Self-Heating Container Structure for Uniform, Longer-Lasting Heat
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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, risk of contamination, and difficulty in heating without specialized equipment, particularly in outdoor or emergency situations.
Innovation Solution
The development of instant self-heating containers with a nested shell structure containing a target container for contents and an activator container, where an exothermic reaction is triggered by a piercer to heat the contents uniformly and maintain temperature for an extended period, and a disposable depilatory wax dispenser with a controlled exothermic reaction for safe and efficient wax application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating means (microwaves, stoves, electricity) are used to heat beverages and food, then the contents can be heated to desired temperature, but access to such equipment is not available in outdoor or emergency situations
Solution Approach 1:
The container performs heating function autonomously through an exothermic reaction between water and quick lime contained within the container itself, eliminating the need for external heating equipment. The system self-generates heat by mixing the reactants, making it portable and suitable for outdoor or emergency use.
2Speed
If quick lime and water reaction is used to heat contents, then instant heating is achieved, but the reaction completes very quickly causing contents to cool down rapidly
Solution Approach 1:
The system transitions from a static, instantaneous reaction to a dynamic, controllable process. The reactants are kept separate until activation, at which point the reaction proceeds at a controlled rate that maintains heat for an extended period, allowing contents to remain hot for consumption over time rather than cooling rapidly.
3Speed
If quick lime exothermic reaction is used to achieve instant heating, then heating speed is improved, but the reaction is extremely hot creating safety concerns
Solution Approach 1:
The system modifies the reaction parameters by controlling the mixing rate and ratio of water to quick lime. This regulates the exothermic reaction to produce sufficient heat for instant heating while preventing dangerous temperature spikes, making the process safe for consumer use.
4Reliability
If a complicated one-way valve is provided to prevent slurry leakage, then containment is improved, but device complexity increases
Solution Approach 1:
The complex one-way valve mechanism is removed entirely. Instead, the system uses a simple frangible barrier (foil or membrane) that breaks under the pressure and force of the reaction, allowing controlled release of gases while containing the slurry. This passive mechanism is far simpler than an active valve system.
5Temperature
If bulk wax is heated by electrical means in a container, then the wax can be maintained at correct temperature, but it requires specialized heating equipment and risks dangerous overheating
Solution Approach 1:
The wax heating container uses an exothermic reaction between water and quick lime contained within the same container to self-generate heat. This eliminates the need for external electrical heating equipment, making the system simpler and safer by removing the risk of electrical overheating while maintaining proper wax temperature.
6Productivity
If multiple dips into the heated wax container are needed for wax application, then complete coverage is achieved, but cross contamination occurs between uses
Solution Approach 1:
The system uses a disposable applicator that is discarded after a single use. Each new application uses a fresh applicator dipped into the wax container, ensuring that no cross-contamination occurs between uses. The applicator is inexpensive and single-use, making this approach practical and hygienic.
7Productivity
If the applicator is reloaded by scooping additional wax from the bulk container, then the applicator can be reused, but the bulk wax becomes contaminated
Solution Approach 1:
Instead of reloading and reusing the applicator, the system employs a disposable applicator that is discarded after one use. This eliminates the contamination problem entirely, as each applicator contacts the bulk wax only once and is then thrown away, preventing any back-contamination of the wax supply.
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 provides a long-lasting, uniform heating solution for beverages and depilatory waxes, reducing contamination risks and enabling efficient use without specialized equipment, while being cost-effective and disposable.
Implementation Method 1
an exothermic reaction is triggered by a piercer to heat the contents uniformly
Implementation Method 2
a nested shell structure containing a target container for contents and an activator container
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.