Surface Fastener Head Area Optimization for Peel Strength
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Solution Overview
Problem
Existing surface fasteners lack sufficient peel strength, which is essential for enhancing the performance and value of surface-fastener products, particularly in applications like diapers where both male and female surface fasteners are required to have high engagement forces.
Innovation Solution
A surface fastener made of synthetic resin with a thin-plate-shaped base portion and engaging elements, where each engaging element has a stem portion protruding upward and an engaging head portion with a head portion area of 22000 μm² or greater and 50000 μm² or less, arranged in specific patterns to optimize engagement and disengagement with a female surface fastener.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the head portion area of engaging elements is increased to enhance peel strength, then the engaging strength improves, but the surface fastener requires larger dimensions which may affect product design flexibility
Solution Approach 1:
The patent applies parameter changes by precisely controlling the head portion area within the range of 22000-50000 μm² and the stem portion height within 150-300 μm. This optimization of geometric parameters achieves the balance between peel strength and dimensional constraints, resolving the contradiction between strength improvement and area limitation.
2Strength
If the stem portion height is increased to improve engagement force, then the peel strength enhances, but the overall height of the surface fastener increases which may affect comfort and fit
Solution Approach 1:
The patent optimizes the stem portion height parameter within the specific range of 150-300 μm to achieve adequate engagement force while controlling the overall height. This parameter optimization resolves the contradiction between improving peel strength and maintaining acceptable dimensions for comfort and fit.
3Strength
If the engaging element density is increased to enhance peel strength, then the engagement force improves, but the arrangement complexity and difficulty of manufacturing increase
Solution Approach 1:
The patent applies local quality by creating distinct zones with different engaging element densities: a first region with higher density and a second region with lower density. This spatial variation in local properties optimizes peel strength while managing manufacturing complexity through region-specific design rules.
Solution Approach 2:
The patent segments the surface fastener into multiple regions with different engaging element arrangements. By dividing the fastener into a first region and a second region with distinct density characteristics, the patent simplifies the manufacturing process while achieving optimized overall performance.
Data Source
AI summary
In a surface fastener in plan view seen from above the engaging elements, when an area of an engaging head portion of one of the engaging elements is defined as a head portion area, the head portion area of each of the engaging elements is 22000 μm2 or greater and 50000 μm2 or less. According to the surface fastener, it is possible to obtain a large peel strength with respect to a female surface fastener.