Diaper Buttocks Section Bonding for Skin Comfort
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Solution Overview
Problem
Disposable wearing articles with buttocks-covering sections often have high stiffness due to full-area adhesive bonding, leading to skin irritation, particularly at angulated regions that come into contact with the wearer's skin.
Innovation Solution
The inner and outer sheets in the buttocks-covering section are bonded only along the peripheral surfaces of elastic elements, reducing the bonded area and minimizing stiffness, while the arrangement of elastic elements and adhesive application patterns ensure flexibility and prevent adhesive irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied over the entire area of the inner and outer sheets to bond them together, then the bonding strength is improved, but the stiffness of the sheets becomes relatively high causing skin irritation
Solution Approach 1:
The adhesive bonding is segmented from full-area coverage to localized application only at the peripheral edges of the elastic elements. This segmentation maintains sufficient bonding strength at critical locations while leaving the central and angular regions unbonded, preserving flexibility and preventing skin irritation.
Solution Approach 2:
Different regions of the sheet have different bonding characteristics: the peripheral edges of elastic elements have adhesive bonding for strength, while the central and angular regions remain unbonded to maintain flexibility and comfort against the skin.
2Stability of the object's composition
If adhesive is applied over the entire area of the sheets, then the structural stability is improved, but the flexibility is reduced leading to skin irritation at angulated regions
Solution Approach 1:
The adhesive application is segmented to cover only specific peripheral regions rather than the entire sheet surface. This provides structural stability where needed (at elastic element boundaries) while maintaining flexibility in the angular and central regions that contact the skin.
Solution Approach 2:
The sheet exhibits local quality variations in bonding: peripheral regions have adhesive bonding for stability, while angular and central regions remain flexible and unbonded to accommodate skin movement and prevent irritation.
3Shape
If the lower end section is made angulated to improve appearance, then the aesthetic quality is improved, but the skin irritation is increased due to contact with adhesive-bonded regions
Solution Approach 1:
The angulated lower end section is specifically designed to be unbonded and flexible rather than adhesive-bonded. This local quality difference allows the angular shape to maintain aesthetic appearance while the unbonded nature prevents skin irritation by avoiding adhesive contact.
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 design reduces skin irritation by maintaining low stiffness in the buttocks-covering section and preventing adhesive from contacting the skin, ensuring comfort and effective prevention of lifting or quirking.
Implementation Method 1
the inner sheet and the outer sheet are bonded to each other by adhesive applied to peripheral surfaces of the respective buttocks-covering section elastic elements
Implementation Method 2
a plurality of elastic elements extending in a transverse direction of the wearing article so as to prevent the buttocks-covering section from lifting and/or quirking
Data Source
AI summary
A disposable wearing article including a buttocks-covering section having tensile force sufficient to prevent this section from lifting and/or quirking during use of the wearing article and being free from anxiety that the buttocks-covering section might irritate the wearer's skin even if this section comes in contact with the wearer's skin. In this diaper, a rear waist region includes an inner sheet lying on a skin-facing side, an outer sheet lying on a non-skin-facing side, a rear waist main section facing a front waist region and a buttocks-covering section located below the rear waist main section wherein the buttocks-covering section is provided with a plurality of buttocks-covering section elastic elements in the form of strands extending in a transverse direction at a given distance one from another in a longitudinal direction and, in the buttocks-covering section, the inner sheet and the outer sheet are bonded to each other by adhesive applied to peripheral surfaces of the respective buttocks-covering section elastic elements.