Filter for smoking article, and smoking article comprising same

Abstract

Provided are a filter for a smoking article and a smoking article comprising same. The filter for a smoking article includes a filter portion including regenerated cellulose tow including regenerated cellulose-based fibers, activated carbon included in the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow.

Description

Filter for smoking articles and smoking article including the same

[0001] The present invention relates to a filter for smoking products and a smoking product including the same, and more specifically, to a filter for smoking products including activated carbon that includes a binder to have excellent hardness and recovery rate, and simultaneously minimizes the detachment of activated carbon introduced during the manufacture of the filter for smoking products, and a smoking product including the same.

[0002] Generally, since filters for smoking products are the part that consumers bite directly into with their mouths when smoking, it is essential to ensure sufficient mechanical strength and elasticity. Furthermore, it is required to suppress the detachment of activated carbon used as an adsorbent during the filter manufacturing process, prevent contamination of the manufacturing equipment, and ultimately maintain the quality of the final smoking product.

[0003] Conventionally, cellulose acetate (CA) fibers have been widely used as the main material for filters for smoking products. CA fiber-based filters can secure hardness and elasticity of the filter through plasticization by adding plasticizers (e.g., triethyl citrate (TEC), triacetin (TA), etc.), and can more firmly fix activated carbon particles within the fiber structure as an adsorbent to prevent the detachment of activated carbon, thereby preventing the filter from easily losing its shape during smoking, ensuring uniform atomization, and suppressing contamination of the manufacturing equipment and deterioration of the quality of the final product.

[0004] Meanwhile, in the case of regenerated cellulose filters based on Lyocell, Viscose, and other regenerated cellulose fibers, unlike CA fibers, plasticization reactions do not occur due to the aforementioned additives. Therefore, the addition of plasticizers does not contribute to securing the physical properties of filters for smoking products, and as a result, there is a problem in that activated carbon is prone to detachment and sufficient hardness and elasticity (or resilience) are not secured.

[0005] Therefore, in the manufacture of regenerated cellulose fiber-based activated carbon filters, it is necessary to develop technology capable of simultaneously solving issues such as preventing the shedding of activated carbon particles, suppressing contamination of the manufacturing equipment, ensuring sufficient hardness and elasticity, and maintaining the quality of the final smoking product.

[0006] The problem that the present invention aims to solve is to provide a filter for a smoking article and a smoking article including the same, wherein the filter has excellent hardness and elasticity (or resilience) by including a binder dispersed in regenerated cellulose tow containing activated carbon, and the smoking article including the same.

[0007] In addition, when manufacturing a regenerated cellulose filter containing activated carbon, a binder is sprayed and dispersed onto the regenerated cellulose tow, thereby stably fixing the activated carbon within the tow and preventing contamination of the manufacturing device and ingestion of the activated carbon into the consumer's oral cavity. This allows for the provision of a filter for smoking products and a smoking product containing the same.

[0008] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below.

[0009] According to one aspect of the present application, a filter for a smoking article comprises a regenerated cellulose tow comprising a regenerated cellulose-based fiber, activated carbon contained within the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow.

[0010] In some embodiments, the regenerated cellulose-based fiber may include at least one of viscose fiber or lyocell fiber.

[0011] In some embodiments, the regenerated cellulose-based fiber comprises a lyocell fiber, and the regenerated cellulose tow may be a lyocell tow.

[0012] In some embodiments, the binder may include a dextrin-based binder.

[0013] In some embodiments, the binder may include dextrin.

[0014] In some embodiments, the binder is mixed with a solvent and applied in the form of a binder solution, and the solvent may include at least one of a monohydric alcohol, a polyhydric alcohol, and water.

[0015] In some embodiments, the activated carbon may be applied to at least one of powdered activated carbon and granular activated carbon.

[0016] In some embodiments, the activated carbon may be included in an amount of 0.5 mg / mm to 4 mg / mm based on the length of the regenerated cellulose tow.

[0017] In some embodiments, the binder may be included in an amount of 0.5% to 50% by weight based on the total weight of the regenerated cellulose tow.

[0018] According to another aspect of the present application, a smoking article comprises a smoking material portion and a filter for the smoking article disposed downstream of the smoking material portion, wherein the filter for the smoking article comprises a regenerated cellulose tow comprising regenerated cellulose-based fibers, an activated carbon contained within the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow, and a filter portion wrapper surrounding the filter portion.

[0019] In some embodiments, the binder may include dextrin.

[0020] In some embodiments, the regenerated cellulose-based fiber comprises lyocell fiber, the regenerated cellulose tow is lyocell tow, and the binder may be included in an amount of 5% to 20% by weight based on the total weight of the lyocell tow.

[0021] According to a filter for a smoking article and a smoking article including the same, during the manufacturing process of the filter for a smoking article, activated carbon is introduced while or after spraying a binder onto a regenerated cellulose tow (e.g., lyocell tow), thereby stably settling the activated carbon onto the regenerated cellulose tow (e.g., lyocell tow) and minimizing the detachment rate of the activated carbon. Accordingly, contamination inside the manufacturing device is prevented, and the amount of detached activated carbon is minimized, thereby reducing manufacturing costs and improving manufacturing efficiency. Furthermore, as the activated carbon is stably settled inside the regenerated cellulose tow, the problem of the activated carbon entering the consumer's oral cavity can also be minimized.

[0022] In addition, in a filter for a smoking article containing activated carbon and a smoking article containing the same, by dispersing a binder in a regenerated cellulose tow containing activated carbon, the hardness and elasticity (or resilience) of the regenerated cellulose tow, which is free of plasticizing substances, are improved, thereby ensuring excellent quality stability.

[0023] FIG. 1 is a diagram showing the schematic configuration of a smoking article according to one embodiment of the present invention.

[0024] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the attached drawings. The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the attached drawings. However, the technical concept of the present disclosure is not limited to the following embodiments but can be implemented in various different forms. The following embodiments are provided merely to complete the technical concept of the present disclosure and to fully inform those skilled in the art of the scope of the present disclosure, and the technical concept of the present disclosure is defined only by the scope of the claims.

[0025] It should be noted that when assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions could obscure the essence of the present disclosure, such detailed description is omitted.

[0026] Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which this disclosure pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. The terms used herein are for describing the embodiments and are not intended to limit this disclosure. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text.

[0027] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used to describe the components of the present disclosure. These terms are intended only to distinguish the components from other components and do not limit the nature, order, or sequence of the components. Where it is stated that a component is "connected," "coupled," or "joined" to another component, it should be understood that the component may be directly connected or joined to the other component, but that another component may also be "connected," "coupled," or "joined" between each component.

[0028] As used in this disclosure, “comprise; include,” “comprising; including,” “contain,” “containing,” “have,” and / or “having” do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0029] Furthermore, unless explicitly specified otherwise, "or" means inclusive "or" and not exclusive "or".

[0030] For example, "condition A or B" is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).

[0031] The use of the terms "at least one" or "one or more" should be understood to include not only one but all quantities of two or more. Furthermore, the use of the phrase "at least one of X, Y, and Z" should be understood to include X alone, Y alone, Z alone, as well as any combination of X, Y, and Z.

[0032] Any reference to “one embodiment” or “embodiment” as used herein means that a specific element, feature, structure, or characteristic described in relation to such embodiment is included in at least one embodiment. The phrase “in one embodiment” appearing in various places in this specification does not necessarily refer to the same embodiment.

[0033] First, we will clarify some terms used in this specification.

[0034] In this specification, the term "smoking article" may mean any product capable of smoking or any product capable of providing a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, a smoking article may include products capable of smoking, such as cigarettes, cigars, and cigarillos.

[0035] In this specification, "smoking material" may mean any type of material that can be used in a smoking article.

[0036] In this specification, "upstream" or "upstream direction" means a direction away from the smoker's bulb, and "downstream" or "downstream direction" may mean a direction toward the smoker's bulb.

[0037] In this specification, "longitudinal direction" may mean a direction corresponding to the longitudinal axis of the smoking article.

[0038] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0039] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the attached drawings. The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the attached drawings. However, the technical concept of the present disclosure is not limited to the following embodiments but can be implemented in various different forms. The following embodiments are provided merely to complete the technical concept of the present disclosure and to fully inform those skilled in the art of the scope of the present disclosure, and the technical concept of the present disclosure is defined only by the scope of the claims.

[0040] It should be noted that when assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions could obscure the essence of the present disclosure, such detailed description is omitted.

[0041] Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which this disclosure pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. The terms used herein are for describing the embodiments and are not intended to limit this disclosure. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text.

[0042] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used to describe the components of the present disclosure. These terms are intended only to distinguish the components from other components and do not limit the nature, order, or sequence of the components. Where it is stated that a component is "connected," "coupled," or "joined" to another component, it should be understood that the component may be directly connected or joined to the other component, but that another component may also be "connected," "coupled," or "joined" between each component.

[0043] The terms “comprises,” “comprising,” “contain,” “containing,” “include,” “including,” “have,” and / or “having” as used in this disclosure do not exclude the presence or addition of one or more other components, steps, actions, and / or elements other than those mentioned.

[0044] Furthermore, unless explicitly stated otherwise, “or” means “or” in an inclusive sense, not in an exclusive sense. For example, condition A or B is satisfied in any one of the following cases: when A is true (or exists) and B is false (or does not exist); when A is false (or does not exist) and B is true (or exists); or when both A and B are true (or exist).

[0045] The use of the terms “at least one” or “one or more” is understood to include not only one but also any quantity exceeding one. Furthermore, the use of the phrase “at least one of X, Y, and Z” is understood to include not only cases involving only X, only Y, or only Z, but also any combination of X, Y, and Z.

[0046] References to “one embodiment” or “an embodiment” as used herein mean that a specific element, feature, structure, or characteristic described in relation to such embodiment is included in at least one embodiment. Furthermore, the expression “in one embodiment” as used in various parts of the specification does not necessarily refer to the same embodiment.

[0047] First, we will clarify some terms used in this specification.

[0048] In this specification, the term "smoking article" may mean any product capable of smoking or any product capable of providing a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, a smoking article may include products capable of smoking, such as cigarettes, cigars, and cigarillos.

[0049] In this specification, "smoking material" may mean any type of material that can be used in a smoking article.

[0050] In this specification, "upstream" or "upstream direction" means a direction away from the smoker's bulb, and "downstream" or "downstream direction" may mean a direction closer to the smoker's bulb.

[0051] In this specification, "longitudinal direction" may mean a direction corresponding to the longitudinal axis of the smoking article.

[0052] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0053] In this specification, "smoking material" may mean any type of material that can be used in a smoking article.

[0054] In this specification, the term “user” may be used interchangeably with “consumer” or “smoker.”

[0055] In this specification, "upstream" or "upstream direction" means a direction away from the smoker's bulb, and "downstream" or "downstream direction" may mean a direction toward the smoker's bulb.

[0056] In this specification, "longitudinal direction" may mean a direction corresponding to the longitudinal axis of the smoking article. The “longitudinal axis” of the smoking article may mean an imaginary line extending along the main longitudinal direction of the smoking article. This axis generally extends from one end of the smoking article (e.g., the end of the mouthpiece or filter) to the opposite end (e.g., the end of the combustion or heat source).

[0057] In this specification, “lyocell filter” refers to a filter comprising or composed of lyocell tow.

[0058] In this specification, “lyocell tow” comprises a plurality of lyocell fibers or is composed of a plurality of lyocell fibers. In some embodiments, a lyocell tow may refer to a bundle formed by cross-connecting adjacent lyocell fibers.

[0059] In this specification, “lyocell fiber” may mean a fiber made of lyocell cellulose. In particular, lyocell fiber may be a fiber made of cellulose derived from or mainly derived from wood pulp, in particular a regenerated cellulose fiber.

[0060] In this specification, “irregular cross-section” is defined as a cross-section whose shape is not circular but includes a plurality of protrusions. For example, a cross-section in which a plurality of protrusions branch and / or extend from a center and / or the center of the cross-section may be called an irregular cross-section. Here, “protrusion” may refer to a distinct and extended segment or arm extending outward from the central core or bonding point of the lyocell fiber cross-section.

[0061] In some embodiments, the lyocell fiber may have a Y-shaped cross section with three protrusions branching and / or extending from the center and / or the center of the cross section, a cross-shaped cross section with four protrusions, and / or a star-shaped cross section with five or more protrusions, and may have an O-shaped cross section, but is not limited thereto.

[0062] In some embodiments, the lyocell fiber may include three or more protrusions branching and / or extending from the center and / or the center of the cross section.

[0063] In some embodiments, the lyocell fibers included in the lyocell tow may have a Y-shaped cross-section for use in cigarette filters.

[0064] In this specification, "composed of" an element may mean being composed of said element.

[0065] In this specification, “wrapping” for a smoking article by a wrapper may refer to the wrapper surrounding at least a portion of the surface surrounding a longitudinal axis of each part (part), segment and / or structure of the smoking article.

[0066] In this specification, “basis weight” refers to the mass per unit area of ​​a roll and / or wrapper. The basis weight of a roll and / or wrapper may be determined by measuring the mass and area of ​​the roll and / or wrapper and dividing the mass of the roll and / or wrapper by the area. The unit of basis weight is gsm (gram per square meter), i.e., g / m² 2 It could be.

[0067] In this specification, “hard paper” refers to paper having a basis weight greater than a certain value.

[0068] In some embodiments, “general paper” may refer to paper that has not been treated with oil resistance on its surface, and “general hard paper” may refer to hard paper that has not been treated with oil resistance on its surface.

[0069] Filters for smoking products can capture at least some of the smoke components generated when smoking the smoking product.

[0070] In this specification, “suction resistance” refers to the static pressure difference between the two ends of a sample when an airflow crosses the sample. For example, suction resistance can be measured using the method specified in ISO standard 6565:2015. According to ISO standard 6565:2015, suction resistance may refer to the static pressure difference between the two ends of a sample when crossed by an airflow under normal conditions (22±2 °C, relative humidity 60±5%) where the volumetric flow rate at the discharge end is 17.5 mm per second.

[0071] In this specification, unless a separate physical quantity is indicated, component % and component ratio refer to the weight % of the component and the weight ratio of the component, respectively.

[0072] In this specification, the unit "mmH2O" means "mmWG" as a unit of pressure.

[0073] The filter of the smoking article can capture at least some of the smoke components generated when the smoking article is smoked. In some embodiments, the filter of the smoking article can capture at least some of the phenols contained in the smoke components generated when the smoking article is smoked.

[0074] In this specification, "filter hardness for smoking articles" is a numerical value representing the degree to which the diameter of a cigarette filter is maintained when the cigarette filter is pressed with a certain level of vertical force, and specifically, can be calculated by the following mathematical formula 1.

[0075] [Mathematical Formula 1]

[0076] Filter Hardness (%) for Smoking Products = [Da] / D × 100

[0077] Here, D represents the filter diameter (mm), and a represents the distance (mm) for the filter to descend (be pressed) by a 300g weight. The measurements required to calculate the hardness of the filter for the smoking product can be obtained using a device commonly used in the relevant technical field, such as a hardness measuring device; for example, Filtrona’s DHT 200™ may be used. In measuring the hardness, the applied force takes into account the force applied when an actual smoker grips a cigarette.

[0078] In this specification, “powdered activated carbon (or activated carbon powder)” refers to activated carbon composed of particles with a particle diameter of less than 0.18 mm. In this specification, “particle activated carbon (or activated carbon particles)” refers to activated carbon composed of particles with a particle diameter of 0.18 mm to 5 mm. The particle diameter can be measured by laser diffraction, and in particular, for particles with a diameter of less than 0.18 mm, it can be measured by laser diffraction. Additionally, the particle diameter can be measured by sieve analysis, and in particular, for particles with a diameter of 0.18 mm or more, it can be measured by sieve analysis.

[0079] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0080] FIG. 1 is a diagram showing the schematic configuration of a smoking article according to one embodiment of the present invention.

[0081] Throughout the specification, "smoking article" may refer to an article capable of generating an aerosol, such as tobacco (cigars), cigars, etc. A smoking article may include an aerosol-generating substance and / or an aerosol-forming substrate. Additionally, a smoking article may include a solid material based on tobacco raw materials, such as sheet tobacco, loose tobacco, or reconstituted tobacco. A smoking substance may include a volatile compound.

[0082] Referring to FIG. 1, a smoking article (100) includes a smoking material part (10) and a filter part (20). The smoking article (100) may further include a smoking material part wrapper (30a), a filter part wrapper (30b), and a tip paper (40). A filter for a smoking article according to the present invention may include a filter part (20) and a filter part wrapper (30b) surrounding the filter part (20). In the smoking article (100), the smoking material part (10) is located upstream of the filter part (20).

[0083] In some embodiments, the smoking material part (10) may be filled with a smoking material such as raw tobacco leaves, leaf tobacco, or a mixture of tobacco leaves and leaf tobacco. In some embodiments, the processed smoking material may be filled into the smoking material part (10) in the form of a sheet or a stick. In some embodiments, the smoking material part (10) may have a long, extended rod shape, and its length, circumference, and diameter are not specifically limited but may be adjusted to sizes generally used in the relevant technical field, taking into account the amount of smoking material filled, the user (consumer)'s preference, etc.

[0084] In some embodiments, the smoking material part (10) may include at least one aerosol generating material selected from glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. In some embodiments, the smoking material part (10) may contain other additive materials such as flavoring agents, humectants, and / or acetate compounds. In some embodiments, the aerosol generating material and / or additive materials may be contained in the smoking material.

[0085] In some embodiments, the smoking material part (10) may be wrapped by a smoking material part wrapper (30a). Some of the cigarette smoke generated during the combustion process of a typical smoking material part (10) is released into the atmosphere through the smoking material part wrapper (30a) before passing through the cigarette filter, and the sidestream smoke causes discomfort to secondhand smokers. Various attempts have been made to reduce this sidestream smoke by adding fillers such as magnesium oxide, titanium oxide, cerium oxide, aluminum oxide, calcium carbonate, and zirconium carbonate to conventional cigarette paper. However, simply applying these fillers to reduce sidestream smoke results in a decrease in smoking sensation, combustion failure, or reduced re-solidification, making it difficult to solve the aforementioned problems through an appropriate combination of materials in the filler. In order to reduce sidestream smoke and simultaneously prevent a decrease in smoky sensation, a decrease in refractory properties, and a decrease in combustion, a filler mixed with magnesium oxide (MgO) and / or magnesium hydroxide (Mg(OH)2) and calcium carbonate (CaCO3) may be applied to the smoking material wrapper (30a) according to one embodiment of the present invention.

[0086] In some embodiments, a filter for a smoking item may be positioned downstream of the smoking material section (10). The filter section (20) of the filter for a smoking item is positioned downstream of the smoking material section (10) and serves as a filter through which aerosol substances generated from the smoking material section (10) pass just before being inhaled by a user (consumer or smoker). The filter section (20) may be manufactured in various materials or shapes.

[0087] A filter for a smoking article according to one embodiment of the present invention may include a filter portion (20) and a filter portion wrapper (30b) surrounding the filter portion (20).

[0088] The filter unit (20) according to the present invention may include a regenerated cellulose tow comprising a plurality of regenerated cellulose-based fibers, activated carbon included inside the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow.

[0089] In some embodiments, the filter for a smoking article comprising the regenerated cellulose tow may replace all or part of the filter portion (20) of the existing smoking article, and if it replaces part, the filter material previously used may be used together. The existing filter material may be, for example, a cellulose acetate filter, a hollow tube filter, etc. In some embodiments, the filter portion (20) may be composed of regenerated cellulose tow.

[0090] In FIG. 1, the filter section (20) is shown as a mono filter consisting of a single filter, but is not limited thereto. In some embodiments, the filter section (20) may be provided as a dual filter or a triple filter having two or more filters to increase filter efficiency.

[0091] In some embodiments, the filter section (20) may include a dual filter comprising a first filter section and a second filter section disposed downstream of the first filter section. In this case, the filter section according to the present invention, comprising a plurality of regenerated cellulose fibers, activated carbon, and a binder, may be disposed between the smoking material section (10) and the second filter section. That is, by including activated carbon in the first filter section and not including activated carbon in the second filter section, it is possible to prevent the activated carbon from escaping into the user's mouth.

[0092] However, not limited thereto, if the filter section (20) is a dual filter comprising a first filter section and a second filter section disposed downstream of the first filter section, a filter for a smoking article according to the present invention may be applied, wherein at least one of the first filter section and the second filter section comprises regenerated cellulose tow, activated carbon, and a binder.

[0093] In some embodiments, when the filter section (20) is provided as a dual filter or a triple filter, one of the filters may be a filter comprising a regenerated cellulose tow containing the regenerated cellulose fiber of the present invention, activated carbon disposed inside the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow (hereinafter, activated carbon regenerated cellulose filter), and another of the filters may be a cellulose acetate filter and / or a paper filter. In this case, the length of the regenerated cellulose filter of the present invention may be 25% to 50% of the total length of the filter section (20).

[0094] In this specification, regenerated cellulose-based fibers may refer to cellulose-based fibers formed by processing naturally occurring cellulose-based materials.

[0095] In some embodiments, the regenerated cellulose-based fiber may include at least one of viscose fiber and lyocell fiber, and preferably, the regenerated cellulose-based fiber may be a lyocell fiber.

[0096] In one embodiment, the regenerated cellulose tow comprising a plurality of regenerated cellulose-based fibers or composed of a plurality of regenerated cellulose-based fibers may be a lyocell tow comprising a plurality of lyocell fibers or composed of a plurality of lyocell fibers.

[0097] In some embodiments, the lyocell tow may comprise only a plurality of lyocell fibers and may not include additional fibers other than said lyocell fibers. That is, in some embodiments, the lyocell tow may be composed of a plurality of lyocell fibers. Since the lyocell tow is composed solely of lyocell fibers, the biodegradability of a filter for a smoking article comprising a filter portion containing the lyocell tow may be excellent.

[0098] In the following description, regenerated cellulose-based fibers are lyocell fibers and regenerated cellulose tow is lyocell tow. However, this is not limited thereto, and regenerated cellulose-based fibers are not limited to any cellulose-based fibers that have not been chemically modified.

[0099] In some embodiments, the filter wrapper (30b) surrounds the filter (20) and can wrap the filter (20).

[0100] In some embodiments, the filter wrapper (30b) may include a roll of paper. The filter wrapper (30b) may include a regular roll of paper or a hard roll of paper.

[0101] In some embodiments, the filter wrapper (30b) may comprise a porous ordinary roll. In some embodiments, the filter wrapper (30b) may comprise a porous ordinary roll having a porosity of 20K to 50K, 22K to 46K, preferably 23K to 25K, or 34K to 36K, or 44K to 46K, more preferably 24K, 35K, or 45K. In some embodiments, the filter wrapper (30b) may comprise a porous ordinary roll having a porosity of 24K. A filter for a smoking article according to some embodiments of the present invention may have improved biodegradability by the filter wrapper (30b) comprising an oil-resistant ordinary roll or an ordinary roll that is not a hard roll.

[0102] However, the filter wrapper (30b) may include hard paper, but is not limited thereto. Hereinafter, in this specification, hard paper may refer to paper having a basis weight greater than or equal to a predetermined numerical range. In particular, hard paper may refer to paper having a basis weight of 40 gsm or more, preferably 50 gsm or more, more preferably 60 gsm or more, even more preferably 70 gsm or more, and even more preferably 75 gsm or more. General paper may refer to paper having a basis weight of less than 40 gsm, preferably 38 gsm or less, and more preferably 36 gsm or less.

[0103] Additionally, the filter wrapper (30b) may include a standard roll or a hard roll that has been treated with oil resistance, but is not limited thereto.

[0104] In some embodiments, the smoking material part (10) wrapped by the smoking material part wrapper (30a) and the filter part (20) wrapped by the filter part wrapper (30b) may be combined and wrapped by tip paper (40). The tip paper (40) may be wrapped around at least a portion of the smoking material part wrapper (30a) (e.g., a downstream portion) and the outer edge of the filter part wrapper (30b), as shown in FIG. 1. In other words, at least a portion of the smoking material part (10) and the filter part (20) may be further wrapped by tip paper (40) and physically combined.

[0105] According to some embodiments of the present invention, the tip paper (40) may be made of non-porous rolled paper that is not oil-resistant, but is not limited thereto. Additionally, the tip paper (40) may include a non-combustible material to prevent the filter portion (20) from burning, but is not limited thereto.

[0106]

[0107] Hereinafter, the filter portion (20) of a filter for a smoking article according to one embodiment of the present invention will be described in detail.

[0108] Embodiments according to the present invention relate to a filter for a smoking article (100) included therein, wherein the filter for a smoking article according to the present invention comprises a filter portion (20) comprising a lyocell tow containing lyocell fibers, activated carbon contained within the lyocell tow, and a binder dispersed in the lyocell tow. In some embodiments, the filter for a smoking article may further comprise a filter portion wrapper (30b) surrounding the filter portion (20).

[0109] In some embodiments, a plurality of activated carbons are disposed inside the lyocell tow, and the plurality of activated carbons (or activated carbons) may be uniformly dispersed and disposed along the longitudinal direction of the lyocell tow inside the lyocell tow. However, not limited thereto, in some embodiments, the plurality of activated carbons (or activated carbons) may be non-uniformly dispersed and disposed along the longitudinal direction of the lyocell tow inside the lyocell tow.

[0110] In some embodiments, activated carbon can be manufactured by carbonizing wood, bamboo, sawdust, coconut shells, lignin, lignite, peat, etc., followed by activation and purification. Activated carbon can be classified into powdered activated carbon and granular activated carbon depending on its form. In some embodiments, powdered activated carbon or granular activated carbon may be used.

[0111] In some embodiments, activated carbon can perform the function of absorbing gaseous components in mainstream smoke generated during smoking.

[0112] In some embodiments, the activated carbon may have a specific surface area capable of absorbing aerosols contained in mainstream smoke. The specific surface area of ​​the activated carbon may be 600 to 3000 m² / g. Preferably, the specific surface area of ​​the activated carbon may be 700 to 2500 m² / g. More preferably, the specific surface area of ​​the activated carbon may be 1000 to 2000 m² / g. However, the specific surface area of ​​the activated carbon is not necessarily limited to the above ranges, and the activated carbon may have any specific surface area sufficient to absorb aerosols from mainstream smoke. The specific surface area may be measured using the BET (Brunauer-Emmett-Teller) gas adsorption method according to ISO 9277 (2014-01).

[0113] In some embodiments, a plurality of activated carbons are disposed inside the lyocell tow, and the plurality of activated carbons may be included within the lyocell tow with respect to the longitudinal direction of the lyocell tow at concentrations of 0.5 mg / mm to 4 mg / mm, 0.6 mg / mm to 3.9 mg / mm, 0.7 mg / mm to 3.8 mg / mm, 0.8 mg / mm to 3.7 mg / mm, 0.9 mg / mm to 3.6 mg / mm, 1.0 mg / mm to 3.5 mg / mm, 1.1 mg / mm to 3.4 mg / mm, 1.2 mg / mm to 3.3 mg / mm, 1.3 mg / mm to 3.2 mg / mm, 1.4 mg / mm to 3.1 mg / mm, or 1.5 mg / mm to 3.0 mg / mm, and preferably 1.55 mg / mm to 2.9 mg / mm, 1.6 mg / mm to It may be included in 2.8 mg / mm, 1.65 mg / mm to 2.7 mg / mm, 1.7 mg / mm to 2.6 mg / mm, 1.75 mg / mm to 2.5 mg / mm, 1.8 mg / mm to 2.4 mg / mm, or 1.85 mg / mm to 2.3 mg / mm, more preferably 1.9 mg / mm to 2.25 mg / mm, 1.9 mg / mm to 2.2 mg / mm, or 1.9 mg / mm to 2.1 mg / mm, and even more preferably 2.0 mg / mm, but is not limited thereto.

[0114] In some embodiments, a plurality of activated carbons are disposed in the lyocell tow, specifically, the plurality of activated carbons can be settled in the space between the plurality of lyocell fibers constituting the lyocell tow. The activated carbons can be stably settled or fixed in the space between the plurality of lyocell fibers by the adhesive force of a binder dispersed on the plurality of lyocell fibers.

[0115] In some embodiments, the binder may be dispersed on the lyocell tow. In some embodiments, the binder may be uniformly dispersed over the entire area of ​​the lyocell tow and distributed over the entire area of ​​the lyocell tow constituting the filter portion (20).

[0116] In some embodiments, the binder is dispersed on the lyocell tow and does not act as a plasticizer for the lyocell fibers, but can perform the function of bonding the lyocell fibers constituting the lyocell tow. Accordingly, even though the binder is applied to the surface of the lyocell fibers, the lyocell tow with the dispersed binder has excellent biodegradability because the lyocell fibers are not plasticized by the binder, while the lyocell fibers are bonded by the binder, thereby imparting a certain level of hardness and a certain level of elasticity (or resilience).

[0117] In addition, the binder can be sprayed onto the lyocell tow before or simultaneously with the introduction of activated carbon during the manufacturing process of a filter for smoking products, thereby performing the function of preventing the activated carbon introduced onto the lyocell tow from escaping outside the lyocell tow.

[0118] In some embodiments, the binder may be included in the lyocell tow or uniformly dispersed on the surface of the lyocell fibers constituting the lyocell tow.

[0119] In some embodiments, the binder may include at least one of a cellulose-based binder, a starch-based binder, a dextrin-based binder, an ester-based binder, and an acrylic-based binder. Preferably, the binder may include a dextrin-based binder, and more preferably, the binder may include dextrin.

[0120] In some embodiments, the cellulose-based binder may comprise at least one of hydroxypropyl methylcellulose (HPMC), ethyl cellulose (EC), methyl cellulose (MC), and carboxymethyl cellulose (CMC). In some embodiments, the starch-based binder may comprise at least one of starch, cationic starch, and esterified starch. In some embodiments, the dextrin-based binder may comprise dextrin.

[0121] In some embodiments, the ester-based binder may include a polyester. In some embodiments, the polyester may have a weight-average molecular weight of 1,000 to 50,000, specifically 1,500 to 30,000, more specifically 2,000 to 10,000.

[0122] In some embodiments, the binder may include a dextrin-based binder. In some embodiments, the dextrin-based binder may refer to a binder based on dextrin or a derivative obtained by hydrolyzing starch, and may include at least one of a binder comprising dextrin or a dextrin derivative. Preferably, the binder may include dextrin.

[0123] In some embodiments, the amount or content of the binder may vary depending on the content of regenerated cellulose fibers in the filter for the smoking article, i.e., the content (or area) of lyocell fibers. In some embodiments, the amount of the binder added may be 0.5 wt% to 50 wt%, 1.0 wt% to 45 wt%, 1.5 wt% to 40 wt%, 2.0 wt% to 35 wt%, 2.5 wt% to 30 wt%, 3.0 wt% to 25 wt%, 3.5 wt% to 24 wt%, or 5 wt% to 20 wt% relative to the total weight of the lyocell tow containing lyocell fibers, preferably 6 wt% to 19 wt%, 7 wt% to 18 wt%, 8 wt% to 17 wt%, or 9 wt% to 16 wt% relative to the total weight of the lyocell tow containing lyocell fibers, and more preferably 10 wt% to 15 wt% relative to the total weight of the lyocell tow containing lyocell fibers. Within this numerical range, the detachment rate of activated carbon is minimized when manufacturing filters for smoking products, while simultaneously preventing the problem of the binder leaking from the lyocell tow to the wrapper and wetting the wrapper.

[0124] In some embodiments, the binder may be applied by spraying it onto the lyocell tow in the form of a binder solution. That is, the binder may be applied to the lyocell tow in the form of a binder solution prepared by mixing with a solvent. In some embodiments, the binder solution may further include a solvent along with the binder, and by spraying the binder solution prepared by mixing the binder and the solvent onto the lyocell tow, the lyocell tow can form a structure having a hardness of a certain level or higher.

[0125] In some embodiments, the binder is included in an amount of 5% to 40% by weight based on 100 parts by weight of the binder solution. Specifically, the content of the binder may be 5% or more by weight, 6% or more by weight, 7% or more by weight, 8% or more by weight, 9% or more by weight, 10% by weight, 15% by weight, or 20% or more by weight, and 40% or less by weight, 35% or less by weight, or 30% or less by weight, preferably 20% to 30% by weight. The binder is easy to apply to the lyocell tow by spraying when forming the binder solution within the above range, and the detachment rate of the activated carbon can be minimized.

[0126] In some embodiments, the solvent may include a polyhydric alcohol. Here, a polyhydric alcohol refers to a compound containing two or more hydroxyl groups. The polyhydric alcohol acts as a release agent when processing lyocell tow into a cigarette filter using a machine roll or similar device. Specifically, if lyocell tow is processed using a machine roll or similar device without a release agent, the lyocell tow may get tangled in the machine roll or similar device due to the adhesive force of the binder; however, lyocell tow containing a polyhydric alcohol can reduce this phenomenon and improve processability. Furthermore, when applied to lyocell tow, the polyhydric alcohol can perform an auxiliary function to improve the hardness of the lyocell tow quickly by positioning itself between the lyocell fibers along with the binder, even without drying at a particularly high temperature for a long time. Accordingly, when using a solvent containing a polyhydric alcohol, the drying time can be significantly shortened, thereby improving processability in the manufacture of filters for smoking products. The above polyhydric alcohol can be applied to lyocell tow in the form of a binder solution together with a binder and other solvents, and remains unchanged in the lyocell tow or the filter for smoking products to which it is applied even before and after drying, thereby imparting the aforementioned functionalities, such as improved hardness as well as manufacturing processability.

[0127] In some embodiments, the polyalcohol is a diol having a C1 to C4 alkylene group. In some embodiments, the diol refers to a compound having two hydroxyl groups, also referred to as a glycol. The two hydroxyl groups may be connected by a C1 to C4 alkylene group, wherein the carbon number of the alkylene group refers to the number of carbons directly connected between the two hydroxyl groups. In some embodiments, the alkylene group may exist in a substituted or unsubstituted state. In some embodiments, in the substituted state, the main chain of the alkylene group may be substituted with a substituent generally known in the art, such as a C1 to C3 alkyl group, a C1 to C3 alkoxy group, or a halogen group. In some embodiments, the polyalcohol may preferably comprise propylene glycol (PG). The propylene glycol (PG) may be a polyalcohol having a chain of suitable length and may be a more desirable compound for having the functionality described above.

[0128] In some embodiments, the polyhydric alcohol may be included in an amount of 5% to 50% by weight based on 100% by weight of the binder solution. Specifically, the content of the polyhydric alcohol may be 5% or more, 6% or more, 7% or more, 8% or more, 9% or more, 10% or more, 15% or more, 20% or more, or 25% or more based on 100% by weight of the binder solution, and may be 50% or less, 45% or less, 40% or less, or 35% or less based on 100% by weight of the binder solution, or 5% to 50% by weight, 10% to 45% by weight, 15% to 40% by weight, 20% to 40% by weight, or 25% to 35% by weight based on 100% by weight of the binder solution. When applied within the above range, the above polyalcohol can impart additional functionality to the cigarette filter without degrading the basic filter function of the lyocell tow.

[0129] In some embodiments, the polyhydric alcohol may be included in an amount of 0.5 to 30 parts by weight based on 100 parts by weight of lyocell tow, but is not limited thereto. When applied within the above range, the polyhydric alcohol can impart additional functionality to the filter for smoking articles without degrading the basic filter function of the lyocell tow.

[0130] In some embodiments, the solvent may additionally include a monohydric alcohol, which is methanol, ethanol, propanol, or a combination thereof, as an additional solvent to the polyhydric alcohol. In some embodiments, since the monohydric alcohol can replace water in the solvent of the binder solution, it not only helps improve the hardness of the filter for smoking articles but also exhibits additional functionality when applied to lyocell tow in that it has sterilizing power. In some embodiments, the monohydric alcohol may preferably include ethanol.

[0131] In some embodiments, the monohydric alcohol may be included in an amount of 5 to 60 parts by weight based on 100 parts by weight of the binder solution. Specifically, the content of the monohydric alcohol may be 1% or more by weight, 2% or more by weight, 3% or more by weight, or 4% or more based on 100% by weight of the binder solution, 10% or less by weight, 9% or less by weight, 8% or less by weight, 7% or less by weight, or 6% or less by weight, or 1% to 10% by weight, 2% to 8% by weight, 3% to 7% by weight, or 4% to 6% by weight.

[0132] In some embodiments, the monohydric alcohol is included in an amount of 1 to 500 parts by weight based on 10,000 parts by weight of lyocell tow. Since the monohydric alcohol is more volatile than polyhydric alcohol or water, the content of the monohydric alcohol is highly variable; however, in the content range, the lower limit is considered more meaningfully than the upper limit in this range, as, according to one embodiment of the present invention, when the drying process is reduced and the product is stored at room temperature, a certain level of monohydric alcohol can be detected compared to the case where no monohydric alcohol is added.

[0133] In some embodiments, the solvent may additionally include water as an additional solvent to the polyhydric alcohol. In some embodiments, the water is included in an amount of 5 to 60 parts by weight based on 100 parts by weight of the binder solution. Specifically, the water may be 10 to 55 wt%, 30 to 45 wt%, 35 to 45 wt%, 37 to 43 wt%, or 38 to 42 wt% based on 100 wt% of the binder solution.

[0134] In some embodiments, the binder may be mixed with a solvent comprising a polyhydric alcohol, a monohydric alcohol, and water and applied by spraying it onto a lyocell tow in the form of a binder solution. In some embodiments, the binder may be mixed with a solvent consisting of a polyhydric alcohol, a monohydric alcohol, and water.

[0135] In some embodiments, a lyocell filter containing activated carbon may have a hardness of 85% or more, and may have a hardness of 85% or more, 86% or more, 87% or more, 88% or more, 89% or more, 90% or more, 91% or more, 92% or more, 93% or more, or 94% or more, preferably 95% or more. The hardness of the filter for the smoking article is a numerical value representing the degree to which the diameter of the cigarette filter is maintained when the cigarette filter is pressed with a certain level of vertical force, and specifically, can be calculated by the following mathematical formula 2.

[0136] [Mathematical Formula 2]

[0137] Filter Hardness (%) for Smoking Products = [Da] / D × 100

[0138]

[0139] Here, D represents the filter diameter (mm), and a represents the distance (mm) for the filter to descend (be pressed) by a 300g weight. The measurements required to calculate the hardness of the filter for the smoking product can be obtained using a device commonly used in the relevant technical field, such as a hardness measuring device; for example, Filtrona’s DHT 200™ may be used. In measuring the hardness, the applied force takes into account the force applied when an actual smoker grips a cigarette. The hardness value of 85% or more obtained through the cigarette filter according to one embodiment of the present invention has technical significance in that it secures a level of hardness capable of replacing conventional cigarette filters composed of cellulose acetate by using lyocell tow, an eco-friendly material, and furthermore, preferably allows for the application of an excellent hardness of 95% or more.

[0140]

[0141] Hereinafter, the structure of the present invention and the resulting effects will be explained in more detail through examples and comparative examples. However, these examples are intended to explain the present invention more specifically, and the scope of the present invention is not limited to these examples.

[0142]

[0143] Comparative Example 1 (CA filter + activated carbon)

[0144] A filter rod for smoking products was manufactured by adding 2 mg / mm of activated carbon to a cellulose acetate tow with a circumference of approximately 24.2 mm and a length of 108 mm according to the conditions described in Comparative Example 1 of Table 1 below.

[0145]

[0146] Comparative Example 2 (CA filter + TEC + activated carbon)

[0147] A filter rod for smoking products was manufactured by adding TEC as a plasticizer at 10% by weight based on the total weight of the cellulose acetate tow, and adding activated carbon at 2 mg / mm according to the conditions described in Comparative Example 2 of Table 1 below.

[0148]

[0149] Comparative Example 3 (L-filter + activated carbon)

[0150] A filter rod for smoking products was manufactured by adding 2 mg / mm of activated carbon to a lyocell tow with a circumference of approximately 24.2 mm and a length of 108 mm according to the conditions described in Comparative Example 3 of Table 1 below.

[0151]

[0152] Comparative Example 4 (L-filter + functional additive + activated carbon)

[0153] A filter rod for smoking products was manufactured by adding a functional additive mixed with 95 wt% PEG600 and 5 wt% TEC to a lyocell tow with a circumference of about 24.2 mm and a length of 108 mm at 10 wt% based on the total weight of the lyocell tow, and adding activated carbon at 2 mg / mm according to the conditions described in Comparative Example 4 of Table 1 below.

[0154]

[0155] Example 1 (L-filter + binder 10 wt% + activated carbon)

[0156] A filter rod for smoking articles was manufactured by adding a binder solution, mixed with 25% by weight of dextrin, 30% by weight of PG as a solvent, 5% by weight of ethanol, and 40% by weight of water, to a lyocell tow with a circumference of about 24.2 mm and a length of 108 mm at 10% by weight based on the total weight of the lyocell tow according to the conditions described in Example 1 of Table 1 below, and adding activated carbon at 2 mg / mm.

[0157]

[0158] Classification Length (mm) Target Circumference (mm) Amount of Activated Carbon Added (mg / mm) Weight (mg) Suction Resistance (mmH2O) Circumference (mm) Comparative Example 1 (CA-Filter + Activated Carbon) 108 24.227 23.235 1.32 3.71 Comparative Example 2 (CA-Filter + TEC + Activated Carbon) 74 8.83 38.72 3.80 Comparative Example 3 (L-Filter + Activated Carbon) 86 6.73 55.22 3.73 Comparative Example 4 (L-Filter + Functional Additive + Activated Carbon) 92 7.63 66.42 3.77 Example 1 (L-Filter + Binder + Activated Carbon) 92 3.23 49.22 3.76

[0159]

[0160] Experimental Example 1: Analysis of Filter Hardness and Activated Carbon Detachment Rate According to Binder Application

[0161]

[0162] The hardness and recovery rate of the filter rods for smoking products according to Comparative Examples 1 to 4 and Example 1 were measured, and the filter rods for smoking products according to Comparative Examples 1 to 4 and Example 1 were placed on a sieve shaker and operated for 10 minutes to measure the weight of the activated carbon that fell out of the filter. The ratio of the weight of the fallen activated carbon to the weight of the activated carbon introduced was then calculated to determine the fallout rate, which is shown in Table 2 below.

[0163]

[0164] Classification Activated Carbon Detachment Rate (%) Hardness (%) Restoration Rate (%) Difference between Restoration Rate and Hardness (%) Comparative Example 1 (CA-Filter + Activated Carbon) 1.58 1.09 5.21 4.2 Comparative Example 2 (CA-Filter + TEC + Activated Carbon) 0.99 0.19 8.68 5 Comparative Example 3 (L-Filter + Activated Carbon) 1.98 8.29 7.69 5 Comparative Example 4 (L-Filter + Functional Additive + Activated Carbon) 1.78 8.49 6.98 5 Example 1 (L-Filter + Binder + Activated Carbon) 1.09 5.79 9.43 5

[0165]

[0166] Referring to Table 2, it can be seen that the detachment rate in Example 1, a lyocell filter rod with a binder added, is the lowest at 1.0% compared to Comparative Example 1 and Comparative Examples 3-4, and is particularly similar to the detachment rate (0.9%) of Comparative Example 2, a cellulose acetate filter rod with a plasticizer (TEC) added. This confirms that adding a binder has an excellent effect in preventing the detachment of activated carbon compared to lyocell filters with the same amount of functional additives.

[0167] In addition, regarding hardness and recovery rate, it can be confirmed that Comparative Example 3 has lower hardness compared to Comparative Examples 1-2, while Example 1 has higher hardness and recovery rate. Furthermore, when comparing Comparative Example 4, to which a functional additive is applied, with Comparative Example 3, to which no functional additive is applied, the hardness and recovery rate are similar, indicating that the addition of a simple liquid functional additive alone does not have a significant effect in terms of hardness, recovery rate, and activated carbon detachment. On the other hand, Example 1, to which a binder is applied, shows significantly superior hardness and recovery rate compared to Comparative Example 4, to which a functional additive is applied, and has the lowest difference between recovery rate and hardness; thus, it can be confirmed that the quality, hardness, and elasticity characteristics of the filter for smoking products to which activated carbon is applied are the best. In conclusion, since Example 1 has the lowest detachment rate and higher filter hardness and recovery rate compared to Comparative Examples 1 to 4, it can be confirmed that the quality of the filter for smoking products according to Example 1 is the best.

[0168]

[0169] Example 2 (L-filter + 5 wt% binder + activated carbon)

[0170] A filter rod for smoking articles identical to that of Example 1 was manufactured, except that a binder solution was added at 5% by weight based on the total weight of the lyocell tow.

[0171]

[0172] Example 3 (L-filter + binder 15 wt% + activated carbon)

[0173] A filter rod for smoking articles identical to Example 1 was manufactured, except that a binder solution was added at 15% by weight based on the total weight of the lyocell tow.

[0174]

[0175] Example 4 (L-filter + binder 20 wt% + activated carbon)

[0176] A filter rod for smoking articles identical to Example 1 was manufactured, except that a binder solution was added at 20% by weight based on the total weight of the lyocell tow.

[0177]

[0178] Experimental Example 2: Evaluation of Activated Carbon Detachment Rate According to Binder Addition Amount

[0179] Filter rods for smoking products according to Comparative Example 3 and Examples 1 to 4 were placed on a sieve shaker and operated for 10 minutes to measure the weight of the activated carbon that fell out of the filter. The ratio of the weight of the fallen activated carbon to the weight of the introduced activated carbon was then calculated to determine the fallout rate, which is shown in Table 3 below.

[0180]

[0181] Classification Binder Addition Amount (Wet%) Activated Carbon Detachment Rate (%) Comparative Example 3 0.9 Example 2 5.1.4 Example 1 10.1.0 Example 3 15.0.8 Example 4 20.0.4

[0182]

[0183] Referring to Table 3 above, it can be seen that the detachment rate of activated carbon decreases as the amount of binder added increases. Example 1 exhibits a detachment rate similar to that of activated carbon applied in conventional cellulose acetate filters, and it can be confirmed that an amount of binder added to realize the minimization of activated carbon detachment is preferably 5% by weight or more. Furthermore, it can be confirmed that if the amount of binder added exceeds 50% by weight, the ease of cutting the filter rod for smoking articles manufactured by the binder decreases, and problems such as leakage of the outer wrapper occur, so it is preferable to apply it at 50% by weight or less. Accordingly, in terms of ease of manufacturing the filter, filter quality, and activated carbon detachment rate, it can be confirmed that it is preferable to include 8% to 17% by weight, 9% to 16% by weight, and more preferably 10% to 15% by weight.

[0184]

[0185] Experimental Example 3: Evaluation of Iodine Adsorption Capacity of Activated Carbon with Application of Additives

[0186] A plurality of activated carbons introduced into filter rods for smoking articles according to Comparative Examples 2 to 4 and Example 1, each having a length of 108 mm, were collected, and the iodine adsorption capacity of the activated carbons included in Comparative Examples 2 to 4 and Example 1 was analyzed, and the results are shown in Table 4 below.

[0187]

[0188] Test Item Unit Experiment Method Comparative Example 3 Comparative Example 2 Comparative Example 4 Example 1 Iodine Adsorption Capacity mg / g KS M 1803-a1096873673920

[0189]

[0190] As shown in Table 4 above, compared to Comparative Example 3, in which activated carbon was added in the same amount and no functional additive, plasticizer, or binder was added, it can be confirmed that the iodine adsorption capacity of the activated carbon in Comparative Examples 2 and 4 is reduced by the plasticizer or functional additive added to the tow. In the case of Example 1, it can be confirmed that the iodine adsorption capacity is 920 mg / g, which is higher than that of Comparative Examples 2 and 4, in which a plasticizer or functional additive is added. Accordingly, since similar iodine adsorption capacity can be achieved even when a binder is added compared to when no binder is added, it can be confirmed that a filter for smoking products with improved quality can be provided, which has excellent filter performance while simultaneously improving hardness due to adhesive strength.

[0191] Although embodiments of the present disclosure have been described above with reference to the attached drawings, those skilled in the art will understand that the present disclosure may be practiced in other specific forms without altering the technical concept or essential features thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of protection of the present disclosure shall be interpreted by the claims below, and all technical concepts within the equivalent scope shall be interpreted as being included within the scope of rights of the technical concepts defined by the present disclosure.

Claims

1. A filter portion comprising a regenerated cellulose tow containing regenerated cellulose-based fibers, activated carbon contained within the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow. Filter for smoking products.

2. In Paragraph 1, The above-mentioned regenerated cellulose-based fiber comprises at least one of viscose fiber or lyocell fiber, Filter for smoking products.

3. In Paragraph 1, The above-mentioned regenerated cellulose-based fiber includes lyocell fiber, and The above-mentioned regenerated cellulose tow is lyocell tow, Filter for smoking products.

4. In Paragraph 1, The above binder comprises a dextrin-based binder, Filter for smoking products.

5. In Paragraph 4, The above binder comprises dextrin, Filter for smoking products.

6. In Paragraph 1, The above binder is mixed with a solvent and applied in the form of a binder solution, and The above solvent comprises at least one of a monohydric alcohol, a polyhydric alcohol, and water, Filter for smoking products.

7. In Paragraph 1, The above activated carbon is applied to at least one of powdered activated carbon and granular activated carbon, Filter for smoking products.

8. In Paragraph 1, The above activated carbon is included in an amount of 0.5 mg / mm to 4 mg / mm based on the length of the above regenerated cellulose tow, Filter for smoking products.

9. In Paragraph 1, The above binder is included in an amount of 0.5% to 50% by weight based on the total weight of the regenerated cellulose tow, Filter for smoking products.

10. Smoking substance part; and It includes a filter for a smoking article disposed downstream of the above-mentioned smoking material part, The filter for the above-mentioned smoking product is, A filter portion comprising a regenerated cellulose tow containing regenerated cellulose-based fibers, activated carbon contained within the regenerated cellulose tow, and a binder dispersed in the regenerated cellulose tow; and including a filter wrapper surrounding the filter portion, Smoking items.

11. In Paragraph 10, The above binder comprises dextrin, Smoking items.

12. In Paragraph 10, The above-mentioned regenerated cellulose-based fiber includes lyocell fiber, and The above-mentioned regenerated cellulose tow is lyocell tow, and The above binder is included in an amount of 5% to 20% by weight based on the total weight of the lyocell tow, Smoking items.

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