Microwave Reflector Bottom Wall for Uniform Heating
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Solution Overview
Problem
Microwave cooking often leads to localized superheating of food components, resulting in rapid vaporization and potential expulsion of food from containers, due to insufficient reflection of microwave radiation at the bottom of the container.
Innovation Solution
Incorporating a microwave reflector that covers at least 80% of the bottom wall of the container, which is effective in reducing localized superheating by reflecting microwave radiation and promoting uniform heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microwave radiation is passed through food to heat it quickly, then cooking efficiency is improved, but localized superheating occurs causing food expulsion
Solution Approach 1:
The patent applies a microwave reflector material to the bottom surface of the container that converts the harmful localized superheating effect into a beneficial uniform heating effect. The reflector material with specific dielectric properties (loss tangent between 0.01-0.1 at 2.45 GHz) redirects microwave energy to create more uniform heat distribution across the food, preventing the harmful superheating at the bottom while maintaining efficient cooking.
2Temperature
If a reflector is added to the bottom of the container to reduce superheating, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The container bottom is designed with multi-functionality by integrating the microwave reflector material directly into the bottom surface. This single component serves both as the container bottom structure and as the microwave energy redirecting element, eliminating the need for separate reflector components and reducing overall device complexity while achieving uniform heating.
Solution Approach 2:
The patent modifies the dielectric parameters of the container bottom material itself, using materials with specific loss tangent values (0.01-0.1 at 2.45 GHz) to achieve microwave reflection. By changing the material parameters rather than adding structural components, the solution achieves heating uniformity without increasing 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 use of a microwave reflector significantly reduces localized superheating near the bottom of the container, preventing food expulsion and ensuring more uniform heating, as demonstrated by reduced temperature gradients and microwave activity scores in various experiments.
Implementation Method 1
The bottom wall can include a microwave reflector. The microwave reflector covers at least about 80 percent of the surface area of the bottom wall
Implementation Method 2
Water, fat, and other substances in the food absorb energy from the microwaves in a process called dielectric heating
Data Source
AI summary
Embodiments of the invention include food products and related methods. In an embodiment, the invention includes a food product. The food product can include a container and a food composition. The container can include a bottom wall and a side wall. The bottom wall can include a microwave reflector. The side wall can include a material that is substantially transparent to microwaves. The microwave reflector can cover at least about 80 percent of the surface area of the bottom wall. In an embodiment, the invention includes a microwaveable food container. The microwaveable food container can include a bottom wall and a side wall. The bottom wall can include a microwave reflector. The side wall can include a material that is substantially transparent to microwaves. The microwave reflector can cover at least about 80 percent of the surface area of the bottom wall. Other embodiments are also included herein.