Induction Heating Element Geometry to Prevent Smokable Material Combustion

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Solution Overview

Problem

Existing smoking articles that burn tobacco to create smoke do not effectively provide alternatives that release compounds without combustion, and existing heat-not-burn products face challenges in efficiently heating smokable materials without causing combustion.

Innovation Solution

The use of induction and magnetic hysteresis heating methods, employing a heating element with a geometric constriction to enhance magnetic field concentration and control heating profiles, ensures that smokable materials are heated to prevent combustion and volatilization without causing materials to vaporize at least one component of the smokable material without burning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional heating methods are used to heat smokable material, then heating efficiency is improved, but combustion of the material occurs

Engineering Contradiction:

Improveheating efficiencyVSAvoidcombustion

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The heating element incorporates sections with different thicknesses (first section with thickness T1, second section with thickness T2, third section with thickness T3 where T3 < T1 and T3 < T2), creating local variations in magnetic field concentration. This allows different regions of the heating element to heat different portions of the smokable material at different rates, achieving efficient heating while preventing combustion by avoiding uniform overheating

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes induction heating with varying magnetic field penetration depths by changing the excitation frequency and adjusting the heating element geometry. By controlling the skin depth and magnetic field distribution parameters, the system achieves efficient heating of the smokable material while maintaining temperatures below combustion points

Inventive Principle:

Principle #35Parameter changes

2Productivity

If heating temperature is increased to improve volatilization efficiency, then compound release is improved, but combustion occurs

Engineering Contradiction:

Improvevolatilization efficiencyVSAvoidcombustion temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

Different thickness sections of the heating element create localized heating zones with different temperature profiles. The thinner third section provides concentrated heating for efficient volatilization, while the thicker first and second sections act as heat sinks that prevent temperature from rising to combustion levels

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The induction heating system operates with periodic alternating magnetic fields at controlled frequencies. This periodic action allows for pulsed heating cycles that achieve efficient volatilization during active heating phases while allowing cooling during off phases, preventing sustained temperatures that would cause combustion

Inventive Principle:

Principle #19Periodic action

3Ease of operation

If uniform heating is applied to smokable material, then heating simplicity is maintained, but hot spots cause combustion

Engineering Contradiction:

Improveheating controlVSAvoidhot spots

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The heating element is designed with non-uniform thickness distribution (first section T1, second section T2, third section T3 with T3 being the thinnest), creating intentional hot and cold zones. This geometric variation naturally distributes heat across different regions of the smokable material, preventing localized hot spots while maintaining relatively simple operation through automatic self-regulation of heat distribution

Inventive Principle:

Principle #3Local quality

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 heating element effectively volatilizes components of smokable materials without combustion, providing a controlled heating process that prevents overheating and damage to the apparatus, ensuring safe and efficient operation.

Implementation Method 1

The heating element is heated by penetration with a varying magnetic field

Methodology Applied

Scientific EffectInduction heating: Induction Heating

Implementation Method 2

heating material that is heatable by penetration with a varying magnetic field

Methodology Applied

Scientific EffectMagnetic hysteresis: Magnetic Hysteresis

Implementation Method 3

smokable material in thermal contact with the heating element

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 4

The heating element has a Curie point temperature that is less than the combustion temperature of the smokable material

Methodology Applied

Scientific EffectCurie point temperature: Curie Point (ferromagnetic)

Data Source

PatentEP4007449B1Apparatus for heating smokable material

Publication Date: 2025.12.17 NICOVENTURES TRADING LTD

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AI summary

Disclosed is apparatus (400) for heating smokable material to volatilise at least one component of the smokable material. The apparatus includes a heating zone for receiving an article (4) comprising smokable material, a heating element (130) made of heating material that is heatable by penetration with a varying magnetic field to heat the heating zone, and a magnetic field generator for generating one or more varying magnetic fields that penetrate the heating element in use in such a way that a strength of the magnetic field, or a strength of a sum of the magnetic fields, differs at respective different locations in the heating element.