Fire-Retardant Multi-Layer Edge Material for Sandwich Panel Protection
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Solution Overview
Problem
Conventional edge strips for sandwich panels lack sufficient fire protection and resistance to point loads, and existing solutions are either too heavy, complex, or aesthetically unsuitable for applications like aviation and furniture construction.
Innovation Solution
A fire-retardant edge material composed of multiple bonded layers, featuring a non-metallic first and second layer with a metal core layer in between, which can be applied as a continuous roll and provides enhanced resistance to fire and point loads while maintaining a lightweight and aesthetically pleasing appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional edge strips are used for protecting sandwich panel edges, then ease of manufacture and aesthetic appearance are improved, but fire protection and resistance to point loads are insufficient
Solution Approach 1:
The edge material combines a metal core layer (aluminum or aluminum alloy) with non-metallic outer layers (plastic, laminate, or veneer) to create a composite structure that simultaneously provides fire resistance, mechanical strength against point loads, and aesthetic appearance. This composite approach resolves the contradiction by integrating materials with complementary properties rather than using a single conventional material.
Solution Approach 2:
The invention uses a layered structure where the metal core layer is nested between two non-metallic outer layers. This nested configuration allows the metal layer to provide fire protection and structural strength while the outer layers provide aesthetic appearance and protection, thereby achieving multiple functions simultaneously and resolving the contradiction between ease of manufacture and fire protection.
2Ease of manufacture
If conventional edge strips are used for protecting sandwich panel edges, then ease of manufacture and aesthetic appearance are improved, but resistance to point loads is insufficient
Solution Approach 1:
The metal core layer (aluminum or aluminum alloy) is specifically chosen for its high strength-to-weight ratio and excellent resistance to point loads and dents. When combined with the non-metallic outer layers, this creates a composite edge material that maintains ease of manufacture while dramatically improving resistance to mechanical damage from point loads.
Solution Approach 2:
The metal core layer is strategically positioned within the edge material structure to provide localized strength where it is most needed - at the edges of sandwich panels that are susceptible to point load damage. This local quality approach allows the edge material to have different properties at different layers, with the metal providing strength where required.
3Strength
If thicker metal layers are used to increase resistance to penetration for point loads, then strength is improved, but weight and processing complexity increase significantly
Solution Approach 1:
The composite structure with a metal core layer between non-metallic outer layers provides high resistance to penetration and point loads while keeping the overall weight low. The metal layer thickness can be optimized to the minimum required for strength, and the lighter non-metallic outer layers complete the structure without adding significant weight, thus resolving the contradiction between strength and weight.
Solution Approach 2:
By changing the structural parameters from a single thick metal layer to a multi-layer composite with optimized thickness distribution, the invention achieves the required resistance to penetration with reduced overall weight. The metal core layer thickness is optimized for strength while the outer layers provide additional protection without significant weight penalty.
4Reliability
If plastics edges with desired fire resistance are used, then fire protection is improved, but they cannot be produced as rolled goods and require separate cutting and matching, increasing device complexity and loss of time
Solution Approach 1:
The edge material combines a metal core layer with non-metallic outer layers to achieve fire resistance comparable to or exceeding that of plastics edges. The metal layer provides inherent fire resistance while the composite structure allows for continuous production as rolled goods, eliminating the need for separate cutting and matching operations.
Solution Approach 2:
The invention enables continuous production of fire-resistant edge material in rolled form, allowing for uninterrupted application to sandwich panel edges. This continuous production method eliminates the discontinuous cutting and matching operations required for plastics edges, thereby reducing device complexity and manufacturing time.
5Reliability
If plastics edges are used to meet fire resistance requirements, then fire protection is improved, but they show on the panel surface under finish or decorative layer after longer period of time, worsening aesthetic appearance
Solution Approach 1:
The non-metallic outer layers (plastic, laminate, or veneer) of the composite edge material are selected to match the aesthetic requirements of the panel surface. These outer layers are applied over the metal core and can be made to closely match the appearance of the panel's finish or decorative layer, preventing visual showing while maintaining fire resistance.
Solution Approach 2:
The outer layers of the edge material are specifically designed and selected to match the local aesthetic requirements of the panel surface where they are applied. This local quality approach allows the edge material to have different properties at different layers, with the outer layers providing aesthetic matching to the panel finish while the metal core provides fire resistance.
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 edge material effectively protects sandwich panels from fire and mechanical damage, meeting aviation and fire-protection regulations while being easy to apply and maintain, with improved thermal insulation and reduced weight, ensuring high-quality visual appearance and durability.
Implementation Method 1
the core layer has a higher fire resistance than the first and the second layer, so that said core layer contributes in particular to the fire-retardant behaviour of the edge material
Implementation Method 2
an edge material constructed from a plurality of bonded layers
Data Source
AI summary
The invention relates to an edge material for panels, the edge material being constructed from a plurality of bonded layers. The edge material comprises a first layer, which is non-metallic, and a core layer, which is made of at least one metal layer. The edge material also comprises a second layer, which is non-metallic. Furthermore, the invention relates to a corresponding sandwich panel and to a corresponding cover layer for panels.