Expanded Metal Safety Cabinet Wall with Abrasive Resin
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Solution Overview
Problem
Current safety enclosures, while resistant to mechanical and thermal attacks, require enhanced systems for specific applications to improve their efficiency against these threats.
Innovation Solution
A wall or partition design incorporating a solid steel sheet with folded edges, fiber panels, and a layer of expanded metal steel, which is embedded in a resin layer with abrasive particles, providing excellent mechanical and thermal resistance through a multi-layered assembly with secure connections and air-filled chambers to deter drilling attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered structure with expanded metal and resin is added to enhance protection against drilling attacks, then the resistance to mechanical attacks is improved, but the device complexity increases
Solution Approach 1:
The patent employs a composite structure combining expanded metal mesh with resin matrix material to create a drilling-resistant layer. The expanded metal provides structural framework while the resin binds abrasive particles and fills spaces, creating a material that resists drilling tools through abrasion and deformation rather than simple penetration resistance.
Solution Approach 2:
The expanded metal layer is strategically positioned between the outer steel sheet and inner panels at locations most susceptible to drilling attacks. The mesh structure with specific aperture sizes (5-20mm) creates localized resistance zones that force drilling tools to encounter repeated abrasion and deformation, while other parts of the structure maintain their original functions.
2Temperature
If the resin layer is designed to withstand high temperatures above 180°C, then the resistance to thermal attacks is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The resin material is selected and formulated with specific thermal parameters including glass transition temperature (Tg) and softening point both exceeding 180°C. This parameter selection ensures the resin maintains its structural properties and bonding strength under thermal attack conditions, preventing the layered structure from delaminating or deforming during fire scenarios.
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 solution achieves superior resistance to mechanical and thermal attacks, meeting stringent criteria like EN 1143-1, by utilizing the expanded metal's deformation and abrasive properties to weaken drilling tools and maintain structural integrity under high temperatures.
Implementation Method 1
the area left free allows the expanded metal to deform when it comes into contact with the drilling tool, thus creating in cases of aggression, a bead opposing the movement of the drilling tool
Implementation Method 2
a layer of flattened expanded metal with an apparent thickness of 2 to 6mm... comprising a resin, advantageously of the epoxy or epoxy type, loaded at least with abrasive particles with a particle size of less than 2 mm, in particular of less than 1 mm, and having a hardness over 1 mm Mohs scale greater than 8, in particular greater than 9
Implementation Method 3
The resin will be chosen so as to be able to withstand high temperature, for example temperatures above 180 ° C., or even 250 ° C. for more than 1 hour, or even much more. The resin can also be of the polyimide and / or polyamide type.
Implementation Method 4
a first substantially solid steel sheet with a thickness of between 2 and 5mm and the side edges of which are folded to define a bowl with a bottom, said folded side edges being advantageously welded to each other
Data Source
Figure 1
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Figure 4~5A
AI summary
Paroi ou cloison pour une enceinte sécurisée comprenant au moins une couche de métal déployé en acier (40) d'épaisseur apparente comprise entre 2 et 20mm, avec un maillage avec une diagonale courte (41) de 10 à 40mm, sur une diagonale longue (42) de 15 à 80mm, défini par des lanières (43) de largeur comprise entre 2 et 10mm.