Two-Stage Vaporizer Heating to Prevent Plant Material Pyrolysis
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Solution Overview
Problem
Existing vaporizers for cannabis and other plant materials face challenges in efficiently vaporizing active ingredients without pyrolysis, leading to non-uniform heating and potential wastage of the active compounds.
Innovation Solution
A vaporizer with a two-stage heating process, where the first heating step rapidly heats the plant material to just below the vaporization temperature and the second step heats it slowly to the vaporization temperature upon user inhalation, using electrodes and a temperature sensor to control the heating rates and prevent pyrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the plant material is heated rapidly to vaporization temperature, then the vaporization efficiency is improved, but the plant material undergoes pyrolysis and non-uniform heating occurs
Solution Approach 1:
The heating process is segmented into two distinct stages: a first rapid heating stage that brings the plant material close to vaporization temperature, and a second controlled heating stage that completes the vaporization. This segmentation allows the system to achieve high vaporization efficiency while avoiding pyrolysis by controlling the heating rate at different phases of the process.
Solution Approach 2:
The first heating stage performs preliminary heating to bring the plant material to a temperature close to the vaporization point without completing the full vaporization process. This preliminary action prepares the material for efficient vaporization in the second stage while preventing excessive heating that would cause pyrolysis.
2Loss of time
If the heating rate is increased to reduce heating time, then the productivity is improved, but the temperature distribution becomes non-uniform causing localized pyrolysis
Solution Approach 1:
The heating rate is made dynamic rather than constant. The system automatically adjusts the heating rate based on the thermal state of the plant material: applying high heating power initially to reduce time, then reducing power as the material approaches vaporization temperature to ensure uniform temperature distribution and prevent localized pyrolysis.
Solution Approach 2:
The system incorporates temperature monitoring and feedback control to adjust the heating rate in real-time. By detecting the temperature of the plant material and responding accordingly, the system maintains optimal heating rates that balance speed with temperature uniformity, preventing both excessive heating time and non-uniform temperature distribution.
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 method ensures uniform heating, prevents pyrolysis, and efficiently vaporizes the active ingredients, maximizing the delivery of the active compounds while minimizing wastage.
Implementation Method 1
the heating element includes one or more electrodes that heat the capsule via resistive heating, by driving a current into a portion of the capsule
Implementation Method 2
By withholding the first (rapid) stage of the heating in response to the temperature of the capsule reaching less than 95 percent of the vaporization temperature, even if the heating overshoots, the plant material is not pyrolyzed
Implementation Method 3
detecting an indication that the temperature of the plant material has reached a first temperature
Data Source
AI summary
Apparatus and methods are described for use with a vaporizer that vaporizes at least one active ingredient of a plant material. In response to receiving a first input to the vaporizer, the plant material is heated, in a first heating step. An indication of the temperature of the plant material is detected, and, in response to detecting an indication that the temperature of the plant material is at a first temperature, the first heating step is terminated, by withholding causing further temperature increase of the plant material. The first temperature is less than 95 percent of the vaporization temperature of the active ingredient. Subsequently, a second input is received at the vaporizer. In response thereto, the plant material is heated to the vaporization temperature, in a second heating step. Other applications are also described.