Cigarette paper and a heat-not-burn cigarette

Abstract

The utility model provides a kind of cigarette paper and heating cigarette, belong to tobacco product technical field.The cigarette paper includes paper base layer, isolation layer and anti-permeation layer;Anti-permeation layer is set on the surface of isolation layer, for preventing the soluble substance in tobacco product permeating into paper base layer, and anti-permeation layer is formed by in situ polymerization of polymer monomer on the surface of isolation layer;Isolation layer is set on the surface of paper base layer, for isolating paper base layer and polymer monomer, to prevent polymer monomer from entering the aperture of paper base layer.

Description

Technical Field

[0001] This utility model relates to the field of tobacco product technology, and in particular to a cigarette paper and a heated cigarette. Background Technology

[0002] Heated tobacco products have garnered significant attention due to their sensory quality and smoking method being closest to traditional cigarettes. Because of the different usage methods, traditional cigarettes and heated cigarettes differ in their auxiliary materials, one of which is the cigarette paper. The production formula of cigarette paper used in traditional cigarettes mainly includes four categories of substances: natural fibers, fillers, combustion aids, and additives. These four categories are essential in the production of traditional cigarette paper. However, in low-temperature cigarettes, the cigarette does not need to burn, so there is no requirement for the combustion aid content in the cigarette paper, nor is the air permeability requirement high. On the other hand, heated cigarette tobacco generally uses a large amount of glycerol, which is highly hygroscopic, increasing the moisture content of the tobacco. Soluble substances in the tobacco easily transfer to the cigarette paper, causing spots and affecting the appearance quality of the cigarette. It also reduces the opacity of the cigarette paper. Opacity is one of the key quality indicators of cigarette paper. The opacity of the cigarette paper not only ensures product uniformity and quality but also affects the burning speed, taste, and consumer experience of the cigarette. According to relevant regulations, the opacity of Grade A products should not be less than 73%.

[0003] Therefore, cigarette paper needs to incorporate new anti-permeability features. In related technologies, aluminum composite paper is commonly used in heated cigarettes. Aluminum is coated onto a paper base using electroplating or transfer methods to form the cigarette paper. Aluminum composite paper has significant drawbacks: its manufacturing process is complex and costly; aluminum cannot be recycled, causing environmental pollution. Furthermore, due to the introduction of metal, heated cigarettes produced using this type of paper cannot be detected using microwave equipment.

[0004] Therefore, there is an urgent need to develop a type of cigarette paper that is highly opaque, has good anti-permeability properties, is low in cost, and is environmentally friendly. Utility Model Content

[0005] In view of this, in order to at least partially solve at least one of the aforementioned technical problems, the present invention provides cigarette paper and heated cigarettes.

[0006] According to one aspect of the present invention, a cigarette paper for heating cigarettes is provided, the cigarette paper comprising a base layer, an insulating layer, and an anti-permeability layer; the anti-permeability layer is disposed on the surface of the insulating layer to prevent soluble substances in tobacco products from permeating into the base layer, the anti-permeability layer being formed by in-situ polymerization of polymer monomers on the surface of the insulating layer; the insulating layer is disposed on the surface of the base layer to isolate the base layer and the polymer monomers, preventing the polymer monomers from entering the pores of the base layer.

[0007] According to an embodiment of this utility model, the aforementioned paper base layer is a white paper base layer; the content of white filler in the aforementioned paper base layer is 5.0wt%~35.0wt%; the basis weight of the aforementioned paper base layer is 25~60g / m³. 2 .

[0008] According to an embodiment of the present invention, the isolation layer comprises at least one of polyvinyl butyral and polyvinyl alcohol.

[0009] According to embodiments of the present invention, the polymer monomers include at least one of amino silicone oil and vinyl silicone oil.

[0010] According to an embodiment of the present invention, the temperature for the above-mentioned in-situ polymerization is 80~180℃.

[0011] According to an embodiment of the present invention, the paper base layer includes chitosan particles, which decompose when the heating element heats the cigarette paper to form micron-sized pores.

[0012] According to an embodiment of the present invention, the particle size of the chitosan particles is 0.5~5μm.

[0013] According to an embodiment of the present invention, the mass content of the chitosan particles in the paper substrate is 1% to 10%.

[0014] According to an embodiment of the present invention, the opacity of the cigarette paper is above 73%.

[0015] According to an embodiment of this utility model, the unit area mass of the above-mentioned isolation layer is 0.2~5.0 g / m². 2 .

[0016] According to embodiments of this invention, the above-mentioned impermeable layer has a unit area mass of 0.2~5.0 g / m² based on silicon. 2 .

[0017] According to another embodiment of the present invention, a heated cigarette is provided, comprising cigarette paper, the cigarette paper comprising a paper base layer, an insulating layer, and an anti-permeability layer; the anti-permeability layer is disposed on the surface of the insulating layer to prevent soluble substances in tobacco products from permeating into the paper base layer, the anti-permeability layer being formed by in-situ polymerization of polymer monomers on the surface of the insulating layer; the insulating layer is disposed on the surface of the paper base layer to isolate the paper base layer and the polymer monomers, preventing some or all of the polymer monomers from entering the pores of the paper base layer.

[0018] The cigarette paper for heated cigarettes provided in this embodiment includes a paper base layer, an isolation layer, and an anti-permeability layer stacked sequentially. The anti-permeability layer prevents soluble substances in tobacco products from penetrating into the paper base layer, avoiding spot formation and ensuring the appearance quality of the cigarette paper. Forming the anti-permeability layer by in-situ polymerization of polymer monomers on the surface of the isolation layer improves the bonding strength between the isolation layer and the anti-permeability layer and reduces the amount of anti-permeability layer used. The isolation layer separates the paper base layer from the polymer monomers, preventing the polymer monomers from entering the pores of the paper base layer and avoiding the influence of the polymer monomers on the opacity of the paper base layer. The cigarette paper provided in this embodiment has advantages such as high opacity, good anti-permeability performance, low cost, and environmental friendliness. Furthermore, since the cigarette paper for heated cigarettes provided in this embodiment does not contain metal, the quality of the heated cigarettes can be detected online using microwave instruments widely used in traditional cigarette manufacturing, eliminating the need to replace the detection equipment, reducing costs, and ensuring the quality of the heated cigarettes. Attached Figure Description

[0019] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of the structure of cigarette paper for heating cigarettes according to an embodiment of the present invention is shown;

[0021] The meanings of the reference numerals in the above figures are as follows:

[0022] 1-Paper base layer;

[0023] 2-Isolation layer;

[0024] 3- Impermeable layer. Detailed Implementation

[0025] The embodiments of the present invention will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0026] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0027] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0028] In the process of developing this invention, it was discovered that the anti-permeability of cigarette paper can be improved by preparing an anti-permeability layer on the surface of the paper base layer. Extensive attempts were made to achieve this, considering the influence of the preparation process, the amount of anti-permeability layer used, and the bonding strength between the anti-permeability layer and the paper base layer. An in-situ polymerization method was attempted to form the anti-permeability layer on the surface of the paper base layer. However, during the experiments, it was found that this method reduced the opacity of the cigarette paper.

[0029] Analysis revealed that this was due to the in-situ polymerization method, which allowed polymer monomers to enter the pores of the paper substrate. Once inside, the monomers displaced the air in the paper pores. Since air absorbs light, the reduced air volume increased the light transmittance through the paper, resulting in increased transparency and decreased opacity. As the paper's opacity decreased, the wrapped tobacco could be seen more vaguely, creating an unpleasant visual effect.

[0030] Based on this, the structure of cigarette paper was further improved by adding an isolation layer between the paper base layer and the anti-permeability layer. This layer isolates the paper base layer from the polymer monomers, preventing some or all of the polymer monomers from entering the pores of the paper base layer and reducing the impact of polymer monomers on the opacity of the cigarette paper.

[0031] Specifically, this utility model provides a cigarette paper for heating cigarettes, such as... Figure 1 As shown, the cigarette paper includes a paper base layer 1, an isolation layer 2, and an anti-permeability layer 3. The anti-permeability layer 3 is disposed on the surface of the isolation layer 2 to prevent soluble substances in tobacco products from permeating into the paper base layer 1. The anti-permeability layer 3 is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer 2. The isolation layer 2 is disposed on the surface of the paper base layer 1 to isolate the paper base layer 1 from the polymer monomers and prevent some or all of the polymer monomers from entering the pores of the paper base layer 1.

[0032] The cigarette paper for heating cigarettes provided in this embodiment includes a paper base layer 1, an isolation layer 2, and an anti-permeability layer 3 stacked sequentially. The anti-permeability layer 3 prevents soluble substances in tobacco products from permeating into the paper base layer 1, avoiding the formation of spots and ensuring the appearance quality of the cigarette paper. The anti-permeability layer 3 is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer 2, which improves the bonding strength between the isolation layer 2 and the anti-permeability layer 3 and reduces the amount of anti-permeability layer 3 used. The isolation layer 2 separates the paper base layer 1 from the polymer monomers, preventing the polymer monomers from entering the pores of the paper base layer 1 and avoiding the influence of the polymer monomers on the opacity of the paper base layer 1. The cigarette paper provided in this embodiment has advantages such as high opacity, good anti-permeability performance, low cost, and environmental friendliness.

[0033] Furthermore, since the cigarette paper for heating cigarettes provided in this embodiment does not contain metal, the quality of the heated cigarettes can be detected online using microwave instruments widely used in traditional cigarette manufacturing. This eliminates the need to replace the testing equipment, reduces costs, and ensures the quality of the heated cigarettes.

[0034] It should be noted that the isolation layer 2 prevents some polymer monomers from entering the pores of the paper base layer 1. At this point, a small amount of polymer monomers can pass through the isolation layer 2 into the paper base layer 1 and bind with the fibers. After in-situ polymerization, this can improve the bonding strength between the paper base layer 1, the isolation layer 2, and the anti-permeability layer 3. The small amount of polymer monomers has little impact on the opacity of the paper base layer 1 and may not require treatment. Alternatively, the opacity of the paper base layer 1 can be further improved by increasing the content of white filler in the paper base layer 1. The amount of polymer monomers entering the paper base layer 1 can be controlled by the thickness and material of the isolation layer 2. The isolation layer 2 also prevents all polymer monomers from entering the pores of the paper base layer 1, thereby avoiding the influence of polymer monomers on the opacity of the paper base layer 1.

[0035] According to an embodiment of this utility model, the paper base layer 1 is a white paper base layer. The white paper base layer can be produced from white pulp. This utility model does not limit the selection of white pulp; those skilled in the art can conventionally select white pulp according to actual needs. For example, the white pulp can be existing commercial pulp. White filler can be added to the pulp. The content of white filler in the white paper base layer can be 5.0 wt% to 35.0 wt%, optionally, the content of white filler can be 10.0 wt% to 30.0 wt%. Exemplarily, the content of white filler can be 5.0 wt%, 6.0 wt%, 7.0 wt%, 8.0 wt%, 9.0 wt%, 10.0 wt%, 11.0 wt%, 12.0 wt%, 13.0 wt%, 14.0 wt%, 15.0 wt%, 18.0 wt%, 20.0 wt%, 22.0 wt%, 25.0 wt%, 28.0 wt%, 30.0 wt%, 32.0 wt%, 35.0 wt%, or a range consisting of any two of the above values. This invention does not limit the selection of white filler; those skilled in the art can choose white filler conventionally according to actual needs. For example, the white filler can be calcium carbonate. The calcium carbonate content in the white paper base layer can be 5.0 wt% to 35.0 wt%. The purpose of using white pulp and white filler is to make the finished paper white and to provide a certain degree of opacity.

[0036] According to embodiments of this invention, the basis weight of the white paper base can be 25~60 g / m³. 2 Optionally, the basis weight of the white paper base can be 30~50 g / m³. 2 For example, the basis weight of the white paper base can be 25 g / m³. 2 28g / m 2 30g / m 2 32g / m 2 35g / m 2 38g / m 2 40g / m 2 45g / m 2 50g / m 2 55g / m 2 60g / m 2 Or it can be a range consisting of any two of the above values. A suitable basis weight can maintain a certain strength of the paper base layer 1 after the addition of white filler.

[0037] According to an embodiment of this invention, in order to improve the air permeability of cigarette paper during smoking, the paper base layer 1 can include chitosan particles. These chitosan particles decompose when the cigarette is heated by the heating element of the smoking device, forming micron-sized pores on the cigarette paper. The decomposition of chitosan particles first forms micron-sized pores on the paper base layer 1. These pores in the paper base layer 1 then damage the isolation layer 2 and the anti-permeability layer 3, causing them to also form micron-sized pores. The size of these micron-sized pores can be adjusted by controlling the particle size of the chitosan particles.

[0038] It should be noted that the paper base layer 1 includes several chitosan particles. When the heating element heats the heated cigarette, all or part of the chitosan particles may be decomposed to form micron-sized pores on the cigarette paper.

[0039] According to embodiments of this invention, chitosan particles are a high-molecular-weight biodegradable material extracted primarily from chitin, and are insoluble in water. During the papermaking process, chitosan particles can adhere to wood pulp fibers, allowing for effective addition. Chitosan begins to decompose at approximately 200°C, and decomposes rapidly within the range of 250-300°C. During the use of heated cigarettes, the temperature of the heating element in the device is generally around 300°C. At this temperature, the granular chitosan decomposes rapidly, creating micron-sized pores in the cigarette paper, increasing its real-time air permeability. When smoking heated cigarettes, external air can pass through the cigarette paper into the cigarette, resulting in a more uniform air distribution, which is beneficial for the pyrolysis of tobacco products such as tobacco shreds and tobacco sheets, thereby improving the smoking quality.

[0040] According to embodiments of this invention, the chitosan particles have a particle size of 0.5~5μm. Optionally, the particle size of the chitosan particles can be 1~3μm. Exemplarily, the particle size of the chitosan particles can be 0.5μm, 1.0μm, 1.5μm, 2.0μm, 2.5μm, 3.0μm, 3.5μm, 4.0μm, 4.5μm, 5.0μm, or a range consisting of any two of the above values. When the particle size of the chitosan particles is within the above range, the granular chitosan decomposes to create appropriately sized pores on the cigarette paper, ensuring the air permeability of the cigarette paper while avoiding excessively large pores that could damage the cigarette paper.

[0041] According to embodiments of this utility model, the content of chitosan particles in the paper base layer 1 is 1% to 10%, optionally, the content of chitosan particles in the paper base layer 1 can be 4% to 8%. Exemplarily, the content of chitosan particles in the paper base layer 1 can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range consisting of any two of the above values. When the content of chitosan particles is within the above value range, the granular chitosan decomposes to create a suitable number of pores on the cigarette paper, ensuring the air permeability of the cigarette paper while avoiding excessive pores that could damage the cigarette paper.

[0042] According to an embodiment of this invention, the opacity of the cigarette paper is 73% or higher. By ensuring the opacity of the cigarette paper is 73% or higher, the quality of heated cigarettes made from the cigarette paper can be improved.

[0043] According to an embodiment of this utility model, the isolation layer 2 includes at least one of polyvinyl butyral and polyvinyl alcohol. Exemplarily, the isolation layer 2 may include polyvinyl butyral, or it may include polyvinyl alcohol, or it may include both polyvinyl butyral and polyvinyl alcohol. Polyvinyl butyral and polyvinyl alcohol have film-forming properties at room temperature and can form a thin film on the paper substrate surface, simplifying the process.

[0044] According to an embodiment of this utility model, the mass per unit area of ​​the isolation layer 2 can be 0.2~5.0 g / m². 2 Optionally, the mass per unit area of ​​the isolation layer 2 is 0.5~3.0 g / m². 2 For example, the mass per unit area of ​​the isolation layer 2 is 0.2 g / m². 2 0.3g / m 2 0.5g / m 2 0.8g / m 2 1.0g / m 2 1.2g / m 2 1.5g / m 2 2.0g / m 2 2.5g / m 2 3.0g / m 2 3.5g / m 2 4.0g / m 2 4.5g / m 2 5.0g / m 2 Or it can be a range consisting of any two of the above values. When the mass per unit area of ​​the isolation layer 2 is within the above range, it can prevent some or all of the polymer monomers from entering the paper base layer 1, reducing or avoiding the influence of polymer monomers on the opacity of the paper base layer 1.

[0045] It should be noted that the larger the unit area mass of the isolation layer 2, the less polymer monomers enter the paper base layer 1, and the smaller the impact of polymer monomers on the opacity of the paper base layer 1. Conversely, the smaller the unit area mass of the isolation layer 2, the more polymer monomers enter the paper base layer 1, and the greater the impact of polymer monomers on the opacity of the paper base layer 1. When the opacity of the paper base layer 1 cannot meet the quality requirements, it is necessary to adjust the basis weight and / or white filler content of the paper base layer 1 to meet the quality requirements for cigarette paper.

[0046] There are many types of polymers with different forms, including liquid, solid and gel states. Appropriate polymer monomers can be selected according to their properties and process characteristics to form an impermeable layer 3.

[0047] Optionally, the polymer monomer includes at least one of amino silicone oil and vinyl silicone oil. Exemplarily, the polymer monomer may include amino silicone oil, or it may include vinyl silicone oil, or it may include both amino silicone oil and vinyl silicone oil. By forming the impermeable layer 3 through in-situ polymerization on the surface of the insulating layer 2, the impermeability of the cigarette paper can be improved, preventing soluble substances in tobacco products from penetrating into the paper base layer 1 and avoiding the formation of spots. Furthermore, the impermeable layer 3 formed by polymerizing at least one of amino silicone oil and vinyl silicone oil has good temperature resistance, which can improve the high-temperature resistance of the cigarette paper.

[0048] Amino silicone oil and vinyl silicone oil are liquid substances with good uniform dispersion on the substrate. A small portion can penetrate into the paper base layer 1 and bond with the fibers, while the majority bonds with polyvinyl butyral and / or polyvinyl alcohol in the release layer 2. After treatment under high temperature conditions, the bonding strength is further enhanced, forming a stronger, denser, and continuous impermeable layer 3, which is the advantage of in-situ polymerization. If solid or gel-state polymers such as organosilicon resins are used for direct coating, a large amount of adhesive is required for bonding, and the adhesive itself must also be waterproof and impermeable, making it difficult to form a continuous film, and the overall coating amount is also larger.

[0049] Amino silicone oils can spontaneously crosslink at high temperatures, exhibiting film-forming properties; curing agents such as tin acetate can also be added to accelerate their curing. Vinyl silicone oils, on the other hand, lack film-forming properties and require crosslinking agents and catalysts to form a thin film. At room temperature, both amino and vinyl silicone oils remain liquid microscopically, not cured into a solid film; therefore, curing is necessary for optimal anti-permeation performance. Both amino and vinyl silicone oils are commercially available products, and technical personnel can choose the appropriate one based on specific needs.

[0050] It should be noted that the solution containing polymer monomers may also include solvents in addition to amino silicone oil and / or vinyl silicone oil, so as to uniformly coat the amino silicone oil and / or vinyl silicone oil on the surface of the paper base.

[0051] For example, the solution including polymer monomers may further include ethanol, and the volume ratio of amino silicone oil and / or vinyl silicone oil to ethanol may be 1:1 to 1:10. Optionally, the volume ratio of amino silicone oil and / or vinyl silicone oil to ethanol may be 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10 or a range of any two of the above values.

[0052] Furthermore, the solution containing the polymer monomers may also include catalysts, curing agents, crosslinking agents, etc., to polymerize amino silicone oil and / or vinyl silicone oil to form a protective film.

[0053] According to an embodiment of the present invention, the in-situ polymerization temperature is 80~180℃. Optionally, the in-situ polymerization temperature can be 130~160℃. Exemplarily, the in-situ polymerization temperature can be 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, or a range consisting of any two of the above values.

[0054] According to embodiments of this invention, the permeability barrier layer 3, calculated as silicon, has a unit area mass of 0.2~5.0 g / m³. 2 Optionally, the surface area mass of the impermeable layer 3, calculated as silicon, can be 0.5~3.0 g / m². 2 For example, the permeability barrier layer 3 can have a unit area mass of 0.2 g / m² based on silicon. 2 0.5g / m 2 0.8g / m 2 1.0g / m 2 1.5g / m 2 2.0g / m 2 2.5g / m 2 3.0g / m 2 3.5g / m 2 4.0g / m 2 4.5g / m 2 5.0g / m 2 Or it can be a range consisting of any two of the above values. A suitable mass per unit area can give the impermeable layer 3 both impermeability and suitable tear resistance.

[0055] According to another embodiment of the present invention, a method for preparing cigarette paper for heating cigarettes is provided, comprising steps S2 and S3.

[0056] In operation S2, an isolation layer is prepared on the surface of the paper base layer to obtain a composite layer.

[0057] In operation S3, a solution containing polymer monomers is coated on one side of the isolation layer of the composite layer, and the polymer monomers are polymerized in situ to obtain cigarette paper for heating cigarettes.

[0058] The present invention provides a method for preparing cigarette paper that is simple in process, easy to operate, energy-saving and environmentally friendly, and can complete the production of cigarette paper without special equipment, thereby reducing the production cost of cigarette paper.

[0059] According to an embodiment of this utility model, step S1 may be included before step S2. In step S1, a paper base layer is prepared using white pulp. Optionally, calcium carbonate may be added to the pulp, and the calcium carbonate content in the paper base layer is 5.0%~35.0%, optionally 10.0%~30.0%; the basis weight of the paper base may be 25~60 g / m³. 2 Optionally, the concentration is 30~50g / m 2 .

[0060] According to an embodiment of this invention, in operation S2, one or both of the following can be coated onto the prepared paper base surface: a solution containing polyvinyl butyral and a solution containing polyvinyl alcohol, so that the unit area mass of the isolation layer is 0.2~5.0 g / m². 2 Optionally, the concentration is 0.5~3.0 g / m³. 2 Optionally, polyvinyl butyral can be dissolved in ethanol to obtain a solution containing polyvinyl butyral; or polyvinyl alcohol can be dissolved in water to obtain a solution containing polyvinyl alcohol. After coating, it can be dried using conventional methods.

[0061] According to an embodiment of this invention, in step S3, a solution comprising polymer monomers is coated onto one side of the isolation layer of the composite layer. The polymer monomers can be one or both of amino silicone oil and vinyl silicone oil, such that the polymer monomers, after polymerization, have a unit area mass on the isolation layer of 0.2~5.0 g / m² (based on silicon). 2 Optionally, the concentration is 0.5~3.0 g / m³. 2 .

[0062] According to an embodiment of this invention, in step S3, a solution comprising polymer monomers is coated onto one side of the isolation layer of the composite layer and then cured under high temperature conditions. The curing temperature can be 80~180℃, optionally 130~160℃. The curing time is closely related to the temperature; higher temperatures result in shorter curing times, and lower temperatures result in longer curing times. The curing time varies from several seconds to several days. The absence of liquid on the paper base surface indicates that curing has been achieved, and the curing time is not limited here. High-temperature curing can be used to shorten the operation time.

[0063] According to another embodiment of the present invention, a heated cigarette is provided, comprising cigarette paper and a tobacco product wrapped in the cigarette paper. The cigarette paper includes a paper base layer, an insulating layer, and an anti-permeability layer. The anti-permeability layer is disposed on the surface of the insulating layer to prevent soluble substances in the tobacco product from permeating into the paper base layer. The anti-permeability layer is formed by in-situ polymerization of polymer monomers on the surface of the insulating layer. The insulating layer is disposed on the surface of the paper base layer to isolate the paper base layer and the polymer monomers, preventing some or all of the polymer monomers from entering the pores of the paper base layer.

[0064] The embodiments of this utility model do not limit the tobacco products wrapped in cigarette paper, and those skilled in the art can conventionally select tobacco products according to actual needs. For example, the tobacco products wrapped in cigarette paper may include shredded tobacco, tobacco sheets, tobacco granules, etc.

[0065] It should be noted that in heated cigarettes, one side of the anti-permeability layer of the cigarette paper is the inner surface, which is in contact with the tobacco product to prevent soluble substances in the tobacco product from penetrating into the paper base layer.

[0066] The present invention will be described in detail below with reference to the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0067] Detection method:

[0068] Seepage prevention effect test:

[0069] After the cigarette paper provided in each embodiment and comparative example was treated at a temperature of 38°C and a humidity of 80% for 24 hours, it was observed whether the stains and spots on the outer surface of the cigarette paper were visible to the naked eye.

[0070] Opacity detection:

[0071] The opacity of the cigarette paper provided in each embodiment and comparative example was tested in accordance with GB / 1543-2005 Determination of opacity (paper backing) of paper and paperboard (diffuse reflection method).

[0072] Sensory quality evaluation of cigarettes:

[0073] The sensory quality of cigarettes shall be evaluated according to the methods recommended in "Cigarettes Part 2: Sensory Technical Requirements" (GB 5606.2-2005).

[0074] Example 1

[0075] This embodiment provides a cigarette paper, which includes a paper base layer, an isolation layer, and an anti-permeability layer. The anti-permeability layer is disposed on the surface of the isolation layer to prevent soluble substances in tobacco products from permeating into the paper base layer. The anti-permeability layer is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer. The isolation layer is disposed on the surface of the paper base layer to isolate the paper base layer and the polymer monomers and prevent the polymer monomers from entering the pores of the paper base layer.

[0076] This embodiment also provides a method for preparing the cigarette paper, and the relevant process parameters are detailed in Table 1, including the following steps:

[0077] (1) A paper base layer was prepared using white pulp, with calcium carbonate added to the pulp. The calcium carbonate content in the paper base layer was 28.0 wt%, and the basis weight was 38.2 g / m³. 2 No chitosan particles were added.

[0078] (2) An isolation layer is prepared on the surface of the paper base layer to obtain a composite layer. The unit area mass of the isolation layer is 1.5 g / m². 2 The material of the isolation layer is polyvinyl butyral.

[0079] (3) A solution containing polymer monomers is coated on one side of the isolation layer of the composite layer, and the polymer monomers are polymerized in situ to form an impermeable layer on the isolation layer side of the composite layer, thus obtaining cigarette paper for heating cigarettes. The polymer monomer is vinyl silicone oil, and the impermeable layer has a unit area mass of 1.2 g / m² based on silicon. 2 The in-situ polymerization temperature is 130℃.

[0080] Examples 2-9, Comparative Examples 1-11

[0081] Examples 2-9 and Comparative Examples 1-11 provide cigarette paper and its preparation method. Except for adjusting the relevant preparation parameters according to Table 1, the rest are the same as in Example 1 and will not be repeated. In Examples 1, 2, 5, 7, Comparative Examples 1, 2, and 5, the solution containing the polymer monomer also includes a small amount of crosslinking agent (hydrogen-containing silicone oil) and catalyst (Castel catalyst, whose main component is Pt2(1,1,3,3-tetramethyl-1,3-divinyldisiloxane)3). In Comparative Example 10, the solution containing the polymer monomer does not include the crosslinking agent and catalyst. That is, when the polymer monomer is vinyl silicone oil, except for Comparative Example 10, the solution containing the polymer monomer in the other examples and comparative examples also includes a small amount of crosslinking agent (hydrogen-containing silicone oil) and catalyst (Castel catalyst, whose main component is Pt2(1,1,3,3-tetramethyl-1,3-divinyldisiloxane)3). In Example 8, the paper base layer also includes chitosan particles, with a content of 4.2 wt% and a particle size of 2.5 μm. In Example 9, the paper base layer also includes chitosan particles, with a content of 6.6 wt% and a particle size of 4.1 μm.

[0082] Table 1

[0083]

[0084] The anti-seepage effect and opacity of the cigarette paper provided in the above embodiments and comparative examples were tested, and the relevant test results are detailed in Table 2.

[0085] The cigarette papers provided in Examples 3, 8, and 9 were used to prepare heated cigarettes. The structure of the heated cigarettes was as follows: the filter rod was 33 mm long, of which the length of the cellulose acetate bundle was 7 mm and the length of the hollow cellulose acetate tube was 26 mm; the length of the tobacco shreds was 12 mm. The sensory quality of the prepared heated cigarettes was evaluated, and the scores are shown in Table 2.

[0086] Table 2

[0087]

[0088] As shown in Table 2, the opacity of the cigarette paper provided in this embodiment of the present invention is above 73.6%; after being treated at a temperature of 38°C and a humidity of 80% for 24 hours, no visible stains or spots were observed on the outer surface of the cigarette paper, indicating good anti-permeability performance.

[0089] The comparative analysis shows that when cigarette paper only includes an anti-permeability layer or a barrier layer, the opacity of the cigarette paper is low or the anti-permeability performance is poor, which cannot meet the usage requirements.

[0090] Analysis of the sensory quality evaluation scores of cigarettes shows that adding chitosan particles to the paper base layer improves the sensory quality of heated cigarettes. This is because the chitosan particles decompose when the cigarette is heated by the heating element of the heated cigarette device, forming micron-sized pores on the cigarette paper. This increases the permeability of the cigarette paper during smoking, thereby enhancing the sensory quality of heated cigarettes.

[0091] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cigarette paper for heating cigarettes, characterized in that, The cigarette paper includes a base layer, a release layer, and an impermeable layer; The anti-permeability layer is disposed on the surface of the isolation layer to prevent soluble substances in tobacco products from permeating into the paper base layer. The anti-permeability layer is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer. The isolation layer is disposed on the surface of the paper base layer to isolate the paper base layer and the polymer monomer, preventing some or all of the polymer monomer from entering the pores of the paper base layer; The cigarette paper has an opacity of 73% or higher, and the separation layer has a unit area mass of 0.2–5.0 g / m². 2 The impermeability barrier layer has a unit area mass of 0.2–5.0 g / m² based on silicon. 2 .

2. The cigarette paper for heating cigarettes according to claim 1, characterized in that, The paper base layer is white paper base layer; The basis weight of the paper base is 25-60 g / m³. 2 .

3. A heated cigarette, comprising cigarette paper and a tobacco product wrapped in said cigarette paper, characterized in that, The cigarette paper includes a base layer, a release layer, and an impermeable layer; The anti-permeability layer is disposed on the surface of the isolation layer to prevent soluble substances in tobacco products from permeating into the paper base layer. The anti-permeability layer is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer. The isolation layer is disposed on the surface of the paper base layer to isolate the paper base layer from the polymer monomer and prevent the polymer monomer from entering the pores of the paper base layer.

Images