absorbent element (50) obtained by wrapping an absorbent body (56) in a wrapping sheet (58), wherein the wrapping sheet (58) includes an intermediate part (58m) located on one side of a front side and a back side of the absorbent body (56) and both side parts (58s) folded back to the other side of the absorbent body (56) from the intermediate part (58m), the both side parts (58s) are overlapped with each other on the other side of the absorbent body (56), an over lapped part is bonded through a hot melt adhesive (H3) to form a connecting portion (58c), at least a surface of the absorbent body (56) on a side of the connecting portion (58c) is bonded to an internal surface of the wrapping sheet (58) through hot melt adhesives (H1 and H2), and the connecting portion (58c) of the wrapping sheet (58) extends in a width direction to extend over both widthwise sides of a slit (54) provided in the absorbent body (56).