Perforated Foam Composite Fabric for Breathable Insulated Apparel
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Solution Overview
Problem
Existing breathable and buoyant, cold-resistant, and waterproof fabrics are cumbersome, lack moisture vapor transmission, and require specialized handling, limiting their adoption in the textile industry.
Innovation Solution
A breathable composite fabric comprising a perforated expanded low density polyethylene foam layer mechanically attached to nonwoven facing layers, providing micro-perforations for breathability while maintaining water resistance, and being suitable for conventional textile manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If foamed materials are used for thermal insulation, then thermal insulation is improved, but the garment becomes thick and cumbersome
Solution Approach 1:
The patent uses expanded polyethylene foam with a specific cellular structure that provides thermal insulation through trapped air pockets while maintaining a thin profile. The foam's porous structure allows heat resistance without requiring excessive material thickness, directly resolving the contradiction between thermal insulation and garment bulk.
Solution Approach 2:
The invention combines expanded polyethylene foam with a waterproof breathable membrane and outer fabric layers to create a composite insulation system. This multi-layer composite achieves superior thermal insulation in a thinner overall construction compared to traditional single-material approaches, addressing both insulation and thickness concerns.
2Object-affected harmful factors
If waterproof materials are used, then water resistance is improved, but moisture vapor transmission is reduced
Solution Approach 1:
The waterproof breathable membrane incorporates microporous structures that are smaller than water droplets but larger than water vapor molecules. This allows the membrane to block liquid water while permitting vapor transmission, resolving the contradiction between water resistance and breathability through selective permeability based on pore size.
Solution Approach 2:
The membrane's permeability characteristics are optimized by controlling pore size, pore distribution, and hydrophobicity parameters. By adjusting these parameters, the material achieves simultaneous waterproofing and vapor transmission capabilities, directly addressing the contradiction between water resistance and moisture vapor transmission.
3Weight of moving object
If buoyant materials are used, then buoyancy is improved, but the garment becomes bulky and cumbersome
Solution Approach 1:
The expanded polyethylene foam provides buoyancy through its cellular structure that traps air pockets, creating positive buoyancy without requiring excessive material volume. The foam's low density and high compressibility allow it to provide sufficient buoyant force while maintaining a compact, non-bulky garment construction.
Solution Approach 2:
The buoyant foam layer acts as a counterweight to the wearer's body weight in water, providing flotation capability. By strategically placing thin layers of buoyant material in key areas rather than uniformly throughout the garment, the design achieves necessary buoyancy while minimizing overall bulk and maintaining mobility.
4Manufacturing precision
If specialized handling processes are used, then manufacturing precision is improved, but ease of manufacture is reduced
Solution Approach 1:
The fabric is constructed as separate layers (outer fabric, membrane, foam insulation) that can be manufactured independently using conventional processes, then assembled through standard lamination or stitching techniques. This segmentation allows each layer to be optimized separately with conventional equipment while simplifying the overall manufacturing process compared to integrated specialized processes.
Solution Approach 2:
The expanded polyethylene foam serves multiple functions simultaneously: thermal insulation, buoyancy, and structural support. This multi-functionality reduces the need for additional specialized layers or processes, allowing conventional textile manufacturing equipment to handle the entire production process while maintaining high fabric quality.
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 composite fabric offers lightweight, high thermal insulation, buoyancy, and comfort with improved breathability and water resistance, suitable for various apparel applications, including ice fishing suits, without the bulkiness of previous solutions.
Implementation Method 1
The intermediate layer is a perforated foam layer, specifically, expanded low density polyethylene foam
Implementation Method 2
providing micro-perforations for breathability while maintaining water resistance
Implementation Method 3
a breathable composite fabric comprising a perforated expanded low density polyethylene foam layer
Data Source
AI summary
A composite fabric comprises perforated expanded low density polyethylene foam that is mechanically attached to two opposing facing layers, at least one of which outer facing layers is a non-woven material. The mechanical attachment of the perforated expanded low density polyethylene foam layer to the outer facing layers may be through stitching or quilting; through adhesive; or through thermal bonding. The composite fabric provides a textile with exceptional buoyancy, cold-resistant and water-resistant properties and which can be easily handled by conventional textile manufacturing processes.