Polyurethane Foam Insulation for Moisture Management in Apparel
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Solution Overview
Problem
Insulating apparel often traps moisture, leading to heat loss and discomfort in cold environments, as existing waterproof and breathable layers are insufficient for managing heavier perspiration during strenuous activities.
Innovation Solution
The use of a flexible polyurethane foam insulation layer with a moisture vapor transmission rate of approximately 1,150 g/m2/24 hrs, combined with a wind-resistant and breathable shell layer, and an inner lining layer, allows for effective moisture transfer and retention of body heat, while the foam's open-cell structure facilitates quick drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a waterproof outer layer is used to prevent moisture entry, then protection from rain and snow is improved, but moisture vapor transmission is restricted causing perspiration to accumulate
Solution Approach 1:
The patent employs a microporous membrane as the waterproof outer layer that contains pores small enough to block liquid water (rain and snow) while being large enough to permit water vapor molecules to pass through. This porous structure enables simultaneous achievement of waterproofing and breathability, resolving the contradiction between protection from external moisture and transmission of internal moisture vapor.
Solution Approach 2:
The waterproof outer layer is designed with spatially varying properties - the microporous membrane provides different functionality at different scales: macroscopically waterproof while microscopically breathable. This local differentiation of quality allows the same material to perform both functions of blocking liquid water and transmitting water vapor.
2Temperature
If traditional insulating material is used to retain body heat, then thermal insulation is improved, but moisture management capability deteriorates leading to heat loss through trapped moisture
Solution Approach 1:
The patent uses a composite construction combining the microporous waterproof membrane with an insulating layer that has moisture-wicking properties. This composite material system simultaneously provides thermal insulation and active moisture management, preventing the accumulation of trapped moisture that would otherwise conduct heat away from the body.
Solution Approach 2:
The invention extracts the moisture management function from the traditional insulating layer and assigns it to a dedicated microporous membrane layer. This separation of functions allows the insulating material to focus on heat retention while the membrane layer handles moisture vapor transmission, preventing heat loss through trapped moisture.
3Quantity of substance
If breathable material is used to allow moisture vapor escape, then moisture management is improved, but wind protection capability is reduced
Solution Approach 1:
The microporous membrane is engineered with pore sizes that create a physical barrier to wind particles while remaining permeable to water vapor molecules. The porous structure allows selective passage based on particle size - blocking larger wind particles while permitting smaller vapor molecules to escape, thus resolving the contradiction between breathability and wind protection.
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 enhanced comfort and warmth by efficiently managing moisture and maintaining insulation even when saturated, preventing heat loss and reducing the risk of hypothermia or frostbite.
Implementation Method 1
a flexible polyurethane foam insulation layer with a moisture vapor transmission rate of approximately 1,150 g/m2/24 hrs
Implementation Method 2
allows for effective moisture transfer and retention of body heat
Implementation Method 3
a wind-resistant and breathable shell layer
Implementation Method 4
wind-resistant and breathable shell layer
Implementation Method 5
the foam's open-cell structure facilitates quick drying
Data Source
AI summary
Articles of apparel and a method for manufacturing an article of apparel are disclosed. An insulation layer for an article of apparel may include a flexible polyurethane foam. The foam may be generated by polymerization in a pressurizable chamber at a pressure sufficient to prevent the foam from completely filling the chamber. A shell layer may include wind resistant, breathable material. The shell layer may include an outer layer of the article of apparel.