Method for preparing low-entrapment heat-resistant hollow paper stick for heating cigarettes

Abstract

The present invention discloses a method for preparing a low-retention heat-resistant hollow paper rod for heating cigarettes, which belongs to the field of papermaking. The present invention provides a low-retention heat-resistant hollow paper rod for heating cigarettes, which is composed of a first section of hollow paper rod, i.e., a rapid cooling section, and a second section of hollow paper rod, i.e., a high-strength transmission section, in different proportions. The first section of the hollow paper rod is made of plant fiber and regenerated cellulose fiber as raw materials, and a composite phase change material obtained by combining diatomaceous earth with a phase change material is selected as filler to prepare a rapid cooling hollow paper rod section. The composite phase change material can give the paper high-temperature deformation resistance while rapidly cooling, enhance the interaction between the fiber raw material and the high-temperature aerosol, and significantly reduce the discomfort caused by the high-temperature smoke due to the large specific heat capacity of water; the second section of the hollow paper rod is made of plant fiber and regenerated cellulose fiber modified by a heat-resistant additive as raw materials. Through the optimization of beating degree, ratio and chemicals, a transmission hollow paper rod section with high hardness, high strength and high heat resistance is obtained.

Description

Technical Field

[0001] The invention relates to a method for preparing a low-retention, heat-resistant hollow paper rod for heating cigarettes, and belongs to the field of papermaking. Background Art

[0002] The harmful effects of traditional cigarettes on smokers, passive smokers, and the environment have been repeatedly demonstrated, and quitting smoking is a long and difficult process. Therefore, relatively low-harm cigarette alternatives can serve as a more effective transition. Heated cigarettes, which do not require combustion, have attracted widespread attention. Heated cigarettes are tobacco products that heat tobacco materials through a heating element, producing an inhalable aerosol from shredded tobacco or reconstituted tobacco at a relatively low temperature. Compared to traditional cigarettes, these products significantly reduce the amount of harmful substances inhaled.

[0003] The cooling section of a heated cigarette refers to a heated cigarette paper that features thermal conductivity, high toughness, and strength, effectively connecting the cigarette and filter sections and trapping cooling aerosols. The earliest cooling section, based on pleated polylactic acid (PLA), is folded and aggregated to form multiple longitudinal channels, which are then wrapped in a wrapping material to form a cylindrical filter rod. When hot smoke passes through the PLA polymer, it reaches its glass transition temperature, absorbing heat and dissipating the heat energy of the smoke, reducing the temperature by 14-23°C. However, using PLA for cooling can significantly trap aerosols and cause them to melt and accumulate, blocking the transmission channels, thereby reducing cooling efficiency and affecting puff quality. This technology was developed and industrialized by tobacco giant Philip Morris International (PMI). A well-known application is the iQOS series of heated cigarettes. Currently, iQOS heatsticks can reduce smoke temperatures to 40°C.

[0004] At present, major tobacco companies at home and abroad have also launched corresponding heated cigarette products. Through extensive research, it can be found that the current research on the cooling performance of heated cigarette paper sticks mainly focuses on the following three aspects:

[0005] (1) Cooling the smoke of heated cigarettes is achieved by adding cooling materials such as heat-absorbing materials, heat-storing materials, and heat-conducting materials to cigarettes. British American Tobacco Group (BAT) uses perforated cardboard empty tube filter rods to reduce smoke temperature. Patent publication number CN110372916A discloses a heat-not-burn cigarette filter rod that uses a starch empty tube as a cooling section. The patent uses starch, phase change material and polyol to prepare a starch-based cooling material. The phase change material has the effect of absorbing and storing heat, which can significantly reduce the temperature of the smoke flow and achieve a rapid and strong cooling effect. The cooling effect can reach 70-120°C. The raw materials used in the preparation are all biodegradable materials. At the same time, it effectively reduces the interception of aroma components in cigarette smoke. However, this patent does not mention the solution to the problem that the empty paper rod has an obvious "paper baking" smell during the heating and smoking process, which affects the sensory quality of heated cigarettes; Patent publication number CN109700 The invention patent 070A discloses a cooling type of acetate fiber particles, which use hydroxypropyl methylcellulose as the outer coating layer to form a dense and leak-proof film on the surface of active particles or inactive particles, which can significantly reduce the temperature of cigarette smoke, but this patent does not mention a method for improving the smoking quality; the invention patent CN106235403A discloses a slow-release flavor filter rod, which mixes low, medium and high molecular weight PEG in a certain proportion and sprays it on the filter tow. PEG can also be mixed with propylene glycol and hexadecyl alcohol to form a granular, round ribbon or coating-like heat-absorbing gel and added to the filter rod, which can reduce the smoke temperature by 1 to 8°C. Although this patent can improve the smoking quality, it is not effective in reducing the smoke temperature.

[0006] (2) Improve heat loss from smoke through cooling structure design, such as using cavities to buffer heat storage, lengthening smoke channels, and enhancing heat exchange between smoke and the external environment. A multi-segment cavity structure can be used in the cigarette structure, combined with highly transparent or perforated wrapping paper to improve contact between ambient air and high-temperature smoke. A column containing multiple longitudinal straight channels can be considered a multi-cavity cooling structure. The invention patent with patent publication number WO2017102633A1 discloses a method of using a spiral curved channel coiled parallel to the cross section as a flue gas cooling channel. The channel surface is also provided with periodically raised protrusions, which are more conducive to flue gas collision heat exchange and increase the flue gas cooling amplitude. However, although the spiral curved channel is conducive to reducing the flue gas temperature, it will have an adverse effect on the suction quality; the invention patent with patent publication number CN207604513U discloses an aerosol generating article, which is combined with an aerosol generating device to form an aerosol, and uses woven PLA fiber bundles for cooling. However, the biggest problem with using polylactic acid (PLA) is that it will collapse, soften and melt after contact with high-temperature flue gas, resulting in blockage of the flue gas channel, affecting the cooling effect of the cooling material. Aerosol retention should be a problem that comes with it, affecting the suction quality.

[0007] (3) Composite cooling and heating cigarette filter rods are constructed by designing cooling structures and adding cooling materials. Sichuan China Tobacco Industrial Co., Ltd.'s early "Kuanzhai" cigarettes used 18mm embossed gathered aluminum foil composite paper for cooling; Hubei China Tobacco Industrial Co., Ltd.'s "MOK" cigarettes used perforated embossed gathered PLA material for cooling; Patent Publication No. CN207519612U discloses a flavoring and cooling base rod that uses 10mm embossed gathered PLA film to achieve the purpose of cooling. Using embossed gathered polylactic acid film is currently the most commonly used cooling method.

[0008] Research shows that most current heated cigarettes use a three-stage design, namely, a cigarette section, a cooling section, and a filter section. When the cigarette reaches the atomization temperature under heating conditions of 250-350°C, the atomizer and flavoring substances in the cigarette section material vaporize and condense to form an aerosol. Since the cooling section of the cigarette is short and the entire cigarette section is heated, the inlet smoke temperature is too high, resulting in a significant difference in the smoking experience compared to traditional cigarettes, which directly affects product quality and user experience. The hollow paper rod of heated cigarettes is the cooling element and smoke transmission channel of heated cigarettes, and has good aerosol conduction and cooling performance. However, the development of hollow paper rods for heated cigarettes has the following bottlenecks: (1) Most of the aerosol release is intercepted by the hollow section, affecting the sensory quality; (2) Due to the thin wall thickness of the hollow paper rod, the side wall temperature of the heated cigarette is high, which is prone to lip burning; (3) During the heated smoking process, the hollow paper rod has a noticeable "paper baking" smell, which affects the sensory quality of the heated cigarette. Summary of the Invention

[0009] This patent proposes to simultaneously improve cooling performance and high-temperature deformation resistance by constructing a ternary network structure for the heated cigarette hollow paper rod, combining rapid cooling and a high-mobility coating interface. This maintains and regulates the low retention, high toughness, and high hardness characteristics. This patent will provide a theoretical foundation and technical support for the development of heated cigarette hollow paper rods and offer new insights into the transformation and upgrading of the heated cigarette industry.

[0010] Problems existing in the existing technology: (1) Most of the aerosol released is intercepted by the hollow section, affecting the sensory quality;

[0011] (2) The thin wall of the hollow paper stick leads to a higher temperature on the side wall of the heated cigarette, which can easily cause lip burns;

[0012] (3) During the heating and smoking process, the empty paper stick has a distinct "paper baking" smell, which affects the sensory quality of the heated cigarette.

[0013] [Technical solution]

[0014] To address at least one of the aforementioned issues, the present invention provides a low-retention, heat-resistant hollow paper rod for heated cigarettes and a method for preparing the same. This method, for the first time, combines the numerous interconnected heat-conducting channels within diatomaceous earth with its ability to smooth, lightweight, and strong paper during papermaking, while also reducing shrinkage caused by humidity changes. The rod is loaded with multiple phase-change cooling materials to create a multi-gradient, rapid cooling ternary network structure, achieving rapid and efficient cooling. A novel design concept for a two-segment, multi-gradient cooling transmission channel is also proposed. The first segment is designed as a hollow paper rod channel that utilizes a combination of multiple phase-change materials for rapid cooling, while the second segment is designed as a stable, high-strength hollow paper rod transmission channel with excellent high-temperature deformation resistance. These two gradient cooling transmission channels, each serving a different function, are connected sequentially and at varying length ratios, achieving a simultaneous improvement in both the low retention rate and the heat resistance of the hollow paper rod.

[0015] The first object of the present invention is to solve the "easy lip burn" phenomenon caused by the high temperature of the side wall of heated cigarettes. A method for preparing a hollow paper stick with high strength, high toughness and high heat resistance is provided. The method comprises the following steps:

[0016] (1) First, plant fiber and regenerated cellulose fiber raw materials are obtained by beating and grinding, and regenerated cellulose fiber and a high-temperature resistant additive are added to a reaction container and stirred evenly to obtain a modified fiber raw material.

[0017] (2) The plant fiber of step (1) and the regenerated cellulose fiber raw material modified with a high-temperature resistant additive are mixed in a certain proportion to make a hollow paper stick base paper for use in the second stage.

[0018] (3) Adding a phase-change temperature-resistant material and charge-reversal-treated diatomaceous earth into a reaction container, stirring the mixture evenly at room temperature to obtain a mixed solution.

[0019] (4) The mixed solution of step (3) is used to prepare hollow paper stick base paper using the plant fiber and regenerated cellulose fiber in step (1) as raw materials through two processes: pulp addition and surface coating, as the first stage.

[0020] (5) The base paper of steps (4) and (2) is prepared into a hollow paper stick, which is connected and combined with an adhesive to obtain a low-retention, heat-resistant hollow paper stick for heating cigarettes.

[0021] In one embodiment of the present invention, the steps include:

[0022] (1) Plant fiber or regenerated cellulose fiber is added to a Wall-E pulper for decomposition, and then the concentration is adjusted for pulping to obtain the initial fiber raw material.

[0023] (2) The regenerated cellulose fiber in step (1) is mixed with a high temperature resistant additive, and stirred evenly at room temperature of 25° C. to obtain a modified regenerated cellulose fiber raw material.

[0024] (3) The plant fiber suspension obtained in steps (1) and (2) and the modified regenerated cellulose fiber suspension are mixed and then subjected to papermaking on a net, pressing and dehydrating, and drying in different proportions to obtain a hollow paper stick base paper with high strength, high toughness, and high heat resistance.

[0025] In one embodiment of the present invention, the plant fiber described in step (1) is one or more of bleached chemical hardwood pulp fiber, bleached chemical softwood pulp fiber, bleached chemical bamboo pulp fiber, hemp pulp fiber, and natural chemical mechanical pulp fiber, and the beating degree is 30-60°SR; the regenerated cellulose fiber is one or more of viscose fiber, Tencel fiber, modal fiber, bamboo fiber, chitin fiber, and cuprammonium fiber, and the beating degree is 18-50°SR.

[0026] In one embodiment of the present invention, the Wall-E beater deflaking concentration in step (1) is 1.57%.

[0027] In one embodiment of the present invention, the refining concentration of the PFI refiner in step (1) is 10%.

[0028] In one embodiment of the present invention, the refining speed of the PFI refiner in step (1) is 10,000 rpm-60,000 rpm.

[0029] In one embodiment of the present invention, the high temperature resistant auxiliary agent in step (2) is one or more polymer materials containing phosphorus, boron, silicon, and halogen element groups.

[0030] In one embodiment of the present invention, in step (2), the mass ratio of the modified regenerated cellulose fiber raw material to the high-temperature resistant auxiliary agent is 1:1-4; the mass percentage concentration of the high-temperature resistant auxiliary agent is 1%-5%; stirring at 50-80°C and 300-600rpm for 3-6h, keeping warm for 1-2h, and washing three times with water to obtain a fiber suspension.

[0031] In one embodiment of the present invention, the papermaking decomposition process in step (3) is decomposition at a speed of 3000r / min for 5-10min, a pressing pressure of 0.4Mpa, a pressing time of 3min, and a drying time of 10min at 105℃.

[0032] In one embodiment of the present invention, the ratio of plant fiber to modified regenerated cellulose fiber in step (3) is 6-8:4-2. Paper weight 60-100 g / m 2 .

[0033] The second object of the present invention is to solve the problem of a noticeable "baked paper" smell occurring in hollow paper sticks during smoking of heated cigarettes. The present invention provides a method for preparing a high-efficiency cooling composite phase change material and a fast and efficient cooling hollow paper stick, comprising the following steps:

[0034] (1) Add diatomaceous earth, water, and a cationic additive into a reaction container, stir evenly at room temperature (25° C.), react for a period of time, and wash three times to obtain charge-reversed diatomaceous earth.

[0035] (2) Add phase change temperature-resistant material and charge reversal treated diatomaceous earth into a reaction container, stir evenly at room temperature of 25°C, react for 1-3 hours, and wash three times to obtain a composite phase change material.

[0036] (3) The composite phase change material of step (2) is prepared by three processes: in-slurry addition, surface coating, and in-slurry addition combined with surface coating to prepare the first section of hollow paper stick base paper with plant fiber and regenerated cellulose fiber as raw materials.

[0037] In one embodiment of the present invention, the diatomaceous earth in step (1) has a negative charge on its surface and a particle size of 5-250 mm; the cationic adjuvant is one or more of polyethyleneimine, chitosan, cationic polyacrylamide, sodium carboxymethyl cellulose, and cationic starch.

[0038] In one embodiment of the present invention, the mass ratio of diatomaceous earth to water in step (1) is 1:50-100.

[0039] In one embodiment of the present invention, the mass ratio of diatomaceous earth to cationic auxiliary agent in step (1) is 1:4-10.

[0040] In one embodiment of the present invention, the uniform mixing in step (1) is specifically: stirring at 400 rpm for 1-2 hours.

[0041] In one embodiment of the present invention, the uniform mixing in step (2) is specifically: stirring at 600 rpm for 1-3 hours.

[0042] In one embodiment of the present invention, the phase change temperature-resistant material described in step (2) is one or more of polyethylene glycol with a molecular weight of 600, 1000, 2000, 6000, and 10000; the crystalline hydrated salt is one or more of magnesium chloride hexahydrate, magnesium nitrate hexahydrate, sodium thiosulfate pentahydrate, palladium hydroxide octahydrate, sodium sulfate decahydrate, calcium chloride hexahydrate, lithium perchlorate trihydrate, and disodium hydrogen phosphate dodecahydrate; the fatty acid is one or more of octadecanoic acid, hexadecanoic acid, tetradecanoic acid, and dodecanoic acid, and the fatty alcohol is one or more of dodecanol, tetradecanoic acid, hexadecanol, pentaerythritol, and neopentyl glycol.

[0043] In one embodiment of the present invention, in step (2), the mass ratio of the phase change temperature-resistant material to the charge reversal diatomaceous earth is 1:1-4, and the reaction time is 1-3 hours.

[0044] In one embodiment of the present invention, the mass ratio of the phase change temperature-resistant material to water in step (2) is 1-5:50-100.

[0045] In one embodiment of the present invention, the amount of the composite phase change material added to the pulp in step (3) is 5%-20%, relative to the absolute dry raw material, and the paper weight is 60-100g / m 2 .

[0046] In one embodiment of the present invention, the coating method in step (3) is roller pressing; the coating liquid is one or more of starch, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), and sodium carboxymethyl cellulose; and the mass ratio of the coating liquid to the composite phase change material is 10-20:1.

[0047] The third object of the present invention is to solve the problem that most of the aerosol release is intercepted by the hollow section. A method for constructing a multi-gradient hollow paper stick with two sections, namely a rapid cooling channel and a stable high-strength transmission channel, is provided, comprising the following steps:

[0048] (1) The first section of hollow paper stick base paper and the second section of hollow paper stick base paper are prepared into hollow paper sticks.

[0049] (2) The two hollow paper sticks are connected and combined by an adhesive to obtain a low-retention, heat-resistant hollow paper stick for heating cigarettes.

[0050] In one embodiment of the present invention, the hollow paper stick in step (1) is prepared by machine or manual curling.

[0051] In one embodiment of the present invention, the binder in step (2) is one or more of starch, sodium carboxymethyl cellulose, and guar gum.

[0052] In one embodiment of the present invention, in step (2), the ratio of the first section of hollow paper rods (rapid cooling section) to the second section of hollow paper rods (high-strength transmission section) is 3-7:7-3.

[0053] The fourth purpose of the present invention is to combine two hollow paper sticks and connect them with a filter section and a cigarette section for application in the field of heated cigarettes.

[0054] In one embodiment of the present invention, the charge-reversed diatomaceous earth in step (3) is cationic polymer-modified diatomaceous earth with a positively charged surface.

[0055] In one embodiment of the present invention, the step (4) of mixing and adding the composite phase change material into the slurry comprises the following steps:

[0056] (1) The plant fibers are deflated using a fiber deflation device to obtain a uniformly dispersed fiber suspension.

[0057] (2) The regenerated cellulose fibers are deflated using a fiber deflation device to obtain a uniformly dispersed fiber suspension.

[0058] (3) The fiber suspensions obtained in step (1) and step (2) are mixed and dispersed using a fiber dispersing device to obtain a uniformly dispersed fiber suspension. At the same time, the composite phase change material is added.

[0059] (4) The fiber suspension obtained in step (3) is placed on a screen for papermaking, squeezed for dehydration, and dried to obtain the first section of hollow paper stick base paper.

[0060] The addition amount of the composite phase change material is 5%-20% relative to the absolute dry raw material.

[0061] In one embodiment of the present invention, the hollow paper sticks described in step (5) are prepared by machine or manual curling; the binder is one or more of starch, sodium carboxymethyl cellulose, and guar gum. The ratio of the first hollow paper stick (rapid cooling section) to the second hollow paper stick (high-strength transmission section) is 3-7:7-3.

[0062] The rapid cooling section and the high-strength transmission section are connected to a low-retention / heat-resistant hollow paper rod, which is used as a cooling total section and is combined with the cigarette section and the filter section in sequence for heating cigarettes.

[0063] Beneficial effects

[0064] (1) The hollow paper stick for heating cigarettes of the present invention is heat-resistant modified for regenerated cellulose fibers, and the ratio of plant fibers to regenerated cellulose fibers is regulated to achieve simultaneous improvement in hardness, strength and heat resistance, thereby solving the "easy lip burn" phenomenon caused by the high temperature of the side wall of the heating cigarette.

[0065] (2) The hollow paper stick for heated cigarettes of the present invention utilizes the numerous interconnected heat-conducting channels within diatomaceous earth, reverses its surface charge to a positive charge through grafting, and then mixes it with a variety of phase-change cooling materials. Through hydrogen bonding, hydroxylamine reaction, and electrostatic adsorption, a multi-layer synergistic cooling composite material is constructed, which imparts high-temperature deformation resistance to the paper while rapidly cooling it. By constructing a composite phase-change polymer network, a "bridge" is built to enhance the interaction between the fiber raw material and the high-temperature aerosol. This solves the problem of the obvious "baked paper" smell of the hollow paper stick during the heated smoking process.

[0066] (3) The hollow paper stick for heating cigarettes of the present invention adopts segmented cooling. Without increasing the length of the cooling section, the cooling section is designed as two sections of multi-gradient cooling transmission channels, namely a rapid cooling section and a high-strength transmission section. The two hollow paper sticks are connected at different length ratios. The different cooling and temperature resistance characteristics of the composite phase change polymer material and the high-strength and high-resistance heat-resistant paper stick are utilized to compare their overall interception effects, thereby achieving an overall low interception rate and excellent high-temperature deformation resistance, which effectively solves the problem that most of the aerosol release is intercepted by the hollow section.

[0067] (4) The various raw materials used in the hollow paper rod for heating cigarettes of the present invention are coordinated and synergistically formed to form a product with excellent performance. Diatomaceous earth is commonly used in the papermaking process, which has the effect of making paper smoother and lighter. At the same time, the unique internal interconnected heat conduction channels of diatomaceous earth provide abundant retention points for various phase change cooling materials, thus achieving the effect of "killing two birds with one stone". On the other hand, the bulk materials and polymer materials are low-priced and easily available, and the use of the present invention has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 The rapid cooling section and high-strength transmission section have different length ratios (unit: mm). DETAILED DESCRIPTION

[0069] The following describes preferred embodiments of the present invention. It should be understood that the examples are intended to better illustrate the present invention and are not intended to limit the present invention. Where the solvent is not specifically specified in the examples, water is used as the solvent. All fractions are calculated by mass.

[0070] The test methods involved in the following embodiments are:

[0071] Performance testing method:

[0072] Tobacco segments from a cigarette sample were inserted into an HnB cigarette heater for heating. The resulting smoke was drawn into a T-shaped three-way pipe by a smoking machine. Puffs were drawn in HCI mode, with a puff duration of 2 seconds, a puff interval of 30 seconds, and a puff volume of 55 mL per puff, resulting in a bell-shaped puff curve. The other two ends of the three-way pipe were connected to the smoking machine and a smoke temperature measurement device. A temperature recorder recorded the dynamic temperature of the smoke exiting the filter tip, as measured by a thermocouple (see Patent Publication No. CN110411597A - Mouthpiece Temperature Measurement Device).

[0073] Phase change material loading test:

[0074] The mass of the diatomaceous earth loaded phase change material before and after drying to a certain dryness (dryness: 3.0%) was weighed, and the loading amount was characterized by the change in mass.

[0075] Sensory evaluation:

[0076] It is carried out in accordance with "YC / T415-2011 Sensory Evaluation Method for Tobacco Products".

[0077] The raw materials used in the following examples are:

[0078] The high-temperature resistant additive described in the present invention is one or more polymer materials containing phosphorus, boron, silicon, and halogen element groups: it can be prepared by itself or a commercially available product. The high-temperature resistant additive involved in the following embodiments is purchased from Guangzhou Dongfugui Chemical Raw Materials Co., Ltd., item number: organic high-temperature resistant additive SRE-5250.

[0079] The Tencel fiber and viscose fiber involved in the following embodiments were purchased from Hubei Aoyuan Meigu Company; the diatomaceous earth was purchased from Sinopharm Chemical Reagents, item number: XW688555499, with a median particle size of 3.5 μm; the polyethyleneimine was purchased from Shanghai Ala Deng Biochemical Technology Co., Ltd., item number: E107078, with a molecular weight of 1800; and the starch was purchased from Hangzhou Zhiyou Technology Co., Ltd.

[0080] The raw material preparation method adopted in the following examples is:

[0081] Preparation method of 18°SR broadleaf pulp and 18°SR coniferous pulp: beat the pulp with a 5kg weight on a Wall-E beater for about 15-20 minutes, from the initial 12.5°SR to 18°SR; and prepare the above-mentioned 18°SR broadleaf pulp and 18°SR coniferous pulp respectively.

[0082] Preparation method of 18°SR heat-resistant additive modified Tencel fiber, 18°SR Tencel fiber, 18°SR viscose fiber, and 18°SR heat-resistant additive modified viscose fiber: Because the above-mentioned pulps are used in small amounts and are not suitable for large-scale beating by a Wall-E beater, a PFI refiner is used for refining treatment. The initial beating degree is 9-12°SR, so the knife distance is 0.2mm, and the refining is about 5000-7500r, and 18°SR heat-resistant additive modified Tencel fiber, 18°SR Tencel fiber, 18°SR viscose fiber, and 18°SR heat-resistant additive modified viscose fiber are prepared respectively.

[0083] Example 1: Preparation of a low-retention, high-temperature-resistant hollow paper stick for heating cigarettes

[0084] The specific steps are as follows: (1) adding 12 g of a high-temperature resistant additive to 388 ml of water to prepare a high-temperature resistant modified additive with a mass percentage concentration of 3%, adding 12 g of 18°SR Tencel fiber thereto, stirring at 300 rpm at 50°C for 3 h, keeping warm for 1 h, and then washing three times with water to obtain a Tencel fiber suspension with a concentration of 10% of 18°SR heat-resistant additive;

[0085] 18°SR hardwood pulp and 18°SR softwood pulp are added into water respectively to obtain an 18°SR hardwood pulp suspension with a concentration of 10% and an 18°SR softwood pulp suspension with a concentration of 10%;

[0086] (2) The obtained 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR heat-resistant additive modified Tencel fiber suspension, all of which had a mass percentage concentration of 10%, were respectively ground using a PFI refiner at 15,000 r, 15,000 r and 20,000 r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp, and 48°SR for the heat-resistant additive modified Tencel fiber;

[0087] After refining, the pulp suspension is prepared according to the ratio of broadleaf pulp: softwood pulp: heat-resistant additive modified Tencel fiber = 4:4:2 (absolute dry mass ratio). The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, and paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0088] (3) Add 2 g of diatomaceous earth with a particle size of 20 mm to 98 ml of water, add 8 g of cationic auxiliary polyethyleneimine with a molecular weight of 1800, stir at 400 rpm for 1 hour at room temperature of 25°C, wash three times and then dry at 60°C for 6 hours to obtain charge reversal diatomaceous earth. According to the above method, in order to obtain more charge reversal diatomaceous earth, it can be prepared multiple times.

[0089] (4) Add 5 g of disodium hydrogen phosphate dodecahydrate to 95 ml of water, and at the same time add 5 g of the charge reversal diatomaceous earth obtained in step (3), stir at 600 rpm at room temperature of 25 ° C for 1 hour, wash three times and then dry. The drying conditions are: 60 ° C, 6 hours, to obtain a temperature-resistant composite phase change material.

[0090] (5) Processing of raw materials:

[0091] 18°SR Tencel fiber was added to water, stirred at 300 rpm at 50°C for 3 hours, kept warm for 1 hour, and then washed three times with water to obtain a 10% 18°SR Tencel fiber suspension; 18°SR hardwood pulp and 18°SR softwood pulp were respectively added to water to obtain a 10% 18°SR hardwood pulp suspension and a 10% 18°SR softwood pulp suspension;

[0092] The 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR Tencel fiber suspension prepared according to the above method, each with a mass percentage concentration of 10%, were respectively ground using a PFI refiner at 15,000 r, 15,000 r and 20,000 r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp and 48°SR for the Tencel fiber;

[0093] After refining, a pulp suspension is prepared according to the ratio of broadleaf pulp: coniferous pulp: Tencel fiber = 4:4:2 (absolute dry mass ratio), and after mixing, the composite phase change material prepared in step (4) is added in an amount of 10%. The papermaking decomposition process is 3000r / min speed for 5-10min, pressing pressure of 0.4Mpa, pressing time of 3min, drying temperature of 105℃, drying time of 10min, and paper weight of 60g / m 2 , and obtain the first section of hollow paper stick base paper.

[0094] (6) Using a paper stick forming machine, the first section of hollow paper stick base paper and the second section of hollow paper stick base paper are prepared into paper sticks.

[0095] First, a starch binder was prepared by adding 1 g of starch to 99 ml of water, stirring at 500 rpm at 80°C for 1 hour, and then keeping the mixture at 60°C to obtain a starch binder with a mass percentage concentration of 1%.

[0096] Secondly, a starch adhesive is applied to the interface of two hollow paper sticks connected at a length ratio of 5:5, and finally a low-retention and high-temperature resistant hollow paper stick that can be used for heating cigarettes is obtained.

[0097] In this example, the first section of the hollow paper rod maintains high strength and hardness while also achieving a cooling effect on the flue gas. The second section of the hollow paper rod achieves high moisture absorption rate and high cooling efficiency while maintaining high temperature deformation resistance.

[0098] Example 2: Effect of the amount of high temperature resistant modification additive

[0099] The specific implementation method is the same as Example 1, except that step (1) in Example 1 is adjusted to add 4g of high temperature resistant additive to 396ml of water to prepare a high temperature resistant modified additive with a mass percentage concentration of 1%. The specific adjustment step (1) is:

[0100] (1) 4 g of a high-temperature resistant additive was added to 396 ml of water to prepare a high-temperature resistant modified additive with a mass percentage concentration of 1%; 12 g of 18°SR Tencel fiber was added thereto, stirred at 300 rpm at 50°C for 3 h, kept warm for 1 h, and then washed three times with water to obtain a Tencel fiber suspension with a concentration of 10% 18°SR heat-resistant additive modified Tencel fiber.

[0101] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0102] Example 3: Effect of the amount of high temperature resistant modification additive

[0103] The specific implementation method is the same as Example 1, except that step (1) in Example 1 is adjusted to add 20g of high temperature resistant additive to 380ml of water to prepare a high temperature resistant modified additive with a mass percentage concentration of 5%. The specific adjustment step (1) is:

[0104] (1) Add 20 g of high-temperature resistant additive to 380 ml of water to prepare a high-temperature resistant modified additive with a mass percentage concentration of 5%; add 12 g of 18°SR Tencel fiber thereto, stir at 300 rpm at 50°C for 3 h, keep warm for 1 h, and then wash three times with water to obtain a 10% 18°SR heat-resistant additive modified Tencel fiber suspension.

[0105] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0106] Example 4: Effect of the ratio of plant fiber and high temperature resistant additive modified regenerated fiber

[0107] The specific embodiment is the same as Example 1, except that step (2) in Example 1 is adjusted to prepare a pulp suspension after grinding in a ratio of hardwood pulp: softwood pulp: heat-resistant additive-modified Tencel fiber = 4:5:1 (absolute dry weight ratio). At the same time, step (5) is also changed according to this ratio.

[0108] The specific adjustment steps (2) are:

[0109] 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR heat-resistant additive modified Tencel fiber suspension, all with a mass percentage concentration of 10%, were ground at 15,000 r, 15,000 r and 20,000 r, respectively, using a PFI refiner to refine the hardwood pulp to a beating degree of 43°SR, the softwood pulp to a beating degree of 45°SR, and the heat-resistant additive modified Tencel fiber to a beating degree of 48°SR;

[0110] After refining, the pulp suspension is prepared according to the ratio of broadleaf pulp: softwood pulp: heat-resistant additive modified Tencel fiber = 4:5:1 (absolute dry mass ratio). The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, and paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0111] Adjust step (5) to:

[0112] 18°SR Tencel fiber was added to water, stirred at 300 rpm at 50°C for 3 hours, kept warm for 1 hour, and then washed three times with water to obtain a 10% 18°SR Tencel fiber suspension; 18°SR hardwood pulp and 18°SR softwood pulp were respectively added to water to obtain a 10% 18°SR hardwood pulp suspension and a 10% 18°SR softwood pulp suspension;

[0113] 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR Tencel fiber suspension with a mass percentage concentration of 10% were respectively ground by a PFI refiner at 15000r, 15000r and 20000r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp and 48°SR for the Tencel fiber;

[0114] After refining, a pulp suspension is prepared according to the ratio of broadleaf pulp: coniferous pulp: Tencel fiber = 4:5:1 (absolute dry mass ratio), and the composite phase change material prepared in step (4) is added into the pulp in an amount of 10%. The papermaking deflaking process is 3000r / min speed for 5-10min, pressing pressure of 0.4Mpa, pressing time of 3min, drying temperature of 105℃, drying time of 10min, and paper weight of 60g / m 2 , and obtain the first section of hollow paper stick base paper.

[0115] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0116] Example 5: Effect of the ratio of plant fiber and high temperature resistant additive modified regenerated fiber

[0117] The specific embodiment is the same as Example 1, except that step (2) in Example 1 is changed to prepare the pulp suspension according to the ratio of hardwood pulp: softwood pulp: heat-resistant additive-modified Tencel fiber = 3:4:3 (absolute dry weight ratio). At the same time, step (5) is also changed according to this ratio.

[0118] Adjustment step (2) is:

[0119] 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR heat-resistant additive modified Tencel fiber suspension, all with a mass percentage concentration of 10%, were ground at 15,000 r, 15,000 r and 20,000 r, respectively, using a PFI refiner to refine the hardwood pulp to a beating degree of 43°SR, the softwood pulp to a beating degree of 45°SR, and the heat-resistant additive modified Tencel fiber to a beating degree of 48°SR;

[0120] After refining, the pulp suspension is prepared according to the ratio of broadleaf pulp: softwood pulp: heat-resistant additive modified Tencel fiber = 3:4:3 (absolute dry mass ratio). The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, and paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0121] Adjust step (5) to:

[0122] 18°SR Tencel fiber was added to water, stirred at 300 rpm at 50°C for 3 hours, kept warm for 1 hour, and then washed three times with water to obtain a 10% 18°SR Tencel fiber suspension; 18°SR hardwood pulp and 18°SR softwood pulp were respectively added to water to obtain a 10% 18°SR hardwood pulp suspension and a 10% 18°SR softwood pulp suspension;

[0123] 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR Tencel fiber suspension with a mass percentage concentration of 10% were respectively ground by a PFI refiner at 15000r, 15000r and 20000r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp and 48°SR for the Tencel fiber;

[0124] After refining, a pulp suspension is prepared according to the ratio of broadleaf pulp: coniferous pulp: tencel fiber = 3:4:3 (absolute dry mass ratio), and the composite phase change material prepared in step (4) is added into the pulp in an amount of 10%. The papermaking deflaking process is 3000r / min speed for 5-10min, pressing pressure of 0.4Mpa, pressing time of 3min, drying temperature of 105℃, drying time of 10min, and paper weight of 60g / m 2 , and obtain the first section of hollow paper stick base paper.

[0125] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0126] Example 6: Influence of the ratio of plant fiber and regenerated fiber modified with a high-temperature resistant additive. The specific implementation method is the same as that of Example 1, except that (2) in Example 1 is adjusted to prepare the pulp suspension after grinding according to the ratio of broadleaf pulp: coniferous pulp: heat-resistant additive modified Tencel fiber = 3:3:4 (absolute dry mass ratio), and step (5) is also changed according to this ratio.

[0127] Adjustment step (2) is:

[0128] 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR heat-resistant additive modified Tencel fiber suspension, all with a mass percentage concentration of 10%, were ground at 15,000 r, 15,000 r and 20,000 r, respectively, using a PFI refiner to refine the hardwood pulp to a beating degree of 43°SR, the softwood pulp to a beating degree of 45°SR, and the heat-resistant additive modified Tencel fiber to a beating degree of 48°SR;

[0129] After refining, the pulp suspension is prepared according to the ratio of broadleaf pulp: softwood pulp: heat-resistant additive modified Tencel fiber = 3:4:3 (absolute dry mass ratio). The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, and paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0130] Adjust step (5) to:

[0131] 18°SR Tencel fiber was added to water, stirred at 300 rpm at 50°C for 3 hours, kept warm for 1 hour, and then washed three times with water to obtain a 10% 18°SR Tencel fiber suspension; 18°SR hardwood pulp and 18°SR softwood pulp were respectively added to water to obtain a 10% 18°SR hardwood pulp suspension and a 10% 18°SR softwood pulp suspension;

[0132] 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR Tencel fiber suspension with a mass percentage concentration of 10% were respectively ground by a PFI refiner at 15000r, 15000r and 20000r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp and 48°SR for the Tencel fiber;

[0133] After refining, a pulp suspension is prepared according to the ratio of broadleaf pulp: coniferous pulp: tencel fiber = 3:4:3 (absolute dry mass ratio), and the composite phase change material prepared in step (4) is added into the pulp in an amount of 10%. The papermaking deflaking process is 3000r / min speed for 5-10min, pressing pressure of 0.4Mpa, pressing time of 3min, drying temperature of 105℃, drying time of 10min, and paper weight of 60g / m 2 , and obtain the first section of hollow paper stick base paper.

[0134] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0135] Example 7: Effect of the Addition Amount of Charge Reversal Diatomaceous Earth

[0136] The specific implementation method is the same as that of Example 1, except that the 5g charge-reversed diatomaceous earth in step (4) of Example 1 is adjusted to 10g. Specifically:

[0137] (4) Add 5 g of disodium hydrogen phosphate dodecahydrate to 95 ml of water, and at the same time add 10 g of the charge reversal diatomaceous earth obtained in step (3), stir at 600 rpm at 25 ° C for 1 hour, wash three times and then dry. The drying conditions are: 60 ° C, 6 hours, to obtain a temperature-resistant composite phase change material.

[0138] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0139] Example 8: Effect of the Addition Amount of Charge Reversal Diatomaceous Earth

[0140] The specific implementation method is the same as that of Example 1, except that the 5g charge-reversed diatomaceous earth in step (4) of Example 1 is adjusted to 15g. Specifically:

[0141] (4) Add 5 g of disodium hydrogen phosphate dodecahydrate to 95 ml of water, and add 15 g of charge reversal diatomaceous earth at the same time, stir at 600 rpm at 25 ° C for 1 hour, wash three times and then dry. The drying conditions are: 60 ° C, 6 hours, to obtain a temperature-resistant composite phase change material.

[0142] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0143] Example 9: Influence of Preparation Conditions of Heat-Resistant Composite Phase Change Materials

[0144] The specific implementation is the same as in Example 1, except that the stirring at 600 rpm at 25°C for 1 hour in (4) of Example 1 is changed to stirring at 600 rpm at 25°C for 2 hours. Specifically:

[0145] (4) Add 5 g of disodium hydrogen phosphate dodecahydrate to 95 ml of water, and add 5 g of charge reversal diatomaceous earth at the same time, stir at 600 rpm at 25 ° C for 2 h, wash three times and then dry. The drying conditions are: 60 ° C, 6 h, to obtain a temperature-resistant composite phase change material.

[0146] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0147] Example 10: Influence of Preparation Conditions of Heat-Resistant Composite Phase Change Materials

[0148] The specific implementation is the same as that of Example 1, except that the stirring at 600 rpm for 1 hour at room temperature of 25°C in step (4) of Example 1 is changed to stirring at 600 rpm for 3 hours at 25°C. Specifically:

[0149] (4) Add 5 g of disodium hydrogen phosphate dodecahydrate to 95 ml of water, and add 5 g of charge reversal diatomaceous earth at the same time, stir at 600 rpm at 25 ° C for 3 h, wash three times and then dry. The drying conditions are: 60 ° C, 6 h, to obtain a temperature-resistant composite phase change material.

[0150] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0151] Example 11: Effect of the Ratio of Two-Segment Paper Sticks

[0152] The specific implementation method is the same as that of Example 1, except that the starch adhesive is applied to the interface of the hollow paper sticks connected at a length ratio of 5:5 in (6) of Example 1 instead of being applied to the interface of the hollow paper sticks connected at a length ratio of 3:7. Specifically:

[0153] (6) Using a paper stick forming machine, the first section of hollow paper stick base paper and the second section of hollow paper stick base paper are prepared into paper sticks.

[0154] First, a starch binder was prepared by adding 1 g of starch to 99 ml of water, stirring at 500 rpm at 80°C for 1 hour, and then keeping the mixture at 60°C to obtain a starch binder with a mass percentage concentration of 1%.

[0155] Secondly, a starch adhesive is applied to the interfaces of the hollow paper sticks connected at a length ratio of 3:7, and finally a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes is obtained.

[0156] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0157] Example 12: Effect of the Ratio of Two-Segment Paper Sticks

[0158] The specific implementation method is the same as that of Example 1, except that the starch adhesive is applied to the interface of the hollow paper sticks connected at a ratio of 5:5 in (6) of Example 1 instead of being applied to the interface of the hollow paper sticks connected at a length ratio of 7:3. Specifically:

[0159] (6) Using a paper stick forming machine, the first section of hollow paper stick base paper and the second section of hollow paper stick base paper are prepared into paper sticks.

[0160] First, a starch binder was prepared by adding 1 g of starch to 99 ml of water, stirring at 500 rpm at 80°C for 1 hour, and then keeping the mixture at 60°C to obtain a starch binder with a mass percentage concentration of 1%.

[0161] Secondly, a starch adhesive is applied to the interfaces of the hollow paper sticks connected at a length ratio of 7:3, and finally a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes is obtained.

[0162] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0163] Comparative Example 1: Effect of not adding high temperature resistant additives

[0164] The specific implementation method is the same as Example 1, except that no high temperature resistant additive is added in Example 1, and unmodified Tencel fiber is used to prepare the second hollow paper stick base paper. The specific adjustment step (1) is:

[0165] (1) Add 12 g of 18°SR Tencel fiber to 400 ml of water, stir at 300 rpm at 50°C for 3 h, keep warm for 1 h, and then wash three times with water to obtain a 10% 18°SR Tencel fiber suspension;

[0166] 18°SR hardwood pulp and 18°SR softwood pulp are added into water respectively to obtain an 18°SR hardwood pulp suspension with a concentration of 10% and an 18°SR softwood pulp suspension with a concentration of 10%;

[0167] Adjustment step (2) is:

[0168] The 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR Tencel fiber suspension prepared according to the above method, each with a mass percentage concentration of 10%, were respectively ground using a PFI refiner at 15,000 r, 15,000 r and 20,000 r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp and 48°SR for the Tencel fiber;

[0169] After refining, the pulp suspension is prepared according to the ratio of broadleaf pulp: softwood pulp: Tencel fiber = 4:4:2 (absolute dry mass ratio). The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, and paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0170] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0171] Comparative Example 2: Effect of different fibers

[0172] The specific implementation is the same as that of Example 1, except that the Tencel fiber in Example 1 is changed into viscose fiber.

[0173] The specific adjustment steps (1) are:

[0174] (1) 12 g of a high-temperature resistant additive was added to 388 ml of water to prepare a high-temperature resistant modified additive with a mass percentage concentration of 3%. 12 g of 18°SR viscose fiber was added thereto, stirred at 300 rpm at 50°C for 3 h, kept warm for 1 h, and then washed three times with water to obtain an 18°SR viscose fiber suspension with a concentration of 10%.

[0175] 18°SR hardwood pulp and 18°SR softwood pulp are added into water respectively to obtain an 18°SR hardwood pulp suspension with a concentration of 10% and an 18°SR softwood pulp suspension with a concentration of 10%;

[0176] (2) 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension and 18°SR heat-resistant additive modified viscose fiber suspension, all with a mass percentage concentration of 10%, were ground at 15,000 r, 15,000 r and 20,000 r, respectively, using a PFI refiner to grind the hardwood pulp to a beating degree of 43°SR, the softwood pulp to a beating degree of 45°SR, and the heat-resistant additive modified viscose fiber to a beating degree of 50°SR;

[0177] After refining, the pulp suspension is prepared according to the ratio of broadleaf pulp: softwood pulp: heat-resistant additive modified viscose fiber = 4:4:2 (absolute dry mass ratio). The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0178] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0179] Comparative Example 3: Effect of Phase Change Heat-Resistant Materials

[0180] The specific implementation method is the same as Example 1, except that the 5g disodium hydrogen phosphate dodecahydrate in step (4) of Example 1 is adjusted to 2g disodium hydrogen phosphate dodecahydrate, 1g polyethylene glycol with a molecular weight of 600, 1g polyethylene glycol with a molecular weight of 6000, and 1g polyethylene glycol with a molecular weight of 10000.

[0181] Specifically:

[0182] (4) Add 2 g of disodium hydrogen phosphate dodecahydrate, 1 g of polyethylene glycol with a molecular weight of 600, 1 g of polyethylene glycol with a molecular weight of 6000, and 1 g of polyethylene glycol with a molecular weight of 10,000 to 95 ml of water, add 5 g of charge reversal diatomaceous earth, stir at 600 rpm for 1 h at room temperature of 25 ° C, wash three times and then dry. The drying conditions are: 60 ° C, 6 h, and temperature-resistant composite phase change materials are obtained.

[0183] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0184] Comparative Example 4: Effect of Simultaneous High-Temperature Modification of Hardwood Pulp, Softwood Pulp, and Tencel Fiber

[0185] The specific implementation is the same as that of Example 1, except that the adjustment steps (1) and (2) are as follows:

[0186] (1) adding 18°SR Tencel fiber to water, stirring at 300 rpm at 50°C for 3 hours, keeping warm for 1 hour, and then washing with water three times to obtain a 10% 18°SR Tencel fiber suspension; respectively adding 18°SR hardwood pulp and 18°SR softwood pulp to water to obtain a 10% 18°SR hardwood pulp suspension and a 10% 18°SR softwood pulp suspension;

[0187] (2) The 18°SR hardwood pulp suspension, 18°SR softwood pulp suspension, and 18°SR Tencel fiber suspension prepared according to the above method, each with a mass percentage concentration of 10%, were respectively ground using a PFI refiner at 15,000 r, 15,000 r, and 20,000 r, to a final beating degree of 43°SR for the hardwood pulp, 45°SR for the softwood pulp, and 48°SR for the Tencel fiber;

[0188] After refining, a pulp suspension was prepared according to the ratio of hardwood pulp: softwood pulp: Tencel fiber = 4:4:2 (absolute dry mass ratio), and 3% of a high-temperature resistant modification agent was added to the suspension. The 3% high-temperature resistant modification agent was prepared by adding 12g of the high-temperature resistant modification agent to 388ml of water.

[0189] The papermaking process is 3000r / min speed for 5-10min, pressing pressure 0.4Mpa, pressing time 3min, drying temperature: 105℃, drying time 10min, paper weight 100g / m 2 , and obtain the second section of hollow paper stick base paper.

[0190] The other steps were carried out according to the method of Example 1 to prepare a low-retention, high-temperature-resistant hollow paper stick that can be used for heating cigarettes.

[0191] Example 13: Preparation of heated cigarettes

[0192] The tobacco segment, the homemade combined cooling segment, and the filter segment were connected in sequence using starch bonding to obtain a homemade heated cigarette; the homemade combined cooling segment was prepared by wrapping the low-retention, high-temperature-resistant hollow paper stick for heating cigarettes prepared in the examples and comparative examples around a spiral model with a thread spacing of 1.5 mm.

[0193] Test results:

[0194] (1) Test results of Examples 1 to 3, Comparative Examples 1 to 2, and 4:

[0195] The flue gas temperature was tested respectively, and the specific data are shown in Table 1:

[0196] Table 1: Effect of reducing flue gas temperature

[0197] sample Flue gas temperature / ℃ iQOS e-cigarette sample (commercially available) 65 Example 1 53 Example 2 48 Example 3 42 Comparative Example 1 63 Comparative Example 2 56

[0198] As shown in Table 1, increasing the amount of high-temperature-resistant additive improves the flue gas temperature reduction effect. Tencel, as a regenerated cellulose fiber with excellent strength and hygroscopicity, has certain advantages over other regenerated cellulose fibers. It is worth noting that the hydrogen bonding effect of the modified paper in Comparative Example 4 was very poor, resulting in poor uniformity of the paper after papermaking. Therefore, subsequent flue gas temperature testing was not performed. This also demonstrates that the pulp cannot be modified as a whole, as this will damage the molding uniformity and paper strength.

[0199] (2) Test results of Examples 4 to 6:

[0200] Test flue gas temperature, see Table 2 for specific data:

[0201] Table 2: Effect of reducing flue gas temperature

[0202] sample Flue gas temperature / ℃ iQOS e-cigarette sample (commercially available) 65 Example 4 55 Example 5 50 Example 6 47

[0203] It can be seen from Table 2 that with the increase of the modified Tencel fiber content, the flue gas temperature reduction effect is more obvious.

[0204] (3) The loading amount of the phase change material on the charge reversal diatomaceous earth and the flue gas temperature were tested. The specific data are shown in Table 3:

[0205] Table 3: Phase change material loading and flue gas temperature reduction effect

[0206]

[0207]

[0208] As shown in Table 3, increasing the amount of diatomaceous earth increases the loading of the phase change material, which helps reduce the flue gas temperature. However, stirring time has little effect on the loading of the phase change material. Therefore, under the premise of keeping the total mass of the phase change material constant, increasing the type of phase change material will slightly increase the loading of the phase change material, while significantly reducing the flue gas temperature.

[0209] (4) Test flue gas temperature. See Table 4 for specific data:

[0210] Table 4: Effect of reducing flue gas temperature

[0211] sample Flue gas temperature / ℃ iQOS e-cigarette sample (commercially available) 65 Example 11 55 Example 12 46

[0212] It can be seen from Table 4 that the higher the proportion of the rapid cooling section of the hollow paper rod, the better the cooling effect.

[0213] (5) The above examples and comparative examples were subjected to sensory evaluation. The evaluation criteria were based on the "YC / T415-2011 Sensory Evaluation Method for Tobacco Products":

[0214] Table 5: Sensory evaluation of cigarette smoking quality

[0215]

[0216]

[0217] As can be seen from Table 5, Example 12 and Comparative Example 3 have better effects, proving that increasing the proportion of the rapid cooling section and mixing multiple types of phase change materials are not only beneficial to the cooling effect, but also improve the sensory quality of smoking cigarettes.

[0218] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A method for preparing a low-entrapment, heat-resistant hollow paper rod for heating cigarettes, characterized in that: The method comprises the following steps: (1) Tencel fiber with a beating degree of 18-50°SR and a high-temperature resistant additive are mixed to obtain a modified Tencel fiber; the mass ratio of the Tencel fiber to the high-temperature resistant additive is 1:1-4; the mass percentage concentration of the high-temperature resistant additive is 1%-5%; after mixing, stirring at 50-80°C and 300-600 rpm for 3-6 hours, keeping warm for 1-2 hours, and washing with water three times to obtain a modified Tencel fiber suspension; (2) mixing hardwood pulp with a beating degree of 30-60°SR, softwood pulp with a beating degree of 30-60°SR, and the modified Tencel fiber obtained in step (1) in a mass ratio of 3-4:3-5:4-1, and then making hollow paper stick base paper on a net to obtain the second section of hollow paper stick base paper; (3) adding water and a cationic additive to diatomaceous earth and stirring to obtain charge-reversed diatomaceous earth; A composite phase change material is obtained by mixing a phase change heat-resistant material, water, and charge-reversed diatomaceous earth; the charge-reversed diatomaceous earth has a positive charge on its surface and a particle size of 5-250 mm; the cationic auxiliary agent is one or more of polyethyleneimine, chitosan, cationic polyacrylamide, sodium carboxymethyl cellulose, and cationic starch; the mass ratio of the diatomaceous earth to water is 1:50-100; the mass ratio of the diatomaceous earth to the cationic auxiliary agent is 1:4-10; and the mixing is performed uniformly by stirring at 600 rpm for 1-3 hours; (4) After mixing hardwood pulp with a beating degree of 30-60°SR, softwood pulp with a beating degree of 30-60°SR, and Tencel fiber with a beating degree of 18-50°SR in a mass ratio of 3-4:3-5:4-1, the composite phase change material obtained in step (3) is added to the mixture, and hollow paper stick base paper is made on the net to obtain the first section of hollow paper stick base paper; the amount of the composite phase change material added is 5%-20%; (5) The first section of hollow paper stick base paper and the second section of hollow paper stick base paper are connected and combined with an adhesive to obtain a low-retention heat-resistant hollow paper stick for heating cigarettes.

2. The method according to claim 1, characterized in that The high temperature resistant additive is one or more polymer materials containing phosphorus, boron, silicon, and halogen element groups.

3. The method according to claim 2, characterized in that In step (2) and step (4), the papermaking decomposition process is 3000 r / min speed for 5-10 min, pressing pressure of 0.4 MPa, pressing time of 3 min, and drying time of 10 min at 105 ° C.

4. The method according to claim 3, characterized in that In step (3), the phase-change heat-resistant material is one or more polyethylene glycols having a molecular weight of 600, 1000, 2000, 6000, and 10000; the crystalline hydrated salt is one or more of magnesium chloride hexahydrate, magnesium nitrate hexahydrate, sodium thiosulfate pentahydrate, palladium hydroxide octahydrate, sodium sulfate decahydrate, calcium chloride hexahydrate, lithium perchlorate trihydrate, and disodium hydrogen phosphate dodecahydrate; the fatty acid is one or more of octadecanoic acid, hexadecanoic acid, tetradecanoic acid, and dodecanoic acid; the fatty alcohol is one or more of dodecanol, tetradecanoic acid, hexadecanol, pentaerythritol, and neopentyl glycol; the mass ratio of the phase-change heat-resistant material to the charge reversal diatomaceous earth is 1:1-4, and the reaction time is 1-3 h; the mass ratio of the phase-change heat-resistant material to water is 1-5:50-100.

5. The method according to claim 4, characterized in that In step (5), the first section of the hollow paper stick and the second section of the hollow paper stick are bonded in a length ratio of 3-7:7-3.

6. A low-retention, heat-resistant hollow paper stick for heating cigarettes prepared by the method according to any one of claims 1 to 5.

7. Use of the method according to any one of claims 1 to 5 or the low-retention, heat-resistant hollow paper rod for heated cigarettes according to claim 6 in the preparation of heated cigarettes.

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