Acoustic Elements With Z-Direction Fiber Orientation
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Solution Overview
Problem
Conventional methods for producing acoustic elements from airlaid mineral fibers result in products with inadequate flatness and structural integrity, requiring high density and additional processing steps like carding, which increase costs and potentially reduce acoustic absorption properties.
Innovation Solution
A process involving the collection of mineral fibers in air, vertical compression, and optional cross-lapping to reorient fibers predominantly in the Z direction, followed by curing and cutting to create a bonded batt with a density of 70 to 200 kg/m3, allowing for a flat and sound-absorbing front face without carding, and enhancing edge strength through targeted fiber orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If carding is used to separate fibers and reject debris to improve flatness, then front face flatness is improved (grade 1 or 2), but structural integrity weakens and density must be increased to over 150 kg/m3
Solution Approach 1:
The patent changes the density parameter from high (>150 kg/m3) to moderate (70-200 kg/m3 range with optimal balance), and modifies fiber orientation parameters by introducing Z-direction component through specific airlaid processes, resolving the contradiction between flatness and structural integrity
Solution Approach 2:
The patent introduces a new dimension (Z-direction fiber orientation) to the traditional XY plane fiber arrangement. By creating fibers with substantial Z-direction components through controlled airlaying, the patent achieves both flatness and structural integrity without requiring high density or carding
2Manufacturing precision
If carding and high density compression are used to improve flatness, then front face flatness is improved, but manufacturing complexity and cost increase due to additional process steps
Solution Approach 1:
The patent extracts and eliminates the carding process from the manufacturing sequence by achieving fiber separation and debris rejection through the airlaid process itself, reducing manufacturing complexity while maintaining flatness
Solution Approach 2:
The airlaid process automatically performs fiber separation, debris rejection, and orientation functions that would otherwise require separate carding and compression steps, making the system self-sufficient and simplifying the overall process
3Strength
If high density (>150 kg/m3) is used to compensate for weaker carded fiber structure, then structural integrity is improved, but acoustic absorption properties are reduced
Solution Approach 1:
The patent optimizes the density parameter to a moderate range (70-200 kg/m3) rather than using high density, and combines this with specific fiber orientation parameters (Z-direction components) to achieve both structural integrity and acoustic absorption
Solution Approach 2:
The patent creates a composite fiber structure with binder and mineral fibers arranged in specific orientations, achieving both strength and acoustic properties through the composite architecture rather than relying on high density alone
4Ease of manufacture
If conventional airlaid process is used without Z-direction fiber orientation, then manufacturing is simpler, but front face flatness is inadequate (grade 3 or 4)
Solution Approach 1:
The patent maintains manufacturing simplicity by using the airlaid process but improves flatness by introducing Z-direction fiber orientation through controlled fiber deposition, adding a dimensional parameter without complicating the process
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 method enables the production of acoustic elements with improved flatness, high sound absorption coefficients (≥0.7), and sufficient edge strength at moderate densities, reducing costs and maintaining acoustic properties while simplifying the manufacturing process.
Implementation Method 1
collecting fibres entrained in air on a travelling collector
Implementation Method 2
collected by applying suction through the collector
Implementation Method 3
vertically compressing the collected fibres
Data Source
AI summary
Acoustic element (1) has a flat, sound-receiving, front face (2) which extends in the XY plane and has a good sound-absorption coefficient, and the element is formed of a bonded batt of air laid mineral fibres having a density of 70 to 200 kg/m3 wherein the fibres extend from the front face (2) and at least through the front half of the thickness of the batt have a Z direction component greater than the Z direction component of conventional air laid products, and the front face of the batt is a cut and abraded face. The element can be made by air laying mineral fibres and binder, reorienting the fibres to provide an increased fibre orientation in the Z direction, curing the binder to form a cured batt and cutting the cured batt in the XY plane into two cut batts and smoothing each cut surface by abrasion to produce a flat face on each cut batt.