Cigarette paper and heating cigarette

Abstract

The invention provides cigarette paper and a heating cigarette, and belongs to the technical field of tobacco products. The cigarette paper comprises a paper base layer, an isolating layer and an impermeable layer, the anti-permeation layer is arranged on the surface of the isolation layer and used for preventing soluble substances in the tobacco products from permeating into the paper base layer, and the anti-permeation layer is formed through in-situ polymerization of polymer monomers on the surface of the isolation layer; the isolating layer is arranged on the surface of the paper base layer and used for isolating the paper base layer from the polymer monomer and preventing the polymer monomer from entering pores of the paper base layer.

Description

Technical Field

[0001] The present disclosure relates to the technical field of tobacco products, and particularly to a cigarette paper and a heated cigarette. Background Art

[0002] Heated non-combustible tobacco products have attracted much attention because they are closest to traditional cigarettes in terms of sensory quality and smoking mode. Due to the different usage methods of traditional cigarettes and heated cigarettes, there are certain differences in their auxiliary materials, and cigarette paper is one of them. The production formula of cigarette paper used in traditional cigarettes mainly includes four categories of substances: natural fibers, fillers, combustion aids, and additives. In the production of traditional cigarette paper for cigarettes, the above four categories of substances are essential. However, in low-temperature cigarettes, the cigarette does not need to burn, there is no requirement for the content of the combustion aid in the cigarette paper, and the requirement for the air permeability of the cigarette paper is not high. On the other hand, a large amount of glycerol is commonly used in the tobacco of heated cigarettes. It has strong hygroscopicity, resulting in an increase in the moisture content in the tobacco. The soluble substances in the tobacco are easily transferred to the cigarette paper, thus generating spots, affecting the appearance quality of the cigarette, and at the same time reducing the opacity of the cigarette paper. Opacity is one of the key quality indicators of cigarette paper. The opacity of cigarette paper not only ensures the uniformity and quality of the product, but also affects the burning speed, taste, and the user experience of consumers. According to relevant regulations, the opacity of Grade A products should not be less than 73%.

[0003] Therefore, the cigarette paper needs to add a new anti-permeation function. In related technologies, aluminum composite paper is commonly used for heated cigarettes. Aluminum is covered on the paper base by electroplating or transfer methods to form cigarette paper. Aluminum composite paper has obvious disadvantages: its preparation process is complex and the cost is high; aluminum cannot be recycled, causing environmental pollution. In addition, due to the introduction of metal, microwave equipment cannot be used to detect heated cigarettes produced with this cigarette paper.

[0004] Therefore, there is an urgent need to develop a cigarette paper with high opacity, good anti-permeation performance, low cost, and environmental protection. Summary of the Invention

[0005] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides a cigarette paper and a heated cigarette.

[0006] According to an embodiment of one aspect of the present disclosure, there is provided a cigarette paper for a heated cigarette. The cigarette paper includes a paper base layer, an isolation layer, and an anti-permeation layer; the anti-permeation layer is disposed on the surface of the isolation layer and is used to prevent soluble substances in the tobacco product from permeating into the paper base layer. The anti-permeation 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 and is used to isolate the paper base layer and the polymer monomers to prevent the polymer monomers from entering the pores of the paper base layer.

[0007] According to an embodiment of the present disclosure, the above paper base layer is a white paper base layer; the content of white filler in the above paper base layer is 5.0 wt% to 35.0 wt%; the basis weight of the above paper base layer is 25 to 60 g / m 2 .

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

[0009] According to an embodiment of the present disclosure, the above polymer monomer includes at least one of amino silicone oil and vinyl silicone oil.

[0010] According to an embodiment of the present disclosure, the temperature of the above in-situ polymerization is 80 to 180 °C.

[0011] According to an embodiment of the present disclosure, the above paper base layer includes chitosan particles, and the chitosan particles decompose when the heating component heats the heated cigarette, so as to form micron-sized holes on the above cigarette paper.

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

[0013] According to an embodiment of the present disclosure, the mass content of the above chitosan particles in the above paper base layer is 1% to 10%.

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

[0015] According to an embodiment of the present disclosure, the unit area mass of the above isolation layer is 0.2 to 5.0 g / m 2 .

[0016] According to an embodiment of the present disclosure, the unit area mass of the above anti-permeation layer in terms of silicon is 0.2 to 5.0 g / m 2 .

[0017] According to an embodiment of another aspect of the present disclosure, there is provided a method for preparing a cigarette paper for a heated cigarette, including: preparing an isolation layer on the surface of a paper base layer to obtain a composite layer; coating a solution including a polymer monomer on one side of the isolation layer of the above composite layer, and subjecting the above polymer monomer to in-situ polymerization to obtain a cigarette paper for a heated cigarette.

[0018] According to an embodiment of another aspect of the present disclosure, there is provided a heated cigarette, comprising cigarette paper, wherein the cigarette paper comprises a paper base layer, a barrier layer and a moisture-proof layer; the moisture-proof layer is disposed on the surface of the barrier layer for preventing soluble substances in the tobacco product from penetrating into the paper base layer, and the moisture-proof layer is formed by in-situ polymerization of polymer monomers on the surface of the barrier layer; the barrier layer is disposed on the surface of the paper base layer for isolating the paper base layer and the polymer monomers to prevent some or all of the polymer monomers from entering the pores of the paper base layer.

[0019] The cigarette paper for a heated cigarette provided by the embodiments of the present disclosure comprises a paper base layer, a barrier layer and a moisture-proof layer which are sequentially stacked. Among them, the moisture-proof layer is used to prevent soluble substances in the tobacco product from penetrating into the paper base layer, avoiding the generation of spots and ensuring the appearance quality of the cigarette paper; forming the moisture-proof layer by in-situ polymerization of polymer monomers on the surface of the barrier layer can improve the bonding strength between the barrier layer and the moisture-proof layer and reduce the amount of the moisture-proof layer used; the barrier layer is used to isolate the paper base layer and the polymer monomers to prevent the polymer monomers from entering the pores of the paper base layer, avoiding the influence of the polymer monomers on the opacity of the paper base layer 1. The cigarette paper provided by the embodiments of the present disclosure has the advantages of high opacity, good moisture-proof performance, low cost and environmental protection. In addition, since the cigarette paper for a heated cigarette provided by the embodiments of the present disclosure does not contain metal, a microwave instrument widely used in traditional cigarettes can be used to online detect the quality of the heated cigarette without replacing the detection equipment, reducing the cost and ensuring the quality of the heated cigarette. Brief Description of the Drawings

[0020] Through the following description of the embodiments of the present disclosure with reference to the drawings, the above and other objects, features and advantages of the present disclosure will become more apparent. In the drawings:

[0021] Figure 1 A schematic structural diagram of a cigarette paper for a heated cigarette according to an embodiment of the present disclosure is shown;

[0022] In the above drawings, the meanings of the reference numerals are specifically as follows:

[0023] 1 - paper base layer;

[0024] 2 - barrier layer;

[0025] 3 - moisture-proof layer. Detailed Description of the Embodiments

[0026] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the following detailed description, for the sake of explanation, numerous specific details are set forth in order to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is obvious that one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present disclosure.

[0027] The terms used herein are merely for describing specific embodiments and are not intended to limit the present disclosure. The term "comprising" used herein indicates the presence of features, steps, operations, but does not exclude the presence or addition of one or more other features.

[0028] In the case of using expressions such as "at least one of A, B, and C, etc.", generally, it should be interpreted according to the meaning that those skilled in the art usually understand this expression (for example, "a system having at least one of A, B, and C" should include but not be limited to a system having only A, having only B, having only C, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", generally, it should be interpreted according to the meaning that those skilled in the art usually understand this expression (for example, "a system having at least one of A, B, or C" should include but not be limited to a system having only A, having only B, having only C, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0029] In the process of implementing the present disclosure, it is found that the anti-permeability performance of cigarette paper can be improved by preparing an anti-permeability layer on the surface of the paper base layer. For this purpose, the inventors have made a large number of attempts. Considering the effects of the preparation process, the dosage of the anti-permeability layer, and the bonding strength between the anti-permeability layer and the paper base layer, etc., an in-situ polymerization method is tried to form an anti-permeability layer on the surface of the paper base layer. However, the inventors find in the experiment process that this method will reduce the opacity of the cigarette paper.

[0030] The inventors analyze and find that this is because by using the in-situ polymerization method, the polymer monomers can enter the pores of the paper base layer. After the polymer monomers enter the pores of the paper base layer, the air in the paper pores can be displaced; since air can absorb light, after the air decreases, the light transmission ability in the paper increases, resulting in an increase in the transparency of the paper and a decrease in the opacity; after the opacity of the paper decreases, the wrapped tobacco can be seen vaguely, resulting in a bad visual effect.

[0031] On this basis, the inventor further improved the structure of the cigarette paper by adding an isolation layer between the paper base layer and the anti-permeation layer to isolate the paper base layer and the polymer monomers, prevent some or all of the polymer monomers from entering the pores of the paper base layer, and reduce the influence of the polymer monomers on the opacity of the cigarette paper.

[0032] Specifically, the present disclosure provides a cigarette paper for a heated cigarette, as Figure 1 shown. The cigarette paper includes a paper base layer 1, an isolation layer 2, and an anti-permeation layer 3; the anti-permeation layer 3 is disposed on the surface of the isolation layer 2 to prevent soluble substances in the tobacco product from permeating into the paper base layer 1, and the anti-permeation 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 and the polymer monomers and prevent some or all of the polymer monomers from entering the pores of the paper base layer 1.

[0033] The cigarette paper for a heated cigarette provided by the embodiment of the present disclosure includes a paper base layer 1, an isolation layer 2, and an anti-permeation layer 3 stacked in sequence. Among them, the anti-permeation layer 3 is used to prevent soluble substances in the tobacco product from permeating into the paper base layer 1, avoid the generation of spots, and ensure the appearance quality of the cigarette paper; forming the anti-permeation layer 3 by in-situ polymerization of polymer monomers on the surface of the isolation layer 2 can improve the bonding strength between the isolation layer 2 and the anti-permeation layer 3 and reduce the amount of the anti-permeation layer 3 used; the isolation layer 2 is used to isolate the paper base layer 1 and the polymer monomers and prevent the polymer monomers from entering the pores of the paper base layer 1, avoiding the influence of the polymer monomers on the opacity of the paper base layer 1. The cigarette paper provided by the embodiment of the present disclosure has advantages such as high opacity, good anti-permeation performance, low cost, and environmental protection.

[0034] In addition, since the cigarette paper for a heated cigarette provided by the embodiment of the present disclosure does not contain metal, a microwave instrument widely used in traditional cigarettes can be used to online detect the quality of the heated cigarette without replacing the detection equipment, reducing the cost and ensuring the quality of the heated cigarette.

[0035] It should be noted that the isolation layer 2 can prevent some polymer monomers from entering the pores of the paper base layer 1. At this time, a small amount of polymer monomers can penetrate through the isolation layer 2 and enter the paper base layer 1 to combine with the fibers. After in-situ polymerization, the bonding strength between the paper base layer 1, the isolation layer 2, and the anti-permeation layer 3 can be improved; the influence of a small amount of polymer monomers on the opacity of the paper base layer 1 is relatively small and can be left untreated, or 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 regulated by the thickness and material of the isolation layer 2. The isolation layer 2 can also prevent all polymer monomers from entering the pores of the paper base layer 1, thereby avoiding the influence of the polymer monomers on the opacity of the paper base layer 1.

[0036] According to an embodiment of the present disclosure, the paper base layer 1 is a white paper base layer. The white paper base layer can be produced using white pulp. The present disclosure does not limit the selection of white pulp, and those skilled in the art can conventionally select white pulp according to actual needs. For example, the white pulp can be an existing commercial pulp. White fillers can be added to the pulp, and the content of white fillers in the white paper base layer can be 5.0wt% - 35.0wt%. Optionally, the content of white fillers can be 10.0wt% - 30.0wt%. Exemplarily, the content of white fillers can be 5.0wt%, 6.0wt%, 7.0wt%, 8.0wt%, 9.0wt%, 10.0wt%, 11.0wt%, 12.0wt%, 13.0wt%, 14.0wt%, 15.0wt%, 18.0wt%, 20.0wt%, 22.0wt%, 25.0wt%, 28.0wt%, 30.0wt%, 32.0wt%, 35.0wt% or a range composed of any two of the above values. The present disclosure does not limit the selection of white fillers, and those skilled in the art can conventionally select white fillers according to actual needs. For example, the white filler can be calcium carbonate. The content of calcium carbonate in the white paper base layer can be 5.0wt% - 35.0wt%. The purpose of using white pulp and white fillers is to make the finished paper white and provide a certain opacity to the paper.

[0037] According to an embodiment of the present disclosure, the basis weight of the white paper base layer can be 25 - 60 g / m 2 , optionally, the basis weight of the white paper base layer can be 30 - 50 g / m 2 . Exemplarily, the basis weight of the white paper base layer can be 25 g / m 2 , 28 g / m 2 , 30 g / m 2 , 32 g / m 2 , 35 g / m 2 , 38 g / m 2 , 40 g / m 2 , 45 g / m 2 , 50 g / m 2 , 55 g / m 2 , 60 g / m 2 or a range composed of any two of the above values. A suitable basis weight can keep the paper base layer 1 having a certain strength after adding white fillers.

[0038] According to the embodiments of the present disclosure, in order to improve the air permeability of cigarette paper during smoking, chitosan particles can be included in the paper base layer 1, and the chitosan particles are decomposed when the heating component of the heating device heats the cigarette to form micron-sized holes on the cigarette paper. The chitosan particles decompose to first form micron-sized holes on the paper base layer 1, and the holes in the paper base layer 1 will damage the isolation layer 2 and the anti-permeation layer 3, so that the isolation layer 2 and the anti-permeation layer 3 also form micron-sized holes accordingly. The size of the micron-sized holes can be adjusted by controlling the particle size of the chitosan particles.

[0039] It should be noted that the paper base layer 1 includes a number of chitosan particles. When the heating component heats the heated cigarette, all or part of the chitosan particles may be decomposed to form micron-sized holes on the cigarette paper.

[0040] According to the embodiments of the present disclosure, chitosan particles are a kind of high molecular biodegradable material extracted from chitin as the main raw material, which is insoluble in water. Chitosan particles can be attached to wood pulp fibers during the papermaking process, which can be effectively added; chitosan begins to decompose at about 200°C and decomposes rapidly in the range of 250~300°C; during the use of heated cigarettes, the temperature of the heating component of the heated smoking device is generally around 300°C, at which time the granular chitosan decomposes rapidly, and micron-sized pores are generated on the cigarette paper, which can increase the real-time air permeability of the cigarette paper; when smoking heated cigarettes, external air can enter the cigarette through the cigarette paper, and the air distribution is more uniform, which is conducive to the pyrolysis of tobacco products such as tobacco shreds and tobacco flakes, thereby improving the smoking quality.

[0041] According to an embodiment of the present disclosure, the particle size of the chitosan particles is 0.5 to 5 μm. Optionally, the particle size of the chitosan particles can be 1 to 3 μm. Exemplarily, the particle size of the chitosan particles can be 0.5 μm, 1.0 μm, 1.5 μm, 2.0 μm, 2.5 μm, 3.0 μm, 3.5 μm, 4.0 μm, 4.5 μm, 5.0 μm or a range consisting of any two of the above values. The particle size of the chitosan particles is within the above numerical range, so that the granular chitosan can be decomposed to produce holes of appropriate size on the cigarette paper, which not only ensures the air permeability of the cigarette paper, but also avoids the holes being too large, causing damage to the cigarette paper.

[0042] According to an embodiment of the present disclosure, 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 composed of any two of the above values. When the content of chitosan particles is within the above numerical range, the granular chitosan can decompose to generate an appropriate number of holes in the cigarette paper, ensuring the air permeability of the cigarette paper while avoiding excessive holes and causing damage to the cigarette paper.

[0043] According to an embodiment of the present disclosure, the opacity of the cigarette paper is above 73%. By having the opacity of the cigarette paper above 73%, the quality of the heated cigarette made of the cigarette paper can be improved.

[0044] According to an embodiment of the present disclosure, the barrier layer 2 includes at least one of polyvinyl butyral and polyvinyl alcohol. Exemplarily, the barrier layer 2 can include polyvinyl butyral, the barrier layer 2 can also include polyvinyl alcohol, and the barrier layer 2 can further include polyvinyl butyral and polyvinyl alcohol. Polyvinyl butyral and polyvinyl alcohol have film-forming properties at room temperature and can form a film on the paper base surface, and the process is simple.

[0045] According to an embodiment of the present disclosure, the mass per unit area of the barrier layer 2 can be 0.2 to 5.0 g / m 2 . Optionally, the mass per unit area of the barrier layer 2 is 0.5 to 3.0 g / m 2 . Exemplarily, the mass per unit area of the barrier layer 2 is 0.2 g / m 2 , 0.3 g / m 2 , 0.5 g / m 2 , 0.8 g / m 2 , 1.0 g / m 2 , 1.2 g / m 2 , 1.5 g / m 2 , 2.0 g / m 2 , 2.5 g / m 2 , 3.0 g / m 2 , 3.5 g / m 2 , 4.0 g / m 2 , 4.5 g / m 2 , 5.0 g / m 2 or a range composed of any two of the above values. When the mass per unit area of the barrier layer 2 is within the above range, it can prevent some or all of the polymer monomers from entering the paper base layer 1 and reduce or avoid the influence of the polymer monomers on the opacity of the paper base layer 1.

[0046] It should be noted that the greater the mass per unit area of the isolation layer 2, the less the amount of polymer monomer entering the paper base layer 1, and the smaller the impact of the polymer monomer on the opacity of the paper base layer 1. The smaller the mass per unit area of the isolation layer 2, the more the amount of polymer monomer entering the paper base layer 1, and the greater the impact of the polymer monomer 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 paper basis weight and / or the content of white filler of the paper base layer 1 to meet the quality requirements of cigarette paper.

[0047] There are many types of polymers with various forms, including liquid, solid, and gel states. Appropriate polymer monomers can be selected according to their respective properties, process characteristics, etc. to form the anti-permeation layer 3.

[0048] Optionally, the polymer monomer includes at least one of amino silicone oil and vinyl silicone oil. Exemplarily, the polymer monomer can include amino silicone oil, the polymer monomer can also include vinyl silicone oil, and the polymer monomer can also include amino silicone oil and vinyl silicone oil. By in-situ polymerization on the surface of the isolation layer 2 to form the anti-permeation layer 3, the anti-permeation performance of the cigarette paper can be improved, preventing the soluble substances in the tobacco product from permeating into the paper base layer 1 and avoiding the generation of spots; in addition, the anti-permeation layer 3 formed by polymerization of at least one of amino silicone oil and vinyl silicone oil has good heat resistance and can improve the high-temperature resistance of the cigarette paper.

[0049] Amino silicone oil and vinyl silicone oil are liquid substances with good dispersion uniformity on the substrate. A small part can penetrate into the paper base layer 1 and combine with the fibers, and most of them combine with polyvinyl butyral ester and / or polyvinyl alcohol in the isolation layer 2; after treatment under high-temperature conditions, the bonding force is further enhanced to form a more firm, dense, and continuous anti-permeation layer 3, which is the advantage of in-situ polymerization. If a polymer such as solid or gel-state silicone resin is directly coated, a large amount of adhesive is required for adhesion. The adhesive itself also needs to be waterproof and anti-permeable, and it is difficult to form a continuous film, and the overall coating amount is also larger.

[0050] Among them, amino silicone oil can crosslink by itself at high temperature and has film-forming properties; a curing agent such as stannous acetate can also be added to accelerate the curing of amino silicone oil. Vinyl silicone oil does not have film-forming properties and needs to be crosslinked by a crosslinking agent and a catalyst to form a film. At normal temperature, amino silicone oil and vinyl silicone oil still remain in a liquid state microscopically and are not cured into a solid film. Therefore, they need to be cured into a film to achieve a better anti-permeation effect. Amino silicone oil and vinyl silicone oil can be commercially available products, and relevant technical personnel can select them routinely according to actual needs.

[0051] It should be noted that in addition to amino silicone oil and / or vinyl silicone oil, the solution including the polymer monomer can also include a solvent to uniformly coat the amino silicone oil and / or vinyl silicone oil on the surface of the paper base.

[0052] Exemplarily, 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 composed of any two of the above values.

[0053] Furthermore, the solution including polymer monomers may further include a catalyst, a curing agent, a crosslinking agent, etc., so that the amino silicone oil and / or vinyl silicone oil polymerize to form a protective film.

[0054] According to an embodiment of the present disclosure, the temperature of in-situ polymerization is 80 to 180 °C. Optionally, the temperature of in-situ polymerization may be 130 to 160 °C. Exemplarily, the temperature of in-situ polymerization may be 80 °C, 90 °C, 100 °C, 110 °C, 120 °C, 130 °C, 140 °C, 150 °C, 160 °C, 170 °C, 180 °C or a range composed of any two of the above values.

[0055] According to an embodiment of the present disclosure, the mass per unit area of the anti-permeation layer 3 in terms of silicon may be 0.2 to 5.0 g / m 2 . Optionally, the mass per unit area of the anti-permeation layer 3 in terms of silicon may be 0.5 to 3.0 g / m 2 . Exemplarily, the mass per unit area of the anti-permeation layer 3 in terms of silicon may be 0.2 g / m 2 , 0.5 g / m 2 , 0.8 g / m 2 , 1.0 g / m 2 , 1.5 g / m 2 , 2.0 g / m 2 , 2.5 g / m 2 , 3.0 g / m 2 , 3.5 g / m 2 , 4.0 g / m 2 , 4.5 g / m 2 , 5.0 g / m 2 or a range composed of any two of the above values. A suitable mass per unit area can endow the anti-permeation layer 3 with both anti-permeation performance and appropriate tear resistance.

[0056] According to an embodiment of another aspect of the present disclosure, a method for preparing cigarette paper for a heated cigarette is provided, including steps S2 and S3.

[0057] In operation S2, an isolation layer is prepared on the surface of the paper base layer to obtain a composite layer.

[0058] 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 in-situ polymerized to obtain cigarette paper for heated cigarettes.

[0059] The method for preparing cigarette paper provided by the embodiments of the present disclosure has a simple process, is easy to operate, energy-saving and environmentally friendly. The production of cigarette paper can be completed without special equipment, reducing the production cost of cigarette paper.

[0060] According to an embodiment of the present disclosure, before step S2, step S1 may further be included. In step S1, a paper base layer is prepared using white pulp. Optionally, calcium carbonate may be added to the pulp, and the content of calcium carbonate 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 / m 2 optionally 30 - 50 g / m 2 .

[0061] According to an embodiment of the present disclosure, in operation S2, a solution containing polyvinyl butyral or a solution containing polyvinyl alcohol or both may be coated on the surface of the prepared paper base layer, so that the unit area mass of the isolation layer is 0.2 - 5.0 g / m 2 optionally 0.5 - 3.0 g / m 2 . Optionally, polyvinyl butyral can be dissolved in ethanol to obtain a solution containing polyvinyl butyral; polyvinyl alcohol can be dissolved in water to obtain a solution containing polyvinyl alcohol. After coating, it can be dried in a conventional manner.

[0062] According to an embodiment of the present disclosure, in step S3, a solution containing polymer monomers is coated on one side of the isolation layer of the composite layer. The polymer monomers may be one or both of amino silicone oil and vinyl silicone oil, so that the unit area mass (calculated as silicon) of the polymer monomers on the isolation layer after polymerization is 0.2 - 5.0 g / m 2 optionally 0.5 - 3.0 g / m 2 .

[0063] According to an embodiment of the present disclosure, in step S3, after coating a solution containing polymer monomers on one side of the isolation layer of the composite layer, it is placed under high temperature conditions for curing. The curing temperature may be 80 - 180 °C, optionally 130 - 160 °C. The curing time is closely related to the temperature. The higher the temperature, the shorter the curing time; the lower the temperature, the longer the curing time. The curing time ranges from several seconds to several days. The fact that there is no liquid substance on the paper base surface indicates that it has been cured, and the curing time is not limited here. High-temperature curing can be used to shorten the operation time.

[0064] According to an embodiment of another aspect of the present disclosure, there is provided a heated cigarette, comprising cigarette paper and a tobacco product wrapped by the cigarette paper. The cigarette paper includes a paper base layer, an isolation layer, and an anti-permeation layer; the anti-permeation layer is disposed on the surface of the isolation layer for preventing soluble substances in the tobacco product from permeating into the paper base layer, and the anti-permeation 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 for isolating the paper base layer and the polymer monomers and preventing some or all of the polymer monomers from entering the pores of the paper base layer.

[0065] The embodiments of the present disclosure do not limit the tobacco product wrapped by the cigarette paper, and those skilled in the art can conventionally select the tobacco product according to actual needs. Exemplarily, the tobacco product wrapped by the cigarette paper may include cut tobacco, reconstituted tobacco, tobacco particles, etc.

[0066] It should be noted that in a heated cigarette, the side of the anti-permeation layer of the cigarette paper is the inner surface, which contacts the tobacco product to prevent soluble substances in the tobacco product from permeating into the paper base layer.

[0067] The present invention will be described in detail below with reference to embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0068] Detection method:

[0069] Anti-permeation effect detection:

[0070] After treating the cigarette papers provided in each embodiment and comparative example under the conditions of a temperature of 38 °C and a humidity of 80% for 24 hours, observe whether stain spots on the outer surface of the cigarette paper are visible to the naked eye.

[0071] Opacity detection:

[0072] Perform opacity detection on the cigarette papers provided in each embodiment and comparative example with reference to "GB / T 1543-2005 Paper and board - Determination of opacity (paper backing) (Diffuse reflectance method)".

[0073] Cigarette sensory quality evaluation:

[0074] Evaluate the sensory quality of the cigarette according to the method recommended in "Cigarettes - Part 2: Sensory technical requirements" (GB 5606.2-2005). Example 1

[0075] This embodiment provides a cigarette paper, which includes a paper base layer, an isolation layer, and an anti-permeation layer; the anti-permeation layer is disposed on the surface of the isolation layer for preventing soluble substances in the tobacco product from permeating into the paper base layer, and the anti-permeation 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 for isolating the paper base layer and the polymer monomers and preventing the polymer monomers from entering the pores of the paper base layer.

[0076] This embodiment also provides a method for preparing the cigarette paper. The relevant process parameters are shown in Table 1 and include the following steps:

[0077] (1) Prepare a paper base layer using white pulp and add calcium carbonate to the pulp. Among them, the calcium carbonate content in the paper base layer is 28.0 wt%, and the basis weight of the paper base layer is 38.2 g / m 2 , and no chitosan particles are added.

[0078] (2) Prepare a barrier layer on the surface of the paper base layer to obtain a composite layer. Among them, the unit area mass of the barrier layer is 1.5 g / m 2 . The material of the barrier layer is polyvinyl butyral.

[0079] (3) Coat a solution containing polymer monomers on the barrier layer side of the composite layer, in-situ polymerize the polymer monomers, and form an anti-permeation layer on the barrier layer side of the composite layer to obtain the cigarette paper for heated cigarettes. Among them, the polymer monomer is vinyl silicone oil, and the unit area mass of the anti-permeation layer calculated as silicon is 1.2 g / m 2 , and the in-situ polymerization temperature is 130 °C.

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

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

[0082] Table 1

[0083]

[0084] The cigarette papers provided in the above-mentioned embodiments and comparative examples were subjected to anti-seepage effect test and opacity test. The relevant test results are shown in Table 2.

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

[0086] Table 2

[0087]

[0088] From the analysis of Table 2, it can be seen that the opacity of the cigarette paper provided in the embodiment of the present disclosure is above 73.6%; after being treated at a temperature of 38° C. and a humidity of 80% for 24 hours, no stains visible to the naked eye are observed on the outer surface of the cigarette paper, and the anti-penetration performance is good.

[0089] It can be seen from the comparative analysis that when the cigarette paper only includes an anti-permeation layer or an isolation layer, the opacity of the cigarette paper is low or the anti-permeation performance is poor, and cannot meet the use requirements.

[0090] The analysis of the sensory quality evaluation scores of cigarettes shows that the sensory quality of heated cigarettes is improved after adding chitosan particles to the paper base. This is because the chitosan particles decompose when the heating components of the heated smoking device heat the heated cigarettes to form micron-sized holes on the cigarette paper, which improves the air permeability of the cigarette paper during smoking, thereby improving the sensory quality of heated cigarettes.

[0091] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A cigarette paper for heating cigarettes, characterized in that: The cigarette paper comprises a paper base layer, an isolation layer and an anti-permeation layer; The anti-permeation layer is arranged on the surface of the isolation layer to prevent soluble substances in the tobacco products from penetrating into the paper base layer, and the anti-permeation layer is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer; The isolation layer is arranged on the surface of the paper base layer, and is used to isolate the paper base layer from the polymer monomers, so as to prevent part or all of the polymer monomers from entering the pores of the paper base layer.

2. The cigarette paper for heating cigarettes according to claim 1, characterized in that: The paper base layer is a white paper base layer; The content of the white filler in the paper base layer is 5.0wt% to 35.0wt%; The paper base has a basis weight of 25-60 g / m 2 .

3. The cigarette paper for heating cigarettes according to claim 1, characterized in that: The isolation layer includes at least one of polyvinyl butyral and polyvinyl alcohol; The polymer monomer includes at least one of amino silicone oil and vinyl silicone oil.

4. The cigarette paper for heating cigarettes according to claim 1, characterized in that: The temperature of the in-situ polymerization is 80-180°C.

5. The cigarette paper for heating cigarettes according to any one of claims 1 to 4, characterized in that: The paper base layer includes chitosan particles, which are decomposed when the heating component heats the cigarette to form micron-sized holes on the cigarette paper.

6. The cigarette paper for heating cigarettes according to claim 5, characterized in that: The particle size of the chitosan particles is 0.5-5 μm; The mass content of the chitosan particles in the paper base layer is 1% to 10%.

7. The cigarette paper for heating cigarettes according to any one of claims 1 to 4, characterized in that: The opacity of the cigarette paper is above 73%.

8. The cigarette paper for heating cigarettes according to claim 3, characterized in that: The mass per unit area of ​​the isolation layer is 0.2-5.0 g / m 2 ; The anti-permeation layer has a unit area mass of 0.2 to 5.0 g / m 2 .

9. A method for preparing cigarette paper for heating cigarettes, characterized in that: include: preparing an isolation layer on the surface of the paper base layer to obtain a composite layer; A solution including 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.

10. A heated cigarette, comprising cigarette paper and a tobacco product wrapped by the cigarette paper, characterized in that: The cigarette paper comprises a paper base layer, an isolation layer and an anti-permeation layer; The anti-permeation layer is arranged on the surface of the isolation layer to prevent soluble substances in the tobacco products from penetrating into the paper base layer, and the anti-permeation layer is formed by in-situ polymerization of polymer monomers on the surface of the isolation layer; The isolation layer is arranged on the surface of the paper base layer, and is used to isolate the paper base layer from the polymer monomers, so as to prevent the polymer monomers from entering into the pores of the paper base layer.

Images