Four-Layer Textile Composite for Moisture Management
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Solution Overview
Problem
Existing multi-layer composite materials for underlay and formwork applications lack enhanced water vapor absorption and controlled water release capabilities, which are crucial for efficient moisture management in roofing constructions.
Innovation Solution
A four-layer textile composite material is developed, featuring a hydrophilic microfine meltblown layer between two spunbonded nonwoven layers and a microporous film, allowing for high water vapor absorption and temporary storage, with the microporous film enabling controlled release of stored water, while maintaining waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a microporous film is used to make the composite material waterproof, then liquid impermeability is improved, but water vapor permeability deteriorates
Solution Approach 1:
The composite material is divided into multiple functional layers: a microporous film layer for liquid barrier function, a hydrophilic meltblown layer for water vapor absorption, and spunbonded nonwoven layers for structural support. This segmentation allows each layer to specialize in one function, resolving the contradiction between liquid impermeability and water vapor permeability.
Solution Approach 2:
The invention uses a composite structure combining microporous film, hydrophilic meltblown material, and spunbonded nonwoven fabric. The microporous film provides liquid barrier properties while the hydrophilic meltblown layer absorbs water vapor, creating a composite material that simultaneously achieves both liquid impermeability and water vapor permeability.
2Quantity of substance
If a hydrophilic meltblown layer is added to absorb water vapor, then moisture absorption capacity is improved, but device complexity increases
Solution Approach 1:
The invention merges multiple functions into a single integrated composite material structure. The hydrophilic meltblown layer is combined with the microporous film and spunbonded nonwoven layers to create a multi-functional material that provides both liquid barrier and moisture absorption capabilities in one component, reducing the need for separate systems.
Solution Approach 2:
The composite material structure serves multiple functions simultaneously: the microporous film layer provides liquid barrier protection, the hydrophilic meltblown layer absorbs and stores water vapor, and the spunbonded nonwoven layers provide structural support. This multi-functionality allows a single material system to handle both waterproofing and moisture management.
3Quantity of substance
If the meltblown layer is made highly absorbent with fiber thickness of 0.5 to 6 μm, then water vapor absorption is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a fiber thickness range of 0.5 to 6 μm for the meltblown layer, optimizing the balance between absorption capacity and manufacturability. This parameter range ensures sufficient surface area for water vapor absorption while remaining within achievable manufacturing tolerances for meltblown processes.
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 material effectively absorbs and temporarily stores water vapor, releasing it in a controlled manner, enhancing moisture management and durability in roofing applications.
Implementation Method 1
the meltblown is made hydrophilic in such a way that its fluid absorption capacity is many times its own weight
Implementation Method 2
Water that passes through this layer in the form of vapor or liquid is absorbed by the meltblown. The liquid is temporarily stored there.
Implementation Method 3
The microporous film is moisture vapor permeable but waterproof, creating a protective barrier against liquids. Liquid or water vapor can penetrate through the first fleece layer.
Data Source
AI summary
The invention relates to a multi-layer composite material, particularly a sarking membrane and/or formwork strip, made of a four-layered textile. Two layers are formed by spunbonded nonwovens, wherein the first spunbonded nonwoven layer forms the first outside or bottom of the composite material. A center layer is a micro-fine, high-density but water vapor-permeable meltblown layer with a hydrophilic finish, such that the liquid absorption capacity thereof is many times its own weight. One layer is a microporous film, wherein the opposite second outside or top of the composite material is formed by a second spunbonded nonwoven layer. The meltblown is arranged directly between the first spunbonded nonwoven layer and the microporous film.