Wrapping sheet for high-temperature-resistant cigarette as well as preparation method and application of wrapping sheet
By preparing high-temperature resistant cigarette paper through the composite of aramid fiber and plant fiber layers, the problems of carbonization and odor in externally heated cigarette paper at high temperatures are solved, achieving good appearance and sensory quality while reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANTONG CIGARETTE FILTER
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-12
AI Technical Summary
Existing cigarette paper cannot effectively withstand high temperatures of 250-300℃ under external heating mode, causing paper odors to mix into the smoke, affecting the sensory quality of smoking and causing the cigarette to turn black. Furthermore, existing high-temperature resistant materials are not widely used in the cigarette industry.
High-temperature resistant cigarette wrapping sheets are prepared by combining aramid fiber layers and plant fiber layers. The aramid fiber layer uses chopped aramid fibers as the skeleton and aramid pulp as the filler and binder. The dense thermal barrier is formed through physical interweaving. The plant fiber layer provides a complementary fiber network, which reduces porosity and paper odor.
It effectively resists carbonization in high-temperature environments, reduces odor, maintains good appearance quality, and lowers costs.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of high-temperature resistant composite paper, specifically relating to a high-temperature resistant cigarette wrapping sheet, its preparation method, and its application. Background Technology
[0002] Peripherally heated cigarettes achieve inhalation by heating the tobacco cartridge circumferentially. Compared to center-heated cigarettes, this method has a larger heating area and faster heat transfer. However, this heating mode also presents unique technical challenges: heat must penetrate the two layers of cigarette paper and forming paper sequentially from the outside to reach the inner tobacco sheet. During this process, the cigarette paper and forming paper are directly exposed to a high-temperature environment of 250-300℃ (typically rapidly heated within 10 seconds and maintained for 3-5 minutes), causing the paper itself to be baked or even carbonized. This not only produces a noticeable papery odor that mixes with the smoke and affects the sensory quality of the smoke, but also causes localized blackening of the cigarette's appearance, severely impacting the consumer experience.
[0003] Current research on high-temperature resistant paper mainly focuses on fields such as industrial insulation materials, electronic tags, and aerospace composite materials. The technical approaches primarily utilize inorganic fibers such as glass fiber, aluminosilicate fiber, and carbon fiber, or achieve temperature resistance through coating with high-temperature resistant coatings and adhesives. In the cigarette industry, existing technologies only focus on the printing temperature resistance (approximately 180°C) of tipping paper. Traditional cigarette paper, because it participates in combustion or is only used for central heating, does not face the high-temperature resistance requirements under peripheral heating modes.
[0004] Although aramid fibers have been widely used in high-temperature resistant fields such as aerospace and insulation materials, research on their application in cigarette paper is still lacking. Their thermal behavior under heated cigarette conditions, their impact on smoke composition, and how to balance high-temperature resistance and sensory quality have not been systematically studied.
[0005] Therefore, how to develop a cigarette paper that combines excellent high-temperature resistance, low smoke release, and good appearance retention to meet the special needs of externally heated cigarettes is a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a high-temperature resistant cigarette wrapping sheet, its preparation method and application.
[0007] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a high-temperature resistant cigarette wrapping sheet, the high-temperature resistant cigarette wrapping sheet comprising a laminated aramid fiber layer and a plant fiber layer; the raw materials for preparing the aramid fiber layer include: meta-aramid short-cut fibers, aramid pulp and chemical auxiliaries; the raw materials for preparing the plant fiber layer include: plant fibers and chemical auxiliaries.
[0008] This invention uses aramid fibers to prepare a high-temperature resistant layer. The aramid fiber layer uses chopped aramid fibers as the skeleton and aramid pulp as the filler and binder, which are physically interwoven and formed. The two work together and enhance each other, which can significantly improve the tensile index of the sheet and significantly reduce the porosity, forming a dense "thermal barrier". Then, it is combined with a plant fiber layer to prepare a high-temperature resistant cigarette wrapping sheet, which better constructs a complementary fiber network, reduces paper odor and reduces costs. The high-temperature resistant cigarette wrapping sheet prepared by this invention can be used for heated cigarettes. It can still maintain a good appearance after being heated and smoked, and can effectively resist carbonization and reduce odor.
[0009] Preferably, the raw materials for preparing the aramid fiber layer include, by weight, 3-15 parts (e.g., 3, 5, 7, 10, 12, 15, etc.) of meta-aramid chopped fibers, 15-30 parts (e.g., 15, 17, 20, 22, 25, 27, 30, etc.) of aramid pulp, and 0.5-5 parts of chemical auxiliaries (e.g., 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.).
[0010] The raw materials for preparing the plant fiber layer include, by weight, 40-60 parts of plant fiber (e.g., 40, 45, 50, 55, 60, etc.) and 0.5-5 parts of chemical auxiliaries (e.g., 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.).
[0011] Preferably, the aramid fiber layer and plant fiber layer of the high-temperature resistant cigarette wrapping sheet each independently include 1-10 parts (e.g., 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.) of inorganic filler.
[0012] Preferably, the inorganic filler is selected from any one or a combination of at least two of titanium dioxide, calcium carbonate, kaolin, talc, wollastonite, diatomaceous earth, bentonite, and barium sulfate.
[0013] Preferably, the inorganic filler is selected from a combination of titanium dioxide and calcium carbonate.
[0014] Preferably, the aramid pulp is selected from para-aramid pulp and / or meta-aramid pulp.
[0015] Preferably, the plant fiber is selected from any one or a combination of at least two of the following: softwood pulp, hardwood pulp, cotton pulp, straw pulp, hemp pulp, bamboo pulp, and bagasse pulp.
[0016] Preferably, the plant fiber is selected from a combination of softwood pulp, hemp pulp, and bagasse pulp.
[0017] Softwood pulp, hemp pulp, and bagasse pulp are used together as plant fibers in high-temperature resistant cigarette wrapping sheets. Softwood pulp provides skeletal support to ensure the strength of the paper base; hemp pulp enhances interweaving and tear resistance; bagasse pulp can fill gaps, improve the uniformity and density of the paper sheet, and at the same time improve the paper quality of the fiber layer. The three work together to optimize the sensory properties of the sheet.
[0018] Preferably, the mass ratio of the softwood pulp, hemp pulp, and bagasse pulp is 1:(0.5-3):(0.5-3) (the specific value of 0.5-3 can be 0.5, 1, 1.5, 2, 2.5, 3, etc.).
[0019] Preferably, the chemical auxiliaries of the aramid fiber layer and the plant fiber layer are each independently selected from any one or a combination of at least two of the following: cationic starch, polyacrylamide, polyethyleneimine, polyethylene oxide, alkyl ketone dimer, alkenyl succinic anhydride, rosin gum, modified starch, polyvinyl alcohol, urea-formaldehyde resin, melamine-formaldehyde resin, hexadecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, and organosilicon.
[0020] Preferably, the chemical auxiliaries of the aramid fiber layer and the plant fiber layer are each independently selected from a combination of cationic starch and polyethylene oxide.
[0021] Preferably, the mass ratio of the cationic starch and polyethylene oxide is independently 1:(0.5-3) (the specific value of 0.5-3 can be 0.5, 1, 1.5, 2, 2.5, 3, etc.).
[0022] In a second aspect, the present invention provides a method for preparing a high-temperature resistant cigarette wrapping sheet as described in the first aspect, the method comprising: (1) Mix meta-aramid short-cut fibers, aramid pulp and water to make a slurry, and then mix it with chemical auxiliaries and inorganic fillers to obtain aramid fiber layer slurry; Plant fibers are mixed with water to make a slurry, which is then mixed with chemical additives and inorganic fillers to obtain a plant fiber layer slurry. (2) The aramid fiber layer slurry and the plant fiber layer slurry are formed and compounded by the overlay web forming method, and then pressed, dried, calendered at high temperature and slit to obtain a high temperature resistant cigarette wrapping sheet.
[0023] Preferably, the mixing temperature in step (1) is independently selected from 20-30°C (e.g., 20°C, 22°C, 24°C, 26°C, 28°C, 30°C, etc.).
[0024] Preferably, the mass ratio of the total mass of the aramid short-cut fibers and aramid pulp in the middle position of the aramid fiber layer slurry in step (1) to the mass of water is 0.3-0.8% (for example, it can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, etc.).
[0025] Preferably, the mass ratio of plant fiber to water in the plant fiber layer slurry in step (1) is 0.3-0.8% (e.g., 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, etc.).
[0026] Preferably, step (1) further includes mixing the meta-aramid short-cut fibers, aramid pulp and water to form a slurry, and then mixing it with inorganic fillers.
[0027] Preferably, step (1) further includes mixing the plant fiber with water to form a slurry, and then mixing it with an inorganic filler.
[0028] Preferably, the drying in step (2) is carried out using two sets of drying cylinders. The pressure of the rollers inside the drying cylinder of the first set of drying cylinders is 80-100 kg / cm (for example, it can be 80 kg / cm, 85 kg / cm, 90 kg / cm, 95 kg / cm, 100 kg / cm, etc.), the temperature of the drying cylinder is 110-130℃ (for example, it can be 110℃, 115℃, 120℃, 125℃, 130℃, etc.), and the drying time is 10-20 min (for example, it can be 10 min, 12 min, 14 min, 16 min, 18 min, 20 min, etc.).
[0029] The pressure of the rollers inside the second set of drying cylinders is 40-60 kg / cm (e.g., 40 kg / cm, 45 kg / cm, 50 kg / cm, 55 kg / cm, 60 kg / cm, etc.), the temperature of the second set of drying cylinders is 80-100℃ (e.g., 80℃, 85℃, 90℃, 95℃, 100℃, etc.), and the drying time of the second set of drying cylinders is 20-30 min (e.g., 20 min, 22 min, 24 min, 26 min, 28 min, 30 min, etc.).
[0030] All other specific point values not listed above within the numerical ranges mentioned above can be selected and are all within the protection scope of this invention. For the sake of brevity, they will not be described in detail here.
[0031] Thirdly, the present invention provides an application of the high-temperature resistant cigarette wrapping sheet as described in the first aspect in the preparation of high-temperature resistant packaging paper products.
[0032] Compared with the prior art, the present invention has the following beneficial effects: This invention uses aramid fibers to prepare a high-temperature resistant layer. The aramid fiber layer uses chopped aramid fibers as the skeleton and aramid pulp as the filler and binder, which are physically interwoven and formed. The two work together and enhance each other, which can significantly improve the tensile index of the sheet and significantly reduce the porosity, forming a dense "thermal barrier". Then, it is combined with a plant fiber layer to prepare a high-temperature resistant cigarette wrapping sheet, which better constructs a complementary fiber network, reduces paper odor and reduces costs. The high-temperature resistant cigarette wrapping sheet prepared by this invention can be used for heated cigarettes. It can still maintain a good appearance after being heated and smoked, and can effectively resist carbonization and reduce odor. Attached Figure Description
[0033] Figure 1 This is a schematic diagram of the cigarette structure; Figure 2 A schematic diagram of a smoking device for heating cigarettes. Detailed Implementation
[0034] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.
[0035] Example 1 This embodiment provides a high-temperature resistant cigarette wrapping sheet, the preparation method of which is as follows: (1) At 25°C, 10 parts of meta-aramid short chopped fiber and 16 parts of meta-aramid pulp were mixed with water to prepare a 0.5% concentration slurry, which was then mixed with 1.2 parts of cationic starch and polyethylene oxide in a mass ratio of 1:1 and 1.2 parts of titanium dioxide and calcium carbonate in a mass ratio of 2:1 to obtain aramid fiber layer slurry. At 25℃, 45 parts by mass ratio of softwood pulp, hemp pulp, bagasse pulp and water were mixed to prepare a 0.5% concentration slurry, which was then mixed with 1 part by mass ratio of cationic starch and polyethylene oxide, and 1 part by mass ratio of titanium dioxide and calcium carbonate to obtain a plant fiber layer slurry. (2) The aramid fiber layer slurry and the plant fiber layer slurry are formed and compounded by the overlay web forming method and then pressed. The compounding mass ratio of the aramid fiber layer slurry and the plant fiber layer slurry is 1:1. After pressing, the aramid fiber layer slurry is dried using two sets of drying cylinders. The pressure of the rollers in the drying cylinder of the first set of drying cylinders is set to 100 kg / cm and the drying time is set to 10 min. The pressure of the rollers in the drying cylinder of the second set of drying cylinders is set to 40 kg / cm and the drying time is set to 20 min. After drying, the aramid fiber layer slurry is hot-pressed at high temperature using a high-temperature three-roller soft calender. The hot-pressing temperature is controlled at 240℃ and the hot-pressing pressure is 14 MPa. After slitting, the high-temperature resistant cigarette wrapping sheet is obtained.
[0036] Example 2 This embodiment provides a high-temperature resistant cigarette wrapping sheet, the preparation method of which is as follows: (1) At 25°C, 12 parts of meta-aramid short chopped fiber and 18 parts of meta-aramid pulp were mixed with water to prepare a slurry with a concentration of 0.4%. Then, it was mixed with 1.5 parts of cationic starch and polyethylene oxide in a mass ratio of 1:2 and 1 part of titanium dioxide and calcium carbonate in a mass ratio of 1:1 to obtain aramid fiber layer slurry. At 25℃, 45 parts by mass ratio of softwood pulp, hemp pulp, and bagasse pulp were mixed with water to prepare a 0.4% concentration slurry. Then, it was mixed with 1 part by mass ratio of cationic starch and polyethylene oxide, and 1.5 parts by mass ratio of titanium dioxide and calcium carbonate in a 2:1 ratio to obtain a plant fiber layer slurry. (2) The aramid fiber layer slurry and the plant fiber layer slurry are formed and compounded by the overlay web forming method and then pressed. The compounding mass ratio of the aramid fiber layer slurry and the plant fiber layer slurry is 1:1. After pressing, the slurry is dried using two sets of drying cylinders. The pressure of the rollers in the drying cylinder of the first set of drying cylinders is set to 100 kg / cm and the drying time is set to 10 min. The pressure of the rollers in the drying cylinder of the second set of drying cylinders is set to 40 kg / cm and the drying time is set to 20 min. After drying, the slurry is hot-pressed at high temperature using a high-temperature three-roller soft calender. The hot-pressing temperature is controlled at 220℃ and the hot-pressing pressure is 8 MPa. After slitting, the high-temperature resistant cigarette wrapping sheet is obtained.
[0037] Example 3 This embodiment provides a high-temperature resistant cigarette wrapping sheet, the preparation method of which is as follows: (1) At 25°C, 8 parts of meta-aramid short chopped fiber, 15 parts of meta-aramid pulp and water were mixed to prepare a 0.5% concentration slurry, and then mixed with 1.8 parts of cationic starch and polyethylene oxide in a mass ratio of 1:2, and 1.2 parts of titanium dioxide and calcium carbonate in a mass ratio of 2:1 to obtain aramid fiber layer slurry. At 25℃, 40 parts by mass ratio of softwood pulp, hemp pulp, and bagasse pulp were mixed with water to prepare a 0.5% concentration slurry. Then, it was mixed with 1 part by mass ratio of cationic starch and polyethylene oxide, and 1 part by mass ratio of titanium dioxide and calcium carbonate to obtain a plant fiber layer slurry. (2) The aramid fiber layer slurry and the plant fiber layer slurry are formed and compounded by the overlay web forming method and then pressed. The compounding mass ratio of the aramid fiber layer slurry and the plant fiber layer slurry is 1:1. After pressing, the slurry is dried using two sets of drying cylinders. The pressure of the rollers in the drying cylinder of the first set of drying cylinders is set to 100 kg / cm and the drying time is set to 10 min. The pressure of the rollers in the drying cylinder of the second set of drying cylinders is set to 40 kg / cm and the drying time is set to 20 min. After drying, the slurry is hot-pressed at high temperature using a high-temperature three-roller soft calender. The hot-pressing temperature is controlled at 220℃ and the hot-pressing pressure is 8 MPa. After slitting, the high-temperature resistant cigarette wrapping sheet is obtained.
[0038] Example 4 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The only difference between the preparation method and that of Embodiment 1 is that in step (1), the meta-aramid pulp is replaced with para-aramid pulp in equal proportions, while all other conditions remain unchanged.
[0039] Example 5 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and that of Embodiment 1 is that in step (1), no softwood pulp is added, and the reduced amount of softwood pulp is proportionally allocated to hemp pulp and bagasse pulp, while other conditions remain unchanged.
[0040] Example 6 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and that of Embodiment 1 is that in step (1), hemp pulp is not added, and the reduced amount of hemp pulp is proportionally allocated to softwood pulp and bagasse pulp, while other conditions remain unchanged.
[0041] Example 7 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and that of Embodiment 1 is that bagasse pulp is not added in step (1), and the reduced amount of bagasse pulp is proportionally allocated to softwood pulp and hemp pulp, while other conditions remain unchanged.
[0042] Example 8 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and that of Embodiment 1 is that cationic starch is not added in the preparation of the aramid fiber layer slurry and the plant fiber layer slurry in step (1). The mass reduction of cationic starch is distributed to polyethylene oxide. All other conditions remain unchanged.
[0043] Example 9 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and that of Embodiment 1 is that polyethylene oxide is not added in the preparation of the aramid fiber layer slurry and the plant fiber layer slurry in step (1). The reduced mass of polyethylene oxide is allocated to cationic starch, and other conditions remain unchanged.
[0044] Example 10 This embodiment provides a high-temperature resistant cigarette wrapping sheet. The only difference between the preparation method and that of Embodiment 1 is that step (2) does not involve high-temperature hot pressing, while all other conditions remain unchanged.
[0045] Comparative Example 1 This comparative example provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and Example 1 is that in step (1), meta-aramid short-cut fibers are not added, and the reduced number of meta-aramid short-cut fibers is allocated to the meta-aramid pulp. All other conditions remain unchanged.
[0046] Comparative Example 2 This comparative example provides a high-temperature resistant cigarette wrapping sheet. The difference between the preparation method and Example 1 is that in step (1), meta-aramid pulp is not added, and the reduced amount of meta-aramid pulp is allocated to the meta-aramid short-cut fibers. All other conditions remain unchanged.
[0047] Comparative Example 3 This comparative example provides a plant fiber-based high-temperature resistant cigarette wrapping sheet, the preparation method of which is as follows: (1) At 25°C, 45 parts of softwood pulp, hemp pulp and bagasse pulp in a mass ratio of 1:1:1 were mixed with water to make a 0.5% concentration slurry. Then, it was mixed with 1 part of cationic starch and polyethylene oxide in a mass ratio of 1:1 and 1 part of titanium dioxide and calcium carbonate in a mass ratio of 1:1 to obtain plant fiber layer slurry. (2) The plant fiber layer slurry is formed, pressed and dried by the circular screen forming method. Two sets of drying cylinders are used for drying. The pressure of the rollers in the drying cylinder of the first set of drying cylinders is set to 100 kg / cm and the drying time is set to 10 min. The pressure of the rollers in the drying cylinder of the second set of drying cylinders is set to 40 kg / cm and the drying time is set to 20 min. After drying, the calender is used for calendering. The temperature is controlled at 80℃ and the pressure is 7MPa. After slitting, the plant fiber-based high temperature resistant cigarette wrapping sheet is obtained.
[0048] Test Example 1 This test case evaluates the appearance of the high-temperature resistant cigarette wrapping sheets of Examples 1-3, Example 10, and Comparative Example 3.
[0049] Using the high-temperature resistant cigarette wrapping sheets from Examples 1-3, Example 10, and Comparative Example 3 as cigarette paper, heated cigarettes were prepared using a composite and twisting method: Composite rod 1 was prepared by laminating the plug 101, the core segment 102, and the small-pore filter rod 103 with cigarette paper (the core segment was prepared in advance by wrapping the core sheet with shaped paper); Composite rod 2 was prepared by laminating the large-pore filter rod segment 104 and the filter tip segment 105; Composite rod 1 and Composite rod 2 were twisted together with cork paper to prepare the finished cigarette. Figure 1 This is a schematic diagram of the cigarette structure.
[0050] Heated cigarettes made from traditional cigarette paper were used as a control group.
[0051] The appearance of each group of heated cigarettes was evaluated, and the evaluation results are shown in Table 1. The results showed that the heated cigarettes prepared from the high-temperature resistant cigarette wrapping sheet of the present invention had a good appearance and good opacity, making it difficult to see the gap between the internal wrapping material and the cooling section. Without hot pressing, the surface would be relatively rough because aramid fibers are difficult to bond with plant fibers via hydrogen bonds, resulting in uneven fiber dispersion during small-scale processing, similar to direct processing of mixed fibers. In contrast, the high-temperature resistant cigarette wrapping sheet prepared from pure plant fiber pulp, after being made into heated cigarettes, had a rougher surface and higher light transmittance compared to Examples 1-3.
[0052] Test Example 2 This test example examines the whiteness of cigarette paper for the high-temperature resistant cigarette wrapping sheets of Examples 1-10 and Comparative Examples 1-3.
[0053] The high-temperature resistant cigarette wrapping sheets from Examples 1-10 and Comparative Examples 1-3 were used as cigarette paper, and heated cigarettes were prepared using conventional methods. Following GB / T 7974, the heated cigarette samples from each group were first tested for whiteness using a whiteness meter, and then... Figure 2 The smoking device shown is used to heat and smoke the cigarette samples from the outside of each group. The smoked cigarette paper is then placed in a whiteness meter for testing.
[0054] The maximum external heating temperature is 350℃, and the subsequent long-term heating temperature is controlled at 300℃ (due to air intake, the surface temperature of the cigarette fluctuates between 250 and 300℃). The smoking procedure is as follows: insert the cigarette and press the button to start heating. After the temperature rises to the set temperature, the device vibrates, and you can start smoking. The smoking capacity is 55mL, the smoking time is 2 seconds, the smoking interval is 30 seconds, and the device is powered off after 10 puffs, ending the smoking process.
[0055] The test results are shown in Table 2. The results showed that the heated cigarettes prepared from the high-temperature resistant cigarette wrapping sheet of the present invention still maintained good whiteness after smoking. This is because the aramid fibers have good thermal stability, which effectively prevents carbonization after external heating. The slight decrease in whiteness is due to oxidation and yellowing after heating, and the condensation and adhesion of e-liquid to the surface after heating. If the technical solution of the present invention is changed, such as changing the blend of aramid fibers or plant fibers, or replacing meta-aramid pulp with para-aramid pulp, the whiteness will decrease more significantly compared to the samples of Examples 1-3, resulting in a greater impact on appearance.
[0056] The applicant declares that the technical solution of this invention is illustrated by the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the products of this invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.
[0057] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.
Claims
1. A high-temperature resistant cigarette wrapping sheet, characterized in that, The high-temperature resistant cigarette wrapping sheet includes a layer of aramid fiber and a layer of plant fiber stacked together. The raw materials for preparing the aramid fiber layer include: meta-aramid chopped fibers, aramid pulp, and chemical auxiliaries; The raw materials for preparing the plant fiber layer include: plant fibers and chemical auxiliaries.
2. The high-temperature resistant cigarette wrapping sheet according to claim 1, characterized in that, The raw materials for preparing the aramid fiber layer include, by weight, 3-15 parts meta-aramid chopped fibers, 15-30 parts aramid pulp, and 0.5-5 parts chemical auxiliaries. The raw materials for preparing the plant fiber layer include, by weight, 40-60 parts plant fiber and 0.5-5 parts chemical auxiliaries; Preferably, the aramid fiber layer and plant fiber layer of the high-temperature resistant cigarette wrapping sheet each independently include 1-10 parts of inorganic filler.
3. The high-temperature resistant cigarette wrapping sheet according to claim 2, characterized in that, The inorganic filler is selected from any one or a combination of at least two of the following: titanium dioxide, calcium carbonate, kaolin, talc, wollastonite, diatomaceous earth, bentonite, and barium sulfate. Preferably, the inorganic filler is selected from a combination of titanium dioxide and calcium carbonate.
4. The high-temperature resistant cigarette wrapping sheet according to any one of claims 1-3, characterized in that, The aramid pulp is selected from para-aramid pulp and / or meta-aramid pulp.
5. The high-temperature resistant cigarette wrapping sheet according to any one of claims 1-4, characterized in that, The plant fiber is selected from any one or a combination of at least two of the following: softwood pulp, hardwood pulp, cotton pulp, straw pulp, hemp pulp, bamboo pulp, and bagasse pulp; Preferably, the plant fiber is selected from a combination of softwood pulp, hemp pulp, and bagasse pulp; Preferably, the mass ratio of the softwood pulp, hemp pulp, and bagasse pulp is 1:(0.5-3):(0.5-3).
6. The high-temperature resistant cigarette wrapping sheet according to any one of claims 1-5, characterized in that, The chemical auxiliaries of the aramid fiber layer and the plant fiber layer are each independently selected from any one or a combination of at least two of the following: cationic starch, polyacrylamide, polyethyleneimine, polyethylene oxide, alkyl ketone dimer, alkenyl succinic anhydride, rosin gum, modified starch, polyvinyl alcohol, urea-formaldehyde resin, melamine-formaldehyde resin, hexadecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, and organosilicon. Preferably, the chemical auxiliaries of the aramid fiber layer and the plant fiber layer are each independently selected from a combination of cationic starch and polyethylene oxide; Preferably, the mass ratio of the cationic starch to the polyethylene oxide is 1:(0.5-3).
7. A method for preparing a high-temperature resistant cigarette wrapping sheet according to any one of claims 1-6, characterized in that, The preparation method includes: (1) Mix meta-aramid short-cut fibers, aramid pulp and water to make a slurry, and then mix it with chemical auxiliaries to obtain aramid fiber layer slurry; Plant fibers are mixed with water to make a slurry, which is then mixed with chemical additives to obtain a plant fiber layer slurry. (2) The aramid fiber layer slurry and the plant fiber layer slurry are formed and compounded by the overlay web forming method, and then pressed, dried, calendered at high temperature and slit to obtain a high temperature resistant cigarette wrapping sheet.
8. The preparation method according to claim 7, characterized in that, The mixing temperatures in step (1) are each independently selected from 20-30°C; Preferably, in step (1), the total mass of the aramid fiber layer slurry containing aramid short-cut fibers and aramid pulp accounts for 0.3-0.8% of the mass of water; Preferably, the total mass of plant fibers in the plant fiber layer slurry of step (1) accounts for 0.3-0.8% of the mass of water; Preferably, step (1) further includes mixing the meta-aramid short-cut fibers, aramid pulp and water to form a slurry, and then mixing it with inorganic fillers. Preferably, step (1) further includes mixing the plant fiber with water to form a slurry, and then mixing it with an inorganic filler.
9. The preparation method according to any one of claims 7 or 8, characterized in that, The drying process described in step (2) is carried out using two sets of drying cylinders. The pressure of the rollers inside the drying cylinder of the first set of drying cylinders is 80-100 kg / cm, the temperature of the drying cylinder is 110-130℃, and the drying time is 10-20 min. The pressure of the rollers inside the second set of drying cylinders is 40-60 kg / cm, the temperature of the second set of drying cylinders is 80-100℃, and the drying time of the second set of drying cylinders is 20-30 min.
10. The application of a high-temperature resistant cigarette wrapping sheet according to any one of claims 1-6 in the preparation of high-temperature resistant packaging paper products.