Limited conduction heat reflecting materials
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Solution Overview
Problem
Conventional heat-reflecting materials compromise breathability by reducing moisture vapor transmission, leading to discomfort and increased heat loss through heat conduction when in contact with the skin.
Innovation Solution
Incorporating heat-reflecting elements and spacer elements, such as vertically oriented fibers, into a base material to maintain heat reflection while preventing direct contact with the skin and underlying surfaces, thereby enhancing insulation and breathability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-reflecting materials are used to improve insulation, then heat reflection is improved, but moisture vapor transmission is reduced
Solution Approach 1:
The patent introduces breathable spacer elements as intermediary components between the heat-reflecting material and the skin. These spacers are made of breathable material that allows moisture vapor to pass through while maintaining the heat-reflecting properties of the underlying material, thus resolving the contradiction between heat reflection and moisture vapor transmission
2Temperature
If heat-reflecting materials are placed in direct contact with skin to improve insulation, then heat reflection is improved, but heat conduction away from skin increases
Solution Approach 1:
The breathable spacer elements serve as a mediating layer between the heat-reflecting material and the skin. This intermediary layer prevents direct thermal contact while allowing the heat-reflecting material to function, thereby reducing unwanted heat conduction away from the body
Solution Approach 2:
The patent segments the insulation structure into distinct functional layers: a heat-reflecting layer and a breathable spacer layer. This segmentation allows each layer to perform its specific function optimally - the heat-reflecting layer reflects thermal radiation while the spacer layer provides thermal break and moisture vapor transmission pathways
3Loss of substance
If breathable spacer elements are added to maintain moisture vapor transmission, then breathability is improved, but device complexity increases
Solution Approach 1:
The breathable spacer elements perform multiple functions simultaneously: they provide thermal break to reduce heat conduction, maintain moisture vapor transmission for breathability, and provide mechanical separation between layers. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall system complexity
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 combination of heat-reflecting and spacer elements in the base material significantly increases insulation value by up to 250% over the base material alone, while maintaining high moisture vapor transmission rates, effectively trapping heat and reducing heat conduction.
Implementation Method 1
Materials that provide improved insulation by reflecting body heat towards the body surface of a wearer
Implementation Method 2
contact between heat-reflecting materials and the skin can undesirably allow the heat-reflecting materials to conduct body heat away from the skin
Implementation Method 3
Such a reduction in moisture vapor transmission may cause the fabric to become damp
Data Source
AI summary
Disclosed are insulating materials, and in particular materials that offer improved insulation properties without compromising breathability. The insulating materials may include a base material having a moisture vapor transfer rate (MVTR) of at least 2000 g/m2/24 h (JIS 1099 A1); a plurality of heat-reflecting elements coupled to a first side of the base material, each heat-reflecting element having a heat-reflecting surface and being positioned to reflect heat towards an underlying surface; and a plurality of spacer elements coupled to the first side of the base material, each spacer element sized and shaped to reduce contact of the heat-reflecting elements with the underlying surface.