Oven Chamber Coating for Heat-Resistant Nonstick Cleaning
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Solution Overview
Problem
Conventional electric ovens require frequent high-temperature Pyro cleaning to remove contaminants from the inner walls, which is time-consuming and effort-intensive, and existing coatings like Teflon are not durable enough to maintain liquid repellency at high temperatures, leading to sticking issues and increased oven failures.
Innovation Solution
A coating film with a thickness of 0.2 µm to 3 µm, formed using silicon-based or alkyl-based liquid-repellent materials with a silsesquioxane skeleton, applied in multiple layers to ensure durability and maintain liquid repellency, combined with a vibrational cleaning method to remove small droplets and a contaminant collecting portion to prevent oil droplets from adhering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating film with liquid repellency is applied to the inner wall of the oven, then contaminants are easier to remove, but the coating generates harmful gas or loses liquid repellency at high temperatures (250°C or higher)
Solution Approach 1:
The patent changes the material parameters of the coating by using silane-modified polyester resin instead of conventional Teflon, achieving a balance between liquid repellency and heat resistance. The coating maintains its properties at cooking temperatures while still providing contaminant removal benefits.
Solution Approach 2:
The patent uses a composite coating system consisting of silane-modified polyester resin combined with specific additives to achieve both liquid repellency and high-temperature stability. This composite approach allows the coating to withstand Pyro cleaning temperatures without decomposing or losing functionality.
2Productivity
If Pyro cleaning is performed at high temperature (420°C or higher) to remove contaminants, then cleaning effectiveness is improved, but the process takes 2 to 4 hours and increases oven failure risk
Solution Approach 1:
The coating film performs preliminary protection by preventing contaminant adhesion in the first place. This preliminary action reduces the severity and amount of contamination, allowing for quicker and less intensive cleaning cycles while maintaining effectiveness.
Solution Approach 2:
The coating acts as a sacrificial layer that protects the underlying surface. Instead of requiring frequent lengthy Pyro cleaning of the oven walls, the coating absorbs the cleaning stress and can be maintained with shorter, less intensive cleaning cycles.
3Reliability
If the coating film thickness is increased to ensure durability against heat load, then heat resistance is improved, but the liquid repellency effect is reduced
Solution Approach 1:
The patent optimizes the coating thickness parameter to a specific range (0.2-3 µm) where the coating achieves sufficient heat resistance while maintaining liquid repellency. This precise parameter control allows both requirements to be satisfied simultaneously.
Solution Approach 2:
The silane-modified polyester resin creates a surface structure that replicates the desired properties of thicker coatings without actually requiring excessive thickness. The molecular structure of the resin provides both durability and liquid repellency within the optimized thickness range.
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 coating film effectively prevents contaminants from adhering to the oven walls, reduces cleaning time and effort, and lowers the frequency of oven failures by maintaining liquid repellency and durability against high heat, while the vibrational cleaning and contaminant collecting features enhance contamin removal and cleanliness.
Implementation Method 1
a coating film having a predetermined thickness and formed on the cooking chamber inner wall, and having a liquid repellency
Implementation Method 2
a method of forming the coating film having the liquid repellency on the inner wall of the oven
Data Source
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AI summary
Provided is an oven having an improved structure for keeping a cooking chamber clean. The oven includes a main body, a cooking chamber provided inside the main body, a main heater disposed inside the cooking chamber, a fan disposed inside the cooking chamber to circulate air heated by the main heater, a coating film formed on at least a part of a cooking chamber inner wall and having a liquid repellency, and a contaminant collecting portion having a liquid repellency smaller than that of the coating film and provided on the cooking chamber inner wall with which air circulated by the fan collides.