Microwave Reflective Panel With Stretched Metallic Fabric
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Solution Overview
Problem
Existing microwave oven glazing solutions compromise optical transparency and aesthetic appeal due to the use of metallic grids for microwave shielding, making it difficult for users to see the interior and giving a negative connotation to combination ovens.
Innovation Solution
A microwave absorbing and/or reflecting panel with a rigid, transparent support and a stretched metallic fabric that is tensioned between 0.01 and 5% of its resting state, providing improved optical transparency and aesthetic appearance while maintaining effective microwave shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic grid is used for microwave shielding, then microwave reflection is improved, but optical transparency deteriorates
Solution Approach 1:
The patent changes the physical parameters of the metallic fabric by stretching it to reduce mesh size from typical larger dimensions to between 120-220 μm, while maintaining the conductive properties for microwave shielding. This parameter modification allows the fabric to block microwaves effectively while becoming sufficiently fine to maintain optical transparency.
Solution Approach 2:
The invention creates a composite structure by integrating the stretched metallic fabric with a transparent rigid support (glass or plastic). This composite approach combines the microwave shielding capability of the metal fabric with the optical transparency of the support material, resolving the contradiction between shielding effectiveness and visibility.
2Reliability
If a metallic grid is used for microwave shielding, then microwave reflection is improved, but aesthetic appearance deteriorates
Solution Approach 1:
Stretching the metallic fabric to reduce mesh size transforms its visual appearance from a coarse grid pattern to a fine, nearly invisible texture. This parameter change maintains the shielding function while dramatically improving aesthetic appearance by making the fabric less visually prominent.
Solution Approach 2:
The metallic fabric is applied selectively to the transparent support, creating a localized shielding layer that is optimized for both function and appearance. The fabric's fine mesh structure provides shielding where needed while maintaining the overall aesthetic quality of the transparent panel.
3Illumination intensity
If mesh size is reduced to improve optical transparency, then visibility is improved, but manufacturing complexity increases
Solution Approach 1:
Rather than manufacturing custom fine-mesh fabrics, the patent achieves fine mesh dimensions (120-220 μm) by stretching commercially available metallic fabric. This parameter transformation approach simplifies manufacturing by using standard materials and processes while achieving the required fine mesh structure for transparency.
Solution Approach 2:
The manufacturing process incorporates a dynamic element by stretching the fabric during installation. This dynamic approach allows a single fabric material to serve multiple functions and achieves the fine mesh structure through mechanical transformation rather than complex manufacturing, reducing overall device complexity.
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 enhances visibility and aesthetic appeal of microwave ovens by maintaining microwave reflection properties while ensuring the panel remains transparent in the visible range, addressing the limitations of existing technologies.
Implementation Method 1
a microwave absorbing and/or reflecting panel, a glazing comprising such a panel... maintaining effective microwave shielding... maintaining microwave reflection properties
Implementation Method 2
The means of shielding the glazing comprises or consists of a network of conductors forming a mesh... which enables about 90% of the microwaves generated in the oven chamber to be reflected
Data Source
AI summary
A panel for glazing including a rigid support, substantially transparent to radiation in the visible range, and including at least one surface, including a periphery, and one or more edges, the panel includes a metallic fabric stretched over the at least one surface. Also, a glazing including such a panel, a sealing device of a heat treatment chamber including such a glazing, a heat treatment device using microwaves including such devices, and methods for producing the panel, the glazing, the sealing device and the heat treatment device.