Method for evaluating glycerol adding effect in cut tobacco based on mechanical performance index

Abstract

A method for evaluating glycerol adding effect in tobacco sheet based on mechanical performance index, characterized in that: the change of mechanical properties of the sheet after adding is evaluated, n mechanical indexes including shear force, tension, penetration force and adhesion force form an n-dimensional space, the mechanical indexes of the sheet before adding glycerol are the base point, the mechanical indexes of the sheet after adding glycerol are the calculation point, the relative distance between the two points represents the comprehensive change of the mechanical properties of the sheet, and the numerical interval of the relative distance obtained by calculation is used to determine whether the glycerol adding effect is better, general or poor. The method has the advantages that: the testing process is simple and easy to operate, the testing of mechanical indexes is organically combined with the glycerol adding effect, can be used to explore the correlation between the adding effect and the subsequent cut process parameter adjustment, is scientific and reasonable, objective and feasible, and provides a new way for determining the glycerol adding effect.

Description

Technical Field

[0001] This invention relates to the field of tobacco additive detection, specifically a method for evaluating the effect of glycerin addition in tobacco leaves based on mechanical performance indicators. Background Technology

[0002] The main task of the feeding process in cigarette production is to accurately and evenly apply the feed liquid to the tobacco sheets (shredded tobacco) according to the formula, in order to improve the sensory characteristics and physical properties of the tobacco sheets. After feeding, the tobacco sheets need to be shredded. The shredding process places certain requirements on the processing resistance of the tobacco sheets. The selection of the operating parameters of the shredding machine depends on the physical properties of the tobacco sheets, especially the mechanical properties such as shear force and tensile force.

[0003] Using natural tobacco leaves as raw material to produce heated cigarette fillers can compensate for the insufficient aroma of heated cigarette products. Glycerin is an important raw material for heated cigarette smoke-generating agents. Heated cigarette products made from reconstituted tobacco leaves have certain deficiencies in terms of the natural aroma characteristics of tobacco. Therefore, producing heated cigarette fillers using natural tobacco leaves as raw material has become a new research direction. The smoke-generating agents of heated cigarettes mainly consist of glycerin, propylene glycol, etc., and their addition amount is generally required to be about 15-20%. The addition of glycerin and the moisture content of tobacco leaves will affect the mechanical properties of tobacco leaves. In order to make full use of the existing process equipment on the production line, it is necessary to evaluate the performance of the tobacco leaves after adding glycerin solution in various aspects. Under the premise of meeting production requirements, the addition ratio should be adapted to the operating parameters of the existing equipment.

[0004] Currently, the evaluation of feeding effect focuses on feeding amount detection, feeding uniformity, material utilization rate, and feeding accuracy. The above evaluation methods are only feedback on the feeding effect of the completed process, while there is little research on the evaluation of the mechanical properties of tobacco sheets that are of concern in the subsequent shredding process. Summary of the Invention

[0005] The purpose of this invention is to provide a method for evaluating the effect of adding glycerin to tobacco flakes, based on the above-mentioned application background and the current state of the technology.

[0006] The working mechanism of this invention is as follows: It evaluates the changes in the mechanical properties of tobacco flakes after glycerin addition. n mechanical indices (including shear force, tensile force, penetration force, and adhesion force) form an n-dimensional space. The mechanical indices of the tobacco flakes before glycerin addition serve as the baseline, and the mechanical indices of the tobacco flakes after glycerin addition serve as the calculation points. The relative distance between the two points characterizes the comprehensive change in the mechanical properties of the tobacco flakes.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A method for evaluating the effect of glycerol addition in tobacco leaves based on mechanical performance indicators, the specific steps of which are as follows:

[0009] Step 1: Balance the tobacco slices without glycerol solution for more than 48 hours under certain temperature and humidity conditions to make the moisture content of the tobacco slices between 18% and 20%.

[0010] Step 2: Balance the tobacco slices added with glycerol solution of the same batch for more than 48 hours under certain temperature and humidity conditions. The mass ratio of the added glycerol solution is 5% - 15%. The moisture content of the balanced tobacco slices is not tested.

[0011] Step 3: Use a texture analyzer to detect the mechanical property indexes of the tobacco slices, such as shear force, tensile force, penetration force, and adhesion force. In principle, each mechanical index is obtained by repeating the operation more than 10 times, and the average value is taken as the final result.

[0012] Step 4: Determine the evaluation standard for the mechanical properties of the tobacco slices. Take the mechanical indexes of the tobacco slices without glycerol solution as the benchmark , and measure the coordinates of the tobacco slices after adding the material as , where are n different mechanical indexes of the tobacco slices respectively; use the relative distance l of the two-point coordinates in the n-dimensional space to characterize the comprehensive change range of the mechanical properties of the tobacco slices after adding glycerol solution. It is obtained by deformation based on the concept of data dispersion.

[0013] Use n to represent the relative distance of the above two points in the l -dimensional space.

[0014] , it can be known that l is a dimensionless number, and 0 ≤ l≤ ≤ 100%;

[0015] Step 5: Determine the evaluation rules

[0016] l When < x, the comprehensive change of the mechanical indexes of the tobacco slices is small, the working parameters of the slicing machine do not need to be adjusted, and the feeding effect is good;

[0017] When x ≤ l < y, the comprehensive change of the mechanical indexes of the tobacco slices is moderate, and the feeding effect is average;

[0018] l≥ When < y, the comprehensive change of the mechanical indexes of the tobacco slices is large, and the feeding effect is poor.

[0019] The concentration of the glycerol solution described in Step 2 is 60% - 80%.

[0020] In the present invention, Step 1 and Step 2 are parallel operations and can be interchanged.

[0021] The advantages of this invention are: the testing process is simple and easy to operate, and it organically combines the testing of mechanical properties with the effect of glycerin feeding. It can be used to explore the correlation between the feeding effect and the subsequent adjustment of shredding process parameters. It is scientific, reasonable, objective and feasible, and provides a brand-new way to determine the effect of glycerin feeding. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the evaluation method. Detailed Implementation

[0023] The operation process and principle of the present invention will be further explained below with reference to the embodiments (with accompanying drawings): The sample is a domestic brand of tobacco leaf processed in the addition process. Example

[0024] Step 1: Equilibrate the tobacco sheets without added glycerin solution under certain temperature and humidity conditions for more than 48 hours, so that the moisture content of the tobacco sheets is between 18% and 20%.

[0025] Step 2: Equilibrate the tobacco sheets with added glycerin solution for at least 48 hours under certain temperature and humidity conditions. The mass ratio of added glycerin solution is 5%~15%. Do not test the moisture content of the equilibrated tobacco sheets.

[0026] Step 3: Use a texture analyzer to test the mechanical properties of the tobacco sheets, including shear force, tensile force, penetration force, and adhesion force. Each mechanical property should be measured at least 10 times, and the average value should be taken as the final result. For ease of description, shear force and tensile force are used as the measurement indicators, and the results are shown in the table below.

[0027] Shear force / g Tensile force / g Penetration force / g Adhesion force / g Unfilled sheet tobacco 270 410 159 125 Filled sheet tobacco 235 422 182 140

[0028] Step 4: Determine the evaluation criteria for the mechanical properties of tobacco flakes. The mechanical properties of unprocessed tobacco flakes will be used as the benchmark. The coordinates of the tobacco flakes after adding glycerin solution were measured as follows: ,in These are the shear force, tensile force, penetrating force, and adhesive force of the tobacco leaf. The relative distance between the coordinates of these two points in two-dimensional space is used as the metric. l The overall change in the mechanical properties of tobacco flakes after the addition of glycerol solution is characterized.

[0029] use Two The relative distance between the two points mentioned above in 3D space l express,

[0030] Substituting the measured data into this formula, we get... l =25.60%.

[0031] Step 5: Determine the evaluation rules. lWhen the content is <10%, the overall change in the mechanical properties of the tobacco is small, the operating parameters of the shredder do not need to be adjusted, and the feeding effect is good; when the content is ≤10%, the overall change in the mechanical properties of the tobacco is small, the operating parameters of the shredder do not need to be adjusted, and the feeding effect is good. l When the content is less than 20%, the overall change in the mechanical properties of tobacco is moderate, and the effect of adding feed is average. l≥ At 20%, the overall mechanical properties of tobacco flakes change significantly, resulting in a poor feeding effect.

[0032] According to the above evaluation rules, the effect of this batch of tobacco flakes with added glycerin solution is rated as poor.

Claims

1. A method for evaluating the effect of glycerin addition in tobacco leaves based on mechanical performance indicators, characterized in that: The changes in the mechanical properties of tobacco flakes after glycerin addition are evaluated. An n-dimensional space is formed by n mechanical indices, including shear force, tensile force, penetration force, and adhesion force. The mechanical indices of the tobacco flakes before glycerin addition serve as the baseline, and the mechanical indices of the tobacco flakes after glycerin addition serve as the calculation points. The relative distance between the two points characterizes the comprehensive change in the mechanical properties of the tobacco flakes. The specific steps are as follows: Step 1: Equilibrate the tobacco sheets without added glycerin solution under certain temperature and humidity conditions for more than 48 hours, so that the moisture content of the tobacco sheets is between 18% and 20%. Step 2: Equilibrate the tobacco sheets of the same batch after adding glycerin solution for more than 48 hours under certain temperature and humidity conditions. The mass ratio of glycerin solution added is 5%~15%. Do not test the moisture content of the equilibrated tobacco sheets. Step 3: Use a texture analyzer to test the shear force, tensile force, penetration force, and adhesion force of the tobacco sheets. In principle, each mechanical property should be obtained by repeating the operation more than 10 times and taking the average value as the final result. Step 4: Determine the evaluation criteria for the mechanical properties of tobacco flakes, using the mechanical properties of tobacco flakes without added glycerin as the benchmark. The coordinates of the tobacco leaf after the additive was measured as follows: ,in These are n different mechanical properties of a piece of tobacco; the relative distance between the coordinates of the two points mentioned above in n-dimensional space. l The comprehensive change in the mechanical properties of tobacco flakes after the addition of glycerin solution is characterized by a modified version of the concept of reference data dispersion. use n The relative distance between the two points mentioned above in 3D space l express, It can be known that l It is a dimensionless number, 0≤ l≤ 100%; Step 5: Determine the evaluation rules l When the content is less than 10%, the overall mechanical properties of the tobacco flakes change little, the operating parameters of the shredder do not need to be adjusted, and the feeding effect is good. 10%≤ l When the content is less than 20%, the overall change in the mechanical properties of tobacco is moderate, and the effect of adding feed is average. l≥ At 20%, the overall mechanical properties of tobacco flakes change significantly, resulting in a poor feeding effect.

2. The method according to claim 1, characterized in that: The concentration of the glycerol solution in step two is 60%-80%.

3. The method according to claim 1, characterized in that: Step one and step two are parallel operations, and their order can be changed.

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