CN112385881A

CN112385881A - Tobacco section for heating non-combustible cigarettes and preparation method thereof

Info

Publication number: CN112385881A
Application number: CN201910758368.7A
Authority: CN
Inventors: 张振涛; 张骥; 杨俊玲; 张化福; 张钰; 越云凯
Original assignee: Technical Institute of Physics and Chemistry of CAS
Current assignee: Technical Institute of Physics and Chemistry of CAS
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2021-02-23

Abstract

The invention provides a tobacco section for heating a non-burning cigarette and a preparation method thereof. According to the invention, tobacco sheets which are not cut into tobacco shreds are directly overlapped to form a tobacco section, so that the heat conductivity of the heating non-combustible cigarette is enhanced, the flavor components in the tobacco are released as far as possible, the heating non-combustible cigarette has less harmful substance release, and the fragrance concentration and the fragrance fullness can be comparable to those of the traditional cigarette; the preparation method of the tobacco section has simple process and low cost, and is suitable for mass production.

Description

Tobacco section for heating non-combustible cigarettes and preparation method thereof

Technical Field

The invention relates to the technical field of tobacco preparation, in particular to a tobacco section for heating non-combustible cigarettes and a preparation method thereof.

Background

The cigarette is not combusted by heating (such as an electric heating cigarette and a carbon heating cigarette), because the tobacco shred is heated at a lower temperature, the release amount of harmful substances is obviously lower than that of the traditional cigarette, and the low-temperature cigarette has less sidestream smoke volume and less influence on the environment. Therefore, low-temperature cigarettes of the heat non-combustion type are sought after by more and more consumers.

At present, tobacco sections in a cigarette which is not combusted by heating are generally formed by shredding and filling tobacco sheets, wherein the tobacco sheets are also called recombined tobacco leaves and homogenized tobacco leaves and mainly comprise tobacco powder, fragments, tobacco stems or inferior tobacco leaves added with adhesives and other additives. However, the tobacco shreds filled in the traditional cigarette mode have poor heat conductivity, so that the heating temperature of the tobacco shreds of the heating non-combustion cigarette is easily insufficient, the release rate of flavor components in the tobacco shreds is greatly reduced, and the aroma concentration and the aroma fullness of the heating non-combustion cigarette are far inferior to those of the traditional cigarette.

Aiming at the problem of poor heat conductivity, the improvement method in the prior art comprises the steps of additionally arranging heat conduction materials outside the cigarette paper or inside the tobacco section or adding an atomizing agent, an adhesive and the like into the tobacco shreds, but the production process is complicated by the methods, and the addition amount of the heat conduction materials is difficult to control.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a tobacco section for heating a non-burning cigarette and a preparation method thereof.

The tobacco section of the non-burning cigarette comprises a plurality of tobacco sheets which are stacked along the axial direction of the tobacco section.

In contrast to the conventional method, the tobacco sheets are not cut into tobacco shreds and are filled in a conventional cigarette mode, but the tobacco sheets are directly stacked along the axial direction of the tobacco sections (namely the vertical direction of the tobacco sheets), so that each tobacco sheet as a whole has better heat conductivity than the tobacco shreds with gaps and unconnected in the middle.

Preferably, one or more holes are formed in the tobacco sheets, and at least one ventilation groove is formed along the axial direction of the tobacco section after the tobacco sheets are stacked.

Because certain air circulation is needed during smoking, if the tobacco sheet is not provided with holes, special cigarette paper or a surrounding heating element with grooves (air grooves) is needed. In order to expand the application range of the tobacco section, one or more holes are arranged on the tobacco sheet, and at least one ventilation groove is formed along the axial direction of the tobacco section after the tobacco sheet is overlapped, so that the permeability in the tobacco section is kept.

The shape of the holes has no special requirement, and can be regular shapes such as circles, triangles, crosses, squares and the like, and can also be irregular shapes. The holes formed in a sheet may be the same or different and may be randomly positioned. The size and the number of the holes can be flexibly changed according to the requirements of actual conditions. The sizes, shapes and numbers of the holes formed in different sheets can be the same or different.

Preferably, the total area of the holes accounts for 5-30% of the tobacco sheet. The area ratio of the holes is controlled within the range, so that the permeability is ensured, and the sensory experience of smoking is not influenced.

Preferably, the tobacco sheet is provided with one or more holes, and at least one channel for the middle penetrating heating element to pass through is formed along the axial direction of the tobacco section after the tobacco sheet is overlapped.

The purpose of the design is to heat the non-combustible cigarette in a middle-piercing heating mode, and the heating element can be directly inserted into the hole of the tobacco sheet for heating. The specific hole shape can be adjusted according to the shape of the heating element. Thus, the tobacco segments of the present invention are suitable for both the peripheral heating type (also known as peripheral heating type) and the central piercing type.

The tobacco sheet of the invention is in regular shape such as round, square, quasi-round or triangular, and can also be in irregular shape. Preferably, each of said tobacco sheets has the same shape and size, which is advantageous for the manufacturing process and for the aesthetic appearance after packaging.

Preferably, to further increase the thermal conductivity of the tobacco sheet, the tobacco sheet is added with a thermally conductive material. The heat conducting material can be one or more of metal wires/powder such as copper, silver, aluminum and the like, high heat conducting carbon materials such as carbon fiber, carbon nano tube, graphene and the like, heat conducting high molecular polymers and heat conducting oxides (such as aluminum oxide and the like).

Furthermore, after metal wires/powder such as copper, silver, aluminum and the like and high-heat-conduction carbon materials such as carbon fibers, carbon nanotubes, graphene and the like are added, the heat conduction performance is enhanced, the electric conductivity can be enhanced to a certain degree, and the cigarette is better suitable for certain electrically-heated non-combustible low-temperature cigarettes.

The invention also provides a preparation method of the tobacco section, which comprises the following steps: and overlapping the tobacco sheets along the axial direction of the tobacco sections, and then wrapping the tobacco sheets by using cigarette paper.

Preferably, the preparation method further comprises the step of forming holes in the tobacco sheets in a mode of electrostatic drilling, laser drilling, mechanical drilling, shearing or cutting and the like.

In the present invention, when wrapping the tobacco sheet with the cigarette paper, the wrapping is not necessarily performed in accordance with the shape of the tobacco sheet. For example, when the tobacco sheet is triangular, it may be wrapped into tobacco segments that are circular in cross-section; for another example, when the tobacco sheet is round, it may be wrapped into tobacco segments having a square cross-section. This also allows for gaps between the tobacco sheet and the cigarette paper, increasing permeability within the tobacco segment.

To further enhance the thermal conductivity, the invention also includes adding a thermally conductive material to the tobacco sheet. The method of adding a thermally conductive material to a tobacco sheet comprises: directly adding heat conduction materials in the production process of the tobacco sheets, namely mixing the heat conduction materials with tobacco powder, fragments, tobacco stems or inferior tobacco leaves and the like, and then preparing the tobacco sheets;

or after the tobacco sheet is produced, the heat conduction material is added on the surface of the tobacco sheet by spraying, rolling, dipping or printing and the like.

According to the invention, tobacco sheets which are not cut into tobacco shreds are directly overlapped to form a tobacco section, so that the heat conductivity of the heating non-combustible cigarette is enhanced, the flavor components in the tobacco are released as far as possible, the heating non-combustible cigarette has less harmful substance release, and the fragrance concentration and the fragrance fullness can be comparable to those of the traditional cigarette; the preparation method of the tobacco section has simple process and low cost, and is suitable for mass production.

Drawings

FIG. 1 is a schematic view showing the structure of a tobacco section of a non-burning cigarette heated in example 1 of the present invention;

FIG. 2 is a cross-sectional view of a tobacco segment of a heated non-burning cigarette of example 2 of the present invention;

FIG. 3 is a cross-sectional view of a tobacco segment of a heated non-burning cigarette of example 3 of the present invention;

figures 4 to 6 are cross-sectional views of several different lengths of heat non-combustible tobacco smoking articles according to example 4 of the present invention.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

As shown in fig. 1, the present embodiment provides a tobacco section for a non-burning cigarette, which is composed of a plurality of tobacco sheets 2 stacked in the axial direction of the tobacco section and cigarette paper 1 wrapped around the tobacco sheets 2.

In this embodiment, each tobacco sheet 2 has a hole 3 in the center thereof, and the hole 3 allows the middle piercing heating element to pass through. The tobacco sheet 2 is a conventional product on the market, and mainly comprises tobacco powder, fragments, tobacco stems or inferior tobacco leaves, and is added with adhesive, other additives and the like.

The tobacco section of the embodiment is suitable for both the surrounding heating type (also called peripheral heating type) and the middle piercing type heating non-combustion cigarette.

The preparation method of the tobacco section provided by the embodiment comprises the following steps:

(1) firstly, processing a tobacco sheet 2 into a preset shape and size, and then forming holes 3 on the tobacco sheet by using modes of electrostatic drilling, laser drilling, mechanical drilling, shearing or cutting and the like;

(2) stacking the processed tobacco sheets 2 along the axial direction of the tobacco sections, wherein the tobacco sheets 2 are not required to be compacted during stacking and can be in a fluffy state;

(3) and finally, wrapping the tobacco leaves with cigarette paper 1.

Example 2

The present embodiment provides a tobacco section of a non-burning cigarette, which is composed of a plurality of tobacco sheets 2 stacked along the axial direction of the tobacco section and cigarette paper 1 wrapped outside the tobacco sheets 2, and the cross-sectional view of the tobacco section is shown in fig. 2.

The tobacco sheet 2 is square, when the cigarette paper 1 is used for wrapping, the cigarette paper 1 does not tightly wrap according to the shape of the tobacco sheet 2, but a gap is reserved between the cigarette paper 1 and the tobacco sheet 2, so that the permeability in a tobacco section is ensured.

Example 3

In this example, the tobacco sheet 2 was set to a triangular shape based on example 2, and the outer periphery thereof was wrapped in a cylindrical shape with a wrapper 1, and the cross-sectional view of the resulting tobacco segment was shown in fig. 3.

Example 4

The embodiment provides a tobacco section for heating a non-burning cigarette, which comprises a plurality of tobacco sheets 2 stacked along the axial direction of the tobacco section and cigarette paper 1 wrapped outside the tobacco sheets 2.

Wherein, the tobacco sheet 2 is provided with holes 3, the holes 3 are in the shape of circle, triangle, cross, square or polygon, the size, position and number of the holes 3 can be flexibly changed according to the actual situation requirement, but the hole area accounts for 5% -30% of the tobacco sheet, as shown in fig. 4-6.

Example 5

This embodiment still includes to carry out the spraying heat conduction material to tobacco sheet 2 on the basis of embodiment 1, the heat conduction material is high heat conduction carbon fiber, and the quantity accounts for 8% of tobacco sheet 2 weight.

Performance testing

After adding the high thermal conductivity material, the thermal conductivity of the tobacco sheet in example 5 is from 0.14Wm^-1K^-1Increased to 0.72Wm^- ¹K^-1. The evaluation group consisted of 9 evaluation experts, smoking tobacco sections were smoked with a needle-type inner core heating device, and the tobacco sections of the cigarette prepared in examples 1 to 5 were subjected to evaluation of smoke release performance and sensory quality, and the control sample was smoked with a conventional cigarette. It was found that the smoke amount in examples 1 to 4 was sufficient, the satisfaction was good, the fragrance was floating, and the resistance to draw was low, and the smoke amount in example 5 was sufficient, rich, good satisfaction, rich fragrance, sensory quality closer to that of the conventional cigarette, and the resistance to draw was low.

Finally, the examples are only preferred embodiments and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tobacco section for heating a non-combustible cigarette is characterized by comprising a plurality of tobacco sheets which are stacked along the axial direction of the tobacco section.

2. A tobacco segment according to claim 1 wherein the tobacco lamina is perforated with one or more perforations which, when superimposed, define at least one ventilation slot along the axis of the tobacco segment.

3. A tobacco segment according to claim 2 wherein the total area of the holes comprises between 5% and 30% of the tobacco sheet.

4. A tobacco segment according to claim 1 wherein the tobacco sheet is perforated with one or more perforations which, when superimposed, define at least one channel along the axis of the tobacco segment through which the central piercing heating element passes.

5. A tobacco segment according to any one of claims 1 to 4, wherein each of the pieces of tobacco sheet has the same shape and size.

6. A tobacco segment according to any one of claims 1 to 5 wherein the tobacco sheet is supplemented with a heat conductive material.

7. The tobacco segment of claim 6 wherein the thermally conductive material includes, but is not limited to, copper, silver, aluminum, carbon fibers, carbon nanotubes, graphene, thermally conductive high molecular polymers, thermally conductive metal oxides.

8. A method of producing tobacco segments according to any one of claims 1 to 7, comprising: and overlapping the tobacco sheets along the axial direction of the tobacco sections, and then wrapping the tobacco sheets by using cigarette paper.

9. The method of claim 8, further comprising forming holes in the tobacco sheet by electrostatic drilling, laser drilling, mechanical drilling, shearing, or cutting.

10. The method of claim 8, wherein the step of adding a thermally conductive material to the tobacco sheet comprises: directly adding heat conduction materials in the production process of the tobacco sheets; or, after the tobacco sheet is produced, the heat conduction material is added on the surface of the tobacco sheet by spraying, rolling, dipping or printing.