Intumescent Coating on Exposed Heat Source for Aerosol Devices

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Solution Overview

Problem

Aerosol-generating articles with combustible heat sources pose a risk of heat damage to adjacent materials due to high temperatures, which can occur even after use, leading to potential damage during improper handling.

Innovation Solution

A multi-segment component design featuring a combustible heat source with an intumescent coating on its front portion, forming a heat insulating layer to reduce heat transfer and prevent damage, combined with a wrapper circumscribing the rear portion of the heat source and aerosol-forming substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the combustible heat source is exposed to generate aerosol, then aerosol generation efficiency is improved, but heat damage to adjacent materials increases

Engineering Contradiction:

Improveaerosol generation efficiencyVSAvoidheat damage to adjacent materials

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different properties to different parts of the heat source system: the front portion (exposed) maintains high temperature for aerosol generation, while the rear portion (wrapped) is insulated to prevent heat damage. This local differentiation resolves the contradiction between productivity and harmful effects.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The heat source system is divided into two segments: an exposed front portion for aerosol generation and a wrapped rear portion for heat containment. The wrapper circumscribing the rear portion creates spatial segmentation that isolates the harmful thermal effects from adjacent materials.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the combustible heat source reaches high temperature, then aerosol generation effectiveness is improved, but risk of heat damage after use increases

Engineering Contradiction:

Improveaerosol generation effectivenessVSAvoidheat damage risk after use

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The wrapper is applied to the rear portion of the heat source before use, providing预先 protection against heat damage. This pre-cushioning measure ensures that even when the heat source reaches high temperatures or remains hot after use, the wrapper prevents heat transfer to adjacent materials.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The wrapper acts as an intermediary barrier between the high-temperature heat source and adjacent materials. It mediates the thermal interaction, allowing the heat source to reach necessary temperatures for effective aerosol generation while preventing harmful heat transfer to surrounding components.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If the front portion of the combustible heat source is exposed, then heat transfer to aerosol-forming substrate is improved, but surface temperature causing damage increases

Engineering Contradiction:

Improveheat transfer to aerosol-forming substrateVSAvoidsurface temperature causing damage

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent implements local quality by exposing only the front portion of the heat source where heat transfer to the aerosol-forming substrate is needed, while wrapping the rear portion to control surface temperature and prevent damage. This selective exposure optimizes energy use while minimizing harmful effects.

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 intumescent coating effectively reduces the surface temperature of the aerosol-generating article, minimizing the risk of heat damage and creating a thermal barrier, thereby protecting adjacent materials from heat-related issues.

Implementation Method 1

an intumescent coating on all or part of the front portion of the combustible heat source, the intumescent coating being configured to form a heat insulating layer on the front portion of the combustible heat source in response to heating by the combustible heat source

Methodology Applied

Scientific EffectIntumescent coating expansion: Intumescent Materials

Implementation Method 2

The combustible heat source and the aerosol-forming substrate are in abutting coaxial alignment and, along with the heat-conducting element, are overwrapped in an outer wrapper of cigarette paper of low air permeability to hold the various components of the smoking article together. In use, the front portion of the aerosol-forming substrate is heated primarily by conduction through the abutting rear portion of the combustible heat source

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12178235B2Multi-segment component with intumescent coating

Publication Date: 2024.12.31 PHILIP MORRIS PRODUCTS SA

AI summary

A multi-segment component for an aerosol-generating article is provided, the multi-segment component including: a combustible heat source; an aerosol-forming substrate downstream of the combustible heat source; and a wrapper circumscribing a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate, a front portion of the combustible heat source extending beyond the wrapper so that the front portion of the combustible heat source is exposed during use; and an intumescent coating on all or part of the front portion of the combustible heat source, the intumescent coating being configured to form a heat insulating layer on the front portion of the combustible heat source in response to heating by the combustible heat source.