Heat modulating food packaging material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microwave cooking technologies face limitations in browning food products due to inadequate heat modulation, often resulting in unsuccessful or overbrowning, highlighting the need for improved heat management in cooking containers.
Innovation Solution
A heat modulating material (HMM) is introduced, comprising a base matrix with particulate material that absorbs radio frequency (RF) energy, allowing for selective heat zone activation through frequency and phase control, enabling both direct and indirect heating methods from a single energy source, such as an RF generator, to achieve desired browning and cooking outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coating material is provided in the container to absorb microwave energy for browning, then browning capability is improved, but control precision deteriorates leading to unsuccessful or overbrowning
Solution Approach 1:
The container is divided into multiple heating zones with different microwave absorption characteristics. Each zone contains specific dielectric particles at controlled concentrations to create distinct heat generation regions, allowing independent control of browning and cooking functions.
Solution Approach 2:
Different regions of the container are assigned different dielectric properties through varying particle concentrations and types. The browning zone has higher dielectric loss tangent for heat generation, while other zones have optimized properties for even cooking, creating localized functional differences.
2Productivity
If microwave energy is used to speed up cooking process, then cooking speed is improved, but heating uniformity deteriorates
Solution Approach 1:
The container creates local variations in microwave absorption by distributing different dielectric particles at different concentrations across various zones. This ensures that each region absorbs microwave energy at appropriate rates for uniform overall heating while maintaining high cooking speed.
Solution Approach 2:
The container uses composite materials combining multiple dielectric particles (such as barium titanate, strontium titanate, calcium titanate) with different electromagnetic properties. This composite structure optimizes microwave energy distribution to achieve both rapid cooking and uniform heating.
3Device complexity
If a single energy source is used for both direct and indirect heating, then device complexity is reduced, but control versatility deteriorates
Solution Approach 1:
A single microwave generator is designed to perform multiple heating functions by controlling which heating zones are activated. The same energy source can provide direct microwave heating to the food, indirect heating through the container walls, or selective browning in specific zones, eliminating the need for separate heating systems.
Solution Approach 2:
The system dynamically controls the activation and power levels of different heating zones based on cooking requirements. The controller can selectively energize specific zones or adjust their intensity ratios to achieve various heating modes (direct, indirect, browning, even cooking) using the same microwave source.
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 HMM enables precise control over heat application, improving browning results and operator experience by allowing for simultaneous direct and indirect heating, ensuring well-cooked and properly browned food products without overbrowning.
Implementation Method 1
The particulate material is configured to absorb at least some of the RF energy provided in a cooking chamber of the oven to transform the RF energy into thermal energy for indirectly heating the food product
Implementation Method 2
Depending on the frequency (and/or phase) of the RF energy being propagated in the cooking chamber, the HMM may be sensitive to the frequency (or phase) of electromagnetic energy and convert a certain frequency of applied energy into thermal energy in the form of heat at the thermally active section of the HMM
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An oven may include a cooking chamber configured to receive a heat modulating material (HMM), a radio frequency (RF) heating system configured to provide RF energy into the cooking chamber, and a cooking controller configured to control the frequency of RF energy provided by the RF heating system into the cooking chamber. The HMM may be configured to contain a food product and may include a thermally active section. The thermally active section may include a base matrix and a particulate material dispersed in the base matrix.