High-Density Mechanical Fastener Caps for Soft Peel Engagement
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Solution Overview
Problem
Existing mechanical fasteners used in disposable absorbent articles have high shear strength but low peel strength, leading to a tactile experience that can be uncomfortable and difficult to distinguish between fastening and non-fastening sides, and they often require high material density for effective engagement.
Innovation Solution
A mechanical fastener with upstanding fastening elements having a high pin density (1000-5000/cm²) and large caps (20-70% cap area) that are spaced apart, providing a soft tactile feel and effective engagement with loop materials, with caps shaped as circular, oval, or regular polygons, and a thermoplastic backing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical fasteners have high pin density for effective engagement, then engagement strength is improved, but tactile comfort deteriorates and the fastening side becomes distinguishable from non-fastening side
Solution Approach 1:
The patent applies local quality by creating caps with varied heights on the fastening elements. The caps have different heights (e.g., first caps at a first height, second caps at a second height) which creates a more uniform and softer tactile surface while maintaining effective engagement strength through the distributed cap structure.
Solution Approach 2:
The patent applies preliminary action by pre-forming the caps with varied heights during the molding process. This preliminary structuring of the fastening element surfaces creates an inherently softer tactile feel before engagement occurs, eliminating the need for post-processing while maintaining engagement effectiveness.
2Strength
If mechanical fasteners have high material density for effective engagement, then engagement strength is improved, but material usage increases
Solution Approach 1:
The patent applies segmentation by dividing the fastening element surface into multiple caps of varying heights rather than using a uniform dense structure. This segmentation allows effective engagement through the distributed cap architecture while reducing overall material consumption compared to traditional high-density uniform structures.
Solution Approach 2:
The patent applies parameter changes by varying the height parameter of caps across the fastening element surface. This parameter variation (different cap heights) maintains engagement effectiveness while optimizing material distribution and reducing total material usage compared to uniform high-density structures.
Data Source
Figure 1~2
AI summary
A mechanical fastener is described that includes a thermoplastic backing and multiple upstanding fastening elements having posts with proximal ends integrally formed with the thermoplastic backing and distal ends comprising spaced-apart caps larger in cross-section area than a cross-sectional area of the posts. The multiple upstanding fastening elements are present in a density in a range from 1000 per square centimeter to 5000 per square centimeter, and a sum of the cross-sectional area of the spaced-apart caps is in a range from 20 to 70 percent of an area of the mechanical fastener. The spaced-apart caps are circular, oval, or regular polygonal having at least five sides and do not have a dimension greater than 300 micrometers. A fastening laminate and an absorbent article including the mechanical fastener are also described.