Expanded Metal Oven Rack Coating for Heat and Cleaning
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Solution Overview
Problem
Conventional oven racks are complex to manufacture, prone to discoloration at high temperatures, and difficult to clean due to food deposits, which affect their appearance and functionality.
Innovation Solution
An oven rack constructed from an expanded metal sheet with a frame and braces, providing a simpler manufacturing process, enhanced heat distribution, and the option for coatings to protect against discoloration and food residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional racks use elongated rods welded together in a grid-like manner, then the racks provide structural support and allow air flow, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The rack is divided into multiple modular units, each comprising a metal sheet with integrated openings and supporting elements. These modular units can be manufactured separately and then assembled, simplifying the overall manufacturing process while maintaining structural integrity and air flow characteristics.
Solution Approach 2:
The invention changes the fundamental parameter of rack construction from welded rods to metal sheets with formed openings. This parameter change simplifies manufacturing by eliminating welding operations while maintaining the necessary structural support and air flow properties through controlled opening patterns in the sheets.
2Temperature
If racks are exposed to very high temperatures during cooking and cleaning, then the cooking function is achieved, but the racks discolor in a manner that is displeasing to the user
Solution Approach 1:
The rack employs a coating layer that can be applied to the metal sheet surface. This coating serves as a sacrificial protective layer that withstands high temperature exposure and prevents discoloration of the underlying metal, maintaining appearance even under extreme cooking and cleaning conditions.
Solution Approach 2:
The rack structure combines metal sheets with protective coating materials to create a composite construction. The metal provides structural strength while the coating material resists thermal discoloration, creating a multi-material solution that addresses both structural and aesthetic requirements under high temperature exposure.
3Ease of operation
If food is deposited on the racks during use, then the cooking function is fulfilled, but the deposits are difficult to remove during cleaning and may leave undesirable discoloration
Solution Approach 1:
The protective coating on the metal sheets serves as a non-stick surface that prevents food deposits from bonding strongly to the rack structure. This coating acts as a release layer that makes food residue easier to remove during cleaning, reducing both cleaning difficulty and permanent discoloration.
Solution Approach 2:
The surface properties of the rack are modified through coating application, changing the surface energy and friction characteristics. This parameter change creates a smoother, less adhesive surface that resists food deposit accumulation and facilitates easier cleaning, while the underlying metal structure maintains its cooking functionality.
Data Source
AI summary
An oven rack constructed from an expanded or punched metal is provided. The oven rack can be coated with one or more coatings to e.g., protect the metal from discoloration or damage, and/or to provide certain properties to the surface of the rack that may be desirable for cooking operations. An oven appliance incorporating such an oven rack is also provided.