Dynamic Vapor Sorption for Tobacco Moisture Retention Testing
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Solution Overview
Problem
Current methods for testing moisture retention in tobacco are lengthy, complex, and prone to operator and environmental influences, leading to inaccurate and non-reproducible results, and fail to capture dynamic moisture changes effectively.
Innovation Solution
A method utilizing a dynamic vapor sorption system to study moisture desorption in tobacco, where a cut tobacco sample is pretreated and weighed over time in a controlled dry environment, allowing for the calculation of a rate constant for moisture retention, which is used to evaluate tobacco and humectant moisture retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional evaluation method using saturated saline solution and thermo-hygrostat is used, then moisture retention can be tested, but the testing period is long (3-5 days) and the method is complicated requiring large numbers of repeated manual operations
Solution Approach 1:
The patent replaces the conventional mechanical/manual evaluation method using saturated saline solution and thermo-hygrostat with a dynamic vapor sorption instrument that uses controlled vapor phase mass transfer. This substitution enables automated, continuous measurement of moisture content changes, reducing the testing period from 3-5 days to a much shorter duration while maintaining measurement accuracy.
Solution Approach 2:
The dynamic vapor sorption instrument implements continuous measurement of moisture content changes in tobacco samples by continuously controlling and measuring vapor phase mass transfer. This continuous monitoring approach captures dynamic moisture desorption/absorption processes in real-time, eliminating the need for repeated manual operations at discrete time points and significantly reducing total testing time.
2Measurement precision
If conventional evaluation method is used, then moisture retention can be tested, but the result is affected by operators and operating environments causing poor accuracy and reproducibility
Solution Approach 1:
The patent replaces manual operational procedures with an automated dynamic vapor sorption instrument that precisely controls vapor phase mass transfer conditions. This automation eliminates operator variability and environmental influences, ensuring consistent and reproducible measurements across different testing sessions and laboratories.
Solution Approach 2:
The dynamic vapor sorption instrument implements precise control of critical parameters including temperature, relative humidity, and vapor phase mass transfer rate. By maintaining these parameters within tightly controlled ranges, the method achieves high reproducibility and reduces the influence of environmental variations that affect conventional methods.
3Quantity of substance
If conventional evaluation method is used, then moisture retention can be tested, but only discontinuous data points are obtained which fail to reflect tiny changes in moisture contents against time
Solution Approach 1:
The dynamic vapor sorption instrument continuously monitors moisture content changes in tobacco samples by implementing uninterrupted vapor phase mass transfer measurements. This continuous data acquisition captures subtle and rapid moisture desorption/absorption dynamics that would be missed by discrete sampling, providing a complete picture of the moisture retention process over time.
Solution Approach 2:
The patent uses vapor phase mass transfer as an intermediary mechanism to indirectly but continuously measure moisture content changes in tobacco samples. This intermediary approach allows for non-intrusive, real-time monitoring of moisture dynamics without disrupting the sample, enabling detection of tiny changes that direct measurement methods might miss.
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 significantly reduces testing time, enhances accuracy and reproducibility, and allows for the investigation of dynamic moisture changes, with a relative standard bias of less than 1.5% across multiple experiments.
Implementation Method 1
various novel dynamic vapor sorption (DVS) instruments are being constantly developed
Implementation Method 2
Dynamic rules of moisture-desorption of cut tobacco in a dry environment are studied in the present invention by using a dynamic vapor sorption system
Implementation Method 3
a cut tobacco sample is placed into a thermo-hygrostat for 48 hours to 72 hours to reach equilibrium for use
Data Source
AI summary
The present invention provides a method of testing moisture retention of tobacco in which dynamic rules on moisture desorption of the cut tobacco in a dry environment are investigated by using a dynamic vapor sorption system and has found that a dry basis moisture content at an earlier stage of moisture desorption of the cut tobacco has a preferred linear correlation with a square root of time. A linear fitting for t0.5 is made by using values of a dry basis moisture content Mt at a time point t, and a rate constant k is obtained from a slop of the obtained straight line and used as a reference of testing the moisture retention of tobacco. The method can also be used to investigate the moisture retention of tobacco and filter humectants of cigarettes. In comparison with the conventional method, the method is convenient and applicable, and has a short testing period, a high degree of automation, preferred accuracy and preferred reproducibility, etc.