Capillary Heating Assembly Particle Filter Aerosol System

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Solution Overview

Problem

Handheld aerosol-generating systems face issues with particles from the aerosol-forming substrate entering the airflow passage, potentially causing undesired products and reducing system efficiency, as these particles can accumulate and lead to thermal decomposition or be inhaled by the user.

Innovation Solution

The system incorporates a heating assembly with a capillary material and a mesh or filter configuration that inhibits particle transmission to the airflow passage, using a capillary material in fluidic communication with the heating element and a filter located between the reservoir and capillary material to prevent particle contact with the heating element and ensure only vapor is generated.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If capillary material is used to transport substrate to heating element, then substrate delivery is improved, but particle transmission to heating element increases

Engineering Contradiction:

Improvesubstrate deliveryVSAvoidparticle transmission

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

A filter is introduced as an intermediary component between the capillary material and the heating element. The filter has pore sizes smaller than the particles in the substrate, allowing it to intercept and block particles while permitting vapor and liquid substrate to pass through. This mediator resolves the contradiction by maintaining substrate delivery functionality while preventing harmful particle transmission to the heating element.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The filter utilizes porous material with controlled pore sizes that are smaller than the particles in the substrate but larger than vapor molecules. This selective porosity enables the filter to differentiate between particles and vapor, allowing vapor to pass through while blocking particles. The porous structure maintains substrate flow while preventing particle accumulation on the heating element.

Inventive Principle:

Principle #31Porous materials

2Reliability

If particles contact heating element, then thermal decomposition occurs, but system complexity increases with filtration

Engineering Contradiction:

Improvethermal decomposition preventionVSAvoidfiltration system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The filter is merged with the capillary material or integrated into the existing substrate delivery pathway, combining the filtration function with the existing substrate transport structure. This integration minimizes additional components and complexity while achieving particle prevention. The filter may be incorporated as a layer within the capillary material or as a simple screen at the interface with the heating element.

Inventive Principle:

Principle #5Merging (Combining)

3Object-affected harmful factors

If filter with small pores is used, then particle blocking is improved, but substrate flow resistance increases

Engineering Contradiction:

Improveparticle blockingVSAvoidsubstrate flow resistance

Core Design Contradiction:

Object-affected harmful factorsVSStress or pressure

Solution Approach 1:

The filter with small pores is positioned locally at the interface between the capillary material and the heating element, rather than throughout the entire substrate delivery path. This localized filtration approach allows substrate to flow freely through the capillary material while only requiring particle blocking at the critical interface with the heating element. The small pore size is applied only where particle blocking is most critical, minimizing overall flow resistance.

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

This configuration effectively prevents particles from entering the airflow passage, reducing the risk of thermal decomposition and ensuring a cleaner aerosol for inhalation, thereby enhancing user experience and system longevity by maintaining airflow and preventing particle accumulation.

Implementation Method 1

a capillary material, one side of the capillary material being in fluidic communication with the heating element, an opposite side of the capillary material being in fluidic communication with the reservoir so as transport the aerosol-generating substrate to the heating element by capillary action

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

the heating element is configured to heat the aerosol-generating substrate therein to generate a vapour

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS12193504B2Aerosol-generating system and a cartridge for an aerosol-generating system having particulate filter

Publication Date: 2025.01.14 PHILIP MORRIS PRODUCTS SA

AI summary

A vapour-generating system is provided that comprises a housing comprising an air inlet, an air outlet, and an airflow passage extending there between; a reservoir holding an aerosol-generating substrate. The heating assembly comprises a heating element and a capillary material. One side of the capillary material is in fluidic communication with the heating element, and an opposite side of the capillary material is in fluidic communication with the reservoir so as transport the aerosol-generating substrate to the heating element by capillary action. The heating element is configured to heat the aerosol-generating substrate therein to generate a vapour. The heating assembly is configured to inhibit transmission of particles in the aerosol-generating substrate into the airflow passage.