Corrugated-Base Susceptor Structure for Microwave Crisping Uniformity
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Solution Overview
Problem
Microwave ovens often cook food items unevenly and fail to achieve a balanced heating and browning of the crust, particularly for bread and dough-based products like pizzas and pies.
Innovation Solution
A thermally insulated susceptor structure comprising a dimensionally stable base with multiple susceptor layers, where each susceptor layer includes microwave energy transparent areas, enhances heating, browning, and crisping by absorbing, transmitting, or reflecting microwave energy, and providing thermal insulation and ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single susceptor or non-insulated multi-susceptor configuration is used, then the structure is simple, but heating uniformity and crisping effectiveness deteriorate
Solution Approach 1:
The susceptor is divided into multiple separate layers (first susceptor layer and second susceptor layer) positioned on opposite sides of the corrugated base. This segmentation allows each susceptor layer to independently interact with microwave energy, creating more uniform heating patterns throughout the food item and improving overall heating reliability.
Solution Approach 2:
The invention combines multiple materials with different properties: metallic susceptor layers for microwave energy absorption and conversion to heat, corrugated paper or paperboard base for thermal insulation and structural support, and optionally polymer film layers for additional insulation. This composite structure achieves both heating uniformity and crisping effectiveness while managing thermal distribution.
2Temperature
If heat is retained within the food item, then crisping and browning improve, but excessive heat buildup may occur
Solution Approach 1:
The corrugated base provides different thermal characteristics at different locations: the fluted structure creates air pockets that provide thermal insulation between the susceptor layers and the food, while the overall structure allows controlled heat distribution. This local variation in thermal quality enables heat retention where needed while preventing excessive heat buildup through the insulating air gaps in the corrugations.
3Reliability
If moisture is vented from the food item, then crisping improves, but heating efficiency may decrease
Solution Approach 1:
The corrugated base acts as an intermediary structure between the susceptor layers and the food item. The fluted design creates channels and air pockets that facilitate moisture vapor escape from the food while the paper or paperboard material maintains thermal insulation. This intermediary structure enables simultaneous moisture venting for crisping and heat retention for heating efficiency.
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 structure significantly improves the heating, browning, and crisping of food items by maintaining heat within the food and allowing for moisture ventilation, resulting in a more evenly cooked and crispy crust compared to single susceptor or non-insulated multi-susceptor configurations.
Implementation Method 1
Each microwave energy interactive element comprises one or more microwave energy interactive components or segments arranged in a particular configuration to absorb microwave energy
Implementation Method 2
The various structures generally comprise a plurality of components or layers assembled and/or joined to one another in a facing, substantially contacting, layered configuration... to absorb microwave energy
Implementation Method 3
The base generally may provide thermal insulation between the microwave energy interactive element and the heating environment... the base comprises a corrugated paper or paperboard and the structure is a thermally insulated susceptor structure
Implementation Method 4
Each microwave energy interactive element comprises one or more microwave energy interactive components or segments arranged in a particular configuration to absorb microwave energy, transmit microwave energy, reflect microwave energy, or direct microwave energy
Data Source
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Figure 7~9A
AI summary
A thermally insulated susceptor structure comprises a dimensionally stable corrugated base, a first susceptor, and a second susceptor. At least one of the first susceptor and second susceptor may circumscribe one or more microwave energy transparent areas that allow the transmission of microwave energy through the respective susceptor and/or create localized fields that enhance heating, browning and/or crisping of an adjacent food item.