Colored cigarette paper with reduced combustion black rings and preparation and use thereof

Abstract

The present application belongs to the field of cigarette, and particularly relates to a preparation method of colored cigarette paper with reduced burning black circle. The cigarette base paper is imprinted with threads, then coated with modified dyeing solution, and then dried and cut, to obtain the colored cigarette paper. The strength of the imprinted threads is 2-10%. The modified dyeing solution is added with cigarette pigment and potassium organic acid additive. The present application also includes the colored cigarette paper prepared by the preparation method and the application of the colored cigarette paper in traditional cigarettes. The cigarette paper prepared by the preparation method can effectively improve the neatness of the burning line, and can also control the burning uniformity and the content of harmful components in mainstream smoke.

Description

Technical Field

[0001] The present invention relates to the field of burning cigarettes, and in particular to the field of colored cigarette paper modification. Background Art

[0002] Colored cigarette paper is a specialty cigarette paper that has emerged in recent years. Unlike traditional white cigarette paper, colored cigarette paper allows consumers to quickly identify the brand and approximate price of cigarettes, addressing the monotonous color of white cigarette paper and giving cigarettes a unique appearance. For safety reasons, colored cigarette paper is generally produced through post-production dyeing with natural extracts or pigment coating. For example, Yang Shaowen and others compounded tobacco pigments with other natural extracts such as black tea and cocoa to produce brown cigarette paper, which is now used in small quantities on Hongta Group's "Yuxi (Harmony)" product.

[0003] However, colored cigarette paper, loaded with small molecules like pigments and sugars, reduces its air permeability and slightly impairs its combustion performance. During cigarette combustion, the preheating process is prolonged, resulting in a wider burn line and the appearance of a dark circle. Furthermore, the coating liquid's composition is heterogeneous across the paper, causing variations in burn rates across the paper. This results in an uneven burn line and a jagged, "toothed" appearance, significantly reducing the appearance of the cigarette. Summary of the Invention

[0004] In response to the problems of existing colored cigarette paper such as large burning black circles, high harmful components in mainstream smoke, and unsatisfactory dyeing uniformity, the first purpose of the present invention is to provide a preparation method for colored cigarette paper that reduces burning black circles, aiming to provide cigarette paper that improves the dyeing uniformity of colored cigarette paper, improves the neatness of burning black lines, and helps to reduce harmful components.

[0005] The second object of the present invention is to provide colored cigarette paper with reduced combustion black circles prepared by the preparation method and its application in burning cigarettes.

[0006] A third object of the present invention is to provide a combustion cigarette comprising the colored cigarette paper.

[0007] Existing colored cigarette paper suffers from unsatisfactory burn line smoothness. To address this issue, the present invention attempts to improve it by employing a threaded structure. However, previous research and development revealed that an inappropriate threaded structure not only fails to improve burn line smoothness but can also introduce new problems. For example, the threaded structure can easily lead to uneven dyeing and white spaces, and the combustion process of the threaded structure can increase the levels of harmful components such as CO in mainstream smoke. To address these technical issues, the present invention provides the following solutions:

[0008] A method for preparing colored cigarette paper with reduced burning black rings comprises stamping threads (also known as ribbing) on ​​cigarette base paper, coating it with a modified dyeing liquid, and then drying and cutting the paper to obtain colored cigarette paper.

[0009] The thread strength of the stamping is 2 to 10%;

[0010] The modified dyeing liquid is added with tobacco pigment and organic acid potassium auxiliary agent.

[0011] The present invention provides a novel method for modifying cigarette base paper, which pre-threads the cigarette base paper and further combines the thread strength with the combined control of an organic acid potassium additive. This achieves synergy and improves the evenness of the burn line. Furthermore, it solves the problems of combustion caused by the thread structure and the release of harmful components in mainstream smoke.

[0012] The technical solution of the present invention is a scheme for modifying the combustibility of cigarette base paper. The base paper can be commercially available cigarette paper. For example, the production process of conventional non-ribbed cigarette paper produced by manufacturers such as China Tobacco Modi, Minfeng Paper, and Hengfeng Paper generally includes fiber beating (to which calcium carbonate, retention aids, combustion aids, etc. are typically added), papermaking, and slitting.

[0013] In the present invention, the combination of threading of base paper and its thread strength with the organic acid potassium additive is the key to synergistically improving the uniformity of combustion black lines, solving dyeing uniformity and reducing harmful components such as CO in mainstream smoke.

[0014] Preferably, the thread is a transverse thread.

[0015] Preferably, the thread strength is 4 to 8%.

[0016] In the present invention, under the control of the thread and its strength, the combination of organic acid potassium additives can synergistically improve the combustion uniformity, dyeing uniformity and mainstream smoke composition.

[0017] In the present invention, the solvent in the modified dyeing liquid is water or a mixed solvent of water and an organic solvent, and the organic solvent is a solvent that is allowed to be used in the cigarette field and is miscible with water.

[0018] Preferably, in the modified dyeing solution, the organic acid potassium auxiliary agent is at least one of potassium citrate, potassium malate and potassium tartrate.

[0019] Preferably, in the modified dyeing solution, the concentration of the organic acid potassium auxiliary agent is 1-5 wt‰, preferably 3-5 wt‰.

[0020] Preferably, in the modified dyeing liquid, the tobacco dye is tobacco extract or other natural extracts.

[0021] There is no particular requirement for the concentration of tobacco dye in the modified dyeing solution, and it can be, for example, 30 to 50 wt‰.

[0022] The present invention also provides colored cigarette paper with reduced burning black circles, which is prepared by the preparation method.

[0023] In the present invention, based on the control of the preparation method, the prepared colored cigarette paper can be given special structural characteristics, and colored cigarette paper with completely new characteristics can be obtained. Moreover, the colored cigarette paper prepared by the preparation method has excellent effects, for example, it can reduce the burning black circle and improve the neatness of the burning line. Moreover, it can also obtain good thread dyeing uniformity and better mainstream smoke release effect.

[0024] The present invention also provides an application of the colored cigarette paper with reduced combustion black circles prepared by the preparation method, which is used as cigarette paper for preparing burning cigarettes.

[0025] In a preferred application, the colored cigarette paper is used to roll tobacco shreds to obtain a burning section of a burning cigarette.

[0026] In a further preferred application, the threads of the colored cigarette paper are transverse threads based on the length direction of the burning cigarette, for example, the thread arrangement direction is perpendicular to the length direction of the burning cigarette.

[0027] The present invention also provides a burning rod for colored burning cigarettes that can reduce burning black circles, comprising a tobacco rod and colored cigarette paper wrapped on its surface, wherein the colored cigarette paper is the colored cigarette paper prepared by the method described above, and the thread of the colored cigarette paper is a transverse thread relative to the length direction of the burning rod.

[0028] The present invention also provides a colored burning cigarette capable of reducing burning black circles, comprising a burning rod, a filter rod, and tipping paper splicing the burning rod and the filter rod, wherein the burning rod is the burning rod.

[0029] Beneficial effects

[0030] The present invention provides a novel method for modifying cigarette base paper, which pre-threads the cigarette base paper and further combines the thread strength with the combined control of an organic acid potassium additive. This achieves synergy and improves the evenness of the burn line. Furthermore, it solves the problems of combustion caused by the thread structure and the release of harmful components in mainstream smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Combustion pictures of cigarettes made in Comparative Example 1, Comparative Example 3, Example 1, and Example 2; DETAILED DESCRIPTION

[0032] The following examples are intended to illustrate the present invention rather than to further limit the scope of protection of the present invention.

[0033] In the following cases, the base paper used is commercial cigarette paper. Unless otherwise stated, it refers to cigarette paper produced by China Tobacco Modi. For example, the basic parameters of the following brand A cigarette paper are: air permeability 80CU, basis weight 29g / m 2 , K / Na is 1 / 1.

[0034] The steps of dyeing and modifying cigarette paper are, for example: base paper - pressing threads - coating - drying - slitting.

[0035] The tobacco extract is a conventional tobacco extract in the industry, and the content of the tobacco extract components can be adjusted according to dyeing requirements, for example, to 30-50 wt.%; in the present invention, potassium citrate, potassium malate and other additives are added to the tobacco extract in the embodiment, and the content of the additives is, for example, 1-5 wt‰.

[0036] In the present invention, the modified cigarette paper is used to roll cigarettes using an existing method.

[0037] Rib strength is a crucial indicator of cigarette paper's appearance, representing the three-dimensional representation of the degree of relief left by the engraving machine on the paper's surface. This case study employed a computer image processing method developed by the Anhui Institute of Optics and Fine Mechanics to measure rib strength, based on the grayscale differences in the image produced by the differing reflectivity of embossed and non-embossed areas of ribbed cigarette paper.

[0038] Example 1

[0039] Brand A cigarette paper was selected as base paper, horizontal threads were embossed with a thread strength of 4%, tobacco extract (containing 4‰ potassium citrate) was coated, and tobacco natural color and flavor cigarette paper 1# was prepared after drying.

[0040] Example 2

[0041] Compared with Example 1, the only difference is that the thread strength is 8%, and the other operations and parameters are the same as Example 1. Tobacco natural color and flavor cigarette paper 2# is prepared.

[0042] Example 3

[0043] Compared with Example 1, the only difference is that potassium malate is used instead of potassium citrate, and other operations and parameters are the same as Example 1. Tobacco natural color and flavor cigarette paper 3# is prepared.

[0044] Comparative Example 1

[0045] Compared with Example 1, the only difference is that the thread structure is not provided. Other operations and parameters are the same as Example 1. Tobacco natural color and natural flavor cigarette paper 4# was prepared. Cigarette trial production was carried out using 4# cigarette paper. During the burning process of the cigarette, the black circle phenomenon was obvious, the burning line was uneven, and some parts were "jagged". See the attached for details. Figure 1 .

[0046] Comparative Example 2

[0047] Compared with Example 1, the only difference was that the thread strength was 15%. Other operations and parameters were the same as Example 1. A 5# tobacco color and flavor cigarette paper was produced. Its maximum color difference ΔE value was 1.98, and the color distribution was uneven, with sporadic white spots visible in some thread grooves.

[0048] Comparative Example 3

[0049] Compared with Example 1, the only difference is that potassium citrate is not added to the tobacco extract. Other operations and parameters are the same as in Example 1. Tobacco natural color and flavor cigarette paper 6# is prepared. Cigarette trial production is carried out using 6# cigarette paper. During the burning process of cigarettes, the black ring phenomenon is still relatively obvious. See the attached Figure 1 .

[0050] Comparative Example 4

[0051] Compared with Example 1, the only difference is that sodium malate is used instead of potassium citrate, and other operations and parameters are the same as Example 1. Tobacco natural color and flavor cigarette paper 7# is prepared.

[0052] The prepared cigarette paper was subjected to color difference measurement as follows: the Lab color model, a color calibration model specified by the International Commission on Illumination, was used to characterize the chromaticity of the cigarette paper, where: L represents brightness, ranging from 0-100, with 0 being the darkest and 100 being the lightest; a represents the color change from green to red, ranging from -128 to +128, with pure green being -128 and pure red being +128; b represents the color change from blue to yellow, ranging from -128 to +128, with pure blue being -128 and pure yellow being +128. The color difference ΔE (i.e., the color change between two points in the Lab color model) can be expressed as:

[0053] ΔE=√((ΔL)^2+〖(Δa)^2+(Δb)〗^2)

[0054] The larger the ΔE value, the greater the color difference between the two points, and the easier it is to distinguish. When ΔE is less than 1, the human eye cannot distinguish the color difference between the two points, and it can be considered that there is no significant difference in color between the two points.

[0055] In the present invention, the method of rolling tobacco shreds with cigarette paper can be conventional in the industry.

[0056] The prepared cigarettes were subjected to combustion measurement and mainstream smoke content analysis. The combustion diagram is shown in Figure 1 .

[0057] In the present application, the burning distance difference is used to evaluate the burning uniformity (black circle width), and the burning distance difference D refers to the difference between the maximum distance Dmax and the shortest distance Dmin of the burning line from the bottom end of the cigarette (the end of the filter section);

[0058] In the present application, 50 cigarettes are assembled, and the average value and the variance of D of the 50 groups are used to evaluate the uniformity of the standard burning line and the process stability.

[0059] The test results of each case are shown in Table 1:

[0060]

[0061] As shown in Table 1, the joint control of the method and the parameters of the present application can achieve synergy, can improve the dyeing color difference, improve the burning uniformity and the burning process stability, and in addition, can also help to control the harmful components of the burning mainstream smoke.

Claims

1. A method for preparing colored cigarette paper for reducing burning black circles, characterized in that: The cigarette base paper is pressed into threads, coated with a modified dyeing liquid, and then dried and cut to obtain the cigarette base paper; The thread strength of the stamping is 2-10%; The modified dyeing liquid is added with tobacco pigment and organic acid potassium additive; The thread is a transverse thread; In the modified dyeing liquid, the organic acid potassium auxiliary agent is at least one of potassium citrate and potassium malate; and the concentration of the organic acid potassium auxiliary agent is 1-5 wt‰.

2. The method for preparing colored cigarette paper for reducing combustion black circles according to claim 1, characterized in that: The thread strength is 4~8%.

3. The method for preparing colored cigarette paper for reducing combustion black circles according to claim 1, characterized in that: In the modified dyeing solution, the concentration of the organic acid potassium auxiliary agent is 3-5 wt‰.

4. The method for preparing colored cigarette paper for reducing combustion black circles according to claim 1, wherein: In the modified dyeing liquid, the tobacco pigment is tobacco extract or other natural extracts.

5. The method for preparing colored cigarette paper for reducing combustion black circles according to claim 1, wherein: In the modified dyeing liquid, the weight content of tobacco pigment is 30-50 wt‰.

6. A colored cigarette paper with reduced combustion black circles, prepared by the preparation method according to any one of claims 1 to 5.

7. An application of colored cigarette paper for reducing combustion black circles prepared by the preparation method according to any one of claims 1 to 5, characterized in that: It is used as cigarette paper to prepare burning cigarettes.

8. The use according to claim 7, characterized in that The colored cigarette paper is used to roll the tobacco shreds to obtain the burning section of the burning cigarette.

9. The use according to claim 8, characterized in that Taking the length direction of the burning cigarette as a reference, the thread of the colored cigarette paper is a horizontal thread.

10. A burning rod for colored burning cigarettes capable of reducing burning black circles, comprising a tobacco rod and colored cigarette paper wrapped on the surface thereof, characterized in that: The colored cigarette paper is prepared by the method according to any one of claims 1 to 5, and the threads of the colored cigarette paper are transverse threads relative to the length direction of the burner rod.

11. A colored combustion cigarette capable of reducing combustion black rings, comprising a combustion rod, a filter rod, and a tipping paper splicing the combustion rod and the filter rod, characterized in that: The combustion rod is the combustion rod according to claim 10.

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