Surface Fastener Peel Strength and Texture Optimization
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Solution Overview
Problem
Surface fasteners used in wearable products, such as disposable diapers and diaper covers, require a stable peel strength to prevent separation during body movement and need to improve the texture of the surface where the engaging elements are arranged to ensure a soft feel against the skin.
Innovation Solution
A surface fastener made of a synthetic resin with a flat plate-shaped base portion and a plurality of engaging elements, each comprising a stem portion, an engaging head portion, and at least one engaging pawl portion protruding from the outer circumference of the engaging head portion, with a total area of engaging head portions per 1 cm² of 10,000,000 μm² or more and a tensile modulus of 700 MPa or more and 2300 MPa or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the total area of engaging head portions is increased to improve peel strength, then the engagement strength with loop member improves, but the texture of the surface fastener deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the total area of engaging head portions within a specific range (5,000,000 to 15,000,000 μm² per 1 cm²) and the resin tensile modulus (700 to 2300 MPa). This optimization ensures sufficient peel strength while maintaining acceptable texture quality, resolving the contradiction between engagement strength and surface comfort.
2Strength
If the formation density of engaging elements is increased to improve peel strength, then the engagement strength with loop member improves, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the formation density of engaging elements by controlling the total area parameter rather than simply increasing density. This approach achieves sufficient peel strength through optimized engagement geometry and resin properties, avoiding the need for excessive element density that would complicate manufacturing processes.
3Strength
If the tensile modulus of synthetic resin is increased to improve peel strength, then the engagement strength with loop member improves, but the texture softness deteriorates
Solution Approach 1:
The patent resolves this contradiction by specifying an optimal tensile modulus range (700 to 2300 MPa) for the synthetic resin. This parameter optimization ensures the resin provides sufficient structural support for high peel strength while maintaining the softness required for comfortable skin contact, preventing both excessive rigidity and insufficient strength.
Data Source
AI summary
To provide a surface fastener capable of stably ensuring an appropriate peel strength with respect to a loop member and capable of improving texture as compared with a conventional surface fastener. A surface fastener is made of a synthetic resin and includes: a base portion; and a plurality of engaging elements. Each of the engaging elements includes a stem portion, an engaging head portion, and at least one engaging portion protruding from an outer circumference portion of the engaging head portion. A total of the areas of the engaging head portions per 1 cm2 of the surface fastener is 10,000,000 μm2 or more when the surface fastener is viewed in plan view from above. The synthetic resin has a tensile modulus of 700 MPa or more and 2300 MPa or less.