Microwave Heating Sheet With Polyelectrolyte Solvent
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Solution Overview
Problem
Existing microwave heating packages are inadequate in achieving a crispy texture for heated food due to inefficiencies in moisture removal and temperature distribution, necessitating a novel heating mechanism for improved cooking efficiency.
Innovation Solution
A microwave heating sheet comprising a substrate with a heating layer made of a polar solvent with a boiling point above 100°C and a polyelectrolyte dissolved therein, which undergoes ionic polarization to generate thermal energy when exposed to microwave energy, optimizing temperature rise and cooking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If metalized microwave heating packages are used, then microwave energy absorption is improved, but manufacturing complexity and cost increase due to vacuum vapor deposition processes
Solution Approach 1:
The patent changes the material composition parameters from metal-based (aluminum) to non-metallic polar substances (graphite, salts, polar solvents) that can absorb microwave energy through ionic polarization and dipole rotation mechanisms, eliminating the need for vacuum vapor deposition while maintaining heating effectiveness
Solution Approach 2:
The patent employs inexpensive, readily available materials such as graphite powder, table salt, sugar, and common polar solvents (water, alcohol) that can be applied through simple coating processes, replacing expensive metal films and complex manufacturing procedures
2Ease of manufacture
If non-metalized microwave heating packages with graphite coatings are used, then manufacturing simplicity is improved, but heating efficiency and temperature distribution are insufficient
Solution Approach 1:
The patent creates composite heating formulations by combining multiple microwave-absorbing substances (graphite, salts, sugars) with polar solvents in specific ratios, enhancing the overall microwave absorption capacity and heating efficiency while maintaining simple coating application methods
Solution Approach 2:
The patent uses substances that serve multiple functions: polar solvents provide both microwave absorption through dipole rotation and heat transfer through conduction, while ionic compounds contribute to heating through ionic polarization, creating a multi-mechanism heating system
3Ease of operation
If conventional microwave heating is used, then cooking convenience is improved, but moisture removal capability is insufficient resulting in soft food texture
Solution Approach 1:
The patent utilizes phase transition of water from liquid to vapor through microwave-induced heating, enabling effective moisture removal from food surfaces. The microwave-absorbing coating reaches temperatures sufficient to evaporate water, transforming the food texture from soft to crispy
Solution Approach 2:
The patent leverages the periodic oscillation of microwave electromagnetic fields to continuously agitate polar molecules and ions, generating sustained heating effects that progressively remove moisture from the food through repeated heating cycles
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 microwave heating sheet effectively raises the temperature of the heating layer to above 85°C in 30 seconds, enhancing the crispy texture of heated food through controlled thermal energy distribution and viscosity management of the coating mixture.
Implementation Method 1
a polyelectrolyte that is dissolved in the polar solvent
Data Source
AI summary
A microwave heating sheet includes a substrate and a heating layer disposed on a first surface of the substrate. The heating layer includes a polar solvent that has a boiling point of not less than 100° C. and a polyelectrolyte that is dissolved in the polar solvent.