Oriented Fiber Transfer Pads for E-Vaping Leakage Control
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Solution Overview
Problem
Existing electronic vaping devices face challenges in efficiently vaporizing pre-vapor formulations due to limitations in the design of transfer pads, which affect the aerosol mass delivery and vaporization efficiency.
Innovation Solution
The use of a transfer pad with a specific density and length, formed by a melt blowing process, that includes a plurality of fibers parallel to the longitudinal direction, providing channels for the pre-vapor formulation to flow without leakage, and a heating element that does not contact the transfer pad, ensuring efficient vaporization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transfer pad uses conventional random fiber arrangement, then the structure is simple to manufacture, but the pre-vapor formulation flows irregularly causing leakage and inconsistent vaporization
Solution Approach 1:
The patent applies local quality by creating distinct regions within the transfer pad with different fiber orientations. The first region has fibers oriented in a first direction while the second region has fibers oriented in a second direction, allowing different areas to perform specialized functions for controlling pre-vapor formulation flow and preventing leakage
2Power
If the heating element directly contacts the transfer pad, then heat transfer is efficient, but the pre-vapor formulation leaks onto the heating element causing uneven vaporization
Solution Approach 1:
The patent extracts the heating element from direct contact with the transfer pad by introducing an air gap between them. This separation prevents pre-vapor formulation leakage onto the heating element while still allowing efficient heat transfer through radiation and convection, ensuring consistent vaporization
Solution Approach 2:
The patent introduces air as an intermediary medium between the heating element and transfer pad. This air gap acts as a mediator that allows thermal energy transfer while physically preventing liquid pre-vapor formulation from contacting the heating element, thus maintaining vapor consistency
3Reliability
If the transfer pad is too dense, then it prevents formulation leakage, but it restricts flow to the heating element reducing vapor production
Solution Approach 1:
The patent applies local quality by creating regions with different fiber orientations and densities within the transfer pad. Certain regions have higher density for leakage prevention while other regions have optimized porosity to maintain adequate flow, allowing both functions to coexist in different locations
4Productivity
If the transfer pad fibers are short and randomly oriented, then manufacturing is simpler, but channels are blocked reducing formulation flow
Solution Approach 1:
The patent applies parameter changes by specifying minimum fiber length (at least 0.5mm) and orientation (substantially parallel) to create unobstructed channels for pre-vapor formulation flow, while the meltblown manufacturing process maintains feasibility for producing these longer, oriented fibers
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 enhances the aerosol mass delivery and vaporization efficiency, providing a consistent vapor production over a longer period, as demonstrated by comparative testing with varying transfer pad densities and lengths.
Implementation Method 1
The transfer pad includes a plurality of fibers. Each of the plurality of fibers is substantially parallel to the longitudinal direction. The transfer pad includes an outer side wall. The outer side wall has a coating thereon.
Implementation Method 2
An e-vaping device includes a heater element which vaporizes a pre-vapor formulation to produce a 'vapor.'
Data Source
Figure 1~2
Figure 3A~3B
Figure 4
AI summary
A cartridge (15) for an electronic vaping device comprising:an outer housing (30) extending in a longitudinal direction;a reservoir (95) configured to contain a pre-vapor formulation, the reservoir in the outer housing; at least two transfer pads (200) at a reservoir end, the transfer pads (200) including a plurality of fibers, each of the plurality of fibers being substantially parallel to the longitudinal direction; and a wick (90) in contact with the transfer pads (200).