Microwave Food Container With Metallic Ink Coating
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Solution Overview
Problem
Microwave ovens often result in non-uniform heating of food, limiting their use for cooking gastronomic meals due to uneven temperature distribution, which reduces their popularity for cooking certain types of food.
Innovation Solution
A food container with a metallic ink coating and strategically designed openings on its structural walls, allowing controlled microwave penetration to achieve uniform heating across multiple compartments, with the metallic ink comprising silver bits and a binder, and a substrate supporting both the ink and decorative layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete metallic ink coating is applied to the container, then microwave shielding is improved, but microwave penetration is completely blocked preventing food heating
Solution Approach 1:
The metallic ink coating is designed with a porous structure containing openings that allow microwave energy to pass through while maintaining overall shielding effectiveness. The coating is not completely solid but has controlled porosity to enable selective microwave transmission.
Solution Approach 2:
The metallic ink coating has non-uniform properties with varying coverage density and opening distribution across different regions. The coating density and opening size are locally adjusted to control microwave transmission characteristics in different areas of the container.
2Speed
If microwave ovens are used for cooking, then heating speed is improved, but temperature uniformity deteriorates resulting in non-uniform heating
Solution Approach 1:
Different compartments or regions of the container have metallic ink coatings with different opening densities and sizes. This creates localized variations in microwave transmission that compensate for the non-uniform heating pattern inherent in microwave ovens, achieving more uniform temperature distribution.
Solution Approach 2:
The physical parameters of the metallic ink coating (opening size, opening density, coating thickness) are varied across different regions to modify microwave transmission characteristics. By changing these parameters locally, the container optimizes energy distribution to achieve uniform heating.
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 container ensures uniform temperature distribution within the food by regulating microwave energy, allowing for precise cooking of different food items in separate compartments, enhancing the usability of microwave ovens for a variety of meals.
Implementation Method 1
the openings having a selected dimension to allow a given amount of microwaves to pass therethrough to reach the food item in the compartment
Data Source
AI summary
A food container for microwave use comprises at least one compartment for receiving a food item, the container portion having a structural wall defining the lateral sides of the container portion. The structural wall is made of a polymer. A label is secured to the structural wall and covers continuously the lateral sides of the container portion. The label has an inner surface against the structural wall and an outer surface oriented away from the structural wall. The label comprises a substrate defining the outer surface of the label and a metallic ink defining partly the inner surface of the label. The metallic ink defines a continuous coating on the label with openings. The openings have a selected dimension to allow some microwaves to pass therethrough to reach the food item in the compartment. A method for fabricating a food container for microwave use is also provided.