阅读说明：本技术 降低烟草醛类致香成分损耗的真空回潮方法 (Vacuum moisture regaining method for reducing loss of aldehyde aroma components of tobacco ) 是由 张月华 郑文超 姚倩 马波波 马一琼 李悦 王根发 孙溢明 王远卓 邱建华 王晓 于 2021-02-05 设计创作，主要内容包括：本发明公开了一种降低烟草醛类致香成分损耗的真空回潮方法,其包括：对待回潮烟叶进行水分检测；在待回潮烟叶进入回潮箱后,对所述待回潮烟叶进行真空处理；基于水分检测结果确定进行不同强度回潮箱真空度的超声雾化回潮处理,将经超声雾化后的水蒸气抽入所述回潮箱,以打破所述回潮箱的真空状态。本发明提供的降低烟草醛类致香成分损耗的真空回潮方法,采用相对较低的温度和较高的湿度进行真空回潮,在保持真空回潮作用效果的前提下适当降低真空回潮强度来使醛类物质损失降到最低,从而提高复烤片烟质量,为卷烟产品质量提升打下了良好基础。(The invention discloses a vacuum moisture regain method for reducing loss of aroma components of tobacco aldehydes, which comprises the following steps: carrying out moisture detection on tobacco leaves to be remoistened; after tobacco leaves to be dampened enter a dampening box, carrying out vacuum treatment on the tobacco leaves to be dampened; and determining to perform ultrasonic atomization moisture regain treatment of the moisture regain boxes with different strength based on the moisture detection result, and pumping the water vapor subjected to ultrasonic atomization into the moisture regain boxes so as to break the vacuum state of the moisture regain boxes. The vacuum moisture regain method for reducing the loss of the aldehyde aroma components of the tobacco adopts relatively low temperature and high humidity for vacuum moisture regain, and properly reduces the vacuum moisture regain strength on the premise of keeping the effect of vacuum moisture regain to minimize the loss of the aldehyde substances, so that the quality of redried tobacco strips is improved, and a good foundation is laid for improving the quality of cigarette products.)

1. A vacuum moisture regaining method for reducing loss of aroma components of tobacco aldehydes is characterized by comprising the following steps:

carrying out moisture detection on tobacco leaves to be remoistened;

after tobacco leaves to be dampened enter a dampening box, carrying out vacuum treatment on the tobacco leaves to be dampened;

and determining to perform ultrasonic atomization moisture regain treatment of the moisture regain boxes with different strength based on the moisture detection result, and pumping the water vapor subjected to ultrasonic atomization into the moisture regain boxes so as to break the vacuum state of the moisture regain boxes.

2. The vacuum moisture regain method for reducing the loss of the aldehyde aroma components of the tobacco according to claim 1, wherein the moisture detection of the tobacco leaves to be moisture regain specifically comprises:

and detecting the moisture in the tobacco leaves to be remoistened by utilizing a near infrared probe.

3. The vacuum moisture regain method for reducing the loss of the aroma components in the tobacco aldehydes as claimed in claim 2, wherein the vacuum treatment of the tobacco leaves to be moisture regain specifically comprises:

tightly closing a barrel door of the moisture-regaining barrel, and opening a vacuum valve to enable the moisture-regaining barrel of the moisture-regaining box to be communicated with a steam ejector;

rapidly expanding the volume of steam after passing through a nozzle of the steam ejector using steam at a pressure as a working medium, creating a supersonic steam flow at the nozzle;

and introducing the gas in the moisture regaining cylinder into a steam jet mixing chamber of the steam jet device under the injection effect of the supersonic steam flow, and forming a low-pressure vacuum state in the moisture regaining cylinder.

4. The vacuum moisture regain method for reducing the loss of the aldehyde-based flavor components of tobacco according to claim 3, wherein the low pressure vacuum state formed in the moisture regain cylinder specifically includes:

the pressure value in the moisture regaining cylinder is 0.05 standard atmospheric pressure to 0.1 standard atmospheric pressure.

5. The vacuum moisture regaining method for reducing the loss of tobacco aldehyde flavor components according to claim 3, wherein the step of pumping the ultrasonically atomized water vapor into the moisture regaining box to break the vacuum state of the moisture regaining box specifically comprises the steps of:

atomizing water into ultrafine particles with the particle size of 1-5 μm by using high-frequency oscillation of ultrasonic waves, and introducing the ultrafine particles into the wall of a vacuum box of a moisture regaining box by using negative pressure difference.

6. The vacuum moisture regain method for reducing the loss of the aldehyde-type aroma components of the tobacco according to claim 1, wherein the step of determining the ultrasonic atomization moisture regain processing for performing the vacuum degrees of the moisture regain boxes with different intensities based on the moisture detection result specifically comprises the following steps:

if the moisture detection result is more than or equal to 15%, the vacuumizing strength is 0.1 standard atmospheric pressure during ultrasonic atomization and moisture regaining treatment;

and if the moisture detection result is less than 15%, the vacuumizing strength is 0.05 standard atmospheric pressure during the ultrasonic atomization and moisture regaining treatment.

7. The vacuum moisture regain method for reducing loss of tobacco aldehyde-based aroma components according to claim 1, wherein the vacuum moisture regain method for reducing loss of tobacco aldehyde-based aroma components further comprises:

and detecting the control index of the ultrasonic atomization and moisture regaining process.

8. The vacuum moisture regain method for reducing loss of tobacco aldehyde-based aroma components according to claim 1, wherein the vacuum moisture regain method for reducing loss of tobacco aldehyde-based aroma components further comprises:

after the moisture regaining is finished, the tobacco leaves are subjected to at least two times of wetting treatment, the temperature is 25-45 ℃ in the first time of wetting treatment, the water content of the outlet material is 15.5-16.5%, and the temperature is 28-48 ℃ in the second time of wetting treatment, and the water content of the outlet material is 14-18%.

9. The vacuum moisture regain method for reducing loss of tobacco aldehyde-based aroma components according to claim 1, wherein the vacuum moisture regain method for reducing loss of tobacco aldehyde-based aroma components further comprises:

after the moisture regaining is finished, drying the tobacco leaves in a drying area of a baking machine, wherein in the drying process, the drying area at least comprises a first drying area, a second drying area, a third drying area and a fourth drying area, the temperature of the first drying area is set to be 50-54 ℃, the temperature of the second drying area is set to be 67-71 ℃, the temperature of the third drying area is set to be 62-66 ℃, and the temperature of the fourth drying area is set to be 56-60 ℃.

Technical Field

The invention relates to the technical field of threshing and redrying, in particular to a vacuum moisture regaining method for reducing loss of aroma components of tobacco aldehydes.

Background

The fragrance of the tobacco product is the comprehensive feeling of the physiological sense of human bodies to the fragrance and the taste of the tobacco, and is the special style and the special flavor of smoke. The tobacco contains a plurality of aroma components including phenols, aldehydes, ketones, lipids, terpenes, heterocycles and the like, and researches show that the aldehyde aroma components in the tobacco have beautiful aroma and have the effect of enhancing the aroma of the tobacco, such as: the sweet fragrance of cinnamaldehyde, the bread fragrance and butter fragrance of furfural, 5-methylfurfural increase the concentration of smoke, the mild nature of nicotinyl aldehyde, and the like.

Although a certain amount of green miscellaneous gas can be removed in the vacuum moisture regaining process in the next threshing and redrying process, the sheet tobacco after redrying can keep the integral uniformity of the quality of the raw materials in batches, and the storage and the preservation are facilitated. However, researches show that before and after the threshing and redrying vacuum moisture regaining process, aldehyde substances in tobacco are obviously lost and are obviously inversely related to moisture regaining temperature and humidity. With the demand of people on the original fragrance of tobacco, how to reduce the loss of aldehyde aroma substances in the threshing and redrying process becomes more important.

In the traditional vacuum moisture regaining procedure, raw tobacco is vacuumized and added with saturated high-temperature steam at 100 ℃ to form pressure difference and temperature difference, so that the moisture regaining purpose is achieved. However, in the vacuum moisture regain process, the aroma precursor is converted, and the small molecular aldehyde aroma substances generated after degradation volatilize, so that the aroma components of the processed tobacco leaves are greatly reduced, the sensory quality is obviously reduced, and the quality of the cigarette products is greatly influenced. At present, most of the improvement of the traditional vacuum moisture regaining process only emphasizes the vacuum moisture regaining effect, the efficiency and the energy-saving effect, the loss of aromatic substances of the tobacco flakes is not paid much attention, the requirement on equipment is high, and the practicability is not strong.

Disclosure of Invention

The invention aims to provide a vacuum moisture regaining method for reducing the loss of aldehyde aroma components of tobacco, which aims to solve the problems in the prior art, adopts relatively low temperature and high humidity to carry out vacuum moisture regaining, and properly reduces the vacuum moisture regaining strength to minimize the loss of the aldehyde substances on the premise of keeping the effect of vacuum moisture regaining.

The invention provides a vacuum moisture regain method for reducing loss of aroma components of tobacco aldehydes, which comprises the following steps:

carrying out moisture detection on tobacco leaves to be remoistened;

after a sample to be dampened enters a dampening box, carrying out vacuum treatment on the tobacco leaves to be dampened;

and determining to perform ultrasonic atomization moisture regain treatment of the moisture regain boxes with different strength based on the moisture detection result, and pumping the water vapor subjected to ultrasonic atomization into the moisture regain boxes so as to break the vacuum state of the moisture regain boxes.

The vacuum moisture regaining method for reducing the loss of the aroma components of the tobacco aldehydes preferably performs moisture detection on the tobacco leaves to be moisturized, and specifically comprises the following steps:

and detecting the moisture in the tobacco leaves to be remoistened by utilizing a near infrared probe.

The vacuum moisture regaining method for reducing the loss of the aldehyde aroma components of the tobacco, as described above, preferably, the vacuum treatment of the tobacco leaves to be moisture regained specifically includes:

tightly closing a barrel door of the moisture-regaining barrel, and opening a vacuum valve to enable the moisture-regaining barrel of the moisture-regaining box to be communicated with a steam ejector;

rapidly expanding the volume of steam after passing through a nozzle of the steam ejector using steam at a pressure as a working medium, creating a supersonic steam flow at the nozzle;

and introducing the gas in the moisture regaining cylinder into a steam jet mixing chamber of the steam jet device under the injection effect of the supersonic steam flow, and forming a low-pressure vacuum state in the moisture regaining cylinder.

In the vacuum moisture regaining method for reducing the loss of the tobacco aldehyde flavor components, preferably, the low-pressure vacuum state formed in the moisture regaining cylinder specifically includes:

the pressure value in the moisture regaining cylinder is 0.05 standard atmospheric pressure to 0.1 standard atmospheric pressure.

The vacuum moisture regaining method for reducing the loss of the tobacco aldehyde flavor components preferably includes the following steps of:

atomizing water into ultrafine particles with the particle size of 1-5 μm by high-frequency oscillation of ultrasonic waves, and introducing the ultrafine particles into a moisture regaining box by using negative pressure difference.

The vacuum moisture regaining method for reducing the loss of the tobacco aldehyde flavor components preferably includes the following steps of:

if the moisture detection result is more than or equal to 15%, the vacuumizing strength is 0.1 standard atmospheric pressure during ultrasonic atomization and moisture regaining treatment;

and if the moisture detection result is less than 15%, the vacuumizing strength is 0.05 standard atmospheric pressure during the ultrasonic atomization and moisture regaining treatment.

The vacuum moisture regaining method for reducing the loss of the tobacco aldehyde-type aroma components as described above, wherein preferably, the vacuum moisture regaining method for reducing the loss of the tobacco aldehyde-type aroma components further comprises:

and detecting the control index of the ultrasonic atomization and moisture regaining process.

The vacuum moisture regaining method for reducing the loss of the aroma components in the tobacco aldehydes further comprises the following steps:

after the moisture regaining is finished, the tobacco leaves are subjected to at least two times of wetting treatment, the temperature is 25-45 ℃ in the first time of wetting treatment, the water content of the outlet material is 15.5-16.5%, and the temperature is 28-48 ℃ in the second time of wetting treatment, and the water content of the outlet material is 14-18%.

The vacuum moisture regaining method for reducing the loss of the aroma components in the tobacco aldehydes further comprises the following steps:

after the moisture regaining is finished, drying the tobacco leaves in a drying area of a baking machine, wherein in the drying process, the drying area at least comprises a first drying area, a second drying area, a third drying area and a fourth drying area, the temperature of the first drying area is set to be 50-54 ℃, the temperature of the second drying area is set to be 67-71 ℃, the temperature of the third drying area is set to be 62-66 ℃, and the temperature of the fourth drying area is set to be 56-60 DEG C

The invention provides a vacuum moisture regain method for reducing loss of tobacco aldehyde aroma components, which adopts relatively low temperature and high humidity to carry out vacuum moisture regain, and properly reduces the vacuum moisture regain strength on the premise of keeping the effect of vacuum moisture regain to minimize the loss of the aldehyde substances, thereby improving the quality of redried tobacco strips and laying a good foundation for improving the quality of cigarette products.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:

fig. 1 is a flow chart of an embodiment of the vacuum moisture regaining method for reducing the loss of the tobacco aldehyde aroma components provided by the invention.

Detailed Description

In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.

Aiming at the problems that the improvement of the traditional vacuum moisture regaining process mostly only emphasizes the vacuum moisture regaining effect, the efficiency and the energy-saving effect, the loss of aromatic substances of the tobacco flakes is not paid much attention, the requirement on equipment is high, and the practicability is not strong. The invention provides a vacuum moisture regain method for reducing loss of tobacco aldehyde aroma components, which aims to improve the existing vacuum moisture regain process, adopts relatively low temperature and high humidity to carry out vacuum moisture regain, and properly reduces the vacuum moisture regain strength to minimize the loss of the aldehyde substances on the premise of keeping the effect of vacuum moisture regain, thereby improving the quality of redried tobacco strips and laying a good foundation for improving the quality of cigarette products.

As shown in fig. 1, the embodiment of the present invention provides a vacuum moisture regaining method for reducing the loss of aroma components in tobacco aldehydes, comprising the following steps:

step S1, detecting moisture of the tobacco leaves to be remoistened;

wherein, treating moisture regain tobacco leaf and carrying out moisture detection specifically includes: and detecting the moisture in the tobacco leaves to be remoistened by utilizing a near infrared probe.

Step S2, after the tobacco leaves to be dampened enter a dampening box, carrying out vacuum treatment on the tobacco leaves to be dampened;

and transferring the tobacco leaves to be dampened into a dampening box, and vacuumizing the dampening box filled with the tobacco leaves to be dampened. Specifically, the step S2 includes:

s21, tightly closing a barrel door of the moisture-regaining barrel, and opening a vacuum valve to enable the moisture-regaining barrel of the moisture-regaining box to be communicated with a steam ejector;

step S22, using steam with a certain pressure as a working medium, rapidly expanding the volume of the steam after passing through a nozzle of the steam ejector, and generating a supersonic steam flow at the nozzle;

and step S23, introducing the gas in the moisture regaining cylinder into a steam injection mixing chamber of the steam injector under the injection effect of the supersonic steam flow, and forming a low-pressure vacuum state in the moisture regaining cylinder.

Wherein, the low-pressure vacuum state formed in the moisture regaining cylinder specifically refers to: the pressure value in the moisture regaining cylinder is 0.05 standard atmospheric pressure to 0.1 standard atmospheric pressure.

And step S3, determining to perform ultrasonic atomization moisture regain processing of moisture regain boxes with different strength based on moisture detection results, and pumping the water vapor subjected to ultrasonic atomization into the moisture regain boxes so as to break the vacuum state of the moisture regain boxes.

The invention adopts relatively low temperature and high humidity for vacuum moisture regain, utilizes the principle of ultrasonic high-frequency oscillation to atomize water into ultramicron, and takes water into a moisture regain box through a pneumatic device, and the water absorbs heat in the moisture regain box to play a certain role in reducing temperature. Atomizing water into ultrafine particles of 1-5 μm by ultrasonic high-frequency oscillation, and introducing into the wall of the vacuum tank by negative pressure difference.

The pumping of the water vapor subjected to ultrasonic atomization into the moisture regain box to break the vacuum state of the moisture regain box specifically comprises:

atomizing water into ultrafine particles with the particle size of 1-5 μm by using high-frequency oscillation of ultrasonic waves, and introducing the ultrafine particles into the wall of a vacuum box of a moisture regaining box by using negative pressure difference.

It should be noted that the time of the ultrasonic atomization moisture regain treatment is not limited specifically, and the vacuum moisture regain time can be prolonged or reduced properly for tobacco leaves in different production places, so that the original tobacco can absorb moisture sufficiently, the loss of aldehyde aroma components in the tobacco leaves is reduced effectively while the process requirements of the threshing process are met, and the quality and the industrial availability of finished tobacco sheets are further improved.

Wherein, the ultrasonic atomization dampening treatment for determining the vacuum degrees of the dampening tanks with different strengths based on the moisture detection result specifically comprises the following steps:

if the moisture detection result is more than or equal to 15%, the vacuumizing strength is 0.1 standard atmospheric pressure during ultrasonic atomization and moisture regaining treatment;

namely, under the condition that the moisture detection result is more than or equal to 15 percent, the ultrasonic atomization moisture regain treatment is carried out, wherein the pressure value in the moisture regain box is 0.1 standard atmospheric pressure.

And if the moisture detection result is less than 15%, the vacuumizing strength is 0.05 standard atmospheric pressure during the ultrasonic atomization and moisture regaining treatment.

Namely, under the condition that the moisture detection result is less than 15%, ultrasonic atomization moisture regain processing is carried out, wherein the pressure value in the moisture regain box is 0.05 standard atmospheric pressure.

Further, the vacuum moisture regaining method for reducing the loss of the tobacco aldehyde aroma components further comprises the following steps:

and step S4, detecting the control index of the ultrasonic atomization and moisture regaining process.

Exemplary control indicators that need to be detected are: the vacuum degree of the dampening tank, the temperature of the tobacco core, the moisture of the tobacco, the permeability and the like. The general criteria are: the vacuum degree is 0.15 standard atmospheric pressure, the water content of the tobacco leaves is 17 +/-1%, the core-spun temperature is about 60 ℃, and the permeability is more than or equal to 98%. The tobacco leaves with important indexes (such as tobacco leaf moisture, permeability and the like) need to be remoistened again, the tobacco leaves with the tobacco leaf moisture of less than 16% and the permeability of less than 98% need to be remoistened again, and the tobacco leaf raw materials can be subjected to the next procedure until the moisture content of the tobacco leaves is 17% +/-1% and the permeability of more than or equal to 98%.

Further, the vacuum moisture regaining method for reducing the loss of the tobacco aldehyde aroma components further comprises the following steps:

and step S5, after the moisture regain is finished, carrying out at least two times of wetting treatment on the tobacco leaves, wherein in the first time of wetting treatment, the temperature is 25-45 ℃, the water content of the outlet material is 15.5-16.5%, in the second time of wetting treatment, the temperature is 28-48 ℃, and the water content of the outlet material is 14-18%. The loss of aldehyde aroma components in the tobacco leaves can be further reduced by adjusting the leaf moistening temperature.

Further, the vacuum moisture regaining method for reducing the loss of the tobacco aldehyde aroma components further comprises the following steps:

and step S6, after the moisture regain is finished, drying the tobacco leaves in a drying area of a baking machine, wherein in the drying process, the drying area at least comprises a first drying area, a second drying area, a third drying area and a fourth drying area, the temperature of the first drying area is set to be 50-54 ℃, the temperature of the second drying area is set to be 67-71 ℃, the temperature of the third drying area is set to be 62-66 ℃, and the temperature of the fourth drying area is set to be 56-60 ℃. By optimizing the drying process parameters, the loss of aldehyde aroma components in the tobacco leaves can be further reduced.

Further, after the drying is finished, cooling the tobacco leaves in a cooling area, wherein the temperature of the cooling area is not more than 35 ℃. By optimizing the cooling process parameters, the loss of aldehyde aroma components in the tobacco leaves can be further reduced.

Further, after the cooling is finished, the tobacco leaves are subjected to moisture regaining treatment in a moisture regaining area, and the temperature of the moisture regaining area is not more than 55 ℃. By optimizing the moisture regain process parameters, the loss of aldehyde aroma components in the tobacco leaves can be further reduced.

In one embodiment, a tobacco leaf sample before feeding is used as a blank sample, a tobacco leaf sample produced according to the original threshing and redrying process parameters is used as a control sample, and a tobacco leaf sample produced by adopting a low-temperature high-humidity vacuum moisture-regaining treatment process on 2019 Anschhang Chang tobacco leaves in Henan of China is used as an optimized sample, and the method specifically comprises the following steps:

(1) detecting tobacco leaves to be remoistened in the Wenchang province, wherein the moisture content is 13.75 percent and is lower than 15 percent, and the detection is carried out according to the ultrasonic atomization remoistening operation procedure of which the pressure value in a remoistening box is 0.05 standard atmospheric pressure;

(2) keeping the steam valve open, atomizing water by utilizing ultrasonic high-frequency oscillation, and injecting the atomized water into a vacuum box;

(3) after moisture regain and detection, the related technical parameters are as follows: vacuum degree: 0.05 standard atmosphere; the quality indexes are as follows: moisture content of tobacco leaves: 18 percent; temperature of core-spun: 50 ℃; the back transmittance is as follows: 99 percent; the quality index detection standard is met, and the next procedure can be carried out.

The content of aldehyde aroma components of the sample is shown in Table 1 through detection

TABLE 1

	Aldehyde fragrant substance (ug/g)
		Blank sample	30.81
Control sample 1	26.07
		Control sample 2	25.90
Control sample 3	26.15
		Optimization of sample 1	27.91
Optimization of sample 2	28.17
		Optimization of sample 3	28.05

In another embodiment, a tobacco leaf sample before feeding is used as a blank sample, a tobacco leaf sample produced according to the original threshing and redrying process parameters is used as a reference sample, a tobacco leaf sample produced by adopting a low-temperature high-humidity vacuum moisture-regaining treatment procedure on 2019 Fujian Sanming tobacco leaves is used as an optimized sample, and the method specifically comprises the following steps:

(1) detecting Fujian Sanming tobacco leaves to be remoistened by using a near-infrared probe, wherein the moisture content is 16.24 percent and is higher than 15 percent, and the detection is carried out according to an ultrasonic atomization remoistening operation procedure of which the pressure value in a remoistening box is 0.1 standard atmospheric pressure;

(2) in the vacuum moisture regaining process, the steam valve is kept open, water is atomized by utilizing ultrasonic high-frequency oscillation and is injected into a vacuum box;

(3) after one-time moisture regain and detection, the related technical parameters are as follows: vacuum degree: 0.1 standard atmosphere; the relevant quality indexes are as follows: moisture content of tobacco leaves: 17.8 percent; temperature of core-spun: 50 ℃; the back transmittance is as follows: 99 percent; the quality index detection standard is met, and the next procedure can be carried out.

The content of aldehyde aroma components of the sample is shown in Table 2

TABLE 2

As can be seen from tables 1 and 2, compared with the blank samples, the reduction values of the four typical aldehyde aroma components obtained by the low-temperature high-humidity vacuum moisture regain processing procedure of the invention are obviously smaller than those of the traditional vacuum moisture regain processing procedure, which shows that the loss of the aldehyde aroma components in the tobacco leaf raw materials can be obviously reduced by the low-temperature high-humidity vacuum moisture regain processing procedure of the invention, thereby improving the quality and the industrial availability of finished tobacco sheets.

The vacuum moisture regain method for reducing the loss of the aldehyde aroma components of the tobacco provided by the embodiment of the invention adopts relatively low temperature and high humidity for vacuum moisture regain, and properly reduces the vacuum moisture regain strength on the premise of keeping the effect of vacuum moisture regain to minimize the loss of the aldehyde substances, thereby improving the quality of redried tobacco strips and laying a good foundation for improving the quality of cigarette products.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.