Self-Heating Container Using Exothermic Reaction for Portable Heating
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Solution Overview
Problem
Existing self-heating containers for beverages and depilatory waxes face issues such as short-lasting heat, uneven heating, contamination risks, and difficulty in heating without specialized equipment, particularly for outdoor or emergency situations, and they often require complex valve systems to prevent leaks.
Innovation Solution
The development of instant self-heating containers with a nested shell structure containing a target container and an activator container, where an exothermic reaction is triggered by piercing the activator container to combine with a reactant in a reaction chamber, providing a long-lasting and uniform heat source, and a disposable, inexpensive design suitable for depilatory wax dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external heating means (microwaves, stoves, electricity) are used to heat beverages and food, then the heating effect is reliable, but the portability and accessibility are limited especially in outdoor or emergency situations
Solution Approach 1:
The container performs heating functions autonomously through an exothermic reaction between water and quicklime. The user simply adds water to activate the heating mechanism, and the system self-heats the contents without requiring external power sources, microwaves, or stoves. This enables reliable heating in portable, outdoor, or emergency situations where conventional heating equipment is unavailable.
2Speed
If quicklime and water reaction is used for instant heating, then the heating speed is fast, but the heat duration is short and the contents cool down quickly
Solution Approach 1:
The container employs a nested structure with an inner quicklime chamber surrounded by an outer water reservoir. When activated, water flows onto the quicklime to initiate the exothermic reaction. The nested design ensures continuous contact between reactants, maintaining sustained heat generation. Additionally, the reaction chamber is thermally coupled to the contents chamber, efficiently transferring heat to the beverages or food for an extended duration.
3Ease of manufacture
If simple container structure is used, then the manufacturing cost is low and ease of manufacture is high, but the heating uniformity and temperature consistency are poor
Solution Approach 1:
The container is divided into functionally distinct segments: an inner quicklime chamber, an outer water reservoir, a reaction chamber, and a contents chamber. This segmentation allows each component to perform its specific function optimally while maintaining overall manufacturing simplicity. The separated design enables better thermal management and more uniform heat distribution to the contents compared to a single-chamber design.
4Reliability
If complex valve systems are added to prevent leaks, then the temperature control and leak prevention are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent eliminates the need for complex valve systems by extracting the leak prevention function into the fundamental container design. The quicklime chamber and water reservoir are sealed from the outset, and the exothermic reaction is contained within a closed system. Heat is transferred through thermal conduction and convection rather than requiring mechanical control valves, significantly simplifying the overall device while maintaining reliable leak prevention.
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 solution ensures a consistent elevated temperature for an extended period, reduces contamination risks, and allows for rapid and uniform heating of contents, including depilatory wax, while being cost-effective and easy to use without specialized equipment.
Implementation Method 1
an exothermic reaction is triggered by piercing the activator container to combine with a reactant in a reaction chamber, providing a long-lasting and uniform heat source
Data Source
AI summary
Instant self-heating containers include a combinable reactant and activator used to generate an exothermic reaction for heating contents of the container. One instant self-heating container includes a target container, a pierceable activator container and a reaction chamber. Piercing the activator container causes activator to combine with the reactant and cause an exothermic reaction that heats the target container. The container may be used as depilatory wax dispenser. Another instant self-heating container includes an outer housing containing a contents pouch and a reactant, and capped by a lid having an activator chamber. Rupturing the activator chamber allows activator to combine with the reactant in an exothermic reaction to heat the contents pouch. Another instant self-heating container includes a flexible outer tube containing contents to be heated, a flexible reaction vessel, and a frangible activator vessel. Bending the outer tube causes the activator vessel to rupture and cause an exothermic reaction.