阅读说明：本技术 一种基于温湿度一体检测的烟叶烘烤方法 (Tobacco leaf baking method based on temperature and humidity integrated detection ) 是由 王涛 毛岚 宴飞 高华锋 李生栋 唐荣禄 张豹林 张军刚 赵虎 解燕 杨树虹 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种基于温湿度一体检测的烟叶烘烤方法,烘烤包括以下步骤:A前处理：采收正常成熟的烟叶,按照8～10kg/竿分类编竿,装烟时按照10～12cm/竿分类装烟；B烘烤：装烟后进入到烘烤房内,烟叶烘烤时,烘烤房内的循环风机工作,温湿度一体传感器连接的探头进行温度和湿度的监测；烘烤过程经过变黄期、定色期和干筋期；变黄期是烟叶颜色由绿变黄的阶段,包括变黄前期、变黄中期和变黄后期；定色期是烟叶颜色和内在品质固定的阶段,包括定色前期和定色后期。通过烘烤房内进行温湿度的监控,便于烟叶的制备。(The invention discloses a tobacco leaf baking method based on temperature and humidity integrated detection, which comprises the following steps: collecting normal mature tobacco leaves, sorting and weaving rods according to 8-10 kg/rod, and sorting and loading the tobacco leaves according to 10-12 cm/rod during tobacco loading; b, baking: the tobacco leaves are put into a baking room after being filled with the tobacco, when the tobacco leaves are baked, a circulating fan in the baking room works, and a probe connected with a temperature and humidity integrated sensor monitors the temperature and the humidity; the baking process passes through a yellowing period, a color fixing period and a tendon drying period; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a period of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early period and a fixing later period. The temperature and the humidity are monitored in the baking room, so that the tobacco leaves are conveniently prepared.)

1. A tobacco leaf baking method based on temperature and humidity integrated detection is characterized by comprising the following steps:

a, pretreatment: collecting normal mature tobacco leaves, sorting and weaving rods according to 8-10 kg/rod, and sorting and loading the tobacco leaves according to 10-12 cm/rod during tobacco loading;

b, baking: the tobacco leaves are put into a baking room after being filled with the tobacco, when the tobacco leaves are baked, a circulating fan in the baking room works, and a probe connected with a temperature and humidity integrated sensor monitors the temperature and the humidity; the baking process passes through a yellowing period, a color fixing period and a tendon drying period; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a period of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early period and a fixing later period.

2. The tobacco leaf baking method based on temperature and humidity integrated detection according to claim 1, characterized in that: in the step B:

in the early stage of yellowing: the temperature of the dry ball is increased to 35 ℃ at the temperature increasing speed of 1 h/DEG C;

in the middle stage of yellowing: the temperature of the dry ball is increased to 38 ℃ at the temperature increasing speed of 1 h/DEG C;

in the later yellowing stage: the temperature of the dry ball is raised to 40 ℃ at the temperature raising speed of 2 h/DEG C for baking, and then the temperature is raised to 42 ℃ at the temperature raising speed of 2 h/DEG C;

in the earlier stage of color fixing: raising the temperature of the dry bulb to 45 ℃ at a temperature raising speed of 2 h/DEG C, baking, and raising the temperature of the dry bulb to 48 ℃ at a temperature raising speed of 2-3 h/DEG C;

at the later stage of color fixing: the temperature of the dry ball is increased to 54 ℃ at the temperature increasing speed of 2 h/DEG C;

and (3) a tendon drying period: heating the dry ball to 60 ℃ at a heating rate of 1 h/DEG C and baking; the temperature was then raised to 67 ℃ at a rate of 1 h/DEG C.

3. The tobacco leaf baking method based on temperature and humidity integrated detection according to claim 1, characterized in that: the baking room comprises a descending baking room ceiling and an ascending baking room bottom ceiling, a digital temperature and humidity integrated sensor is respectively connected with an upper ceiling and a lower ceiling probe, the upper ceiling probe is installed at the position, 1m away from the side wall, of the baking room ceiling and 10-15cm higher than the blade tip, and the lower ceiling probe is installed at the position, 1m away from the side wall, of the bottom ceiling and 10-15cm higher than the blade tip.

4. The tobacco leaf baking method based on temperature and humidity integrated detection according to claim 2, characterized in that: the relative humidity in the baking room at the early stage of yellowing in the yellowing stage is 90-96%, the temperature is stabilized to a high-temperature area, the leaf apex becomes yellow, and the yellowing length of the leaf apex is 4-6 cm;

the relative humidity in the baking room in the middle yellowing stage is stabilized to 85-90%, the mesophyll at the base part of the tobacco leaves is basically full yellow, the leaves 7-8 become yellow, the branch veins at the leaf tips become white, the leaves are soft, and the water loss rate of the tobacco leaves is 16-22%;

in a baking room at the later yellowing stage, the temperature of a dry bulb is increased to 40 ℃ at the temperature increasing speed of 2 h/DEG C, the relative humidity is 70-75%, and the temperature-stabilizing baking time is 8 h; and raising the temperature to 42 ℃ at a temperature raising speed of 2 h/DEG C, wherein the relative humidity is 65-70%, the leaf base branches are basically all yellow at a stable temperature and high temperature region, the leaf tips are hooked and curled, and the water loss rate of the tobacco leaves is 36-42%.

5. The tobacco leaf baking method based on temperature and humidity integrated detection according to claim 2, characterized in that: in the earlier stage of color fixing: the relative humidity in the baking room is 60-65%, and the temperature-stabilizing baking time is 8 hours; then, the temperature of the dry bulb is increased to 48 ℃ at the temperature rising speed of 2-3 h/DEG C, the relative humidity is 50-55%, the main veins of the tobacco leaves in the stable-temperature and high-temperature region are faded and whitened, the leaves are wound into small rolls, and the water loss rate of the tobacco leaves is 42-58%; the branch vein at the base part of the tobacco leaf in the low-temperature area is completely white, the tip of the leaf is hooked and curled, and the water loss rate is 36-42%; the relative humidity in the baking room at the later stage of color fixing is 35-40%, the temperature is stabilized at 54 ℃ until the leaves of the whole furnace are completely dried and wound into a large reel, and the water loss rate of the tobacco leaves is 72-78%.

6. The tobacco leaf baking method based on temperature and humidity integrated detection according to claim 2, characterized in that: the relative humidity in the baking room in the gluten drying period is 35%, and the temperature-stabilizing baking time is 10 hours; and then the temperature is raised to 67 ℃ at the temperature raising speed of 1 h/DEG C, the relative humidity is 15 percent, and the temperature is stabilized until the main vein of the whole-furnace tobacco leaves is dried, and the water loss rate is 93-96 percent.

Technical Field

The invention relates to the technical field of tobacco leaf baking, in particular to a tobacco leaf baking method based on temperature and humidity integrated detection.

Background

The baking is an important link in the tobacco production process and is also one of the bottlenecks in the production development of the flue-cured tobacco and the improvement of the quality of the tobacco. The bulk curing barn is a main primary processing facility for curing the tobacco leaves at present, wherein the temperature and humidity control equipment of the bulk curing barn is a command center for curing operation. The temperature and humidity are monitored, and the circulating fan, the combustion fan and the air inlet or moisture exhaust device are controlled to execute and complete required operations through program operation and comparison, so that automatic baking control is realized. The collection of the temperature and the humidity in the curing barn is just as important as eyes, and the operation of an actuator of the temperature and humidity control equipment of the curing barn in the next step is determined.

Therefore, the tobacco leaf baking method based on the temperature and humidity integrated detection is provided, and the tobacco leaves can be conveniently baked.

Disclosure of Invention

The invention aims to provide a tobacco leaf baking method based on temperature and humidity integrated detection, which solves the problem of large baking loss caused by inaccurate wet bulb temperature detection due to equipment abnormity of a wet bulb temperature sensor by controlling relative humidity.

The invention adopts the following technical scheme:

a tobacco leaf baking method based on temperature and humidity integrated detection comprises the following steps:

a, pretreatment: collecting normal mature tobacco leaves, sorting and weaving rods according to 8-10 kg/rod, and sorting and loading the tobacco leaves according to 10-12 cm/rod during tobacco loading;

b, baking: the tobacco leaves are put into a baking room after being filled with the tobacco, when the tobacco leaves are baked, a circulating fan in the baking room works, and a probe connected with a temperature and humidity integrated sensor monitors the temperature and the humidity; the baking process passes through a yellowing period, a color fixing period and a tendon drying period; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a period of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early period and a fixing later period.

Further, the method comprises the following steps of; in the step B:

in the early stage of yellowing: the temperature of the dry ball is increased to 35 ℃ at the temperature increasing speed of 1 h/DEG C;

in the middle stage of yellowing: the temperature of the dry ball is increased to 38 ℃ at the temperature increasing speed of 1 h/DEG C;

in the later yellowing stage: the temperature of the dry ball is raised to 40 ℃ at the temperature raising speed of 2 h/DEG C for baking, and then the temperature is raised to 42 ℃ at the temperature raising speed of 2 h/DEG C;

in the earlier stage of color fixing: raising the temperature of the dry bulb to 45 ℃ at a temperature raising speed of 2 h/DEG C, baking, and raising the temperature of the dry bulb to 48 ℃ at a temperature raising speed of 2-3 h/DEG C;

at the later stage of color fixing: the temperature of the dry ball is increased to 54 ℃ at the temperature increasing speed of 2 h/DEG C;

and (3) a tendon drying period: heating the dry ball to 60 ℃ at a heating rate of 1 h/DEG C and baking; the temperature was then raised to 67 ℃ at a rate of 1 h/DEG C.

Further, the method comprises the following steps of; the baking room comprises a descending baking room ceiling and an ascending baking room bottom ceiling, a digital temperature and humidity integrated sensor is respectively connected with an upper ceiling and a lower ceiling probe, the upper ceiling probe is installed at the position, 1m away from the side wall, of the baking room ceiling and 10-15cm higher than the blade tip, and the lower ceiling probe is installed at the position, 1m away from the side wall, of the bottom ceiling and 10-15cm higher than the blade tip.

Further, the method comprises the following steps of; the relative humidity in the baking room at the early stage of yellowing in the yellowing stage is 90-96%, the temperature is stabilized to a high-temperature area, the leaf apex becomes yellow, and the yellowing length of the leaf apex is 4-6 cm;

the relative humidity in the baking room in the middle yellowing stage is stabilized to 85-90%, the mesophyll at the base part of the tobacco leaves is basically full yellow, the leaves 7-8 become yellow, the branch veins at the leaf tips become white, the leaves are soft, and the water loss rate of the tobacco leaves is 16-22%;

in a baking room at the later yellowing stage, the temperature of a dry bulb is increased to 40 ℃ at the temperature increasing speed of 2 h/DEG C, the relative humidity is 70-75%, and the temperature-stabilizing baking time is 8 h; and raising the temperature to 42 ℃ at a temperature raising speed of 2 h/DEG C, wherein the relative humidity is 65-70%, the leaf base branches are basically all yellow at a stable temperature and high temperature region, the leaf tips are hooked and curled, and the water loss rate of the tobacco leaves is 36-42%.

Further, the method comprises the following steps of; in the earlier stage of color fixing: the relative humidity in the baking room is 60-65%, and the temperature-stabilizing baking time is 8 hours; then, the temperature of the dry bulb is increased to 48 ℃ at the temperature rising speed of 2-3 h/DEG C, the relative humidity is 50-55%, the main veins of the tobacco leaves in the stable-temperature and high-temperature region are faded and whitened, the leaves are wound into small rolls, and the water loss rate of the tobacco leaves is 42-58%; the branch vein at the base part of the tobacco leaf in the low-temperature area is completely white, the tip of the leaf is hooked and curled, and the water loss rate is 36-42%;

the relative humidity in the baking room at the later stage of color fixing is 35-40%, the temperature is stabilized at 54 ℃ until the leaves of the whole furnace are completely dried and wound into a large reel, and the water loss rate of the tobacco leaves is 72-78%.

Further, the method comprises the following steps of; the relative humidity in the baking room in the gluten drying period is 35%, and the temperature-stabilizing baking time is 10 hours; and then the temperature is raised to 67 ℃ at the temperature raising speed of 1 h/DEG C, the relative humidity is 15 percent, and the temperature is stabilized until the main vein of the whole-furnace tobacco leaves is dried, and the water loss rate is 93-96 percent.

Compared with the prior art, the invention has at least one of the following beneficial effects:

1. carry out the tobacco leaf and toast in the tobacco leaf bakery, carry out the monitoring of temperature and humidity, temperature and humidity control also does benefit to the regulation and control of bakery temperature baking temperature.

2. In the tobacco leaf baking process, the baking process passes through a yellowing period, a color fixing period and a stem drying period. The yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a period of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early period and a fixing later period. Is convenient for adjusting the quality of the prepared tea.

3. Adopt this application with the control of bakery and humiture, the tobacco leaf of preparation is mainly middle-grade and high-grade tobacco leaf.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

a tobacco leaf baking method based on temperature and humidity integrated detection comprises the following steps:

a, pretreatment: collecting normal mature tobacco leaves, sorting and weaving rods according to 8 kg/rod, and sorting and loading the tobacco leaves according to 10 cm/rod during tobacco loading;

b, baking: the tobacco enters a baking room after being dried, when the tobacco leaves are baked, a circulating fan in the baking room works, and a probe connected with a temperature and humidity integrated sensor monitors the temperature and the humidity; the baking process passes through a yellowing period, a color fixing period and a tendon drying period; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a stage of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early stage and a fixing later stage; when the tobacco leaves are baked, the probe connected with the temperature and humidity integrated sensor monitors the temperature and the humidity, so that the tobacco leaves are conveniently baked, and the conditions of the tobacco leaves in the yellowing period, the color fixing period and the stem drying period are conveniently controlled according to the control of the temperature and the humidity, so that the prepared tobacco leaves can be prepared to medium-grade tobacco leaves.

Example 2:

on the basis of example 1, the baking comprises the following steps:

a, pretreatment: collecting normal mature tobacco leaves, sorting and weaving rods according to 10 kg/rod, and sorting and loading the tobacco leaves according to 12 cm/rod during tobacco loading;

b, baking: the tobacco leaves are put into a baking room after being filled with the tobacco, when the tobacco leaves are baked, a circulating fan in the baking room works, and a probe connected with a temperature and humidity integrated sensor monitors the temperature and the humidity; the baking process passes through a yellowing period, a color fixing period and a tendon drying period; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a stage of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early stage and a fixing later stage; when the tobacco leaves are baked, the probe connected with the temperature and humidity integrated sensor monitors the temperature and the humidity, so that the tobacco leaves are conveniently baked, and the conditions of the tobacco leaves in the yellowing period, the color fixing period and the stem drying period are conveniently controlled according to the control of the temperature and the humidity, so that the prepared tobacco leaves can be prepared to medium-grade tobacco leaves.

Example 3:

on the basis of examples 1-2, the baking comprises the following steps:

a, pretreatment: collecting normal mature tobacco leaves, sorting and weaving rods according to 9 kg/rod, and sorting and loading the tobacco leaves according to 11 cm/rod during tobacco loading;

b, baking: the tobacco leaves are put into a baking room after being filled with the tobacco, when the tobacco leaves are baked, a circulating fan in the baking room works, and a probe connected with a temperature and humidity integrated sensor monitors the temperature and the humidity; the baking process passes through a yellowing period, a color fixing period and a tendon drying period; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the fixing period is a stage of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early stage and a fixing later stage; when the tobacco leaves are baked, the probe connected with the temperature and humidity integrated sensor monitors the temperature and the humidity, so that the tobacco leaves are conveniently baked, and the conditions of the tobacco leaves in the yellowing period, the color fixing period and the stem drying period are conveniently controlled according to the control of the temperature and the humidity, so that the prepared tobacco leaves can be prepared to medium-grade tobacco leaves.

Example 4:

on the basis of examples 1 to 3, in step B:

in the early stage of yellowing: the temperature of the dry ball is increased to 35 ℃ at the temperature increasing speed of 1 h/DEG C;

in the middle stage of yellowing: the temperature of the dry ball is increased to 38 ℃ at the temperature increasing speed of 1 h/DEG C;

in the later yellowing stage: the temperature of the dry ball is raised to 40 ℃ at the temperature raising speed of 2 h/DEG C for baking, and then the temperature is raised to 42 ℃ at the temperature raising speed of 2 h/DEG C;

in the earlier stage of color fixing: the temperature of the dry bulb is raised to 45 ℃ for baking at the temperature raising speed of 2 h/DEG C, and then the temperature of the dry bulb is raised to 48 ℃ at the temperature raising speed of 2 h/DEG C;

at the later stage of color fixing: the temperature of the dry ball is increased to 54 ℃ at the temperature increasing speed of 2 h/DEG C;

and (3) a tendon drying period: heating the dry ball to 60 ℃ at a heating rate of 1 h/DEG C and baking; then the temperature is increased to 67 ℃ at the temperature increasing speed of 1 h/DEG C; the tea leaves are baked through a yellow period, a color fixing period and a stem drying period, wherein the yellow period is a period of changing the color of the tobacco leaves from green to yellow, and comprises a yellow earlier period, a yellow middle period and a yellow later period; the color fixing period is a period in which the color and the internal quality of the tobacco leaves are fixed, and comprises a color fixing early period and a color fixing later period, the temperature of each period is different according to the monitoring of the temperature and the humidity, the temperature rising speed is different, the baking is convenient, the color of the tobacco leaves is changed, the color fixing is realized, and the requirements are met.

Example 5:

on the basis of examples 1 to 4, in step B:

in the early stage of yellowing: the temperature of the dry ball is increased to 35 ℃ at the temperature increasing speed of 1 h/DEG C;

in the middle stage of yellowing: the temperature of the dry ball is increased to 38 ℃ at the temperature increasing speed of 1 h/DEG C;

in the later yellowing stage: the temperature of the dry ball is raised to 40 ℃ at the temperature raising speed of 2 h/DEG C for baking, and then the temperature is raised to 42 ℃ at the temperature raising speed of 2 h/DEG C;

in the earlier stage of color fixing: the temperature of the dry bulb is raised to 45 ℃ for baking at the temperature raising speed of 2 h/DEG C, and then the temperature of the dry bulb is raised to 48 ℃ at the temperature raising speed of 3 h/DEG C;

at the later stage of color fixing: the temperature of the dry ball is increased to 54 ℃ at the temperature increasing speed of 2 h/DEG C;

and (3) a tendon drying period: heating the dry ball to 60 ℃ at a heating rate of 1 h/DEG C and baking; then the temperature is increased to 67 ℃ at the temperature increasing speed of 1 h/DEG C; the tea leaves are baked through a yellow period, a color fixing period and a stem drying period, wherein the yellow period is a period of changing the color of the tobacco leaves from green to yellow, and comprises a yellow earlier period, a yellow middle period and a yellow later period; the color fixing period is a period in which the color and the internal quality of the tobacco leaves are fixed, and comprises a color fixing early period and a color fixing later period, the temperature of each period is different according to the monitoring of the temperature and the humidity, the temperature rising speed is different, the baking is convenient, the color of the tobacco leaves is changed, the color fixing is realized, and the requirements are met.

Example 6:

on the basis of examples 1 to 5, in step B:

in the early stage of yellowing: the temperature of the dry ball is increased to 35 ℃ at the temperature increasing speed of 1 h/DEG C;

in the middle stage of yellowing: the temperature of the dry ball is increased to 38 ℃ at the temperature increasing speed of 1 h/DEG C;

in the later yellowing stage: the temperature of the dry ball is raised to 40 ℃ at the temperature raising speed of 2 h/DEG C for baking, and then the temperature is raised to 42 ℃ at the temperature raising speed of 2 h/DEG C;

in the earlier stage of color fixing: the temperature of the dry bulb is raised to 45 ℃ for baking at the temperature raising speed of 2 h/DEG C, and then the temperature of the dry bulb is raised to 48 ℃ at the temperature raising speed of 2.5 h/DEG C;

at the later stage of color fixing: the temperature of the dry ball is increased to 54 ℃ at the temperature increasing speed of 2 h/DEG C;

and (3) a tendon drying period: heating the dry ball to 60 ℃ at a heating rate of 1 h/DEG C and baking; then the temperature is increased to 67 ℃ at the temperature increasing speed of 1 h/DEG C; the tea leaves are baked through a yellow period, a color fixing period and a stem drying period, wherein the yellow period is a period of changing the color of the tobacco leaves from green to yellow, and comprises a yellow earlier period, a yellow middle period and a yellow later period; the color fixing period is a period in which the color and the internal quality of the tobacco leaves are fixed, and comprises a color fixing early period and a color fixing later period, the temperature of each period is different according to the monitoring of the temperature and the humidity, the temperature rising speed is different, the baking is convenient, the color of the tobacco leaves is changed, the color fixing is realized, and the requirements are met.

Example 7:

on the basis of the embodiment 1-6, the baking room comprises a descending baking room ceiling and an ascending baking room bottom shed, a digital temperature and humidity integrated sensor is respectively connected with an upper shed and a lower shed, the upper shed probe is installed at the position, 1m away from the side wall, of the baking room ceiling and 10cm higher than the leaf tip, and the lower shed probe is installed at the position, 1m away from the side wall, of the bottom shed and 10cm higher than the leaf tip; is convenient for temperature and humidity monitoring and tobacco leaf baking.

Example 8:

on the basis of the embodiment 1-7, the baking room comprises a descending baking room ceiling and an ascending baking room bottom ceiling, a digital temperature and humidity integrated sensor is respectively connected with an upper ceiling and a lower ceiling, the upper ceiling probe is installed at the position, 1m away from the side wall, of the baking room ceiling and 15cm higher than the blade tip, and the lower ceiling probe is installed at the position, 1m away from the side wall, of the bottom ceiling and 15cm higher than the blade tip; is convenient for temperature and humidity monitoring and tobacco leaf baking.

Example 9:

on the basis of the embodiment 1-8, the baking room comprises a descending baking room ceiling and an ascending baking room bottom ceiling, a digital temperature and humidity integrated sensor is respectively connected with two probes of an upper ceiling and a lower ceiling, the upper ceiling probe is installed at the position, 1m away from the side wall, of the baking room ceiling and is 12cm higher than the leaf tip, and the lower ceiling probe is installed at the position, 1m away from the side wall, of the bottom ceiling and is 12cm higher than the leaf tip; is convenient for temperature and humidity monitoring and tobacco leaf baking.

Example 10:

on the basis of the embodiments 1 to 9, the relative humidity in the baking room at the early stage of yellowing in the yellowing stage is 90 percent, the temperature is stable, the leaf apex of a high-temperature area becomes yellow, and the length of the leaf apex becoming yellow is 4 cm;

the relative humidity in the baking room in the middle stage of yellowing is stabilized to 85%, the mesophyll at the base part of the tobacco leaves is basically full yellow, the leaves 78 are yellow, the branch veins at the leaf tips become white, the leaves are soft, and the water loss rate of the tobacco leaves is 16%;

in a baking room at the later yellowing stage, the temperature of the dry balls is increased to 40 ℃ at the temperature increasing speed of 2 h/DEG C, the relative humidity is 70%, and the temperature-stabilizing baking time is 8 h; then, the temperature is increased to 42 ℃ at the temperature rising speed of 2 h/DEG C, the relative humidity is 65 percent, the branch vein at the base part of the leaf in the stable-temperature and high-temperature region is basically yellow, the tip of the leaf is hooked and curled, and the water loss rate of the tobacco leaf is 36 percent; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the control of temperature and humidity in the bakery in the earlier stage of becoming yellow, the color of the tobacco leaf of temperature and humidity, the gauze mask of the tobacco leaf condition are carried out in every stage of being convenient for, the control of tobacco leaf water loss rate, the tobacco leaf quality of being convenient for to toast satisfies the needs.

Example 11:

on the basis of the embodiments 1 to 10, the relative humidity in the baking room at the early stage of yellowing in the yellowing stage is 96 percent, the leaf apex of the temperature stabilizing high-temperature area becomes yellow, and the length of the leaf apex becoming yellow is 6 cm;

the relative humidity in the baking room in the middle stage of yellowing is stabilized to 90%, the mesophyll at the base part of the tobacco leaves is basically full yellow, the leaves 8 become yellow, the branch veins at the leaf tips become white, the leaves are soft, and the water loss rate of the tobacco leaves is 22%;

in a baking room at the later yellowing stage, the temperature of the dry bulb is increased to 40 ℃ at the temperature increasing speed of 2 h/DEG C, the relative humidity is 75%, and the temperature-stabilizing baking time is 8 h; then, the temperature is increased to 42 ℃ at the temperature rising speed of 2 h/DEG C, the relative humidity is 70 percent, the branch vein at the base part of the leaf in the stable-temperature and high-temperature region is basically yellow, the tip of the leaf is hooked and curled, and the water loss rate of the tobacco leaf is 42 percent; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the control of temperature and humidity in the bakery in the earlier stage of becoming yellow, the color of the tobacco leaf of temperature and humidity, the gauze mask of the tobacco leaf condition are carried out in every stage of being convenient for, the control of tobacco leaf water loss rate, the tobacco leaf quality of being convenient for to toast satisfies the needs.

Example 12:

on the basis of the embodiments 1 to 11, the relative humidity in the baking room at the early stage of yellowing in the yellowing stage is 92 percent, the leaf apex of the temperature stabilizing high-temperature area becomes yellow, and the length of the leaf apex becoming yellow is 5 cm;

the relative humidity in the baking room in the middle stage of yellowing is stabilized to 858 percent, the mesophyll at the base part of the tobacco leaves is basically full yellow, the leaves 7 become yellow, the branch veins of the leaf tips become white, the leaves are soft, and the water loss rate of the tobacco leaves is 20 percent;

in a baking room at the later yellowing stage, the temperature of the dry bulb is increased to 40 ℃ at the temperature increasing speed of 2 h/DEG C, the relative humidity is 72%, and the temperature-stabilizing baking time is 8 h; then, the temperature is increased to 42 ℃ at the temperature rising speed of 2 h/DEG C, the relative humidity is 68 percent, the branch vein of the leaf base part at the stable temperature and high temperature region is basically full yellow, the leaf tip is hooked and curled, and the water loss rate of the tobacco leaf is 40 percent; the yellowing stage is the stage of changing the color of the tobacco leaves from green to yellow, and comprises the early yellowing stage, the middle yellowing stage and the later yellowing stage; the control of temperature and humidity in the bakery in the earlier stage of becoming yellow, the color of the tobacco leaf of temperature and humidity, the gauze mask of the tobacco leaf condition are carried out in every stage of being convenient for, the control of tobacco leaf water loss rate, the tobacco leaf quality of being convenient for to toast satisfies the needs.

Example 13:

on the basis of examples 1 to 12, at the earlier stage of fixing: the relative humidity in the baking room is 60 percent, and the temperature-stabilizing baking time is 8 hours; then the temperature of the dry bulb is raised to 48 ℃ at the temperature raising speed of 2 h/DEG C, the relative humidity is 50 percent, the main veins of the tobacco leaves in the stable-temperature and high-temperature areas are faded and whitened, the leaves are wound into small rolls, and the water loss rate of the tobacco leaves is 42 percent; the branch vein at the base part of the tobacco leaf in the low-temperature area is completely white, the leaf is hooked and curled, and the water loss rate is 36%;

the relative humidity in the baking room at the later stage of color fixing is 35%, the temperature is stabilized at 54 ℃ until the leaves of the whole oven are completely dry and the leaves of the big reel are completely dry, and the water loss rate of the tobacco leaves is 72%; the fixing period is a stage of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early stage and a fixing later stage; and during color fixing, the temperature, the humidity, the tobacco condition and the water loss rate of the tobacco are controlled, so that the tobacco prepared from the tobacco is good in quality and meets the requirements.

Example 14:

on the basis of examples 1 to 13, at the earlier stage of fixing: the relative humidity in the baking room is 65%, and the temperature-stabilizing baking time is 8 h; then the temperature of the dry bulb is increased to 48 ℃ at the heating rate of 3 h/DEG C, the relative humidity is 55 percent, the main veins of the tobacco leaves in the stable-temperature and high-temperature areas are faded and whitened, the leaves are wound into small rolls, and the water loss rate of the tobacco leaves is 58 percent; the branch vein at the base of the tobacco leaf in the low-temperature area is completely white, the leaf is hooked and curled, and the water loss rate is-42%;

the relative humidity in the baking room at the later stage of color fixing is 40%, the temperature is stabilized at 54 ℃ until the leaves of the whole oven are completely dry and the leaves of the big reel are dry, and the water loss rate of the tobacco leaves is 78%; the fixing period is a stage of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early stage and a fixing later stage; and during color fixing, the temperature, the humidity, the tobacco condition and the water loss rate of the tobacco are controlled, so that the tobacco prepared from the tobacco is good in quality and meets the requirements.

Example 15:

on the basis of examples 1 to 14, at the earlier stage of fixing: the relative humidity in the baking room is 62 percent, and the temperature-stabilizing baking time is 8 hours; then the temperature of the dry bulb is raised to 48 ℃ at the temperature raising speed of 2.5 h/DEG C, the relative humidity is 52 percent, the main veins of the tobacco leaves in the stable-temperature and high-temperature areas are faded and whitened, the leaves are wound into small rolls, and the water loss rate of the tobacco leaves is 50 percent; the branch vein at the base part of the tobacco leaf in the low-temperature area is completely white, the tip of the leaf is hooked and curled, and the water loss rate is 36-42%;

the relative humidity in the baking room at the later stage of color fixing is 38%, the temperature is stabilized at 54 ℃ until the leaves of the whole oven are completely dry and the leaves of the big reel are dry, and the water loss rate of the tobacco leaves is 75%; the fixing period is a stage of fixing the color and the internal quality of the tobacco leaves, and comprises a fixing early stage and a fixing later stage; and during color fixing, the temperature, the humidity, the tobacco condition and the water loss rate of the tobacco are controlled, so that the tobacco prepared from the tobacco is good in quality and meets the requirements.

Example 16:

on the basis of the embodiments 1 to 15, the relative humidity in the baking room in the gluten drying period is 35 percent, and the temperature-stabilizing baking time is 10 hours; then the temperature is raised to 67 ℃ at the temperature raising speed of 1 h/DEG C, the relative humidity is 15 percent, the temperature is stabilized until the main vein of the whole-furnace tobacco leaves is dried, and the water loss rate is 93 percent; the tobacco leaves obtained in the dry stem period are convenient to obtain, and the requirements are met.

Example 17:

on the basis of the embodiments 1 to 16, the relative humidity in the baking room in the gluten drying period is 35 percent, and the temperature-stabilizing baking time is 10 hours; then the temperature is raised to 67 ℃ at the temperature raising speed of 1 h/DEG C, the relative humidity is 15 percent, the temperature is stabilized until the main vein of the whole-furnace tobacco leaves is dried, and the water loss rate is 96 percent; the tobacco leaves obtained in the dry stem period are convenient to obtain, and the requirements are met.

Example 18:

on the basis of the embodiments 1 to 17, the relative humidity of the baking room in the dry gluten period is 35 percent, and the temperature-stabilizing baking time is 10 hours; then the temperature is raised to 67 ℃ at the temperature raising speed of 1 h/DEG C, the relative humidity is 15 percent, the temperature is stabilized until the main vein of the whole furnace tobacco leaves is dried, and the water loss rate is 94 percent; the tobacco leaves obtained in the dry stem period are convenient to obtain, and the requirements are met.

Example 19:

on the basis of examples 1-18, the baking process was through a yellowing stage, a fixing stage and a drying stage. In the early stage of yellowing: after ignition, the temperature of the dry bulb is increased to 35 ℃ at the temperature increasing speed of 1 h/DEG C, the relative humidity is controlled to be stabilized at 95%, and the leaf tip of the temperature stabilizing high-temperature area begins to turn yellow. In the middle stage of yellowing: the temperature of the dry bulb is raised to 38 ℃ at the temperature rising speed of 1 h/DEG C, the relative humidity is controlled to be stabilized at 90%, the base mesophyll of the tobacco leaves at the stable temperature and the high temperature region is basically yellow, the branch veins of the leaf tips become white, and the leaves are soft. In the later yellowing stage: the temperature of the dry ball is raised to 40 ℃ at the temperature raising speed of 2 h/DEG C, the relative humidity is controlled to be kept at 75%, and the baking is carried out for 8h at a stable temperature; and then raising the temperature of the dry bulb to 42 ℃ at the temperature raising speed of 2 h/DEG C, controlling the relative humidity to keep 65%, stabilizing the temperature to a high-temperature region, enabling the veins of the leaf base to be basically full yellow (allowing the base to have 2 pairs of left and right veins containing cyan), and hooking and curling the leaf tip. In the early stage of fixation in the fixation period: the temperature of the dry ball is raised to 45 ℃ at the temperature raising speed of 2 h/DEG C, the relative humidity is controlled to be kept at 60%, and the baking is carried out for 8h at a stable temperature; and then the temperature of the dry bulb is raised to 48 ℃ at the heating rate of 3 h/DEG C, the relative humidity is controlled to be kept at 50%, and the main veins of the tobacco leaves in the stable-temperature high-temperature region are faded and whitened, and the leaves are wound into small rolls. At the later stage of color fixing: the temperature of the dry bulb is raised to 54 ℃ at the temperature raising speed of 2 h/DEG C, the relative humidity is controlled to be kept at 40 percent, and the temperature is stabilized until the full-dry and large winding drum of the full-furnace blade. In the dry rib period, the temperature of a dry ball is increased to 60 ℃ at the temperature increasing speed of 1 h/DEG C, the relative humidity is controlled to be kept at 35%, and the dry ball is baked for 10h at a stable temperature; and raising the temperature of the dry bulb to 67 ℃ at the temperature raising speed of 1 h/DEG C, controlling the relative humidity to keep 15 percent, and stabilizing the temperature until the main vein of the whole-furnace tobacco leaves is dried.

The appearance quality of the cured tobacco leaves has no obvious difference with the conventional curing method, the economic character is slightly improved, but the difference is not obvious. The obtained tobacco leaves are mainly medium-grade tobacco leaves.

TABLE 1 economic characteristics of tobacco leaves after baking by different baking methods

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.