Absorbent Article Wrapping Sheet Adhesive Bonding
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Solution Overview
Problem
Conventional absorbent articles face issues with high absorbent polymer particles leaking from the connecting portion of the wrapping sheet, leading to skin contamination and potential clogging in the manufacturing process, while also experiencing shape deformation and absorption inhibition due to uneven adhesive distribution.
Innovation Solution
The absorbent article features an absorbent body with a higher content rate of high absorbent polymer particles on the back face side, where the wrapping sheet's connecting portion is located underneath, and a strategic use of hot melt adhesive to enhance bonding strength and prevent leakage, with increased adhesive usage at the end portions and narrowing regions to maintain shape stability and capture spilled particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high absorbent polymer particles are used to prevent returning, then absorption performance is improved, but particle leakage from the connecting portion occurs causing skin contamination
Solution Approach 1:
The patent applies different adhesive characteristics to different regions of the wrapping sheet. The connecting portion uses adhesive with higher viscosity and stronger bonding capability to prevent particle leakage, while other portions use adhesive with appropriate flow characteristics. This local differentiation resolves the contradiction by providing enhanced protection where needed without compromising overall absorption performance.
Solution Approach 2:
The patent changes the adhesive parameters (viscosity, bonding strength) specifically at the connecting portion to prevent particle leakage. By adjusting these parameters locally rather than uniformly, the system maintains high absorbent polymer content for prevention of returning while eliminating the harmful leakage effect through enhanced adhesive bonding at the critical connection point.
2Ease of manufacture
If adhesive is applied uniformly across the wrapping sheet, then manufacturing is simplified, but shape deformation occurs due to uneven adhesive distribution
Solution Approach 1:
The patent implements local quality by applying adhesive with different characteristics to different regions. The connecting portion receives adhesive with higher viscosity and bonding strength to maintain shape stability, while other regions use adhesive with appropriate flow properties. This resolves the contradiction by maintaining manufacturing simplicity through a systematic approach while achieving shape stability through localized optimization.
Solution Approach 2:
The patent segments the adhesive application into different zones with different properties. The connecting portion is treated as a special zone requiring enhanced adhesive characteristics, while the rest of the wrapping sheet uses standard adhesive application. This segmentation allows the system to maintain overall manufacturing simplicity while addressing shape stability requirements at critical locations.
3Strength
If adhesive usage is increased at end portions to prevent particle leakage, then bonding strength is improved, but adhesive consumption increases
Solution Approach 1:
The patent applies local quality by concentrating enhanced adhesive bonding at the connecting portion where particle leakage prevention is most critical. This localized approach provides the necessary bonding strength to contain high absorbent polymer particles while minimizing overall adhesive consumption compared to uniform enhancement across the entire wrapping sheet.
Solution Approach 2:
The patent applies partial action by providing enhanced adhesive bonding only where absolutely necessary (at the connecting portion) rather than uniformly across the entire wrapping sheet. This partial enhancement achieves the required bonding strength to prevent particle leakage while avoiding excessive adhesive consumption that would result from comprehensive reinforcement.
4Object-affected harmful factors
If the connecting portion is located at the back face side under the absorbent body, then particle leakage risk is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing enhanced adhesive bonding at the connecting portion located at the back face side. This positioning, combined with localized adhesive enhancement, creates a dual protection system that reduces particle leakage risk while the adhesive serves as a buffer to accommodate minor positioning variations, thereby managing manufacturing precision requirements.
Solution Approach 2:
The patent applies beforehand cushioning by using enhanced adhesive bonding at the connecting portion to compensate for potential positioning inaccuracies. The adhesive acts as a cushioning layer that accommodates minor deviations in wrapping sheet positioning while maintaining secure bonding and preventing particle leakage, thus reducing the stringency of manufacturing precision requirements.
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 effectively reduces the risk of high absorbent polymer particle leakage, prevents returning, and minimizes shape deformation while optimizing adhesive usage for improved absorbency and durability.
Implementation Method 1
a whole part of an internal surface of the wrapping sheet (58) facing the absorbent body (56) is bonded to an external surface of the absorbent body (56) through a hot melt adhesive (H1, H2...)
Implementation Method 2
a content rate of the high absorbent polymer particles of the absorbent body increases stepwise or continuously from the back face side toward the front face side
Data Source
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AI summary
A risk of leakage of high absorbent polymer particles from a connecting portion of wrapping sheet is reduced while returning is prevented. Provided is an absorbent article, in which an absorbent body (56) is obtained by mixing and accumulating fibers and high absorbent polymer particles (56P), a wrapping sheet (58) includes an intermediate part located on a front face side of the absorbent body (56) and both side parts folded back to a back face side of the absorbent body (56) from the intermediate part, distal ends of the both side parts of the wrapping sheet (58) are overlapped on the back face side of the absorbent body (56) to form a connecting portion (58c), a total weight of the high absorbent polymer particles is larger than a total weight of the fibers in the absorbent body (56), and a content rate of the high absorbent polymer particles (56P) of the absorbent body (56) increases stepwise or continuously from the back face side toward the front face side.