Bulk-Heating Graphite for Uniform Air Heating in Tobacco Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current heat-not-burn heating devices experience significant temperature differences in airflow heating due to the proximity to heating sources, leading to unsatisfactory heating effects on tobacco rods.
Innovation Solution
A method for preparing bulk-heating graphite with adjustable resistivity and resistance values, allowing uniform heat generation across the entire graphite body, achieved through specific processing steps including weighing, preheating, kneading, molding, and calcining graphite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If airflow heating with heating wire or heating needle is used, then the heating source can be easily implemented, but significant temperature differences occur in the heated air leading to unsatisfactory heating effects
Solution Approach 1:
The patent replaces the conventional heating wire/needle mechanical heating system with an electric field-based resistive heating system. The graphite material is impregnated with conductive slurry to create distributed heating zones, substituting direct contact mechanical heating with field-based energy distribution throughout the tobacco rod structure
Solution Approach 2:
The patent modifies the electrical resistance parameters of the graphite material by controlling the impregnation of conductive slurry. By adjusting the slurry composition, concentration, and impregnation conditions, the resistivity is optimized to achieve uniform heat generation throughout the graphite body, transforming the temperature distribution parameter from highly non-uniform to uniformly distributed
2Device complexity
If heating wire or heating needle is used as heating source, then the structure is simple, but the temperature distribution in heated air is non-uniform
Solution Approach 1:
The patent divides the heating function into multiple segmented zones by creating distributed conductive pathways within the graphite material. The conductive slurry forms discrete heating regions at different positions along the tobacco rod, allowing each segment to generate heat independently and collectively achieve uniform overall temperature distribution
Solution Approach 2:
The patent creates a composite structure by impregnating conductive materials (silver powder, conductive slurry) into the graphite matrix. This composite approach combines the thermal conductivity of graphite with the electrical conductivity of the impregnated materials, achieving both structural integrity and uniform resistive heating properties
3Device complexity
If conventional heating methods are used, then the heating component is simple, but the heating effect on tobacco rod is unsatisfactory
Solution Approach 1:
The graphite material serves dual functions: it provides structural support as the tobacco rod holder and simultaneously generates heat through its own resistive properties when electric current passes through it. This self-heating capability eliminates the need for separate heating elements while ensuring reliable and uniform heating of the tobacco rod
Solution Approach 2:
The graphite component performs multiple functions simultaneously: it acts as a structural support, a thermal conductor, and an active heating element. By integrating these functions into a single multi-functional component, the system achieves reliable heating effects without increasing overall 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
The bulk-heating graphite ensures uniform air temperature distribution and improved heating effects, providing consistent smoke flavor for tobacco rods by generating heat uniformly upon electrification.
Implementation Method 1
The bulk-heating graphite ensures uniform air temperature distribution and improved heating effects, providing consistent smoke flavor for tobacco rods by generating heat uniformly upon electrification
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Disclosed in the present invention are a method for preparing a bulk-heating graphite, a product, and an application thereof in a heating device. The method includes: weighing a powder material and a binder, wherein the powder material is pitch coke, and the binder is modified pitch; preheating the pitch coke; heating the modified pitch to a molten state; pouring the modified pitch into the preheated pitch coke and kneading to obtain a paste; subjecting the paste to hot rolling, cooling, crushing, and sieving to obtain a mixed powder; isostatically pressing molding the mixed powder to form a green body sample; and subjecting the molded green body sample to two calcining treatments to obtain a bulk-heating graphite sample. The method for preparing the bulk-heating graphite, the product, and the application thereof in the heating device provided in the present invention enable a honeycomb graphite as a whole to possess a heatable resistance, generating heat uniformly upon electrification, so as to produce sufficiently heated air with uniform temperature distribution and improved heating effects, thereby meeting the requirement of baking the tobacco rod for smoking, and resulting in excellent baking effects of the tobacco rod and consistent smoke flavor for every puff. There is no need to combine a porous honeycomb diffuser with other heating elements, making assembly more convenient.