阅读说明：本技术 一种新型加热卷烟烟丝的在线干燥方法 (Novel on-line drying method for heating cigarette tobacco shreds ) 是由 周国俊 吴键 储国海 许式强 蒋健 王骏 鲁端峰 黄锋 李斌 张明建 夏倩 蔡 于 2021-01-20 设计创作，主要内容包括：本发明的目的在于提供一种新型加热卷烟烟丝的在线干燥方法,该方法包括如下两个步骤：步骤1)通过制叶段将天然烟叶水分提高至18.5-20.5%,进行切丝,将烟丝宽度控制至0.9至1.1毫米；步骤2)将烟丝进行高温气流干燥处理,将烟丝水分降低至9.5-10.5%；步骤3)将烟丝进行增温润丝处理,将烟丝温度提高至86℃±3,控制烟丝中保润剂含量为2-6%；步骤4)将烟丝进行滚筒干燥处理,将水分降至3%以下。(The invention aims to provide a novel on-line drying method for heating cigarette tobacco shreds, which comprises the following two steps: step 1) increasing the moisture of natural tobacco leaves to 18.5-20.5% through a leaf making section, and shredding to control the width of tobacco shreds to 0.9-1.1 mm; step 2), performing high-temperature airflow drying treatment on the cut tobacco to reduce the moisture of the cut tobacco to 9.5-10.5%; step 3) heating and moistening the cut tobacco, increasing the temperature of the cut tobacco to 86 +/-3 ℃, and controlling the content of the humectant in the cut tobacco to be 2-6%; and 4) carrying out roller drying treatment on the tobacco shreds to reduce the moisture to below 3%.)

1. A novel on-line drying method for heating cigarette tobacco shreds is characterized by comprising the following steps:

step 1) increasing the moisture of natural tobacco leaves to 18.5-20.5% through a leaf making section, and shredding to control the width of tobacco shreds to 0.9-1.1 mm;

step 2), performing high-temperature airflow drying treatment on the cut tobacco to reduce the moisture of the cut tobacco to 9.5-10.5%;

step 3) heating and moistening the cut tobacco, increasing the temperature of the cut tobacco to 86 +/-3 ℃, and controlling the content of the humectant in the cut tobacco to be 2-6%;

and 4) carrying out roller drying treatment on the tobacco shreds to reduce the moisture to below 3%.

2. The on-line drying method of claim 1, wherein the humectant is one or a mixture of 1, 2-propanediol, glycerol, and 1, 3-butanediol.

3. The on-line drying method as claimed in claim 1, wherein the process gas temperature in step 2) is 200-.

4. The on-line drying method according to claim 1, wherein the flow rate of the moistening gas in the step 3) is 55-70kg/h, and the addition amount of the moistening agent is 2-7%.

5. The on-line drying method as claimed in claim 1, wherein the negative pressure generated in step 4) is-23-15 ubar, the temperature of the cylinder wall is 150-.

6. The novel heated cut tobacco for cigarettes obtained by the on-line drying method according to any one of claims 1 to 5, wherein the moisture content of the cut tobacco is less than 3%, and the cut tobacco finishing rate is improved to more than 80%.

7. The novel heated cut tobacco for cigarettes obtained by the on-line drying method according to any one of claims 1 to 5, wherein the moisture content of the cut tobacco is less than 3%, and the cut tobacco finishing rate is increased to more than 85%.

Technical Field

The invention belongs to the field of novel tobacco, and particularly relates to an on-line drying technology for heating cigarette tobacco shreds.

Background

Compared with the traditional cigarette, the novel heating cigarette has the basic condition that the tobacco shreds are required to be preheated to about 300 ℃, and if the moisture in the tobacco shreds is not sufficiently treated, water vapor is generated during smoking, so that the smoke temperature is high. According to the research, the natural tobacco leaves need to be applied to heating cigarettes, the moisture of tobacco shreds needs to be reduced to be below 3%, and the overhigh smoke temperature caused by water vapor during smoking is avoided.

Disclosure of Invention

Aiming at the technical problem that the shredded tobacco quantity is rapidly increased due to over-low moisture of the shredded tobacco in the production process of the shredded tobacco, so that the shredded tobacco is wasted, the invention adopts a combined drying production mode of high-temperature airflow drying, warming and moistening and low-temperature roller drying, and improves the whole tobacco shred rate to more than 80% under the condition of ensuring that the moisture of the shredded tobacco is less than 3%; at present, no production technology and production line aiming at novel heating cigarettes exist in the industry.

The invention aims to provide a novel on-line drying method for heating cigarette tobacco shreds, which improves the whole tobacco shred rate to more than 80% under the condition of ensuring that the moisture content of the tobacco shreds is less than 3%.

In order to achieve the purpose of the invention, the invention specifically adopts the following technical scheme:

step 1) increasing the moisture of natural tobacco leaves to 18.5-20.5% through a leaf making section, and shredding to control the width of tobacco shreds to 0.9-1.1 mm;

step 2), performing high-temperature airflow drying treatment on the cut tobacco to reduce the moisture of the cut tobacco to 9.5-10.5%;

step 3) heating and moistening the cut tobacco, increasing the temperature of the cut tobacco to 86 +/-3 ℃, and controlling the content of the humectant in the cut tobacco to be 2-6%;

and 4) carrying out roller drying treatment on the tobacco shreds to reduce the moisture to below 3%.

In some embodiments, the humectant is one or a mixture of 1, 2-propanediol, glycerol, and 1, 3-butanediol.

In some embodiments, the process gas temperature in step 2) is 200-.

In some embodiments, the flow rate of the moistening gas in the step 3) is 55-70kg/h, and the addition amount of the moistening agent is 2-7%.

In some embodiments, the negative pressure generated in step 4) is-23 to-15 ubar, the temperature of the cylinder wall is 150-.

In some embodiments, the novel on-line drying method for the heated cigarette tobacco provided by the invention comprises the following steps: step 1) increasing the moisture of natural tobacco leaves to 18.5-20.5% through a leaf making section, and shredding to control the width of tobacco shreds to 0.9-1.1 mm; step 2) carrying out high-temperature airflow drying treatment on the tobacco shreds, controlling parameters such as process gas temperature, expansion steam flow, moisture-removing negative pressure, fan rotating speed, anti-caking steam and the like, and reducing the moisture of the tobacco shreds to 9.5-10.5%; step 3) heating and moistening the cut tobacco, controlling the flow of heating and moistening gas, increasing the temperature of the cut tobacco to 86 +/-3 ℃, and controlling the content of a humectant in the cut tobacco to be 2-6 percent, wherein the humectant is one or a mixed solution of 1, 2-propylene glycol, glycerol and 1, 3-butanediol; step 4) carrying out roller drying treatment on the cut tobacco, controlling production negative pressure, barrel wall temperature, barrel rotating speed, hot air temperature, hot air speed and moisture removal negative pressure parameters, reducing the moisture content to be below 3%, and entering a flavoring section production line; specifically, the process parameters of the steps 2) to 3) are shown in the following table 1:

TABLE 1

In one specific embodiment, the moisture of the natural tobacco leaves is increased to 19.0% through the leaf making section in the step 1), and the tobacco shreds are cut, and the width of the tobacco shreds is controlled to be 1.0 mm; step 2) carrying out high-temperature airflow drying treatment on the cut tobacco, controlling the temperature of process gas to be 230 ℃, the flow rate of expansion steam to be 40kg/h, the negative pressure of moisture discharge to be-7 mbar, the rotating speed of a fan to be 2470rpm and anti-agglomeration steam to be 1 bar; step 3) heating and moistening, wherein the gas flow of the heating and moistening is controlled to be 60kg/h, the temperature of the cut tobacco is increased to 83 ℃, and the content of the humectant 1, 2-propylene glycol in the cut tobacco is controlled to be 4%; and 4) performing roller drying treatment on the cut tobacco, controlling the production negative pressure to be-20 ubar, the cylinder wall temperature to be 140 ℃, the cylinder rotating speed to be 17rpm, the hot air temperature to be 140 ℃, the hot air speed to be 0.5m/s, the moisture discharge negative pressure to be-20 mbar, reducing the moisture of the cut tobacco to be 2.3%, and controlling the whole tobacco rate to be 85.6%. Meets the requirements of moisture and filament-finishing rate, and can enter a flavoring section.

The moisture of the novel heated cigarette tobacco shreds obtained by the method is less than 3 percent, and the whole tobacco shred rate is improved to more than 80 percent; preferably, the filament-adjusting rate is increased to more than 85%.

Compared with the prior art, the drying production method reduces the moisture of the cut tobacco from 20% to below 3%, and improves the whole tobacco shred rate by more than 10%.

Drawings

FIG. 1 is a process flow diagram of an on-line drying method provided by the present invention.

Detailed Description

The airflow drying equipment, the temperature-increasing wetting equipment and the roller drying equipment provided by the embodiment are all existing equipment.

Model of the pneumatic drying equipment: HAUNI HD 1-A11; the model of the warming and moistening equipment is as follows: HAUNI HT-63; the type of the roller drying equipment: HAUNI KLD-2.

Comparative example 1 pure air drying method

Step 1) increasing the moisture of natural tobacco leaves to 18.5% through a leaf making section, and shredding to control the width of tobacco shreds to 1.0 mm;

and 2) carrying out high-temperature airflow drying treatment on the tobacco shreds, controlling the temperature of process gas to be 240 ℃, the flow rate of expansion steam to be 40kg/h, the negative pressure of moisture discharge to be-7 mbar, the rotating speed of a fan to be 2470rpm, the anti-agglomeration steam to be 0.5bar, reducing the moisture of the tobacco shreds to 8.3%, wherein the filament-finishing rate is 86.1%, and the filament-finishing rate is higher by adopting a pure airflow drying mode, but the requirement that the moisture of the processed tobacco shreds is lower than 3% cannot be met.

Comparative example 2 pure drum drying method

Step 1) the moisture of the natural tobacco leaves is improved to 18.5% through the leaf making section, and the tobacco shreds are cut into 1 mm.

And 2) performing roller drying treatment on the cut tobacco, controlling the production negative pressure to be-21 ubar, the cylinder wall temperature to be 150 ℃, the cylinder rotating speed to be 15rpm, the hot air temperature to be 153 ℃, the moisture discharge negative pressure to be-20 mbar, reducing the moisture of the cut tobacco to be 2.8%, and reducing the cut tobacco finishing rate to be 63.5%, wherein the moisture of the cut tobacco can be reduced to be below 3% by adopting a pure roller drying mode, but the cut tobacco finishing rate is lower, so that the waste of the cut tobacco is caused.

Example 1 Combined drying production mode of "high temperature air flow drying + Low temperature roller drying

Step 1) increasing the moisture of natural tobacco leaves to 18.5% through a leaf making section, and shredding to control the width of tobacco shreds to 1.0 mm;

step 2) carrying out high-temperature airflow drying treatment on the tobacco shreds, controlling the temperature of process gas to be 230 ℃, the flow rate of expansion steam to be 40kg/h, the negative pressure of moisture discharge to be-7 mbar, the rotating speed of a fan to be 2470rpm and anti-agglomeration steam to be 0.5 bar;

and 3) performing roller drying treatment on the tobacco shreds, controlling the production negative pressure to be-20 ubar, the cylinder wall temperature to be 130 ℃, the cylinder rotating speed to be 17rpm, the hot air temperature to be 130 ℃, the moisture-removing negative pressure to be-20 mbar, reducing the moisture of the tobacco shreds to 2.7%, and controlling the whole shred rate to be 80.5%. Meets the requirements of moisture and filament-finishing rate, and can enter a flavoring section.

Example 2 Combined drying mode of "high temperature air drying + heating and moistening and Low temperature roller drying

Step 1) increasing the moisture of natural tobacco leaves to 19.0% through a leaf making section, and shredding to control the width of tobacco shreds to 1.0 mm;

step 2) carrying out high-temperature airflow drying treatment on the cut tobacco, controlling the temperature of process gas to be 230 ℃, the flow rate of expansion steam to be 40kg/h, the negative pressure of moisture discharge to be-7 mbar, the rotating speed of a fan to be 2470rpm and anti-agglomeration steam to be 1 bar;

step 3) heating and moistening, wherein the gas flow of the heating and moistening is controlled to be 60kg/h, the temperature of the cut tobacco is increased to 83 ℃, and the content of the humectant 1, 2-propylene glycol in the cut tobacco is controlled to be 4%;

and 4) performing roller drying treatment on the cut tobacco, controlling the production negative pressure to be-20 ubar, the cylinder wall temperature to be 140 ℃, the cylinder rotating speed to be 17rpm, the hot air temperature to be 140 ℃, the hot air speed to be 0.5m/s, the moisture discharge negative pressure to be-20 mbar, reducing the moisture of the cut tobacco to be 2.3%, and controlling the whole tobacco rate to be 85.6%. Meets the requirements of moisture and filament-finishing rate, and can enter a flavoring section.