Filter for smoking article comprising lyocell tow and smoking article comprising same

Abstract

A filter tip for a smoking article and a smoking article are provided. A filter for a smoking article comprises: a lyocell tow comprising lyocell fibers and a phenol-based reducing substance dispersed in the lyocell tow; the phenol-based reducing substance includes a phenol-based reducing substance, a phenol-based reducing substance, and a phenol-based reducing substance, wherein the phenol-based reducing substance includes triethyl citrate; tEC), and the content of the triethyl citrate per 1 mm length of the lyocell tow is 0.11 mg to 1.85 mg.

Description

Technical Field

[0001] The present invention relates to a filter tip for smoking articles, in which triethylcitrate (TEC) is added to lyocell tow as a phenol-reducing substance, and a smoking article comprising the filter tip. Background Art

[0002] Cigarette filters typically include cellulose acetate tow (tow), which is acetylated cellulose extracted from wood pulp. Furthermore, cigarette filters are assembled into smoking articles, distributed to consumers for smoking, and ultimately discarded after smoking the cigarettes. Furthermore, some cigarette filters may be directly discarded as manufacturing residues by cigarette filter manufacturers. These cigarette filter wastes are recycled as waste and disposed of in landfills. Furthermore, in some cases, cigarette butts after smoking are not recycled as waste, but are abandoned in the natural environment.

[0003] Therefore, in recent years, in order to protect the natural environment and reduce costs, research has been conducted to replace cellulose acetate tow with environmentally friendly materials. For example, tow using lyocell fibers (i.e., lyocell tow) obtained by fibrillating cellulose itself, unlike cellulose acetate, has been developed.

[0004] When manufacturing filters for smoking articles, phenolic smoke components in mainstream smoke are reduced by adding a phenol-reducing substance that specifically reduces phenols produced during smoking. Conventionally, phenol-reducing substances such as polyethylene glycol (PEG), triethyl citrate (TEC), and triacetin (TA) are known to be added to cellulose acetate tow. When phenol-reducing substances composed of polyethylene glycol (PEG) and triethyl citrate (TEC) are added to hydrophobic cellulose acetate, they also act as plasticizers on the cellulose acetate fibers, causing them to bind together and reducing biodegradability.

[0005] On the other hand, when phenol-reducing substances such as polyethylene glycol (PEG) and triethyl citrate (TEC) are added to lyocell fibers, the hydrophilic lyocell fibers are not plasticized. Therefore, it was found that when phenol-reducing substances such as polyethylene glycol (PEG) and triethyl citrate (TEC) are added to lyocell fibers, the biodegradability is not reduced and the phenol smoke component in mainstream smoke is reduced.

[0006] On the other hand, when adding phenol-reducing substances to lyocell fibers to reduce the phenol smoke component in mainstream smoke, the phenol-reducing substances need to be optimized to have the best phenol-reducing performance while maintaining the physical properties of the filter used in smoking articles. Summary of the Invention

[0007] Technical issues

[0008] The problem to be solved by the present invention is to provide a filter tip for smoking articles. The filter tip for smoking articles is formed by adding triethyl citrate (TEC) designed to an optimal content to lyocell tow, thereby more effectively removing components such as phenols present in cigarette smoke generated during the smoking process and having excellent biodegradability.

[0009] Another problem to be solved by the present invention is to provide a smoking article, which includes a filter tip for the smoking article. The filter tip for the smoking article is constructed by adding triethyl citrate (TEC) designed to an optimal content to lyocell tow, thereby more effectively removing components such as phenols present in cigarette smoke generated during the smoking process and having excellent biodegradability.

[0010] Solutions to the Problem

[0011] According to one embodiment, a filter for a smoking article for solving the above-mentioned problem includes: a lyocell tow comprising lyocell fibers, and a phenol-reducing substance dispersed in the above-mentioned lyocell tow; the above-mentioned phenol-reducing substance includes triethyl citrate (TEC), and the content of the above-mentioned triethyl citrate per 1 mm length of the above-mentioned lyocell tow is 0.11 mg to 1.85 mg.

[0012] In some embodiments, the content of the triethyl citrate per 1 mm length of the lyocell tow may be 0.18 mg to 1.2 mg.

[0013] In some embodiments, the content of the triethyl citrate per 1 mm length of the lyocell tow may be 0.5 mg to 0.95 mg.

[0014] In some embodiments, the content of the triethyl citrate per 1 mm length of the lyocell tow may be 0.6 mg to 0.85 mg.

[0015] In some embodiments, the hardness of the filter for smoking articles may be 70% to 95%.

[0016] In some embodiments, the lyocell fiber may have a special-shaped cross-section.

[0017] According to one embodiment, a smoking article for solving the other problem mentioned above includes: a smoking material portion, a filter portion located downstream of the above-mentioned smoking material portion, and a wrapping paper surrounding the above-mentioned smoking material portion or the above-mentioned filter portion; the above-mentioned filter portion includes: a lyocell tow containing lyocell fibers, and a phenol-reducing substance dispersed in the above-mentioned lyocell tow; the above-mentioned phenol-reducing substance includes triethyl citrate (TEC), and the content of the above-mentioned triethyl citrate per 1 mm length of the above-mentioned lyocell tow is 0.11 mg to 1.85 mg.

[0018] In some embodiments, the content of the triethyl citrate per 1 mm length of the lyocell tow may be 0.6 mg to 0.85 mg.

[0019] In some embodiments, the lyocell fiber may have a special-shaped cross-section.

[0020] In some embodiments, the filter portion may further include a capsule capable of generating flavor.

[0021] Effects of the Invention

[0022] According to one embodiment, a filter for a smoking article and a smoking article including the same can provide a lyocell filter using lyocell tow to which triethyl citrate (TEC) is added as a phenol-reducing substance, thereby effectively removing phenols and other components present in the smoke generated during smoking.

[0023] In addition, even if triethyl citrate (TEC) is added to lyocell tow, triethyl citrate (TEC) does not act as a plasticizer for the hydrophilic lyocell tow, so it is possible to provide a filter for smoking articles that has excellent biodegradability while having phenol reduction performance and a smoking article including the same.

[0024] In addition, by designing the optimal content of triethyl citrate (TEC) added to lyocell tow, components such as phenols present in the smoke produced during smoking can be more effectively removed.

[0025] The effects of the technical idea of the present disclosure are not limited to the effects described above, and those skilled in the art can clearly understand other effects not mentioned through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a diagram showing a schematic structure of a smoking article according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] 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 and methods for achieving them can be clarified through the accompanying drawings and the embodiments described in detail below. However, the technical ideas of the present disclosure are not limited to the embodiments described below, and can be implemented in various different forms. The following embodiments are only used to fully disclose the present disclosure so that people with general knowledge in the technical field to which the present disclosure belongs can fully understand the scope of the present disclosure. The technical ideas of the present disclosure are determined by the scope of the claims of the present disclosure.

[0028] When adding reference numerals to components throughout the drawings, it should be noted that the same reference numerals denote the same components even when they are shown in different drawings. Furthermore, when describing the present disclosure, detailed descriptions of the configurations or functions of related known technologies may be omitted if they are deemed to obscure the gist of the present disclosure.

[0029] Unless otherwise specified, all terms (including technical and scientific terms) used in this specification can be used as meanings that can be commonly understood by persons with general knowledge in the technical field to which this disclosure belongs. In addition, commonly used terms with definitions in dictionaries will not be abnormally or over-interpreted unless they are clearly defined. The terms used in this specification are for the purpose of illustrating the embodiments only and are not intended to limit the present disclosure. In this specification, unless otherwise specified, nouns in the form of a single number also include the form of a plurality of numbers.

[0030] In addition, when describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only used to distinguish one component from another component, and the nature, order or sequence of the related components are not limited by the terms. It should be understood that if a component is described as being "connected," "coupled," or "linked" to another component, it may mean that the component is not only directly "connected," "coupled," or "linked" to the other component, but also indirectly "connected," "coupled," or "linked" via a third component.

[0031] The terms “comprises” and / or “comprising” used in the present disclosure specify the presence of stated components, steps, operations and / or elements, but do not preclude the presence or addition of one or more other components, steps, operations and / or elements.

[0032] First, some terms used in this specification will be clarified.

[0033] In this specification, "smoking article" may refer to any product that can be smoked or any product that can provide a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, smoking articles may include smokable articles such as cigarettes, cigars, and cigarillos.

[0034] In this specification, "smoking material" may refer to any type of substance that can be used in a smoking article.

[0035] In this specification, “upstream” or “upstream direction” may refer to a direction away from a smoker's mouth, and “downstream” or “downstream direction” may refer to a direction toward a smoker's mouth.

[0036] In this specification, "longitudinal direction" may refer to the direction corresponding to the longitudinal axis of the smoking article.

[0037] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0038] Figure 1 This is a diagram showing a schematic structure of a smoking article according to an embodiment of the present invention.

[0039] Throughout this specification, "smoking article" may refer to an article capable of generating an aerosol, such as a cigarette (cigarette), a cigar, etc. The smoking article may contain an aerosol-generating substance or an aerosol-forming substrate. In addition, the smoking article may include a solid material based on tobacco raw materials, such as reconstituted tobacco, pipe tobacco, reconstituted tobacco, etc. The smoking substance may include volatile compounds.

[0040] Furthermore, throughout the specification, “upstream” or “upstream direction” may refer to a direction away from the mouth of a user who smokes the smoking article 100, and “downstream” or “downstream direction” may refer to a direction toward the mouth of a user who smokes the smoking article 100. Figure 1 In the smoking article 100 shown, the smoking material portion 10 is located upstream or in an upstream direction of the filter portion 20 (or filter, filter portion) for the smoking article.

[0041] Furthermore, although the smoking article 100 is described in this specification as a combustion cigarette, the present invention is not limited thereto. The smoking article 100 may also be a heated cigarette used in conjunction with an aerosol generating device (not shown) such as an electronic cigarette device.

[0042] The present invention relates to a filter tip 20 (or a filter tip portion, a filter tip portion) for a smoking article filter included in a smoking article 1. According to one embodiment of the present invention, the filter tip 20 for a smoking article includes: a lyocell tow comprising lyocell fibers, and a phenol-reducing substance added to the lyocell tow; the phenol-reducing substance includes triethyl citrate (TEC).

[0043] The aforementioned "phenol" may refer to a group of compounds consisting 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 aforementioned "phenol-reducing substance" may correspond to a substance that can specifically reduce phenols in smoke generated during smoking, such as at least one of phenol, catechol, m-p-cresol, and o-cresol.

[0044] The lyocell fiber is an environmentally friendly fiber made from cellulose extracted from wood pulp. The lyocell tow is a bundle formed by cross-linking adjacent lyocell fibers.

[0045] In some embodiments, the lyocell fiber may have a profiled cross-section. A profiled cross-section is defined as a cross-section that is not circular but includes a plurality of protrusions. For example, a cross-section having a plurality of protrusions extending from a center may be referred to as a profiled cross-section.

[0046] In some embodiments, the lyocell fiber may have a Y-shaped cross-section including three protrusions branching from the center, a cross-shaped cross-section including four protrusions, a star-shaped cross-section including five or more protrusions, or an O-shaped cross-section, but the present invention is not limited thereto.

[0047] In some embodiments, the phenol-reducing substance can be uniformly dispersed in the lyocell tow and distributed throughout the entire area of the lyocell tow constituting the filter for the smoking article.The phenol-reducing substance including triethyl citrate (TEC) can be coated on the surface of the lyocell fibers constituting the lyocell tow.

[0048] The phenol-reducing substance comprising triethyl citrate (TEC) can be dispersed on the lyocell tow in any manner. In certain embodiments, the phenol-reducing substance comprising triethyl citrate (TEC) can be applied to the lyocell tow and dispersed on the lyocell tow by a spray type, for example, by a transfer jet nozzle system (TJNS). However, the present invention is not limited thereto, and the phenol-reducing substance comprising triethyl citrate (TEC) can be dispersed on the lyocell tow by a brush type. Therefore, a filter for a smoking article comprising a lyocell tow dispersed with a phenol-reducing substance comprising triethyl citrate (TEC) can be prepared without adding or modifying a separate manufacturing device.

[0049] In other filters for smoking articles according to the present invention, even if a phenol-reducing substance including triethyl citrate (TEC) is applied to the surface of lyocell fibers, the triethyl citrate (TEC) may not act as a plasticizer between the lyocell fibers. Therefore, even if triethyl citrate (TEC) is added to the lyocell tow as a phenol-reducing substance, the multiple lyocell fibers included in the filter for smoking articles will not be substantially connected to each other, and the biodegradability of the filter for smoking articles may not be reduced. In other words, the filter for smoking articles according to the present invention may not include an additive for bonding the lyocell fibers together.

[0050] When a filter for a smoking article to which the lyocell tow according to the present invention is applied includes a phenol-reducing substance including triethyl citrate (TEC) dispersed on the lyocell tow, the effect of reducing phenols that occurs during smoking can be excellent compared to a filter for a smoking article to which no triethyl citrate (TEC) is added.

[0051] In some embodiments, the content of triethyl citrate (TEC) dispersed on the lyocell tow can be 3 mg / rod to 50 mg / rod, 4 mg / rod to 40 mg / rod, 5 mg / rod to 30 mg / rod, 8 mg / rod to 29 mg / rod, 10 mg / rod to 28 mg / rod, 12 mg / rod to 27 mg / rod, or 15 mg / rod to 25 mg / rod, preferably, 18 mg / rod to 22 mg / rod. The above range of triethyl citrate (TEC) content is suitable for the above-mentioned lyocell filter having a diameter of 7.71 mm, a circumference of 24.20 mm, and a length of 27 mm. When triethyl citrate (TEC) is dispersed and contained in the above-mentioned lyocell tow in the above-mentioned range, the physical properties of the filter for smoking articles can be maintained and excellent phenol reduction performance can be achieved.

[0052] In some embodiments, the content of triethyl citrate (TEC) dispersed on the Lyocell tow per 1 mm length can be 0.11 mg to 1.85 mg, 0.18 mg to 1.2 mg, or 0.5 mg to 0.95 mg, preferably 0.6 mg to 0.85 mg. When triethyl citrate (TEC) is dispersed and contained in the Lyocell tow within the above ranges, the physical properties of the filter used in the smoking article can be maintained while having excellent phenol reduction performance.

[0053] In some embodiments, the added amount of triethyl citrate (TEC) dispersed on the lyocell tow may be 0.1 wt % to 15 wt % relative to the weight of the lyocell tow.

[0054] In some embodiments, the mono denier of the lyocell fiber constituting the lyocell tow may satisfy the range of 2 to 6, 2.3 to 5, 2.5 to 4.5, 2.7 to 4, 3 to 3.5, or 3.1 to 3.4.

[0055] In some embodiments, the total denier of the lyocell fibers constituting the lyocell tow may satisfy the range of 15,000 to 50,000, 25,000 to 48,000, 30,000 to 45,000, or 35,000 to 40,000.

[0056] In some embodiments, the draw resistance of a filter for a smoking article comprising a lyocell tow in which a phenol-reducing substance including triethyl citrate (TEC) is dispersed may be in the range of 50 mm WG / 27 mm to 150 mm WG / 27 mm, 60 mm WG / 27 mm to 140 mm WG / 27 mm, 70 mm WG / 27 mm to 130 mm WG / 27 mm, 80 mm WG / 27 mm to 120 mm WG / 27 mm, or may be 100 mm WG / 27. Although the present invention is not limited thereto, the weight of the lyocell tow contained in the filter for a smoking article having a draw resistance within the above numerical ranges may be 700 mg / 108 mm.

[0057] In some embodiments, the hardness of a filter for a smoking article comprising a lyocell tow in which a phenol-reducing substance including triethyl citrate (TEC) is dispersed can be 60% to 98%, 65% to 97%, or 70% to 95%. The hardness of the filter for a smoking article is a numerical value of the degree to which the diameter of the filter for a smoking article is maintained when the filter for a smoking article is pressed with a certain level of force in a direction perpendicular to the longitudinal direction of the filter for a smoking article. It can be a percentage value of the ratio between the diameter of the filter for a smoking article after the force is applied and the diameter of the filter for a smoking article before the force is applied. Specifically, the hardness of the filter for a smoking article is measured using the following mathematical formula 1.

[0058] [Mathematical formula 1]

[0059] Hardness of the filter for smoking articles (%) = a / D*100

[0060] (D is the diameter of the filter for the smoking article, and a represents the diameter of the filter for the smoking article after the filter for the smoking article is pressed with a hammer for a predetermined time.)

[0061] A filter for a smoking article according to an embodiment of the present invention, comprising a lyocell tow and triethyl citrate (TEC) dispersed in the lyocell tow within a predetermined content range, can reduce the amount of phenolic substances transferred from smoke passing through the filter, compared to a filter for a smoking article comprising a lyocell tow in which triethyl citrate (TEC) is not dispersed. The amount of phenolic substances transferred from smoke passing through the filter for a smoking article according to an embodiment of the present invention can be reduced by 20% to 55%, 25% to 52%, or 45% to 50%, compared to the amount of phenolic substances transferred from smoke passing through a filter for a smoking article employing a lyocell tow in which triethyl citrate (TEC) is not dispersed.

[0062] In some embodiments, the filter tip for a smoking article may further include a capsule capable of producing a fragrance. Specifically, the filter tip for a smoking article may further include a crushable capsule, which is located within the Lyocell tow and has a structure in which a solution containing a fragrance is wrapped with a film. At least one such crushable capsule may be included within the Lyocell tow in which the triethyl citrate (TEC) is dispersed.

[0063] In some embodiments, the filter for smoking articles may further include a wrapper (or filter wrapper) surrounding the lyocell tow dispersed with triethyl citrate (TEC). As mentioned above, the filter wrapper may have a 90 mg -2 The following basis weights are provided, but the present invention is not limited thereto.

[0064] Hereinafter, the configuration of the present invention and its effects will be described in more detail by way of examples and comparative examples. However, the examples are only used to explain the present invention in more detail, and the scope of the present invention is not limited by these examples.

[0065] Example 1

[0066] After adding triethyl citrate (TEC) at 5 mg / rod to lyocell tow using HAUNI's KDF-2 equipment, the lyocell tow dispersed with triethyl citrate (TEC) was wrapped with winding paper to prepare a filter for smoking articles that met the conditions of 27 mm in length, 7.71 mm in diameter and 400 mm WG / 108 mm in draw resistance.

[0067] Example 2

[0068] Filters for smoking articles were prepared in the same manner as in Example 1, except that triethyl citrate (TEC) was added to the lyocell tow at 10 mg / rod instead of 5 mg / rod.

[0069] Example 3

[0070] A filter for a smoking article was prepared in the same manner as in Example 1, except that triethyl citrate (TEC) was added to the lyocell tow at 20 mg / rod instead of 5 mg / rod.

[0071] Example 4

[0072] A filter for a smoking article was prepared in the same manner as in Example 1, except that triethyl citrate (TEC) was added to the lyocell tow at 30 mg / rod instead of 5 mg / rod.

[0073] Comparative Example 1

[0074] A filter for a smoking article was prepared in the same manner as in Example 1, except that triethyl citrate (TEC) was not added to the lyocell tow as a phenol-reducing substance.

[0075] Experimental Example 1: Evaluation of Phenol Reduction Performance Based on Triethyl Citrate (TEC) Content

[0076] Smoking articles were prepared using the filters for smoking articles of Comparative Example 1 and Examples 1 to 4. Smoke components were collected using a HAUNI LX20 manual (linear type) cigarette smoking machine through a Cambridge filter pad (CFP) under HC smoking conditions (puff volume: 55 ml / puff frequency: 30 seconds / puff duration: 2 seconds / vent blocking). To extract the substances in the collected pad, 30 mL of 1% acetic acid was added, the mixture was stirred, and filtered through a 0.45 μm PVDF syringe filter. The smoke passing through each filter for smoking article was analyzed for phenolic smoke components using a Waters Alliance HPLC-FLD analyzer. The results are shown in Table 1 below.

[0077] Table 1

[0078]

[0079] As shown in Table 1, the amounts of phenolic components transferred were reduced in Examples 1 to 4, which were prepared using Lyocell tows in which triethyl citrate (TEC) was dispersed, compared to Comparative Example 1, in which triethyl citrate (TEC) was not dispersed in the Lyocell tow. Specifically, Examples 1 to 4 were found to have reduced amounts of phenolic components transferred by 20% to 55% and 25% to 52% compared to Comparative Example 1.

[0080] In addition, it can be confirmed that the effect of reducing phenol components varies depending on the content of triethyl citrate (TEC) dispersed in the lyocell tow. Specifically, it can be confirmed that the transfer amount of phenol components in Examples 3 and 4, which include lyocell tows dispersed with triethyl citrate (TEC) at 20 mg / rod and 30 mg / rod, is reduced by 45% to 50%. Compared with Comparative Example 1, Example 1 and Example 2, the transfer amount of phenol components is significantly reduced. On the other hand, although not listed in the table, when the addition amount of triethyl citrate (TEC) is 40 mg / rod or more, triethyl citrate (TEC) is transferred to the winding paper surrounding the lyocell tow, causing the winding paper to become wet or ink to smudge, thereby confirming the existence of a problem of quality deterioration of the filter tip used for smoking products.

[0081] The above-mentioned filter for smoking articles according to the present invention can be applied to smoking articles. Figure 1 1 is a diagram showing a schematic structure of a smoking article according to a specific embodiment of the present invention. The smoking article 100 includes a smoking material portion 10 and a filter portion 20. The filter for smoking articles described above can be 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.

[0082] The smoking material portion 10 may be filled with smoking materials such as raw tobacco leaves, reconstituted tobacco leaves, or a mixture of tobacco leaves and reconstituted tobacco leaves. The processed smoking material may be filled into the smoking material portion 10 in the form of thin sheets or pipe tobacco shreds. The smoking material portion 10 may have an elongated, long rod shape. There are no particular restrictions on its length, circumference, and diameter, but it may be adjusted to dimensions commonly used in the art based on the amount of smoking material filled, user preferences, and the like. The smoking material portion 10 may include at least one aerosol-forming substance 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 flavorings, wetting agents, and / or acetate compounds. The aerosol-forming substance and additives may be contained in the smoking material.

[0083] The filter portion 20 is located downstream of the smoking material portion 10 so as to serve as a filter that passes through the aerosol material generated in the smoking material portion 10 before the user inhales it. The above-mentioned filter portion 20 can be made of various materials or shapes. According to a specific embodiment of the present invention, the filter portion 20 basically includes the above-mentioned filter for smoking articles comprising a lyocell tow containing a plurality of lyocell fibers and triethyl citrate (TEC) dispersed on the above-mentioned lyocell tow. The above-mentioned filter for smoking articles comprising lyocell tow and triethyl citrate (TEC) can replace all or part of the filter portion 20 of an existing smoking article. When replacing a part, the filter material used in the past can be used together. Existing filter materials may include, for example, cellulose acetate filters, paper filters, hollow tube filters, etc.

[0084] although Figure 1 The middle filter portion 20 is shown as a single filter consisting of a single filter, but the present invention is not limited thereto. For example, the filter portion 20 may be configured as a double filter or triple filter having two or more filters to improve filtration efficiency.

[0085] In some embodiments, when the filter portion 20 is configured as a double filter or a triple filter, any one of the plurality of filters may be a filter comprising a lyocell tow containing lyocell fibers and triethyl citrate (TEC) dispersed in the lyocell tow (hereinafter referred to as a lyocell filter), while another of the plurality of 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 portion 20.

[0086] In addition, although not shown in the drawings, the smoking article 100 may further include a hollow tube structure, which is a tubular structure having a hollow interior. The hollow tube structure may be located downstream of the filter portion 20 including the lyocell filter.

[0087] In some embodiments, the hollow tube structure may be formed with perforations, but is not limited thereto. The hollow tube structure may not be formed with perforations. In some embodiments, when perforations are formed in the hollow tube structure, the perforations may be formed at a distance of 10 mm to 15 mm upstream from the downstream end of the smoking article 100.

[0088] The exterior of the smoking material portion 10 and the filter portion 20 may be wrapped with wrapping paper (smoking material portion wrapping paper 30a or filter portion wrapping paper 30b).

[0089] The above-mentioned smoking material portion 10 can be wrapped by a smoking material portion wrapper 30a. In general, a portion of the cigarette smoke generated during the combustion process of the smoking material portion 10 is released into the atmosphere through the smoking material portion wrapper 30a before passing through the filter portion 20, and the sidestream smoke causes discomfort to secondhand smokers. In order to reduce the above-mentioned sidestream smoke, various attempts have been made, such as adding fillers such as magnesium oxide, titanium oxide, cerium oxide, aluminum oxide, calcium carbonate, and zirconium carbonate to existing cigarette papers. However, when simply using these fillers to reduce sidestream smoke, problems such as reduced smoking sensation, or extinguished combustion and reduced ash integrity occur. Therefore, it is difficult to solve the above-mentioned problems by appropriately combining the materials used for the fillers. In some embodiments, in order to prevent the reduction of smoking sensation, reduced ash integrity and extinguished combustion while reducing sidestream smoke, the smoking material portion wrapper 30a can use a filler of mixed magnesium oxide (MgO and / or Mg(OH)2) and calcium carbonate (CaCO3).

[0090] The filter tip 20 can be wrapped by a filter tip wrapper 30b. The filter tip wrapper 30b can be made of oil-resistant paper, and the inner side of the filter tip wrapper 30b can further include aluminum foil. As mentioned above, the filter tip wrapper 30b can have a 90mg -2 The following basis weights are provided, but the present invention is not limited thereto.

[0091] The smoking material portion 10 wrapped by the smoking material portion wrapping paper 30a and the filter portion 20 wrapped by the filter portion wrapping paper 30b can be combined and wrapped by the tipping paper 40. The tipping paper 40 can be wrapped around the Figure 1 , at least a portion (e.g., a portion of the downstream area) of the smoking material portion wrapper 30a and the periphery of the filter portion wrapper 30b are wrapped. In other words, at least a portion of the smoking material portion 10 and the filter portion 20 may be further wrapped with tipping paper 40 to physically bond them together. In one embodiment of the present invention, the tipping paper 40 may be made of non-porous wrapping paper that has not undergone oil-resistant treatment, but the present invention is not limited to this. Furthermore, the tipping paper 40 may also include a non-combustible material to prevent the filter portion 20 from burning, but the present invention is not limited to this.

[0092] Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, those skilled in the art with common sense in the art to which the present disclosure pertains will appreciate that the present disclosure may be implemented in other specific forms without changing the technical concepts or essential features of the present disclosure. Therefore, it should be understood that the above embodiments are illustrative and non-restrictive in all respects. The scope of protection of the present disclosure shall be determined by the claims, and all interpretations of the technical spirit within the scope of equivalents shall fall within the scope of the technical concepts defined by the present disclosure.

Claims

1. A filter tip for a smoking article, characterized in that: include: Lyocell tow, comprising lyocell fibres, and a phenol-reducing substance dispersed in said lyocell tow; The above-mentioned phenol-reducing substances include triethyl citrate, The content of the triethyl citrate per 1 mm length of the lyocell tow is 0.11 mg to 1.85 mg.

2. The filter tip for a smoking article according to claim 1, wherein The content of the triethyl citrate per 1 mm length of the lyocell tow is 0.18 mg to 1.2 mg.

3. The filter tip for a smoking article according to claim 2, characterized in that The content of the triethyl citrate per 1 mm length of the lyocell tow is 0.5 mg to 0.95 mg.

4. The filter tip for a smoking article according to claim 3, characterized in that The content of the triethyl citrate per 1 mm length of the lyocell tow is 0.6 mg to 0.85 mg.

5. The filter tip for a smoking article according to claim 1, characterized in that The hardness of the filter for smoking articles is 70% to 95%.

6. The filter tip for a smoking article according to claim 1, wherein The lyocell fiber has a special-shaped cross section.

7. A smoking article, characterized in that include: Department of Smoking Substances, a filter portion located downstream of the smoking material portion, and a wrapping paper surrounding the smoking material portion or the filter portion; The filter portion includes: Lyocell tow, comprising lyocell fibres, and a phenol-reducing substance dispersed in said lyocell tow; The above-mentioned phenol-reducing substances include triethyl citrate, The content of the triethyl citrate per 1 mm length of the lyocell tow is 0.11 mg to 1.85 mg.

8. The smoking article according to claim 7, characterized in that The content of the triethyl citrate per 1 mm length of the lyocell tow is 0.6 mg to 0.85 mg.

9. The smoking article according to claim 7, characterized in that The lyocell fiber has a special-shaped cross section.

10. The smoking article according to claim 7, characterized in that The filter portion further includes a capsule capable of generating flavor.

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