Coated Heating Chamber Assembly to Eliminate Aerosol Heater Air Gaps

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Solution Overview

Problem

Existing heating assemblies for aerosol generating devices suffer from inefficiencies in heat transfer, thermal losses due to air gaps, and require manual production processes, limiting their performance and manufacturing ease.

Innovation Solution

A heating assembly with a coating of electrically insulating material directly bonded to the heating chamber, overlaid by a coating of electrically conductive material, which acts as a Joule heater, eliminating air gaps and enabling automated production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a heating element is disposed on a dielectric backing film and attached to a heating chamber using polymer wrapping, then the heating assembly can be manufactured, but significant thermal losses occur due to air gaps between layers

Engineering Contradiction:

Improvethermal lossesVSAvoidmanufacturing process complexity

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent merges the heating element and dielectric backing into a single integrated coating structure applied directly to the heating chamber. This eliminates the need for separate polymer wrapping and removes air gaps between layers, thereby eliminating thermal losses while simplifying the manufacturing process to a single coating application step.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the mechanical polymer wrapping system with a coating-based attachment mechanism. The dielectric and heating layers are applied as coatings that bond directly to the heating chamber surface, eliminating the need for mechanical wrapping and associated air gaps that cause thermal losses.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Extent of automation

If polymer wrapping is used to attach the heating element, then the heating assembly can be secured, but manual production processes are required

Engineering Contradiction:

Improveproduction process automationVSAvoidmanufacturing simplicity

Core Design Contradiction:

Extent of automationVSEase of manufacture

Solution Approach 1:

The patent replaces manual mechanical wrapping processes with an automated coating application system. The heating element and dielectric layers are applied as coatings that can be deposited using automated techniques, eliminating the need for manual handling and wrapping operations while maintaining secure attachment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If a pre-formed heating element is used, then the heating assembly can be constructed, but the heating layer does not conform closely to the surface resulting in suboptimal heat transfer

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidheating layer configuration

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent employs a coating-based heating element that dynamically conforms to the heating chamber surface geometry. The coating material flows and adapts to the underlying surface morphology during application, ensuring close contact and optimal heat transfer across irregular surfaces, unlike rigid pre-formed elements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the physical state and application method of the heating element from a rigid pre-formed structure to a coating material that can be deposited in various forms (liquid, vapor, or gaseous). This allows the heating layer to adapt its shape and thickness to match the heating chamber surface, optimizing heat transfer efficiency.

Inventive Principle:

Principle #35Parameter changes

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

Improves energy efficiency, reduces heat-up and cool-down times, and allows for flexible heating patterns while ensuring reliable operation and ease of manufacturing.

Implementation Method 1

the coating of electrically conductive material is configured to act as a Joule heater when supplied with electrical current

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

the coating of electrically insulating material prevents any contact between the coating of electrically conductive material and the heating chamber

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 3

there are no air gaps or other thermal breaks between the layers which would otherwise result in thermal losses

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP4287879B1Heating assembly for an aerosol generating device

Publication Date: 2025.12.10 JT INTERNATIONAL SA

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AI summary

A heating assembly (200) for an aerosol generating device (100) is disclosed. The heating assembly (200) comprises a heating chamber (202) having an opening (204) for receiving an aerosol substrate. A coating of electrically insulating material (206) is formed on a surface of the heating chamber (202). A coating of electrically conductive material (208) at least partially coats the coating of electrically insulating material (206). The coating of electrically conductive material (208) is configured to act as a Joule heater when supplied with electrical current. The coating of electrically insulating material (206) prevents any contact between the coating of electrically conductive material (208) and the heating chamber (202).