Cigarette paper and method for manufacturing the same, and cigarette

Abstract

The application provides a cigarette paper, a preparation method thereof and a cigarette. The cigarette paper comprises a base material, a shielding layer arranged on the base material, components of the shielding layer comprising a shielding material and a first resin, a whitening layer arranged on a surface of the shielding layer away from the base material, components of the whitening layer comprising a whitening material and a second resin, and the opacity of the cigarette paper is greater than or equal to 75%. When the cigarette paper of the application is used as a tipping paper of a heat-not-burn cigarette, the heat-not-burn cigarette can be well twisted and connected, the cigarette paper can effectively cover the sheet powder on the inner side of the tipping paper of the heat-not-burn cigarette, and the appearance quality of the cigarette is improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco product technology, and in particular to a cigarette paper and its preparation method, and cigarettes. Background Technology

[0002] Heated tobacco products suffer from a severe "dust trapping" phenomenon during production, meaning that some tobacco shreds remain on the outside of the filter rod or cooling section and on the inside of the attaching paper during the rolling process. The main reasons for this "dust trapping" are twofold: 1) Heated tobacco products often use a slurry method or papermaking process to produce thin sheet tobacco. Compared to traditional cigarette tobacco, thin sheet tobacco has weaker tensile strength and is prone to breakage during production, forming thin sheet fragments; 2) Heated tobacco sheet tobacco contains a relatively large amount of glycerin as an atomizing agent, making it more prone to adhesion compared to traditional tobacco. Therefore, simply modifying the rolling machine is unlikely to reduce the occurrence of "dust trapping" in heated tobacco products.

[0003] Traditional cigarettes often use colored tipping paper to cover up the "end-burst" phenomenon, rarely resulting in serious appearance quality problems. However, major domestic and international heated tobacco product manufacturers all choose white tipping paper, making the "end-burst" phenomenon more prominent in heated tobacco products. The "end-burst" phenomenon in heated tobacco products severely affects the appearance of the cigarette and can also lead to poor splicing, resulting in wrinkled and curled tipping paper, air leakage, and other issues, seriously impacting the consumer experience. Summary of the Invention

[0004] Based on this, the present invention provides cigarette paper that enables good cigarette splicing and effectively covers the thin flakes and fragments inside the cigarette packing paper, as well as the preparation method thereof and cigarettes.

[0005] The technical solution proposed in this invention is as follows:

[0006] According to a first aspect of the present invention, cigarette paper is provided, comprising:

[0007] Substrate;

[0008] A shielding layer is disposed on the substrate, and the components of the shielding layer include a shielding material and a first resin;

[0009] A whitening layer is disposed on the surface of the masking layer opposite to the substrate, and the components of the whitening layer include a whitening material and a second resin;

[0010] The opacity of the cigarette paper is greater than or equal to 75%.

[0011] In any embodiment, the shielding material includes one or more of kaolin, zinc oxide, and barium oxide.

[0012] In any embodiment, the whitening material includes one or more of light calcium carbonate, zinc oxide, barium oxide, and talc.

[0013] In any embodiment, the opacity of the cigarette paper is 75% to 85%.

[0014] In any embodiment, the first resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the masking material, the alcohol-soluble resin and the ester-soluble resin in the masking layer is (15~30):(5~20):(5~20).

[0015] In any embodiment, the second resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the whitening material, the alcohol-soluble resin and the ester-soluble resin in the whitening layer is (10~35):(5~25):(5~25).

[0016] In any embodiment, the alcohol-soluble resin includes one or more of polyvinyl butyral resin, alcohol-soluble polyurethane resin, rosin resin, and alcohol-soluble nitrocellulose resin.

[0017] In any embodiment, the ester-soluble resin includes one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin.

[0018] In any embodiment, the viscosity of both the alcohol-soluble resin and the ester-soluble resin, measured using a British 2# cup at 25 °C, is 2 to 15 seconds.

[0019] In any embodiment, the substrate is an impermeable base paper, and the basis weight of the substrate is 20 g / m². 2 ~40 g / m 2 .

[0020] In any embodiment, the cigarette paper further includes a varnish layer disposed on the surface of the whitening layer opposite to the shielding layer, the varnish layer comprising an abrasion-resistant material and an ester-soluble resin, the abrasion-resistant material comprising polyethylene wax.

[0021] In any embodiment, the cigarette paper further includes a graphic layer disposed between the whitening layer and the varnish layer.

[0022] According to a second aspect of the present invention, a method for preparing cigarette paper according to the first aspect of the present invention is provided, comprising the following steps:

[0023] Provide base materials;

[0024] A masking layer slurry is applied to at least one surface of the substrate and dried to form a masking layer; the masking layer slurry comprises a first resin, a masking material, and a first solvent;

[0025] A whitening layer slurry is attached to the surface of the masking layer opposite to the substrate and dried to form a whitening layer; the whitening layer slurry includes a second resin, a whitening material, and a second solvent;

[0026] The opacity of the cigarette paper is greater than or equal to 75%.

[0027] In any embodiment, the first resin includes an alcohol-soluble resin and an ester-soluble resin; the masking layer slurry, by weight percentage, includes the following components: 5%~20% alcohol-soluble resin, 5%~20% ester-soluble resin, 15%~30% masking material, and the balance being the first solvent.

[0028] In any embodiment, the second resin comprises an alcohol-soluble resin and an ester-soluble resin; the whitening slurry comprises, by weight percentage, the following components: 5%~25% alcohol-soluble resin, 5%~25% ester-soluble resin, 10%~35% whitening material, and the balance being a second solvent.

[0029] In any embodiment, after forming the whitening layer, the preparation method further includes the following steps: attaching a varnish slurry to the surface of the whitening layer opposite to the masking layer, and drying it to form a varnish layer; the varnish slurry comprises, by weight percentage, the following components: 5%~30% ester-soluble resin, 0.5%~5% wear-resistant material, and the balance being a third solvent.

[0030] In any embodiment, the first solvent includes an alcohol solvent, and the mass ratio of the alcohol solvent to the alcohol-soluble resin in the masking layer slurry is (3~9):1.

[0031] In any embodiment, the first solvent includes an ester solvent, and the mass ratio of the ester solvent to the ester-soluble resin in the masking layer slurry is (2~8):1.

[0032] In any embodiment, the second solvent includes an alcohol solvent, and the mass ratio of the alcohol solvent to the alcohol-soluble resin in the whitening layer slurry is (3~10):1.

[0033] In any embodiment, the second solvent includes an ester solvent, and the mass ratio of the ester solvent to the ester-soluble resin in the whitening layer slurry is (2~8):1.

[0034] In any embodiment, the third solvent includes an ester solvent, and the mass ratio of the ester solvent to the ester-soluble resin in the varnish slurry is (2~7):1.

[0035] In any embodiment, the first solvent, the second solvent, and the third solvent each independently comprise one or more of ethanol, ethyl acetate, n-butanol, n-butyl ester, propyl acetate, and water.

[0036] In any embodiment, after the whitening layer is formed and before a varnish layer paste is applied to the surface of the whitening layer opposite to the masking layer, the preparation method further includes the step of forming a graphic layer on the whitening layer.

[0037] In any embodiment, the surface density of the shielding layer slurry is 0.3 g / m². 2 ~1.5 g / m 2 .

[0038] In any embodiment, the surface density of the whitening layer slurry is 0.5 g / m². 2 ~2.0 g / m 2 .

[0039] In any embodiment, the surface density of the varnish slurry is 0.5 g / m². 2 ~1.0 g / m 2 .

[0040] In any embodiment, the masking layer paste, the whitening layer paste, and the varnish layer paste are adhered to the substrate by gravure printing; the gravure printing speed is 80 m / min to 120 m / min, and the printing pressure is 0.1 mPa to 0.4 mPa.

[0041] In any embodiment, the drying temperature is 50 ℃ to 100 ℃.

[0042] According to a third aspect of the present invention, a cigarette is provided, comprising cigarette paper according to the first aspect of the present invention, or cigarette paper prepared by the preparation method according to the second aspect of the present invention.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] By setting a masking layer between the substrate and the whitening layer, the masking layer includes a masking material and a first resin, and the whitening layer includes a whitening material and a second resin; the opacity of the cigarette paper is greater than or equal to 75% through the setting of the substrate, masking layer and whitening layer; the resin in the masking layer and whitening layer enables the masking material and whitening material to adhere well to the substrate and has a certain elasticity. When this cigarette paper is used as the tipping paper of cigarettes, it can improve the splicing quality of cigarettes and effectively alleviate the problem of "stuck ends" on the inner side of the tipping paper of cigarettes (especially heated non-combustible cigarettes) causing wrinkles, curling edges and air leakage of the tipping paper; the masking material in the masking layer can increase the opacity of the cigarette paper and mask the "stuck ends" on its inner side, thereby improving the appearance of the cigarette.

[0045] In addition, the whitening layer uses light calcium carbonate, zinc oxide, barium oxide and talc as whitening materials, and does not use titanium dioxide as a whitening agent. This ensures that the whiteness of the cigarette paper meets the requirements, and that the cigarette paper can meet foreign requirements. Attached Figure Description

[0046] To better describe and illustrate the embodiments or examples provided by the present invention, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed invention, the currently described embodiments or examples, or the best mode of these inventions as currently understood. Furthermore, throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0047] Figure 1 This is a schematic diagram of the structure of cigarette paper according to an embodiment of the present invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 10. Cigarette paper; 11. Substrate; 12. Masking layer; 13. Whitening layer; 14. Graphic layer; 15. Varnish layer. Detailed Implementation

[0050] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in this invention are commercially available or can be prepared by existing methods.

[0052] Currently, heated tobacco products suffer from a serious "fragmentation" problem during production. This means that during the rolling process, some tobacco leaves form thin flakes or fragments that remain on the outside of the filter rod or cooling section, and on the inside of the tipping paper. This "fragmentation" leads to poor splicing, resulting in wrinkled and curled tipping paper, air leakage, and other issues, severely impacting the consumer experience. Furthermore, since heated tobacco products typically use white tipping paper, the "fragmentation" on the inside of the tipping paper causes significant visual quality problems with the cigarette. To address these issues, this invention improves the cigarette paper used to solve the problems of wrinkled and curled tipping paper, air leakage, and poor cigarette appearance.

[0053] Please see Figure 1 An embodiment of the present invention provides a cigarette paper 10, which includes a substrate 11, a masking layer 12, and a whitening layer 13. The masking layer 12 is disposed on the substrate 11, and the components of the masking layer 12 include a masking material and a first resin. The whitening layer 13 is disposed on the surface of the masking layer 12 facing away from the substrate 11, and the components of the whitening layer 13 include a whitening material and a second resin. The opacity of the cigarette paper 10 is greater than or equal to 75%.

[0054] The cigarette paper 10 of the present invention comprises a shielding layer 12 between a substrate 11 and a whitening layer 13, wherein the shielding layer 12 includes a shielding material and a first resin, and the whitening layer 13 includes a whitening material and a second resin; and the opacity of the cigarette paper 10 is greater than or equal to 75% by the provision of the substrate 11, the shielding layer 12 and the whitening layer 13. Thus, the first resin and the second resin in the masking layer 12 and the whitening layer 13 enable the masking material and the whitening material to adhere well to the substrate 11 and have a certain degree of elasticity. When the cigarette paper 10 is used as the tipping paper for cigarettes, it can improve the splicing quality of the cigarettes and effectively alleviate the problem of wrinkles, curling edges, and air leakage caused by the "stuck ends" on the inner side of the tipping paper of cigarettes (especially heated non-combustible cigarettes). The masking material in the masking layer 12 can increase the opacity of the cigarette paper 10 and mask the "stuck ends" on its inner side, thereby improving the appearance of the cigarette. The whitening material in the whitening layer 13 can give the cigarette paper 10 a suitable whiteness.

[0055] In some embodiments, the shielding material in the shielding layer 12 includes one or more of kaolin, zinc oxide, and barium oxide. Using the aforementioned shielding material in the shielding layer 12 enables the cigarette paper 10 to have suitable opacity, effectively shielding the "dust" inside the tipping paper of the heated non-combustible cigarette.

[0056] In some embodiments, the whitening material in the whitening layer 13 includes one or more of light calcium carbonate, zinc oxide, barium oxide, and talc. Heated cigarettes produced by various domestic tobacco companies are typically exported. Traditionally, titanium dioxide is used as a whitening agent in the tipping paper of heated cigarettes to achieve a certain whiteness. On February 18, 2020, the European Commission standardized the classification and labeling of titanium dioxide, confirming that the powder of this substance contains 1% or more particles with a diameter equal to or less than 10 μm and is carcinogenic to humans upon inhalation. Although the EU ban on titanium dioxide expired on August 7, 2022, many European and American countries still prohibit its use as a food additive due to a lack of sufficient evidence to prove its safety for consumption. Therefore, the whitening layer 13 of this invention uses light calcium carbonate, zinc oxide, barium oxide, and talc as whitening materials. The whitening layer 13 may not contain titanium dioxide and can still achieve a suitable whiteness for the cigarette paper 10.

[0057] In some embodiments, the opacity of the cigarette paper 10 is 75% to 85%. It is understood that the opacity of the cigarette paper 10 can be further controlled to 75% to 85% by adjusting the amount of masking and whitening materials in the masking layer 12 and the whitening layer 13, as well as the coating thickness of the pulp in the masking layer 12 and the whitening layer 13. Controlling the opacity of the cigarette paper 10 to 75% to 85% further improves the appearance of the cigarette when used as tipping paper.

[0058] In some embodiments, the first resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the masking material, alcohol-soluble resin, and ester-soluble resin in the masking layer 12 is (15~30):(5~20):(5~20). Thus, by using the masking material, alcohol-soluble resin, and ester-soluble resin in the above-described ratio, the masking material can be well adhered to the substrate 11, and the splicing quality of the cigarette can be improved.

[0059] In some embodiments, the second resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the whitening material, alcohol-soluble resin, and ester-soluble resin in the whitening layer 13 is (10~35):(5~25):(5~25). Thus, by using the whitening material, alcohol-soluble resin, and ester-soluble resin in the above ratio, the whitening material can be well adhered to the substrate 11, and the splicing quality of the cigarette can be improved.

[0060] In some embodiments, the alcohol-soluble resin includes one or more of polyvinyl butyral resin, alcohol-soluble polyurethane resin, rosin resin, and alcohol-soluble nitrocellulose resin.

[0061] In some embodiments, the ester-soluble resin includes one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin.

[0062] In some embodiments, the viscosity of both alcohol-soluble and ester-soluble resins, measured using a British 2# cup at 25 °C, is between 2 and 15 seconds. During the smoking process of heated tobacco products, the cigarette paper 10 is heated. Experiments have shown that if a resin with high viscosity is used, it is prone to pyrolysis during heating, producing an off-odor. This invention, by using a resin with the aforementioned viscosity, achieves both good adhesion and avoids pyrolysis that could lead to off-odors.

[0063] It is understood that the viscosity of alcohol-soluble resin measured using a British standard No. 2 cup at 25 ℃ can be, but is not limited to, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, 10 seconds, 11 seconds, 12 seconds, 13 seconds, 14 seconds, and 15 seconds; similarly, the viscosity of ester-soluble resin measured using a British standard No. 2 cup at 25 ℃ can be, but is not limited to, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, 10 seconds, 11 seconds, 12 seconds, 13 seconds, 14 seconds, and 15 seconds.

[0064] In some embodiments, the substrate 11 is made of impermeable base paper, and the basis weight of the substrate 11 is 20 g / m². 2 ~40 g / m 2 It is understood that the basis weight of substrate 11 can be, but is not limited to, 20 g / m³. 2 21 g / m 2 22 g / m 2 23 g / m 2 24 g / m 2 25g / m 2 26 g / m 2 27 g / m 2 28 g / m 2 29 g / m 2 30 g / m 2 31 g / m 2 32 g / m 2 33 g / m 2 34 g / m 2 35g / m 2 36 g / m 2 37 g / m 238 g / m 2 39 g / m 2 40 g / m 2 .

[0065] In some embodiments, the cigarette paper 10 further includes a varnish layer 15, which is disposed on the surface of the whitening layer 13 opposite to the shielding layer 12. The varnish layer 15 comprises an abrasion-resistant material and an ester-soluble resin, wherein the abrasion-resistant material includes polyethylene wax. By providing the aforementioned varnish layer 15 on the surface of the whitening layer 13 opposite to the shielding layer 12, not only is the brightness of the cigarette paper 10 improved, but the cigarette paper 10 also exhibits better adhesion during cigarette rolling.

[0066] In some embodiments, the cigarette paper 10 further includes a graphic layer 14 disposed between the whitening layer 13 and the varnish layer 15. By disposing the graphic layer 14 between the whitening layer 13 and the varnish layer 15, specific text and patterns can be displayed on the cigarette paper 10. It is understood that the graphic layer 14 can be formed after the whitening layer 13 is prepared, by printing the desired text and patterns onto the whitening layer 13.

[0067] An embodiment of the present invention provides a method for preparing the above-mentioned cigarette paper 10, the method comprising the following steps:

[0068] Step S100: Provide substrate 11.

[0069] The substrate 11 serves as the base material for cigarette paper 10, providing a base for coating the pulp of the masking layer 12, whitening layer 13, and varnish layer 15 in cigarette paper 10.

[0070] In some embodiments, the substrate 11 is made of impermeable paper. This prevents the slurry from seeping onto the other surface of the substrate 11 when it is applied to one surface.

[0071] In some embodiments, the basis weight of the substrate 11 is 20 g / m³. 2 ~40 g / m 2 .

[0072] Step S200: Apply a masking layer paste to at least one surface of the substrate 11 and dry it to form a masking layer 12.

[0073] Typically, a masking layer slurry is applied to one of the surfaces of the substrate 11. The masking layer slurry includes an alcohol-soluble resin, an ester-soluble resin, a masking material, and a first solvent. After the first solvent in the masking layer slurry is removed by drying, a masking layer 12 can be formed on the surface of the substrate 11.

[0074] By applying and drying a slurry to form a masking layer 12 containing alcohol-soluble resin, ester-soluble resin, and masking material on the surface of the substrate 11, the opacity of the cigarette paper 10 can be improved. When the cigarette paper 10 is used as the tipping paper for cigarettes, it can effectively mask the "clumps" on the inside of the cigarette tipping paper. At the same time, the alcohol-soluble resin and ester-soluble resin in the masking layer 12 can make the masking material adhere well to the substrate and have a certain elasticity, which can improve the splicing quality of the cigarette and effectively alleviate the problems of wrinkles, curling edges, and air leakage caused by the "clumps" on the inside of the cigarette tipping paper.

[0075] In some embodiments, the masking layer slurry comprises, by weight percentage, the following components: 5% to 20% alcohol-soluble resin, 5% to 20% ester-soluble resin, 15% to 30% masking material, and the balance being a first solvent.

[0076] It is understood that the content of alcohol-soluble resin in the masking layer slurry can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, and 20%; the content of ester-soluble resin can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, and 20%; and the content of masking material can be, but is not limited to, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, and 30%.

[0077] In some embodiments, the alcohol-soluble resin in the masking layer slurry is one or more of polyvinyl butyral resin, alcohol-soluble polyurethane resin, rosin resin, and alcohol-soluble nitrocellulose resin; the ester-soluble resin is one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin; and the masking material is one or more of kaolin, zinc oxide, and barium oxide.

[0078] In some embodiments, the first solvent includes alcohol solvents and ester solvents. Specifically, the mass ratio of alcohol solvent to alcohol-soluble resin in the masking layer slurry is (3-9):1; the mass ratio of ester solvent to ester-soluble resin is (2-8):1. This allows for better dissolution and dispersion of the alcohol-soluble and ester-soluble resins.

[0079] It is understood that the mass ratio of alcohol solvent to alcohol-soluble resin in the masking layer slurry can be, but is not limited to, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, or 9:1; similarly, the mass ratio of ester solvent to ester-soluble resin can be, but is not limited to, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, or 8:1.

[0080] In some embodiments, the alcohol solvent in the first solvent may be one or more of ethanol and n-butanol; the ester solvent may be one or more of ethyl acetate, n-butyl acetate and propyl acetate; and the first solvent may also contain water.

[0081] In some embodiments, the surface density of the masking layer slurry is 0.3 g / m². 2 ~1.5 g / m 2 By controlling the surface density of the masking layer slurry within the aforementioned range, the masking layer 12 can achieve a suitable thickness, providing good masking effect and preventing wrinkles, curling, and air leakage from the "intercalation" on the inner side of the packaging paper. It is understood that the surface density of the masking layer slurry can be, but is not limited to, 0.3 g / m². 2 0.4 g / m 2 0.5 g / m 2 0.6 g / m 2 0.7 g / m 2 0.8 g / m 2 0.9g / m 2 1.0 g / m 2 1.1 g / m 2 1.2 g / m 2 1.3 g / m 2 1.4 g / m 2 1.5 g / m 2 .

[0082] In some embodiments, the roll of substrate 11 is placed on an unwinding roller for unwinding, and a masking layer paste is applied to the substrate 11 using a gravure printing machine. After drying to form the masking layer 12, it is wound up using a take-up roller. The gravure printing speed is 80 m / min to 120 m / min, the printing pressure is 0.1 mPa to 0.4 mPa, the unwinding tension is 0.1 mPa to 0.3 mPa, the take-up tension is 0.1 mPa to 0.3 mPa, and the drying temperature of the masking layer paste is 50 ℃ to 100 ℃.

[0083] It is understood that the printing speed can be, but is not limited to, 80 m / min, 85 m / min, 90 m / min, 95 m / min, 100 m / min, 105 m / min, 110 m / min, 115 m / min, and 120 m / min; the printing pressure can be, but is not limited to, 0.1 mPa, 0.2 mPa, 0.3 mPa, and 0.4 mPa; the unwinding tension can be, but is not limited to, 0.1 mPa, 0.15 mPa, 0.2 mPa, 0.25 mPa, and 0.3 mPa; the rewinding tension can be, but is not limited to, 0.1 mPa, 0.15 mPa, 0.2 mPa, 0.25 mPa, and 0.3 mPa; and the drying temperature can be, but is not limited to, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, and 100 ℃.

[0084] Step S300: Apply whitening paste to the surface of the masking layer 12 away from the substrate 11 and dry to form whitening layer 13.

[0085] By forming a whitening layer 13 on the surface of the masking layer 12 away from the substrate 11 through a slurry coating and drying process, the whiteness of the cigarette paper 10 can be effectively improved, enabling the cigarette paper 10 to better meet the whiteness requirements of tipping paper for heated non-combustible cigarettes. The whitening layer slurry includes an alcohol-soluble resin, an ester-soluble resin, a whitening material, and a second solvent.

[0086] In some embodiments, the whitening layer slurry comprises, by weight percentage, the following components: 5% to 25% alcohol-soluble resin, 5% to 25% ester-soluble resin, 10% to 35% whitening material, and the balance being a second solvent.

[0087] It is understood that the content of alcohol-soluble resin in the whitening layer slurry can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, and 25%; the content of ester-soluble resin can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, and 25%; and the content of whitening material can be, but is not limited to, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, and 35%.

[0088] In some embodiments, the alcohol-soluble resin in the whitening layer slurry is one or more of polyvinyl butyral resin, alcohol-soluble polyurethane resin, rosin resin, and alcohol-soluble nitrocellulose resin; the ester-soluble resin is one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin; and the whitening material is one or more of light calcium carbonate, zinc oxide, barium oxide, and talc.

[0089] In some embodiments, the second solvent includes alcohol solvents and ester solvents. Specifically, the mass ratio of alcohol solvent to alcohol-soluble resin in the whitening layer slurry is (3~10):1; the mass ratio of ester solvent to ester-soluble resin is (2~8):1. This allows for better dissolution and dispersion of the alcohol-soluble and ester-soluble resins.

[0090] It is understood that the mass ratio of alcohol solvent to alcohol-soluble resin in whitening layer slurry can be, but is not limited to, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, or 10:1; similarly, the mass ratio of ester solvent to ester-soluble resin can be, but is not limited to, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, or 8:1.

[0091] In some embodiments, the alcohol solvent in the second solvent may be one or more of ethanol and n-butanol; the ester solvent may be one or more of ethyl acetate, n-butyl acetate and propyl acetate; and the second solvent may also contain water.

[0092] In some embodiments, the surface density of the whitening layer slurry is 0.5 g / m². 2 ~2.0 g / m 2 By controlling the surface density of the whitening layer slurry within the aforementioned range, the whitening layer 13 can have a suitable thickness, and the cigarette paper 10 can have a suitable whiteness. It is understood that the surface density of the whitening layer slurry can be, but is not limited to, 0.5 g / m³. 2 0.6g / m 2 0.7 g / m 2 0.8 g / m 2 0.9 g / m 2 1.0 g / m 2 1.1 g / m 2 1.2 g / m 2 1.3 g / m 2 1.4 g / m 2 1.5g / m 2 1.6 g / m 2 1.7 g / m 2 1.8 g / m 2 1.9 g / m2 2.0 g / m 2 .

[0093] In some embodiments, a whitening layer paste is applied to the masking layer 12 using a gravure printing press, and after drying, a whitening layer 13 is formed. The gravure printing speed is 80 m / min to 120 m / min, the printing pressure is 0.1 mPa to 0.4 mPa, and the drying temperature of the whitening layer paste is 50 ℃ to 100 ℃.

[0094] Step S400: Form the graphic layer 14 on the whitening layer 13.

[0095] After applying a whitening paste to the masking layer 12 and drying it to form a whitening layer 13, the desired patterns and text can be printed on the whitening layer 13 to form a graphic layer 14 on the cigarette paper 10. In this way, specific patterns and text can be formed on the cigarette paper 10 to better meet product requirements.

[0096] Step S500: Apply a varnish slurry to the surface of the whitening layer 13 opposite to the masking layer 12, and dry it to form a varnish layer 15.

[0097] By applying and drying a slurry to form a varnish layer 15 on the surface of the whitening layer 13 away from the masking layer 12, and placing the graphic layer 14 between the whitening layer 13 and the varnish layer 15, the brightness of the cigarette paper 10 can be effectively improved, and the cigarette paper 10 can have a better adhesion effect during the rolling process.

[0098] In some embodiments, the varnish slurry comprises, by weight percentage, the following components: 5%–30% ester-soluble resin, 0.5%–5% abrasion-resistant material, and the balance being a third solvent. The abrasion-resistant material may be polyethylene wax; the ester-soluble resin may be one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin.

[0099] It is understood that the content of ester-soluble resin in the varnish slurry can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, and 30%; and the content of wear-resistant material can be, but is not limited to, 0.5%, 0.8%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, and 5.0%.

[0100] In some embodiments, the third solvent includes an ester-soluble solvent, and the mass ratio of the ester solvent to the ester-soluble resin in the varnish slurry is (2~7):1. This allows the ester-soluble resin to be well dissolved and dispersed. It is understood that the mass ratio of the ester solvent to the ester-soluble resin in the varnish slurry can be, but is not limited to, 2:1, 3:1, 4:1, 5:1, 6:1, or 7:1.

[0101] In some embodiments, the ester solvent in the third solvent may be one or more of ethyl acetate, n-butyl acetate, and propyl acetate.

[0102] In some embodiments, the surface density of the varnish slurry is 0.5 g / m². 2 ~1.0 g / m 2 By controlling the surface density of the varnish paste within the aforementioned range, the varnish layer 15 can have a suitable thickness, resulting in good gloss and adhesion for the cigarette paper 10. It is understood that the surface density of the varnish paste can be, but is not limited to, 0.5 g / m². 2 0.6 g / m 2 0.7 g / m 2 0.8 g / m 2 0.9 g / m 2 1.0 g / m 2 .

[0103] In some embodiments, a varnish paste is applied to the whitening layer 13 and the graphic layer 14 using a gravure printing press. After drying, a varnish layer 15 is formed. Then, a winding roller is used to wind up cigarette paper 10, on one surface of the substrate 11, which has a masking layer 12, a whitening layer 13, a graphic layer 14, and a varnish layer 15 in sequence. The gravure printing speed is 80 m / min to 120 m / min, the printing pressure is 0.1 mPa to 0.4 mPa, and the drying temperature of the varnish paste is 50 ℃ to 100 ℃.

[0104] One embodiment of the present invention provides a cigarette comprising the cigarette paper 10 described above, or cigarette paper 10 prepared by the preparation method described above. In some embodiments, the cigarette paper 10 serves as a tipping paper and / or cigarette paper. The cigarette of the present invention uses the cigarette paper 10 of the present invention. When this cigarette paper 10 is used as a tipping paper, it enables the cigarette (such as a heat-not-burn cigarette) to be well-jointed, reducing the likelihood of wrinkles, curling edges, and air leakage. It effectively covers the "clumps" inside the cigarette tipping paper, improving the appearance of the cigarette. The cigarette paper 10 has high whiteness and does not contain titanium dioxide, meeting international requirements.

[0105] It is understood that the cigarette can be a heated tobacco product or a traditional combustible cigarette; the cigarette paper 10 can be used as tipping paper and / or cigarette paper for heated tobacco products, or as tipping paper and / or cigarette paper for traditional combustible cigarette products. Generally, tipping paper refers to special paper used to attach the cigarette stick and filter together; cigarette paper refers to special paper used to wrap tobacco to form a cigarette stick.

[0106] The present invention will be further described below with reference to specific embodiments and comparative examples, but these should not be construed as limiting the scope of protection of the present invention.

[0107] Example 1:

[0108] 1) Slurry preparation

[0109] By weight percentage, 10% polyvinyl butyral resin, 10% cellulose acetate butyrate resin, 20% kaolin, 20% ethyl acetate and 40% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0110] By weight percentage, 15% polyvinyl butyral resin, 5% cellulose acetate butyrate resin, 20% light calcium carbonate, 20% ethyl acetate and 40% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0111] By weight percentage, 18% cellulose acetate butyrate resin, 25% ethyl acetate, 56.5% ethanol and 0.5% polyethylene wax are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0112] 2) Printed coating

[0113] The base paper used is impermeable tipping paper, with a basis weight of 35 g / m². 2 The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.2 mPa and a coating density of 1.0 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0114] A whitening paste was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening paste was 0.2 mPa, and the coating density was 1.5 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0115] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.2 mPa, and the coating surface density is 1.0 g / m². 2After drying at 70 ℃, a varnish layer is formed; then it is slit to obtain cigarette paper.

[0116] Example 2:

[0117] 1) Slurry preparation

[0118] By weight percentage, 5% alcohol-soluble polyurethane resin, 10% cellulose acetate butyrate resin, 20% kaolin, 20% ethyl acetate and 45% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0119] By weight percentage, 10% polyvinyl butyral resin, 10% cellulose acetate butyrate resin, 20% zinc oxide, 20% ethyl acetate and 40% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0120] By weight percentage, 10% cellulose acetate butyrate resin, 20% ethyl acetate, 69% ethanol and 1% polyethylene wax are added to the container in sequence, and the materials are completely dissolved and stirred evenly to obtain the varnish slurry.

[0121] 2) Printed coating

[0122] The base paper used is impermeable tipping paper, with a basis weight of 37 g / m². 2 The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating density of 1.0 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0123] A whitening paste was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening paste was 0.3 mPa, and the coating density was 1.0 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0124] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed; then it is slit to obtain cigarette paper.

[0125] Example 3:

[0126] 1) Slurry preparation

[0127] By weight percentage, 7% alcohol-soluble polyurethane resin, 8% cellulose acetate butyrate resin, 25% kaolin, 20% ethyl acetate and 60% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0128] By weight percentage, 5% polyvinyl butyral resin, 15% cellulose acetate butyrate resin, 20% light calcium carbonate, 15% ethyl acetate and 45% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0129] By weight percentage, 15% cellulose acetate butyrate resin, 25% ethyl acetate, 59% ethanol and 1% polyethylene wax are added sequentially to a container to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0130] 2) Printed coating

[0131] The base paper used is impermeable tipping paper, with a basis weight of 38 g / m². 2 The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating density of 1.5 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0132] A whitening agent was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening agent was 0.3 mPa, and the coating density was 1.5 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0133] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed, and the paper is then slit to obtain cigarette paper.

[0134] Example 4:

[0135] 1) Slurry preparation

[0136] By weight percentage, 7% alcohol-soluble polyurethane resin, 8% cellulose acetate butyrate resin, 25% kaolin, 20% ethyl acetate and 60% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0137] By weight percentage, 5% polyvinyl butyral resin, 15% cellulose acetate butyrate resin, 20% light calcium carbonate, 15% ethyl acetate and 45% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0138] By weight percentage, 15% cellulose acetate butyrate resin, 25% ethyl acetate, 59% ethanol and 1% polyethylene wax are added sequentially to a container to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0139] 2) Printed coating

[0140] The base paper used is impermeable tipping paper, with a basis weight of 38 g / m². 2 The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating density of 1.0 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0141] A whitening agent was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening agent was 0.3 mPa, and the coating density was 1.5 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0142] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed, and the paper is then slit to obtain cigarette paper.

[0143] Example 5:

[0144] 1) Slurry preparation

[0145] By weight percentage, 7% alcohol-soluble polyurethane resin, 8% cellulose acetate butyrate resin, 25% kaolin, 20% ethyl acetate and 60% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0146] By weight percentage, 5% polyvinyl butyral resin, 15% cellulose acetate butyrate resin, 20% light calcium carbonate, 15% ethyl acetate and 45% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0147] By weight percentage, 15% cellulose acetate butyrate resin, 25% ethyl acetate, 59% ethanol and 1% polyethylene wax are added sequentially to a container to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0148] 2) Printed coating

[0149] The base paper used is impermeable tipping paper, with a basis weight of 38 g / m². 2The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating surface density of 0.8 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0150] A whitening agent was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening agent was 0.3 mPa, and the coating density was 1.5 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0151] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed, and the paper is then slit to obtain cigarette paper.

[0152] Example 6:

[0153] 1) Slurry preparation

[0154] By weight percentage, 7% alcohol-soluble polyurethane resin, 8% cellulose acetate butyrate resin, 25% kaolin, 20% ethyl acetate and 60% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0155] By weight percentage, 5% polyvinyl butyral resin, 15% cellulose acetate butyrate resin, 20% light calcium carbonate, 15% ethyl acetate and 45% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0156] By weight percentage, 15% cellulose acetate butyrate resin, 25% ethyl acetate, 59% ethanol and 1% polyethylene wax are added sequentially to a container to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0157] 2) Printed coating

[0158] The base paper used is impermeable tipping paper, with a basis weight of 38 g / m². 2 The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating density of 1.5 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0159] A whitening agent was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening agent was 0.3 mPa, and the coating density was 2.0 g / m². 2A whitening layer is formed after drying at 70 ℃;

[0160] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed, and the paper is then slit to obtain cigarette paper.

[0161] Example 7:

[0162] 1) Slurry preparation

[0163] By weight percentage, 7% alcohol-soluble polyurethane resin, 8% cellulose acetate butyrate resin, 25% kaolin, 20% ethyl acetate and 60% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain the masking layer slurry.

[0164] By weight percentage, 5% polyvinyl butyral resin, 15% cellulose acetate butyrate resin, 20% light calcium carbonate, 15% ethyl acetate and 45% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0165] By weight percentage, 15% cellulose acetate butyrate resin, 25% ethyl acetate, 59% ethanol and 1% polyethylene wax are added sequentially to a container to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0166] 2) Printed coating

[0167] The base paper used is impermeable tipping paper, with a basis weight of 38 g / m². 2 The gravure printing speed was controlled at 100 m / min; a masking layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating density of 1.5 g / m². 2 After drying at 70 ℃, a shielding layer is formed;

[0168] A whitening layer paste was applied to the surface of the masking layer facing away from the substrate. The printing pressure of the whitening layer paste was 0.3 mPa, and the coating density was 0.8 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0169] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed, and the paper is then slit to obtain cigarette paper.

[0170] Comparative Example 1:

[0171] The preparation method of the cigarette paper in this comparative example is similar to that in Examples 1-7, the main difference being that: in Comparative Example 1, no masking layer was applied; instead, the whitening layer, graphic layer, and varnish layer were directly printed and coated. In this example, titanium dioxide was used as the main whitening agent in the whitening layer. The preparation method of the cigarette paper in Comparative Example 1 is as follows:

[0172] 1) Slurry preparation

[0173] By weight percentage, 5% polyvinyl butyral resin, 15% cellulose acetate butyrate resin, 20% titanium dioxide, 10% calcium carbonate, 10% ethyl acetate and 40% ethanol are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a whitening slurry.

[0174] By weight percentage, 18% cellulose acetate butyrate resin, 25% ethyl acetate, 56.5% ethanol and 0.5% polyethylene wax are added to a container in sequence to completely dissolve the materials and stir evenly to obtain a varnish slurry.

[0175] 2) Printed coating

[0176] The base paper used is impermeable tipping paper, with a basis weight of 38 g / m². 2 The gravure printing speed was controlled at 100 m / min; a whitening layer paste was first applied to one surface of the substrate, with a printing pressure of 0.3 mPa and a coating density of 1.5 g / m². 2 A whitening layer is formed after drying at 70 ℃;

[0177] A graphic layer is printed on the whitening layer; then a varnish layer paste is printed on the graphic layer. The printing pressure of the varnish layer paste is 0.3 mPa, and the coating surface density is 1.0 g / m². 2 After drying at 70 ℃, a varnish layer is formed; then it is slit to obtain cigarette paper.

[0178] Performance testing

[0179] 1) Whiteness and fluorescence whiteness test

[0180] The whiteness and fluorescent whiteness of cigarette paper can be tested according to the method in GB / T7974.

[0181] 2) Opacity test

[0182] The opacity of cigarette paper is tested using a whiteness tester. Specific testing methods can be found in GB / T1543-2005.

[0183] 3) Cigarette paper flatness test

[0184] Five sheets (50 mm × 50 mm) of cigarette paper samples were randomly selected from each embodiment and comparative example. Each sample was placed with the printed side facing up on a flat table. In an environment with a temperature of 50 ℃ and a humidity of 80%, the distance from the highest point of warping or deformation to the horizontal plane was measured using a steel ruler. The average value was taken as the warping height. A larger warping height indicates poorer flatness. A cigarette paper sample with a warping height less than or equal to 5 mm was considered "flat," and a warping height greater than 5 mm was considered "uneven."

[0185] 4) Judgment based on whether it can cover thin fragments

[0186] Whether cigarette paper used as tipping paper for heated non-combustible cigarettes can cover thin flakes and fragments is mainly determined by visual observation; if the thin flakes and fragments on the inside of the tipping paper cannot be clearly seen, it is considered "yes"; if the thin flakes and fragments on the inside of the tipping paper can be clearly seen, it is considered "no".

[0187] The whiteness, fluorescent whiteness, opacity, and smoothness of the cigarette paper prepared in the above embodiments and comparative examples were tested. Heated tobacco products were prepared using the cigarette paper prepared in the above embodiments and comparative examples as tipping paper, and the effect of the tipping paper in covering flakes and debris was evaluated. The test data and evaluation results are shown in Table 1.

[0188] Table 1

[0189]

[0190] As shown in Table 1, the cigarette paper prepared in each embodiment of the present invention has good flatness, and the resin used in the masking layer, whitening layer, and varnish layer of the cigarette paper has a certain elasticity, which allows for good cigarette splicing when used as tipping paper for heated tobacco products. The tipping paper has suitable opacity, which can effectively cover the thin flakes and debris on the inside of the tipping paper, thus improving the appearance quality of the heated tobacco products. Furthermore, the cigarette paper prepared in each embodiment of the present invention has high whiteness and does not contain titanium dioxide whitening agent. In contrast, the cigarette paper prepared in Comparative Example 1 does not have a masking layer, and when used as tipping paper for heated tobacco products, it cannot effectively cover the thin flakes and debris on the inside of the tipping paper, affecting the appearance quality of the heated tobacco products.

[0191] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0192] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A type of heat-not-burn cigarette paper, characterized in that, include: Substrate; A shielding layer is disposed on the substrate, the components of the shielding layer include a shielding material and a first resin, the shielding material including one or more of kaolin, zinc oxide and barium oxide; and A whitening layer is disposed on the surface of the masking layer opposite to the substrate. The components of the whitening layer include a whitening material and a second resin. The whitening material includes one or more of light calcium carbonate, zinc oxide, barium oxide, and talc. The opacity of the heated non-combustible cigarette paper is greater than or equal to 75%. The first resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the masking material, the alcohol-soluble resin, and the ester-soluble resin in the masking layer is (15~30):(5~20):(5~20); the second resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the whitening material, the alcohol-soluble resin, and the ester-soluble resin in the whitening layer is (10~35):(5~25):(5~25); the viscosity of both the first resin and the second resin, measured using a British 2# cup at 25 °C, is 2 seconds to 15 seconds. The alcohol-soluble resin includes one or more of polyvinyl butyral resin, alcohol-soluble polyurethane resin, rosin resin, and alcohol-soluble nitrocellulose resin; the ester-soluble resin includes one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin.

2. The heat-not-burn cigarette paper according to claim 1, characterized in that, The opacity of the heated non-combustible cigarette paper is 75% to 85%.

3. The heat-not-burn cigarette paper according to claim 1, characterized in that, The substrate is an impermeable base paper with a basis weight of 20 g / m². 2 ~40 g / m 2 .

4. The heat-not-burn cigarette paper according to any one of claims 1 to 3, characterized in that, The heated non-combustible cigarette paper also includes a varnish layer, which is disposed on the surface of the whitening layer opposite to the shielding layer. The varnish layer comprises abrasion-resistant materials and ester-soluble resins, and the abrasion-resistant materials include polyethylene wax.

5. The heat-not-burn cigarette paper according to claim 4, characterized in that, The heated non-combustible cigarette paper also includes a graphic layer, which is disposed between the whitening layer and the varnish layer.

6. A method for preparing heat-resistant, non-combustible cigarette paper, characterized in that, Includes the following steps: Provide base materials; A masking layer slurry is applied to at least one surface of the substrate and dried to form a masking layer; the masking layer slurry comprises a first resin, a masking material, and a first solvent, wherein the masking material comprises one or more of kaolin, zinc oxide, and barium oxide; A whitening layer slurry is attached to the surface of the shielding layer opposite to the substrate and dried to form a whitening layer; the whitening layer slurry includes a second resin, a whitening material, and a second solvent, wherein the whitening material includes one or more of light calcium carbonate, zinc oxide, barium oxide, and talc. The opacity of the heated non-combustible cigarette paper is greater than or equal to 75%. The first resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the masking material, the alcohol-soluble resin, and the ester-soluble resin in the masking layer is (15~30):(5~20):(5~20); the second resin comprises an alcohol-soluble resin and an ester-soluble resin, and the mass ratio of the whitening material, the alcohol-soluble resin, and the ester-soluble resin in the whitening layer is (10~35):(5~25):(5~25). The viscosity of both the first resin and the second resin, measured using a British 2# cup at 25 °C, is 2 seconds to 15 seconds. The masking layer slurry comprises, by weight percentage, the following components: 5% to 20% alcohol-soluble resin, 5% to 20% ester-soluble resin, 15% to 30% masking material, and the balance being the first solvent. The whitening layer slurry comprises, by weight percentage, the following components: 5% to 25% alcohol-soluble resin, 5% to 25% ester-soluble resin, 10% to 35% whitening material, and the balance being the second solvent. The alcohol-soluble resin includes one or more of polyvinyl butyral resin, alcohol-soluble polyurethane resin, rosin resin, and alcohol-soluble nitrocellulose resin; the ester-soluble resin includes one or more of ester-soluble acrylic resin, cellulose acetate butyrate resin, ester-soluble polyurethane resin, and ester-soluble nitrocellulose resin.

7. The method for preparing heat-not-burn cigarette paper according to claim 6, characterized in that, After forming the whitening layer, the preparation method further includes the following steps: A varnish slurry is applied to the surface of the whitening layer opposite to the masking layer and dried to form a varnish layer; the varnish slurry comprises the following components by weight percentage: 5%~30% ester-soluble resin, 0.5%~5% abrasion-resistant material, and the balance being a third solvent.

8. The method for preparing heat-not-burn cigarette paper according to claim 7, characterized in that, The first solvent, the second solvent, and the third solvent each independently comprise one or more of ethanol, ethyl acetate, n-butanol, n-butyl ester, propyl acetate, and water.

9. The method for preparing heat-not-burning cigarette paper according to claim 7, characterized in that, The preparation method satisfies at least one of the following (1) to (5): (1) The first solvent includes an alcohol solvent, and the mass ratio of the alcohol solvent to the alcohol-soluble resin in the masking layer slurry is (3~9):1; (2) The first solvent includes an ester solvent, and the mass ratio of the ester solvent to the ester-soluble resin in the masking layer slurry is (2~8):1; (3) The second solvent includes an alcohol solvent, and the mass ratio of the alcohol solvent to the alcohol-soluble resin in the whitening layer slurry is (3~10):1; (4) The second solvent includes an ester solvent, and the mass ratio of the ester solvent to the ester-soluble resin in the whitening layer slurry is (2~8):1; (5) The third solvent includes ester solvents, and the mass ratio of the ester solvent to the ester-soluble resin in the varnish slurry is (2~7):

1.

10. The method for preparing heat-not-burn cigarette paper according to claim 7, characterized in that, After the whitening layer is formed, and before a varnish layer paste is applied to the surface of the whitening layer opposite to the masking layer, the preparation method further includes the step of forming a graphic layer on the whitening layer.

11. The method for preparing heat-not-burn cigarette paper according to any one of claims 7 to 10, characterized in that, The preparation method satisfies at least one of the following (1) to (5): (1) The surface density of the shielding layer slurry is 0.3 g / m². 2 ~1.5 g / m 2 ; (2) The surface density of the whitening slurry is 0.5 g / m². 2 ~2.0 g / m 2 ; (3) The surface density of the varnish slurry is 0.5 g / m². 2 ~1.0 g / m 2 ; (4) The masking layer paste, the whitening layer paste and the varnish layer paste are adhered to the substrate by gravure printing; the printing speed of the gravure printing is 80 m / min to 120 m / min and the printing pressure is 0.1 mPa to 0.4 mPa. (5) The drying temperature is 50 ℃~100 ℃.

12. A heated non-combustible cigarette, characterized in that, It includes the heat-not-burn cigarette paper according to any one of claims 1 to 5, or the heat-not-burn cigarette paper prepared by the preparation method according to any one of claims 6 to 11.

13. The heated non-combustible cigarette according to claim 12, characterized in that, The heated tobacco paper serves as the tipping paper for the heated tobacco.

Images