CNT Edge Heater for Localized Demagnetization and Bond Weakening
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Solution Overview
Problem
Current techniques for removing or disabling vehicle-attached devices like IEDs or trackers require physical contact and are dangerous, necessitating the development of a localized, high-temperature, and high-pressure solution that can be applied from a safe distance.
Innovation Solution
An edge heater using a CNT network layer with a resistive heating sheet, thermally conductive material, and asymmetrical shape to provide localized high heat, capable of demagnetizing rare earth magnets and weakening adhesive bonds, powered by rechargeable batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If brute force techniques are used to remove vehicle-attached devices, then physical contact and leverage are achieved, but personnel safety deteriorates due to proximity requirements
Solution Approach 1:
The patent replaces mechanical brute force removal techniques with a thermal field-based approach. A localized heater applies intense heat to the adhesive bonds and magnetic attachments, causing thermal degradation of the bonding mechanisms. This substitution eliminates the need for physical contact and leverage, allowing operators to remove devices from a safe distance while maintaining effective removal capability through thermal energy rather than mechanical force
2Temperature
If localized high-temperature heating is applied to demagnetize rare earth magnets, then magnet pull strength is reduced, but energy consumption increases
Solution Approach 1:
The patent implements localized heating that concentrates thermal energy only at the specific target area where the device is attached to the vehicle. The heater is positioned to apply heat precisely to the adhesive bonds and magnetic attachments without heating large surrounding areas. This localized approach significantly reduces total energy consumption compared to heating entire surfaces, while still achieving the necessary temperature (750°F for at least 30 minutes) to demagnetize rare earth magnets and degrade adhesive bonds
Solution Approach 2:
The heating process is applied in controlled time intervals, specifically maintaining 750°F for at least 30 minutes to achieve the required thermal degradation. This periodic, time-controlled heating approach optimizes energy usage by applying heat only for the necessary duration to achieve demagnetization and adhesive degradation, rather than continuous heating
3Temperature
If conventional heaters are used to heat large surfaces, then uniform heating is achieved, but localized heating effectiveness deteriorates
Solution Approach 1:
The patent employs a localized heater design that concentrates heating capability on a small, specific area rather than distributing heat across a large surface. The heater is sized and positioned to apply intense thermal energy precisely to the device attachment point, achieving both high temperature (750°F) and sustained duration (30+ minutes) in the target zone. This localized approach maintains heating uniformity within the small treatment area while maximizing productivity through focused thermal degradation of adhesives and magnets
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 edge heater effectively increases the surface temperature to 750°F for at least 30 minutes, reducing the pull strength of Neodymium magnets by 50% and weakening adhesive bonds, enhancing warfighter safety by allowing safer removal of IEDs.
Implementation Method 1
a resistive heater layer... the resistive heating sheet provides an electrically-conductive pathway from the first to the second electrical lead
Implementation Method 2
a thermally conductive material layer disposed on one side of the resistive heating sheet in a constriction region
Data Source
AI summary
An edge heater comprised of a resistive heating sheet having an edge that is relatively hot because the edge is located close to a constriction in the electrical pathway through the resistive heating sheet. The resistive heating sheet can be made with carbon nanotubes (CNTs). Methods of heating objects using the edge heater and methods of making the edge heater are also described.