Microwave Susceptor with Insulating Cells for Crust Browning

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Solution Overview

Problem

Microwave ovens inadequately cook dough-based food items, failing to achieve uniform heating and a browned, crisp crust.

Innovation Solution

The development of microwave energy interactive insulating structures comprising layers with a susceptor and expandable cells, featuring apertures that convert microwave energy into thermal energy and provide thermal insulation, enhancing heating, browning, and crisping by creating localized electric fields and venting moisture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If microwave energy is used to heat dough-based food items, then heating convenience is improved, but heating uniformity and crust quality deteriorate

Engineering Contradiction:

Improveheating convenienceVSAvoidheating uniformity

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The susceptor layer is segmented into multiple zones with different microwave absorption properties, including high-absorption zones for intense heating and low-absorption zones for gentler heating, enabling different regions of the food to be heated at different rates for uniform overall heating

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the susceptor are given different properties: some regions have high microwave absorption for crust browning and crisping, while other regions have lower absorption for maintaining moisture and providing gentle heating, allowing simultaneous achievement of crust quality and interior heating uniformity

Inventive Principle:

Principle #3Local quality

2Speed

If microwave energy is used to heat dough-based food items, then heating speed is improved, but crust browning and crisping deteriorate

Engineering Contradiction:

Improveheating speedVSAvoidcrust temperature

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The susceptor contains localized high-absorption regions that concentrate microwave energy at specific points to generate intense localized heat for crust browning and crisping, while other regions provide gentler heating to prevent overall overheating and maintain food quality

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The susceptor's patterned structure creates periodic zones of high and low microwave absorption, generating alternating regions of intense and moderate heating that promote crust development while maintaining interior moisture and achieving balanced cooking

Inventive Principle:

Principle #19Periodic action

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

These structures improve the cooking of dough-based items by maintaining heat, promoting browning and crisping, and retaining moisture, resulting in better texture and flavor.

Implementation Method 1

a susceptor that converts at least a portion of impinging microwave energy into thermal energy

Methodology Applied

Scientific EffectMicrowave energy conversion to thermal energy: Dielectric Heating

Implementation Method 2

a plurality of closed cells that are capable of reducing heat transfer from the layer of microwave energy interactive material

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS8993947B2Microwave energy interactive insulating sheet and system

Publication Date: 2015.03.31 GRAPHIC PACKAGING INTERNATIONAL LLC

AI summary

A microwave energy interactive insulating structure comprises a layer of microwave energy interactive material supported on a first polymer film layer, a moisture-containing layer joined to the layer of microwave energy interactive material, a second polymer film layer joined to the moisture-containing layer in a predetermined pattern to define a plurality of closed cells between the moisture-containing layer and the second polymer film layer, and an aperture extending through the first polymer film layer, the moisture-containing layer, and the second polymer film layer.