Smoking article filter containing unmodified lyocell fiber, and smoking article containing the same

Abstract

A smoking article filter and a smoking article including the same are provided, which include a lyocell tow containing a plurality of lyocell fibers and a functional additive dispersed in the lyocell tow, wherein at least a portion of the plurality of lyocell fibers is not chemically modified by the functional additive.

Description

[Technical Field]

[0001] The present invention relates to a filter for smoking articles containing lyocell tow with a functional additive dispersed therein, and relates to a filter for smoking articles and smoking articles containing the same that have excellent biodegradability because the lyocell fiber is not chemically modified by the functional additive despite the addition of the functional additive. [Background technology]

[0002] A typical cigarette filter contains cellulose acetate tow, which is made by extracting cellulose from wood pulp and acetylating it. Cigarette filters are assembled into tobacco products, distributed to consumers, provided for smoking, and ultimately discarded after the cigarette is smoked. Some cigarette filters are also discarded directly from cigarette filter manufacturing plants as manufacturing residue. These cigarette filter wastes are collected as garbage and buried for disposal. In some cases, cigarettes are left in the natural environment without being collected as garbage.

[0003] Recently, research has been conducted to replace cellulose acetate tow with eco-friendly materials in order to protect the natural environment and reduce costs. For example, tow made from lyocell fiber, which is made by fiberizing cellulose itself, is being developed, unlike cellulose acetate.

[0004] When manufacturing smoking article filters, functional additives are added to the tow to improve filter performance. For example, phenol-related functional substances (or phenol-reducing substances) that specifically reduce phenolic substances generated during smoking are added to reduce phenolic smoke components in mainstream smoke. Conventional phenol-related functional substances, such as polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA), have been added to cellulose acetate tow. When phenol-related functional substances such as polyethylene glycol (PEG) and triethyl citrate (TEC) are added to hydrophobic cellulose acetate, the phenol-related functional substances also function as plasticizers for the cellulose acetate fibers, thereby bonding the hydrophobic cellulose acetate fibers together and reducing their biodegradability.

[0005] Even if functional additives are added to highly biodegradable lyocell tow, the lyocell fiber is not chemically modified, so there is a growing need for highly biodegradable smoking article filters.In addition, there is currently a demand for a method that can accurately analyze whether or not the lyocell fiber is chemically modified, even when functional additives are applied. Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved by the present invention is to provide a smoking article filter that is highly biodegradable, in relation to a smoking article filter containing lyocell tow with a functional additive dispersed therein, because the lyocell fibers that make up the lyocell tow are not chemically modified by the functional additive despite the addition of the functional additive.

[0007] Another problem that the present invention aims to solve is to provide a smoking article including a smoking article filter that has excellent biodegradability, in relation to a smoking article filter that includes lyocell tow in which a functional additive is dispersed, and that does not chemically modify the lyocell fibers that make up the lyocell tow despite the addition of the functional additive. [Means for solving the problem]

[0008] According to one embodiment of the present invention, a smoking article filter includes a lyocell tow containing a plurality of lyocell fibers, and a functional additive dispersed in the lyocell tow, wherein at least a portion of the plurality of lyocell fibers is not chemically modified by the functional additive.

[0009] In some embodiments, the functional additive may be added onto the lyocell fibers during the process of forming the lyocell tow, or may be added onto the lyocell tow during the process of forming the smoking article filter.

[0010] In some embodiments, the functional additive may include at least one phenolic reducing substance.

[0011] In some embodiments, the at least one phenolic-reducing substance comprises a first phenolic-reducing substance, and the lyocell tow having the functional additive dispersed therein is 13C Obtained by NMR analysis 13C The NMR spectrum exhibits a first peak located within a first peak range, and the first phenol-reducing substance is 13C Obtained by NMR analysis 13C The NMR spectrum may exhibit a second peak located within the first peak range.

[0012] In some embodiments, the first peak and the second peak may be the same.

[0013] In some embodiments, the lyocell tow 13C The NMR spectrum was obtained by dissolving the lyocell tow in an NMR solvent as a first solution. 13C This is obtained by NMR analysis.

[0014] In some embodiments, the functional additive is dispersed in the lyocell tow. 13C The NMR spectrum further exhibits a third peak located within a second peak range different from the first peak range, and the first phenol-reducing substance is 13C The above obtained by NMR analysis 13C The NMR spectrum may further exhibit a fourth peak located within said second peak range.

[0015] In some embodiments, the at least one phenolic-reducing substance further comprises a second phenolic-reducing substance, and the functional additive is dispersed in the lyocell tow. 13C The NMR spectrum further exhibits a third peak located within a second peak range different from the first peak range, and the second phenol-reducing substance is 13C Obtained by NMR analysis 13C The NMR spectrum can show a fourth peak located within the range of the second peak.

[0016] In some embodiments, the phenolic-reducing substance may include at least one of polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA).

[0017] In some embodiments, the functional additive may further include an oil agent.

[0018] According to one embodiment for solving the other problems, there is provided a smoking article including a smoking material portion, a filter portion, and a wrapper, wherein the filter portion includes lyocell tow including a plurality of lyocell fibers; and a functional additive dispersed in the lyocell tow, wherein at least a portion of the plurality of lyocell fibers is not chemically modified by the functional additive, and the functional additive includes a phenol-reducing substance, which includes at least one of polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA). [Effects of the Invention]

[0019] According to one embodiment of a smoking article filter and a smoking article including the same, a functional additive containing a phenol-reducing substance having phenol-reducing properties is dispersed in lyocell tow, but the lyocell fiber is not chemically modified by the functional additive, so that a smoking article filter and a smoking article including the same can be provided that can maintain the excellent biodegradability of the lyocell fiber.

[0020] In addition, according to one embodiment of a filter for smoking articles and a smoking article including the same, a functional additive containing a phenol-reducing substance having phenol-reducing properties is dispersed in lyocell tow, thereby providing a filter for smoking articles and a smoking article including the same that are highly biodegradable and have excellent phenol-reducing properties.

[0021] Furthermore, when a phenol-reducing substance is added to lyocell tow, it can be clearly confirmed using NMR analysis that the lyocell fiber is not chemically modified. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a smoking article according to one embodiment of the present invention. [Figure 2] FIG. 2 shows the NMR spectrum results of PEG 600 added to the lyocell tow produced in the examples according to one embodiment of the present invention. [Figure 3] FIG. 3 is a diagram showing the NMR spectrum results of TEC added to the lyocell tow produced in the examples according to one embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing the NMR spectrum results of TA added to the lyocell tow produced in the examples according to one embodiment of the present invention. [Figure 5] FIG. 5 shows the NMR spectrum results of the lyocell tow produced in the examples by adding PEG600, TEC, and TA according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The advantages and features of the present disclosure, as well as methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the technical idea of ​​the present disclosure is not limited to the following embodiments and can be embodied in various different forms. The following embodiments are merely provided to complete the technical idea of ​​the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art to which the present disclosure pertains. The technical idea of ​​the present disclosure is only defined by the scope of the claims.

[0024] When assigning reference numerals to components in each drawing, it should be noted that the same components are assigned the same numerals as much as possible even if they are displayed in different drawings. Furthermore, when describing the present disclosure, if it is determined that a detailed description of related known configurations or functions may obscure the gist of the present disclosure, the detailed description thereof will be omitted.

[0025] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in a manner commonly understood by those skilled in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not idealized or overly interpreted unless expressly defined otherwise. The terms used herein are intended to describe the embodiments and are not intended to limit the present disclosure. In this specification, the singular form includes the plural form unless otherwise specified in the text.

[0026] Furthermore, when describing components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are merely used to distinguish the component from other components, and do not limit the nature, procedure, or order of the components. When a component is described as being "coupled," "coupled," or "connected" to another component, it should be understood that the component may be directly coupled or connected to the other component, but that other components may also be "coupled," "coupled," or "connected" between the components.

[0027] As used in this disclosure, "comprises" and / or "comprising" means that a referenced component, step, operation and / or element does not exclude the presence or addition of one or more other components, steps, operations and / or elements.

[0028] First, some clarifications regarding terms used in this specification.

[0029] As used herein, "smoking article" may refer to any product that can be smoked or that can provide a smoking experience, whether based on tobacco, a tobacco derivative, expanded tobacco, reconstituted tobacco, or a tobacco substitute. For example, smoking articles may include smokable products such as cigarettes, cigars, and cigarillos.

[0030] As used herein, "smoking material" may refer to any type of substance that can be used in smoking articles.

[0031] As used herein, "upstream" or "upstream direction" may mean a direction away from the mouth of the smoker, and "downstream" or "downstream direction" may mean a direction toward the mouth of the smoker.

[0032] As used herein, "longitudinal direction" may mean the direction corresponding to the longitudinal axis of the smoking article.

[0033] Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0034] Figure 1 is a diagram showing a schematic configuration of a smoking article according to one embodiment of the present invention. Figure 2 is a diagram showing the NMR spectrum of PEG600 added to the lyocell tow produced in the examples according to one embodiment of the present invention. Figure 3 is a diagram showing the NMR spectrum of TEC added to the lyocell tow produced in the examples according to one embodiment of the present invention. Figure 4 is a diagram showing the NMR spectrum of TA added to the lyocell tow produced in the examples according to one embodiment of the present invention. Figure 5 is a diagram showing the NMR spectrum of the lyocell tow produced in the examples by adding PEG600, TEC, and TA according to one embodiment of the present invention.

[0035] Throughout the specification, "smoking article" may refer to an article capable of generating an aerosol, such as a cigarette, a cigar, etc. Smoking articles may include an aerosol-generating substance or an aerosol-forming substrate. Smoking articles may also include solid substances based on tobacco, such as flat tobacco, shredded tobacco, or reconstituted tobacco. Smoking substances may include volatile compounds.

[0036] Additionally, throughout the specification, "upstream" or "upstream direction" refers to a direction away from the mouth of a user smoking the smoking article 1, and "downstream" or "downstream direction" refers to a direction toward the mouth of a user smoking the smoking article 1. For example, in the smoking article 1 shown in Figure 1, the smoking material portion 10 is located upstream or in the upstream direction of the smoking article filter portion 20 (or smoking article filter, filter portion).

[0037] Furthermore, although the present specification has given an example in which the smoking article 1 is a combustible cigarette, the smoking article 1 is not limited to this, and may also be a heated cigarette used in conjunction with an aerosol generating device (not shown), such as an electronic cigarette device.

[0038] The present invention relates to a smoking article filter 20 (or a smoking article filter portion) included in a smoking article 1, and the smoking article filter 20 according to one embodiment of the present invention includes a lyocell tow containing a plurality of lyocell fibers and a functional additive dispersed in the lyocell tow, and at least a portion of the plurality of lyocell fibers may not be chemically modified by the functional additive.

[0039] As used herein, the term "not chemically modified" may mean that even though a functional additive is added to lyocell tow, the multiple lyocell fibers constituting the lyocell tow are not chemically synthesized with, chemically bonded to, or compositionally modified with the functional additive, so that the chemical properties and characteristics of the lyocell fiber are not changed. In other words, it may mean that the chemical properties and characteristics of the lyocell fiber contained in the lyocell tow to which the functional additive has been added are the same as those of the lyocell fiber contained in the lyocell tow to which the functional additive has not been added.

[0040] The lyocell tow contained in the smoking article filter 20 according to the present invention is composed of a plurality of lyocell fibers, which are regenerated cellulose, a natural polymer that is not chemically modified, despite the addition of functional additives. This maintains the properties of lyocell fibers, which are characterized by their excellent biodegradability, and the smoking article filter containing this lyocell tow also has excellent biodegradability.

[0041] In some embodiments, the functional additive may be added to the lyocell fiber during the process of forming the lyocell tow, or may be added to the lyocell tow during the process of forming a smoking article filter using the lyocell tow. When the functional additive is added to the lyocell fiber during the process of forming the lyocell tow, the functional additive may be added by directly spraying it onto the surface of the lyocell fiber using a spray type. When the functional additive is added to the lyocell tow during the process of forming a smoking article filter, the functional additive may be added by indirectly spraying it using a brush type.

[0042] In some embodiments, the functional additive may include a phenol-related functional substance. Without being limited thereto, the functional additive may further include an oil agent.

[0043] In some embodiments, the functional additive may include a phenol-related functional substance, and the phenol-related functional substance may be a phenol-reducing substance. The "phenol" may refer to a group of chemical compounds composed of a hydroxyl group (-OH) directly bonded to an aromatic hydrocarbon functional group, and the phenol group includes phenol, catechol, m+P cresol, and o-cresol. The "phenol-reducing substance" may correspond to a substance that can specifically reduce at least one of phenolic substances in smoke generated during smoking, such as phenol, catechol, m+P cresol, and o-cresol.

[0044] In some embodiments, the phenolic-reducing substance may include at least one of polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA).

[0045] According to one embodiment, the lyocell tow in which the functional additive containing the phenol-related functional material is dispersed is 13 C NMR spectroscopy (hereinafter referred to as 13 C NMR analysis) 13 Analysis of the C NMR spectrum of the lyocell tow according to one embodiment reveals 13 The C NMR spectrum can exhibit a first peak located within the first peak range. 13 C NMR analysis was performed on the first solution in which lyocell tow containing dispersed functional additives including phenol-related functional substances was dissolved in an NMR solvent. 13 C NMR analysis can be performed to obtain and analyze a spectrum. The NMR solvent may include, but is not limited to, CDCl3, and the NMR solvent is not limited as long as it is a solvent that can be used for NMR analysis.

[0046] In one embodiment, the phenol-related functional substance contained in the functional additive is13 C NMR analysis 13 Analysis of the C NMR spectrum reveals that the functional compounds related to phenols 13 The C NMR spectrum can exhibit a second peak located within the first peak range. In some embodiments, the first peak and the second peak can be the same.

[0047] In an exemplary embodiment, the phenol-related functional material 13 C NMR analysis was performed on a second solution in which phenol-related functional substances were dissolved in an NMR solvent. 13 C NMR analysis can be performed to obtain and analyze spectra, and the NMR solvent may include CDCl3.

[0048] As mentioned above, phenol-related functional substances 13 The second peak that appears in the C NMR spectrum is the peak of the lyocell tow in which the functional additive containing the phenol-related functional substance is dispersed. 13 The first peak and the second peak may be located within the range of the first peak appearing in the C NMR spectrum, and the first peak and the second peak may be the same. 13 The peaks appearing in the C NMR spectrum remained the same before and after the phenol-related functional substance was added to the lyocell tow, confirming that the phenol-related functional substance was not chemically modified despite being added to the lyocell tow. In other words, since the phenol-related functional substance added to the lyocell tow was not chemically modified, it was indirectly or directly confirmed that at least some of the lyocell fibers constituting the lyocell tow were not chemically modified by the phenol-related functional substance.

[0049] In some embodiments, the phenol-related functional substance contained in the functional additive may include a plurality of phenol-reducing substances. When the functional additive dispersed in the lyocell tow contains a plurality of phenol-reducing substances, the functional additive containing the plurality of phenol-reducing substances is dispersed in the lyocell tow.13 The C NMR spectra of the various phenolic compounds were 13 A C NMR spectrum can show multiple peaks located within the range of peaks contained therein.

[0050] For example, when the phenol-related functional substance contained in the functional additive contains one phenol-reducing substance, that is, when the phenol-related functional substance contained in the functional additive contains a first phenol-reducing substance, the functional additive is dispersed in lyocell tow. 13 The C NMR spectrum of the first phenol-reducing substance 13 The peak ranges included in the C NMR spectrum can be indicated.

[0051] In yet another example, when the phenol-related functional substance contained in the functional additive contains a plurality of phenol-reducing substances, for example, when the phenol-related functional substance contained in the functional additive contains a first phenol-reducing substance and a second phenol-reducing substance that are different from each other, the functional additive containing the first and second phenol-reducing substances can be dispersed in a lyocell tow. 13 The C NMR spectrum of the first phenol-reducing substance 13 The first peak range and the second phenol-reducing substance appearing in the C NMR spectrum 13 The full range of secondary peaks that appear in the C NMR spectrum can be shown.

[0052] Similarly, when the phenol-related functional substance contained in the functional additive includes a first phenol-reducing substance, a second phenol-reducing substance, and a third phenol-reducing substance that are different from each other, the functional additive containing the first to third phenol-reducing substances is dispersed in lyocell tow. 13 The C NMR spectrum of the first phenol-reducing substance 13 The first peak range that appears in the C NMR spectrum, the second peak range of the phenol-reducing substance 13 The second peak range that appears in the C NMR spectrum, the third phenol-reducing substance 13The full range of third peaks that appear in the C NMR spectrum can be shown.

[0053] In some embodiments, the phenol-reducing substance included in the functional additive may include polyethylene glycol (PEG) having a molecular weight of 600, or PEG 600. 13 The C NMR spectrum can exhibit peaks located within the a-th peak range (peak a) between 3.5 ppm and 4.0 ppm, between 3.6 ppm and 3.8 ppm, between 3.65 ppm and 3.78 ppm, between 3.62 ppm and 3.75 ppm, or between 3.65 ppm and 3.66 ppm.

[0054] In some embodiments, the phenol-reducing substance included in the functional additive may include triethyl citrate (TEC). 13 The C NMR spectrum may show peaks located within a peak b range (peak b) of 4.0 ppm to 5.0 ppm, 4.05 ppm to 4.5 ppm, 4.1 ppm to 4.35 ppm, or 4.15 ppm to 4.33 ppm, and peaks located within a peak c range (peak c) of 2.5 ppm to 3.0 ppm, 2.4 ppm to 3.0 ppm, 2.7 ppm to 2.95 ppm, or 2.79 ppm to 2.93 ppm.

[0055] In some embodiments, the phenol-reducing substance included in the functional additive may include triacetin (TA). 13The C NMR spectrum may show peaks located within a d-th peak range (peak d) of 5.0 ppm to 5.5 ppm, 5.1 ppm to 5.4 ppm, 5.2 ppm to 5.3 ppm, 5.22 ppm to 5.28 ppm, or 2.24 ppm to 5.26 ppm, a peak within a e-th peak range (peak e) of 4.0 ppm to 5.0 ppm, 4.05 ppm to 4.5 ppm, 4.1 ppm to 4.35 ppm, 4.12 ppm to 4.33 ppm, or 4.14 ppm to 4.31 ppm, and a peak within a f-th peak range (peak f) of 2.0 ppm to 2.5 ppm, 2.03 ppm to 2.2 ppm, 2.04 ppm to 2.15 ppm, 2.05 ppm to 2.13 ppm, or 2.07 ppm to 2.10 ppm.

[0056] This includes, but is not limited to, TA 13 The e-th peak range (peak e) in the C NMR spectrum is 13 It may be included in the b-th peak range (peak b) included in the C NMR spectrum.

[0057] In some embodiments, a functional additive containing PEG 600 as a phenolic reducing agent is dispersed in lyocell tow. 13 The C NMR spectrum can exhibit at least a range of peaks.

[0058] In some other embodiments, a functional additive comprising TEC as a phenolic reducing agent is dispersed in lyocell tow. 13 The C NMR spectrum can exhibit at least the bth and cth peak ranges.

[0059] In still other embodiments, a lyocell tow having a functional additive dispersed therein, the functional additive comprising TA as a phenolic compound reducing substance, 13 The C NMR spectrum can exhibit at least the d-th, e-th, and f-th peak ranges.

[0060] In still other embodiments, a lyocell tow having dispersed therein a functional additive comprising PEG600, TEC, and TA as a phenolic reducing substance is provided. 13 A C NMR spectrum can exhibit the a-th peak range, the b-th peak range (or the e-th peak range), the c-th peak range, the d-th peak range, and the f-th peak range.

[0061] The following is a description of the phenol-reducing substance and the lyocell tow in which the phenol-reducing substance is dispersed. 13 C NMR analysis is performed to demonstrate that the phenolic reducing substances contained in the functional additives do not cause any chemical changes in the lyocell fibers.

[0062] <Experimental Example> 13 C NMR analysis

[0063] To analyze whether functional additives cause chemical changes in Lyocell fibers, PEG600, TEC, and TA, which can be included in functional additives as phenol-reducing substances, were used. 13 C NMR analysis was performed on each of the Lyocell tows, which contained dispersed functional additives including PEG600, TEC, and TA, and multiple Lyocell fibers. 13 C NMR analysis was performed.

[0064] Specifically, using CDCl3 as the NMR solvent, 2.1 mg of PEG600 was added to 0.75 mL of CDCl3, and then the NMR solution to which PEG600 had been added was 13 C NMR analysis (JEOL ECX 500) was performed, and the results are shown in Figure 2. 13 C NMR spectrum.

[0065] In addition, CDCl3 was used as the NMR solvent, and 2.5 mg of TEC was added to 0.75 mL of CDCl3. 13 C NMR analysis (JEOL ECX 500) was performed, and the results are shown in Figure 3. 13 C NMR spectrum.

[0066] In addition, CDCl3 was used as the NMR solvent, and 2.5 mg of TA was added to 0.75 mL of CDCl3. 13 C NMR analysis (JEOL ECX 500) was performed, and the results are shown in Figure 4. 13 C NMR spectrum.

[0067] In addition, a smoking article filter satisfying the requirements of a drawing resistance of 405 mmWG, a length of 108 mm, and a circumference of 24.2 mm was manufactured using lyocell tow to which 20 μL of functional additives containing 2.1 mg of PEG600, 2.5 mg of TEC, and 2.5 mg of TA had been added. 100 mg of the lyocell tow portion in which the functional additives had been dispersed was extracted from the manufactured smoking article filter, and the extracted lyocell tow was dissolved in 0.75 mL of CDCl3 using CDCl3 as an NMR solvent for 10 hours. The NMR solution was then analyzed. 13 C NMR analysis (JEOL ECX 500) was performed, and the results are shown in Figure 5. 13 C NMR spectrum.

[0068] 2 to 5, the experimental results show that the phenol-reducing substances (PEG600, TEC, and TA) not added to lyocell tow 13 The peak ranges appearing in the C NMR spectrum (see Figures 2 to 4) are the a-peak range, the b-peak range (or the e-peak range), the c-peak range, the d-peak range, and the f-peak range of the lyocell tow to which the phenol-reducing substance has been added. 13 It can be confirmed that all of these appear in the C NMR spectrum (see Figure 5). As a result, it can be confirmed that PEG600, TEC, and TA do not undergo chemical reactions such as substitution or bonding with the lyocell fiber, and there is no chemical change. Therefore, since PEG600, TEC, and TA dispersed in the lyocell tow did not undergo chemical changes, it can be confirmed that the lyocell fiber also did not undergo chemical changes.

[0069] The above-described cigarette filter can be applied to a smoking article. Fig. 1 is a diagram showing a schematic configuration of a smoking article according to one embodiment of the present invention. The smoking article 100 includes a smoking material portion 10 and a filter portion 20, and the above-described smoking article filter is applied to the filter portion 20 of the smoking article 100. In the smoking article 100, the smoking material portion 10 is located upstream of the filter portion 20.

[0070] The smoking material portion 10 may be filled with smoking material such as raw tobacco, flake tobacco, or a mixture of leaf tobacco and flake tobacco. Processed smoking material may be filled into the smoking material portion 10 in sheet or shredded form. The smoking material portion 10 may have an elongated rod shape, and its length, circumference, and diameter may be adjusted to sizes commonly used in the art, taking into consideration the amount of smoking material to be filled, user preferences, etc., without particular limitations. The smoking material portion 10 may contain at least one aerosol-generating material selected from the group consisting of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. The smoking material portion 10 may contain other additives, such as flavorants, humectants, and / or acetate compounds. The aerosol-generating material and additives may be contained in the smoking material.

[0071] The filter unit 20 is disposed downstream of the smoking material unit 10 and serves as a filter through which the aerosol generated in the smoking material unit 10 passes just before the user inhales. The filter unit 20 can be manufactured using various materials and shapes. According to one embodiment of the present invention, the filter unit 20 essentially comprises a smoking article filter, as described above, containing lyocell tow, which includes a plurality of lyocell fibers, and triethyl citrate (TEC) dispersed on the lyocell tow. The smoking article filter containing lyocell tow and triethyl citrate (TEC) can replace the entire or partial filter unit 20 of a conventional smoking article. When partially replacing the filter unit 20, conventional filter materials can be used. Examples of conventional filter materials that can be used include cellulose acetate filters, paper filters, and hollow tube filters.

[0072] 1 shows that the filter unit 20 is a mono-filter consisting of a single filter, but is not limited thereto. For example, the filter unit 20 may be a dual filter or triple filter having two or more acetate filters to increase filtering efficiency.

[0073] In some embodiments, when the filter unit 20 is a dual filter or triple filter, one of the filters may be a filter containing lyocell tow containing the lyocell fiber of the present invention and triethyl citrate (TEC) dispersed in the lyocell tow (hereinafter referred to as a lyocell filter), and the other filters may be a cellulose acetate filter and / or a paper filter. In this case, the length of the lyocell filter of the present invention may be 25% to 50% of the total length of the filter unit 20.

[0074] Although not shown, the smoking article 100 may further include a hollow tube structure, which is a tube-shaped structure having a hollow interior. The hollow tube structure may be disposed downstream of the filter section 20 including the lyocell filter.

[0075] In some embodiments, the hollow tubular structure may have perforations, but is not limited thereto. The hollow tubular structure may not have perforations. In some embodiments, when perforations are formed in the hollow tubular structure, the perforations may be formed at a position 10 mm to 15 mm upstream from the downstream end of the smoking article 100.

[0076] The exterior of the smoking material portion 10 and the filter portion 20 may be wrapped in a wrapper 30a or 30b.

[0077] The smoking material portion 10 can be wrapped in a smoking material wrapper 30a. A portion of the tobacco smoke generated during the combustion process of a typical smoking material portion 10 is released into the atmosphere through the smoking material wrapper 30a before passing through the filter portion 20, resulting in sidestream smoke that is unpleasant for secondhand smokers. Various attempts to reduce sidestream smoke have been made, such as incorporating fillers such as magnesium oxide, titanium oxide, cerium oxide, aluminum oxide, calcium carbonate, and zirconium carbonate into cigarette paper. However, simply applying these fillers to reduce sidestream smoke can result in a poor smoking experience, poor burn-off, and poor ash solidification, making it difficult to resolve these issues through an appropriate combination of fillers. In some embodiments, the smoking material wrapper 30a can incorporate a filler containing a mixture of magnesium oxide (MgO and / or Mg(OH)2) and calcium carbonate (CaCO3) to reduce sidestream smoke while simultaneously preventing poor smoking experience, poor ash solidification, and poor burn-off.

[0078] The filter part 20 can be wrapped in a filter part wrapper 30b. The filter part wrapper 30b can be made of oil-resistant wrapping paper, and the inner surface of the filter part wrapper 30b can further include aluminum foil. As described above, the filter part wrapper 30b is 90 mg. -2 It may have the following basis weights, but is not limited to these:

[0079] The smoking material section 10 wrapped in the smoking material section wrapper 30a and the filter section 20 wrapped in the filter section wrapper 30b can be bonded and wrapped with tipping paper 40. As shown in FIG. 1, the tipping paper 40 may be wrapped around at least a portion (e.g., a downstream portion) of the smoking material section wrapper 30a and the filter section wrapper 30b. In other words, at least a portion of the smoking material section 10 and the filter section 20 may be further wrapped and physically bonded with the tipping paper 40. According to one embodiment of the present invention, the tipping paper 40 may be made of, but is not limited to, non-porous wrapping paper that has not been treated for oil resistance. The tipping paper 40 may also contain, but is not limited to, a non-flammable material to prevent the filter section 20 from burning.

[0080] Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present disclosure can be embodied in other specific forms without changing the technical concept or essential features thereof. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and are not limiting. The scope of protection of the present disclosure should be interpreted by the following claims, and all technical concepts within the scope equivalent thereto should be understood to be included in the scope of rights of the technical concepts defined by the present disclosure.

Claims

1. a lyocell tow comprising a plurality of lyocell fibers; a functional additive dispersed in the lyocell tow; A filter for a smoking article, wherein at least a portion of the plurality of lyocell fibers is not chemically modified with the functional additive.

2. The functional additive is The smoking article filter according to claim 1 , wherein the additive is added onto the lyocell fibers in a process of forming the lyocell tow, or added onto the lyocell tow in a process of forming the smoking article filter.

3. The smoking article filter according to claim 1 , wherein the functional additive comprises at least one phenol-reducing substance.

4. the at least one phenolic-reducing substance comprises a first phenolic-reducing substance; The lyocell tow in which the functional additive is dispersed １３ C NMR analysis １３ The C NMR spectrum shows a first peak located within the first peak range, The first phenol-reducing substance １３ C NMR analysis １３ 4. The smoking article filter of claim 3, wherein the C NMR spectrum exhibits a second peak located within the first peak range.

5. The filter for a smoking article according to claim 4 , wherein the first peak and the second peak are the same.

6. The lyocell tow １３ The C NMR spectrum was obtained by dissolving the lyocell tow in an NMR solvent and dissolving the functional additive therein in a first solution. １３ The smoking article filter according to claim 4, obtained by C NMR analysis.

7. The functional additive is dispersed in the lyocell tow. １３ the C NMR spectrum further exhibits a third peak located within a second peak range distinct from the first peak range; The first phenol-reducing substance １３ The above obtained by C NMR analysis １３ 5. The filter for a smoking article according to claim 4, wherein the C NMR spectrum further exhibits a fourth peak located within the second peak range.

8. the at least one phenolics-reducing substance further comprises a second phenolics-reducing substance; The functional additive is dispersed in the lyocell tow. １３ the C NMR spectrum further exhibits a third peak located within a second peak range distinct from the first peak range; The second phenol-reducing substance １３ C NMR analysis １３ 5. The smoking article filter of claim 4, wherein the C NMR spectrum exhibits a fourth peak located within the second peak range.

9. 4. The filter for a smoking article according to claim 3, wherein the phenol-reducing substance includes at least one of polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA).

10. The smoking article filter according to claim 3 , wherein the functional additive further comprises an oil.

11. 1. A smoking article comprising a smoking material portion, a filter portion, and a wrapper, The filter section is a lyocell tow comprising a plurality of lyocell fibers; a functional additive dispersed in the lyocell tow; At least a portion of the plurality of lyocell fibers are not chemically modified by the functional additive; The functional additive includes a phenol-reducing substance, The smoking article, wherein the phenol-reducing substance includes at least one of polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA).

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