Heat-not-burn cigarette paper and preparation method thereof, heat-not-burn cigarette and heat-not-burn system

Abstract

The present application provides a heat-not-burn cigarette paper and a preparation method thereof, a heat-not-burn cigarette and a heat-not-burn system. The raw materials of the heat-not-burn cigarette paper include: 30%-65% fiber, 5%-20% adhesive and 30%-60% flame retardant. The preparation method of the heat-not-burn cigarette paper includes: mixing the raw materials, shearing to obtain a slurry, and then salivating and drying to obtain the heat-not-burn cigarette paper; or, mixing the adhesive, the flame retardant and water to obtain a mixed liquid, and then spraying the mixed liquid on a fiber substrate formed by the fibers, and drying to obtain the heat-not-burn cigarette paper. The heat-not-burn cigarette includes the heat-not-burn cigarette paper and a tobacco core material accommodated in the accommodation space formed by the heat-not-burn cigarette paper. The heat-not-burn system includes the heat-not-burn cigarette. The heat-not-burn cigarette paper provided by the present application has good flame retardancy, thermal conductivity and air permeability.

Description

Technical Field

[0001] The present application relates to the field of heat-not-burn tobacco, and in particular to a heat-not-burn cigarette paper and a preparation method thereof, a heat-not-burn cigarette and a heat-not-burn system. Background Art

[0002] In recent years, with economic development and improved living standards, people have become increasingly concerned about health issues, driving the research and development of new tobacco products (primarily heat-not-burn cigarettes, e-cigarettes, and snus). Furthermore, with the acceleration of the global tobacco control movement in recent years, the tobacco industry has entered a new era of seeking change and breakthroughs, which has in turn accelerated the development of new tobacco products. Heat-not-burn cigarettes (hereinafter referred to as HNB cigarettes) are an important component of new tobacco products. Their characteristics are: first, they are heated at low temperatures without burning; second, they provide nicotine to meet the physiological needs of smokers; and third, they are free of harmful substances such as tar, reducing harmful substances by over 90% compared to existing cigarette ingredients. HNB cigarettes require specialized heating equipment for heating. Currently, there are two main types of electric heating structures popular in the market: the first is a central heating structure and the second is a circumferential heating structure.

[0003] The central heating heating element uses a heating plate (needle) installed at the bottom center of the cigarette holder of the smoking device. When the heat-not-burn cigarette is inserted into the holder, the heating plate (needle) is inserted into the inside of the cigarette. The heating plate (needle) is in direct contact with the special tobacco. The advantage is that the temperature rises quickly and the taste is close to that of real cigarettes. However, it has obvious disadvantages: (1) The heating is uneven. The part of the tobacco in the center that contacts the heating plate (needle) is high due to direct contact with the heating plate (needle), while the temperature around it is low. When the temperature is too high, the taste has a burnt smell, affecting the user experience. (2) The central part of the tobacco is easily carbonized due to direct contact with the heating plate (needle). In addition, the tar in the tobacco solidifies due to heat. The carbonized tobacco will adhere to the heating plate (needle). If it is not cleaned, the next time it is used, there will be a cross-flavor, affecting the senses. Therefore, the smoking device with a central heating structure needs to be cleaned after each use, which is more troublesome.

[0004] Circumferential heating elements typically consist of three components: an air guide, insulation, and a heating element. Heat is applied to a heat-not-burn cigarette by inserting it into the heating element, creating an inward-heating structure. Because circumferential heating utilizes inward-heating technology, the heating elements are evenly distributed along the inner wall of the device, effectively improving the uneven heating problem seen in centrally heated devices. Furthermore, since the heating elements in circumferential heating do not come into contact with the tobacco core, they effectively avoid the carbonization of the tobacco that can occur in centrally heated devices. However, due to the lack of a close fit between the heating element and the cigarette, and the presence of a layer of cigarette paper between the tobacco and the heating tube, circumferential heating suffers from slow heating and inferior heating effectiveness compared to centrally heated devices. To address this issue and maximize the release of the active ingredients in cigarettes, circumferential heating structures typically require higher heating temperatures (300-350°C). However, the ignition point of conventional cigarette paper is generally around 200°C, making it prone to combustion during heating and producing harmful smoke.

[0005] Most of the currently disclosed circumferentially heated cigarette paper technologies utilize a wet papermaking process. Cigarette paper produced using this method generally has low air permeability, making it difficult to release smoke from the cigarette after it is made. Furthermore, these currently disclosed technologies often employ methods such as surface sizing or compounding with other materials to impart the required flame retardancy and thermal conductivity to the cigarette paper, resulting in a complex manufacturing process. For example, the cigarette paper prepared in patent CN105040530A requires compounding with a metal foil; the cigarette paper prepared in patent CN109680540A requires surface sizing after papermaking; and the cigarette paper prepared in patent CN104195887A requires surface application of a flame retardant after papermaking.

[0006] Therefore, in order to solve the problems of low air permeability and complicated production process of cigarette paper prepared by the existing technology, it is necessary to invent a new type of cigarette paper with simple production process, high air permeability and good flame retardancy and thermal conductivity. Summary of the Invention

[0007] The purpose of this application is to provide a heat-not-burn cigarette paper and a preparation method thereof, a heat-not-burn cigarette and a heat-not-burn system to solve the above-mentioned problems.

[0008] To achieve the above objectives, this application adopts the following technical solutions:

[0009] A heat-not-burn cigarette paper, the raw materials of which, calculated by mass percentage, include:

[0010] Fiber 30%-65%, adhesive 5%-20% and flame retardant 30%-60%;

[0011] The flame retardant includes a water-soluble inorganic salt.

[0012] Preferably, the fiber is sourced from one or more of fluff pulp, softwood, and hardwood.

[0013] Preferably, the adhesive comprises one or more of sodium carboxymethyl cellulose, chitosan, guar gum, and starch gum.

[0014] Preferably, the inorganic salt includes one or more of sodium chloride, calcium chloride, disodium hydrogen phosphate, and potassium carbonate.

[0015] Preferably, the basis weight of the heat-not-burn cigarette paper is 40-100 g / m 2 , bulk thickness is 1.00-3.50cm 3 / g, tensile strength is 0.3-2.0kN / m, and air permeability is 200-400mL / min.

[0016] The present application also provides a method for preparing the heat-not-burn cigarette paper, comprising:

[0017] The raw materials are mixed and sheared to obtain a slurry, and then salivated and dried to obtain the heat-not-burn cigarette paper;

[0018] The present application also provides a method for preparing the heat-not-burn cigarette paper, comprising:

[0019] The adhesive, the flame retardant and water are mixed to obtain a mixed liquid, and then the mixed liquid is sprayed on the fiber substrate formed by the fibers, and dried to obtain the heat-not-burn cigarette paper.

[0020] The present application also provides a heat-not-burn cigarette, comprising the heat-not-burn cigarette paper and a tobacco core material accommodated in a receiving space formed by the heat-not-burn cigarette paper.

[0021] Preferably, the cigarette core material includes one or more of nicotine, food flavoring and smoking agent;

[0022] Preferably, the tobacco core material comprises one or more of ordered filamentous material, disordered filamentous material and granular material.

[0023] The present application also provides a heat-not-burn system, comprising the heat-not-burn cigarette.

[0024] Compared with the prior art, the advantages of this application include:

[0025] The heat-not-burn cigarette paper provided in the present application uses a water-soluble inorganic salt as a flame retardant by combining fibers, adhesives and flame retardants, so that the flame retardant can be more evenly dispersed in the cigarette paper, thereby improving the overall flame retardant performance of the cigarette paper; the heat-not-burn cigarette paper has good air permeability and thermal conductivity, so that the tobacco in the cigarette is heated faster and more evenly, and the smoke can be better released.

[0026] The preparation method of the heat-not-burn cigarette paper provided in the present application can be formed in one step without the need for subsequent surface gluing or compounding with other materials, and the production process is simple.

[0027] The heat-not-burn cigarettes and heat-not-burn systems provided in this application heat tobacco faster, heat more evenly, and provide a good smoking experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0029] Figure 1 This is a photo of the heat-not-burn cigarette paper obtained in Example 1;

[0030] Figure 2 These are pictures of the flame retardancy test of the cigarette papers of Examples 1-6 and Comparative Example 1. DETAILED DESCRIPTION

[0031] As used herein:

[0032] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0033] The conjunction "consisting of" excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim, rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0034] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed alone. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0035] In these examples, parts and percentages are by mass unless otherwise indicated.

[0036] "Parts by mass" refers to the basic unit of measurement used to express the mass ratio of multiple components. One part can represent any unit of mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, this means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, we could say that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number representing a multiplication factor). It's important to note that, unlike parts by mass, the sum of the mass of all components is not limited to 100 parts.

[0037] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0038] A heat-not-burn cigarette paper, the raw materials of which, calculated by mass percentage, include:

[0039] Fiber 30%-65%, adhesive 5%-20% and flame retardant 30%-60%;

[0040] The flame retardant includes a water-soluble inorganic salt.

[0041] Optionally, in the raw materials of the heat-not-burn cigarette paper, calculated by mass percentage, the amount of fiber used can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65% or any value between 30% and 65%, the amount of adhesive used can be 5%, 10%, 15%, 20% or any value between 5% and 20%, and the amount of flame retardant used can be 30%, 35%, 40%, 45%, 50%, 55%, 60% or any value between 30% and 60%.

[0042] In an optional embodiment, the fiber is sourced from one or more of fluff pulp, softwood, and hardwood.

[0043] In an optional embodiment, the adhesive includes one or more of sodium carboxymethyl cellulose, chitosan, guar gum, and starch gum.

[0044] In an optional embodiment, the inorganic salt includes one or more of sodium chloride, calcium chloride, disodium hydrogen phosphate, and potassium carbonate.

[0045] In an optional embodiment, the basis weight of the heat-not-burn cigarette paper is 40-100 g / m 2 , bulk thickness is 1.00-3.50cm 3 / g, tensile strength is 0.3-2.0kN / m, and air permeability is 200-400mL / min.

[0046] Optionally, the basis weight of the heat-not-burn cigarette paper may be 40 g / m 2 , 50g / m 2 , 60g / m 2 , 70g / m 2 , 80g / m 2 , 90g / m 2 , 100g / m 2 or 40-100g / m 2 Any value between, the bulk can be 1cm 3 / g, 1.5cm 3 / g, 2cm 3 / g, 2.5cm 3 / g, 3cm 3 / g, 3.5cm 3 / g or 1.00-3.50cm 3 / g, the tensile strength can be 0.3kN / m, 0.5kN / m, 1.0kN / m, 1.5kN / m, 2.0kN / m or any value between 0.3-2.0kN / m, and the air permeability can be 200mL / min, 250mL / min, 300mL / min, 350mL / min, 400mL / min or any value between 200-400mL / min.

[0047] The present application also provides a method for preparing the heat-not-burn cigarette paper, comprising:

[0048] The raw materials are mixed and sheared to obtain a slurry, and then salivated and dried to obtain the heat-not-burn cigarette paper;

[0049] The present application also provides a method for preparing the heat-not-burn cigarette paper, comprising:

[0050] The adhesive, the flame retardant and water are mixed to obtain a mixed liquid, and then the mixed liquid is sprayed on the fiber substrate formed by the fibers, and dried to obtain the heat-not-burn cigarette paper.

[0051] The present application also provides a heat-not-burn cigarette, comprising the heat-not-burn cigarette paper and a tobacco core material accommodated in a receiving space formed by the heat-not-burn cigarette paper.

[0052] In an optional embodiment, the tobacco core material includes one or more of nicotine, food flavoring and smoking agent;

[0053] In an optional embodiment, the tobacco core material includes one or more of ordered filamentous materials, disordered filamentous materials and granular materials.

[0054] The present application also provides a heat-not-burn system, comprising the heat-not-burn cigarette.

[0055] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, the conditions are carried out according to conventional conditions or manufacturer recommendations. The reagents or instruments used are not specified by the manufacturer and are conventional products that can be purchased commercially.

[0056] Example 1

[0057] This embodiment provides a novel heat-not-burn cigarette paper, which has the following components in the following weight ratios: 35% fiber, 15% adhesive, and 50% flame retardant.

[0058] The fibers of the cigarette paper are composed of softwood and hardwood, and the weight ratio of the softwood to the hardwood is 4:1.

[0059] The flame retardant of the cigarette paper is sodium chloride.

[0060] The adhesive of the cigarette paper is sodium carboxymethyl cellulose.

[0061] The specific implementation process is as follows:

[0062] 1) 28 kg of softwood and 7 kg of hardwood were pulped and refined to obtain wood pulp;

[0063] 2) Mixing and shearing wood pulp, 15 kg of sodium carboxymethyl cellulose, and 50 kg of sodium chloride in a mixing tank to obtain a homogenized slurry;

[0064] 3) The homogenized slurry is formed into a uniform and continuous web on a steel belt by salivation. After drying and peeling, the cigarette paper of Example 1 is obtained. The appearance of the cigarette paper is shown in the following photo. Figure 1 shown.

[0065] The cigarette paper of Example 1 has a basis weight of 60-100 g / m 2 , bulk thickness is 1.22-1.28cm 3 / g, and the tensile strength is 1.7kN / m.

[0066] Example 2

[0067] This embodiment provides a novel heat-not-burn cigarette paper, which has the following components in the following weight ratios: 45.5% fiber, 19.5% adhesive, and 35% flame retardant.

[0068] The fibers of cigarette paper are composed of coniferous wood and hardwood wood, with the weight ratio of coniferous wood to hardwood wood being 4:1.

[0069] The flame retardant in cigarette paper is sodium chloride.

[0070] The adhesive of cigarette paper is sodium carboxymethyl cellulose.

[0071] The specific implementation process is as follows:

[0072] 1) 36.4 kg of softwood and 9.1 kg of hardwood were pulped and refined to obtain wood pulp;

[0073] 2) mixing and shearing wood pulp, 19.5 kg of sodium carboxymethyl cellulose, and 35 kg of sodium chloride in a mixing tank to obtain a homogenized slurry;

[0074] 3) The homogenized slurry is formed into a uniform and continuous web on a steel belt by salivation, and the web is dried, peeled, and other steps to obtain the cigarette paper of Example 2.

[0075] The cigarette paper of Example 2 has a basis weight of 80-110 g / m 2 , bulk thickness is 1.15-1.18cm 3 / g, and the tensile strength is 1.8kN / m.

[0076] Example 3

[0077] This embodiment provides a novel heat-not-burn cigarette paper, which has the following components in the following weight ratio: 37% fiber, 13% adhesive, and 50% flame retardant.

[0078] The fibers of cigarette paper are composed of coniferous wood and hardwood wood, with the weight ratio of coniferous wood to hardwood wood being 4:1.

[0079] The flame retardant in cigarette paper is sodium chloride.

[0080] The adhesive of cigarette paper is guar gum.

[0081] The specific implementation process is as follows:

[0082] 1) 29.6 kg of softwood and 7.4 kg of hardwood were pulped and refined to obtain wood pulp;

[0083] 2) mixing and shearing wood pulp, 13 kg guar gum, and 50 kg sodium chloride in a mixing tank to obtain a homogenized slurry;

[0084] 3) The homogenized slurry is formed into a uniform and continuous web on a steel belt by salivation, and after drying, peeling and other steps, the cigarette paper of Example 3 is obtained.

[0085] The cigarette paper of Example 3 has a basis weight of 75-115 g / m 2 , bulk thickness is 1.09-1.31cm 3 / g, and the tensile strength is 1.2kN / m.

[0086] Example 4

[0087] This embodiment provides a novel heat-not-burn cigarette paper, which has the following components in the following weight ratios: 36% fiber, 10% adhesive, and 54% flame retardant.

[0088] The fibers of cigarette paper are composed of fluff pulp.

[0089] The flame retardant in cigarette paper is disodium hydrogen phosphate.

[0090] The adhesive of cigarette paper is guar gum.

[0091] The specific implementation process is as follows:

[0092] 1) 36kg fluff pulp is evenly spread on the forming net after defiberization;

[0093] 2) 10 kg guar gum, 60 kg disodium hydrogen phosphate, and water were prepared into a slurry in a mixing tank;

[0094] 3) The slurry is evenly sprayed on the fiber substrate by spraying, and the cigarette paper of Example 4 is obtained after a drying step.

[0095] The basis weight of the cigarette paper in Example 4 is 50-70 g / m 2 , bulk thickness is 2.77-2.85cm 3 / g, and the tensile strength is 0.7kN / m.

[0096] Example 5

[0097] This embodiment provides a novel heat-not-burn cigarette paper, which has the following components in the following weight ratios: 36% fiber, 10% adhesive, and 54% flame retardant.

[0098] The fibers of cigarette paper are composed of fluff pulp.

[0099] The flame retardant in cigarette paper is sodium chloride.

[0100] The adhesive of cigarette paper is guar gum.

[0101] The specific implementation process is as follows:

[0102] 1) 36kg fluff pulp is evenly spread on the forming net after defiberization;

[0103] 2) 10 kg guar gum, 60 kg sodium chloride, and water were prepared into a slurry in a mixing tank;

[0104] 3) The slurry is evenly sprayed on the fiber substrate by spraying, and the cigarette paper of Example 5 is obtained after a drying step.

[0105] The basis weight of the cigarette paper in Example 5 is 50-70 g / m 2 , bulk thickness is 2.89-3.02cm 3 / g, and the tensile strength is 0.6kN / m.

[0106] Example 6

[0107] This embodiment provides a novel heat-not-burn cigarette paper, which has the following components in the following weight ratios: 36% fiber, 10% adhesive, and 54% flame retardant.

[0108] The fibers of cigarette paper are composed of fluff pulp.

[0109] The flame retardant in cigarette paper is sodium chloride.

[0110] The adhesive of cigarette paper is sodium carboxymethyl cellulose.

[0111] The specific implementation process is as follows:

[0112] 1) 36kg fluff pulp is evenly spread on the forming net after defiberization;

[0113] 2) 10 kg of sodium carboxymethyl cellulose, 60 kg of sodium chloride, and water are prepared into a slurry in a mixing tank;

[0114] 3) The slurry is evenly sprayed on the fiber substrate by spraying, and the cigarette paper of Example 6 is obtained after a drying step.

[0115] The basis weight of the cigarette paper in Example 6 is 50-70 g / m 2, bulk thickness is 3.11-3.28cm 3 / g, and the tensile strength is 0.4kN / m.

[0116] Comparative Example 1

[0117] Traditional cigarettes were used as controls.

[0118] The main components of traditional cigarette paper are wood pulp, inorganic fillers, combustion aids and other ingredients, and are generally prepared through conventional papermaking processes.

[0119] Comparative Example 2

[0120] The paper is prepared by traditional papermaking process using 65% fiber, 10% calcium carbonate, 5% guar gum and 20% zinc borate.

[0121] Cigarette paper basis weight is 50-70g / m 2 , bulk thickness is 2.47-2.58cm 3 / g, and the tensile strength is 0.5kN / m.

[0122] 1. Flame retardant test

[0123] Several test strips 20 cm long and 1 cm wide were cut from each of Examples 1-6 and conventional cigarette paper. The test strips were ignited with an alcohol burner (the first 5 cm of the test strips were used for ignition). When the flame reached 5 cm, the open flame on the test strips was extinguished (the test strips were now in a smoldering state). The smoldering time and length on the test strips were recorded to test the flame retardancy of each experimental example and conventional cigarette paper. The test results are shown in Tables 1 and 2. Figure 2 (Comparative Example 1 and Examples 1 to 6 from top to bottom) are shown as follows:

[0124] Table 1 Test results of flame retardant test

[0125] Average smoldering length (cm) Average smoldering time (s) Comparative Example 1 8.1 41.7 Comparative Example 2 6.5 24.4s Example 1 0.3 1.6 Example 2 0.6 2.7 Example 3 0.4 2.2 Example 4 3.0 14.1 Example 5 4.2 15.8 Example 6 3.4 18.2

[0126] It can be seen from the experimental results in Table 1 that the cigarette paper prepared using the cigarette paper formula of the present invention has better flame retardant effect than traditional cigarette paper, among which Example 1 has the best flame retardant effect.

[0127] 2. Cigarette paper suitability test:

[0128] Because different heat-not-burn cigarettes use different core materials, they place varying demands on the flame retardancy of cigarette paper. Therefore, a cigarette paper applicability test was designed to test the flame retardancy of cigarette paper prepared using the cigarette paper formula described herein after being rolled into various core materials, thereby assessing the applicability of the cigarette paper described herein to different core materials.

[0129] The above Examples 1-6 and conventional cigarette paper were respectively rolled / filled with conventional shredded tobacco (ordered), material containing 30% smoke-generating agent (random), a core material containing flavoring (random), and tobacco particles to form cigarette sticks. The cigarette sticks were 94 mm long (including a 34 mm filter length). The different cigarette sticks were ignited (the first 5 mm) and flame retardancy tests were conducted. The test results are as follows:

[0130] Table 2 Flame retardancy test results of different cigarettes

[0131]

[0132] The test results in Table 2 indicate that the cigarette paper prepared using the cigarette paper formulation of the present invention exhibits good flame retardant effects when rolled or filled into cigarettes with various types and forms of core materials. This indicates that the cigarette paper prepared using the cigarette paper formulation of the present invention is suitable for rolling or filling cigarettes with most conventional core materials, provides corresponding flame retardant effects, and has a wide range of applications.

[0133] 3. Combustion performance of cigarette paper in heat-not-burn smoking devices:

[0134] Cigarettes were made using conventional cigarette paper and the cigarette paper prepared in Examples 1-6. The combustion performance of the conventional cigarette paper and the cigarette paper prepared using the cigarette paper formulation of the present invention were tested and compared by heating them at different temperatures using a circumferentially structured smoking device. The test results are as follows:

[0135] Table 3 Test results of cigarette paper combustion performance

[0136]

[0137] From the test results in Table 3, it can be seen that the cigarette paper prepared using the cigarette paper formula of the present invention does not cause combustion at 500°C. The use of the cigarette paper of the present invention can allow cigarettes to reach a higher heating temperature, allowing substances in the cigarette to be better released.

[0138] 4. Cigarette paper air permeability test

[0139] Air permeability measures the amount of air that passes through a given area of ​​paper under a certain vacuum level per minute, or the time it takes for a given amount of air to pass through. Using an air permeability tester, the air permeabilities of conventional cigarette paper and the cigarette papers prepared in Examples 1-6 were measured over the same test area. The results are as follows:

[0140] Table 4 Test results of cigarette paper air permeability

[0141] project Air permeability (ml / min) Traditional cigarette paper 112 Example 1 197 Example 2 184 Example 3 189 Example 4 289 Example 5 298 Example 6 338

[0142] From the test results in Table 4, it can be seen that the cigarette paper prepared using the cigarette paper formula of the present invention has better air permeability, which allows the cigarette to be heated more fully and evenly during heating, and at the same time allows the smoke generated by the cigarette to be better released. Among them, Experimental Example 6 has the best air permeability.

[0143] 5. Cigarette paper thermal conductivity test

[0144] Thermal conductivity refers to the amount of heat transferred through a one-square-meter area over a given period of time under stable heat transfer conditions, with a temperature difference of one degree K (°C) between the two surfaces of a one-meter-thick material. The unit is watts per meter-degree Celsius. The thermal conductivity of conventional cigarette paper and the cigarette paper prepared in Examples 1-6 was measured using a thermal constant tester. The results are as follows:

[0145] Table 5 Test results of thermal conductivity of cigarette paper

[0146] project Thermal conductivity (W / m·K) Traditional cigarette paper 0.06 Example 1 0.11 Example 2 0.08 Example 3 0.1 Example 4 0.1 Example 5 0.09 Example 6 0.08

[0147] The test results in Table 5 show that, with the exception of Example 5, the thermal conductivity of the cigarette paper prepared in all other examples is higher than that of conventional cigarette paper, indicating that the cigarette paper prepared using the cigarette paper formulation of the present invention can enhance the thermal conductivity of cigarettes, allowing tobacco to heat faster and more fully. Among them, Example 1 has the best thermal conductivity.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0149] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and to form distinct embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is intended solely to enhance understanding of the overall background of this application and should not be construed as an admission or any implication that such information constitutes prior art known to those skilled in the art.

Claims

1. A heat-not-burn cigarette paper, characterized in that: The raw materials are calculated by mass percentage and include: 30%-65% fiber, 5%-20% adhesive and 30%-60% flame retardant; the flame retardant includes a water-soluble inorganic salt, wherein the inorganic salt includes one or more of sodium chloride, calcium chloride, disodium hydrogen phosphate, and potassium carbonate; and the bulk thickness of the heat-not-burn cigarette paper is 1.00-3.50 cm 3 / g, the heat-not-burn cigarette paper is prepared by the following method: The raw materials are mixed and sheared to obtain a homogenized slurry, and the homogenized slurry is then formed into a uniform and continuous web on a steel belt by salivation, and the heat-not-burn cigarette paper is obtained after drying and peeling; or The fibers are defibrated and evenly laid on a forming net, the adhesive, the flame retardant and water are mixed to obtain a mixed liquid, and the mixed liquid is then sprayed on a fiber substrate formed by the fibers, and dried to obtain the heat-not-burn cigarette paper.

2. The heat-not-burn cigarette paper according to claim 1, characterized in that: The fiber may be sourced from one or more of fluff pulp, softwood, and hardwood.

3. The heat-not-burn cigarette paper according to claim 1, characterized in that: The adhesive includes one or more of sodium carboxymethyl cellulose, chitosan, guar gum, and starch glue.

4. The heat-not-burn cigarette paper according to any one of claims 1 to 3, characterized in that: The basis weight of the heat-not-burn cigarette paper is 40-100 g / m 2 , the tensile strength is 0.3-2.0kN / m.

5. A heat-not-burn cigarette, characterized in that: The invention comprises the heat-not-burn cigarette paper according to any one of claims 1 to 4 and a tobacco core material accommodated in an accommodation space formed by the heat-not-burn cigarette paper.

6. The heat-not-burn cigarette according to claim 5, characterized in that: The cigarette core material includes one or more of nicotine, food flavoring and smoke generating agent.

7. The heat-not-burn cigarette according to claim 5, characterized in that: The cigarette core material includes one or more of orderly arranged filamentous materials, disorderly arranged filamentous materials and granular materials.

8. A heating without burning system, characterized in that: The heat-not-burn cigarette comprises the heat-not-burn cigarette according to any one of claims 5 to 7.

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