Ultra-fine Mineral Wool Insulation with Parallel Fiber Orientation
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Solution Overview
Problem
Current mineral fiber insulation products, such as glass wool, have thermal conductivities that are not sufficiently low for optimal thermal insulation without increasing product thickness, which is not suitable for building applications.
Innovation Solution
The development of mineral wool insulation products with fibers having a micronaire less than 10 l/min, specifically between 3 and 6 l/min, and containing reflective and/or absorbent infrared elements, arranged with at least 75% of fibers parallel to the major extensions, achieving a thermal conductivity of less than 30 W/M.K, and a density of at most 35 kg/m³, allowing for a softer and more manipulable product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional mineral fiber products are used, then the product provides thermal insulation, but the thermal conductivity is not sufficiently low (0.032-0.040 W/M.K) for optimal insulation without increasing thickness
Solution Approach 1:
The patent applies parameter changes by reducing fiber diameter from conventional 3-6 μm to ultra-fine 1-2 μm (micronaire <10 l/min), and by orienting fibers parallel to the product surface rather than randomly. These parameter changes reduce thermal conductivity to <0.030 W/M.K while maintaining reasonable thickness for building applications.
Solution Approach 2:
The patent creates a composite structure by combining ultra-fine mineral fibers with infrared-reflective elements (such as aluminum particles or multilayer reflective barriers). This composite approach addresses the thermal conductivity limitation by adding a reflective component that reduces radiative heat transfer, achieving superior insulation performance without increasing thickness.
2Loss of energy
If fiber diameter is reduced to improve thermal insulation, then thermal conductivity decreases, but manufacturing complexity increases due to the need for precise control of fiber formation parameters
Solution Approach 1:
The patent simplifies manufacturing by establishing specific parameter ranges for ultra-fine fiber production: burner pressure 300-700 mmH2O, centrifuge speed 1800-2500 rpm, and melt delivery 10-20 tons/day. These defined parameters make the complex process of producing 1-2 μm fibers controllable and repeatable in industrial settings.
Solution Approach 2:
The patent replaces mechanical fiber cutting methods with a chemical-mechanical fusion process where melted glass is extruded through a centrifuge and solidifies into ultra-fine fibers during extrusion. This substitution eliminates the need for separate cutting operations and enables direct production of the desired fiber diameter.
3Loss of energy
If fibers are oriented parallel to improve thermal resistance, then thermal insulation performance increases, but handling and installation difficulty increases due to fiber alignment requirements
Solution Approach 1:
The patent changes the fundamental parameter of fiber orientation from random (conventional) to parallel alignment. By controlling fiber formation and deposition processes, fibers are laid down parallel to the product surface during manufacturing, creating inherent thermal barriers that improve insulation performance while the finished product maintains ease of handling.
Solution Approach 2:
The patent performs preliminary fiber orientation during the manufacturing process itself, rather than requiring post-manufacturing alignment. The parallel fiber arrangement is established when the product is formed, so that installation and handling occur with the fibers already in their optimal thermal configuration, eliminating additional alignment steps.
4Ease of operation
If product density is reduced to improve manipulability, then ease of handling increases, but thermal conductivity increases reducing insulation effectiveness
Solution Approach 1:
The patent decouples the relationship between density and thermal conductivity by changing fiber diameter and orientation parameters. Ultra-fine 1-2 μm fibers with parallel orientation achieve low thermal conductivity (<0.030 W/M.K) at low density (≤35 kg/m³), breaking the conventional trade-off where lower density means higher conductivity.
Solution Approach 2:
The patent utilizes porous material principles by creating a product with low density (≤35 kg/m³) through ultra-fine fiber formation. The porous structure formed by the fine fibers provides thermal insulation through reduced solid conduction paths while maintaining low weight and high manipulability for easy installation.
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
This approach results in improved thermal insulation performance, enabling efficient thermal resistance in reasonable thicknesses, facilitating easier handling and installation, and allowing the product to be compressed for transport while maintaining its nominal thickness.
Implementation Method 1
introducing a melted glass net into a centrifuge, also called fibration plate, turning at high speed and pierced at its periphery by a very large number of orifices by which the glass is projected in the form of filaments under the effect of the centrifugal force
Implementation Method 2
These filaments are then subject to the action of an annular stretch current at high temperature and speed which is produced by a burner and which runs along the wall of the centrifuge, current which thinks and transforms them into fibers
Implementation Method 3
A binder necessary to bind the fiber in a woolly product is sprayed on the fibers while they are drawn towards the reception device
Implementation Method 4
The accumulation of fibers on the reception device under the effect of the suction provides a carpet of fibers
Data Source
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AI summary
A thermal insulation product based on mineral wool, characterized in that the fibres have a micronaire of less than 10 l/min, preferably less than 7 l/min and especially between 3 and 6 l/min, that the product includes infrared absorbent and/or reflective elements, and in that the product has a thermal conductivity of less than 30 mW/m.K.