CN110720664B

CN110720664B - Aerosol generating structure, preparation method and application

Info

Publication number: CN110720664B
Application number: CN201910977420.8A
Authority: CN
Inventors: 陈昀; 杨占平; 苏凯; 张丽; 窦峰; 曹智祥; 沈晶晶; 丁佳柱
Original assignee: Kunming Cellulose Fibers Co ltd; Zhuhai Cellulose Fibers Co ltd; Nantong Cellulose Fibers Co Ltd
Current assignee: Kunming Cellulose Fibers Co ltd; Zhuhai Cellulose Fibers Co ltd; Nantong Cellulose Fibers Co Ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2021-11-05
Anticipated expiration: 2039-10-15
Also published as: CN110720664A

Abstract

An aerosol generating structure comprising an aerosol atomizing unit and a flue gas cooling unit; the cooling structure in the smoke cooling unit comprises a filter stick with a phase change function, and the filter stick comprises a gap through which cigarette smoke can pass. The filter stick with the phase change function is made of non-woven materials. The filter stick comprises a non-woven material and a wrapping material; the non-woven material is folded to form a cylinder shape, and the wrapping material wraps the outside to form the filter stick with a cylinder structure. The non-woven material can reduce the temperature of cigarette smoke and has low adsorption rate to effective components in the cigarette smoke. The invention can be used for heating non-combustible cigarettes. The invention has the functions of reducing the temperature of the cigarette smoke and having lower adsorption rate to the effective components in the cigarette smoke. By adjusting the content and the thickness of the non-woven material, the suction resistance of the filter stick can be conveniently controlled, the temperature of the cigarette smoke can be quickly and greatly reduced under the condition of reducing the adsorption and filtration of the cigarette smoke, and the smoke is not polluted.

Description

Aerosol generating structure, preparation method and application

Technical Field

The invention belongs to the technical field of tobacco, and relates to smoke treatment, in particular to a structure for reducing the smoke temperature of a cigarette.

Background

With the increasing severity of the global smoking control environment and the growing concern of consumers on health, the research and development of a novel tobacco product capable of comprehensively and greatly reducing the release amount of harmful components in tobacco gradually becomes the key development point of the tobacco industry of all countries in the world. The cigarette without burning is a novel tobacco product which heats the cut tobacco by a special heat source (below 500 ℃ or even lower) and only heats the cut tobacco without burning. Researches show that the release amount of harmful components in tobacco smoke is closely related to heating and burning temperature, and the release amount of the harmful components in the smoke can be obviously reduced by reducing the heating or burning temperature. The heating non-combustion type tobacco products are developed and researched by large international tobacco companies such as Philippi Morris production company (called Feimo for short) and R.J. Reynolds tobacco company (called Reynolds for short), and especially patent applications are made on heating non-combustion type cigarette cigarettes. Chinese patents applied by Felmo tobacco company include CN96194107.3, CN201190000997.0, CN201280018570.2, CN201280026033.2, CN201280054623.6, CN201280048973.1, CN201280054563.8, CN201180016009.6, CN101778578A, CN 103889254A and the like; chinese patents CN201180031721.3 and CN200780045783.3, etc. applied by Reynolds tobacco corporation all disclose the cigarette technology of heating non-combustion type cigarette. In China, tobacco companies such as Yunan Zhongyan and Zhejiang Zhongyan also make related patent applications for heating non-combustion cigarettes, such as CN201710643438, CN201520442651, CN201710393624 and CN 201710391934.6. However, the first two commercial electrically heated non-combustible cigarette products (Accord, HeatBar) and other products in the market, which are introduced by Felmo tobacco corporation, still have many problems, wherein the central problem is that the electrically heated non-combustible cigarette has poor smoking feeling, which is embodied by the problems of high smoke temperature, poor smoke smoking uniformity and the like, which limits the market popularization to some extent. At present, the research on heating non-combustion type cigarettes at home and abroad mainly focuses on cigarette devices, cigarette design, cigarette paper, heating modes, heater types and the like, and no relevant literature and patent reports are found for using mixed non-woven materials as materials of temperature reduction sections in cigarettes.

Disclosure of Invention

In view of the foregoing technical needs and the drawbacks of the prior art, an object of the present invention is to provide a technique for reducing the smoke temperature of a tobacco product, and to provide a structure for rapidly reducing the smoke temperature of a cigarette, with low smoke resistance and low filtration, in particular, a filter rod structure, a method for preparing the same, and an application thereof.

In order to achieve the purpose, the invention adopts the technical scheme that:

an aerosol generating structure comprising an aerosol atomizing unit and a flue gas cooling unit; the cooling structure in the smoke cooling unit comprises a filter stick with a phase change function, and the filter stick comprises a gap through which cigarette smoke can pass.

Further, the filter stick with the phase change function is made of non-woven materials.

Optionally, the gap through which the cigarette smoke passes is a three-dimensional, through, non-linear gap.

Optionally, the filter rod comprises a nonwoven material and a wrapping material; the non-woven material is folded to form a cylinder shape, and the wrapping material wraps the outside to form the filter stick with a cylinder structure.

Optionally, the non-woven material is a non-woven material which can reduce the temperature of cigarette smoke and has low adsorption rate to effective components in the cigarette smoke.

Optionally, the nonwoven sheet has fluff, the fluff and fluff contacting each other to form a three-dimensional structure; the nonwoven material has pores inside the fibers and between the fibers.

Optionally, the nonwoven material has a thickness of 0.8mm or less.

Optionally, the nonwoven material is a blend of single fibers or multiple components; at least one of them is a fiber having a phase change function; the fibers comprise cellulose diacetate fibers, and the fibers with the phase change function comprise PLA fibers, PE fibers, polyester fibers, polyamide fibers and base fibers containing phase change materials. Wherein, the PLA fiber, the PE fiber, the polyester fiber and the polyamide fiber have phase change function in a certain temperature range.

Optionally, the circumference of the filter stick is 18mm to 28 mm.

Optionally, the porosity of the filter stick is 20% to 90%.

Optionally, the fiber cross-sectional shape comprises a Y-shape, a circular shape, an X-shape, or a random shape.

Optionally, the fibers have a linear density of 1 denier to 40 denier.

Optionally, the fibers have a length of 15mm to 80 mm.

The base fiber containing the phase-change material has the functions of absorbing, storing and releasing heat in a latent heat mode, and can be converted into a solid state and a liquid state in temperature change, so that the effects of absorbing and releasing heat are achieved. The phase change is represented by three-state change of gas, solid and liquid, physical processes such as crystallization, crystal form transformation to hydrocarbon and crystal melting, and the like, and is accompanied by the change of molecular aggregation state structure, and the temperature is not changed in the process but accompanied by the release or absorption of heat, so the phase change has the function of regulating the temperature. The "base fiber containing a phase change material" is a part of the "fiber having a phase change function", and the fiber having a phase change function also includes PLA fiber, PE fiber, polyester fiber, polyamide fiber, and the like which can be produced by a melt spinning method.

The basic fiber containing the phase-change material is prepared by organically combining the phase-change material with common fiber through a composite spinning method, a hollow fiber filling method and a microcapsule coating method spinning technology. The specific preparation method is the same as that described in the following documents: majunzhi, lechtang, "development and application of viscose-based energy-storage and temperature-adjustment fibers" [ J ], knitting raw material, 2012 (12): 22-23).

The 'fiber having a phase change function' includes a base fiber containing a phase change material and a corresponding fiber prepared by a melt spinning method.

Optionally, the phase change material is included in an amount of 15% to 70% by mass of the base fiber containing the phase change material.

Alternatively, the phase change material refers to a substance which changes the state of the substance under the condition of constant temperature and can provide latent heat, and includes inorganic phase change materials and organic phase change materials.

Optionally, the inorganic phase change material comprises MgCl₂·6H₂O、CaCl₂·6H₂O、Na₂SO₄·10H₂O、 Na₂HPO₄·12H₂O, and the like.

Optionally, the organic phase change material includes organic acid esters, polyols, higher alkanes, organic esters, and the like.

Optionally, the organic phase change material includes paraffin, polyethylene glycol, stearic acid-stearyl ester, trimethylolethane, neopentyl glycol, and the like.

Alternatively, the common fibers include cotton, polyester cotton, wool, polypropylene, acrylic, cellulose fibers, polyester fibers, polyurethane fibers, polylactic acid fibers, and the like.

Optionally, the wrapping material is filter tip wrapping paper with a gram weight of 20 g-40 g and a thickness of 0.08 mm-0.12 mm.

Optionally, the aerosol-generating structure further comprises a hollow tube portion located between and connected to the aerosol atomization unit and the flue gas cooling unit.

Optionally, the aerosol-generating structure further comprises a filter portion engaged with the smoke cooling unit; the filter tip part is positioned at the downstream of the smoke cooling unit; the "downstream" is the spatial orientation defined in terms of the direction of smoke flow and refers to the relative position closer to the smoker's mouth when smoking.

Optionally, the filter stick is an acetate fiber filter stick; the hollow pipe part is an acetate fiber hollow filter tip.

The aerosol-generating structure described above finds application in cigarettes and cigarettes that do not burn when heated.

In the above method of manufacturing an aerosol-generating structure, the flue gas cooling unit is cut to a fixed length and then combined with other components.

Further, the preparation method of the filter stick with the phase change function in the smoke cooling unit comprises the following steps: extracting the composite non-woven material, leveling the composite non-woven material by air flow, clamping and conveying the composite non-woven material by a pair of rollers, drafting the composite non-woven material by a pair of rollers through threads, applying a plasticizer and a cooling agent, retracting and finishing the composite non-woven material, conveying the composite non-woven material by a high-pressure nozzle, wrapping the composite acetate fiber non-woven material by forming paper, and slitting the composite non-woven material filter stick to a fixed length by a cutter.

Compared with a reference aerosol generating product containing an acetate fiber tow filter stick, the aerosol generating product containing the smoke cooling functional unit has a good cooling effect.

The invention provides an aerosol generating product containing a smoke cooling function unit, which comprises a plurality of units and is formed by assembling a bar in a bar composite forming mode. The unit comprises an aerosol atomization unit and a smoke temperature reduction unit located downstream of the aerosol atomization unit within the composite shaped article. The "downstream" is the spatial orientation defined in terms of the direction of smoke flow and refers to the relative position closer to the smoker's mouth when smoking.

In some applications, the smoke cooling unit is formed by aggregating non-woven materials formed by mixing single fibers or multi-component fibers, wherein at least one fiber has a phase change function. When the smoke sol passes through the cooling unit, the functional fiber with phase change generates phase change heat absorption, and the internal material of the cooling unit has a three-dimensional arrangement structure, so that the transverse conduction of heat energy is facilitated, and a better cooling effect is achieved. Meanwhile, the gathered non-woven material keeps the original shape, and the smoke is ensured to have a smooth channel. Because the suction resistance of the filter stick can be conveniently controlled by adjusting the thickness of the non-woven material, the linear density and the length of the fibers, the temperature of the cigarette smoke can be greatly reduced on the premise of reducing the adsorption and filtration of the cigarette smoke, no miscellaneous gas is brought to the smoke, and the experience of cigarette consumers is enhanced.

Drawings

Figure 1 is a schematic view of a two-stage aerosol-generating article configuration having a smoke temperature reducing unit according to an embodiment of the present invention.

Figure 2 is a schematic view of a three-stage aerosol-generating article configuration having a smoke temperature reduction unit according to an embodiment of the present invention.

Figure 3 is a schematic view of a four-stage aerosol-generating article configuration having a smoke temperature reduction unit according to an embodiment of the present invention.

Figure 4 is a schematic representation of a prior art four-stage aerosol-generating article structure (containing a reference sample of cellulose acetate tow).

Detailed Description

The present invention relates to an aerosol-generating article and associated method for rapidly reducing the temperature of cigarette smoke.

An aerosol-generating article is assembled from a plurality of units in the form of a rod composite. The plurality of units include an aerosol atomization unit and a unit for reducing the temperature of the flue gas located downstream of the aerosol atomization unit. The aerosol passing through the smoke cooling unit is cooled. The main body of the cooling unit is a structure formed by gathering non-woven materials, the void volume of the filter stick is the free space left after the space occupied by the non-woven materials, and the free space is free space except fibers and comprises closed voids and a through type channel. Compared with the traditional acetate fiber filter stick, the temperature of the smoke aerosol passing through the non-woven material filter stick is at least reduced by more than 2 ℃ compared with the temperature of the acetate fiber filter stick under the same measurement condition and the same suction resistance condition.

The aerosol has a relatively high temperature (greater than 100 ℃). By suction, through the nonwoven filter rod or the inlet of the cooling unit. The non-woven material filter stick comprises at least one through non-linear channel, and the cooling effect is achieved after smoke passes through the non-woven material filter stick. The nonlinear channels can be mutually staggered or mutually communicated to form a three-dimensional reticular channel, so that the aerosol can smoothly pass through, and high suction resistance or closed pressure drop is not generated at the same time. The through channel is generated in various modes, namely the mode provided by the invention can provide higher porosity and stronger mechanical strength and hardness through physical entanglement among fibers, and meets the requirements of subsequent processing and application.

Cooling is generally achieved by convection, conduction and radiation. Because the smoke temperature of the heating non-combustion cigarette is low, the heat exchange mainly transfers the heat of the smoke to the cooling section through convection, and the cooling section transfers the heat to the outer surface of the heat dissipation section in a conduction mode, thereby achieving the purpose of heat dissipation. In the traditional acetate fiber filter stick, the arrangement of tows in the filter stick is longitudinal arrangement, and air between the filaments has low heat conduction coefficient, so that heat energy is difficult to diffuse transversely. Resulting in a higher flue gas temperature after entry. The non-woven material has three-dimensional arrangement, and the fibers have a phase change function, so that heat energy can be absorbed conveniently, and the non-woven material has a better cooling effect.

The functional fiber with the phase-change material can effectively reduce the temperature of the smoke. The phase-change material refers to a small molecule or a high molecular material which has a phase-change function in a certain temperature range, wherein the phase-change function comprises the melting of a crystalline material. Melting of the crystals is generally accompanied by an endothermic phenomenon. The small molecule phase change material comprises paraffin and the like. The high-molecular phase-change material comprises polyethylene, PLA, PEG and HPMC/PEG blend. When the cigarette is heated and used without burning, the tobacco is heated at a temperature of 200 to 400 ℃, nicotine is released, and fewer harmful substances are generated compared with the traditional cigarette. The cooling section should therefore reduce nicotine filtration little or no.

The term "closed pressure drop" as used herein refers to the difference in static pressure between the two ends of the sample when the sample is passed through by an air stream under steady conditions at a volumetric flow rate of 17.5mL/s at the outlet end and when the sample is completely enclosed in the measuring device so that air cannot pass through the package. The occluded pressure drop has been measured herein according to CORESTA ("tobacco science research collaboration center") recommendation method 41, issued at 6 months 2007. A higher occluded pressure drop indicates that the smoker must use a greater force to smoke the smoking device.

The invention will be further described with reference to examples of embodiments shown in the drawings.

The following percentages (%) are by mass unless otherwise indicated.

Example 1

Referring to figure 1, a two-stage aerosol-generating article 10 having a smoke temperature reducing unit according to the invention comprises two units: aerosol atomizing unit 20, flue gas cooling unit 30. The two units are sequentially assembled coaxially into a rod 11 using cigarette paper 50 for a rod composite forming machine. The aerosol atomization unit 20 is positioned at the far end 13 of the rod; the flue gas cooling unit 30 is located downstream of the aerosol atomization unit, and the rod 11 has a mouth end 12.

When compositely assembled by the forming machine, the bar 11 has a length of approximately 45 mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm.

The aerosol atomizing unit 20 comprises a filamentary or pleated tobacco material, rolled by a cigarette making machine, wrapped in filter paper (not shown) to form a rod. The tobacco material comprises additives, wherein the additives comprise aerosol-forming additives such as glycerin and propylene glycol.

The flue gas cooling unit 30 is downstream of the aerosol atomization unit and is a rod of non-woven material containing phase change fibers wrapped by a plug wrap 31. The porous rod has a length of approximately 33mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The gram weight of the composite acetate fiber non-woven material of the embodiment is about 280g/m²The thickness is 0.543 mm. Wherein, the fineness of the acetate fiber is 8 deniers, and the fineness of the viscose fiber containing the cooling agent is 6 deniers. The mass ratio of the viscose fibers (composed of 30 wt% of paraffin phase change capsules and viscose basic fibers, purchased from Shanghai Rio fiber enterprises development Co., Ltd.) is 35%, and the mass ratio of the acetate fibers is 65%. The cross section of the acetate fiber is Y-shaped, and the average length of the acetate fiber is 38 mm; the viscose fibers are circular in cross section and 38mm in average length.

Opening and mixing the acetate fibers and the viscose fibers according to the set proportion, then pre-carding on a cotton type carding machine, and setting the basic parameters of carding: the speed of the cotton feeding roller is 0.42 r/min; the speed of the licker-in is 575.2 r/min; the speed of the cylinder is 557.00 r/min; the speed of the doffer is 7.61 r/min; the net outlet speed is 4.12 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2.05HZ, 13.10HZ and 20.22HZ. cylinder into a needle machine for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the first hydraulic pressure is controlled to be 5MPa, the second hydraulic pressure is 6.5MPa, and the production speed is 8m/min during spunlace; drying the spunlaced mixed nonwoven material, and then performing hot rolling finishing at 160 ℃ to obtain the composite acetate fiber nonwoven material for the non-combustible cigarette.

And then the non-woven material is processed on a paper filter stick forming machine according to the proportion of 1: opening at an opening ratio of 4, followed by adjustment of the retraction ratio to 0.7. And then wrapping the filter stick with wrapping paper with the gram weight of 20g and the thickness of 0.08mm, and cutting into small sections with the length of 120 mm.

The filter rod of nonwoven material had a percent void fraction of 79% and a closed draw resistance of 96mmH2O (120mm length).

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 1.

Table 1 mainstream aerosol temperature test results

Example 2

Referring to figure 1, a two-stage aerosol-generating article 10 having a smoke temperature reducing unit according to the invention comprises two units: aerosol atomizing unit 20, flue gas cooling unit 30. The two units are sequentially assembled coaxially into a rod 11 using cigarette paper 50 for a rod composite forming machine. The aerosol atomization unit 20 is positioned at the far end 13 of the rod; the flue gas cooling unit 30 is located downstream of the aerosol atomization unit, and the rod 11 has a mouth end 12. When compositely assembled by the forming machine, the bar 11 has a length of approximately 45 mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm.

The flue gas cooling unit 30 is downstream of the aerosol atomization unit and is a rod of non-woven material containing phase change fibers wrapped by a plug wrap 31. The porous rod has a length of approximately 33mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The gram weight of the composite acetate fiber non-woven material of the embodiment is about 274g/m²The thickness is 0.512 mm. Wherein, the fineness of the acetate fiber is 8 deniers, and the fineness of the viscose fiber containing the cooling agent is 6 deniers. The mass ratio of the viscose fibers (composed of 30 wt% of paraffin phase change capsules and viscose basic fibers, purchased from Shanghai Rio fiber enterprises development Co., Ltd.) is 15%, and the mass ratio of the acetate fibers is 85%. The cross section of the acetate fiber is Y-shaped, and the average length of the acetate fiber is 38 mm; the viscose fibers are circular in cross section and 38mm in average length.

Opening and mixing the acetate fibers and the viscose fibers according to the set proportion, then pre-carding on a cotton type carding machine, and setting the basic parameters of carding: the speed of the cotton feeding roller is 0.41 r/min; the speed of the licker-in is 574.8 r/min; the speed of the cylinder is 559.00 r/min; the speed of the doffer is 7.6 r/min; the net outlet speed is 4.15 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2.05HZ, 13.10HZ and 20.20HZ. cylinder into a needle machine for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the water pressure of a first spunlace is controlled to be 5MPa, the water pressure of a second spunlace is controlled to be 6.5MPa, and the production speed is 8 m/min; drying the spunlaced mixed nonwoven material, and then performing hot rolling finishing at 160 ℃ to obtain the composite acetate fiber nonwoven material for the non-combustible cigarette.

Then the non-woven material is opened on a paper filter stick forming machine according to the opening ratio of 1:4, and then the retraction ratio is adjusted to be 0.7. And then wrapping the filter stick with wrapping paper with the gram weight of 20g and the thickness of 0.08mm, and cutting into small sections with the length of 120 mm.

The filter rod of nonwoven material had a percent void fraction of 82% and a closed draw resistance of 94mm H2O (120mm length).

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 2.

Table 2 mainstream aerosol temperature test results

Example 3

As shown in fig. 2, a three-stage aerosol-generating article 10 having a smoke temperature reducing unit of the present invention comprises three units: an aerosol atomizing unit 20, a smoke cooling unit 30 and a filter 40. The aerosol atomization unit 20 is positioned at the far end 13 of the rod; the flue gas cooling unit 30 is positioned at the downstream of the aerosol atomization unit; the filter 40 is downstream of the smoke cooling unit and the rod 11 has a mouth end 12. The three units are sequentially assembled coaxially to form rod 11 by tightly wrapping cigarette paper 50. When compositely assembled, the rods 11 have a length of approximately 45 mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm.

Immediately downstream of the aerosol atomizing unit 20, the flue gas cooling unit 30 is a rod of non-woven material containing phase change fibers surrounded by a plug wrap 31. The porous rod has a length of approximately 25mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The gram weight of the composite polylactic acid fiber non-woven material of the embodiment is about 245g/m²The thickness is 0.455 mm. The mass ratio of the polylactic acid fiber is 50%, and the mass ratio of the viscose fiber containing the cooling agent (composed of 30% by weight of paraffin phase change capsules and viscose basic fiber and purchased from Shanghai Rio fiber enterprises, development Limited) is 50%. The cross section of the polylactic acid fiber is circular, the average length of the polylactic acid fiber is 38mm, the cross section of the viscose fiber is circular, and the average length of the viscose fiber is 38 mm. The fineness of the polylactic acid fiber is 1.56 denier, and the fineness of the viscose fiber is 6 denier.

Opening and mixing polylactic acid fibers and viscose fibers according to the proportion, then pre-carding on a cotton type carding machine, and setting basic parameters of carding: the speed of the cotton feeding roller is 0.4 r/min; the speed of the licker-in is 570.66 r/min; the speed of the cylinder is 550.00 r/min; the speed of the doffer is 7.5 r/min; the net outlet speed is 4.12 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2.04HZ, 12.98HZ doffer and 20.15HZ. cylinder into a needle machine for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the water pressure of a first spunlace is controlled to be 5MPa, the water pressure of a second spunlace is controlled to be 6.5MPa, and the production speed is 10 m/min; drying the spunlaced mixed nonwoven material, and then performing hot rolling finishing at 160 ℃ to obtain the polylactic acid fiber nonwoven material for the non-combustible cigarette.

The enclosed pressure drop of the bar flue gas cooling unit is 94mmH₂O, the void ratio is 80%.

The filter 40 is a conventional cellulose acetate tow rod 8mm in length having an outer diameter of about 7.2mm and an inner diameter of about 6.9 mm.

As shown in fig. 2, the aerosol-generating article has a heating element inserted into the aerosol atomization unit at the side thereof to heat the tobacco material in the aerosol atomization unit and release volatile compounds from the tobacco material. The consumer draws on the mouth end 12 of the aerosol-generating article 10 and the volatile compounds are atomised by condensation to form an aerosol which is delivered to the consumer's mouth via the wand 11. The aerosol is drawn through the smoke cooling unit 30 for heat exchange and the temperature of the aerosol is reduced.

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 3.

Table 3 mainstream aerosol temperature test results

Example 4

Immediately downstream of the aerosol atomizing unit 20, the flue gas cooling unit 30 is a rod of non-woven material containing phase change fibers surrounded by a plug wrap 31. The porous rod has a length of approximately 25mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The nonwoven material of this example has a grammage of about 280g/m²And the thickness is 0.47 mm. The viscose fibers (comprising 30 wt% of paraffin phase change capsules and viscose basic fibers, purchased from Shanghai Rio fiber enterprises, Ltd.) have the mass ratio of 100%, the cross sections of the fibers are circular, the average length of the fibers is 38mm, and the fiber fineness is 10 denier.

Opening and mixing viscose fibers, then pre-carding on a cotton type carding machine, and setting basic parameters of carding: the speed of the cotton feeding roller is 0.45 r/min; the speed of the licker-in is 580 r/min; the speed of the cylinder is 560.00 r/min; the speed of the doffer is 7.72 r/min; the net outlet speed is 4.02 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2.01HZ, 13.0HZ and 20.12HZ. cylinder into a needle machine for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the water pressure of a first spunlace is controlled to be 5MPa, the water pressure of a second spunlace is controlled to be 6.5MPa, and the production speed is 8 m/min; drying the spunlaced mixed non-woven material, and then performing hot rolling finishing at the temperature of 170 ℃ to obtain the base fiber non-woven material containing the phase change material for the non-combustible cigarette viscose.

The enclosed pressure drop of the bar flue gas cooling unit is 112mmH₂O, the void ratio is 78%.

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 4.

Table 4 mainstream aerosol temperature test results

Example 5

As shown in figure 3, a four-stage aerosol-generating article 10 having a smoke temperature reducing unit comprises four units: aerosol atomization unit 20, hollow cellulose acetate tube 60, smoke cooling unit 30, and filter 40. These four units are sequentially assembled coaxially into a rod 11 tightly wrapped with cigarette paper 50. The aerosol atomization unit 20 is positioned at the far end 13 of the rod; the hollow cellulose acetate tube 60 is downstream of the aerosol atomization unit; the flue gas cooling unit 30 is positioned at the downstream of the hollow cellulose acetate tube; the filter 40 is downstream of the smoke cooling unit and the rod 11 has a mouth end 12. When compositely assembled by a cigarette making machine, the rod 11 has a length of approximately 45 mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. The aerosol atomizing unit 20 comprises a filamentary or pleated tobacco material, rolled by a cigarette making machine, wrapped in filter paper (not shown) to form a rod. The tobacco material comprises additives, wherein the additives comprise aerosol-forming additives such as glycerin and propylene glycol. The hollow acetate tube 60, immediately downstream of the aerosol atomization unit, is made of cellulose acetate. The aerosol is firstly mixed and buffered for cooling in the hollow section.

The flue gas cooling unit 30 is located downstream of the hollow tube 60 and is a rod of non-woven material containing phase change fibers. In this embodiment, the flue gas temperature reduction unit 30 has a length of approximately 18mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The gram weight of the composite polylactic acid fiber non-woven material of the embodiment is about 245g/m²And the thickness is 0.46 mm. The mass ratio of the polylactic acid fiber is 50%, and the mass ratio of the acrylic fiber containing the cooling agent (composed of 40% by weight of paraffin phase change capsules and viscose basic fiber and purchased from Shanghai Rio fiber enterprises, development Co., Ltd.) is 50%. The cross section of the polylactic acid fiber is circular, the average length of the polylactic acid fiber is 38mm, and the cross section of the acrylic fiber is circular, and the average length of the acrylic fiber is 38 mm. The fineness of the polylactic acid fiber is 1.56 denier, and the fineness of the acrylic fiber is 15 denier.

Opening and mixing polylactic acid fiber and acrylic fiber according to the proportion, then pre-carding on a cotton type carding machine, and setting basic parameters of carding: the speed of the cotton feeding roller is 0.45 r/min; the speed of the licker-in is 580.07 r/min; the speed of the cylinder is 560.00 r/min; the speed of the doffer is 7.8 r/min; the net outlet speed is 3.92 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2.05HZ, 13.08HZ doffer and 20.24HZ. cylinder into a needle loom for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the water pressure of the first spunlace is controlled to be 5MPa, the water pressure of the second spunlace is controlled to be 6.5MPa, and the production speed is 8 m/min; drying the spunlaced mixed nonwoven material, and then performing hot rolling finishing at the temperature of 170 ℃ to obtain the composite polylactic acid fiber nonwoven material for the non-combustible cigarette.

And then the non-woven material is processed on a paper filter stick forming machine according to the proportion of 1:4, and then adjusting the retraction ratio to 0.71. And then wrapping the filter stick with wrapping paper with the gram weight of 20g and the thickness of 0.08mm, and cutting into small sections with the length of 120 mm.

The enclosed pressure drop of the bar flue gas cooling unit is 100mmH₂O, porosity was 79%.

The hollow tube 60 is made of cellulose acetate. The length is 7mm, the outer diameter of the hollow tube is 7.12mm, and the inner diameter is 3.5 mm.

As shown in fig. 3, the aerosol-generating article has a heating element inserted into the aerosol atomization unit at the side thereof to heat the tobacco material in the aerosol atomization unit and cause the release of volatile compounds from the tobacco material. The consumer draws on the mouth end 12 of the aerosol-generating article 10 and the volatile compounds are atomised by condensation to form an aerosol which is delivered to the consumer's mouth via the wand 11. The aerosol is drawn through the smoke cooling unit 30 for heat exchange and the temperature of the aerosol is reduced.

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 5.

Table 5 mainstream aerosol temperature test results

Example 6

The flue gas cooling unit 30 is located downstream of the hollow tube 60 and is a rod of non-woven material containing phase change fibers. In this embodiment, the flue gas cooling unit 30 has a length of approximately 18mm and a large outer diameterAbout 7.2mm and an inner diameter of about 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The gram weight of the composite acetate fiber non-woven material of the embodiment is about 268g/m²And the thickness is 0.47 mm. The mass ratio of the acetate fiber is 50%, the mass ratio of the viscose fiber containing the cooling agent (which consists of 30% by weight of paraffin phase change capsules and viscose basic fiber and is purchased from Shanghai Rio fiber enterprises, development Limited) is 35%, and the mass ratio of the polylactic acid fiber is 15%. Wherein, the fineness of the acetate fiber is 8 deniers, the fineness of the viscose fiber is 6 deniers, and the fineness of the polylactic acid fiber is 1.56 deniers. The cross section of the acetate fiber is Y-shaped, and the average length of the acetate fiber is 38 mm; the cross section of the polylactic acid fiber is circular, the average length of the polylactic acid fiber is 38mm, the cross section of the basic fiber containing the phase-change material of the viscose is circular, and the average length of the basic fiber containing the phase-change material of the viscose is 38 mm.

Opening and mixing cellulose acetate fibers, polylactic acid fibers and viscose fibers according to the proportion, then pre-carding on a cotton type carding machine, and setting basic parameters of carding: the speed of the cotton feeding roller is 0.44 r/min; the speed of the licker-in is 588 r/min; the speed of the cylinder is 575.00 r/min; the speed of the doffer is 7.8 r/min; the net outlet speed is 4 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2HZ, doffer 14HZ and cylinder 20HZ. into a needle machine for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the water pressure of a first spunlace is controlled to be 5MPa, the water pressure of a second spunlace is controlled to be 6.5MPa, and the production speed is 8 m/min; drying the spunlaced mixed nonwoven material, and then performing hot rolling finishing at 165 ℃ to obtain the composite acetate fiber nonwoven material for the non-combustible cigarette.

The enclosed pressure drop of the bar flue gas cooling unit is 98mmH₂O, porosity was 75%.

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 6.

TABLE 6 mainstream aerosol temperature test results

Example 7

The flue gas cooling unit 30 is downstream of the aerosol atomization unit and is a rod of non-woven material containing phase change fibers wrapped by a plug wrap 31. The porous rod has a length of approximately 33mm, an outer diameter of approximately 7.2mm and an inner diameter of approximately 6.9 mm. In this embodiment, the smoke cooling unit is formed by gathering the non-woven material wrapped by the forming paper into a cylindrical structure. The gram weight of the composite acetate fiber non-woven material of the embodiment is about 75g/m²And the thickness is 0.522 mm. Wherein, the fineness of the acetate fiber is 3 deniers, and the fineness of the PLA fiber is 1.56 deniers. The mass ratio of the PLA fiber is 50%, and the mass ratio of the acetate fiber is 50%. The cross section of the acetate fiber is Y-shaped, and the average length of the acetate fiber is 38 mm; the PLA fiber is circular in cross section and 38mm in average length.

Opening and mixing the acetate fibers and the viscose fibers according to the set proportion, then pre-carding on a cotton type carding machine, and setting the basic parameters of carding: the speed of the cotton feeding roller is 0.4 r/min; the speed of the licker-in is 578.5 r/min; the speed of the cylinder is 558.00 r/min; the speed of the doffer is 7.60 r/min; the net outlet speed is 4.15 r/min; then carding the fiber net again before fixing the net through a GSA-500 carding machine, and setting basic parameters as follows: feeding 2.08HZ, 13.20HZ and 20.20HZ. cylinders into a needle machine for pre-needling by adopting a cross lapping mode, and then passing through a spunlace system, wherein the water pressure of a first spunlace is controlled to be 5MPa, the water pressure of a second spunlace is controlled to be 6.5MPa, and the production speed is 8 m/min; drying the spunlaced mixed nonwoven material, and then performing hot rolling finishing at the temperature of 170 ℃ to obtain the composite acetate fiber nonwoven material for the non-combustible cigarette.

The filter rod of nonwoven material had a percent void fraction of 82% and a closed draw resistance of 96mmH2O (120mm length).

Simulated smoking was performed according to the cigarette smoking model specified in the national standard GB/T19609-2004 using the Canadian deep draw mode (HCI). The effect of the smoke cooling unit on the temperature of mainstream aerosol drawn from each puff was examined and compared to a reference aerosol-generating article comprising cellulose acetate tow (see figure 4). The thermocouple temperature probe was located 5mm from the mouth end at the center of the filter 40. The test results are shown in Table 7.

TABLE 7 mainstream aerosol temperature test results

As shown in fig. 4, a prior art four-segment aerosol-generating article 10 (reference sample) comprises four units: an aerosol atomizing unit 20, a hollow cellulose acetate tube 60, a high single denier cellulose acetate filter plug 72, and a filter 40. The aerosol atomization unit 20 is positioned at the far end 13 of the rod; the hollow cellulose acetate tube 60 is downstream of the aerosol atomization unit; the high single denier cellulose acetate filter rod 72 is downstream of the hollow cellulose acetate tube 60; filter 40 is downstream of a plug 72 of high denier cellulose acetate, the mouth end 12 of rod 11. The four units are sequentially assembled coaxially to form rod 11 by tightly wrapping cigarette paper 50.

Therefore, the aerosol generating structure capable of reducing the smoke temperature of the novel heating non-combustible cigarette comprises a tobacco shred section and a filter stick cooling section formed by gathering non-woven materials. The cooling section of the filter stick comprises a gap through which cigarette smoke can pass. The cooling section is made by folding a non-woven fabric with fluff on the surface. The fluff is contacted with the fluff, and the gap through which the cigarette smoke can pass is a three-dimensional and nonlinear gap. The filter stick comprises a non-woven material with a phase change function and a wrapping material. The non-woven material is formed by mixing single fibers or multi-component fibers, wherein at least one fiber is a fiber with a phase change function.

The embodiments described above are intended to facilitate the understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.

Claims

1. An aerosol generating structure comprising an aerosol atomizing unit and a flue gas cooling unit; the method is characterized in that: the cooling structure in the smoke cooling unit comprises a filter stick with a phase change function, the filter stick comprises a gap through which cigarette smoke can pass, and the gap through which cigarette smoke can pass is a three-dimensional, through and nonlinear gap;

the filter stick comprises a non-woven material and a wrapping material; the non-woven material is folded to form a cylinder shape, the wrapping material wraps the outside to form the filter stick with a cylinder structure, the non-woven material is provided with fluff in a sheet shape, and the fluff are mutually contacted to form a three-dimensional structure; the non-woven material has pores inside the fiber and between the fibers;

the non-woven material is formed by mixing multi-component fibers; at least one of which is a fiber having a phase change function.

2. An aerosol-generating structure according to claim 1, wherein: the non-woven material can reduce the temperature of cigarette smoke and has low adsorption rate to effective components in the cigarette smoke.

3. An aerosol-generating structure according to claim 1, wherein: the nonwoven material has a thickness of 0.8mm or less.

4. An aerosol-generating structure according to claim 1, wherein: the fibers comprise cellulose diacetate fibers, and the fibers with the phase change function are PLA fibers, PE fibers, polyester fibers, polyamide fibers and base fibers containing phase change materials.

5. An aerosol-generating structure according to claim 1, wherein: the circumference of the filter stick is 18 mm-28 mm.

6. An aerosol-generating structure according to claim 1, wherein: the porosity of the filter stick is 20% -90%.

7. An aerosol-generating structure according to claim 4, wherein: the cross-sectional shape of the fiber comprises a Y shape, a circular shape and an X shape.

8. An aerosol-generating structure according to claim 4, wherein: the fibers have a linear density of 1 denier to 40 denier.

9. An aerosol-generating structure according to claim 4, wherein: the fibers have a length of 15mm to 80 mm.

10. An aerosol-generating structure according to claim 4, wherein: the base fiber containing the phase-change material has the functions of absorbing, storing and releasing heat in a latent heat mode, and can be converted into a solid state and a liquid state in temperature change, so that the effects of absorbing and releasing heat are achieved.

11. An aerosol-generating structure according to claim 4, wherein: the basic fiber containing the phase-change material is prepared by organically combining the phase-change material and the basic fiber through a composite spinning method, a hollow fiber filling method and a microcapsule coating method spinning technology.

12. An aerosol-generating structure according to claim 4, wherein: according to the mass percentage, the mass of the phase change material is 15-70% of the base fiber containing the phase change material.

13. An aerosol-generating structure according to claim 4, wherein: the phase change material is a substance which changes the state of a substance and can provide latent heat under the condition of constant temperature, and comprises an inorganic phase change material and an organic phase change material.

14. An aerosol-generating structure according to claim 13, wherein: the inorganic phase-change material comprises MgCl₂·6H₂O、CaCl₂·6H₂O、Na₂SO₄·10H₂O、Na₂HPO₄·12H₂O。

15. An aerosol-generating structure according to claim 13, wherein: the organic phase-change material comprises organic acid esters, polyhydric alcohols, higher alkanes and organic esters.

16. An aerosol-generating structure according to claim 13, wherein: the organic phase change material comprises paraffin, polyethylene glycol, stearic acid-stearyl ester, trimethylolethane and neopentyl glycol.

17. An aerosol-generating structure according to claim 11, wherein: the basic fiber comprises cotton, polyester cotton, wool, polypropylene fiber, acrylic fiber, cellulose fiber, polyester fiber, polyurethane fiber and polylactic acid fiber.

18. An aerosol-generating structure according to claim 1, wherein: the wrapping material is filter stick wrapping paper with the gram weight of 20 g-40 g and the thickness of 0.08 mm-0.12 mm.

19. An aerosol-generating structure according to claim 1, wherein: the device also comprises a hollow pipe part which is positioned between the aerosol atomization unit and the smoke cooling unit and is connected with the aerosol atomization unit and the smoke cooling unit.

20. An aerosol-generating structure according to claim 1 or 19, wherein: the filter tip part is connected with the smoke cooling unit; the filter tip part is positioned at the downstream of the smoke cooling unit; downstream is the spatial orientation defined by the direction of smoke flow, which refers to the relative position closer to the smoker's mouth when smoking.

21. An aerosol-generating structure according to claim 19, wherein: the filter stick is an acetate fiber filter stick; the hollow pipe part is an acetate fiber hollow filter tip.

22. A method of making an aerosol-generating structure according to any of claims 1 to 19, wherein: and cutting the smoke cooling unit to a fixed length and then combining the cut smoke cooling unit with other components.

23. A method of producing an aerosol-generating structure according to claim 22, wherein:

the preparation of the filter stick with the phase change function in the smoke cooling unit comprises the following steps: the method comprises the following steps of extracting a non-woven material, leveling the air flow of the non-woven material, clamping and conveying the non-woven material by a pair of rollers, drafting the non-woven material by a pair of rollers through threads, applying a plasticizer and a cooling agent, retracting and finishing the non-woven material, conveying the non-woven material by a high-pressure nozzle, wrapping the non-woven material by forming paper, and cutting a non-woven material filter stick to a fixed length by a cutter.

24. Use of an aerosol-generating structure according to any of claims 1 to 19 in a cigarette and in a heat-not-burn cigarette.