High Frequency Adhesive Bonding Using Electromagnetic Susceptors
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Solution Overview
Problem
Conventional adhesive systems in shoe manufacturing require indirect heating, which can damage materials and is inefficient, as they rely on external heat sources like ovens or steam to cure adhesives between layers.
Innovation Solution
A system using electrically conductive plates and a high frequency generator to create an electric field that heats an adhesive with electromagnetic susceptor materials, such as carbon nanotubes, directly within the adhesive, allowing it to cure without damaging surrounding materials and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect heating methods (ovens, infrared heat, steam) are used to cure adhesive, then the adhesive can be cured to form a bond between layers, but the surrounding material layers are damaged by excessive heat and the process is slow due to poor heat conduction
Solution Approach 1:
The adhesive layer is given special electromagnetic properties by incorporating susceptor materials, making it locally responsive to electromagnetic fields while surrounding materials remain unaffected. This allows selective heating of only the adhesive layer at the bonding interface, curing the adhesive without damaging other material layers.
Solution Approach 2:
Electromagnetic susceptor materials act as an intermediary between the electromagnetic field and the adhesive. These materials absorb electromagnetic energy and convert it to heat, enabling indirect heating of the adhesive through the susceptor medium rather than direct exposure to external heat sources.
2Reliability
If indirect heating through surrounding materials is used, then the adhesive can be cured, but the process is slow and energy inefficient due to poor heat conduction in footwear materials
Solution Approach 1:
The adhesive system becomes self-heating by incorporating electromagnetic susceptor materials that convert electromagnetic energy directly into heat within the adhesive layer. This eliminates the need for external heating sources and heat conduction through surrounding materials, enabling rapid self-curing of the adhesive.
Solution Approach 2:
The conventional thermal conduction mechanism is replaced with electromagnetic energy absorption and conversion. Instead of relying on heat diffusion through materials, the system uses electromagnetic fields to directly energize the susceptor materials in the adhesive, which then generate heat instantaneously for rapid curing.
3Reliability
If indirect heating through surrounding materials is used, then the adhesive can be cured, but excessive energy is required and the process is energy inefficient
Solution Approach 1:
The adhesive system generates its own heat through electromagnetic susceptor materials that convert electromagnetic energy directly into thermal energy at the bonding interface. This self-heating mechanism eliminates energy losses associated with heating large volumes of surrounding materials and improves overall energy efficiency.
Solution Approach 2:
Energy is concentrated locally within the adhesive layer through selective electromagnetic absorption by susceptor materials. This localized energy deposition avoids the energy waste of heating entire assemblies or surrounding materials, significantly reducing total energy consumption for the curing process.
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
This method allows for faster and more energy-efficient bonding of material layers by directly heating the adhesive, preventing damage to surrounding materials and reducing the time and energy needed for the curing process.
Implementation Method 1
The adhesive has an electromagnetic susceptor material that when subjected to the electric field heats the adhesive to an adhesive curing temperature
Data Source
AI summary
A system and method for bonding a first layer of material to a second layer of material includes a first electrically conductive plate, a second electrically conductive plate spaced apart from the first electrically conductive plate. The second electrically conductive plate is electrically grounded. A high frequency generator in electrical communication with the first electrically conductive plate supplies high frequency electrical signals to the first electrically conductive plate. An adhesive applied to one of the first and second layers of material has an electromagnetic susceptor material that when subjected to the electric field heats the adhesive to an adhesive curing temperature to bond the first layer of material to the second layer of material. A clamping mechanism applies pressure to one of the first and second layers of material to maintain contact between the first and second layers until an adhesive cure time has lapsed.