Fusible Material Adhesion for Self-Heating Containers
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Solution Overview
Problem
Self-heating containers with chemical heaters face issues of inconsistent product temperatures due to ambient temperature variations, leading to potential scalding risks and inefficient heat management, as existing methods for moderating heat generation are not always effective in preventing premature release of fusible materials.
Innovation Solution
A method for adhering a shaped fusible material containing a reaction suppressant to the metallic wall of a self-heating container, where the fusible material is heated and then cooled to solidify in place, ensuring it adheres without premature release, and can be used to moderate the exothermic chemical reaction by dropping into the reaction chamber when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heater is sized to produce the desired product temperature starting from 0°C ambient, then the product temperature is sufficient in cold conditions, but the product temperature may be unacceptably high if the ambient temperature increases to 20°C
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of the fusible material through temperature-dependent melting and solidification. The fusible material transitions from solid to liquid state at specific temperature thresholds, automatically adjusting the heat transfer characteristics to maintain safe product temperatures across varying ambient conditions
Solution Approach 2:
The fusible material is positioned beforehand on the container wall to act as a thermal buffer. When the reaction chamber temperature rises excessively, the fusible material melts and moves into the reaction chamber, absorbing excess heat and preventing dangerous temperature excursions before they can affect the product
2Temperature
If water is included in the reaction mixture to moderate temperature, then extreme temperature excursions are moderated, but the rate of heat generation is reduced to an unacceptably low level
Solution Approach 1:
The patent extracts the temperature moderation function from the reaction mixture itself and places it in the fusible material positioned on the container wall. This allows the reaction to proceed at full power without dilution by water, while the fusible material provides passive temperature control by melting and absorbing excess heat only when necessary
3Reliability
If fusible material is pressed onto the container wall, then it can moderate heat generation, but it may not prevent premature release of the fusible material into the reaction chamber
Solution Approach 1:
The patent utilizes phase transitions of the fusible material to ensure proper timing of its release. The material remains solid and adheres to the container wall at normal operating temperatures, then transitions to liquid state at elevated temperatures, causing it to automatically move into the reaction chamber only when heat moderation is actually needed
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
This method provides consistent and controlled heat management, minimizing the risk of scalding and maintaining product safety by ensuring the fusible material adheres correctly and moderates the reaction effectively, even in varying ambient conditions.
Implementation Method 1
The fusible material is heated to at least partially melt the fusible material
Implementation Method 2
The at least partially melted fusible material is allowed to cool and solidify
Implementation Method 3
magnetically coupling an induction coil of an induction heater to the metallic wall and energizing the magnetically-coupled induction coil
Implementation Method 4
a user-initiated, exothermic chemical reaction
Data Source
AI summary
A metallic product compartment of a single-use, self-heating container has melted onto one or more of its surfaces and re-solidified a shaped fusible material containing a reaction suppressant. A method of manufacturing includes providing the product container, positioning the fusible material, as a solid, in contact with a metallic wall of the container, heating at least a portion of the metallic wall with an electromagnetic induction heater to at least partially melt a portion of the fusible material, and enabling the melted portion of the fusible material to cool and re-solidify, thereby adhering the fusible material to the metallic wall.