Microwave Pouch Score Layer for Predictable Pressure Venting

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Solution Overview

Problem

Existing cooking methods for certain food types, such as vegetables and fish, result in vitamin and color loss, structural changes, and safety hazards due to direct water exposure or high heat retention in packaging, while existing microwave solutions are costly and inefficient for steaming frozen foods.

Innovation Solution

A flexible microwave pouch with a base and cover, featuring a sealant and score layer, that retains hot gases above atmospheric pressure to cook food and vents predictably when pressure exceeds a predetermined level, allowing for safe and efficient steaming of frozen foods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a closed pouch is used to prevent water contact during cooking, then food quality is improved, but the pouch becomes difficult to handle after cooking due to heat retention

Engineering Contradiction:

Improvefood qualityVSAvoidhandling ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The pouch is divided into two functional parts: a sealed base portion that maintains food quality by preventing water contact, and an open top portion that allows easy access and cooling after cooking. This segmentation resolves the contradiction by allowing the pouch to maintain its protective function while being easily handleable.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pouch is designed with an open top configuration before cooking, allowing steam to escape during the cooking process. This preliminary design feature prevents excessive heat retention that would make handling difficult, while still maintaining food quality through the sealed base portion.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If a rigid container with pressure relief valve is used for microwave cooking, then pressure control is improved, but manufacturing cost increases and shelf life decreases

Engineering Contradiction:

Improvepressure controlVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention uses a flexible pouch made of microwave-transparent material instead of a rigid container. The flexible nature of the pouch allows it to expand and contract with pressure changes during microwave cooking, providing pressure control without requiring expensive rigid structures with complex pressure relief mechanisms.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The pouch is designed as a disposable, single-use container that is inexpensive to manufacture. The low cost of the flexible pouch material and simple construction allows for economical production while maintaining adequate shelf life for frozen food storage.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-generated harmful factors

If adhesive strips are removed to vent steam during microwave cooking, then steam venting is improved, but the pouch structure becomes compromised

Engineering Contradiction:

Improvesteam ventingVSAvoidpouch structure

Core Design Contradiction:

Object-generated harmful factorsVSStrength

Solution Approach 1:

The pouch is pre-designed with an open top configuration that provides a built-in venting path for steam during microwave cooking. This preliminary structural feature eliminates the need to remove adhesive strips or compromise the pouch structure, as the open top naturally allows steam to escape while maintaining the integrity of the sealed base portion.

Inventive Principle:

Principle #10Preliminary 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

Enables low-cost, low-waste steaming of frozen foods with predictable venting and easy handling, preventing vitamin loss and heat-related injuries, while maintaining food quality and safety.

Implementation Method 1

a base configured to retain hot gasses above atmospheric pressure within the pouch to heat and cook the food item

Methodology Applied

Scientific EffectPressure retention: Pressure Increase

Implementation Method 2

when the package is exposed to microwave energy

Methodology Applied

Scientific EffectMicrowave heating: Dielectric Heating

Implementation Method 3

The score layer includes a weak portion which ruptures and vents the pouch at a predictable location when pressure within the pouch due to the hot gasses exceeds a predetermined pressure

Methodology Applied

Scientific EffectPressure-driven rupture: Pressure Increase

Data Source

PatentUS7781036B2Pouch for steaming vegetables

Publication Date: 2010.08.24 B&G FOODS NORTH AMERICA INIC

AI summary

A flexible pouch for cooking a food item using microwave energy. The pouch includes a base configured to retain hot gases above atmospheric pressure within the pouch to heat and cook the food item when the package is exposed to microwave energy. The pouch also includes a cover comprising a sealant layer and a score layer. The score layer includes a weak portion which ruptures and vents the pouch at a predictable location when pressure within the pouch due to the hot gasses exceeds a predetermined pressure.