Lyocell fiber tow for heat-not-burn cigarette filter tip and preparation me thod, heat-not-burn cigarette and filter tip

Abstract

A lyocell fiber tow for a heat-not-burn cigarette filter tip and a preparation method therefor, a heat-not-burn cigarette and a filter tip. The denier per filament of the lyocell fiber tow is controlled in the range from 10.0 D to 30.0 D, the total denier of the tow is controlled in the range of 10000 D to 40000 D depending on the circumference of a filter stick, and the cross section of the lyocell fiber tow is elliptical or circular. Since the lower the denier per filament of the fiber tow, the higher the number of monofilaments, the greater the chance of collision between vape smoke and fibers during movement, and the higher the filtration efficiency of the filter tip, the lyocell fiber tow uses a high-denier-per-filament tow design to reduce the filtration effect thereof; when the denier per filament of the fiber tow remains unchanged, the filtration efficiency increases as the total denier of the fiber tow increases, therefore the lyocell fiber tow uses a low-total-denier design to increase the transmission efficiency for vape smoke; and since the cross section of the lyocell fiber tow is elliptical or circular, the specific surface area can be reduced, thereby achieving a high-permeability effect.

Description

Lyocell fiber tow for heat-not-burn cigarette filter and preparation method, heat-not-burn cigarette and filter Technical Field

[0001] The present application relates to the technical field of heat-not-burn cigarettes, and in particular to a lyocell fiber tow for a heat-not-burn cigarette filter and a preparation method thereof, a heat-not-burn cigarette, and a filter. Background Art

[0002] Heat-not-burn cigarettes are a new type of tobacco product. When smoked, the heat-not-burn cigarette cartridge is heated but not combusted. During heating, an aerosol is formed, and the atomizer, nicotine, and flavoring substances evaporate to produce smoke. Heat-not-burn cigarettes are generally divided into a core segment, a support segment, and a filter. Heat-not-burn cigarettes heat the cartridge with a heat source to produce smoke, generating smoke for consumers to inhale in a non-combustion state. This unique method reduces the harmful smoke components produced by combustion and thermal decomposition in conventional cigarettes and does not produce sidestream smoke. Since the core segment of heat-not-burn cigarettes can produce relatively little useful smoke, and the amount of smoke directly affects the consumer's smoking experience, the filter design of heat-not-burn cigarettes is mainly aimed at reducing smoke filtration, that is, preparing highly transparent filters.

[0003] The low permeability is indirectly reflected in the draw resistance of the cigarette. The draw resistance of the entire heat-not-burn cigarette is composed of two parts: the wick draw resistance and the filter draw resistance. The wick draw resistance is determined by the arrangement order and filling amount of the tobacco shreds. Due to the need to consider the nicotine problem in the smoke, there is an extreme low value. Therefore, to achieve a high permeability of the smoke of heat-not-burn cigarettes, the key lies in the material selection and structural design of the filter.

[0004] Currently, the materials used for heat-not-burn cigarette filters on the market mainly include acetate, polylactic acid (PLA), and semi-crepe paper. Among them, polylactic acid is not heat-resistant and is therefore more susceptible to thermal collapse when used as a filter material. Acetate, when used as a filter material, also faces the risk of thermal collapse even when meeting the conditions of high permeability. Although acetate is a biodegradable material, its degradation time is as long as 1 to 2 years, requiring a considerable amount of time to fully biodegrade. Semi-crepe paper filter rods are cheaper to use in traditional cigarettes and have a stronger ability to remove tar and nicotine than acetate. However, semi-crepe paper filters face the contradiction between draw resistance and end face voids. To achieve a lower draw resistance, many voids are generated on the cross-section of the filter rod. At the same time, paper filters also produce a noticeable and unpleasant woody smell when smoking heat-not-burn cigarettes.

[0005] Summary of the Invention

[0006] The purpose of the present application is to provide a lyocell fiber tow for heat-not-burn cigarette filters and a preparation method, a heat-not-burn cigarette and a filter, so as to solve the problems existing in the materials used in the above-mentioned existing heat-not-burn cigarette filters.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] The present application first provides a lyocell fiber tow for a heat-not-burn cigarette filter, wherein the single denier of the lyocell fiber tow is controlled within the range of 10.0D-30.0D, and the total denier of the lyocell fiber tow is controlled within the range of 10000D-40000D according to the required circumferential size of the filter rod, and the cross-section of the lyocell fiber tow is elliptical or circular.

[0009] Preferably, the eccentricity e of the ellipse is in the range of 0 <e<1。

[0010] The present application also provides a method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter, comprising:

[0011] The N-methylmorpholine-N-oxide aqueous solution is mixed with the natural fiber slurry and fed into a twin-screw extruder to prepare a lyocell spinning solution;

[0012] The lyocell spinning solution is filtered and then wet-spinned using a spinneret with multiple holes, the lyocell spinning solution is kept at a spinning temperature of 100° C. to 110° C. at the spinning nozzle of the spinneret, and the discharge amount and spinning rate of the lyocell spinning solution are adjusted so that the fineness of the single filament used for the final lyocell fiber is within a range of 10.0 denier to 30.0 denier;

[0013] The filamentous spinning solution discharged from the spinning nozzle is cooled and solidified to obtain lyocell fiber precursor;

[0014] washing, oiling and drying the lyocell fiber raw yarn;

[0015] The treated lyocell fiber raw yarn is crimped to produce the above-mentioned lyocell fiber tow for heat-not-burn cigarette filter.

[0016] Preferably, the lyocell fiber tow has 15 to 30 crimps per inch.

[0017] Preferably, the cooling and solidification includes supplying the filamentous spinning solution to a coagulation liquid in a coagulation bath via an air gap zone.

[0018] Preferably, the temperature of the coagulation liquid is less than or equal to 30°C.

[0019] The present application also provides a heat-not-burn cigarette filter, which includes the above-mentioned lyocell fiber tow for heat-not-burn cigarette filter.

[0020] Preferably, the heat-not-burn cigarette filter is formed by rolling the above-mentioned lyocell fiber tow for heat-not-burn cigarette filters and forming paper.

[0021] Preferably, the draw resistance of the heat-not-burn cigarette filter is in the range of 2 Pa / mm-20 Pa / mm.

[0022] The present application also provides a heat-not-burn cigarette, comprising the above-mentioned heat-not-burn cigarette filter.

[0023] Compared with the prior art, the advantages of this application include:

[0024] The single denier of the lyocell fiber tow for heat-not-burn cigarette filter provided by the present application is controlled within the range of 10.0D-30.0D, and the total denier of the tow is controlled within the range of 10000D-40000D according to the required filter rod circumference size, and its cross-section is elliptical or circular. Among them, the lower the single denier of the fiber tow, the more the number of monofilaments, the more chances of collision between the smoke and the fiber during motion, and the higher the filter filtration efficiency. Therefore, the lyocell fiber tow for heat-not-burn cigarette filter of the present application adopts a high single denier tow design to increase the permeation efficiency of the smoke. When the single denier of the fiber tow remains unchanged, the filtration efficiency also increases with the increase of the total denier of the fiber tow. Therefore, the lyocell fiber tow for heat-not-burn cigarette filter of the present application adopts a low total denier design to reduce its filtration effect. Moreover, the different shapes of the cross-sections of the fiber tows result in different specific surface areas, which will also affect the filtration efficiency of the cigarette filter rods. The fiber tows with irregular cross-sections have large specific surface areas, and the filtration efficiency of the filter rods after molding is also high, which to a certain extent leads to problems such as low smoke concentration and poor satisfaction in heat-not-burn cigarettes. Therefore, the lyocell fiber tows used for heat-not-burn cigarette filters in the present application adopt an elliptical or circular cross-section, which can reduce the specific surface area and thus achieve a high permeability effect. The elliptical or circular cross-section of the tow can also achieve physical extinction, and the prepared filter has a better visual effect. Compared with cellulose acetate tows, lyocell fibers have better biodegradability, so they can alleviate the garbage problem caused by cigarette butts discarded after smoking.

[0025] The heat-not-burn cigarette filter prepared from the lyocell fiber tow for the heat-not-burn cigarette filter of the present application has high permeability, low pressure drop, no thermal collapse, is completely biodegradable, and is environmentally friendly and pollution-free.

[0026] The heat-not-burn cigarette prepared by the heat-not-burn cigarette filter of the present application solution has a high smoke concentration and a good sense of satisfaction when smoking, and does not produce unpleasant feelings such as woody smell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0028] FIG1 is a cross-sectional view of a lyocell fiber tow of the present application;

[0029] Figure 2 is a physical picture of the acetate filter after smoking;

[0030] Figure 3 is a physical picture of the Lyocell fiber filter after suction. DETAILED DESCRIPTION

[0031] As used herein:

[0032] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0033] The conjunction "consisting of" excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim, rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0034] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed alone. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0035] In these examples, parts and percentages are by mass unless otherwise indicated.

[0036] "Parts by mass" refers to the basic unit of measurement used to express the mass ratio of multiple components. One part can represent any unit of mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, this means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, we could say that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number representing a multiplication factor). It's important to note that, unlike parts by mass, the sum of the mass of all components is not limited to 100 parts.

[0037] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0038] Lyocell fiber is made from naturally inexhaustible resources like wood and bamboo, and its manufacturing process is environmentally friendly. It combines the comfort of cotton with the strength of polyester, the luxurious aesthetic of wool, and the unique touch and soft drape of silk. Its exceptional toughness, whether wet or dry, makes it widely used in clothing. However, Lyocell fiber is rarely used in cigarettes, and even less so in heat-not-burn cigarette filters.

[0039] The present application first provides a lyocell fiber tow for a heat-not-burn cigarette filter. The single denier of the lyocell fiber tow is controlled within the range of 10.0D-30.0D, for example, it can be 10.0D-20.0D, or 20.0D-30.0D, or 15.0D-25.0D. According to the required circumferential size of the filter rod, the total denier of the lyocell fiber tow is controlled within the range of 10000D-40000D, for example, it can be 10000D-2000D, or 20000D-30000D, or 30000D-40000D. The cross-section of the lyocell fiber tow is elliptical or circular.

[0040] Single denier refers to the thickness of individual fibers in a fiber bundle, which is affected by the fiber diameter. Total denier refers to the number of fibers in a fiber bundle, which is affected by the twist of the fiber bundle. The mass (g) of 9000m of fiber is called denier (D).

[0041] Among them, the lower the denier of the fiber tow, the more the number of monofilaments, the more opportunities for the flue gas to collide with the fibers during movement, and the higher the filtration efficiency of the filter tip. Therefore, the lyocell fiber tow used in the filter tip of the heat-not-burn cigarette in the solution of the present application adopts a high-denier tow design, and the denier is controlled within the range of 10.0 D - 30.0 D to reduce its filtration effect. The fineness of the lyocell monofilament is 10.0 denier to 30.0 denier. If the fineness of the monofilament is less than 10.0 denier, the draw resistance of the heat-not-burn cigarette filter tip is too high; on the other hand, if its fineness exceeds 30.0 denier, the draw resistance of the heat-not-burn cigarette filter tip is too low. Considering these characteristics, the fineness of the fiber varies according to the type of cigarette, and within the above fineness range, the fineness can be selectively applied according to the type of cigarette.

[0042] When the denier of the fiber tow remains unchanged, with the increase of the total denier of the fiber tow, the filtration efficiency also increases. Therefore, the lyocell fiber tow used in the filter tip of the heat-not-burn cigarette in the solution of the present application adopts a low-total-denier design, and the total denier is controlled within the range of 10000 D - 40000 D to reduce its filtration effect.

[0043] Moreover, when the cross-sectional shape of the fiber tow is different, its specific surface area is different, which will also affect the filtration efficiency of the cigarette filter rod; the fiber tow with a special-shaped cross-section has a large specific surface area, and the filtration efficiency of the filter rod after forming is also high, which will cause problems such as low flue gas concentration and poor satisfaction in heat-not-burn cigarettes to a certain extent. Therefore, the lyocell fiber tow used in the filter tip of the heat-not-burn cigarette in the solution of the present application adopts an elliptical or circular cross-section, which can reduce the specific surface area and thus achieve the effect of high permeability.

[0044] Preferably, please refer to FIG. 1, the range of the eccentricity e of the ellipse is 0 < e < 1, where when e is 0, the cross-section is circular, and the ellipse can be an ellipse of any shape with 0 < e < 1.

[0045] The elliptical or circular cross-sectional shape can not only reduce the specific surface area of the fiber tow and achieve the effect of high permeability; moreover, for the fiber tow with an elliptical or circular cross-section, due to the reflection and refraction of light inside the fiber, a certain optical path difference will be formed. Therefore, for light of certain wavelengths, an interference fringe phenomenon will occur in the fiber bundle, thereby achieving extinction, making the incident light diffuse reflect in different directions, and thus reducing the gloss intensity on the fiber surface and making the appearance of the tow comfortable.

[0046] In the prior art, usually during the synthesis of synthetic fibers, adding titanium dioxide delustering agent to make its gloss soft and natural is a common method. However, the International Agency for Research on Cancer (IARC) has stated that inhaling titanium dioxide may be a carcinogenic factor, and due to its influence during oral contact (or ingestion), it remains to be debated whether titanium dioxide can be used as a food additive. Therefore, the lyocell fiber tow used in the filter tip of the heat-not-burn cigarette is not suitable for delustering with titanium dioxide.

[0047] The present application also provides a method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter, comprising:

[0048] The N-methylmorpholine-N-oxide aqueous solution is mixed with the natural fiber slurry and fed into a twin-screw extruder to prepare a lyocell spinning solution;

[0049] The lyocell spinning solution is filtered and then wet-spun using a spinneret with multiple holes to obtain the lyocell multifilament yarn of the present application. The lyocell spinning solution is kept at a spinning temperature of 100° C. to 110° C. at the spinning nozzle of the spinneret, and the discharge amount and spinning rate of the lyocell spinning solution are adjusted so that the fineness of the single filament used for the final lyocell fiber is within a range of 10.0 denier to 30.0 denier.

[0050] The filamentous spinning solution discharged from the spinning nozzle is cooled and solidified to obtain lyocell fiber precursor;

[0051] washing, oiling and drying the lyocell fiber raw yarn;

[0052] The treated lyocell fiber raw yarn is crimped to produce the above-mentioned lyocell fiber tow for heat-not-burn cigarette filter.

[0053] Preferably, the lyocell fiber tow has 15 to 30 crimps per inch, for example, 15, 15.5, 16, 16.5, 18, 18.5, 20, 20.5, 22, 22.5, 25, 25.5, 26, 26.5, 28, 28.5 or 30 crimps per inch, or any value between 15 and 30. More preferably, it has 25 to 30 crimps per inch.

[0054] The number of crimps per inch is considered important to meet the performance requirements of heat-not-burn cigarette filters. If the crimp number is less than 15 per inch, the tow is not easily opened during the heat-not-burn cigarette filter manufacturing process, leading to processing problems. In addition, the required performance of heat-not-burn cigarette filters, such as draw resistance, filter hardness, and filter removal performance, is unsatisfactory. On the other hand, if the crimp number exceeds 30 per inch, uneven compression occurs in the stuffing box and the tow cannot be effectively passed, making it difficult to obtain a crimped tow.

[0055] Preferably, the cooling and solidification includes supplying the filamentous spinning solution to a coagulation liquid in a coagulation bath via an air gap zone.

[0056] Preferably, the temperature of the coagulation liquid is less than or equal to 30°C.

[0057] Preferably, while cooling and solidifying to obtain the lyocell fiber precursor, the N-methylmorpholine-N-oxide is recovered, and the recovery rate of the N-methylmorpholine-N-oxide reaches more than 99.5%.

[0058] Preferably, the natural fiber raw material is selected from any one of wood fiber raw materials, bamboo fiber raw materials and cotton fiber raw materials.

[0059] The present application also provides a heat-not-burn cigarette filter, comprising the aforementioned lyocell fiber tow for heat-not-burn cigarette filters. The heat-not-burn cigarette filter can be formed solely by rolling the lyocell fiber tow for heat-not-burn cigarette filters with a forming paper, or the heat-not-burn cigarette filter can also comprise a portion of its structure from the lyocell fiber tow for heat-not-burn cigarette filters and include other filter structures.

[0060] The heat-not-burn cigarette filter prepared from the lyocell fiber tow for the heat-not-burn cigarette filter of the present application has high permeability, low pressure drop, good smoking experience, and the filter will not collapse due to heat. It is fully biodegradable and environmentally friendly and pollution-free.

[0061] Preferably, the heat-not-burn cigarette filter is formed by rolling the aforementioned lyocell fiber tow for heat-not-burn cigarette filters with forming paper. Using the lyocell fiber tow for heat-not-burn cigarette filters, a heat-not-burn cigarette filter with high permeability, low pressure drop, and a good smoking experience can be directly rolled without combining it with other filter structures. Conventional methods of preparing heat-not-burn cigarette filters using acetate fiber tow, even if the acetate fiber tow also adopts a high single denier and low total denier design, often fail to meet the requirements. For example, there are still problems such as insufficient cooling effect, poor pressure drop stability, and susceptibility to thermal collapse.

[0062] Preferably, the average draw resistance of the heat-not-burn cigarette filter is designed to be in the range of 2 Pa / mm-20 Pa / mm, for example, 2 Pa / mm-8 Pa / mm, or 5 Pa / mm-10 Pa / mm, or 10 Pa / mm-20 Pa / mm, or 8 Pa / mm-15 Pa / mm. Depending on the design requirements of the cigarette, the design requirement of 2 Pa / mm-20 Pa / mm is met, not the fluctuation range of the filter rod draw resistance.

[0063] The present application also provides a heat-not-burn cigarette, comprising the above-mentioned heat-not-burn cigarette filter.

[0064] The heat-not-burn cigarettes prepared by the heat-not-burn cigarette filter of the present application have a high smoke concentration and a good sense of satisfaction when smoking, and because lignin is removed from lyocell fiber during the production process, no unpleasant sensations such as woody smell are produced.

[0065] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, the conditions are carried out according to conventional conditions or manufacturer recommendations. The reagents or instruments used are not specified by the manufacturer and are conventional products that can be purchased commercially.

[0066] Example 1

[0067] Example 1 First, a lyocell fiber tow for a heat-not-burn cigarette filter is provided, wherein the single denier is controlled at 10.0D, the total denier is controlled at 16000D, the cross-section of the lyocell fiber tow is elliptical, and the eccentricity e of the ellipse is 0.1.

[0068] Example 1 also provides a method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter, comprising:

[0069] The bamboo fiber raw material is purified by chemical processing to obtain natural fiber pulp;

[0070] The N-methylmorpholine-N-oxide aqueous solution is mixed with the natural fiber slurry and fed into a twin-screw extruder to prepare a lyocell spinning solution;

[0071] The lyocell spinning solution is filtered and then wet-spun using a spinneret with multiple holes. The lyocell spinning solution is kept at a spinning temperature of 105° C. at the spinning nozzle of the annular spinneret. The spinning is then performed while adjusting the discharge amount of the spinning solution and the spinning rate so that the fineness of the final lyocell monofilament is 10.0 denier.

[0072] The filamentous spinning solution discharged from the spinning nozzle is supplied to the coagulation liquid in the coagulation bath through the air gap zone to cool and coagulate to obtain lyocell fiber precursor, wherein the temperature of the coagulation liquid is less than or equal to 30°C;

[0073] The filaments are fully soaked in oil and squeezed, and then dried with a drying roller at 150°C to obtain lyocell multifilaments;

[0074] The lyocell multifilament obtained above was heated while passing through a steam box, and then crimped by a pressure roller in a stuffer box to obtain the lyocell fiber tow of Example 1, with the crimp number of 15 per inch.

[0075] Example 1 also provides a heat-not-burn cigarette filter, which is made by rolling the lyocell fiber tow for the heat-not-burn cigarette filter of Example 1 and high-transparency forming paper. The filling amount of the lyocell fiber tow is between 0.4-0.5g / cigarette. The length of the filter is 120mm and the circumference is 16.8mm.

[0076] Example 1 also provides a heat-not-burn cigarette, comprising a smoking section, a supporting section, and the filter tip for the heat-not-burn cigarette of Example 1.

[0077] Example 2

[0078] Example 2 First, a lyocell fiber tow for a heat-not-burn cigarette filter is provided, wherein the single denier is controlled at 10.0D, the total denier is controlled at 25000D, the cross-section of the lyocell fiber tow is elliptical, and the eccentricity e of the ellipse is 0.1.

[0079] Example 2 also provides a method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter, comprising:

[0080] The bamboo fiber raw material is purified by chemical processing to obtain natural fiber pulp;

[0081] The N-methylmorpholine-N-oxide aqueous solution is mixed with the natural fiber slurry and fed into a twin-screw extruder to prepare a lyocell spinning solution;

[0082] The lyocell spinning solution is filtered and then wet-spun using a spinneret with multiple holes. The lyocell spinning solution is kept at a spinning temperature of 105° C. at the spinning nozzle of the annular spinneret. The spinning is then performed while adjusting the discharge amount of the spinning solution and the spinning rate so that the fineness of the final lyocell monofilament is 10.0 denier.

[0083] The filamentous spinning solution discharged from the spinning nozzle is supplied to the coagulation liquid in the coagulation bath through the air gap zone to cool and coagulate to obtain lyocell fiber precursor, wherein the temperature of the coagulation liquid is less than or equal to 30°C;

[0084] The filaments are fully soaked in oil and squeezed, and then dried with a drying roller at 150°C to obtain lyocell multifilaments;

[0085] The lyocell multifilament obtained above was heated while passing through a steam box, and then crimped by a pressure roller in a stuffer box to obtain the lyocell fiber tow of Example 2, with the crimp number of 20 per inch.

[0086] Example 2 also provides a heat-not-burn cigarette filter, which is made by rolling the lyocell fiber tow for the heat-not-burn cigarette filter of Example 2 and high-transparency forming paper. The filling amount of the lyocell fiber tow is between 0.45-0.6g / cigarette. The length of the filter is 120mm and the circumference is 19.8mm.

[0087] Example 2 also provides a heat-not-burn cigarette, comprising the same smoking segment and supporting segment as those in Example 1 and the filter for the heat-not-burn cigarette of Example 2.

[0088] Example 3

[0089] Example 3 First, a lyocell fiber tow for a heat-not-burn cigarette filter is provided, wherein the single denier is controlled at 10.0D, the total denier is controlled at 35000D, the cross-section of the lyocell fiber tow is elliptical, and the eccentricity e of the ellipse is 0.1.

[0090] The preparation method of a lyocell fiber tow for a heat-not-burn cigarette filter provided in Example 3 is carried out with reference to the preparation method in Example 1, wherein the crimp number of the obtained tow is 25 per inch.

[0091] Example 3 also provides a heat-not-burn cigarette filter, which is made by rolling the lyocell fiber tow for the heat-not-burn cigarette filter of Example 3 and high-transparency forming paper. The filling amount of the lyocell fiber tow is between 0.5-0.7g / cigarette. The length of the filter is 120mm and the circumference is 24mm.

[0092] Example 3 also provides a heat-not-burn cigarette, comprising the same smoking segment and supporting segment as those in Example 1 and the filter for the heat-not-burn cigarette of Example 3.

[0093] Example 4

[0094] Example 4 First, a lyocell fiber tow for a heat-not-burn cigarette filter is provided, wherein the single denier is controlled at 20.0D, the total denier is controlled at 35000D, the cross-section of the lyocell fiber tow is elliptical, and the eccentricity e of the ellipse is 0.1.

[0095] The preparation method of a lyocell fiber tow for a heat-not-burn cigarette filter provided in Example 4 is carried out with reference to the preparation method in Example 1, wherein the crimp number of the obtained tow is 25 per inch.

[0096] Example 4 also provides a heat-not-burn cigarette filter, which is made by rolling the lyocell fiber tow for the heat-not-burn cigarette filter of Example 4 with high-transparency forming paper. The filling amount of the lyocell fiber tow is between 0.5-0.7g / cigarette. The length of the filter is 120mm and the circumference is 24mm.

[0097] Example 4 also provides a heat-not-burn cigarette, comprising the same smoking segment and supporting segment as those in Example 1 and the filter for the heat-not-burn cigarette of Example 4.

[0098] Example 5

[0099] Example 5 First, a lyocell fiber tow for a heat-not-burn cigarette filter is provided, wherein the single denier is controlled at 30.0D, the total denier is controlled at 35000D, the cross-section of the lyocell fiber tow is elliptical, and the eccentricity e of the ellipse is 0.1.

[0100] The preparation method of a lyocell fiber tow for a heat-not-burn cigarette filter provided in Example 5 is carried out with reference to the preparation method in Example 1, wherein the crimp number of the obtained tow is 25 per inch.

[0101] Example 5 also provides a heat-not-burn cigarette filter, which is made by rolling the lyocell fiber tow for the heat-not-burn cigarette filter of Example 5 and high-transparency forming paper. The filling amount of the lyocell fiber tow is between 0.5-0.7g / cigarette. The length of the filter is 120mm and the circumference is 24mm.

[0102] Example 5 also provides a heat-not-burn cigarette, comprising the same smoking section and supporting section as those in Example 1 and the filter for the heat-not-burn cigarette of Example 5.

[0103] Comparative Example 1

[0104] Comparative Example 1: First, a heat-not-burn cigarette filter made of polylactic acid and forming paper is provided. The filter has a length of 120 mm and a circumference of 24 mm, and the filling amount of polylactic acid is between 0.5-0.7 g / cigarette.

[0105] Comparative Example 1 also provides a heat-not-burn cigarette prepared from the heat-not-burn cigarette filter of Comparative Example 1, wherein the cigarette core material and cigarette structure are consistent with those in Example 1.

[0106] Comparative Example 2

[0107] Comparative Example 2: First, a heat-not-burn cigarette filter made of acetate fiber and forming paper is provided. The single denier of the acetate fiber is controlled at 10.0D, the total denier is controlled at 35,000D, the cross-section is Y-shaped, the filter length is 120 mm, the circumference is 24 mm, and the filling amount of the acetate fiber tow is between 0.5-0.7 g / cigarette.

[0108] Comparative Example 2 also provides a heat-not-burn cigarette prepared from the heat-not-burn cigarette filter of Comparative Example 2, wherein the cigarette core material and cigarette structure are consistent with those in Example 1.

[0109] Comparative Example 3

[0110] Comparative Example 3: First, a paper filter tip is provided which is made of semi-crepe paper and forming paper. The length of the filter tip is 120 mm, the circumference is 24 mm, and the filling amount of the semi-crepe paper is between 0.5-0.7 g / piece.

[0111] Comparative Example 3 also provides a heat-not-burn cigarette prepared from the heat-not-burn cigarette filter of Comparative Example 3, wherein the cigarette core material and cigarette structure are consistent with those in Example 1.

[0112] The parameters of the heat-not-burn cigarette filters of the embodiments and comparative examples are shown in Table 1.

[0113] Table 1 Parameters of the heat-not-burn cigarette filters of the embodiments and comparative examples

[0114] The heat-not-burn cigarettes of the embodiments and comparative examples were tested, including a draw resistance test and a sensory puffing effect test. After the tests were completed, the appearance changes of the heat-not-burn cigarette filters were observed. The test results are shown in Table 2.

[0115] As shown in Table 2, the heat-not-burn cigarettes produced from the lyocell fiber tow of the present application produce high smoke yields, lack odor during inhalation, avoid conflicts between draw resistance and end-face voids, and are less susceptible to thermal collapse. The heat-not-burn cigarettes of Comparative Examples 1 to 3 produce poor smoke yields; polylactic acid, acetate, and semi-crepe paper filters are all prone to thermal collapse. Semi-crepe paper filters produce a woody odor during inhalation and also create conflicts between draw resistance and end-face voids.

[0116] Among them, the actual picture of the filter tip of Comparative Example 2 after smoking is shown in Figure 2, and it can be seen that the filter tip end face collapses due to heat. The actual picture of the filter tip of Example 1 after smoking is shown in Figure 3, and the filter tip end face is normal without thermal collapse.

[0117] Table 2 Test results of heat-not-burn cigarettes of various embodiments and comparative examples

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0119] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and to form distinct embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is intended solely to enhance understanding of the overall background of this application and should not be construed as an admission or any implication that such information constitutes prior art known to those skilled in the art.

Claims

1. A lyocell fiber tow for a heat-not-burn cigarette filter, characterized in that: The single denier of the lyocell fiber tow is controlled within the range of 10.0D-30.0D, the total denier of the lyocell fiber tow is controlled within the range of 10000D-40000D according to the circumference size required by the filter rod, and the cross-section of the lyocell fiber tow is elliptical or circular.

2. The lyocell fiber tow for heat-not-burn cigarette filter according to claim 1, characterized in that: The eccentricity e of the ellipse ranges from 0 <e<1。 3. A method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter, characterized in that: include: The aqueous solution of N-methylmorpholine-N-oxide is mixed with the natural fiber slurry and put into a twin-screw extruder to prepare a lyocell spinning solution; The lyocell spinning solution is filtered and then wet-spinned by a spinneret with multiple holes, the lyocell spinning solution is kept at a spinning temperature of 100° C. to 110° C. at the spinning nozzle of the spinneret, and the discharge amount and spinning rate of the lyocell spinning solution are adjusted so that the single filament fineness of the final lyocell fiber is within a range of 10.0 denier to 30.0 denier; The filamentary spinning solution discharged from the spinning nozzle is cooled and solidified to obtain the lyocell fiber precursor; The lyocell fiber raw yarn is subjected to water washing, oiling and drying treatments; The treated lyocell fiber raw yarn is curled to produce the lyocell fiber tow for the heat-not-burn cigarette filter according to claim 1 or 2.

4. The method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter according to claim 3, characterized in that: The lyocell fiber tow has 15 to 30 crimps per inch.

5. The method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter according to claim 3, characterized in that: The cooling and solidification includes supplying the filamentous spinning solution to a coagulation liquid in a coagulation bath via an air gap region.

6. The method for preparing a lyocell fiber tow for a heat-not-burn cigarette filter according to claim 5, characterized in that: The temperature of the coagulation liquid is less than or equal to 30°C.

7. A heat-not-burn cigarette filter, characterized in that: The heat-not-burn cigarette filter comprises the lyocell fiber tow for the heat-not-burn cigarette filter according to claim 1 or 2.

8. The heat-not-burn cigarette filter according to claim 7, characterized in that: The heat-not-burn cigarette filter is formed by rolling the lyocell fiber tow for the heat-not-burn cigarette filter according to claim 1 or 2 and forming paper.

9. The heat-not-burn cigarette filter according to claim 7, characterized in that: The draw resistance of the heat-not-burn cigarette filter is in the range of 2 Pa / mm-20 Pa / mm.

10. A heat-not-burn cigarette, characterized in that: A heat-not-burn cigarette filter comprising the heat-not-burn cigarette filter according to any one of claims 7 to 9.

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