Touch-and-Close Fastener Heads for Low-Resistance Interlocking
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Solution Overview
Problem
Existing adhesive fastener components with mushroom-shaped locking heads experience increased penetration resistance and require high manufacturing costs due to the need for specially matched surfaces and components, leading to unreliable interlocking actions.
Innovation Solution
A method involving the use of polyamide or polyester plastic material to form loops with convex and concave interlocking surfaces, where the convex top surface transitions into a concave surface seamlessly, allowing for high shear strengths without radial overhang, and producing interlocking elements with symmetrical or asymmetrical head shapes for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mushroom-shaped locking heads with large radial projection are used, then adhesive strength is improved, but penetration resistance increases and interlocking reliability deteriorates
Solution Approach 1:
The invention applies local quality by creating distinct surface zones on the locking head: a convex upper surface for low-friction sliding engagement and a concave lower surface for high-strength interlocking. This localized differentiation allows the head to provide both easy engagement and reliable retention without requiring large radial projection.
2Strength
If specially matched surfaces and individual components are used, then connection strength is improved, but manufacturing cost increases
Solution Approach 1:
The invention merges the functions of multiple specially matched components into a single integrated locking head structure. The convex-concave surface configuration combines engagement and retention functions in one element, eliminating the need for separately matched components while maintaining high connection strength and reducing manufacturing complexity.
3Strength
If large interlocking heads are used, then adhesive strength is improved, but penetration resistance increases causing unwanted contact without interlocking
Solution Approach 1:
The invention uses curvature strategically: the convex upper surface provides a rounded sliding interface that guides engagement with low resistance, while the concave lower surface creates a cup-like geometry that securely captures the mating element. This curved surface design enables penetration with minimal resistance while ensuring reliable interlocking.
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 method achieves high shear and peel strengths with reliable interlocking, preventing unwanted slippage and damage to adjacent materials, while maintaining cost-effectiveness and ease of integration into other fastener systems.
Implementation Method 1
heating the loop ends with a predeterminable temperature and heating time until a head shape forms as a thickening at the respective loop end under the surface tension of the plastic material
Implementation Method 2
by the application of thermal energy – provided the functional thread is made of a plastic material – causing the cut ends of the locking elements to form mushroom-shaped locking heads
Data Source
Figure 1
Figure 2~5
Figure 6~9
AI summary
The invention relates to a method for producing a touch-and-close fastener part, containing at least the following steps: producing a base structure (10) from a thread system having individual loops which are at least partly made of polyamide plastic material or polyester plastic material, cutting open at least some of the loops to form two stem-like loop ends, heating the loop ends with a specifiable temperature and with a specifiable heating time until, under the surface tension of the plastic material, a head shape (18) arises as a thickened portion at each loop end, and forming the head shape (18) with a convex top (22), which transitions, at the location of a line-shaped transition (28), into a concave hooking surface (24), the concave hooking surface being seamlessly transitioned into the adjoining stem-like loop end for a hooking element (6).