Multidirectional Fuse Susceptor for Microwave Heating
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Solution Overview
Problem
Conventional microwave energy interactive structures, such as susceptors, tend to overheat and suffer from crazing or shrinking due to random current flow, leading to diminished heat generation and premature failure, especially when exposed to high power levels without uniform food loads.
Innovation Solution
A microwave energy interactive structure with a layer of interactive material and strategically arranged microwave energy transparent areas, forming interconnected shapes like hexagonal loops and cross-shaped elements, which create a resonant effect for uniform power distribution and limit random current flow, thereby preventing overheating and crazing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional plain susceptor film is used, then microwave energy can be converted into thermal energy for heating food items, but the susceptor film may overheat at one or more regions and cause crazing or shrinking due to random current flow
Solution Approach 1:
The susceptor film is segmented into multiple discrete microwave energy interactive elements arranged in a pattern, rather than using a continuous plain film. This segmentation limits the pathways for random current flow, preventing concentration of current in specific regions and thereby preventing overheating, crazing, and shrinking of the susceptor material.
Solution Approach 2:
Different regions of the susceptor structure are given different properties - some areas contain microwave energy interactive material while other areas are transparent or inactive. This creates localized zones of controlled current flow and heat generation, preventing random current distribution and the associated overheating problems.
2Adaptability or versatility
If the susceptor is used in a package without a uniform food load, then heating can still occur, but the susceptor film may overheat and cause crazing or shrinking
Solution Approach 1:
The segmented structure with discrete interactive elements ensures that even when food load is non-uniform, the microwave energy is distributed across multiple separated zones. This prevents any single region from absorbing excessive energy and overheating, maintaining reliability under varying load conditions.
Solution Approach 2:
The pattern of transparent or inactive areas, which might seem to reduce overall heating capability, actually serves to protect the susceptor from overheating by limiting current flow pathways. This converts a potential weakness (reduced continuous heating area) into a benefit (protected against overheating and crazing).
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 achieves uniform heating and crisping of food items while being less susceptible to overheating and premature failure, allowing it to withstand higher power levels and maintain effectiveness over a longer period.
Implementation Method 1
The susceptor is operative for converting microwave energy into thermal energy (i.e., heat), which then can be transferred to an adjacent food item
Implementation Method 2
The interconnected shapes are dimensioned to create a resonant effect in the presence of microwave energy. The resonant effect of the interconnected shapes provides uniform power distribution and, therefore, uniform heating, across the structure
Data Source
AI summary
A microwave energy interactive structure includes microwave energy interactive material supported on a microwave energy transparent substrate, and a plurality of spaced apart microwave energy transparent segments circumscribed by the microwave energy interactive material. The plurality of spaced apart microwave energy transparent segments define a pattern of loops that may be dimensioned to induce resonance of microwave energy during microwave heating of a food item on the structure. The structure may also include a plurality of microwave energy transparent elements that are operative as fuses to prevent overheating of the structure.