Elastic Cover With Intermittent Adhesive Stripes for Crotch Flexibility
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Solution Overview
Problem
Existing absorbent articles face challenges in maintaining elasticity in specific regions, such as the crotch area, without causing discomfort or material bunching, while ensuring efficient adhesive application that does not lead to stiffness or sagging.
Innovation Solution
An elastic cover design with intermittent hot melt adhesive stripes for leg elastic bodies, spaced apart to secure attachment without excessive stiffness, combined with reduced adhesive use in the crotch region to maintain flexibility and prevent displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot melt adhesive is applied over the entire lengths of the leg elastic bodies, then the leg elastic bodies are securely attached to the substrate, but the region significantly stiffens
Solution Approach 1:
The adhesive application is segmented into discrete spots rather than continuous coverage. The leg elastic bodies are attached at multiple separated locations along their length, providing secure attachment while leaving gaps that prevent excessive stiffness in the crotch region.
Solution Approach 2:
Different regions of the leg elastic bodies receive different adhesive treatment. The adhesive is applied at specific locations where attachment is needed, while other regions remain adhesive-free to maintain flexibility and comfort in the absorbent core overlapping area.
2Object-generated harmful factors
If not enough hot melt adhesive is applied over certain portions of the lengths of the leg elastic bodies, then the stiffness is reduced, but the leg elastic bodies may be dispositioned from the original position after loading of the absorbent core
Solution Approach 1:
The attachment strategy uses multiple discrete adhesive spots distributed along the leg elastic bodies. This segmentation provides sufficient cumulative attachment strength to prevent displacement while using enough adhesive at each spot to avoid excessive localized stiffness.
Solution Approach 2:
The adhesive spots are strategically positioned at locations that provide optimal attachment before the absorbent core is loaded. This preliminary placement ensures the leg elastic bodies maintain their original position during subsequent loading and wear.
3Ease of operation
If nonwoven materials are provided in relatively high caliper or high basis weight, then functionality such as softness, loftiness and breathability is preserved, but the material may significantly stiffen due to manufacturing needs
Solution Approach 1:
The adhesive application is segmented to avoid continuous coverage over the high-caliper nonwoven material. By using discrete spots rather than continuous adhesive layers, the natural softness and flexibility of the thick nonwoven material are preserved while still achieving adequate attachment.
Solution Approach 2:
The adhesive is applied locally at specific spots rather than uniformly across the entire surface. This localized approach allows the high-caliper nonwoven material to maintain its inherent softness, loftiness, and breathability in regions where adhesive is not applied.
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 provides a comfortable, non-stiffening absorbent article with secure elastic attachment, reducing sagging and red marking risks, while maintaining effective adhesive application efficiency.
Implementation Method 1
a plurality of front leg elastic bodies joined between the outer sheet and the inner sheet and extending from the left front region through the crotch region to the right front region, a plurality of back leg elastic bodies joined between the outer sheet and the inner sheet and extending from the left back region through the crotch region to the right back region, wherein the front and back leg elastic bodies are joined to the outer sheet and inner sheet by a leg elastic adhesive which is a hot melt adhesive applied in slot-die coating
Data Source
AI summary
Disclosed is an elastic cover comprising: an outer sheet, an inner sheet, a plurality of waist elastic bodies joined between the outer and inner sheets and extending transversely substantially parallel to each other, and a plurality of front leg elastic bodies joined between the outer and inner sheets and extending from the left front region through the crotch region to the right front region, a plurality of back leg elastic bodies joined between the outer and inner sheets and extending from the left back region through the crotch region to the right back region, wherein the front and back leg elastic bodies are joined to the outer and inner sheets by a leg elastic adhesive which is a hot melt adhesive applied in slot-die coating provided in a plurality of stripes intermittent in the longitudinal direction for joining the leg elastic bodies.