Combined feeding method based on tobacco leaf physical characteristics

Abstract

The invention discloses a combined feeding method based on the physical properties of tobacco leaves, including S1 measurement of surface microstructure, S2 measurement of surface hydrophilicity, S3 determination of water absorption performance grade, S4 measurement of moisture content and S5 combined feeding, and the combined feeding method is as follows: ① the weighted average moisture content of each frame of tobacco leaves is within the standard range; ② the average water absorption performance grade of each frame of tobacco leaves is between (5±1) grades; ③ the moisture content, water absorption performance and other physical properties of each frame of tobacco leaves are similar. The invention finds a quantifiable combined feeding method through a comparative study based on the microstructure of tobacco leaves, surface hydrophilicity and hydrophobicity, and moisture content, which can effectively improve the stability of the moisture content of loose moisture-regained incoming materials (after vacuum treatment), and is conducive to the steady-state control of the moisture content in the silk making process.

Description

Technical Field

[0001] The invention relates to a cigarette shred-making process, and in particular to a combined feeding method based on the physical properties of tobacco leaves. Background Art

[0002] The intrinsic quality of cigarette products is the key to whether the products are high-quality and high-end, and the moisture content of cigarettes is a key indicator affecting the intrinsic quality. Therefore, in order to achieve the above work goals, improving the batch and batch stability of moisture content in the cigarette processing process is the key.

[0003] At present, the large fluctuation of moisture content of formula tobacco is the key and direct reason for the poor batch and batch stability of moisture content in cigarette processing. The reasons for the large fluctuation of moisture content of formula tobacco are: first, the difference in tobacco years; second, the large temperature difference between morning and evening in the region and the dry continental climate make it very easy for tobacco leaves to lose moisture; third, the different internal pore structures and hydrophilicity of tobacco leaves in different regions and grades result in different abilities to absorb, store and release water. At present, the formula of cigarettes in production is fixed, and the formula of cigarettes is directly related to the sensory quality of the finished product. Therefore, the year factor cannot be improved in a short time. Tobacco factories are reducing the impact of climatic conditions on tobacco aging and moisture by establishing a "trinity" and constant temperature and humidity warehouse. However, there is still little research in the industry on the research of physical properties such as internal pore structure and hydrophilicity of formula tobacco leaves.

[0004] Therefore, in order to solve the problem of large fluctuations in moisture content in the silk making process caused by differences in moisture content of incoming raw materials, the present invention hopes to find a combined feeding method based on a comparative study of tobacco leaf microstructure, surface hydrophilicity and hydrophobicity, and moisture content, so as to improve the stability of the moisture content of loose and regained moisture incoming materials (after vacuum treatment), so as to facilitate the steady-state control of the moisture content in the silk making process. Summary of the invention

[0005] In order to overcome the above problems, the present application provides a combined feeding method based on the physical properties of tobacco leaves. The leaf group formula of a certain brand of cigarettes is taken as the research object, and the surface and cross-sectional microstructures of tobacco leaves of different grades are analyzed to study their corresponding hydrophilic and hydrophobic properties, and the moisture content of tobacco leaves is compared and analyzed. Based on the above research, a study on the combined feeding method is carried out, and finally the best combined feeding method is found to improve the stability of the moisture content of loose and rehydrated incoming materials (after vacuum treatment).

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] Combined feeding method based on the physical properties of tobacco leaves, including

[0008] S1, Measurement of surface microstructure

[0009] The surface microstructure of several different grades of tobacco leaves of a certain brand leaf group formula was tested by scanning electron microscopy. According to the difference in pore size and looseness and density of the tobacco leaf surface, different grades of tobacco leaves were divided into three gradients:

[0010] First gradient: The pores on the tobacco leaf surface are large and the structure is loose, which is conducive to water exchange with the outside world;

[0011] The second gradient: the pore size of the tobacco leaf surface is larger and the structure is looser, which is more conducive to water exchange with the outside world;

[0012] The third gradient: the surface pore size is relatively small and the structure is dense, which is not conducive to water exchange with the outside world;

[0013] S2, measurement of surface hydrophilicity

[0014] The above tobacco leaves of different grades were tested using the contact angle method;

[0015] For tobacco leaves with surface contact angles in the range of 90° to 100°, it is considered that their hydrophilicity is relatively good;

[0016] For tobacco leaves with surface contact angles in the range of 100° to 110°, their hydrophilicity is considered to be relatively poor;

[0017] For tobacco leaves with surface contact angles in the range of 110° to 120°, it is considered that their hydrophobic properties are good;

[0018] S3, Determination of water absorption performance level

[0019] The water absorption performance of tobacco leaves of different grades was arranged and combined according to the gradient of the surface microstructure of tobacco leaves and the hydrophilicity and hydrophobicity, and divided into 9 grades, and the water absorption performance grade of each grade of tobacco leaves was determined;

[0020] S4, Measurement of moisture content

[0021] Test the moisture content of tobacco leaves of different grades before feeding;

[0022] Establish a standard range of weighted average moisture content of tobacco leaves for each vacuum frame;

[0023] S5, combined feeding

[0024] The combined feeding method is:

[0025] ①The weighted average moisture content of each frame of tobacco leaves is within the standard range;

[0026] ② The average water absorption performance level of each frame of tobacco leaves is between (5±1) levels;

[0027] ③The moisture content, water absorption performance and other physical properties of each frame of tobacco leaves are similar.

[0028] As an improvement of the above technical solution, the standard range of the weighted average moisture content of tobacco leaves in each vacuum frame in step S4 is 10.7±0.5%.

[0029] The beneficial effects brought by the present invention are:

[0030] In order to reduce the problem of large fluctuations in moisture content in the silk making process caused by differences in moisture content of incoming raw materials, the present invention uses tobacco leaves of different grades in a certain brand leaf group formula as test materials, conducts test and analysis on surface microstructure, surface hydrophilicity and moisture content, and studies a combined feeding method based on the physical properties of tobacco leaves.

[0031] The principle of combined feeding is "cross-matching of tobacco leaf performance and reducing fluctuations in loose inlet". Based on this feeding method, the weighted moisture content of tobacco leaves in each vacuum frame used for a certain brand can be effectively guaranteed to be within the range of 10.7±0.5%, and the tobacco leaves can be matched according to their water absorption performance to reduce the difference in moisture content between vacuum frames, thereby improving the stability of the moisture content of loose rehumidified incoming materials (after vacuum treatment), which is beneficial to the steady-state control of moisture content in the silk making process. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] This embodiment is a combined feeding method based on the physical properties of tobacco leaves, mainly comprising:

[0034] S1, Measurement of surface microstructure

[0035] Since the specific surface area of ​​tobacco leaves before shredding is larger than that of the cross section, tobacco leaves mainly rely on the surface to exchange water with the outside world during the leaf processing section of the shredding process. The microstructure of the surface has a certain influence on the absorption and release of water.

[0036] The surface microstructure of 27 grades of tobacco leaves of a certain brand leaf group formula was tested by scanning electron microscopy. According to the difference in pore size and looseness and density of the tobacco leaf surface, different grades of tobacco leaves were divided into three gradients with reference to Table 1:

[0037] First gradient: The pores on the tobacco leaf surface are large and the structure is loose, which is conducive to water exchange with the outside world;

[0038] The second gradient: the pore size of the tobacco leaf surface is larger and the structure is looser, which is more conducive to water exchange with the outside world;

[0039] The third gradient: the surface pore size is relatively small and the structure is dense, which is not conducive to water exchange with the outside world;

[0040] Table 1 Surface microstructure gradients of 27 grades of tobacco leaves

[0041]

[0042] S2, measurement of surface hydrophilicity

[0043] The contact angle is an important parameter to characterize the hydrophilicity and hydrophobicity of the solid-liquid interface. A value greater than 90° is hydrophobic, and a value less than 90° is hydrophilic. The smaller the value, the better the hydrophilicity, i.e. the better the wetting performance. The surface hydrophilicity of tobacco leaves has a great influence on their water absorption rate, and is affected by the surface tension, density and pore size of tobacco leaves.

[0044] In this embodiment, the contact angle method is used to test the above 27 grades of tobacco leaves. The test results are shown in Table 2. The results show that the contact angles are all greater than 90°, indicating that the surface of the entire tobacco leaf is a hydrophobic structure. The surface hydrophilicity and hydrophobicity of tobacco leaves of different grades have certain differences, which we divide into three intervals;

[0045] The first interval: tobacco leaves with a surface contact angle in the range of 90° to 100° are considered to have relatively good hydrophilicity;

[0046] The second interval: tobacco leaves with a surface contact angle in the range of 100° to 110° are considered to have relatively poor hydrophilicity;

[0047] The third interval: tobacco leaves with a surface contact angle in the range of 110° to 120° are considered to have good hydrophobic properties;

[0048] Table 2 Surface contact angles of 27 grades of tobacco leaves

[0049]

[0050] S3, Determination of water absorption performance level

[0051] According to the microstructure gradient and hydrophilicity of the tobacco leaf surface, the water absorption performance of tobacco leaves of different grades was arranged and combined, and divided into 9 grades, and the water absorption performance grade of each grade of tobacco leaves was determined, as shown in Table 3;

[0052] Table 3 Tobacco leaf water absorption performance grades

[0053]

[0054] S4, Measurement of moisture content

[0055] The moisture content of tobacco leaves of different grades was tested before feeding, and the results are shown in Table 4;

[0056] Table 4 Moisture content of 27 grades of tobacco leaves

[0057]

[0058] The results showed that the moisture content of different tobacco leaves ranged from a minimum of 7.74% to a maximum of 12.69% and an average of 10.79%.

[0059] The standard range of weighted average moisture content of tobacco leaves in each vacuum frame was established to be 10.7±0.5%;

[0060] S5, combined feeding

[0061] The principle of combined feeding is "cross-matching of tobacco leaf performance and reducing fluctuations in loose inlets". The feed can be cross-fed in the order of high moisture, low, high... to ensure that the weighted moisture content of tobacco leaves in each vacuum frame used for the diamond brand is within the range of 10.7±0.5%, and the tobacco leaves are used in combination according to their water absorption performance to reduce the moisture difference between vacuum frames.

[0062] The combined feeding method is:

[0063] ①The weighted average moisture content of each frame of tobacco leaves is within the standard range;

[0064] ② The average water absorption performance level of each frame of tobacco leaves is between (5±1) levels;

[0065] ③ The moisture content, water absorption performance and other physical properties of each frame of tobacco leaves are similar;

[0066] If the physical characteristics of the vacuum frame do not meet the above rules, the combined feeding method based on the physical characteristics of the tobacco leaves can be achieved by appropriately adjusting the order of the tobacco leaves.

[0067] After combined feeding based on this method, the physical properties of tobacco leaves in each vacuum frame are shown in Table 5:

[0068] Table 5 Physical properties of tobacco leaves in each vacuum frame after combined feeding

[0069]

[0070]

[0071] After combined feeding based on this method, the standard deviation of the moisture content at the entrance of loose moisture recovery was studied. The results showed that the standard deviation of the moisture content at the entrance of loose moisture recovery was 0.30%, which was 0.18% lower than 0.48% of the original feeding method, effectively improving the stability of the moisture content of the loose moisture recovery incoming material (after vacuum treatment), which is beneficial to the steady-state control of the moisture content in the silk making process.

[0072] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined feeding method based on the physical properties of tobacco leaves, characterized in that: include S1, Measurement of surface microstructure The surface microstructure of several different grades of tobacco leaves of a certain brand leaf group formula was tested. According to the difference in the pore size and the looseness and density of the structure, the different grades of tobacco leaves were divided into three gradients: The first gradient: the pores on the tobacco leaf surface are large and the structure is loose; The second gradient: the pores on the tobacco leaf surface are larger and the structure is looser; The third gradient: the surface pore size is relatively small and the structure is dense; S2, measurement of surface hydrophilicity The contact angle method was used to test the above tobacco leaves of different grades and divide them into three intervals; The first interval: tobacco leaves with a surface contact angle ranging from 90° to 100°; The second interval: tobacco leaves with surface contact angles ranging from 100° to 110°; The third interval: tobacco leaves with a surface contact angle in the range of 110°~120°; S3, Determination of water absorption performance level The water absorption performance of tobacco leaves of different grades was arranged and combined according to the gradient of the surface microstructure of tobacco leaves and the hydrophilicity and hydrophobicity, and divided into 9 grades, and the water absorption performance grade of each grade of tobacco leaves was determined; S4, Measurement of moisture content Test the moisture content of tobacco leaves of different grades before feeding; Establish a standard range for the weighted average moisture content of tobacco leaves in each vacuum frame; the standard range for the weighted average moisture content of tobacco leaves in each vacuum frame is 10.7±0.5%; S5, combined feeding The principle of combined feeding is: cross-matching of tobacco leaf performance, reducing the fluctuation of loose inlet, and cross-feeding in the order of high, low, and high moisture content to ensure that the weighted average moisture content of tobacco leaves in each vacuum frame used for this brand is within the range of 10.7±0.5%, and the tobacco leaves are used in combination according to their water absorption performance to reduce the difference in moisture content between vacuum frames; The combined feeding method is: ①The weighted average moisture content of each frame of tobacco leaves is within the standard range; ② The average water absorption performance level of each frame of tobacco leaves is between (5±1) levels; ③The moisture content, water absorption performance and other physical properties of each frame of tobacco leaves are similar.

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