Multi-Sided Dry Adhesive Pads for High-Load Reversible Bonding
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Solution Overview
Problem
Conventional pressure-sensitive adhesives (PSAs) face limitations in supporting high loads due to irreversible material processes, lack of reversibility, and difficulty in multiple loading applications, while synthetic gecko-like adhesives have not been successfully developed for macroscopic scales.
Innovation Solution
The development of releasable adhesive devices with two or multiple adhesive pads and a tether component, featuring a 'dry' adhesive pad structure that supports high loads under shear, normal, and multi-mode loadings with minimal separation energy, using a combination of elastic materials and mechanical designs inspired by gecko toe structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pressure-sensitive adhesives are used to achieve strong adhesion, then high load capacity is obtained, but reversibility and multiple loading applications are compromised
Solution Approach 1:
The adhesive system is divided into separate functional components: a reusable backing structure and transferable adhesive elements. This segmentation allows the adhesive to be applied, removed, and reapplied multiple times while maintaining both strong adhesion and reversibility, resolving the contradiction between adhesion strength and reusability
Solution Approach 2:
The adhesive properties are modified by changing the physical state and chemical composition of the adhesive material. The adhesive transitions between a transferable state for application and a bonded state for adhesion, enabling both strong initial bonding and controlled removal for multiple applications
2Strength
If conventional PSAs are designed for high tack to achieve strong bonding, then adhesion capacity is improved, but multiple loading applications become difficult
Solution Approach 1:
The adhesive is extracted from a permanent backing and made transferable, allowing it to be applied to surfaces and then removed cleanly. This extraction enables high initial tack for strong bonding while facilitating easy removal and multiple loading applications without residue or damage
Solution Approach 2:
The adhesive system incorporates dynamic properties that allow it to adapt between different operational states: a tacky state for bonding and a release state for removal. This dynamic behavior enables both strong adhesion and ease of multiple applications by controlling the adhesive's stickiness through environmental or mechanical triggers
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 enable simultaneous adhesion to multiple surfaces, supporting high loads with easy release and repeated use, overcoming the limitations of conventional PSAs and gecko-like adhesive systems by minimizing separation time and energy while maintaining high load capacity.
Implementation Method 1
a planar layer of an elastic material having an adhesive surface on at least one side for adhering to a target surface
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 and related methods that are capable of simultaneously adhering to two or multiple target surfaces of various nature and allow high load capacity, are reusable, easy release and suitable for extended and repeated use.