Fastening device, method of production and fastening system thereof
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Solution Overview
Problem
Existing fastening devices using hook-and-loop systems are costly and require large installation space due to the need for high-strength connections and complex plate-like structures, which increases production costs and reduces functional reliability.
Innovation Solution
A fastening device with 100 to 200 interlocking elements per cm², featuring hair-like stem parts with a small cross-sectional widening at the head, providing enhanced adhesion and flexibility, and a carrier part made of woven fabric or 3D film, allowing for reduced material usage and improved adhesion through various geometric arrangements and functional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plate-like hook-and-loop fastener parts are used to ensure high-strength connections, then connection strength is improved, but installation space and device complexity increase
Solution Approach 1:
The fastening device is segmented into numerous individual interlocking elements (100-200 per cm²) with hair-like stem parts and head parts, distributed across a carrier part. This segmentation allows the fastening function to be achieved through many small elements rather than large plate structures, reducing installation space while maintaining connection strength through cumulative engagement.
Solution Approach 2:
The interlocking elements exhibit local quality variations with hair-like stem parts having small diameters (150-250 μm) and head parts with slightly larger diameters (200-400 μm). This localized structural variation optimizes engagement at specific points while keeping overall material usage minimal, achieving high connection strength without requiring large installation space.
2Reliability
If complex plate-like structures with web-like projecting latching parts are used, then connection reliability is improved, but production costs and device complexity increase
Solution Approach 1:
The invention extracts the essential fastening function from complex plate-like structures with web-like latching parts, reducing the design to simple interlocking elements with stem parts and head parts. This extraction maintains connection reliability through the interlocking mechanism while eliminating unnecessary structural complexity and reducing production costs.
Solution Approach 2:
Instead of using large plate structures with projecting latching parts that engage from the front, the invention inverts the approach by using numerous small interlocking elements that engage through their head parts catching on loop pile fabric. This inversion simplifies the structure while maintaining or improving connection reliability.
3Strength
If high density of interlocking elements (100-200 per cm²) with long stem parts (1200-2200 μm) is used, then adhesion force is improved, but material usage increases
Solution Approach 1:
The stem parts are designed as flexible hair-like elements with small diameters (150-250 μm) that can bend and conform to the engagement surface. This flexibility allows long stem parts (1200-2200 μm) to provide sufficient adhesion force while using minimal material, as the thin, flexible structure engages effectively with loop pile fabric without requiring excessive material volume.
Solution Approach 2:
The invention optimizes the density parameter to 100-200 interlocking elements per cm², which provides sufficient adhesion force through cumulative engagement while controlling material usage. The stem part length is optimized to 1200-2200 μm to achieve the required engagement depth without excessive material consumption, balancing adhesion force with material efficiency.
Data Source
AI summary
A fastening device has a plurality of individual spaced-apart interlocking elements made of a plastics material, each of which projects towards one side from a carrier part by being provided with a stem part and a head part. The number of interlocking elements is 100 to 200 pieces per cm2, preferably 120 pieces per cm2. The diameter of the stem part of an interlocking element is 150 to 250 μm, preferably 213 μm. The height of the interlocking element, calculated from the root-side base on the carrier part to the head-part end, is 1200 to 2200 μm, preferably 1500 to 1980 μm. The dimension of the largest head-part diameter of an interlocking element is 200 to 400 μm, preferably 220 to 290 μm.