Double-Sided Adhesive Sheet Voltage-Controlled Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing double-sided adhesive sheets struggle to efficiently separate adherends, particularly those that are difficult to elastically bend or deform, such as rigid or fragile members, without causing bending deformation during peeling, which is challenging in manufacturing and recycling processes.
Innovation Solution
A double-sided adhesive sheet with a laminate structure including a first and second adhesive layer and a conduction substrate, where the adhesive layers contain an electrolyte, allowing for voltage application to generate a potential difference and reduce adhesion force, enabling separation without bending deformation by altering the adhesive layer's surface composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a peeling operation by bending and deforming the adherend is performed to separate adherends joined by a double-sided adhesive sheet, then the separation can be achieved with smaller force for flexible adherends, but the operation is insufficient for rigid members, fragile members, or plastically deformable members that cannot be appropriately bent or deformed
Solution Approach 1:
The invention changes the physical-chemical state of the adhesive layer by applying voltage, transforming it from a static adhesive bond to a dynamically controllable interface. The electrolyte's ion migration under electric field alters the adhesive properties in real-time, enabling separation without mechanical deformation of the adherends.
Solution Approach 2:
The invention replaces the mechanical peeling operation (bending and deforming adherends) with an electrical field action. Instead of applying mechanical force to deform adherends for separation, an electric field is applied to the adhesive layer to induce ion migration and reduce adhesion force, thereby achieving separation without mechanical stress on the adherends.
2Strength
If conventional double-sided adhesive sheets are used to join rigid members, fragile members, or plastically deformable members, then strong adhesion can be achieved, but separation becomes difficult without causing bending deformation or damage to the adherends
Solution Approach 1:
The invention makes the adhesive bond dynamic rather than static. The adhesive layer's properties can be changed in real-time by applying voltage, allowing the system to transition from a strong bonded state (no voltage) to a separable state (voltage applied). This dynamic control enables both strong joining and easy separation without damage.
Solution Approach 2:
The electrolyte in the adhesive layer acts as an intermediary that mediates between the electrical field and the adhesive bond. When voltage is applied, the electrolyte's ion migration serves as the intermediate mechanism that reduces adhesion force, enabling separation without direct mechanical action on the adherends.
3Productivity
If a double-sided adhesive sheet with certain peelability is used to enable rework or recycling, then separation can be achieved for flexible adherends, but the same approach fails for adherends that cannot be elastically bent or deformed
Solution Approach 1:
The invention replaces mechanical peeling operations with electrical field action, enabling rework and recycling of rigid and fragile members that cannot withstand mechanical deformation. The electrical field induces ion migration in the electrolyte-containing adhesive layer, reducing adhesion force and enabling separation without mechanical stress.
Solution Approach 2:
The invention changes the physical-chemical parameters of the adhesive layer through voltage application, transforming the adhesive bond from a permanent state to a temporarily modifiable state. This parameter change enables efficient separation for rework and recycling applications across diverse adherend types including rigid and fragile members.
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 solution allows for efficient separation of adherends without the need for peeling operations, even when one or both adherends are difficult to bend or deform, by reducing the adhesion force through electrolyte orientation changes in response to applied voltage, facilitating easier disassembly in manufacturing and recycling.
Implementation Method 1
When a potential difference in a thickness direction of the adhesive layer is generated, for example, by applying voltage, an orientation variation or movement in a layer thickness direction occurs in the electrolyte in the adhesive layer
Data Source
AI summary
A double-sided adhesive sheet has a laminate structure including a first adhesive layer containing an electrolyte, a second adhesive layer, and a conduction substrate. A double-sided adhesive sheet joined body includes, for example, an adhesive sheet having such a laminate structure, a first conductive adherend to which the first adhesive layer adheres, and a second adherend to which the second adhesive layer adheres. A method for joining/separating adherends includes joining first and second adherends to each other via the adhesive sheet, then applying a voltage to the first adhesive layer so as to generate a potential difference in a thickness direction of the first adhesive layer, and separating the first and second adherends from each other.