Vented Susceptor Structure for Microwave Crisping
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Solution Overview
Problem
Microwave ovens inadequately heat and crisp food items like sandwiches and bread-based products due to uneven cooking, lacking the desired balance of thorough heating and browning.
Innovation Solution
A microwave heating construct with two partially joined panels and apertures that includes a susceptor layer to convert microwave energy into thermal energy, facilitating moisture venting and enhanced browning and crisping, potentially mimicking grill marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional microwave heating is used, then heating convenience is improved, but heating uniformity and crisping capability deteriorate
Solution Approach 1:
The susceptor is divided into multiple discrete elements arranged in a grid pattern, creating distinct heating zones that correspond to different food regions. This segmentation allows differential heating across the food surface, enabling simultaneous heating, browning, and crisping in different areas while maintaining overall heating uniformity.
Solution Approach 2:
Different regions of the susceptor are designed with varying properties - some areas have higher susceptor material density or different geometric configurations to create localized high-heat zones for crisping and browning, while other areas provide gentler heating. This local quality variation resolves the contradiction by providing both uniform overall heating and localized intensive heating where needed.
2Temperature
If microwave energy is converted to thermal energy uniformly, then thorough heating is improved, but browning and crisping capability deteriorates
Solution Approach 1:
The susceptor incorporates regions with different microwave absorption characteristics - some areas are designed to convert more microwave energy to thermal energy for thorough heating, while other areas are optimized for higher temperature generation to enable browning and crisping. This spatial variation in energy conversion efficiency resolves the contradiction between uniform heating and localized high-temperature effects.
Solution Approach 2:
The susceptor uses composite material structures combining different microwave-interactive materials with complementary properties. One material component provides broad-spectrum microwave absorption for uniform heating, while another component enhances localized heat generation for browning and crisping. The composite structure enables simultaneous achievement of thorough heating and surface browning/crisping.
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 construct effectively browns and crisps food items by efficiently converting microwave energy into heat and removing moisture, achieving superior heating and crisping compared to conventional microwave cooking methods.
Implementation Method 1
the panel includes a susceptor or susceptor layer, i.e., a thin layer of microwave energy interactive material that tends to absorb at least a portion of impinging microwave energy and convert it to thermal energy
Implementation Method 2
The apertures cooperate with the unjoined area to assist with the transport or venting of moisture away from the food item to enhance the browning and/or crisping of the food item
Data Source
Figure 1A~1C
Figure 1D~1F
Figure 1G~1I
AI summary
A microwave heating construct comprises a first panel and a second panel, each comprising a microwave energy interactive material. The panels are partially joined to one another in an opposed, facing relationship such that an unjoined area is defined between the first panel and the second panel. The unjoined area is in communication with an open peripheral edge of the construct. The first panel includes an aperture in communication with the unjoined area between the first panel and the second panel.