Combustible Heat Source Barrier Manufacturing via Hollow Die Molding
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Solution Overview
Problem
Existing heated smoking articles face challenges in preventing the migration of aerosol-formers and volatile components from the aerosol-forming substrate to the combustible heat source, leading to decomposition and thermal degradation, and in inhibiting combustion products from entering the inhalable aerosol during use.
Innovation Solution
A method of manufacturing a combustible heat source with a barrier affixed to its end face, using a hollow die and laminar barrier material to prevent direct contact between particulate components and punches, thereby reducing adherence and deposition, and employing a heat-conducting element around the aerosol-forming substrate to control temperature and airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier is provided between the combustible heat source and aerosol-forming substrate, then migration of aerosol-former and volatile components is prevented, but device complexity increases
Solution Approach 1:
The barrier is integrated into the die structure itself, forming an integral part of the manufacturing tool rather than being a separate component. The die includes a barrier-forming section that creates the barrier during the molding process, merging the barrier function with the existing die structure and eliminating the need for separate barrier installation steps.
Solution Approach 2:
The die serves multiple functions: it molds the combustible heat source, forms the barrier, and prevents migration of aerosol-former. By incorporating the barrier-forming capability into the die, the same tooling structure achieves both manufacturing and protective functions, reducing overall system complexity.
2Object-affected harmful factors
If a barrier is affixed to the combustible heat source, then combustion products are prevented from entering the aerosol, but manufacturing complexity increases
Solution Approach 1:
The barrier is formed during the molding process itself, before the combustible heat source is assembled with the aerosol-forming substrate. The die creates the barrier as part of the heat source structure, performing the protective function setup in advance rather than as a separate post-assembly step.
Solution Approach 2:
The barrier formation is merged with the molding process. The die structure includes features that simultaneously mold the combustible material and create the barrier, combining two manufacturing operations into one integrated process step.
3Manufacturing precision
If laminar barrier material is used to cover the die opening, then barrier formation is improved, but material waste increases
Solution Approach 1:
A thin laminar barrier material is used to line the die opening, conforming to the die geometry and forming the barrier through the molding process. This thin film approach provides effective barrier formation while minimizing material consumption compared to thicker or more substantial barrier structures.
Solution Approach 2:
The laminar barrier material is designed to be consumed in the process, forming the barrier that remains with the product. The material is discarded in the sense that it is used up during molding, but it becomes an integral protective feature of the final product rather than separate waste.
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 method effectively prevents the migration of aerosol-formers and volatile components, reduces thermal degradation, and inhibits combustion products from entering the inhalable aerosol, improving the quality and performance of combustible heat sources in smoking articles.
Implementation Method 1
The barrier is physically separate from the heat source and is held in place by frictional fit or by adhesive
Implementation Method 2
compressing the one or more particulate components to form a combustible heat source
Implementation Method 3
a heat-conducting element around and in direct contact with a rear portion of the combustible heat source and an adjacent front portion of the aerosol-forming substrate
Implementation Method 4
the barrier may limit the temperature to which the aerosol-forming substrate is exposed during ignition or combustion of the combustible heat source
Implementation Method 5
The barrier may prevent or inhibit migration of the aerosol-former from the aerosol-forming substrate to the combustible heat source
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(b)
AI summary
There is provided a method of manufacturing a combustible heat source (100) having a barrier (110) affixed to an end face (112) thereof. The method comprises providing a hollow die (130) having a first opening and an opposed second opening; covering the first opening of the hollow die (130) with a laminar barrier material (160); punching a barrier (110) from the laminar barrier material (160) by inserting a first punch (140) into the hollow die (130) through the first opening; placing one or more particulate components(120) in the hollow die (130)through the second opening; compressing the one or more particulate components (120) to form a combustible heat source (100) and affix the barrier (110) to an end face (112) of the combustible heat source (100) by inserting a second punch (150) into the hollow die (130) through the second opening; and ejecting the combustible heat source (100) having the barrier (110) affixed to the end face (112) thereof from the hollow die (130).