Self-Heating Container Barrier Design for Rapid Beverage Heating
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Solution Overview
Problem
Existing self-heating systems for beverages and food are inefficient in heating larger volumes quickly and maintaining temperature, with poor design for reactant separation and mixing, leading to slow heating and temperature loss.
Innovation Solution
A compact, disposable self-heating container with a dual-compartment design that uses a breakable barrier to separate and mix chemical reactants, facilitating rapid and uniform heating of up to 6 fluid ounces of a consumable substance to 145°F within one minute, with a heat transfer coefficient of 0.0167 to 0.0833 BTU/(ft²·sec·°F), and maintaining temperature for an extended period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional self-heating systems use simple breakable partitions for reactant separation, then the device complexity is reduced, but the heating speed and temperature maintenance capability deteriorate
Solution Approach 1:
The container is divided into multiple compartments (first compartment for solid reactant, second compartment for liquid reactant, and third compartment for comestible substance) separated by barrier members. This segmentation allows controlled mixing of reactants to generate heat rapidly while maintaining device simplicity through the use of breakable barrier members that can be easily fractured to initiate the exothermic reaction.
Solution Approach 2:
The barrier members are designed with specific mechanical properties (fracture strength, flexibility) that allow them to be broken by applying predetermined force. This parameter change from intact to broken state controls the timing of reactant mixing, enabling rapid heat generation when needed while maintaining separation during storage and transport.
2Ease of operation
If traditional self-heating systems use simple breakable partitions, then ease of operation is improved, but temperature maintenance capability deteriorates
Solution Approach 1:
The barrier members are pre-positioned to separate reactants during storage, and the system is designed so that breaking the barrier (simple operation) initiates the exothermic reaction. The reaction naturally progresses through controlled stages, with the insulating layer and compartment design ensuring temperature maintenance for extended periods without requiring additional user actions.
Solution Approach 2:
The exothermic reaction continues progressively after barrier breakage, providing continuous heat generation. The insulating layer surrounding the reaction chamber maintains this heat for extended periods, ensuring continuous useful action (temperature maintenance) without interruption or additional user intervention.
3Speed
If the container uses a dual-compartment design with breakable barrier, then heating speed is improved, but device complexity increases
Solution Approach 1:
The barrier members are integrated within the container structure, with the first barrier member forming part of the seal between compartments. The movable barrier member can be positioned in multiple locations within the container, nesting the separation function within the existing container geometry rather than adding external components.
Solution Approach 2:
The barrier members serve multiple functions: they separate reactants during storage, act as seals between compartments, and can be broken to initiate the reaction. The movable barrier member can be positioned at different locations depending on the desired mixing pattern, providing versatility in controlling the reaction while maintaining a relatively simple container structure.
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 system efficiently heats beverages or food to 145°F in under a minute and maintains the temperature for at least 2 minutes, providing a compact and reliable solution for on-the-go heating without the need for conventional heating sources.
Implementation Method 1
Self-heating technology based on an exothermic reaction between different reagents is often used in such containers. Typically, two or more reagents are initially separated by a breakable partition in the container, and when heat needs to be generated, the partition is broken to allow the mixing of the reagents, thereby creating an exothermic reaction for heat generation.
Implementation Method 2
The barrier preferably comprises a stationary member and a movable member, wherein the stationary member is substantially fixed relative to the outer body. The movable member is removably attached to the stationary member and adapted to seal the opening. When a predetermined threshold force is applied to a preselected area on the container, the movable barrier member separates from the stationary barrier member, resulting in the entire fixed sized opening being uncovered, thus allowing one or more chemical reactants to flow from one chamber to the other
Implementation Method 3
the pressure from the out-flowing chemical reactants pushes the movable barrier member away from the opening to substantially inhibit the movable barrier member from blocking portions of the opening
Implementation Method 4
the coefficient of heat transfer from the reaction mixture to the comestible substance is about 0.0167 to about 0.0833 BTU/(ft2·sec.·° F.)
Data Source
AI summary
Self-heating containers comprise a reaction chamber and a heating chamber. The heating chamber is sized to contain a substance to be heated. The reaction chamber contains reactants which, when contacted, exothermically react. The reaction chamber is divided into a first compartment and a second compartment with a barrier therebetween. The barrier comprises a first barrier portion and a second barrier portion. The first barrier portion is attached to a reaction chamber wall and has an opening sized to allow reactants to flow through from one compartment to the other. The second barrier portion is attached to the first barrier portion to close the opening. The barrier can be opened by moving an actuator into engagement with the second barrier portion to dislodge the second barrier portion from the first barrier portion and thereby open the barrier. In certain embodiments, the heating chamber can be a can with prepackaged comestible substance therein. Examples of components configured to facilitate such a can are disclosed.