Microwave heating package with polarized shield
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Solution Overview
Problem
Microwave ovens often result in uneven heating of larger food items, where some parts become overcooked and dry while others remain underheated due to inconsistent microwave energy distribution.
Innovation Solution
A microwave heating construct featuring a tray and cover with strategically positioned microwave energy interactive elements, such as metal foil or high optical density materials, that reflect excess microwave energy away from the periphery and direct it to the center to achieve uniform heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional microwave heating is used without energy redistribution, then heating speed is fast, but heating uniformity deteriorates with peripheral regions overheating and center regions underheating
Solution Approach 1:
The patent introduces microwave energy interactive elements as intermediary components between the microwave field and the food item. These elements (reflectors, absorbers, or susceptors) mediate the energy distribution by reflecting excess energy from peripheral regions and directing it toward the geometric center, thereby achieving more uniform heating without fundamentally changing the microwave oven structure.
Solution Approach 2:
The patent applies different microwave energy interactive elements at different locations on the package. Peripheral regions are equipped with reflectors or absorbers to reduce excessive heating, while the geometric center may have susceptors or different reflector configurations to enhance heating. This local differentiation of heating characteristics resolves the uniformity issue.
2Temperature
If microwave energy is concentrated at the geometric center to prevent underheating, then center heating improves, but peripheral regions become overcooked and dry
Solution Approach 1:
The patent converts the harmful excessive microwave energy that would normally cause peripheral overheating into a beneficial resource by using reflector elements to redirect this excess energy toward the geometric center. The harmful over-heated microwave energy at the periphery is transformed into useful heating energy for the underheated center region.
Solution Approach 2:
The patent implements location-specific microwave energy interactive elements where peripheral regions have reflectors or absorbers to reduce heating, while the geometric center has susceptors or reflector arrangements to concentrate heating. This local quality differentiation ensures the center receives adequate heating without causing peripheral damage.
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 ensures that the geometric center of the food item is uniformly heated, preventing overheating and underheating, thereby improving the overall heating efficiency and uniformity of microwave-cooked food.
Implementation Method 1
the at least first microwave energy interactive element reduces heating along the peripheral region of the food item when the at least first microwave energy interactive element is exposed to microwave energy
Implementation Method 2
Microwave ovens commonly are used as a convenient means of heating food items
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3~4
AI summary
A microwave heating package with a polarized shield includes a tray and a cover and at least one microwave energy interactive element. The microwave energy interactive element is dimensioned and arranged to extend along a peripheral region of a food item in an interior of the tray. The microwave energy interactive element reduces heating along the peripheral region of the food item when the microwave energy interactive element is exposed to microwave energy. The tray and the lid of the construct can each include at least one microwave energy interactive element.