Package for storing and cooking food with temperature-activated ventilation
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Solution Overview
Problem
Existing food packaging solutions that vent pressure during cooking often require user intervention or rely on moisture and heat, which can lead to incomplete venting or package explosion risks if not adequately addressed.
Innovation Solution
A food storage and cooking package with a temperature-actuated venting mechanism, using thermoplastic adhesives or microwave susceptor materials to automatically open ventilation holes without requiring pressurization, ensuring safe and efficient cooking without user manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If pressure-driven venting features are used, then automatic venting is achieved, but the package requires sufficient free moisture and high cooking temperature to activate the venting
Solution Approach 1:
The patent replaces the pressure-driven mechanical venting system with a temperature-driven system. The adhesive layer's glass transition temperature causes it to soften and allow venting at a specific temperature, eliminating the need for pressure buildup that would otherwise be required to force open pressure-sensitive venting features.
Solution Approach 2:
The patent changes the activation parameter from pressure to temperature. By selecting an adhesive with a specific glass transition temperature, the venting is triggered by temperature increase during cooking rather than by pressure buildup, allowing venting to occur at lower moisture content conditions.
2Extent of automation
If pressure-driven venting features are used, then automatic venting is achieved, but the food may reach desired cooking state before sufficient heat and pressure develop
Solution Approach 1:
The patent changes the activation parameter from pressure to temperature, which develops more predictably and earlier during the cooking process. Temperature increases steadily from the start of cooking, whereas pressure buildup requires sufficient moisture generation and heating, which may occur later in the cooking cycle.
Solution Approach 2:
The patent incorporates a visual indication feature that provides feedback to the user about cooking status. This complementary feature helps users monitor the cooking process and understand when the venting has occurred, improving overall cooking timing control.
3Reliability
If pressure-driven venting features are used, then venting capability is provided, but no visible indication of cooking completion is given
Solution Approach 1:
The patent incorporates a visual indication feature that changes color or provides visible feedback when cooking is complete. This complements the venting mechanism by providing users with clear information about cooking status, addressing the information loss problem.
4Extent of automation
If adhesive labels covering ventilation holes are used, then automatic temperature-driven venting is achieved, but the adhesive must be deactivated in the vent hole region to allow steam escape
Solution Approach 1:
The patent applies adhesive only to specific regions of the label - the periphery areas - while leaving the central vent hole region free of adhesive or with deactivated adhesive. This local differentiation allows the label to seal the package edges while permitting steam escape through the vent hole when the adhesive softens at the glass transition temperature.
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 package provides a safe and efficient cooking solution by automatically venting through temperature-actuated mechanisms, eliminating the need for user intervention and ensuring consistent cooking results without high moisture content, while offering a visual indication of cooking status.
Implementation Method 1
a thermoplastic adhesive having a glass transition temperature that causes the sealing patch to become unsealed when the container is heated to a specified venting temperature
Implementation Method 2
a microwave susceptor material in thermal communication with the adhesive and configured to directly warm the adhesive when the package is exposed to microwave heating
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A package suitable for storing and cooking foods without user manipulation includes a venting mechanism actuated primarily or exclusively by temperature, rather than pressure. A vent hole can be sealed by a patch attached by a thermoplastic adhesive having a selected, well characterized Tg, or the patch itself can be a thermoplastic polymer having a selected Tg. The patch can be convection-heated, or a microwave absorbing susceptor material can be applied to the adhesive or patch for direct microwave heating. The patch can include a region that is melted by convection or by a susceptor material. A porous patch can be sealed by a low melting temperature polymer or by thermally sensitive ink. And/or, microwave susceptor material can be applied directly to a package wall and can melt a ventilation hole through the wall when a specified amount of microwave energy has been applied.