Metalized Fabric Heating Blanket with Carbon Veil Resistive Element
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Solution Overview
Problem
Existing metalized heating blankets are stiff and lack softness, which affects their drapability and loft, and they do not provide efficient or quick heat retention, making them less suitable for applications requiring effective body heat conservation.
Innovation Solution
A heating blanket constructed with a carbon veil material, electrically conductive strips, insulative layers, and an electrical control circuit, where the carbon veil is integrated with a resistive heating portion between layers to create a softer, more efficient heating surface, utilizing a reduced sealing pattern to enhance flexibility and heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional metalized fabric layers are bonded together to form the fabric, then infrared heat reflecting capabilities are provided, but the fabric becomes stiff and not soft to the touch
Solution Approach 1:
The patent uses a composite structure with four distinct layers (clear polyethylene, vaporized aluminum, polyethylene, and spunbond polypropylene) bonded together. This composite material approach provides both the infrared heat reflection from the metalized layer and the softness from the polypropylene layer, resolving the contradiction between heat retention and comfort.
Solution Approach 2:
Each layer of the fabric serves a specific function: the clear polyethylene provides infrared transmission, the vaporized aluminum provides heat reflection, the second polyethylene provides structural support, and the spunbond polypropylene provides softness and comfort. By assigning different local qualities to different layers, the fabric achieves both heat retention and softness simultaneously.
2Loss of energy
If metalized fabric is used for heat retention, then infrared heat reflecting capabilities are improved, but the fabric becomes less flexible and has poor draping characteristics
Solution Approach 1:
The combination of rigid metalized layers with flexible polypropylene layers creates a composite material that balances structural integrity for heat reflection with flexibility for draping. The polypropylene layer specifically contributes to loft and flexibility while the metalized layers provide thermal performance.
Solution Approach 2:
The use of thin film structures for each layer, particularly the flexible spunbond polypropylene layer, allows the fabric to maintain flexibility and conformability despite incorporating rigid metalized heat-reflective layers. The thin film approach prevents excessive stiffness while maintaining functional performance.
3Power
If conventional heating methods are used, then heating capability is provided, but heating efficiency and speed are insufficient
Solution Approach 1:
The heating element utilizes resistive heating where electrical energy is converted to thermal energy through phase transition in the carbon veil material. This provides rapid and efficient heating compared to conventional thermal conduction methods, directly addressing the need for faster heating speed and efficiency.
Solution Approach 2:
The patent replaces conventional thermal heating mechanisms with an electrical heating system using carbon veil and conductive strips. This substitution enables more efficient and controllable heat generation, improving heating speed and efficiency while maintaining the blanket's flexibility and comfort characteristics.
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 provides a softer, more flexible heating blanket with improved heat retention and distribution, enhanced drapability, and increased tearing resistance, while allowing for efficient and consistent heating, addressing the limitations of prior art in terms of stiffness and heat delivery.
Implementation Method 1
current passing from the electrical control circuit to the first and second electrically conductive strips passes through the carbon veil to create heat
Implementation Method 2
metalized material to provide the added benefit of infrared heat reflecting capabilities to better prevent heat loss from a person
Data Source
AI summary
A warming blanket (8) has a metalized fabric exterior layer and a heating element formed from a random fiber carbon veil material (52). A conductive ink layer (56) is deposited onto opposite side edges of the carbon veil material as side rails. Lower conductive strips (58) are attached onto a bottom edge of the carbon veil material. Each lower conductive strip is electrically coupled to a side rail. The lower conductive strips have connecting ends (60) which are spaced from each other so as to accept a connection circuit board. Side conductive strips (62) are coupled to the conductive ink side rails. Electrical current controlled by the connection circuit board is passed through the carbon veil material to create heat.