Filter for smoking article comprising lyocell tow, method of making and smoking article comprising same

Abstract

The invention provides a filter tip for a smoking product, a preparation method thereof and the smoking product. A filter for a smoking article comprises: a lyocell tow comprising a plurality of lyocell fibers; and a phenol-based functional additive dispersed in the lyocell tow and containing a phenol-based reducing substance and a hydrophobic emulsion.

Description

Technical Field

[0001] The present invention relates to a filter tip for smoking articles, which increases the residual amount of phenol-reducing substances by adding a phenol-reducing substance and a hydrophobic emulsion to lyocell tow, a preparation method thereof, and a smoking article comprising the filter tip. Background Art

[0002] Cigarette filters typically include cellulose acetate tow (tow), which is acetylated and 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 instead 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, which are 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, since lyocell has a hydrophilic property, even if the phenol-reducing substance is added to lyocell, the hydrophilic lyocell will not plasticize. Therefore, in the prior art, when a phenol-reducing substance that also performs a plasticizer function is applied to lyocell with respect to cellulose acetate fiber, the phenol-reducing substance not only fails to act as a plasticizer for the lyocell, but also fails to chemically bond with the lyocell. Therefore, although there is the advantage of not reducing the biodegradability of lyocell, it is difficult to add the phenol-reducing substance to lyocell and stably place (bind) it, and therefore there is a problem of insufficient residual amount of the phenol-reducing substance in a cigarette filter to which a lyocell tow formed by lyocell is applied.

[0006] Therefore, there is a need for a method for increasing the residual amount of the phenol-reducing substance in a cigarette filter using the lyocell tow by stably placing the phenol-reducing substance added to the hydrophilic lyocell tow on the lyocell tow. 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 containing lyocell tow. The filter tip for smoking articles mixes a phenol-reducing substance with a hydrophobic emulsion and adds the mixture to the lyocell tow, so that the phenol-reducing substance is evenly and stably arranged on the lyocell tow, thereby minimizing the loss of the phenol-reducing substance, increasing its residual amount, and having an excellent phenol-reducing effect.

[0009] Another problem to be solved by the present invention is to provide a method for preparing a filter tip for a smoking article comprising a lyocell tow. The method for preparing a filter tip for a smoking article comprises performing a process of adding a phenol-reducing functional additive comprising a phenol-reducing substance and a hydrophobic emulsion to the lyocell fibers in the lyocell tow, so that the phenol-reducing substance is evenly and stably placed on the lyocell tow.

[0010] In addition, another problem to be solved by the present invention is to provide a preparation process for filter tips for smoking articles comprising lyocell tow. In the process of emulsion-treating lyocell fibers in the process of preparing lyocell tow, the preparation process for filter tips for smoking articles improves the efficiency of the manufacturing process by adding a mixed solution formed by mixing a hydrophobic emulsion with a phenol-reducing substance. No additional process is required, thereby improving the efficiency of the manufacturing process.

[0011] Another problem to be solved by the present invention is to provide a smoking product including a filter tip for smoking products. The above-mentioned smoking product minimizes the loss of phenol-reducing substances, increases the residual amount thereof, and has an excellent phenol-reducing effect by including a filter tip for smoking products that uses a lyocell tow to which a phenol-functional additive is added, which is made of a mixed phenol-reducing substance and a hydrophobic emulsion.

[0012] The technical problems of the present invention are not limited to the technical problems described above. Through the following description, those skilled in the art can clearly understand other technical problems not mentioned.

[0013] Solutions to the Problem

[0014] According to one embodiment, a filter for a smoking article for solving the above-mentioned problem includes: a lyocell tow comprising a plurality of lyocell fibers; and a phenol functional additive dispersed in the lyocell tow, comprising a phenol-reducing substance and a hydrophobic emulsion.

[0015] In addition, the phenol-reducing substance may include at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0016] In addition, the phenol-reducing substance may include one of triethyl citrate (TEC) and polyethylene glycol (PEG), and the content of the phenol-reducing substance may be 0.5 wt % to 15 wt % relative to the weight of the lyocell tow.

[0017] Furthermore, the content of the phenol-reducing substance may be 1 wt % to 6 wt % relative to the weight of the lyocell tow.

[0018] In addition, the phenol-reducing substance may include triethyl citrate (TEC) and polyethylene glycol (PEG), and the content of the phenol-reducing substance may be 10 wt % to 30 wt % relative to the weight of the lyocell tow.

[0019] Furthermore, the content of the phenol-reducing substance may be 15 wt % to 25 wt % relative to the weight of the lyocell tow.

[0020] Furthermore, the phenolic functional additive may be dispersed in the lyocell tow in a brush-type (acid bath-type) or spray-type manner.

[0021] Furthermore, the lyocell tow in which the phenolic functional additive is dispersed may be obtained by spraying a mixed solution of the phenol-reducing substance and the hydrophobic emulsion onto the lyocell fibers using the spray method and drying the mixed solution.

[0022] The filter for smoking articles can be produced by spraying a mixed solution of the phenol-reducing substance and the hydrophobic emulsion onto the lyocell tow made of lyocell fibers in a brush-type (acid bath-type) manner and drying the mixture.

[0023] A method for preparing a filter for a smoking article according to one embodiment, which addresses the aforementioned other problem, may include the following steps: preparing a plurality of lyocell fibers; preparing a mixed solution by mixing a phenol-reducing substance with a hydrophobic emulsion; spraying the mixed solution onto the plurality of lyocell fibers and drying the mixture to prepare a lyocell tow in which a phenol-functional additive including the phenol-reducing substance and the hydrophobic emulsion is dispersed; and wrapping the lyocell tow in which the phenol-functional additive is dispersed with a wrapping paper. The phenol-reducing substance includes at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0024] According to another embodiment, a method for preparing a filter for a smoking article, which solves the aforementioned problem, may include the following steps: preparing a lyocell tow comprising a plurality of lyocell fibers; preparing a mixed solution by mixing a phenol-reducing substance with a hydrophobic emulsion; spraying the mixed solution onto the lyocell tow and drying the solution to disperse a phenol-functional additive comprising the phenol-reducing substance and the hydrophobic emulsion on the lyocell tow; and wrapping the lyocell tow containing the phenol-functional additive with a wrapping paper. The phenol-reducing substance may comprise at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0025] A smoking article according to one embodiment, for solving yet another problem, includes a smoking material portion, a filter portion, and a wrapper. The filter portion includes: a lyocell tow comprising a plurality of lyocell fibers; and a phenol-based functional additive dispersed in the lyocell tow, comprising a phenol-reducing substance and a hydrophobic emulsion. The phenol-reducing substance includes at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0026] Effects of the Invention

[0027] According to a filter tip for smoking articles of one embodiment, a phenol-reducing substance is mixed with a hydrophobic emulsion and added to a lyocell tow, so that the phenol-reducing substance is evenly and stably disposed on the lyocell tow, thereby minimizing the disappearance of the phenol-reducing substance and increasing its residual amount, so as to improve the phenol-reducing performance of the filter tip for smoking articles using lyocell fiber.

[0028] According to some embodiments of the filter for smoking articles, a phenol-reducing substance is mixed with a hydrophobic emulsion and added to a lyocell tow, so that the hydrophobic emulsion is disposed on the lyocell fibers constituting the lyocell tow, thereby making the surface of the lyocell fibers hydrophobic to prevent moisture from penetrating into the lyocell tow during storage of the lyocell tow.

[0029] 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

[0030] Figure 1 This is a diagram showing a schematic structure of a smoking article according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] When adding reference numerals to components in all drawings, it should be noted that the same reference numerals refer to the same components even when they are shown in different drawings. Furthermore, in the course of describing the present disclosure, if a detailed description of the configuration or function of a related known technology is deemed to obscure the gist of the present disclosure, such detailed description may be omitted.

[0033] 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 singular also include plural forms.

[0034] 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 a component from other components, 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 may also be indirectly "connected," "coupled," or "linked" via a third component.

[0035] The terms “include” 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.

[0036] First, some terms used in this specification will be clarified.

[0037] 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.

[0038] In this specification, "smoking material" may refer to any type of substance that can be used in a smoking article.

[0039] In this specification, “upstream” or “upstream direction” may refer to a direction away from the mouth of a smoker, and “downstream” or “downstream direction” may refer to a direction toward the mouth of a smoker.

[0040] In this specification, "longitudinal direction" may refer to the direction corresponding to the longitudinal axis of the smoking article.

[0041] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0042] Figure 1 This is a diagram showing a schematic structure of a smoking article according to an embodiment of the present invention.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The present invention relates to a filter 20 (or a filter portion) for a smoking article disposed within a smoking article 100. According to one embodiment of the present invention, the filter 20 comprises: a lyocell tow comprising a plurality of lyocell fibers; and a phenol-based functional additive dispersed within the lyocell tow, comprising a phenol-reducing substance and a hydrophobic emulsion. The lyocell fibers are environmentally friendly fibers made from cellulose extracted from wood pulp. The lyocell tow is a bundle formed by cross-linking adjacent lyocell fibers.

[0047] In an exemplary embodiment, 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.

[0048] In exemplary 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.

[0049] In one embodiment, the phenol-based functional additive may include a phenol-reducing substance and a hydrophobic emulsion. The phenol-based functional additive may be dispersed on the lyocell tow by spraying a mixed solution prepared by mixing the phenol-reducing substance and the hydrophobic emulsion in a manufacturing process for a smoking article filter onto lyocell fibers or lyocell tow, followed by drying.

[0050] In some embodiments, the phenol functional additives can be dispersed on the lyocell tow by spraying a mixed solution prepared by mixing a phenol reducing substance and a hydrophobic emulsion onto the lyocell fiber or lyocell tow in a brushing manner (acid bath manner) or a spray manner and drying.

[0051] As described below, a mixed solution prepared by mixing a phenol-reducing substance and a hydrophobic emulsion can be sprayed onto lyocell fibers in a lyocell tow preparation process, or can be sprayed onto lyocell tow made of lyocell fibers in a lyocell tow preparation process for a filter 20 for a smoking article.

[0052] In one embodiment, the phenol-reducing substance is a substance that specifically reduces phenols produced during smoking. The phenol-reducing substance includes at least one of polyethylene glycol (PEG) and triethyl citrate (TEC). However, the present invention is not limited thereto. As long as the phenol-reducing functional substance can reduce phenols produced during smoking, there is no limitation.

[0053] The smoking filter according to the present invention is prepared by mixing a phenol-reducing substance and a hydrophobic emulsion and spraying the mixture onto a lyocell tow, thereby achieving an excellent phenol-reducing effect. As described below, the smoking filter according to the present invention combines a hydrophobic emulsion and a phenol-reducing substance and adds them to a lyocell tow, thereby achieving an excellent phenol-reducing effect compared to a smoking filter without the phenol-reducing substance. Specifically, the phenol content in smoke from a smoking filter containing a phenol-reducing substance according to the present invention can be reduced by 49% or more, 50% or more, 51% or more, or 52% or more compared to smoke from a smoking filter without the phenol-reducing substance.

[0054] In some embodiments, the phenol-reducing substance may include at least one of polyethylene glycol (PEG) and triethyl citrate (TEC). When the phenol-reducing substance includes one of polyethylene glycol (PEG) and triethyl citrate (TEC), the content of the phenol-reducing substance relative to the weight of the lyocell tow may be 0.5 wt % to 15 wt %, 0.5 wt % to 12 wt %, 0.5 wt % to 10 wt % or less, 0.5 wt % to 8 wt %, 1 wt % to 6 wt %, 2 wt % to 5 wt %, 2.1 wt % to 4.9 wt %, or 2.25 wt % to 4.8 wt %.

[0055] In some embodiments, the phenol-reducing substance may include triethyl citrate (TEC). When the phenol-reducing substance includes triethyl citrate (TEC), the content of triethyl citrate (TEC) relative to the weight of the lyocell tow may be 0.5 wt% to 15 wt%, 0.5 wt% to 12 wt%, 0.5 wt% to less than 10 wt%, 0.5 wt% to 8 wt%, 1 wt% to 6 wt%, 2 wt% to 5 wt%, 2.1 wt% to 4.8 wt%, or 2.3 wt% to 4.7 wt%.

[0056] In some embodiments, the phenol-reducing substance includes triethyl citrate (TEC), which can be sprayed and added together with the hydrophobic emulsion during the preparation process of the lyocell tow. Specifically, in the preparation process of the lyocell tow, the phenol-reducing substance can be added by spraying the TEC together with the hydrophobic emulsion onto the lyocell fiber. In this case, the content of triethyl citrate (TEC) relative to the weight of the lyocell tow can be 2.5 wt% to 4.9 wt%, 2.6 wt% to 4.8 wt%, or 2.7 wt% to 4.75 wt%, preferably, 2.75 wt% to 2.85 wt%, or 4.65 wt%, or 4.75 wt%.

[0057] In some other embodiments, the phenol-reducing substance includes triethyl citrate (TEC), which can be sprayed and added together with the hydrophobic emulsion in the process of preparing a filter for a smoking article using lyocell tow. Specifically, triethyl citrate (TEC) can be sprayed and added together with the hydrophobic emulsion on a lyocell tow made of lyocell fibers in the process of preparing a filter for a smoking article. In this case, the content of triethyl citrate (TEC) relative to the weight of the lyocell tow can be 2 wt% to 4.5 wt%, 2.1 wt% to 4.4 wt%, 2.2 wt% to 4.3 wt%, and preferably, 2.25 wt% to 2.35 wt%, or 4.15 wt% to 4.25 wt%.

[0058] In some embodiments, the phenol-reducing substance may include polyethylene glycol (PEG).

[0059] In some embodiments, the weight average molecular weight (MW) of the polyethylene glycol (PEG) contained in the phenol-reducing substance may be 100 to 10,000, preferably 100 to 8,000, more preferably 100 to 2,000, and most preferably 500 to 700. When the phenol-reducing functional additive dispersed in the lyocell tow includes polyethylene glycol (PEG) having a weight average molecular weight within the above range as the phenol-reducing substance, the filter for a smoking article prepared using the lyocell tow may have excellent phenol-reducing performance.

[0060] When the phenol-reducing substance includes polyethylene glycol (PEG), the content of polyethylene glycol (PEG) relative to the weight of the lyocell tow can be 0.5 wt% to 15 wt%, 0.5 wt% to 12 wt%, 0.5 wt% to 10 wt% or less, 0.5 wt% to 8 wt%, 1 wt% to 6 wt%, 2 wt% to 5 wt%, 2.2 wt% to 4.95 wt%, 2.35 wt% to 4.9 wt%, or 2.4 wt% to 4.85 wt%.

[0061] In some embodiments, the phenol-reducing substance includes polyethylene glycol (PEG), which can be sprayed and added together with the hydrophobic emulsion during the preparation process of the lyocell tow. Specifically, in the preparation process of the lyocell tow, the polyethylene glycol (PEG) can be added by spraying the hydrophobic emulsion together with the lyocell fiber. In this case, the content of the polyethylene glycol (PEG) relative to the weight of the lyocell tow can be 2.6 wt% to 4.95 wt%, 2.7 wt% to 4.9 wt%, 2.75 wt% to 4.85 wt%, preferably, 2.8 wt% to 2.85 wt%, or 4.8 wt%, or 4.85 wt%.

[0062] In some other embodiments, the phenol-reducing substance includes polyethylene glycol (PEG), which can be sprayed and added together with the hydrophobic emulsion in the process of preparing a filter for a smoking article using lyocell tow. Specifically, the polyethylene glycol (PEG) can be sprayed and added together with the hydrophobic emulsion onto a lyocell tow made of lyocell fibers in the process of preparing a filter for a smoking article. In this case, the content of the polyethylene glycol (PEG) relative to the weight of the lyocell tow can be 2.1 wt% to 4.6 wt%, 2.2 wt% to 4.5 wt%, 2.3 wt% to 4.4 wt%, 2.4 wt% to 4.35 wt%, preferably, 2.4 wt% to 2.5 wt%, or 4.25 wt% to 4.35 wt%.

[0063] In some embodiments, the phenol-reducing substance may include both polyethylene glycol (PEG) and triethyl citrate (TEC). When the phenol-reducing substance includes both polyethylene glycol (PEG) and triethyl citrate (TEC), the content of the phenol-based functional additive relative to the weight of the lyocell tow may be 5 wt% to 30 wt%, 7 wt% to 28 wt%, 10 wt% to 25 wt%, 12 wt% to 23 wt%, 15 wt% to 20 wt%, 16 wt% to 19.5 wt%, or 16.5 wt% to 19 wt%.

[0064] In some embodiments, the phenol-reducing substance includes polyethylene glycol (PEG) and triethyl citrate (TEC), and the phenol-reducing substance including polyethylene glycol (PEG) and triethyl citrate (TEC) can be sprayed and added together with the hydrophobic emulsion during the preparation process of the lyocell tow. Specifically, in the preparation process of the lyocell tow, the phenol-reducing substance can be added by spraying the polyethylene glycol (PEG) and triethyl citrate (TEC) together with the hydrophobic emulsion onto the lyocell fiber. In this case, the total content of polyethylene glycol (PEG) and triethyl citrate (TEC) relative to the weight of the lyocell tow can be 16 wt% to 20 wt%, 17 wt% to 19 wt%, or 18.5 wt% to 19 wt%.

[0065] In some embodiments, the phenol-reducing substance includes polyethylene glycol (PEG) and triethyl citrate (TEC), and the phenol-reducing substance including polyethylene glycol (PEG) and triethyl citrate (TEC) can be sprayed and added together with the hydrophobic emulsion during the preparation process of the lyocell tow. Specifically, in the preparation process of the lyocell tow, the phenol-reducing substance can be added by spraying the polyethylene glycol (PEG) and triethyl citrate (TEC) together with the hydrophobic emulsion onto the lyocell fiber. In this case, the total content of polyethylene glycol (PEG) and triethyl citrate (TEC) relative to the weight of the lyocell tow can be 16 wt% to 20 wt%, 17 wt% to 19 wt%, or 18.5 wt% to 19 wt%.

[0066] In one embodiment, a hydrophobic emulsion is applied to lyocell fibers, unlike emulsions used for general fibers, and may be specifically developed for lyocell fibers. The hydrophobic emulsion may contain a hydrophobic component that allows the phenol-reducing substance to be evenly and stably deposited on the hydrophilic lyocell fibers or lyocell tow. The hydrophobic emulsion is a food-safe and harmless ingredient.

[0067] By mixing a phenol-reducing substance with a hydrophobic emulsion and adding the mixture to the lyocell tow constituting the filter for a smoking article according to the present invention, the compatibility between the phenol-reducing substance and the hydrophilic lyocell surface is improved, allowing the phenol-reducing substance to be stably deposited on the lyocell surface by means of the hydrophobic emulsion. Consequently, the content of the phenol-reducing substance deposited and remaining on the surface of the lyocell fibers or lyocell tow can be prevented from being reduced, thereby providing a filter for a smoking article having excellent phenol-reducing performance.

[0068] In addition, the hydrophobic emulsion is mixed with a phenol-reducing substance and added to the hydrophilic lyocell tow, thereby making the surface of the lyocell fiber or lyocell tow hydrophobic and delaying the penetration of the smoker's saliva into the filter during smoking, so as to prevent the shape of the filter for smoking articles including the lyocell tow from changing due to the smoker's saliva and causing the hardness of the filter for smoking articles to decrease, and also improve the preservation of the filter for smoking articles.

[0069] In some embodiments, the hydrophobic emulsion may further include a compound that can function as a lubricant or oil. The hydrophobic emulsion may include a component that imparts lubricity to the lyocell fiber introduced into the crimping machine during the crimping process in the lyocell tow preparation process, but the present invention is not limited thereto.

[0070] In some embodiments, a filter for a smoking article comprising a lyocell tow in which a phenolic functional additive is dispersed has a hardness of 70% or more. In exemplary embodiments, the hardness of the filter for a smoking article may be 70% to 90%, 75% to 90% or more, 80% to 90% or more, or 85% to 90%. The hardness of the filter for a smoking article is a value that quantifies 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. The hardness may 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.

[0071] Hereinafter, a method for preparing the filter for smoking articles will be described.

[0072] <First Preparation Method> Preparation of Lyocell Tow by Spraying a Mixed Solution of a Phenol-Reducing Substance and a Hydrophobic Emulsion onto Lyocell Fiber

[0073] According to one embodiment, a method for preparing a filter for a smoking article includes the following steps: preparing a plurality of lyocell fibers; preparing a mixed solution by mixing a phenol-reducing substance with a hydrophobic emulsion; spraying the mixed solution onto the plurality of lyocell fibers and drying the mixed solution to prepare a lyocell tow in which a phenol-functional additive including the phenol-reducing substance and the hydrophobic emulsion is dispersed; and wrapping the lyocell tow in which the phenol-functional additive is dispersed with a wrapping paper. The phenol-reducing substance includes at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0074] Since the above-mentioned preparation method basically relates to the preparation method of the filter for smoking articles, the description of the specific parts in the above content will be omitted, and the features of the manufacturing method will be explained in more detail below.

[0075] First, prepare several strands of lyocell fibers.

[0076] Next, a mixed solution is prepared by mixing a phenol-reducing substance with a hydrophobic emulsion. The phenol-reducing substance may include at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0077] In some embodiments, when the phenol-reducing substance comprises both polyethylene glycol (PEG) and triethyl citrate (TEC), the ratio of the content of triethyl citrate (TEC) to the content of polyethylene glycol (PEG) added to the mixed solution may be 0.2 to 5.0.

[0078] Next, a mixed solution of the phenol-reducing substance and the hydrophobic emulsion is sprayed onto the surface of the lyocell fiber. In one embodiment, the mixed solution can be sprayed directly onto the surface of the lyocell fiber. The spray method refers to a method of spraying liquid through a nozzle.

[0079] In some embodiments, the amount of the mixed solution sprayed on the lyocell fiber may be 15 wt % or less relative to the weight of the lyocell tow, but the present invention is not limited thereto.

[0080] On the other hand, in this step, a phenol-reducing substance composed of triethyl citrate (TEC) or polyethylene glycol (PEG) is mixed with a hydrophobic emulsion, and the mixed solution is sprayed onto the lyocell fiber, thereby imparting hydrophobicity to the surface of the hydrophilic lyocell fiber through the hydrophobic emulsion, so that the phenol-reducing substance can be evenly and stably placed on the surface of the lyocell fiber.

[0081] Next, the lyocell fibers sprayed with the mixed solution are dried to prepare a lyocell tow having a phenol-based functional additive comprising a phenol-reducing substance and a hydrophobic emulsion dispersed on the surface of the lyocell fibers. The drying process can be performed at room temperature or at an elevated temperature using a commonly used method in the art.

[0082] Next, the prepared lyocell tow containing the phenolic functional additive is wrapped with wrapping paper to prepare a filter for a smoking product. If necessary, the lyocell tow can be processed into a size suitable for use in a filter for a smoking product using a mechanical roller or a cutter.

[0083] <Second Preparation Method> A filter is prepared by spraying a mixed solution of a phenol-reducing substance and a hydrophobic emulsion onto a lyocell tow made of lyocell fibers.

[0084] According to another embodiment, a method for preparing a filter for a smoking article includes the following steps: preparing a lyocell tow comprising a plurality of lyocell fibers; preparing a mixed solution by mixing a phenol-reducing substance with a hydrophobic emulsion; spraying and drying the mixed solution on the lyocell tow to disperse a phenol-functional additive comprising the phenol-reducing substance and the hydrophobic emulsion on the lyocell tow; and wrapping the lyocell tow with the phenol-functional additive with a wrapping paper. The phenol-reducing substance comprises at least one of triethyl citrate (TEC) and polyethylene glycol (PEG).

[0085] Specifically, the method for preparing a filter for a smoking article according to another embodiment differs from the aforementioned method in that a mixed solution formed by mixing a phenol-reducing substance and a hydrophobic emulsion is sprayed onto a lyocell tow made of lyocell fibers. For ease of explanation, the following description focuses on the differences from the aforementioned method for preparing a filter for a smoking article according to one embodiment.

[0086] First, a lyocell tow is prepared using lyocell fibers. The process of preparing the lyocell tow using the lyocell fibers can be carried out using conventional methods in the relevant technical field. For example, the lyocell tow can be prepared using the lyocell fibers by emulsion treatment, crimping the lyocell fibers, and the like.

[0087] Next, a mixed solution is prepared by mixing the phenol-reducing substance with the hydrophobic emulsion.

[0088] Next, the prepared mixed solution is sprayed onto the surface of a lyocell tow made of lyocell fibers. In one embodiment, the mixed solution can be sprayed onto the surface of the lyocell tow using a brush method. The brush method may refer to a method in which the liquid is sprayed by bouncing the liquid due to the rotation of a brush roller.

[0089] On the other hand, in this step, a phenol-reducing substance composed of triethyl citrate (TEC) or polyethylene glycol (PEG) is mixed with a hydrophobic emulsion, and the mixed solution is sprayed onto the lyocell tow, thereby imparting hydrophobicity to the surface of the hydrophilic lyocell tow through the hydrophobic emulsion, so that the phenol-reducing substance can be evenly and stably placed on the surface of the lyocell tow.

[0090] Next, the lyocell tow sprayed with the mixed solution is dried to disperse the phenolic functional additive comprising the phenol-reducing substance and the hydrophobic emulsion on the surface of the lyocell tow. Next, the lyocell tow dispersed with the phenolic functional additive is wrapped with a wrapping paper.

[0091] 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.

[0092] Comparative Example 1

[0093] Using a filter manufacturing machine manufactured by TYM Corporation (the operating mechanism is the same as that of the filter manufacturing machine for CA tow), a lyocell tow containing a plurality of lyocell fibers was wrapped with wrapping paper to prepare a filter for smoking articles weighing about 865 mg and having a circumference of about 24.58 mm.

[0094] Example 1

[0095] A filter for a smoking article was prepared in the same manner as in Comparative Example 1, except that a mixed solution of a hydrophobic emulsion and triethyl citrate (TEC) was added (sprayed). Specifically, a mixed solution of triethyl citrate (TEC) and a hydrophobic emulsion was prepared at 11.3% by weight relative to the weight of the lyocell tow. This mixed solution was sprayed onto the same lyocell tow as in Comparative Example 1 and dried to produce a filter for a smoking article.

[0096] Example 2

[0097] A filter for a smoking article was prepared in the same manner as in Comparative Example 1, except that a mixed solution of a hydrophobic emulsion and polyethylene glycol (PEG) was added (sprayed). Specifically, a mixed solution of polyethylene glycol (PEG) and a hydrophobic emulsion was prepared at 2.8% by weight relative to the weight of the lyocell tow. The mixed solution was sprayed onto the same lyocell tow as in Comparative Example 1 and dried to prepare a filter for a smoking article.

[0098] Example 3

[0099] A filter for a smoking article was prepared in the same manner as in Comparative Example 1, except that a mixed solution of a hydrophobic emulsion, polyethylene glycol (PEG), and triethyl citrate (TEC) was added (sprayed). Specifically, a mixed solution of 11.3% by weight of triethyl citrate (TEC) relative to the weight of the Lyocell tow, 2.8% by weight of polyethylene glycol (PEG), and the hydrophobic emulsion was prepared. The mixed solution was sprayed onto the same Lyocell tow as in Comparative Example 1 and dried to produce a filter for a smoking article.

[0100] [Experimental Example 1] Comparison of physical evaluation of filters for smoking articles according to the addition of mixed solution

[0101] The physical properties of Comparative Example 1 and Examples 1 to 3 were evaluated, and the results are shown in Table 1 below.

[0102] Table 1

[0103]

[0104] As shown in Table 1, Examples 1 to 3, prepared by spraying a mixed solution of a phenol-reducing substance and a hydrophobic emulsion onto a lyocell tow, exhibited similar values for draw resistance, weight, and circumference as Comparative Example 1, in which no additive was added to the lyocell tow. Therefore, it was confirmed that the physical properties of the filter for a smoking article using a lyocell tow in which a phenol-reducing functional additive including a phenol-reducing substance and a hydrophobic emulsion was dispersed were maintained.

[0105] [Experimental Example 2]: Evaluation of phenol reduction performance of filters for smoking articles by addition of a mixed solution

[0106] Smoking articles were prepared using the filters for smoking articles of Comparative Example 1 and Examples 1 to 3. Smoke components were collected using a Cambridge filter pad (CFP) using a HAUNI LX20 manual (linear type) cigarette smoking machine as a smoking device. To extract the substances in the collected pad, 30 mL of 1% acetic acid was added, followed by stirring. The mixture was then filtered through a 0.45 μm PVDF syringe filter and analyzed using a Waters Alliance HPLC-FLD analyzer. The results are shown in Table 2 below.

[0107] Table 2

[0108]

[0109] As shown in Table 2 above, it can be confirmed that the phenol component detected in Comparative Example 1 in which the mixed solution obtained by mixing the phenol-reducing substance and the hydrophobic emulsion was not added to the lyocell tow was 43.4 ug, while the phenol components detected in Examples 1 to 3 prepared by adding the mixed solution obtained by mixing the phenol-reducing substance and the hydrophobic emulsion to the lyocell tow were 29 ug, 26.5 ug and 21.9 ug, respectively. It can be confirmed that the phenol component reduction effect of Examples 1 to 3 is approximately 50% or more compared with that of Comparative Example 1.

[0110] Comparative Example 2

[0111] Lyocell tow is prepared by spraying a hydrophobic emulsion directly onto lyocell fibers in a spraying manner and drying, and then the prepared lyocell tow is wrapped with wrapping paper to prepare a filter for a smoking article.

[0112] Example 4

[0113] A filter for a smoking article was prepared in the same manner as in Comparative Example 2, except that lyocell tow was prepared by spraying a mixed solution of 3 wt % triethyl citrate (TEC) and a hydrophobic emulsion on lyocell fibers and drying the solution.

[0114] Example 5

[0115] A filter for a smoking article was prepared in the same manner as in Example 4, except that the content of triethyl citrate (TEC) in the mixed solution sprayed on the lyocell fibers was 5 wt % relative to the lyocell tow.

[0116] Example 6

[0117] A filter for a smoking article was prepared in the same manner as in Example 4, except that the phenol-reducing substance contained in the mixed solution sprayed on the lyocell fibers was 3 wt% of polyethylene glycol (PEG) relative to the lyocell tow.

[0118] Example 7

[0119] A filter for a smoking article was prepared in the same manner as in Example 6, except that the content of polyethylene glycol (PEG) in the mixed solution sprayed on the lyocell fibers was 5 wt % relative to the lyocell tow.

[0120] Example 8

[0121] Filters for smoking articles were prepared in the same manner as in Comparative Example 2, except that the phenol-reducing substance contained in the mixed solution sprayed onto the lyocell fibers included both triethyl citrate (TEC) and polyethylene glycol (PEG), and the content of the above-mentioned phenol-reducing substance was 20 wt % relative to the lyocell tow.

[0122] Comparative Example 3

[0123] A filter for a smoking article is prepared by indirectly spraying a hydrophobic emulsion on a lyocell tow made of lyocell fibers in a brush manner and drying the same, and then wrapping the lyocell tow with a wrapping paper.

[0124] Example 9

[0125] A filter for a smoking article was prepared in the same manner as in Comparative Example 3, except that a mixed solution of triethyl citrate (TEC) and a hydrophobic emulsion at 3 wt % relative to the lyocell tow was sprayed on the lyocell tow.

[0126] Example 10

[0127] A filter for a smoking article was prepared in the same manner as in Example 9, except that the content of triethyl citrate (TEC) in the mixed solution sprayed on the lyocell tow was 5 wt % relative to the lyocell tow.

[0128] Example 11

[0129] A filter for a smoking article was prepared in the same manner as in Example 9, except that the phenol-reducing substance contained in the mixed solution sprayed on the lyocell tow was 3 wt% of polyethylene glycol (PEG) relative to the lyocell tow.

[0130] Example 12

[0131] A filter for a smoking article was prepared in the same manner as in Example 11, except that the content of polyethylene glycol (PEG) in the mixed solution sprayed on the lyocell tow was 5 wt % relative to the lyocell tow.

[0132] Example 13

[0133] A filter for a smoking article was prepared in the same manner as in Comparative Example 3, except that the mixed solution sprayed on the lyocell tow contained both triethyl citrate (TEC) and polyethylene glycol (PEG), and the content of the phenol-reducing substance was 20 wt % relative to the lyocell tow.

[0134] [Experimental Example 3]: Analysis of the Residual Amount of Phenol-Reducing Substances in Filters for Smoking Products

[0135] To determine the residual amount of phenol-reducing substances in the filters of the smoking articles of Comparative Examples 2 to 3 and Examples 4 to 13, random samples were taken from the smoking filters and the weight of the filter samples was measured. To determine the weight of the wrapping paper, the lyocell tow portion was removed from the smoking filter and the weight of the wrapping paper was measured. Subsequently, 50 mL of the extract solution contained in the internal standard solution was added to each sample and stirred for 60 minutes. The triethyl citrate (TEC) component was analyzed using GC-FID (DB-WAX column), and the polyethylene glycol (PEG) component was analyzed using HPLD to determine the residual amount of phenol-reducing substances. The results are shown in Table 3 below.

[0136] Table 3

[0137]

[0138] As shown in Table 3, the amount of phenol-reducing substance remaining in the filter of a smoking article differs depending on the spraying method used for a mixed solution containing the same amount of phenol-reducing substance and a hydrophobic emulsion. Specifically, compared to Examples 9 to 13, in which the phenol-reducing substance and the hydrophobic emulsion were mixed and sprayed onto the lyocell tow using a brush method, the amount of phenol-reducing substance remaining in the lyocell tow was higher in Examples 4 to 8, in which the phenol-reducing substance and the hydrophobic emulsion were mixed and sprayed onto the lyocell fibers using a spray method. This is expected to be because spraying the mixed solution onto the lyocell fibers using a spray method during the lyocell tow preparation process allows for more uniform coating than using a brush method, and the surface area of the lyocell fibers available for the mixed solution to be deposited increases when spraying the mixed solution onto the lyocell fibers compared to spraying the mixed solution onto the lyocell tow.

[0139] [Experimental Example 4]: Evaluation of phenol reduction performance of filters for smoking products according to the type and content of phenol-reducing substances

[0140] Smoking articles were prepared using the filters for smoking articles of Comparative Examples 2 and 3 and Examples 4 to 13. Smoke components were collected using a HAUNI LX20 manual (linear type) cigarette smoking machine using a Cambridge filter pad (CFP) as a smoking device. To extract the substances in the collected pad, 30 mL of 1% acetic acid was added, followed by stirring. The mixture was then filtered through a 0.45 μm PVDF syringe filter and analyzed using a Waters Alliance HPLC-FLD analyzer. The results are shown in Table 4 below.

[0141] Table 4

[0142]

[0143] As shown in Table 4, it was confirmed that the amount of phenol transfer in Examples 4 to 13, in which a mixed solution of a phenol-reducing substance and a hydrophobic emulsion was added to the Lyocell tow, was significantly reduced compared to Comparative Examples 2 and 3, in which a mixed solution of a phenol-reducing substance and a hydrophobic emulsion was not added to the Lyocell tow. Specifically, it was confirmed that the phenol-reducing effects of Examples 4 to 13 were greater by approximately 49% or more and approximately 50% or more, respectively, compared to Comparative Examples 2 and 3.

[0144] Furthermore, it was confirmed that when filters for smoking articles were prepared by spraying a mixed solution comprising the same phenol-reducing substance and a hydrophobic emulsion, the phenol-reducing effect increased as the content of the phenol-reducing substance increased. Specifically, it was confirmed that in Examples 4 and 5, in which the same phenol-reducing substance was sprayed together with the hydrophobic emulsion using the same method, the phenol-reducing effect of Example 5 was superior, that in Examples 6 and 7, the phenol-reducing effect of Example 7 was superior, that in Examples 9 and 10, the phenol-reducing effect of Example 10 was superior, and that in Examples 11 and 12, the phenol-reducing effect of Example 12 was superior.

[0145] Furthermore, it was confirmed that when a filter for a smoking article was prepared by spraying a mixed solution comprising the same amount of a phenol-reducing substance and a hydrophobic emulsion, the phenol-reducing effect was superior when the phenol-reducing substance contained polyethylene glycol (PEG) compared to when the phenol-reducing substance contained triethyl citrate (TEC). Specifically, it was confirmed that in Examples 4 and 6, in which the same amount of a phenol-reducing substance was sprayed together with a hydrophobic emulsion using the same method, the phenol-reducing effect of Example 6 was superior, in Examples 5 and 7, the phenol-reducing effect of Example 7 was superior, in Examples 9 and 11, the phenol-reducing effect of Example 11 was superior, and in Examples 10 and 12, the phenol-reducing effect of Example 12 was superior.

[0146] In addition, it can be confirmed that phenol reduces performance according to the injection step or the injection method of the mixed solution that the phenols of same content are reduced and mixed with hydrophobic emulsion and different. Specifically, it can be confirmed that, compared with the situation using brush method by which the mixed solution is injected into the lyocell tow, when using spray method by which the mixed solution is injected into the lyocell fiber, phenol reduces effect more excellent. Specifically, it can be confirmed that in Example 4 and Example 9 in which the phenols of the same type are injected with the same content to reduce substance together with the hydrophobic emulsion, the phenols of Example 4 reduce effect more excellent, in Example 5 and Example 10, the phenols of Example 5 reduce effect more excellent, in Example 6 and Example 11, the phenols of Example 6 reduce effect more excellent, in Example 7 and Example 12, the phenols of Example 7 reduce effect more excellent, and in Example 8 and Example 13, the phenols of Example 8 reduce effect more excellent.

[0147] The above-mentioned filter for smoking articles according to the present invention can be applied to smoking articles. Figure 1 1 is a diagram illustrating a schematic structure of a smoking article according to a specific embodiment of the present invention. The smoking article 100 includes a smokeless 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 smokeless material portion 10 is located upstream of the filter portion 20.

[0148] 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.

[0149] The filter portion 20 is located downstream of the smoking material portion 10 so as to function 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 cigarette filter of lyocell tow in which multiple lyocell fibers are bonded by an adhesive. The above-mentioned cigarette filter including lyocell tow 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, hollow tube filters, etc.

[0150] 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.

[0151] In some embodiments, when the filter portion 20 is configured as a double filter or a triple filter, any one of the multiple filter tips may be a filter tip (hereinafter referred to as a lyocell filter tip) comprising lyocell fiber and a phenolic functional additive, while another of the multiple filter tips may be a cellulose acetate filter tip and / or a paper filter tip. In this case, the length of the lyocell filter tip of the present invention may be 25% to 50% of the total length of the filter portion 20.

[0152] In addition, although not shown in the drawings, the filter portion 20 may contain a crushable capsule (not shown in the drawings) having a structure in which a content solution containing a flavor is surrounded by a membrane.

[0153] The exterior of the smoking material portion 10 and the filter portion 20 may be wrapped with a wrapping paper 30a or 30b.

[0154] The smoking material portion 10 can be wrapped in a smoking material portion wrapper 30a. A portion of the cigarette smoke generated during the combustion of the smoking material portion 10 is typically released into the atmosphere through the smoking material portion wrapper 30a before passing through the cigarette filter. This sidestream smoke causes discomfort to secondhand smokers. Various attempts have been made to reduce this sidestream smoke, such as by adding fillers such as magnesium oxide, titanium oxide, cerium oxide, aluminum oxide, calcium carbonate, and zirconium carbonate to existing cigarette paper. However, simply using these fillers to reduce sidestream smoke can lead to problems such as a reduced smoking sensation, extinguished combustion, and reduced ash integrity. Therefore, it is difficult to address these issues by appropriately combining the materials used for the fillers. In some specific embodiments, to reduce sidestream smoke while preventing a reduction in the smoking sensation, reduced ash integrity, and extinguished combustion, the smoking material portion wrapper 30a can be a filler composed of a mixture of magnesium oxide (MgO and / or Mg(OH)2) and calcium carbonate (CaCO3).

[0155] The filter 20 may be wrapped by a filter wrapper 30b. The filter wrapper 30b may be made of oil-resistant paper, and the inner side of the filter wrapper 30b may further include aluminum foil.

[0156] 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 The smoking material portion wrapper 30a shown in FIG. 1 is wrapped around 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. 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.

[0157] In addition, although not shown in the figures, 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 lyocell filter.

[0158] In some embodiments, the hollow tube structure may be provided with perforations, but the present invention is not limited thereto. The hollow tube structure may not be provided with perforations.

[0159] 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 in the upstream direction from the downstream end of the smoking article 100 .

[0160] 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: A lyocell tow comprising a plurality of lyocell fibers; and The phenol functional additive is dispersed in the lyocell tow and contains a phenol reducing substance and a hydrophobic emulsion.

2. The filter tip for a smoking article according to claim 1, wherein The phenol-reducing substance includes at least one of triethyl citrate and polyethylene glycol.

3. The filter tip for a smoking article according to claim 2, characterized in that The phenol-reducing substance comprises one of triethyl citrate and polyethylene glycol, and the content of the phenol-reducing substance is 0.5 wt % to 15 wt % relative to the weight of the lyocell tow.

4. The filter tip for a smoking article according to claim 3, characterized in that The content of the phenol-reducing substance is 1 wt % to 6 wt % relative to the weight of the lyocell tow.

5. The filter tip for a smoking article according to claim 2, characterized in that The phenol-reducing substance comprises triethyl citrate and polyethylene glycol, and the content of the phenol-reducing substance is 10 wt % to 30 wt % relative to the weight of the lyocell tow.

6. The filter tip for a smoking article according to claim 5, characterized in that The content of the phenol-reducing substance is 15 to 25 weight % relative to the weight of the lyocell tow.

7. The filter for smoking articles according to claim 1, characterized in that The phenol functional additive is dispersed in the lyocell tow in a brushing or spraying manner.

8. The filter for smoking articles according to claim 7, characterized in that The lyocell tow in which the phenolic functional additive is dispersed is obtained by spraying a mixed solution of the phenol-reducing substance and the hydrophobic emulsion onto the lyocell fibers using the spray method and then drying the mixed solution.

9. The filter tip for a smoking article according to claim 7, characterized in that The filter for smoking articles is produced by spraying a mixed solution of the phenol-reducing substance and the hydrophobic emulsion onto the lyocell tow made of lyocell fibers in a brush-like manner and drying the mixed solution.

10. A method for preparing a filter tip for a smoking article, characterized in that: include: Steps for preparing multiple lyocell fibers; a step of preparing a mixed solution by mixing a phenol-reducing substance with a hydrophobic emulsion; The step of spraying the mixed solution onto the plurality of lyocell fibers and drying the mixed solution to prepare a lyocell tow in which a phenol-based functional additive including the phenol-reducing substance and the hydrophobic emulsion is dispersed; and The step of wrapping the lyocell tow dispersed with the phenolic functional additive with a tissue paper, Wherein, the phenol-reducing substance includes at least one of triethyl citrate and polyethylene glycol.

11. A method for preparing a filter tip for a smoking article, characterized in that: include: a step of preparing a lyocell tow comprising a plurality of lyocell fibers; a step of preparing a mixed solution by mixing a phenol-reducing substance with a hydrophobic emulsion; a step of spraying the mixed solution on the lyocell tow and drying the mixed solution to disperse the phenol-reducing substance and the hydrophobic emulsion into the lyocell tow; and The step of wrapping the lyocell tow dispersed with the phenolic functional additive with a tissue paper, Wherein, the phenol-reducing substance includes at least one of triethyl citrate and polyethylene glycol.

12. A smoking article comprising a smoking material portion, a filter portion and a wrapping paper, wherein the smoking article is characterized in that: The filter portion includes: A lyocell tow comprising a plurality of lyocell fibers; and Phenol functional additives, dispersed in the above lyocell tow, contain phenol reducing substances and hydrophobic emulsions, The phenol-reducing substance includes at least one of triethyl citrate and polyethylene glycol.

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