CN113576020A

CN113576020A - Preparation method of smoke generating material for smoking product

Info

Publication number: CN113576020A
Application number: CN202110881225.2A
Authority: CN
Inventors: 巩效伟; 赵伟; 秦云华; 韩熠; 杨柳; 朱东来; 吴俊�; 赵杨; 段沅杏; 李廷华; 田永峰; 李寿波
Original assignee: China Tobacco Yunnan Industrial Co Ltd
Current assignee: China Tobacco Yunnan Industrial Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2021-11-02
Also published as: WO2023011003A1

Abstract

The invention belongs to the technical field of heating cigarettes, and particularly relates to a preparation method of a smoke generating material for smoking products. The preparation method comprises the following steps: (1) drying one or more dry materials, and controlling the water content of the dry materials to be 0.01-10.0 wt%; (2) respectively crushing one or more dry materials obtained in the step (1) to the size of 2-75 mu m, and mixing; (3) mixing one or more wet materials to obtain a wet material mixture; (4) mixing the dry material mixture and the wet material mixture obtained in the steps (2) and (3) to obtain a dry-wet mixed material with the water content of 5.0 wt% -9.0 wt%; (5) pressing at a pressure of 200 ℃ and 700kN to obtain an absolute density of 1.5g/cm³‑2.5g/cm³The block-shaped materials; (6) crushing and sieving to obtain 100-1000 micron granular material, i.e. smoke generating material. The invention uses pressure as a main mode to lead the materials to be aggregated and formed instead ofThe water substitute is used as a wetting agent to assist in the bonding and forming mode, and the granular smoke generating material which does not need to be dried again is obtained.

Description

Preparation method of smoke generating material for smoking product

Technical Field

The invention belongs to the technical field of heating cigarettes, and particularly relates to a preparation method of a smoke generating material for smoking products.

Background

The heated smoking article delivers a reduction in the harmful constituents contained in the aerosol of more than 90% compared to conventional smoking articles, and thus has a lower hazard. Heated smoking articles generally comprise a piece of aerosol generating material, and a cooling assembly connected to the piece of aerosol generating material. The aerosol desired by the consumer is obtained by heating an smoking article comprising an aerosol generating material using a heating means. Common aerosol generating materials are in the form of sheets, filaments, or granules.

The sheet, thread and particle aerial fog generating material in the prior art comprises the processes of mixing, forming, drying and the like of dry materials and wet materials. In order to facilitate forming, water with different proportions is added into the mixture, and therefore drying is an essential process. Drying can have the undesirable consequence of loss of flavor components.

Disclosure of Invention

Aiming at the defects, the invention provides the preparation method of the granular smoke generating material, which solves the forming problem through process innovation, does not need a drying procedure and obtains good effect.

The invention provides a method for preparing an aerosol generating material for a smoking article, which comprises the following steps:

mixing dry materials and wet materials to obtain dry and wet mixed materials, pressing the dry and wet mixed materials into blocky materials, crushing and screening the blocky materials to obtain granular materials, namely the smoke generating materials.

Preferably, the water content of the dry and wet mixture is controlled to be between 5.0 wt% and 9.0 wt%, and the density of the blocky material is 1.5g/cm³-2.5g/cm³。

Preferably, a binder is also added when the dry material is mixed with the wet material.

Preferably, the dry material has a water content of 0.01 wt% to 10.0 wt% and a size of 2 to 75 μm.

Preferably, the method of preparing an aerosol generating material for a smoking article comprises the steps of:

(1) drying the one or more dry materials;

(2) respectively crushing one or more dry materials obtained in the step (1), and mixing to obtain a dry material mixture;

(3) mixing one or more wet materials to obtain a wet material mixture;

(4) mixing the dry material mixture and the wet material mixture obtained in the steps (2) and (3) according to the weight percentage of 1.8-3:1 to obtain a dry-wet mixed material with the water content of 5.0-9.0 wt%;

(5) pressing the dry and wet mixture obtained in the step (4) at the pressure of 200kN and 700kN to obtain the absolute density of 1.5g/cm³-2.5g/cm³The block-shaped materials;

(6) and (4) crushing and screening the blocky materials obtained in the step (5) to obtain granular materials with the particle size of 100-1000 microns, namely the smoke generating materials.

Preferably, in the step (1), the water content of the dried material after drying is 0.01 wt% -10.0 wt%.

Preferably, in step (2), the dried material is pulverized to have a size of 2 to 75 μm.

Preferably, a binder may be further added at the time of mixing in step (4). The binder is one or more of hydroxypropyl methylcellulose, carboxymethyl cellulose and guar gum. When the dry material is selected from plant fibers, the plant itself carries the endogenous binder, and in this case, no binder may be added.

Preferably, the dry material is selected from one or more of tobacco powder, stalk powder, plant starch, modified starch, cyclodextrin, microcrystalline cellulose, crushed powder of plant roots or stems or leaves or fibers, mineral powder and metal powder.

Preferably, the wet material is selected from one or more of a smoke agent and a liquid essence, and specifically, the wet material is selected from one or more of propylene glycol, glycerol, ethanol, a plant extract and an essence.

Preferably, the binder accounts for 0.5-3% of the total mass of the dry and wet mix.

Wherein:

the water content of the dry material in the step (1) is 0.01-10.0%, and the method is suitable for most available materials, such as mineral materials, metal materials or plant materials. Such as mineral or metallic materials, the moisture content is generally very low, while plant materials contain some moisture, which generally adversely affects comminution when the moisture content exceeds 10.0%.

And (4) mixing the dry and wet mixed materials, adding a proper amount of water according to the water content of the dry and wet mixed materials, and controlling the water content of the materials to be between 5 and 9 percent, wherein the water content determines the water content of the finally obtained smoke generating material, and the range is beneficial to the smoking quality performance of the smoke generating material.

The parameters of the pressing rate, the pressing time and the like are not limited in the step (5), because the sizes of equipment models and specifications are different, the pressing rate and the pressing time have larger difference, and after the pressure range is limited, whether the requirements of the granular smoke generating material are met or not is measured by the density of the block materials in practice, and the pressing rate and the pressing time are adjusted in turn. Under too low or too high a pressure, lumps of the desired density are usually not obtained.

Step (6) carefully selecting crushing equipment, wherein the rotating speed and the cutting mode are key. Generally, more gentle crushing readily results in the desired particulate aerosol generating material of the present invention. This step inevitably produces undesirable fines of smaller particle size which are in practice recycled to reduce material losses.

Compared with the prior art, the invention has the following beneficial effects:

1. aiming at the defects of the preparation technology of the smoke generating material in the background technology, namely the condition that the process of adding water and then drying causes the loss of fragrance, the invention provides a novel preparation method for the preparation of the granular smoke generating material, and particularly provides a method for preparing the granular smoke generating material by using pressure as a main mode to agglomerate and form the material, replacing water as a wetting agent to assist in bonding and forming, so that the granular smoke generating material which does not need to be dried again is obtained, and the loss of fragrance components caused by the smoke generating material in the drying process is avoided.

2. Most importantly, the conventional preparation process of the fuming particles directly uses the powdery mixture for granulation to directly obtain products with specified particle size, namely, the products are prepared into particles from small to large. The invention presses the powder mixture into large block material, then crushes the block material into product with specified grain diameter, that is, the product is prepared from small to large and then to small, thus the original preparation idea of the granule is overturned.

Detailed Description

The present invention is further illustrated by the following examples, but is not limited to these examples. The experimental methods not specified in the examples are generally commercially available according to the conventional conditions and the conditions described in the manual, or according to the general-purpose equipment, materials, reagents and the like used under the conditions recommended by the manufacturer, unless otherwise specified. The starting materials required in the following examples and comparative examples are all commercially available.

Example 1

A method of making an aerosol generating material for a smoking article comprising the steps of:

step (1): taking middle tobacco leaves (1kg) of certain variety of flue-cured tobacco, and balancing until the water content is 10.0 wt%;

step (2): pulverizing by jet milling, and sieving to obtain fine powder (0.95 kg) of 2-75 μm;

and (3): taking 0.475kg of glycerol;

and (4): uniformly mixing 0.95kg of tobacco leaf fine powder and 0.475kg of glycerol (the ratio of the two is 2:1) to obtain a mixture with the water content of 6.67 wt%;

and (5): putting the mixture into a container of a pressing device, pressing the mixture at a pressure of 200kN until the mixture is in a solid block shape to obtain a density of 1.5g/cm³The block material of (2);

and (6): mechanically crushing the block material, and sieving to obtain 100-180 micron granular material as the smoke generating material. The crushing operation is as follows: a hammer mill is adopted, the set rotating speed is 500r/min, and the crushing time is 3 s.

Example 2

step (1): taking a certain variety of flue-cured tobacco middle tobacco leaves (1kg) and tobacco stems (1kg), and balancing to the moisture content of 10.0 wt% and 5.0 wt% respectively;

step (2): pulverizing respectively by jet milling, and sieving to obtain fine powder of 2-75 μm (0.95kg tobacco leaf fine powder and 0.97kg tobacco stalk powder);

and (3): taking 0.38kg of glycerol and 0.095kg of propylene glycol;

and (4): uniformly mixing 0.76kg of tobacco leaf fine powder, 0.19kg of tobacco stem powder, 0.38kg of glycerol and 0.095kg of propylene glycol (the proportion of dry materials to wet materials is 2:1) to obtain a mixture with the water content of 6 wt%;

and (5): putting the mixture into a container of a pressing device, pressing the mixture at a pressure of 200kN until the mixture is in a solid block shape to obtain a density of 2.5g/cm³The block material of (2);

Example 3

step (1): taking a certain variety of flue-cured tobacco middle tobacco leaves (1kg) and tobacco stems (1kg), and balancing to the moisture content of 10.0 wt% and 5.0 wt% respectively; preparing 800 mesh calcium carbonate fine powder (about 18 μm) and 200 mesh copper metal powder (about 75 μm);

and (3): taking 0.250kg of glycerol, 0.050kg of propylene glycol and 0.0051kg of tobacco essence;

and (4): uniformly mixing 0.76kg of tobacco leaf fine powder, 0.19kg of tobacco stem powder, 0.1kg of calcium carbonate, 0.01kg of copper powder, 0.250kg of glycerol, 0.050kg of propylene glycol, 0.0051kg of tobacco essence and 0.048kg of water (the ratio of dry materials to wet materials is 3:1) to obtain a mixture with the water content of 9.45 wt%;

and (5): putting the mixture into a container of a pressing device, pressing the mixture at 700kN until the mixture is solid and blocky, and obtaining the density of 2.5g/cm³The block material of (2);

and (6): mechanically crushing the block material, and sieving to obtain 100-180 micron granular material as the smoke generating material.

Comparative example 1

The mixing was completed as in steps (1), (2), (3) and (4) of example 1, and 0.233kg of water was added in step (4) and mixed well. Preparing the obtained material into granules by a swinging extrusion granulator, drying the granules at 90 ℃ until the water content of the granules is 6.7%, and screening and taking 100-180 mu m granules, namely the smoke generating material.

The aerosol generating materials prepared in examples 1 to 3 and comparative example 1 were filled into the smoking section of the same conventional particulate cigarette and then inserted into the same heated cigarette smoking set for a heated smoking operation. Sensory quality evaluations were made on 4 aerosol generating materials and the results are shown in table 1.

TABLE 14 smoking evaluation results of the Aerosol Material

Sample (I)	Amount of smoke (30 minutes)	Aroma (30 points)	Stiff head (20 minutes)	Miscellaneous gas (20 minutes)
					Example 1	30	29	18	19
Example 2	30	28	18	19
					Example 3	29	30	20	18
Comparative example 1	29	25	15	19

Table 1 demonstrates that: the smoke generating materials of examples 1-3 of the present invention had higher aroma and strength scores than the smoke generating material of comparative example 1, indicating that the loss of aroma from the pellets without the drying process was less and better meeting the smoking requirements of the consumer.

Claims

1. A method of making an aerosol generating material for a smoking article comprising the steps of:

2. A method of making an aerosol generating material for a smoking article according to claim 1, wherein the moisture content of the wet and dry blend is controlled to be between 5.0 wt% and 9.0 wt% and the bulk material has a density of 1.5g/cm³-2.5g/cm³。

3. A method of making an aerosol generating material for a smoking article according to claim 1, wherein a binder is added to the dry material when it is mixed with the wet material.

4. A method of making an aerosol generating material for a smoking article according to claim 1, wherein the dry material has a moisture content of from 0.01% to 10.0% by weight and a size of from 2 to 75 μm.

5. A method of making an aerosol generating material for a smoking article according to claim 1, comprising the steps of:

(1) drying the one or more dry materials;

(3) mixing one or more wet materials to obtain a wet material mixture;

6. A method of making an aerosol generating material for a smoking article according to claim 5, wherein in step (1) the dried material has a moisture content of from 0.01% to 10.0% by weight after drying and in step (2) the dried material has a size of from 2 to 75 μm after comminution.

7. A method of making an aerosol generating material for a smoking article according to claim 1 wherein a binder is added during the mixing in step (4).

8. A method of making an aerosol generating material for a smoking article according to claim 1, wherein the dry material is selected from one or more of tobacco powder, stalk powder, plant starch, modified starch, cyclodextrin, microcrystalline cellulose, comminuted plant roots or stems or leaves or fibres, mineral powder, metal powder.

9. A method of making an aerosol generating material for a smoking article according to claim 1, wherein the wet material is selected from one or more of a smoke generator and a liquid flavourant.

10. A method of making an aerosol generating material for a smoking article according to claim 3, wherein the mass ratio of the binder to the wet and dry blend is between 0.5 and 3%.