阅读说明：本技术 烟丝含水率控制方法 (Method for controlling moisture content of cut tobacco ) 是由 邓宏博 江家森 谢金栋 李斌 洪伟龄 张炜 陈冬滨 张大波 罗登炎 李金兰 于 2019-11-05 设计创作，主要内容包括：本发明公开了一种烟丝含水率控制方法,涉及烟草加工技术领域,用以优化成品烟丝的质量。该烟丝含水率控制方法,包括以下步骤：确定烟丝的理论含水率；根据烟丝等温吸附脱附特性曲线以及烟丝的理论含水率计算烟丝的理论相对湿度；根据烟丝的理论相对湿度,计算烟丝的各组成成分的目标相对湿度；根据烟丝的各组成成分的目标相对湿度,计算烟丝的各组成成分的目标含水率。根据上述技术方案可得到烟丝各组成成分的目标含水率。在卷烟制丝过程中,将烟丝各组成成分的目标含水率作为控制各组成成分生产的目标。在后续混合参配后,叶丝、梗丝、膨胀烟丝相互之间很少、甚至基本不会发生水分迁移现象,大大提高了成品烟的质量。(The invention discloses a method for controlling the moisture content of cut tobacco, relates to the technical field of tobacco processing, and is used for optimizing the quality of finished cut tobacco. The method for controlling the moisture content of the cut tobacco comprises the following steps: determining the theoretical water content of the cut tobacco; calculating theoretical relative humidity of the tobacco shreds according to the isothermal adsorption and desorption characteristic curve of the tobacco shreds and the theoretical water content of the tobacco shreds; calculating the target relative humidity of each component of the tobacco shreds according to the theoretical relative humidity of the tobacco shreds; and calculating the target water content of each component of the tobacco shreds according to the target relative humidity of each component of the tobacco shreds. According to the technical scheme, the target water content of each component of the cut tobacco can be obtained. In the cigarette shredding process, the target moisture content of each component of the tobacco shreds is used as the target for controlling the production of each component. After subsequent mixed blending, the leaf shreds, the stem shreds and the expanded cut tobacco have little or even almost no moisture migration phenomenon, and the quality of finished cigarettes is greatly improved.)

1. The cut tobacco moisture content control method is characterized by comprising the following steps:

determining the theoretical water content of the cut tobacco;

calculating theoretical relative humidity of the tobacco shreds according to the isothermal adsorption and desorption characteristic curve of the tobacco shreds and the theoretical water content of the tobacco shreds;

calculating the target relative humidity of each component of the tobacco shreds according to the theoretical relative humidity of the tobacco shreds;

and calculating the target water content of each component of the tobacco shreds according to the target relative humidity of each component of the tobacco shreds.

2. The cut tobacco moisture content control method according to claim 1, characterized by further comprising the steps of:

and adjusting the humidity of the storage environment to be equal to the theoretical relative humidity of the cut tobacco, and storing the cut tobacco until the actual moisture content of the cut tobacco is equal to the target moisture content of the cut tobacco.

3. The cut tobacco moisture content control method according to claim 1, characterized by further comprising the steps of: in the manufacturing process of each component of the tobacco shreds, the water content of each component of the tobacco shreds is respectively adjusted to be equal to the target water content of each component of the tobacco shreds.

4. The cut tobacco moisture content control method according to claim 1, wherein each component of the cut tobacco comprises: leaf shreds, stalk shreds, and expanded tobacco shreds.

5. The cut tobacco moisture content control method according to claim 4, wherein target relative humidity of the cut tobacco, the cut leaf, the cut stem and the expanded cut tobacco is equal.

6. The cut tobacco moisture content control method according to claim 5, wherein the target relative humidity of the cut tobacco, the cut leaf, the cut stem and the expanded cut tobacco is 58-62%.

7. The method of controlling moisture content in cut tobacco according to claim 4,

the target water content of the cut tobacco is 11.5% -11.7%; and/or the presence of a gas in the gas,

the target water content of the cut stems is 12.5% -12.7%; and/or the presence of a gas in the gas,

the target water content of the expanded tobacco shreds is 12.2-12.4%.

8. The cut tobacco moisture content control method according to claim 1, characterized in that the theoretical moisture content of the cut tobacco is 11.9-12.1%.

9. The cut tobacco moisture content control method according to claim 4, wherein the calculating of the target moisture content of each component of the cut tobacco according to the target relative humidity of each component of the cut tobacco comprises the steps of:

calculating to obtain the target moisture content of the cut tobacco according to the target relative humidity of the cut tobacco and the isothermal adsorption and desorption characteristic curve of the cut tobacco;

calculating to obtain the target water content of the cut stems according to the target relative humidity of the cut stems and the isothermal adsorption and desorption characteristic curve of the cut stems;

and calculating to obtain the target water content of the expanded tobacco according to the target relative humidity of the expanded tobacco and the isothermal adsorption and desorption characteristic curve of the expanded tobacco.

10. The cut tobacco moisture content control method according to claim 9, wherein the cut tobacco isothermal adsorption and desorption characteristic curve comprises a cut tobacco isothermal adsorption characteristic curve and a cut tobacco isothermal desorption characteristic curve; the leaf thread isothermal adsorption characteristic curve and the leaf thread isothermal desorption characteristic curve are cubic functions of the moisture content of the leaf threads and the relative humidity of the leaf threads, and constants of the leaf threads are different.

11. The cut tobacco moisture content control method according to claim 9, wherein the cut stem isothermal adsorption and desorption characteristic curve comprises a cut stem isothermal adsorption characteristic curve and a cut stem isothermal desorption characteristic curve; the stem isothermal adsorption characteristic curve and the stem isothermal desorption characteristic curve are cubic functions of the moisture content of the stem and the relative humidity of the stem, and constants of the stem isothermal adsorption characteristic curve and the stem isothermal desorption characteristic curve are different.

12. The cut tobacco moisture content control method according to claim 9, wherein the expanded cut tobacco isothermal adsorption and desorption characteristic curve comprises an expanded cut tobacco isothermal adsorption characteristic curve and an expanded cut tobacco isothermal desorption characteristic curve; the expanded cut tobacco isothermal adsorption characteristic curve and the expanded cut tobacco isothermal desorption characteristic curve are cubic functions of the water content of the expanded cut tobacco and the relative humidity of the expanded cut tobacco, and constants of the curve are different.

13. The cut tobacco moisture content control method according to claim 1, wherein the cut tobacco isothermal adsorption and desorption characteristic curve comprises a cut tobacco isothermal adsorption characteristic curve and a cut tobacco isothermal desorption characteristic curve; the tobacco shred isothermal adsorption characteristic curve and the tobacco shred isothermal desorption characteristic curve are cubic functions of the water content and the relative humidity, and constants of the tobacco shred isothermal adsorption characteristic curve and the tobacco shred isothermal desorption characteristic curve are different.

Technical Field

The invention relates to the technical field of tobacco processing, in particular to a method for controlling the moisture content of cut tobacco.

Background

The cut tobacco in the cigarette product is a porous medium consisting of complex organic substances. In the tobacco processing process, the moisture control of tobacco leaves (or tobacco shreds) is an important content of processing quality control, and the moisture regaining, absorbing, drying and dehumidifying processes of tobacco directly influence the quality of products.

Disclosure of Invention

The invention provides a method for controlling the moisture content of cut tobacco, which is used for optimizing the quality of finished cut tobacco.

The embodiment of the invention provides a method for controlling the moisture content of cut tobacco, which comprises the following steps:

determining the theoretical water content of the cut tobacco;

calculating theoretical relative humidity of the tobacco shreds according to the isothermal adsorption and desorption characteristic curve of the tobacco shreds and the theoretical water content of the tobacco shreds;

calculating the target relative humidity of each component of the tobacco shreds according to the theoretical relative humidity of the tobacco shreds;

and calculating the target water content of each component of the tobacco shreds according to the target relative humidity of each component of the tobacco shreds.

In some embodiments, the method for controlling moisture content of cut tobacco further comprises the following steps:

and adjusting the humidity of the storage environment temperature to be equal to the theoretical relative humidity of the cut tobacco, and storing the cut tobacco until the actual moisture content of the cut tobacco is equal to the target moisture content of the cut tobacco.

In some embodiments, the method for controlling moisture content of cut tobacco further comprises the following steps: in the manufacturing process of each component of the tobacco shreds, the water content of each component of the tobacco shreds is respectively adjusted to be equal to the target water content of each component of the tobacco shreds.

In some embodiments, the tobacco shred comprises the following components: leaf shreds, stalk shreds, and expanded tobacco shreds.

In some embodiments, the target relative humidity of the cut tobacco, the cut leaf, the cut stem, and the expanded cut tobacco is equal.

In some embodiments, the target relative humidity of the cut tobacco, the cut leaf, the cut stem, and the expanded cut tobacco is 58% to 62%.

In some embodiments, the target moisture content of the cut leaf is 11.5% to 11.7%; and/or the target moisture content of the cut stems is 12.5% -12.7%; and/or the target water content of the expanded cut tobacco is 12.2-12.4%.

In some embodiments, the theoretical moisture content of the tobacco shred is between 11.9% and 12.1%.

In some embodiments, the calculating the target moisture content of each component of the cut tobacco according to the target relative humidity of each component of the cut tobacco includes:

calculating to obtain the target moisture content of the cut tobacco according to the target relative humidity of the cut tobacco and the isothermal adsorption and desorption characteristic curve of the cut tobacco;

calculating to obtain the target water content of the cut stems according to the target relative humidity of the cut stems and the isothermal adsorption and desorption characteristic curve of the cut stems;

and calculating to obtain the target water content of the expanded tobacco according to the target relative humidity of the expanded tobacco and the isothermal adsorption and desorption characteristic curve of the expanded tobacco.

In some embodiments, the cut leaf isothermal adsorption and desorption characteristic curve comprises a cut leaf isothermal adsorption characteristic curve and a cut leaf isothermal desorption characteristic curve; the leaf thread isothermal adsorption characteristic curve and the leaf thread isothermal desorption characteristic curve are cubic functions of the moisture content of the leaf threads and the relative humidity of the leaf threads, and constants of the leaf threads are different.

In some embodiments, the cut stem isothermal adsorption and desorption characteristic curve comprises a cut stem isothermal adsorption characteristic curve and a cut stem isothermal desorption characteristic curve; the stem isothermal adsorption characteristic curve and the stem isothermal desorption characteristic curve are cubic functions of the moisture content of the stem and the relative humidity of the stem, and constants of the stem isothermal adsorption characteristic curve and the stem isothermal desorption characteristic curve are different.

In some embodiments, the expanded tobacco isothermal adsorption and desorption characteristic curve comprises an expanded tobacco isothermal adsorption characteristic curve and an expanded tobacco isothermal desorption characteristic curve; the expanded cut tobacco isothermal adsorption characteristic curve and the expanded cut tobacco isothermal desorption characteristic curve are cubic functions of the water content of the expanded cut tobacco and the relative humidity of the expanded cut tobacco, and constants of the curve are different.

In some embodiments, the tobacco shred isothermal adsorption and desorption characteristic curve comprises a tobacco shred isothermal adsorption characteristic curve and a tobacco shred isothermal desorption characteristic curve; the tobacco shred isothermal adsorption characteristic curve and the tobacco shred isothermal desorption characteristic curve are cubic functions of the water content and the relative humidity, and constants of the tobacco shred isothermal adsorption characteristic curve and the tobacco shred isothermal desorption characteristic curve are different.

According to the tobacco shred water content control method provided by the technical scheme, the target water content of each component of the tobacco shred is determined, so that the components (such as leaf shreds, stem shreds and expanded tobacco shreds) of the tobacco shred do not migrate to each other when a finished tobacco bale product is stored. In the production and blending links of each material in the cigarette shred manufacturing process, the target moisture content of each component of the tobacco shreds is used as the target for controlling the production of each component, and the actual moisture content of the tobacco shreds, the cut stems and the expanded tobacco shreds obtained by production and manufacturing is basically consistent with the target moisture content of each component. After subsequent mixing and blending, the cut tobacco leaves, the cut stems and the expanded cut tobacco have little or even almost no moisture migration phenomenon, and the quality of the finished cut tobacco is greatly improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic flow chart of a cut tobacco moisture content control method according to an embodiment of the present invention;

fig. 2 is an isothermal adsorption-desorption characteristic curve of tobacco shreds provided by the embodiment of the invention;

fig. 3 is a characteristic curve of isothermal adsorption and desorption of cut tobacco provided by the embodiment of the present invention;

fig. 4 is an isothermal adsorption and desorption characteristic curve of cut stem provided in the embodiment of the present invention;

fig. 5 is an isothermal adsorption and desorption characteristic curve of the expanded tobacco provided by the embodiment of the invention.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 5.

The isothermal adsorption and desorption performance reflects the adsorption and desorption amount of moisture contained in the material (such as tobacco leaves and cut tobacco) under specified conditions. How to quickly, simply and accurately test and evaluate the moisture absorption and desorption performance of the tobacco sheets or the tobacco shreds is one of the key points of the current tobacco industry research.

In the process of producing cut tobacco in cigarette production, the cut tobacco is formed by mixing cut tobacco leaves, cut stems and expanded cut tobacco according to a certain mixing proportion. The water content of the tobacco shred is determined by the water content of the cut tobacco, the cut stem and the expanded tobacco shred and the mixing proportion of the three materials.

The embodiment of the invention provides a method for controlling the moisture content of cut tobacco, which comprises the following steps:

and step S10, determining the theoretical water content of the cut tobacco.

The theoretical water content of the cut tobacco is selected by referring to an industry standard, or determined according to parameters such as temperature, humidity and cut tobacco quality of an actual environment. For example, the theoretical moisture content of the selected tobacco shreds is 12%.

And step S20, calculating the theoretical relative humidity of the tobacco shreds according to the isothermal adsorption and desorption characteristic curve of the tobacco shreds and the theoretical water content of the tobacco shreds.

The tobacco shred isothermal adsorption and desorption characteristic curve comprises a tobacco shred isothermal adsorption characteristic curve and a tobacco shred isothermal desorption characteristic curve.

In some embodiments, the isothermal adsorption and desorption characteristic curves of the components of the tobacco shreds satisfy the following formulas:

y＝f(T℃,x)＝ax³-bx²+cx-d

in the formula, T is the ambient temperature, y is the moisture content of each component of the tobacco shreds, and x is the relative humidity of each component of the tobacco shreds. a. b, c and d are constants, and the constants are not equal for all components of the cut tobacco. For the adsorption and desorption curves of the same component, the constant values are not equal.

In some embodiments, the tobacco shred isothermal adsorption and desorption characteristic curve comprises a tobacco shred isothermal adsorption characteristic curve and a tobacco shred isothermal desorption characteristic curve; the tobacco shred isothermal adsorption characteristic curve and the tobacco shred isothermal desorption characteristic curve are cubic functions of theoretical moisture content and theoretical relative humidity, and constants of the tobacco shred isothermal adsorption characteristic curve and the tobacco shred isothermal desorption characteristic curve are different.

As shown in fig. 2, the isothermal adsorption characteristic curve of the tobacco shred and the isothermal desorption characteristic curve of the tobacco shred do not completely overlap. In the area with the water content and the relative humidity lower than the water content and the relative humidity corresponding to A1 point, the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of the cut tobacco almost coincide. In the area with the water content and the relative humidity higher than those corresponding to A1, the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of the cut tobacco have larger difference.

The theoretical relative humidity of the cut tobacco calculated in step S20 preferably satisfies both the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of the cut tobacco. By adopting the theoretical relative humidity of the cut tobacco, the performance of the cut tobacco is not influenced by the environment of the cut tobacco, and the performance of the cut tobacco can be guaranteed no matter the cut tobacco is in an adsorption environment or a desorption environment.

And step S30, calculating the target relative humidity of each component of the tobacco shreds according to the theoretical relative humidity of the tobacco shreds.

In some embodiments, the theoretical relative humidity of the cut tobacco is taken as the target relative humidity for each constituent component of the cut tobacco.

Specifically, after the theoretical relative humidity of the cut tobacco is determined, the target relative humidity of the cut tobacco, the cut stem and the expanded cut tobacco is determined.

The target relative humidity ratios of the cut tobacco leaves, the cut stem and the expanded cut tobacco are the same and are equal to the theoretical relative humidity of the cut tobacco.

And step S40, calculating the target water content of each component of the tobacco shreds according to the target relative humidity of each component of the tobacco shreds.

The tobacco shreds comprise the following components: the cut tobacco leaves, the cut stem and the expanded cut tobacco respectively have isothermal adsorption characteristic curves. The target water content of each component is determined from the respective isothermal adsorption characteristic curves, and then the target water content is used to guide the manufacturing process of each component.

The implementation of step S40 will be described in detail later.

After the above step S20, the theoretical relative humidity of the cut tobacco can be obtained. According to the theoretical relative humidity, the actual moisture content of the cut tobacco can be adjusted, so that the actual moisture content of the cut tobacco is equal to the theoretical moisture content of the cut tobacco. The specific adjustment method is step S50 described below.

In some embodiments, the method for controlling moisture content of cut tobacco further comprises the following steps:

and S50, adjusting the humidity of the storage environment temperature to be equal to the theoretical relative humidity of the cut tobacco, and storing the cut tobacco until the actual moisture content of the cut tobacco is equal to the target moisture content of the cut tobacco.

The method for controlling the moisture content of the cut tobacco is integrated control, and the basic principle is as follows: and when the first control model is constructed, determining the theoretical water content of the tobacco shreds according to the storage environment of the actual tobacco shreds. And the theoretical relative humidity of the cut tobacco obtained by calculation according to the theoretical moisture content of the cut tobacco is used as a control index for storing the cut tobacco, and the storage environment of the cut tobacco is reversely controlled. Next, since the storage environment of the cut tobacco is changed, the theoretical moisture content of the cut tobacco is corrected according to the changed storage environment of the cut tobacco, that is, the above steps S10 to S40 are repeated until the actual moisture content and the relative humidity of the cut tobacco meet the theoretical requirements.

The above step S50 is located after step S10, for example.

In some embodiments, the method for controlling moisture content of cut tobacco further comprises the following steps: in the manufacturing process of each component of the tobacco shreds, the water content of each component of the tobacco shreds is respectively adjusted to be equal to the target water content of each component of the tobacco shreds.

The target moisture content of each component obtained in the above step S40 is used as a production control index parameter, and the target moisture content of each component is controlled based on the index parameter to obtain each component of the cut tobacco having a desired moisture content. And then mixing the components according to a set proportion to obtain the finished cut tobacco.

When the obtained cut tobacco is stored in an actual environment, the actual water content and the actual relative humidity of the obtained cut tobacco are consistent with the theoretical water content and the theoretical relative humidity, and the moisture migration between the components (namely the cut tobacco, the cut stem and the expanded cut tobacco) can not occur basically in the storage process of the cut tobacco, so that the quality of the cut tobacco is stable and controllable.

The tobacco shred moisture (namely the tobacco shred moisture content) is an important index for controlling the cigarette quality, and has obvious influence on the sensory quality of the cigarette. Although the isothermal adsorption and desorption characteristics of the blending materials, namely the cut tobacco, the cut stem and the expanded cut tobacco in the cut tobacco are different, in the cut tobacco water content control method, the respective differences are fully considered, so that the target water content of each component finally obtained after regulation and control is the same as the required water content, the water among cut tobacco components cannot migrate after mixing and blending, and the water control of the cut tobacco is stable and controllable.

By adopting the method for controlling the moisture content of the cut tobacco, the theoretical relative humidity of the finished cut tobacco is obtained by calculation according to the theoretical moisture content of the finished cut tobacco. And then the theoretical relative humidity of the finished cut tobacco is used as the target relative humidity of each component of the cut tobacco. And calculating the target water content of each component of the tobacco shreds according to the target relative humidity of each component of the tobacco shreds and the isothermal adsorption and desorption characteristic curve of each component of the tobacco shreds. And controlling the processing and manufacturing processes of the components of the tobacco shreds by using the target water content of each component, so that the water content of each component of the tobacco shreds obtained by processing and manufacturing is equal to the respective target water content. Therefore, after subsequent mixing and blending, moisture migration among the components of the cut tobacco does not occur, and the product quality of the finished cut tobacco is improved.

As mentioned above, the composition of the cut tobacco comprises: leaf shreds, stalk shreds, and expanded tobacco shreds. The cut tobacco is prepared by mixing cut tobacco leaves, cut stems and expanded cut tobacco according to a certain mixing proportion.

By adopting the method for controlling the moisture content of the tobacco shreds, the self isothermal adsorption and desorption characteristic curve of each component can be constructed regardless of several components of the tobacco shreds. And the target relative humidity of each component of the tobacco shreds is the same, so that moisture migration among the components of the tobacco shreds cannot occur in the subsequent blending process. Moreover, by adopting the method for controlling the moisture content of the cut tobacco, the cut tobacco with the required target moisture content can be obtained only by changing the process parameters in the production process without changing the parameters such as the shapes of cut tobacco, cut stems and expanded cut tobacco.

As mentioned above, the target relative humidity ratios of the cut leaves, cut stems and expanded tobacco shreds are, for example, completely the same or substantially the same.

In some embodiments, the target relative humidity of the leaf filaments is 58% to 62%.

The cut tobacco adopts the target relative humidity, and the value can simultaneously meet the requirements of an isothermal adsorption characteristic curve and an isothermal desorption characteristic curve of the cut tobacco, so that the quality of the cut tobacco is relatively stable in adsorption and desorption environments.

In some embodiments, the cut rolled stems have a target relative humidity of 58% to 62%.

The stem shreds adopt the target relative humidity, and the value can meet the requirements of an isothermal adsorption characteristic curve and an isothermal desorption characteristic curve of the stem shreds at the same time, so that the quality of the stem shreds is stable in adsorption and desorption environments.

In some embodiments, the expanded tobacco has a target relative humidity of 58% to 62%.

The expanded cut tobacco adopts the target relative humidity, and the value can meet the requirements of an isothermal adsorption characteristic curve and an isothermal desorption characteristic curve of the expanded cut tobacco at the same time, so that the quality of the expanded cut tobacco is stable in adsorption or desorption environments.

From the above analysis, it can be seen that the theoretical relative humidity of the selected tobacco shreds not only needs to satisfy the requirements of the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of the tobacco shreds, but also needs to satisfy the requirements of the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of each of the cut tobacco shreds, the cut stems and the expanded tobacco shreds.

In some embodiments, the target moisture content of the cut leaf is 11.5% to 11.7%.

The isothermal adsorption characteristic curve of the tobacco shreds is different from the isothermal adsorption characteristic curve of the tobacco shreds, and the isothermal desorption characteristic curve of the tobacco shreds is different from the isothermal desorption characteristic curve of the tobacco shreds. Even if the target relative humidity of the cut tobacco is the same as the theoretical relative humidity of the cut tobacco, the obtained target moisture content of the cut tobacco is different from the theoretical moisture content of the cut tobacco.

In some embodiments, the target moisture content of the cut rolled stems is between 12.5% and 12.7%. Specifically, the content is 12.5%, 12.6%, 12.7%.

The stem isothermal adsorption characteristic curve is different from the tobacco shred isothermal adsorption characteristic curve, and the stem isothermal desorption characteristic curve is different from the tobacco shred and tobacco shred isothermal desorption characteristic curves. Even if the target relative humidity of the cut stems and the cut tobacco and the theoretical relative humidity of the cut tobacco are the same, the obtained target moisture content of the cut stems is different from the target moisture content of the cut tobacco and the theoretical moisture content of the cut tobacco.

In some embodiments, the target moisture content of the expanded tobacco is 12.2% to 12.4%. Specifically, the content is 12.2%, 12.3%, 12.4%.

The isothermal adsorption characteristic curve of the expanded cut tobacco is different from the isothermal adsorption characteristic curves of cut tobacco, cut stem and cut tobacco, and the isothermal desorption characteristic curve of the expanded cut tobacco is different from the isothermal desorption characteristic curves of the cut tobacco, the cut tobacco and the cut stem. Even if the target relative humidity of the expanded cut tobacco, the stem shreds and the cut tobacco and the theoretical relative humidity of the cut tobacco are the same, the obtained target water content of the expanded cut tobacco is different from the target water content of the stem shreds, the target water content of the cut tobacco and the theoretical water content of the cut tobacco.

In some embodiments, the theoretical moisture content of the tobacco shred is between 11.9% and 12.1%. Specifically, the content is 11.9%, 12%, 12.1%.

In actual production, the theoretical moisture content of the cut tobacco is determined according to actual storage environment, the area and the like.

In some embodiments, the theoretical relative humidity of the tobacco shred is between 58% and 62%.

In some embodiments, the target relative humidity of the constituent components of the tobacco thread is equal to the theoretical relative humidity of the tobacco thread. By adopting the technical scheme, the mutual migration of moisture among all the components of the cut tobacco is effectively prevented, and the quality of the finished cut tobacco is ensured.

The implementation of step S40 is described in detail below.

In some embodiments, the calculating the target moisture content of each component of the cut tobacco according to the target relative humidity of each component of the cut tobacco includes:

step one, calculating to obtain the target moisture content of the cut tobacco according to the target relative humidity of the cut tobacco and the isothermal adsorption and desorption characteristic curve of the cut tobacco.

Referring to fig. 3, in the region where the water content and the relative humidity are both lower than those corresponding to point a2, the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of the cut tobacco almost coincide. In the area with the water content and the relative humidity higher than those corresponding to A2, the isothermal adsorption characteristic curve and the isothermal desorption characteristic curve of the cut tobacco have larger difference.

And step two, calculating to obtain the target water content of the cut stems according to the target relative humidity of the cut stems and the isothermal adsorption and desorption characteristic curve of the cut stems.

Referring to fig. 4, the isothermal adsorption characteristic curve of the cut stems and the isothermal desorption characteristic curve of the cut stems almost coincide.

And step three, calculating to obtain the target water content of the expanded tobacco shreds according to the target relative humidity of the expanded tobacco shreds and the isothermal adsorption and desorption characteristic curve of the expanded tobacco shreds.

Referring to fig. 5, the isothermal adsorption characteristic curve of the expanded cut tobacco and the isothermal desorption characteristic curve of the expanded cut tobacco almost coincide.

The first step, the second step and the third step are not divided into a front step and a rear step.

The adsorption and desorption characteristic curve of the material comprises an adsorption characteristic curve and a desorption characteristic curve. Both the adsorption characteristic curve and the desorption characteristic curve satisfy the following equations, but constants are different. The material includes tobacco shred, leaf shred, stem shred, and expanded tobacco shred.

y＝f(T℃,x)＝ax³-bx²+cx+d

Wherein, y is the moisture content of the material, and x is the relative humidity of the material.

In some embodiments, the cut leaf isothermal adsorption and desorption characteristic curve comprises a cut leaf isothermal adsorption characteristic curve and a cut leaf isothermal desorption characteristic curve; the leaf thread isothermal adsorption characteristic curve and the leaf thread isothermal desorption characteristic curve are cubic functions of the moisture content of the leaf threads and the relative humidity of the leaf threads, and constants of the leaf threads are different.

In some embodiments, the cut stem isothermal adsorption and desorption characteristic curve comprises a cut stem isothermal adsorption characteristic curve and a cut stem isothermal desorption characteristic curve; the stem isothermal adsorption characteristic curve and the stem isothermal desorption characteristic curve are cubic functions of the moisture content of the stem and the relative humidity of the stem, and constants of the stem isothermal adsorption characteristic curve and the stem isothermal desorption characteristic curve are different.

In some embodiments, the expanded tobacco isothermal adsorption and desorption characteristic curve comprises an expanded tobacco isothermal adsorption characteristic curve and an expanded tobacco isothermal desorption characteristic curve; the expanded cut tobacco isothermal adsorption characteristic curve and the expanded cut tobacco isothermal desorption characteristic curve are cubic functions of the water content of the expanded cut tobacco and the relative humidity of the expanded cut tobacco, and constants of the curve are different.

Some specific embodiments are described below.

Firstly, constructing an isothermal adsorption-desorption characteristic curve and an analysis model for the finished cut tobacco of the corresponding grade, and taking the water design value of the finished cut tobacco of the grade as the balanced water content value of the cut tobacco to be controlled by the grade. Under a specific temperature condition, calculating according to the equilibrium moisture content value of the finished cut tobacco, the isothermal adsorption-desorption characteristic curve of the cut tobacco and the analysis model to obtain the corresponding relative humidity when the finished cut tobacco is kept at the equilibrium moisture content value. And taking the calculated relative humidity value as a relative humidity control index of the storage environment of the finished cut tobacco.

And secondly, taking the relative humidity control index of the storage environment of the brand finished cut tobacco as the relative humidity control index of each blended cut tobacco (cut tobacco, cut stem and expanded cut tobacco), and constructing an isothermal adsorption-desorption characteristic curve and an analysis model of each blended component cut tobacco.

And finally, obtaining the equilibrium moisture content value of each blending component under the relative humidity control index according to the calculation formula of each analysis model, and taking the equilibrium moisture content value as the moisture control index of the production process of the cut tobacco of each blending component. And the relative humidity control index is used as the relative humidity control index of each blending component tobacco shred storage area. Therefore, the moisture of the tobacco shreds with the blending components produced in each production area is prevented from migrating before and after blending.

The water content design value of a certain brand finished tobacco shred is 12%, the environmental temperature of a production area is controlled to be 26 ℃, an isothermal adsorption and desorption characteristic curve of the brand tobacco shred at 26 ℃ is detected by using an MAD800 multi-sample water adsorption and desorption instrument, and an isothermal adsorption and desorption analysis formula of the brand tobacco shred is obtained by fitting:

y1＝f(26℃,x)＝71.583x³-35.851x²+9.5799x+2.7536

y1‘＝f(26℃,x)＝84.002x³-53.72x²+18.498x+1.3707

the above formula y1 is a cut tobacco adsorption characteristic curve, and the above formula y 1' is a cut tobacco desorption characteristic curve. Wherein y1 is the tobacco shred adsorption water content, y 1' is the tobacco shred desorption water content, and x is the relative humidity of the tobacco shred. And calculating according to the two formulas to obtain the tobacco shred relative humidity which simultaneously accords with the tobacco shred adsorption characteristic curve and the tobacco shred desorption characteristic curve. And taking the relative humidity of the tobacco shreds as the target relative humidity of each component of the tobacco shreds, and calculating the target water content of each component of the tobacco shreds according to the target relative humidity. And then controlling the production process of each component of the tobacco shreds according to the target water content of each component of the tobacco shreds, so that the actual water content of each component of the tobacco shreds is equal to the calculated target water content.

Specifically, according to the two formulas, the relative humidity range of the finished cut tobacco is calculated as follows: 58 to 62 percent. And taking the relative humidity range of the finished cut tobacco as the relative humidity control index of each component of cut tobacco (cut tobacco, cut stem and expanded cut tobacco), and obtaining each isothermal adsorption-desorption characteristic curve and each analysis model according to the isothermal adsorption-desorption characteristic curve of each component of cut tobacco.

The isothermal adsorption characteristic curve formula of the leaf filaments is y2, and the isothermal desorption characteristic curve formula of the leaf filaments is y 2'. Wherein y2 and y 2' are the moisture content of the cut tobacco, and x is the relative humidity of the cut tobacco.

y2＝f(26℃,x)＝249.54x³-370.28x²+191.34x-23.987

y2‘＝f(26℃,x)＝247.26x³-366.15x²+188.87x-23.432

The formula of the isothermal adsorption characteristic curve of the cut stems is y3, and the formula of the isothermal desorption characteristic curve of the cut leaves is y 3'. Wherein y3 and y 3' are the moisture content of the cut stems, and x is the relative humidity of the cut stems.

y3＝f(26℃,x)＝269.72x³-418.21x²+223.73x-28.733

y3^′＝f(26℃,x)＝244.2x³-371.8x²+197.9x-24.321

The isothermal adsorption characteristic curve formula of the expanded cut tobacco is y4, and the isothermal desorption characteristic curve formula of the expanded cut tobacco is y 4'. Wherein y4 and y 4' are the moisture content of the expanded cut tobacco, and x is the relative humidity of the expanded cut tobacco.

y4＝f(26℃,x)＝403.21x³-569.52x²+272.37x-33.485

y4^′＝f(26℃,x)＝394.48x³-547.97x²+255.68x-29.33

And obtaining the target water content of each component through an analysis model of the cut tobacco of each component in the cut tobacco making process, wherein the target water content of the cut tobacco is 11.6%. The target moisture content of the cut stems is 12.6%. The target moisture content of the expanded tobacco was 12.3%.

In the tobacco shred making process, the target moisture content is used as a control parameter, so that the actual moisture content of the manufactured tobacco shreds is 11.6%, the actual moisture content of the cut stems is 12.6%, and the actual moisture content of the expanded tobacco shreds is 12.3%.

Then, mixing the cut tobacco leaves, the cut stems and the expanded cut tobacco according to a determined proportion to obtain finished cut tobacco.

The following table is compared, wherein table 1 shows the water content of the sample obtained by directly sampling five times without using the control method of the embodiment of the present invention. Table 2 shows the water content of the sample obtained by sampling five times after the control method of the embodiment of the present invention was used.

Table 1: water content (%)

Batches of	Leaf thread	Cut stems	Expanded tobacco shred	Finished cut tobacco
					a1	12.0	13.5	12.8	11.5
a2	12.4	12.8	12.6	12.6
					a3	12.6	12.7	12.9	12.8
a4	12.3	12.0	11.5	11.3
					a5	11.5	13.6	11.3	11.5

Table 2: water content (%)

Batches of	Leaf thread	Cut stems	Expanded tobacco shred	Finished cut tobacco
					b1	11.6	12.5	12.2	12.1
b2	11.5	12.6	12.3	12.0
					b3	11.4	12.4	12.1	11.9
b4	11.7	12.7	12.4	11.9
					b5	11.6	12.6	12.3	12.2

and a 1-a 5 times of sampling, wherein the maximum difference of the water contents of the cut tobacco leaves is 0.6, the maximum difference of the water contents of the cut stems is 1.6, the maximum difference of the water contents of the expanded cut tobacco is 1.5, and the maximum difference of the water contents of the finished cut tobacco is 1.5.

b 1-b 5 times of sampling, wherein the maximum difference of the water contents of the cut tobacco leaves is 0.3, the maximum difference of the water contents of the cut stems is 0.3, the maximum difference of the water contents of the expanded cut tobacco is 0.3, and the maximum difference of the water contents of the finished cut tobacco is 0.3.

Comparing table 1 and table 2, it can be seen that, after the control method of the embodiment of the present invention is adopted, the data difference of each sampling is small, which indicates that the moisture content of each component of the obtained tobacco shred is more uniform, and the quality of the finished cigarette is optimized and improved.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.