Heating Substrate Thermal Gradient for Uniform Tobacco Baking
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Solution Overview
Problem
Existing heating apparatuses for heat-not-burn cigarettes face challenges in optimizing the temperature field, leading to varying vaping tastes due to complex heating film patterns, limited substrate size, and inefficient energy utilization.
Innovation Solution
A heating apparatus with a substrate featuring a thermal conductivity gradient, combined with a heating element and electrical conductors, optimized to create a consistent temperature field, enhancing energy utilization and vaping taste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the heating film pattern is optimized to form an optimal temperature field, then the vaping taste is improved, but the design and preparation process becomes complex, increasing the difficulty in product research, development, and manufacturing
Solution Approach 1:
The substrate is designed with different thermal conductivities in different regions: the first region (where heating element is located) has lower thermal conductivity (1-5 W/(m·°C)) to concentrate heat, while the second region (where electrical conductors are located) has higher thermal conductivity (10-30 W/(m·°C)) to dissipate heat. This local differentiation automatically creates optimal temperature distribution without complex heating film patterns.
2Manufacturing precision
If the substrate size is increased to allow for better heating film pattern design, then the temperature field optimization is improved, but the device size increases
Solution Approach 1:
Instead of increasing substrate size, the patent changes the thermal conductivity parameter of the substrate material itself. By using a substrate with spatially varying thermal conductivity properties, the optimal temperature field is achieved within the same compact substrate dimensions, eliminating the need for larger substrate area.
3Area of stationary object
If the entire surface of the heating apparatus generates heat, then the heating coverage is improved, but the energy utilization rate decreases because electrical conductor positions do not participate in tobacco heating
Solution Approach 1:
The substrate is designed with spatially varying thermal conductivity: the first region (with heating element) has low thermal conductivity to concentrate heat for tobacco heating, while the second region (with electrical conductors) has high thermal conductivity to quickly dissipate heat away from conductor positions. This prevents energy loss at conductor locations while maintaining heating coverage.
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 achieves a higher energy utilization rate, better temperature field consistency, and improved vaping taste by simplifying the design and manufacturing process.
Implementation Method 1
a heating element combined on the substrate... the heating films having different patterns are electrified to generate a temperature field for baking tobacco
Implementation Method 2
the substrate includes a first region close to the root portion and a second region close to the end portion, the first region has a first thermal conductivity, the second region has a second thermal conductivity, and the first thermal conductivity is less than the second thermal conductivity
Implementation Method 3
The pyrolysis reaction of the tobacco materials at a low temperature emits lower concentrations of harmful components such as tar
Data Source
AI summary
A heating apparatus for an electronic baking cigarette device includes a substrate and a heating element on the substrate. The substrate includes a root portion configured for fixing and an end portion for inserting a cigarette. The substrate includes a first region close to the root portion and a second region close to the end portion, the first region has a first thermal conductivity, the second region has a second thermal conductivity, and the first thermal conductivity is less than the second thermal conductivity. The heating element is located in the first region. The substrate adopts a gradient thermal conductivity layout, so that the heating apparatus can have advantages such as a higher energy utilization rate, a better temperature field, a large amount of vapor during vaping, and a better vaping taste.