Toaster Intermittent Heating Control to Reduce Outer Surface Burning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional toasters fail to achieve optimal heating of both the outer surfaces and innermost layers of toast, with short programs browning the outside but underheating the inside, while longer programs risk burning the outer surfaces.
Innovation Solution
A toaster with a control unit executing a main heating program comprising a series of activations and deactivations of the heating element, allowing heat to penetrate deeper into the food without burning the outer surfaces, along with a user interface to select between continuous and intermittent heating programs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heating program duration is extended to heat the innermost layers of toast, then the inside heating is improved, but the outer surfaces get too hot or burn
Solution Approach 1:
The heating element operates in periodic cycles with multiple activation phases separated by deactivation phases. During activation phases, the heating element heats the toast; during deactivation phases, heat penetrates to innermost layers without additional external heat input. This periodic action allows controlled heat penetration to the center while preventing excessive outer surface temperature and burning.
2Object-affected harmful factors
If the heating program duration is shortened to prevent outer surface burning, then the outer surface browning is satisfactory, but the inside is underheated
Solution Approach 1:
The heating program uses periodic activation and deactivation phases. During brief activation phases, the outer surfaces are quickly browned; during subsequent deactivation phases, heat continues to penetrate to the innermost layers without additional external heat input. This allows adequate inner heating while limiting total external heat exposure time to prevent outer surface burning.
3Temperature
If continuous heating is applied to heat the food thoroughly, then the inside heating is improved, but the outer surfaces get excessively dry or burned
Solution Approach 1:
The heating element operates periodically with activation phases for heating and deactivation phases for heat penetration. During deactivation phases, no additional heat is applied to the outer surfaces, allowing them to cool slightly and preventing excessive dryness and burning, while heat continues to penetrate to the food interior during these intervals.
4Adaptability or versatility
If multiple heating programs are provided for different food types, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The control unit implements a standardized periodic heating pattern with activation and deactivation phases that can be applied across multiple heating programs. This modular periodic approach allows the same fundamental heating mechanism to serve multiple food types and cooking requirements, achieving versatility without proportionally increasing device complexity.
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 solution ensures even heating of both the outer surfaces and innermost layers of food, improving the quality of toasted products and preventing burning, while maintaining a simple and economical manufacturing structure.
Implementation Method 1
Heating elements are also associated with the heating compartments, typically consisting of electric resistors that, when run by electric current, transfer heat to the foods inserted in the heating compartments
Implementation Method 2
Heating elements are also associated with the heating compartments, typically consisting of electric resistors that, when run by electric current, transfer heat to the foods inserted in the heating compartments
Data Source
Figure 1
AI summary
A toaster comprising: at least one heating compartment (11, 12), in which the food to be heated (13, 14) is positioned; at least one heating element (21-24), associated with said at least one heating compartment (11, 12) and adapted to heat the food (13, 14) positioned in said at least one heating compartment (11, 12); a control unit (30), acting upon said at least one heating element (21-24) and configured for executing a main heating program comprising a succession of activations, separated by respective deactivations, of said at least one heating element (21-24).