Releasable Adhesive Pad Structure With Adjustable Load Angles
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Solution Overview
Problem
Conventional pressure-sensitive adhesives (PSAs) face limitations in supporting high loads and repeated use due to irreversible material processes, and lack adjustable weight-bearing angles and easy release mechanisms, while gecko-like adhesives are challenging to replicate on macroscopic scales.
Innovation Solution
The development of unique releasable adhesive devices with adjustable weight-bearing angles, utilizing 'T-pad' adhesive pads connected to stiff tethers via rotatable hinges, allowing for high load-bearing capacity and easy release, without relying on viscoelastic properties or surface fibrillar structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pressure-sensitive adhesives are used to achieve strong bonding, then adhesion strength is improved, but load-bearing capacity and reusability deteriorate due to irreversible material processes
Solution Approach 1:
The adhesive device is segmented into multiple functional components: adhesive pads, tether components, and hinge components. This segmentation allows the adhesive pads to be replaced independently, enabling reusability while maintaining strong bonding performance. The adhesive pads can be detached and reattached without compromising the structural integrity of the entire device.
Solution Approach 2:
The invention changes the material parameters by using elastomeric materials with specific elastic moduli (0.1-10 MPa for adhesive pads, 1-100 MPa for tether components). These parameter adjustments enable the material to exhibit both strong adhesion and elastic recovery, allowing repeated use while maintaining load-bearing capacity. The viscoelastic properties are optimized to balance bonding strength and reversibility.
2Strength
If conventional adhesives provide high tack for strong bonding, then adhesion strength is improved, but ease of release deteriorates due to irreversible bonding processes
Solution Approach 1:
The adhesive device incorporates dynamic elements including rotatable hinges and flexible tethers that allow the adhesive pads to adjust their orientation and maintain contact under varying loads. The elastomeric materials provide dynamic elastic recovery, enabling easy release and reattachment while maintaining strong bonding during use. The system transitions between static bonding and dynamic release states.
3Stability of the object's composition
If fixed-angle adhesive devices are used for weight-bearing applications, then structural stability is improved, but adaptability to different applications deteriorates
Solution Approach 1:
The invention replaces fixed-angle structures with dynamic rotatable hinges that allow the adhesive device to adjust its weight-bearing angle from 0° to 180°. The hinges maintain structural stability through controlled rotation while enabling adaptability to different mounting orientations and load directions. This dynamic adjustment capability allows a single device to serve multiple applications.
Solution Approach 2:
The adhesive device is designed as a universal system that can function in multiple orientations and configurations. The rotatable hinges and flexible tethers enable the same device to be used in vertical, horizontal, and angled positions, making it suitable for diverse applications including shelving, mounting, and load-bearing structures across industrial, medical, and military uses.
4Reliability
If gecko-like adhesive systems are replicated on macroscopic scales, then reversibility and dry adhesion are improved, but manufacturing complexity and cost deteriorate
Solution Approach 1:
Instead of replicating complex gecko-like microstructures, the invention changes the approach by using macroscopic elastomeric materials with optimized elastic moduli. This parameter-based solution achieves reversibility and dry adhesion through material properties rather than microscopic structural complexity, significantly simplifying manufacturing while maintaining the desired functional performance.
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
These devices provide high-load bearing, easy release, and adjustable weight-bearing capabilities, suitable for various applications, including industrial, medical, and military uses, while maintaining stability and cost-effectiveness.
Implementation Method 1
PSAs typically rely on ubiquitous surface force interactions, such as van der Waals forces, to transfer stress across an interface
Implementation Method 2
PSAs exhibit viscoelastic (viscous and elastic) properties, both of which may be used for creating proper bonding
Data Source
AI summary
The invention provides unique releasable adhesive devices that are high-load bearing and highly stable while allowing adjustment of the weight-bearing angle in a wide range, thereby greatly expanding the scope of applications for technology. Adhesive systems and devices of the invention can be designed to fit applications ranging from household weight-bearing shelves and holders, components for transportation, athletic equipment, labels and advertising posts, automobile interior trims, permanent or reversible fasteners, as well as instruments and devices for industrial, commercial, medical or military applications.