Blade-Shaped Heater Anchoring via Through-Hole Molded Mount
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Solution Overview
Problem
Existing aerosol-generating devices face challenges with the loosening of the heater within the heater mount due to repeated adhesion of the aerosol-forming substrate, leading to weakened anchoring and potential breakdown of the interface, which is exacerbated by the use of powders in clean-room environments.
Innovation Solution
The introduction of a through-hole in the heater substrate allows the mouldable material of the heater mount to flow through and form a mechanical tie, enhancing anchoring and preventing excessive movement, while the heater's design with a tapered end and lugs or notches further secures the heater's position, using a polymeric material like PEEK for the mount and ceramic materials like zirconia for the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the heater is inserted into the aerosol-forming substrate for direct heating, then heating efficiency is improved, but the heater becomes loose after repeated use due to adhesion between the heater and substrate
Solution Approach 1:
The heater is divided into two distinct portions: a heating portion with higher resistivity that contacts the aerosol-forming substrate for efficient heating, and a holding portion with lower resistivity that interfaces with the heater mount for stable anchoring. This segmentation allows the heating function and mounting function to be separated, so that adhesion during heating does not compromise mounting stability.
Solution Approach 2:
Different portions of the heater are assigned different electrical resistivity properties. The heating portion has higher resistivity to generate heat efficiently when contacting the substrate, while the holding portion has lower resistivity to minimize heat generation and maintain stable electrical and mechanical contact with the heater mount. This local differentiation of properties resolves the contradiction between heating efficiency and anchoring stability.
2Strength
If frictional powder is added to the heater to increase anchoring force, then heater mount anchoring is improved, but clean-room manufacturing conditions are compromised
Solution Approach 1:
The mechanical anchoring system is replaced with an electrostatic adhesion system. The heater mount is formed from a mouldable material that is electrostatically charged and moulded around the holding portion of the heater. This electrostatic adhesion provides strong anchoring force without requiring frictional powders or mechanical interlocking features, making the process compatible with clean-room manufacturing conditions.
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 provides enhanced anchoring, preventing the heater from loosening and ensuring stable operation even with repeated use, maintaining effective heat localization and reducing manufacturing costs by using mouldable polymers and ceramic materials.
Implementation Method 1
The heater comprises an electrically-insulating heater substrate and an electrically-resistive heating element supported by the heater substrate
Implementation Method 2
The heater mount is formed from a mouldable material that is moulded around a portion of the heater and extends through the though-hole to couple to the heater
Data Source
AI summary
An electrically heated aerosol-generating device is provided, including a heating assembly configured to heat an aerosol-forming substrate to generate an inhalable aerosol, the assembly including a heater and a heater mount, the heater being blade-shaped, including an electrically insulating heater substrate, an electrically resistive heating element supported by the heater substrate, and a through-hole through a thickness of the heater, the heater being insertable into the aerosol-forming substrate and having a length of about 10 mm to about 60 mm, a width of about 2 mm to about 10 mm, and a thickness of about 0.2 mm to about 1 mm, the mount including a moldable material molded around a portion of the heater and extending through the through-hole to couple the heater to the mount so the mount provides structural support to the heater and is configured to allow the heater to be disposed within the device.