Lyocell material, filter for smoking article, smoking article, and methods for manufacturing same

Abstract

The present application relates to: a lyocell material; a filter for a smoking article, comprising the lyocell material; and a smoking article. The lyocell material and the filter for a smoking article, according to the present application, can replace a conventional cellulose acetate material and a filter for a smoking article, comprising same.

Description

Lyocell material, filters for smoking articles, smoking articles and methods for manufacturing them

[0001] The present application relates to lyocell material, filters containing the same, smoking articles, and methods for manufacturing the same.

[0002] Until now, cellulose acetate fibers have been primarily used as cigarette filter materials. While cellulose acetate is known to be biodegradable, cellulose acetate-based smoking device filters retain their original form for one to two years after being buried in the soil, and complete biodegradation takes considerable time. Considering the amount of tobacco products collected and landfilled as waste after smoking, as well as the amount and toxicity of tobacco products discarded in the environment, there is a need to further improve the biodegradability of smoking device filters. Accordingly, lyocell, a more environmentally friendly material, has recently been chosen as a replacement for cellulose acetate.

[0003] One purpose of the present application is to provide a lyocell material that can replace commercially available cellulose acetate for use as a filter for smoking articles.

[0004] Another object of the present application is to provide a lyocell material for a smoking article filter, which is environmentally friendly in its manufacturing process and has excellent biodegradability when disposed of.

[0005] Another object of the present application is to provide a lyocell filter for smoking articles.

[0006] Another object of the present application is to provide a smoking article (e.g., a cigarette) comprising a lyocell filter.

[0007] According to the present application, a lyocell material, a filter including the same, a smoking article, etc. can be provided.

[0008] The above lyocell material may include one or more lyocell multifilaments.

[0009] The above lyocell multifilament may comprise one or more lyocell monofilaments.

[0010] According to one aspect of the present application, a lyocell material is provided, comprising crimped lyocell multifilaments, and having a crimp factor of 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch) calculated by the following equation 1.

[0011] [Formula 1]

[0012] Crimp factor = number of crimps * radians of crimps

[0013] In particular, in Equation 1, the radian of the crimp is calculated by Equation 1-1 below.

[0014] [Formula 1-1]

[0015] Crimp radians = arctan((length of crimp) / (2 * height of crimp))

[0016]

[0017] The crimped lyocell multifilament may comprise one or more lyocell monofilaments. The crimped lyocell multifilament may be considered a lyocell multifilament in the present application.

[0018] In some embodiments, a lyocell material may be provided having a crimp efficiency index, represented by Equation 2, of from 8.27 to 39.37 J·rad·ea / cm (21 to 100 J·rad·ea / inch).

[0019] [Formula 2]

[0020] Crimp Efficiency Index = Crimp Energy * Crimp Factor

[0021] In equation 2,

[0022] Crimp energy refers to the energy required to straighten the crimp, and the unit of crimp energy is J.

[0023] In some embodiments, a filter for a smoking article may be provided comprising a lyocell material having a crimp factor of from 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch).

[0024] In some embodiments, a filter for a smoking article may be provided comprising a lyocell material having a crimp efficiency index of from 8.27 to 39.37 J·rad·ea / cm (21 to 100 J·rad·ea / inch).

[0025] According to another aspect of the present application, a smoking article comprising the lyocell material or filter may be provided.

[0026] According to another aspect of the present application, a method for manufacturing the lyocell material, a filter comprising the same, and a smoking article may be provided.

[0027]

[0028] As used herein, "smoking article" may refer to an article capable of generating an aerosol, such as a cigarette or cigar. In this regard, the smoking article may include an aerosol-generating material or an aerosol-forming substrate. Furthermore, the smoking article may include a solid material based on tobacco raw materials, such as tobacco leaf, tobacco ash, or reconstituted tobacco. Additionally, the smoking material may include volatile compounds.

[0029] In the present specification, "Lyocell multifilament" may mean a multifilament made from lyocell cellulose. In particular, the lyocell multifilament may be a (multi)filament and / or fiber made from cellulose derived or primarily derived from wood pulp, in particular a semi-synthetic (multi)filament and / or fiber.

[0030] In this specification, “cellulose” may refer to “lyocell cellulose.”

[0031] As used herein, the term "crimp" may refer to a wave-like, curled or undulated configuration imparted to a material, such as a fiber, (mono)filament, multifilament and / or yarn, either inherently or through mechanical, thermal and / or chemical processes. Crimp may be characterized by a periodic deviation from a straight axis along the length of the fiber, (mono)filament, multifilament and / or yarn. One crimp in a fiber, (mono)filament, multifilament and / or yarn may be defined as one repeating unit of said periodic deviation. The presence of crimp influences properties of the material and fabrics made from the material, such as elasticity, bulk, resilience and texture.

[0032] In this specification, "crimp length" may refer to the dimension of one repeating unit described above that the crimp has in the linear axial direction along the length of the fiber, (mono)filament, multifilament and / or yarn.

[0033] In this specification, "crimp height" may refer to the periodic deviation that the crimp has from a straight axis along the length of the fiber, (mono)filament, multifilament and / or yarn.

[0034] In this specification, "crimp length / (2*crimp height)" may mean the ratio of the length of the base to the height of a right triangle, which is a right triangle having a base included in the straight axis of the crimp along the length of the fiber, (mono)filament, multifilament and / or yarn, the length of the base being 1 / 2 of the crimp length, and the height of the right triangle being the crimp height. This ratio may be used as a value representing the shape of the crimp. On the other hand, this ratio may mean the tangent (tan) function value for the opposite angle of the base in the right triangle.

[0035] In this specification, the crimp radian, expressed as arctan(crimp length / (2*crimp height)), may mean the size of the diagonal of the base, expressed in radians, in the right triangle. Therefore, the crimp radian may be used as a value representing the shape of the crimp. For example, the larger the crimp radian, which is the size of the diagonal of the base, the smaller the deviation from the longitudinal axis compared to the longitudinal dimension of one repeating unit of the crimp, or in other words, the less protruded the shape may be. Conversely, the smaller the crimp radian, the larger the deviation from the longitudinal axis compared to the longitudinal dimension of one repeating unit of the crimp, or in other words, the more protruded the shape may be. Here, the smaller the degree of protrusion, the more stably the shape can be maintained.

[0036] Meanwhile, in the ideal case where there is no overlap of crimps, the number of crimps may be inversely proportional to the longitudinal dimension of the repeating unit of the crimp. Therefore, if the crimp radian is the same, as the number of crimps increases, the longitudinal dimension of the repeating unit may decrease, and thus the height of the crimp may also decrease. On the other hand, if the number of crimps increases excessively, the properties of the crimped material may be degraded due to the excessive overlap of the crimps and / or between the crimps, and thus, post-processing may be limited.

[0037] Therefore, in the present specification, the crimp factor expressed as the product of the number of crimps and the crimp radian can be understood as a value indicating the number and shape of crimps in the crimped lyocell multifilament. The crimp factor can be expressed in units of, for example, rad·ea / cm. For example, if a repeating unit of a crimp is small and / or the number of crimps per unit length is large and / or crimps are formed that protrude relatively little from the longitudinal axis (i.e., the crimp radian is large), this can be expressed as an increase in the crimp factor.

[0038] As used herein, "crimp energy" means the energy required to straighten a crimp. Crimp energy may be expressed in units of energy (e.g., J).

[0039] For example, the crimp energy can be calculated from the minimum weight applied so that crimping is not observed in the lyocell multifilament. That is, the crimp energy can be calculated from the weight applied to the crimped lyocell multifilament. By applying a weight to one end of the crimped lyocell multifilament, the crimped lyocell multifilament is elongated. If a weight greater than the crimp energy is applied, the crimp is not observed in the lyocell multifilament. In this case, the crimp energy can be calculated from the product of the minimum weight applied so that crimping is not observed in the lyocell multifilament and the length to which the lyocell multifilament has been elongated up to that point.

[0040] A relatively high crimp energy can be evaluated as more evenly distributed crimps, i.e., higher uniformity.

[0041] Therefore, in this specification, the crimp efficiency index, which is expressed as the product of crimp energy and crimp factor, can be understood as a value indicating the distribution and shape (or shape) of the crimp. In other words, when the crimp factor is the same, the more uniformly the crimp is distributed, the higher the crimp efficiency index is. The crimp factor can be expressed in units of, for example, J·rad·ea / cm.

[0042] In this specification, the "swelling index" is calculated by multiplying the swelling factor by the number of crimps. The swelling factor is calculated by dividing the change in width of the fibers constituting the material (e.g., lyocell material) before and after permanent deformation (e.g., an opening process for lyocell material) by the change in length of the fibers before and after permanent deformation of the material, and the unit is %.

[0043] Therefore, in this specification, the "swelling index" may refer to the amount (i.e., the degree to which the material, etc., is swelled) of the degree (ratio) of increased width relative to the length reduction due to crimping of the material. Accordingly, the swelling index may be an indicator of the change in specific surface area due to crimping, and for example, a low swelling index may indicate a small specific surface area. Accordingly, a lyocell material having a low swelling index may indicate that it is unsuitable for use in a filter for a smoking article due to its small specific surface area. The swelling index may also indicate the uniformity of the crimp. For example, a high swelling index may indicate high crimp uniformity.

[0044] In this specification, “moisture content” may mean a value expressed as a weight % of the ratio of moisture contained in a sample based on 100 weight % of a sample not containing moisture, and may be a value calculated according to the following equation 3.

[0045] [Formula 3]

[0046] Moisture content (%) = ((WD) / D) * 100

[0047] In Equation 3, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0048] As used herein, the term "degree of polymerization" (DPw) may refer to the number of monomer units and / or repeating units in a macromolecule, polymer, or oligomer molecule. The degree of polymerization may be expressed as Mn / M0, where Mn is the number-average molecular weight of the macromolecule, polymer, or oligomer molecule, and M0 is the molecular weight of the monomer or repeating unit.

[0049] As used herein, "lyocell tow" comprises or consists of at least one lyocell multifilament.

[0050] As used herein, "bloomed" lyocell material, fibers and / or multifilaments refers to lyocell material and / or lyocell fibers and / or lyocell multifilaments that have been separated, uncoiled, unspooled, loosened or unwrapped from their original compressed and / or rolled state.

[0051] As used herein, "non-circular cross-section" may refer to a cross-sectional shape that deviates from the standard circular shape. The non-circular cross-section may include three or more protrusions, and preferably three protrusions. Here, "protrusions" may mean distinct, extended segments or arms extending outward from a central core or junction point of the monofilament cross-section. For example, the cross-sectional shape may have a Y-shaped cross-section, a rectangular cross-section, a star-shaped cross-section, a leaf-shaped cross-section, a hexagonal cross-section, a polygonal cross-section, etc. A non-circular cross-section that includes three protrusions may be referred to as a "Y-shaped cross-section." Lyocell tow may have a Y-shaped cross-section in terms of its application to cigarette filters.

[0052] In this specification, "the single fineness of the lyocell multifilament" means the fineness of one single monofilament separated from the lyocell multifilament. In this specification, "the single fineness of the filament" is considered as "the single fineness of the lyocell multifilament."

[0053] As used herein, "basis weight" refers to the mass per unit area of ​​the paper and / or wrapper. The basis weight of the paper and / or wrapper can be determined by measuring the mass and area of ​​the paper and / or wrapper and dividing the mass of the paper and / or wrapper by the area.

[0054] Unless otherwise specifically defined in this specification, the content % of an ingredient may be weight %.

[0055] Unless otherwise specifically defined herein, if the properties of lyocell materials, filters for smoking articles, and their related components or compositions are affected by temperature, the temperature at which the properties are determined or measured may be room temperature. In this case, room temperature refers to a temperature in a non-thermally or non-heated state, and may be, for example, a temperature of 10 to 35°C, particularly 15 to 35°C, 20 to 30°C, or about 25°C.

[0056] Hereinafter, the present invention will be described in more detail.

[0057]

[0058] The present application relates to a lyocell material. The lyocell material can be used in smoking articles, and, without particular limitation, the lyocell material can be used in a filter for smoking articles.

[0059]

[0060] According to one aspect of the present application, a lyocell material is provided, comprising crimped lyocell multifilaments, and having a crimp factor of 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch) calculated by the following equation 1.

[0061] [Formula 1]

[0062] Crimp factor = number of crimps * radians of crimps

[0063] In particular, in Equation 1, the radian of the crimp is calculated by Equation 1-1 below.

[0064] [Formula 1-1]

[0065] Crimp radians = arctan((length of crimp) / (2 * height of crimp))

[0066]

[0067] In some embodiments, for the lyocell material, the crimp factor may be from 13.78 to 25.59 rad·ea / cm (35 to 65 rad·ea / inch).

[0068] In some embodiments, the number of crimps in the lyocell material may be from 3.94 ea / cm to 23.62 ea / cm (10 ea / inch to 60 ea / inch). Preferably, the number of crimps may be from 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch).

[0069] In some embodiments, for the lyocell material, the crimp radian may be from 1.02 to 1.50. Preferably, the crimp radian may be from 1.05 to 1.35.

[0070] In some embodiments, for the lyocell material, the crimp height may be from 0.01 mm to 0.10 mm. Preferably, the crimp height may be from 0.04 mm to 0.10 mm.

[0071] In some embodiments, for lyocell materials, the length of the crimp may be from 0.25 mm to 0.40 mm.

[0072] In some embodiments, for the lyocell material, the crimp radian may be from 1.02 to 1.50 and the crimp height may be from 0.01 mm to 0.10 mm.

[0073] In some embodiments, for the lyocell material, the crimp radian may be from 1.02 to 1.50 and the length of the crimp may be from 0.25 mm to 0.40 mm.

[0074] In some embodiments, the lyocell material may have a crimp efficiency index, as expressed by Equation 2 below, of from 8.27 to 39.37 J·rad·ea / cm (21 to 100 J·rad·ea / inch).

[0075] [Formula 2]

[0076] Crimp Efficiency Index = Crimp Energy * Crimp Factor

[0077] In equation 2,

[0078] Crimp energy refers to the energy required to straighten the crimp, and the unit of crimp energy is J.

[0079] In some embodiments, for the lyocell material, the crimp efficiency index may be from 9.06 to 27.56 J·rad·ea / cm (23 to 70 J·rad·ea / inch).

[0080] In some embodiments, for lyocell materials, the crimp energy may be between 0.9 J and 1.6 J.

[0081] In addition, the crimp energy can be calculated from the weight applied to the crimped lyocell multifilament. By applying a weight to one end of the crimped lyocell multifilament, the crimped lyocell multifilament is elongated. If a weight greater than the crimp energy is applied, crimp is not observed from the lyocell multifilament. In particular, the crimp energy can be calculated from the minimum weight applied so that crimp is not observed from the lyocell multifilament. The crimp energy can be calculated from the product of the minimum weight applied so that crimp is not observed from the lyocell multifilament and the length to which the lyocell multifilament has been elongated up to that point.

[0082] In some embodiments, for the lyocell material, the single fiber count of the lyocell multifilament may be from 1.67 to 8.89 dtex (1.5 to 8.0 denier).

[0083] In some embodiments, the lyocell material can have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0084] In some embodiments, the lyocell material satisfies the following [condition i] and may further satisfy one or more of the following [condition ii] and [condition iii].

[0085] [Condition i] The crimp efficiency index is 9.06 to 27.56 J·rad·ea / cm (23 to 70 J·rad·ea / inch).

[0086] [Condition ii] The number of crimps is 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch).

[0087] [Condition iii] Crimp radians are between 1.02 and 1.50.

[0088] In some embodiments, the lyocell material may satisfy all of the following [conditions i] to [conditions iii].

[0089] In some embodiments, the lyocell material satisfies the following [condition i] and may further satisfy one or more of the following [condition iv] and [condition v].

[0090] [Condition i] The crimp efficiency index is 9.06 to 27.56 J·rad·ea / cm (23 to 70 J·rad·ea / inch).

[0091] [Condition iv] The height of the crimp is 0.01 mm to 0.10 mm.

[0092] [Condition v] The length of the crimp is 0.25 mm to 0.40 mm.

[0093] In some embodiments, the lyocell material may satisfy all of the following [condition i], [condition iv], and [condition v].

[0094] In some embodiments, in the lyocell material, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0095] In some embodiments, in the lyocell material, the lyocell multifilaments comprise one or more monofilaments, and the monofilaments may all have a non-uniform cross-section.

[0096] In some embodiments, the lyocell material may be lyocell tow.

[0097] In some embodiments, the lyocell material may be a filter for a smoking article.

[0098] In some embodiments, the lyocell material may not be suitable for use in tycoons or garments.

[0099] Also, according to another aspect of the present application, a filter for a smoking article comprising any one of the lyocell materials is provided.

[0100] Also, according to another aspect of the present application, a smoking article is provided comprising any one of the filters for smoking articles.

[0101] In addition, according to another aspect of the present application, a method for producing a lyocell material is provided, comprising a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step. In some embodiments, the steps are performed in the order mentioned.

[0102] In some embodiments, in the method for manufacturing a lyocell material, the emulsion treatment step is performed using an emulsion solution having an emulsion concentration of 2% to 10% based on 100% of the total emulsion solution, the temperature of the emulsion solution is 20°C to 80°C, and the moisture content of the lyocell multifilament can be adjusted before the crimping step.

[0103] In some embodiments, in the method for manufacturing lyocell material, the moisture content of the lyocell multifilament can be controlled from 180% to 360%.

[0104] In some embodiments, in a method of manufacturing a lyocell material, the moisture content of the lyocell multifilament may be reduced prior to the crimping step.

[0105] In some embodiments, in a method for manufacturing a lyocell material, the moisture content of the lyocell multifilament may be reduced during the crimping step.

[0106] In some embodiments, in the method for manufacturing a lyocell material, steam may not be used prior to the crimping step, during the crimping step, or prior to and during the crimping step.

[0107]

[0108] The uniformity of the crimp shape can be a key factor in improving the properties of lyocell materials, particularly the properties and manufacturing process of lyocell-based filters for smoking articles. Specifically, if the crimp shape imparted to lyocell multifilament is uneven, blooming due to fiber opening may be reduced during the processing of lyocell materials for use in the manufacture of smoking article filters, or post-processing, including fiber opening, may not be possible.

[0109] Meanwhile, due to the crimp imparted to the lyocell multifilament, permanent changes in the lyocell material manifest in the form of swelling. For example, due to the opening and / or elongation of the lyocell material, the lyocell material swells in the widthwise and lengthwise directions, and this swelling of the lyocell material is irreversible. Due to the irreversible swelling, the specific surface area of ​​the lyocell material rapidly increases, and the lyocell material finally acquires properties (e.g., filterability) suitable for use in filters for smoking articles.

[0110] Meanwhile, in the crimping step, the lyocell multifilament is crimped by applying pressure in a specific direction. Typically, if the number of crimps is increased simply by increasing the pressure, the randomly formed crimps and / or excessive overlap between crimps may deteriorate the physical properties of the lyocell material, thereby limiting post-processing. Conversely, if the number of crimps is reduced simply by decreasing the pressure, the lyocell material may not sufficiently swell through opening, making it unsuitable for use as a filter for smoking articles.

[0111] That is, by improving the uniformity of the crimp shape, it becomes possible to manufacture a lyocell material with improved swelling, and due to the increased swelling, the characteristics (e.g., filterability) of a filter for a smoking article including the lyocell material can be improved. In addition, by improving the uniformity of the crimp shape, the opening of the lyocell material can proceed stably, and the fairness of the manufacturing process of the filter for a smoking article can be improved.

[0112] Surprisingly, the present applicant has confirmed that the uniformity of the crimp is improved when the number of crimps and the radian value of the crimp are adjusted together, and from this point of view, through in-depth research, a new formula for the number of crimps and the radian value of the crimp is derived with respect to the improvement of the uniformity of the crimp.

[0113] In some embodiments, the lyocell material according to the embodiment has a crimp factor of 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch), where the crimp factor is calculated by Equation 1 below.

[0114] [Formula 1] Crimp factor = number of crimps * radians of crimps

[0115] By controlling the crimp factor according to the above formula 1, the uniformity of the crimp imparted to the lyocell multifilament is increased, and in particular, the uniformity of the shape of the crimp is further increased. Furthermore, the mechanical properties of the lyocell multifilament can be improved, and the characteristics (e.g., filterability) of a filter for a smoking article including the lyocell multifilament can be improved.

[0116] By adjusting the crimp factor within the above numerical range, the uniformity of the crimp applied to the lyocell multifilament is improved. In particular, by adjusting the crimp factor within the above numerical range, the number of crimps, the radian of the crimps, or both the number of crimps and the radian of the crimps are adjusted. On the one hand, the crimp factor can be adjusted by adjusting the number of crimps and / or the radian of the crimps. In particular, by adjusting the radian of the crimps, the height and length of the crimp applied to the lyocell multifilaments are directly adjusted. On the other hand, by adjusting the height and / or length of the crimps, the radian of the crimps can be directly adjusted. As a result, the shape of the crimp applied to the lyocell multifilaments is consistently controlled.

[0117] If the crimp factor is less than 9.84 rad·ea / cm (25 rad·ea / inch), the swelling index of the lyocell material may be significantly low due to an insufficient number of crimps formed and / or an uneven crimp shape. In light of the definition of the swelling index, a low swelling index indicates a small specific surface area, making the lyocell material unsuitable for use in filters for smoking articles.

[0118] Conversely, when the crimp factor exceeds 29.53 rad·ea / cm (75 rad·ea / inch), the swelling of the lyocell material may be limited due to an excessive number of crimps and / or uneven crimp shapes. In particular, during the process of opening and / or stretching the lyocell material for use in the manufacture of filters for smoking articles, the lyocell material may break instead of swelling. As a result, the manufacture of filters for smoking articles may be limited.

[0119] Additionally, the lyocell material according to some embodiments may have a crimp efficiency index (CEI) of 8.27 to 39.37 J·rad·ea / cm (21 to 100 J·rad·ea / inch), and the crimp efficiency index may be calculated according to Equation 2 below.

[0120] [Formula 2] Crimp efficiency index = crimp energy * crimp factor

[0121] By controlling the crimp efficiency index within the above numerical range, the uniformity of the crimp imparted to the lyocell multifilament is increased. In particular, the uniformity of the crimp is further increased throughout the lyocell multifilament. By controlling the crimp energy, the crimp factor, or both the crimp energy and the crimp factor, the energy required to impart the crimp and / or the shape of the crimp can be controlled. As a result, the uniformity of the crimp of the monofilaments taken from the central portion (e.g., the central portion in the longitudinal direction) and the monofilaments taken from the ends of the lyocell multifilament can be improved.

[0122] If the crimp efficiency index is less than 8.27 J·rad·ea / cm (21 J·rad·ea / inch), the lyocell material may have a significantly low swelling index. According to the definition of the swelling index, a low swelling index indicates a low specific surface area, making the lyocell material unsuitable for use in filters for smoking articles.

[0123] Conversely, if the crimp efficiency index exceeds 31.50 J·rad·ea / cm (80 J·rad·ea / inch), the excessive crimp may limit the swelling of the lyocell material. In particular, during the process of opening and / or stretching the lyocell material for use in the manufacture of filters for smoking articles, the lyocell material may break instead of swelling. As a result, the manufacture of filters for smoking articles may be limited.

[0124] By adjusting the crimp efficiency index within the above numerical range, the uniformity of the crimp imparted to the lyocell multifilament is increased, and in particular, the uniformity of the crimp imparted to the ends of the lyocell multifilament is further increased. Furthermore, the processability of the lyocell multifilament can be improved, and the characteristics (e.g., filterability) and processability of a filter for a smoking article including the lyocell multifilament can be improved.

[0125]

[0126] [Irregular cross-section]

[0127] One or more of the lyocell monofilaments included in the lyocell material of the present application may have an irregular cross-section. "Irregular" means that the shape of the outer line of the cross-section is not circular, and the "cross-section" may be a cross-section obtained by cutting the lyocell monofilament virtually or actually perpendicular to the longitudinal direction of the filament.

[0128] The outline of the heteromorphic cross-section may be tangent to an imaginary first circle and an imaginary second circle, respectively. Furthermore, the imaginary second circle may be depicted within the imaginary first circle, and / or the imaginary second circle may be within the imaginary first circle. The "imaginary first circle" may also be referred to as an "imaginary circumcircle" and / or a "circumcircle," and / or the "imaginary second circle" may also be referred to as an "imaginary incircle" and / or an "incircle."

[0129] The virtual first circle may be the circle with the smallest area value among circles drawn to encompass one cross-section of the monofilament. The virtual second circle may be the circle with the largest area value among circles drawn within the cross-section of the monofilament.

[0130] If a circumscribed circle including the cross-section of the monofilament can be drawn, the virtual first circle can be said circumscribed circle. If an inscribed circle can be drawn inside the cross-section of the monofilament, the virtual second circle can be said inscribed circle.

[0131] The heterogeneous cross-section may have a shape including multiple protrusions, for example, a Y-shaped cross-section including three protrusions. It may be understood that the multiple protrusions are formed integrally with the imaginary second circle as the center, and that their ends are in contact with the imaginary first circle. The terms mentioned herein have the same meanings as those described above.

[0132] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0133] <Mathematical Formula 1>

[0134] Lee Hyung-do = r1 / r2

[0135] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0136] For example, the radius of the virtual first circle may be 4 to 40 μm, the radius of the virtual second circle may be 2 to 14 μm, and the degree of heterogeneity may be 1.01 to 10.

[0137] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0138] <Mathematical Formula 2>

[0139] Space occupancy = (S1 / S2) * 100(%)

[0140] Here, S1 is the area of ​​the imaginary first circle, and S2 is the cross-sectional area of ​​the monofilament contained in the lyocell fiber.

[0141] For example, the space occupancy of a monofilament having a heterogeneous cross-section can be 120 to 600%.

[0142] In some embodiments, in the lyocell material, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0143] In some embodiments, in the lyocell material, the lyocell multifilaments comprise one or more monofilaments, and the monofilaments may all have a non-uniform cross-section.

[0144]

[0145] [Island]

[0146] The lyocell material of the present application includes lyocell multifilament, and the lyocell multifilament can have a fineness suitable for manufacturing a filter for a smoking article and securing its function.

[0147] For example, the single filament fineness of the filaments forming the lyocell multifilament may be 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness refers to the fineness of one monofilament separated from the lyocell multifilament.

[0148] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., hardness or implementation of suction resistance) and fairness of the filter for smoking articles.

[0149] For example, the lyocell multifilament may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier). For example, the lower limit of the total fineness is, for example, 1,778 tex (16,000 denier) or more, 1,833 tex (16,500 denier) or more, 1,889 tex (17,000 denier) or more, 1,944 tex (17,500 denier) or more, 2,000 tex (18,000 denier) or more, 2,056 tex (18,500 denier) or more, 2,111 tex (19,000 denier) or more, 2,167 tex (19,500 denier) or more, 2,222 tex (20,000 denier) or more, 2,278 tex (20,500 denier) or more, 2,333 tex (21,000 denier) or more, 2,389 21,500 denier (tex) or more, 2,444 tex (22,000 denier) or more, 2,500 tex (22,500 denier) or more, 2,556 tex (23,000 denier) or more, 2,611 tex (23,500 denier) or more, 2,667 tex (24,000 denier) or more, 2,722 tex (24,500 denier) or more, 2,778 tex (25,000 denier) or more, 2,833 tex (25,500 denier) or more, 2,889 tex (26,000 denier) or more, 2,944 tex (26,500 denier) or more, 3,000 tex (27,000 denier) or more, 3,056 tex (27,500 denier) or more, 3,111 tex (28,000 denier) or more, 3,167 tex (28,500 denier) or more, 3,222 tex (29,000 denier) or more, 3,287 tex (29,500 denier) or more, 3,333 tex (30,000 denier) or more, 3,389 tex (30,500 denier) or more, 3,444 tex (31,000 denier) or more, 3,500 tex (31,500 denier) or more, 3,556 tex (32,000 denier) or more, 3,611 tex (32,500 denier) or more, 3,667 tex (33,000 denier) or more, 3,722 tex (33,500 denier) or more, 3,778 tex (34,000 denier) or more, 3,833 tex (34,500 denier) or more, 3,889 tex (35,000 denier) or more, 3,944 tex (35,500 denier) or more, 4,000 tex (36,000 denier) or more, 4,056 tex (36,500 denier) or more, 4,111 tex (37,000 denier) or more, 4,167 tex (37,500 denier) or more, 4,222 tex (38,000 denier) or more, 4,278 tex (38,500 denier) or more, 4,333 tex (39,000 denier) or more, 4,389 tex (39,500 denier) or more, 4,444 tex (40,000 denier) or more, 4,500 tex (40,500 denier) or more, 4,556 tex (41,000 denier) or more, 4,611 tex (41,500 denier) or more, 4,667 tex (42,000 denier) or more, 4,722 tex (42,500 denier) or more, 4,778 tex (43,000 denier) or more, 4,833 tex (43,500 denier) or more, 4,889 tex (44,000 denier) or more, 4,944 tex (44,500 denier) or more, 5,000 tex (45,000 denier) or more, 5,056 tex (45,500 denier) or more, 5,111 tex (46,000 denier) or more, 5,167 tex (46,500 denier) or more, 5,222 tex (47,000 denier) or more, 5,278 tex (47,500 denier) or more, 5,333 tex (48,000 denier) or more, 5,389 tex (48,500 denier) or more, 5,444 tex (49,000 denier) or more, 5,500 tex (49,500 denier) or more, 5,556 tex (50,000 denier) or more, 5,611 tex (50,500 denier) or more, 5,667 tex (51,000 denier) or more, 5,722 tex (51,500 denier) or more, 5,778 tex (52,000 denier) or more, 5,833 tex (52,500 denier) or more, 5,889 tex (53,000 denier) or more, 5,944 tex (53,500 denier) or more, 6,000 tex (54,000 denier) or more, or 6,056 tex (54,500 denier) or more. And, the upper limit is, for example, 6,056 tex (54,500 denier) or less, 6,000 tex (54,000 denier) or less, 5,944 tex (53,500 denier) or less, 5,889 tex (53,000 denier) or less, 5,833 tex (52,500 denier) or less, 5,778 tex (52,000 denier) or less, 5,722 tex (51,500 denier) or less, 5,667 tex (51,000 denier) or less, 5,611 tex (50,500 denier) or less, 5,556 tex (50,000 denier) or less, 5,500 tex (49,500 denier) or less, 5,444 tex (49,000 denier) or less, 5,389 tex (48,500 denier) or less, 5,333 tex (48,000 denier) or less, 5,278 tex (47,500 denier) or less, 5,222 tex (47,000 denier) or less, 5,167 tex (46,500 denier) or less, 5,111 tex (46,000 denier) or less, 5,056 tex (45,500 denier) or less, 5,000 tex (45,000 denier) or less, 4,944 tex (44,500 denier) or less, 4,889 tex (44,000 denier) or less, 4,833 tex (43,500 denier) or less, 4,778 tex (43,000 denier) or less, 4,722 tex (42,500 denier) or less, 4,667 tex (42,000 denier) or less, 4,611 tex (41,500 denier) or less, 4,556 tex (41,000 denier) or less, 4,500 tex (40,500 denier) or less, 4,444 tex (40,000 denier) or less, 4,389 tex (39,500 denier) or less, 4,333 tex (39,000 denier) or less,4,278 tex (38,500 denier) or less, 4,222 tex (38,000 denier) or less, 4,167 tex (37,500 denier) or less, 4,111 tex (37,000 denier) or less, 4,056 tex (36,500 denier) or less, 4,000 tex (36,000 denier) or less, 3,944 tex (35,500 denier) or less, 3,889 tex (35,000 denier) or less, 3,833 tex (34,500 denier) or less, 3,778 tex (34,000 denier) or less, 3,722 tex (33,500 denier) or less, 3,667 tex (33,000 denier) or less, 3,611 tex (32,500 denier) or less, 3,556 tex (32,000 denier) or less, 3,500 tex (31,500 denier) or less, 3,444 tex (31,000 denier) or less, 3,389 tex (30,500 denier) or less, 3,333 tex (30,000 denier) or less, 3,278 tex (29,500 denier) or less, 3,222 tex (29,000 denier) or less, 3,167 tex (28,500 denier) or less, 3,111 tex (28,000 denier) or less, 3,056 tex (27,500 denier) or less, 3,000 tex (27,000 denier) or less, 2,944 tex (26,500 denier) or less, 2,889 tex (26,000 denier) or less, 2,833 tex (25,500 denier) or less, 2,778 tex (25,000 denier) or less, 2,722 tex (24,500 denier) or less, 2,667 tex (24,000 denier) or less, 2,611 tex (23,500 denier) or less, 2,556 tex (23,000 denier) or less, 2,500 tex (22,500 denier) or less, 2,444 tex (22,000 denier) or less, 2,389 tex (21,500 denier) or less, 2,333 tex (21,000 denier) or less, 2,278 tex (20,500 denier) or less, 2,222 tex (20,000 denier) or less, 2,It may be 167 tex (19,500 denier) or less, 2,111 tex (19,000 denier) or less, 2,056 tex (18,500 denier) or less, 2,000 tex (18,000 denier) or less, 1,944 tex (17,500 denier) or less, 1,889 tex (17,000 denier) or less, 1,833 tex (16,500 denier) or less, 1,778 tex (16,000 denier) or less, or 1,722 tex (15,500 denier) or less. If the total fineness is outside the above range, the process for manufacturing a filter for smoking articles may not be good (continuous process is not possible due to cutting), and if the amount of tow filled in the filter paper during manufacturing of a filter for smoking articles is too small or too large, it may be difficult to secure sufficient filter properties (e.g., hardness or suction resistance, etc.).

[0150] The method for measuring fineness is not particularly limited, but for example, take a 2 m sample of the lyocell material to be measured, for example, lyocell tow, and leave it in a room that is kept at a constant temperature and humidity of 20℃ and 65% for 24 hours to stabilize. Fix one end of the stabilized lyocell tow, and attach a weight with a load of 2 kg to the other end. After maintaining (stabilizing) the tow in a state of being extended by the load for 5 seconds, cut it into 90 cm to obtain a sample, and measure the weight of the sample (total fineness). The fineness is converted into a denier scale according to the denier conversion method, and the measured weight is * 10000. If the total fineness of the sample is divided by the number of monofilament strands in the sample, the single fineness of the monofilament in the sample is calculated.

[0151] The total fineness of the lyocell multifilament as described above can be determined by the single fineness and crimp count of the filament. In the present application, the single fineness and crimp count can be controlled, and the total fineness of a lyocell material (e.g., lyocell tow) suitable for manufacturing a filter for a smoking article and ensuring its function can be secured.

[0152]

[0153] [Crimp]

[0154] In some embodiments, a lyocell material is provided comprising crimped lyocell multifilaments and having a crimp factor of 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch), calculated by Equation 1 below.

[0155] [Formula 1] Crimp factor = number of crimps * radians of crimps

[0156] By adjusting the crimp factor within the above numerical range, the uniformity of the crimp applied to the lyocell multifilament is improved. In particular, by adjusting the crimp factor within the above numerical range, the number of crimps, the radian of the crimp, or the number of crimps and the radian of the crimp are adjusted. In particular, by adjusting the radian of the crimp, the height and length of the crimp applied to the lyocell multifilament are directly adjusted. As a result, the shape of the crimp applied to the lyocell multifilament is consistently adjusted.

[0157] The lower limit of the crimp factor may be 11.81 rad·ea / cm(30 rad·ea / inch) or more, 13.78 rad·ea / cm(35 rad·ea / inch) or more, 15.75 rad·ea / cm(40 rad·ea / inch) or more, 17.72 rad·ea / cm(45 rad·ea / inch) or more, 19.69 rad·ea / cm(50 rad·ea / inch) or more, 21.65 rad·ea / cm(55 rad·ea / inch) or more, 23.62 rad·ea / cm(60 rad·ea / inch) or more, 25.59 rad·ea / cm(65 rad·ea / inch) or more, or 27.56 rad·ea / cm(70 rad·ea / inch) or more, and the upper limit of the crimp factor may be 27.56 It may be rad·ea / cm(70 rad·ea / inch) or less, 25.59 rad·ea / cm(65 rad·ea / inch) or less, 23.62 rad·ea / cm(60 rad·ea / inch) or less, 21.65 rad·ea / cm(55 rad·ea / inch) or less, 19.69 rad·ea / cm(50 rad·ea / inch) or less, 17.72 rad·ea / cm(45 rad·ea / inch) or less, 15.75 rad·ea / cm(40 rad·ea / inch) or less, 13.78 rad·ea / cm(35 rad·ea / inch) or less, or 11.81 rad·ea / cm(30 rad·ea / inch) or less.

[0158] In some embodiments, the crimp factor is from 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch), from 9.84 to 27.56 rad·ea / cm (25 to 70 rad·ea / inch), from 9.84 to 25.59 rad·ea / cm (25 to 65 rad·ea / inch), from 9.84 to 23.62 rad·ea / cm (25 to 60 rad·ea / inch), from 9.84 to 21.65 rad·ea / cm (25 to 55 rad·ea / inch), from 9.84 to 19.69 rad·ea / cm (25 to 50 rad·ea / inch), from 9.84 to 17.72 rad·ea / cm (25 to 45 rad·ea / inch), from 9.84 to 15.75 rad·ea / cm(25 to 40 rad·ea / inch), 9.84 to 13.78 rad·ea / cm(25 to 35 rad·ea / inch), 9.84 to 11.81 rad·ea / cm(25 to 30 rad·ea / inch), 11.81 to 29.53 rad·ea / cm(30 to 75 rad·ea / inch), 11.81 to 27.56 rad·ea / cm(30 to 70 rad·ea / inch), 11.81 to 25.59 rad·ea / cm(30 to 65 rad·ea / inch), 11.81 to 23.62 rad·ea / cm(30 to 60 rad·ea / inch), 11.81 to 21.65 rad·ea / cm(30 to 55 rad·ea / inch), 11.81 to 19.69 rad·ea / cm (30 to 50 rad·ea / inch), 11.81 to 17.72 rad·ea / cm (30 to 45 rad·ea / inch), 11.81 to 15.75 rad·ea / cm (30 to 40 rad·ea / inch), 11.81 to 13.78 rad·ea / cm (30 to 35 rad·ea / inch), 13.78 to 29.53 rad·ea / cm (35 to 75 rad·ea / inch), 13.78 to 27.56 rad·ea / cm(35 to 70 rad·ea / inch), 13.78 to 25.59 rad·ea / cm(35 to 65 rad·ea / inch), 13.78 to 23.62 rad·ea / cm(35 to 60 rad·ea / inch), 13.78 to 21.65 rad·ea / cm(35 to 55 rad·ea / inch), 13.78 to 19.69 rad·ea / cm(35 to 50 rad·ea / inch), 13.78 to 17.72 rad·ea / cm(35 to 45 rad·ea / inch), 13.78 to 15.75 rad·ea / cm(35 to 40 rad·ea / inch), 15.75 to 29.53 rad·ea / cm(40 to 75 rad·ea / inch), 15.75 to 27.56 rad·ea / cm (40 to 70 rad·ea / inch), 15.75 to 25.59 rad·ea / cm (40 to 65 rad·ea / inch), 15.75 to 23.62 rad·ea / cm (40 to 60 rad·ea / inch), 15.75 to 21.65 rad·ea / cm (40 to 55 rad·ea / inch), 15.75 to 19.69 rad·ea / cm (40 to 50 rad·ea / inch), 15.75 to 17.72 rad·ea / cm (40 to 45 rad·ea / inch), 17.72 to 29.53 rad·ea / cm (45 to 75 rad·ea / inch), 17.72 to 27.56 rad·ea / cm (45 to 70 rad·ea / inch), 17.72 to 25.59 rad·ea / cm (45 to 65 rad·ea / inch), 17.72 to 23.62 rad·ea / cm (45 to 60 rad·ea / inch), 17.72 to 21.65 rad·ea / cm (45 to 55 rad·ea / inch), 17.72 to 19.69 rad·ea / cm (45 to 50 rad·ea / inch), 19.69 to 29.53 rad·ea / cm (50 to 75 rad·ea / inch), 19.69 to 27.56 rad·ea / cm (50 to 70 rad·ea / inch), 19.69 to 25.59 rad·ea / cm (50 to 65 rad·ea / inch), 19.69 to 23.62 rad·ea / cm (50 to 60 rad·ea / inch), 19.69 to 21.65 rad·ea / cm (50 to 55 rad·ea / inch), 21.65 to 29.53 rad·ea / cm (55 to 75 rad·ea / inch), 21.65 to 27.56 rad·ea / cm (55 to 70 rad·ea / inch), 21.65 to 25.59 rad·ea / cm (55 to 65 rad·ea / inch), 21.65 to 23.62 rad·ea / cm (55 to 60 rad·ea / inch), 23.62 to 29.53 rad·ea / cm (60 to 75 rad·ea / inch), 23.62 to 27.56 rad·ea / cm (60 to 70 rad·ea / inch), 23.62 to 25.59 rad·ea / cm (60 to 65 rad·ea / inch), 25.59 to 29.53 rad·ea / cm (65 to 75 rad·ea / inch), 25.59 to 27.56 rad·ea / cm (65 to 70 rad·ea / inch), or 27.56 to 29.53 rad·ea / cm (70 to 75 rad·ea / inch).

[0159] If the crimp factor is less than 9.84 rad·ea / cm (25 rad·ea / inch), the swelling index of the lyocell material may be significantly low due to insufficient crimp formation and / or uneven crimp shape. In light of the definition of the swelling index, a low swelling index indicates a small specific surface area, making the lyocell material unsuitable for use in filters for smoking articles.

[0160] Conversely, when the crimp factor exceeds 29.53 rad·ea / cm (75 rad·ea / inch), the swelling of the lyocell material may be limited due to the non-uniformity of the crimp shape. In particular, during the process of opening and / or stretching the lyocell material for use in the manufacture of filters for smoking articles, the lyocell material may break instead of swelling. As a result, the manufacture of filters for smoking articles may be limited.

[0161] In some embodiments, for the lyocell material, the crimp radian may be between 1.02 and 1.50.

[0162] In some embodiments, the crimp radian is from 1.02 to 1.50, from 1.02 to 1.45, from 1.02 to 1.40, from 1.02 to 1.35, from 1.02 to 1.30, from 1.02 to 1.25, from 1.02 to 1.20, from 1.02 to 1.15, from 1.02 to 1.10, from 1.02 to 1.05, from 1.05 to 1.50, from 1.05 to 1.45, from 1.05 to 1.40, from 1.05 to 1.35, from 1.05 to 1.30, from 1.05 to 1.25, from 1.05 to 1.20, from 1.05 to 1.15, from 1.05 to 1.10, from 1.10 to 1.50, 1.10 to 1.45, 1.10 to 1.40, 1.10 to 1.35, 1.10 to 1.30, 1.10 to 1.25, 1.10 to 1.20, 1.10 to 1.15, 1.15 to 1.50, 1.15 to 1.45, 1.15 to 1.40, 1.15 to 1.35, 1.15 to 1.30, 1.15 to 1.25, 1.15 to 1.20, 1.20 to 1.50, 1.20 to 1.45, 1.20 to 1.40, 1.20 to 1.35, 1.20 to 1.30, 1.20 to 1.25, It may be 1.25 to 1.50, 1.25 to 1.45, 1.25 to 1.40, 1.25 to 1.35, 1.25 to 1.30, 1.30 to 1.50, 1.30 to 1.45, 1.30 to 1.40, 1.30 to 1.35, 1.35 to 1.50, 1.35 to 1.45, 1.35 to 1.40, 1.40 to 1.50, 1.40 to 1.45, or 1.45 to 1.50.

[0163] When the crimp radian is 1.01 or less, the swelling of the lyocell material due to the entanglement between the crimps may not occur sufficiently. In particular, the swelling index of the lyocell material may be less than 196.85 %·ea / cm (500 %·ea / inch). As a result, the swelling of the lyocell material may be insufficient, making it inappropriate to use the lyocell material as a filter material. For example, due to insufficient swelling of the lyocell material, the filtering ability of a filter including the lyocell material may be insufficient, and the lyocell material may be excessively filled in the filter in order to function as a filter.

[0164] In particular, in Equation 1, the radian of the crimp is calculated by Equation 1-1 below.

[0165] [Formula 1-1] Crimp radian = arctan((crimp length) / (2 * crimp height))

[0166]

[0167] In some embodiments, the crimp height of the lyocell material may be from 0.01 mm to 0.10 mm. Preferably, the crimp height may be from 0.02 mm to 0.10 mm, from 0.03 mm to 0.10 mm, from 0.04 mm to 0.10 mm, from 0.04 mm to 0.09 mm, from 0.04 mm to 0.08 mm, or from 0.04 mm to 0.07 mm. When the crimp height satisfies the above range, the swelling index of the lyocell material may be improved.

[0168] In some embodiments, for the lyocell material, the crimp length can be from 0.25 mm to 0.40 mm. For example, the lower limit of the crimp length can be 0.26 mm or more, 0.28 mm or more, 0.30 mm or more, 0.32 mm or more, 0.34 mm or more, 0.36 mm or more, or 0.38 mm or more, and the upper limit of the crimp length can be 0.38 mm or less, 0.36 mm or less, 0.34 mm or less, 0.32 mm or less, or 0.30 mm or less.

[0169] In some embodiments, the crimp radius of the lyocell material may be 1.02 to 1.50, and the crimp height may be 0.01 mm to 0.10 mm. By simultaneously satisfying the ranges of the crimp radius and the crimp height, the uniformity of the crimp imparted to the lyocell material may be further improved. The improved uniformity of the crimp may lead to an increase in the swelling index.

[0170] In some embodiments, the crimp radius of the lyocell material may be 1.02 to 1.50, and the crimp length may be 0.25 mm to 0.40 mm. By simultaneously satisfying the ranges of the crimp radius and the crimp length, the uniformity of the crimp imparted to the lyocell material may be further improved. The improved uniformity of the crimp may lead to an increase in the swelling index.

[0171] As a result, the uniformity of the crimp imparted to the lyocell multifilament is increased, and in particular, the uniformity of the shape of the crimp is further increased. Furthermore, the mechanical properties of the lyocell multifilament can be improved, and the characteristics (e.g., filterability) of a filter for a smoking article including the lyocell multifilament can be improved.

[0172] In some embodiments, the lyocell material may have a crimp efficiency index, as expressed by Equation 2 below, of from 8.27 to 39.37 J·rad·ea / cm (21 to 100 J·rad·ea / inch).

[0173] [Formula 2] Crimp efficiency index = crimp energy * crimp factor

[0174] In Equation 2, crimp energy refers to the energy required to straighten the crimp, and the unit of crimp energy is J.

[0175] In some embodiments, for the lyocell material, the lower limit of the crimp efficiency index is at least 9.06 J·rad·ea / cm (23 J·rad·ea / inch), at least 9.84 J·rad·ea / cm (25 J·rad·ea / inch), at least 11.81 J·rad·ea / cm (30 J·rad·ea / inch), at least 13.78 J·rad·ea / cm (35 J·rad·ea / inch), at least 15.75 J·rad·ea / cm (40 J·rad·ea / inch), at least 17.72 J·rad·ea / cm (45 J·rad·ea / inch), at least 19.69 J·rad·ea / cm (50 J·rad·ea / inch), at least 21.65 J·rad·ea / cm (55 J·rad·ea / inch), or at least 23.62 J·rad·ea / cm (60 J·rad·ea / inch). J·rad·ea / inch) or more, 25.59 J·rad·ea / cm(65 J·rad·ea / inch) or more, 27.56 J·rad·ea / cm(70 J·rad·ea / inch) or more, 29.53 J·rad·ea / cm(75 J·rad·ea / inch) or more, 31.50 J·rad·ea / cm(80 J·rad·ea / inch) or more, 33.46 J·rad·ea / cm(85 J·rad·ea / inch) or more, 35.43 J·rad·ea / cm(90 J·rad·ea / inch) or more, or 37.40 J·rad·ea / cm(95 J·rad·ea / inch) or more, and the upper limit of the crimp efficiency index is 37.40 J·rad·ea / cm(95 J·rad·ea / inch) or less, 35.43 J·rad·ea / cm(90 J·rad·ea / inch) or more. J·rad·ea / inch) or less, 33.46 J·rad·ea / cm(85 J·rad·ea / inch) or less, 31.50 J·rad·ea / cm(80 J·rad·ea / inch) or less, 29.53 J·rad·ea / cm(75 J·rad·ea / inch) or less, 27.56 J·rad·ea / cm(70 J·rad·ea / inch) or less, 25.59 J·rad·ea / cm(65 J·rad·ea / inch) or less, 23.It may be 62 J·rad·ea / cm(60 J·rad·ea / inch) or less, 21.65 J·rad·ea / cm(55 J·rad·ea / inch) or less, 19.69 J·rad·ea / cm(50 J·rad·ea / inch) or less, 17.72 J·rad·ea / cm(45 J·rad·ea / inch) or less, 15.75 J·rad·ea / cm(40 J·rad·ea / inch) or less, 13.78 J·rad·ea / cm(35 J·rad·ea / inch) or less, 11.81 J·rad·ea / cm(30 J·rad·ea / inch) or less, or 9.84 J·rad·ea / cm(25 J·rad·ea / inch) or less.

[0176] By controlling the crimp efficiency index within the above numerical range, the uniformity of the crimp imparted to the lyocell multifilament is increased. In particular, the uniformity of the crimp is further increased throughout the lyocell multifilament. By controlling the crimp energy, the crimp factor, or both the crimp energy and the crimp factor, the energy required to impart the crimp and / or the shape of the crimp can be controlled. As a result, the uniformity of the crimp of the monofilaments collected from the central portion and the terminal portion of the lyocell multifilament can be improved.

[0177] In some embodiments, for the lyocell material, the crimp energy may be from 0.9 J to 1.6 J. In particular, the crimp energy may be from 0.9 J to 1.6 J, from 1.0 J to 1.6 J, from 1.1 J to 1.6 J, from 1.2 J to 1.6 J, from 1.3 J to 1.6 J, from 1.4 J to 1.6 J, or from 1.5 J to 1.6 J, from 0.9 J to 1.5 J, from 0.9 J to 1.4 J, from 0.9 J to 1.3 J, from 0.9 J to 1.2 J, from 0.9 J to 1.1 J, or from 0.9 J to 1.0 J. By controlling the crimp energy within the above range, the uniformity of the crimp may be further increased, and the swelling index may be increased.

[0178] In addition, the crimp energy can be calculated from the weight applied to the crimped lyocell multifilament. By applying a weight to one end of the crimped lyocell multifilament, the crimped lyocell multifilament is elongated. If a weight greater than the crimp energy is applied, crimp is not observed from the lyocell multifilament. In particular, the crimp energy can be calculated from the minimum weight applied so that crimp is not observed from the lyocell multifilament. The crimp energy can be calculated from the product of the minimum weight applied so that crimp is not observed from the lyocell multifilament and the length to which the lyocell multifilament has been elongated up to that point.

[0179] If the crimp efficiency index is less than 8.27 J·rad·ea / cm (21 J·rad·ea / inch), the lyocell material may have a significantly low swelling index. According to the definition of the swelling index, a low swelling index indicates a low specific surface area, making the lyocell material unsuitable for use in filters for smoking articles.

[0180] Conversely, if the crimp efficiency index exceeds 31.50 J·rad·ea / cm (80 J·rad·ea / inch), the excessive crimp may limit the swelling of the lyocell material. In particular, during the process of opening and / or stretching the lyocell material for use in the manufacture of filters for smoking articles, the lyocell material may break instead of swelling. As a result, the manufacture of filters for smoking articles may be limited.

[0181] In some embodiments, the lyocell material satisfies the following [condition i] and may further satisfy one or more of the following [condition ii] and [condition v].

[0182] [Condition i] The crimp efficiency index is 9.06 to 27.56 J·rad·ea / cm (23 to 70 J·rad·ea / inch).

[0183] [Condition ii] The number of crimps is 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch).

[0184] [Condition iii] Crimp radians are between 1.02 and 1.50.

[0185] [Condition iv] The height of the crimp is 0.01 mm to 0.10 mm.

[0186] [Condition v] The length of the crimp is 0.25 mm to 0.40 mm.

[0187] As a result, the uniformity of the crimp imparted to the lyocell multifilament is increased, and in particular, the uniformity of the crimp imparted to the ends of the lyocell multifilament is further increased. Furthermore, the processability of the lyocell multifilament can be improved, and the characteristics (e.g., filterability) and processability of a filter for a smoking article including the lyocell multifilament can be improved.

[0188] In particular, in some embodiments, the lyocell material may satisfy the above [condition i] and further satisfy one or more of the above [condition ii] and [condition iii]. Alternatively, the lyocell material may satisfy the above [condition i] and further satisfy one or more of the above [condition iv] and [condition v].

[0189] For example, lyocell multifilament can have crimps of 3.94 to 23.62 per centimeter (10 to 60 per inch). For example, the number of crimps may be 5.91 ea / cm (15 ea / inch) or more, 7.87 ea / cm (20 ea / inch) or more, 9.84 ea / cm (25 ea / inch) or more, 11.81 ea / cm (30 ea / inch) or more, 13.78 ea / cm (35 ea / inch) or more, 15.75 ea / cm (40 ea / inch) or more, or 17.72 ea / cm (45 ea / inch) or more, and the upper limit may be, for example, 21.65 ea / cm (55 ea / inch) or less, 19.69 ea / cm (50 ea / inch) or less, 17.72 ea / cm (45 ea / inch) or less, 15.75 ea / cm (40 ea / inch) or less, 13.78 It may be ea / cm(35 ea / inch) or less, 11.81 ea / cm(30 ea / inch) or less, or 9.84 ea / cm(25 ea / inch) or less. The number of crimps and their uniformity can be controlled through pressure and temperature conditions, etc., related to the crimping step described below.

[0190] Although not particularly limited, the number of crimps can be measured, for example, using a single-fiber property evaluation device (e.g., Favimat). In particular, a manufactured lyocell material (preferably, lyocell tow) sample can be left and stabilized for 24 hours under conditions of a temperature of 20±2℃ and a humidity of 65±4%. A sample can be collected from the stabilized sample so that the crimp is not damaged. The sample can include part or all of the crimped lyocell multifilament. The collected sample can be mounted on a dedicated jig with a length (gauge length) of 10 to 30 mm. The initial load during measurement can be 0.44 cN / tex (0.05 g / de), and the crimp sensitivity can be 0.01 mm. The number of crimps can be measured under the conditions described above (i.e., a temperature of 20±2℃ and a humidity of 65±4%).

[0191] Although not specifically limited, lyocell materials manufactured to meet the single fiber count, total fiber count, crimp count, crimp factor, and / or crimp efficiency index described above may be used in smoking articles.

[0192]

[0193] [bookbinder]

[0194] In some embodiments, the lyocell material may further comprise a binder. The binder may be present, for example, on the surface of the lyocell multifilaments or between the lyocell multifilaments and / or monofilaments. The binder may increase the hardness of the filter for a smoking article, thereby preventing problems such as filter jamming during the filter manufacturing process or the manufacturing process of a smoking article (e.g., cigarette).

[0195] The type of binder available is not particularly limited, and any known binder may be used as long as it does not impede the purpose of the present invention. For example, a binder that provides sufficient compatibility with the emulsion used in the present application, improves the hardness of the filter, and provides excellent bonding strength may be used.

[0196] For example, the binder may include a polyester-based binder, a cellulose-based binder, and / or a vinyl-based binder.

[0197] Although not particularly limited, a polyester binder including at least one selected from the group consisting of alkylene, arylene, and heteroarylene having 5 to 12 carbon atoms may be used as the polyester binder.

[0198] Examples of cellulose-based binders that can be used include, but are not limited to, hydroxypropylmethylcellulose (HPMC), ethylcellulose (EC), and / or methylcellulose (MC), carboxymethylcellulose (CMC), etc.

[0199] In some embodiments, the cellulosic binder is selected from the group consisting of hydroxypropylmethylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and combinations thereof.

[0200] Examples of vinyl binders that can be used include, but are not limited to, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and / or ethylene vinyl acetate (EVAc).

[0201] In some embodiments, the vinyl binder is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and combinations thereof.

[0202] The method of applying the above binder to the lyocell material (e.g., coating) is described below.

[0203]

[0204] [emulsion]

[0205] The above lyocell material may include lyocell multifilaments; and an emulsion coated on the lyocell multifilaments. The emulsion may include (a) an ester of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol; and (b) an ester of sorbitan and a fatty acid having 16 or more carbon atoms. The emulsion may be applied to part or all of the monofilaments or multifilaments forming the lyocell material. In addition, the emulsion may penetrate between the filaments.

[0206] The emulsion comprising at least the above components (a) and (b) may have hydrophobic properties. As a result, the lyocell material treated with the emulsion may have excellent spreading properties.

[0207] In some embodiments, the lyocell material may contain a predetermined amount of the emulsion. In this case, the content of the emulsion may refer to OPU (wt%) described below. "OPU" may refer to "oil pick up ratio." For example, the lyocell material may contain the emulsion in an amount of 2 wt% or more based on 100 wt% of the total lyocell material. In particular, the content of the emulsion may be 2.5 wt% or more, 3.0 wt% or more, particularly 3.5 wt% or more, 4.0 wt% or more, 4.2 wt% or more, 4.5 wt% or more, 5.0 wt% or more, 5.5 wt% or more, 6.0 wt% or more, 6.5 wt% or more, 7.0 wt% or more, 7.5 wt% or more, 8.0 wt% or more, 8.5 wt% or more, 9.0 wt% or more, or 9.5 wt% or more. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less.

[0208] As a method for measuring the content (OPU) of the above-mentioned emulsion, an extrusion method can be used, for example. For example, a sample (e.g., 2 to 5 g, particularly about 2.5 g) is collected (the weight of the collected sample is referred to as the sample weight) and the sample is placed in a syringe-shaped container. The material of the container is not particularly limited, but may be SUS (stainless steel). Next, a solvent (e.g., methanol) is placed in the container into which the sample has been placed (the amount of the solvent placed may be 10 ml or less (e.g., about 8 ml)). The solvent may be placed in a dropping manner when the sample is placed, and the dropping speed is controlled uniformly. Then, the solvent placed in the container as described above is allowed to fall from one end of the syringe-shaped container onto a plate. At this time, the plate is pre-weighed (the weighed weight is referred to as plate weight A), and the plate is installed so that the solvent dropped on the plate can fly away (i.e., evaporate) at a temperature of 120 to 130°C (e.g., 125°C). The above-described solvent injection and solvent dropping are performed three times, and a pressure (e.g., 98 N / cm) is applied to the sample using a syringe-shaped container. 2 (10 kgf / cm 2 ) or less, 49 N / cm 2 (5 kgf / cm 2 ) or less or 18-39 N / cm 2 (2-4 kgf / cm 2 )) and press the sample once. This sufficiently extrudes the solvent and emulsion present in the sample. Squeeze the sample by applying pressure until no solvent comes out. Afterwards, store the plate in a desiccator for 5 to 10 minutes, and measure the weight of the plate containing the sample (plate weight B). Then, calculate the emulsion content according to the formula below.

[0209] Food

[0210] Content of emulsion by extrusion (OPU, % or wt%)

[0211] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0212] In addition, the lyocell material that serves as the basis for the above-described emulsion content may be at least an emulsion-treated lyocell multifilament. For example, the lyocell material may be a lyocell multifilament that has been subjected to a primary emulsion treatment (described below), a lyocell multifilament that has been subjected to a primary emulsion treatment and a secondary emulsion treatment (described below), or a lyocell multifilament that has been subjected to both the above-described emulsion treatment and a binder, as described below. In addition, the lyocell multifilament that has been subjected to an emulsion and / or binder treatment may be crimped.

[0213] In relation to the emulsion of the present application, component (a) is a compound that can function as a type of lubricant or oil, and may be a component harmless to the human body enough to be used in food. Component (a) provides lubrication to the fibers fed into the crimper. If the lubrication is insufficient, the lyocell may clump together and not be able to escape the crimper. If the lubrication is excessively high, crimping may not occur properly. The content of component (a) can be controlled, as described below, taking these functions into account.

[0214] With respect to the above component (a), the type of fatty acid having 16 or more carbon atoms that forms the esterified product is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an esterified product that is harmless to the human body and can be used in food can be used.

[0215] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0216] Saturated fatty acids include, for example, palmitic acid (hexadecanoic acid, CH3(CH2) 14 COOH), margaric acid (heptadecanoic acid, CH3(CH2)15 COOH), stearic acid (octadecanoic acid, CH3(CH2) 16 COOH), nonadecylic acid (nonadecanoic acid, CH3(CH2) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2) 18 Examples include COOH). However, the types of saturated fatty acids available are not limited to these.

[0217] Unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32 O2) etc. However, the types of unsaturated fatty acids that can be used are not limited to these.

[0218] The upper limit of the carbon number of the fatty acid having 16 or more carbon atoms is not particularly limited, but may be, for example, 40 or less, 36 or less, 32 or less, 28 or less, 24 or less, or 20 or less.

[0219] In some embodiments, the fatty acid is selected from the group consisting of palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid and arachidonic acid.

[0220] With respect to the above component (a), the type of aliphatic monohydric alcohol forming the ester compound is not particularly limited. Any aliphatic monohydric alcohol capable of providing an ester compound that is harmless to the human body and can be used in food may be used.

[0221] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and they can have a linear or branched form.

[0222] For example, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. In particular, the carbon number of the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0223] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0224] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol, and stearyl alcohol.

[0225] In a specific example of the present application, an ester of isotridecanol and stearic acid (e.g., isotridecyl stearate) may be used as the component (a). However, the type of component (a) that can be used is not limited thereto.

[0226] As described below, the content of the above-mentioned (a) component included in the emulsion can be adjusted in consideration of the function of the emulsion or the function of the (a) component.

[0227] The above (b) component, i.e., sorbitan and an ester of a fatty acid having 16 or more carbon atoms, is a compound that can function as a type of emulsifier and may be a component harmless to the human body enough to be used in food.

[0228] Since this component (b) has both hydrophilicity and hydrophobicity due to the polyhydric alcohol (i.e., sorbitan), it enables the component (a), which provides lubrication to the fiber, to be well dispersed in water as described below. In addition, components (a) and (b) used together not only increase the dispersibility of the emulsion as described above, but also lower the melting point, thereby ensuring the usability, handling, and stability of the emulsion. The content of the component (b) can be controlled as described below, taking these functions into consideration.

[0229] With respect to the above component (b), the type of fatty acid having 16 or more carbon atoms that forms the esterified product is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an esterified product that is harmless to the human body and can be used in food can be used.

[0230] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0231] Saturated fatty acids include, for example, palmitic acid (hexadecanoic acid, CH3(CH2) 14 COOH), margaric acid (heptadecanoic acid, CH3(CH2) 15 COOH), stearic acid (octadecanoic acid, CH3(CH2) 16 COOH), nonadecylic acid (nonadecanoic acid, CH3(CH2) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2) 18 Examples include COOH). However, the types of saturated fatty acids available are not limited to these.

[0232] Unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32O2) etc. However, the types of unsaturated fatty acids that can be used are not limited to these.

[0233] The upper limit of the carbon number of the fatty acid having 16 or more carbon atoms is not particularly limited, but may be, for example, 40 or less, 36 or less, 32 or less, 28 or less, 24 or less, or 20 or less.

[0234] In some embodiments, the fatty acid is selected from the group consisting of palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid and arachidonic acid.

[0235] In a specific example of the present application, the component (b) may be an ester of sorbitan and oleic acid (e.g., sorbitan monooleate). However, the types of usable component (b) are not limited thereto.

[0236] (b) The content of the component can be adjusted in consideration of the function of the component (b) and the function of the emulsion as described above.

[0237] For example, the emulsion may include 100 parts by weight of the esterified product of (a) a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) 20 to 60 parts by weight of the esterified product of (sorbitan) and a fatty acid having 16 or more carbon atoms.

[0238] In particular, the emulsion of the present application may contain the component (b) in an amount of 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, or 50 parts by weight or more, relative to 100 parts by weight of the component (a). In addition, the upper limit of the content of the component (b) relative to 100 parts by weight of the component (a) may be, for example, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, or 25 parts by weight or less. When the above content range is satisfied, the surface of the emulsion-treated lyocell multifilament or lyocell tow may have hydrophobicity.

[0239] For example, the emulsion may contain 40 to 80 wt% of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, based on 100 wt% of the total weight of the emulsion. In particular, the content of the component (a) may be 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, or 65 wt% or more, 70 wt% or more, or 75 wt% or more, based on 100 wt% of the total weight of the emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0240] For example, the emulsion may contain an excess amount of component (a).

[0241] For example, the emulsion may contain 15 to 55 wt% of (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, based on 100 wt% of the total weight of the emulsion. In particular, the content of the (b) component may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, based on 100 wt% of the total weight of the emulsion. And the upper limit of the content may be, for example, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, or 25 wt% or less.

[0242] For example, the emulsion may further contain water. A small amount of water may aid in emulsification. In this specification, the terms "emulsion-treated" and "emulsified" may be used interchangeably.

[0243] The content of water is not particularly limited, but may be included as the remaining amount after excluding the sum of the contents of components (a) and (b) from 100 wt% of the entire emulsion. The content of water included in the emulsion (i.e., the remaining amount after excluding the sum of the contents of the remaining components excluding water) may be, for example, 10 wt% or less, 9 wt% or less, 8 wt% or less, 7 wt% or less, 6 wt% or less, 5 wt% or less, 4 wt% or less, 3 wt% or less, 2 wt% or less, or 1 wt% or less. And, the lower limit may be, for example, 0 wt% or more, 0.1 wt% or more, 0.5 wt% or more, or 1 wt% or more.

[0244]

[0245] [Method for manufacturing lyocell material]

[0246] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0247] In particular, the method for manufacturing the lyocell material includes a lyocell dope spinning step; a coagulation and multifilament obtaining step; a washing step; an emulsion treatment step; and a crimping step. In addition, the method for manufacturing the lyocell material may further include a binder treatment step; and other steps.

[0248] The emulsion treatment step may be performed before the crimping step, after the crimping step, or before and after the crimping step.

[0249] The emulsion treatment can be performed independently, for example, by spraying the emulsion of the above-described composition onto the lyocell multifilament or immersing the lyocell multifilament in the emulsion. As described above, the emulsion treatment can be performed so that the content of the emulsion in the lyocell material (e.g., OPU (wt%)) satisfies a predetermined range.

[0250] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0251] A method for manufacturing a lyocell material according to a specific embodiment of the present application, including a milk treatment step and a crimping step, is described in more detail below. The method of the present application may be performed by including one or more of the steps described below.

[0252]

[0253] <(a) Lyocell dope radiation stage>

[0254] This step is a step of spinning a lyocell spinning dope containing lyocell cellulose (or lyocell cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0255] Commercially available cellulose acetate filters are identified as a major source of microplastics. However, the amine oxide solvents used in the production of lyocell fibers are recyclable and biodegrade upon disposal, and lyocell materials do not generate any pollutants during the production process. Furthermore, lyocell tow biodegrades and is removed within a relatively short period of time, making lyocell a more environmentally friendly material than cellulose acetate.

[0256] For example, the content of cellulose in the spinning dope may be 5 to 15 wt% based on 100 wt% of the total weight of the spinning dope. If the content of cellulose is too low, it may be difficult to implement the characteristics of the lyocell fiber, and if the content exceeds the above range, it may be difficult to dissolve in a solvent. Considering this, the content of cellulose in the spinning dope may be 6 wt% or more, 7 wt% or more, 8 wt% or more, 9 wt% or more, or 10 wt% or more, based on 100 wt% of the total weight of the spinning dope, and the upper limit thereof may be, for example, 14 wt% or less, 13 wt% or less, 12 wt% or less, 11 wt% or less, 10 wt% or less, or 9 wt% or less, based on 100 wt% of the total weight of the spinning dope.

[0257] For example, the above-mentioned radiation dope may include an N-methylmorpholine-N-oxide (NMMO) aqueous solution. The aqueous solution may include, for example, 80 to 95 parts by weight of N-methylmorpholine-N-oxide and 5 to 20 parts by weight of water, taking into account the degree of dissolution of cellulose and the process temperature.

[0258] For example, the cellulose or cellulose pulp may have an alpha-cellulose content of 85 to 97 wt% relative to 100 wt% of total cellulose and / or cellulose pulp.

[0259] For example, the cellulose or cellulose pulp may have a hemicellulose content of 1 wt% to 15 wt% relative to 100 wt% of the total cellulose and / or cellulose pulp. By adjusting the hemicellulose content within the above range, stable physical properties (e.g., hardness or suction resistance implementation) and processability of the lyocell material can be more easily secured.

[0260] Additionally, in some embodiments, the degree of polymerization (DPw) of the cellulose may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose and / or alpha-cellulose and / or hemicellulose within the cellulose pulp.

[0261] In the above-mentioned radiation step, the shape of the detention device for discharging the radiation dope is not particularly limited. For example, a donut-shaped radiation detention device may be used.

[0262] The nozzle temperature of the spinneret, particularly the spin temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the spinneret may vary depending on the spin temperature, which may impede ejection, the spin temperature may be, for example, between 100°C and 120°C or lower, or between 100°C and 110°C or lower.

[0263] For example, the step of spinning the above-described spinning dope can be performed under controlled spinning conditions so that the single filament fineness can be 1.67 dtex to 8.89 dtex (1.5 denier to 8.0 denier) or less. For example, one or more spinning conditions among the discharge amount and spinning speed of the above-described spinning dope can be appropriately controlled so that the single filament fineness included in the lyocell material can satisfy 1.67 dtex to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness means the fineness of one single monofilament separated from the multifilament.

[0264] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and ensuring fairness of a filter for smoking articles.

[0265] The radiation dope discharged through the radiation detention can go through the coagulation step described below.

[0266]

[0267] <(b) Coagulation and multifilament production step>

[0268] In this step, the radiated lyocell radiant dope is coagulated, and lyocell multifilament can be obtained.

[0269] The above coagulation may be carried out in a manner in which the radiant dope comes into contact with air and / or a coagulating liquid.

[0270] For example, the above coagulation may include a first coagulation step of supplying cooling air to the radiated lyocell dope; and a second coagulation step of introducing the first coagulated radiated dope into a coagulation solution to coagulate it.

[0271] According to the above-described solidification method, the lyocell dope discharged from the spinneret can be primarily solidified in the space (air gap section) between the spinneret and the solidification tank. For example, cooling air can be supplied from the inside of the spinneret to the outside of the spinneret from an air-cooling unit located inside the spinneret to the inside of the spinneret. Alternatively, primary solidification can be achieved by a so-called air quenching method or method known in the relevant field.

[0272] For example, the upper temperature limit of the cooling air used for primary coagulation may be 15°C or lower. In particular, the cooling air may be air having a temperature of 14°C or lower, 13°C or lower, 12°C or lower, 11°C or lower, or 10°C or lower. If the temperature exceeds the temperature, the coagulation of the radiation dope by the air may not be sufficient, and the radiation-related processability may not be good.

[0273] The lower limit of the cooling air temperature may be determined in consideration of the spinning processability and / or the cross-sectional uniformity of the filament. For example, if the temperature of the cooling air is below 4°C, the surface of the spinneret may cool, the surface of the filament may become uneven, and the spinning processability may also deteriorate. Considering this, the cooling air temperature may be 5°C or higher, 6°C or higher, 7°C or higher, 8°C or higher, or 9°C or higher.

[0274] The degree to which the cooling air is supplied can be controlled taking into account sufficient coagulation, spinning processability, and the influence on the physical properties of the filament. For example, 70 to 400 Nm per detention. 3 / h can be supplied to the radiation dope derived from the air volume. In particular, the air volume is 100 Nm 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or more or 250 Nm 3 / h or more, and the upper limit of the airflow is, for example, 350 Nm 3 / h or less, 300 Nm 3 / h or less, 250 Nm 3 / h or less, 200 Nm 3 / h or less or 150 Nm 3 / h can be less than or equal to.

[0275] After the first coagulation step as described above, the cooled spinning dope can be supplied to a coagulation tank or bath containing a coagulating solution (secondary coagulation step). For proper coagulation to proceed, the temperature of the coagulating solution can be, for example, 30°C or lower or 25°C or lower. Furthermore, the temperature of the coagulating solution can be 10°C or higher, 15°C or higher, or 20°C or higher. By maintaining the above temperature, the coagulation rate can be appropriately maintained.

[0276] The type of coagulant for the secondary coagulation described above is not particularly limited. For example, the coagulant may contain one or more of water and N-methylmorpholine-N-oxide (NMMO).

[0277] Although not particularly limited, when the coagulant contains water and NMMO, the water content in the coagulant may be 60 to 90 wt% and the NMMO content may be 10 to 40 wt% based on 100 wt% of the total coagulant. Alternatively, the coagulant may contain 70 to 80 wt% of water and 20 to 30 wt% of NMMO based on 100 wt% of the total coagulant. The concentration of the coagulant may be controlled to be maintained during the manufacturing process using a sensor or the like.

[0278]

[0279] <(c) Washing stage>

[0280] If necessary, the lyocell multifilaments may be washed after the coagulation and multifilament steps described above. This washing may remove any remaining NMMO and / or other impurities within the filaments.

[0281] There are no specific restrictions on the method of washing. For example, washing can be accomplished by introducing the coagulated lyocell multifilament into a washing tank using a traction roller. Alternatively, washing can be accomplished by spraying the washing solution as the traction roller moves the lyocell multifilament to the next stage.

[0282] The components of the washing liquid are not particularly limited. For example, the washing liquid may include water, and optionally, may further include one or more known additives.

[0283] In some embodiments, the washing liquid further comprises water and one or more known additives.

[0284] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0285]

[0286] <(d) Milk processing stage>

[0287] If necessary, a step of emulsifying the lyocell multifilament may be performed. This step involves applying an emulsion containing the aforementioned ingredients to the surface of the filament. This emulsion treatment reduces friction on the filament and facilitates crimp formation in the crimp application step described below. If the emulsion treatment is performed two or more times, as described below, the process may be referred to as a primary emulsion treatment or a secondary emulsion treatment, depending on the order of application.

[0288] Although not specifically limited, the emulsion treatment may be carried out by immersing the lyocell multifilaments in a bath filled with the emulsion so that the lyocell multifilaments are completely submerged in the emulsion. Alternatively, the emulsion may be treated on the lyocell multifilaments by spraying the emulsion liquid while being moved to the next step by a traction roller.

[0289] In order to ensure that the amount of emulsion applied to the lyocell multifilament after the emulsion treatment as described above is constant, an additional process may be performed in which a roll, etc., positioned before and / or after the emulsion treatment step squeezes out the emulsion from the surface of the lyocell multifilament.

[0290] For example, the emulsion treatment may be performed so that the emulsion content (OPU: oil pick up ratio (weight %)) satisfies 1.0 wt% or more based on at least 100 wt% of the emulsion-treated lyocell multifilament. At this time, the emulsion-treated lyocell multifilament may be, for example, a lyocell multifilament to which a primary emulsion treatment has been applied, a lyocell multifilament to which a primary emulsion treatment and a secondary emulsion treatment (see the description below) have been applied, or a lyocell multifilament to which a binder, which will be described later, has been applied together with the emulsion treatment as described above. In addition, the lyocell multifilament to which the emulsion and / or binder treatment as described above has been applied may have crimping.

[0291] In particular, the content of the emulsion in the at least emulsion-treated lyocell multifilament may be at least 0.5 wt%, at least 1.0 wt%, at least 1.5 wt%, at least 2.0 wt%, at least 2.5 wt%, at least 3.0 wt%, particularly at least 3.5 wt%, at least 4.0 wt%, at least 4.2 wt%, at least 4.5 wt%, at least 5.0 wt%, at least 5.5 wt%, at least 6.0 wt%, at least 6.5 wt%, at least 7.0 wt%, at least 7.5 wt%, at least 8.0 wt%, at least 8.5 wt%, at least 9.0 wt%, or at least 9.5 wt%, based on 100 wt% of the emulsion-treated lyocell multifilament. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on at least 100 wt% of the lyocell multifilament treated with the emulsion. At this time, the above content may mean the dry weight after the solvent (e.g., water) or liquid component that may be included in the emulsion has evaporated.

[0292] When the emulsion of the above-described composition is processed within the above content range, the hydrophilic properties of the lyocell material can be supplemented.

[0293] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0294] In a specific example of the present application, one or more of the steps described above can be controlled so that the single filament fineness of the filament forming the lyocell multifilament can be 1.67 to 8.89 dtex (1.5 to 8.0 denier). The single filament fineness refers to the fineness of one single monofilament separated from the multifilament.

[0295] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and ensuring fairness of a filter for smoking articles.

[0296] In some embodiments, in the method for manufacturing a lyocell material, the emulsion treatment step may be performed using an emulsion solution having an emulsion content of 2 wt% to 10 wt% based on 100% of the total emulsion solution. When the emulsion content applied to the lyocell multifilament satisfies the above range, an average crimp count of 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch) may be provided in the crimping step.

[0297] If the emulsion treatment step is omitted (i.e., if the emulsion content is 0 wt.%), the friction between the lyocell multifilament and the crimping device within the crimping device (hereinafter also referred to as "crimper") may increase excessively, and the discharge of the lyocell multifilament out of the crimping device may be restricted. As a result, the step of imparting crimp to the lyocell multifilament may not be performed.

[0298] Meanwhile, when the content of the emulsion is less than 2 wt%, the number of crimps imparted may be excessive, and the uniformity of the crimps imparted to the center and edges of the lyocell material may be insufficient due to increased frictional force. Conversely, when the content of the emulsion exceeds 10 wt%, the number of crimps imparted may be insufficient, resulting in a significantly lower swelling index.

[0299] In some embodiments, in the method for manufacturing a lyocell material, the temperature of the emulsion solution may be 20°C to 80°C. When the temperature of the emulsion applied to the lyocell multifilament satisfies the above range, the emulsion may be uniformly applied to the lyocell multifilament, and an average number of crimps of 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch) may be applied in the crimp application step.

[0300] Meanwhile, when the temperature of the emulsion is below 20℃, the viscosity of the emulsion may be excessive, causing the emulsion to be applied unevenly to the lyocell multifilament, and the number of crimps imparted may be excessive due to the partial increase in friction. In addition, the uniformity of the crimps imparted to the ends of the lyocell material may be insufficient due to the increase in friction. Conversely, when the temperature of the emulsion exceeds 80℃, the viscosity of the emulsion may decrease, causing the number of crimps imparted to be insufficient, resulting in a significantly low swelling index.

[0301] In some embodiments, in the method for manufacturing lyocell material, the moisture content of the lyocell multifilament may be controlled. The moisture content may be a value measured according to Equation 3 below.

[0302] [Formula 3]

[0303] Moisture content (%) = ((WD) / D) * 100

[0304] In Equation 3, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0305] In some embodiments, for the lyocell material, the moisture content may be a value measured from washed lyocell multifilament, or the moisture content may be a value measured from emulsion-treated lyocell multifilament. For example, if the method for producing lyocell multifilament includes an emulsion-treating step, the moisture content may be a value measured from emulsion-treated lyocell multifilament. Furthermore, if the method for producing lyocell multifilament includes two or more emulsion-treating steps, the moisture content may be a value measured from the last emulsion-treating step performed before the crimping step.

[0306] In some embodiments, in the method for manufacturing a lyocell material, the moisture content of the lyocell multifilament can be controlled to be between 180% and 360%. By ensuring that the lyocell multifilament satisfies the above moisture content range, an average crimp count of between 9.84 ea / cm and 19.69 ea / cm (25 ea / inch and 50 ea / inch) can be imparted in the crimping step.

[0307] If the moisture content is below the lower limit, the number of crimps applied may be insufficient, resulting in a significantly lower swelling index. Conversely, if the moisture content exceeds the upper limit, the number of crimps applied may be excessive, resulting in lyocell material breakage during the swelling process.

[0308] The moisture content may be a value measured from the lyocell filament before crimping. Alternatively, the moisture content may be a value measured from the lyocell filament immediately before crimping. For example, if a washing step is performed immediately before the crimping step, the moisture content may be a value measured from the lyocell multifilament after the washing step is completed.

[0309] Meanwhile, in the manufacture of lyocell material according to some embodiments, the moisture content of the lyocell multifilament may be controlled prior to the step of imparting crimp to the lyocell multifilament.

[0310] In some embodiments, in a method for manufacturing a lyocell material, the moisture content of the lyocell multifilament may be reduced prior to the crimping step. Alternatively, the moisture content of the lyocell multifilament may be reduced during the crimping step.

[0311] In some embodiments, the method for manufacturing lyocell material further includes a step of pressing the lyocell multifilament, and the step of pressing the lyocell multifilament may be included between the washing step and the crimping step. Although not particularly limited, the pressing force of the lyocell multifilament is 29.42 N / cm. 2 34.33 N / cm 2 (3.0 kgf / cm 2 3.5 kgf / cm 2 ) can be performed. The moisture content of the lyocell multifilament can be reduced by pressing the lyocell multifilament. For example, the pressing of the lyocell multifilament can be performed by a roll, and in particular, by a nip roll.

[0312] Although not specifically limited, the above-described spinning, coagulation, washing and / or emulsion treatment steps may be controlled so that the above-described crimp factor and crimp efficiency index can be secured.

[0313]

[0314] <(e) Crimp application step>

[0315] The crimping step is a step in which pressure is applied to the emulsion-treated lyocell multifilament through steam and / or a press roller to obtain a crimped multifilament, preferably a crimped tow. The crimping step may be referred to as a crimping step.

[0316] Crimping imparts waves to the lyocell multifilament, giving the fibers bulky properties. Crimping can be performed using any known crimping device, such as a stuffer box and / or a steam box. The usable crimping device is not particularly limited, as long as it can apply one or more of the pressures described below.

[0317] In some embodiments, in the method for manufacturing a lyocell material, steam may not be used prior to the crimping step, during the crimping step, or prior to and during the crimping step. The use of steam may excessively increase the moisture content and temperature of the lyocell material, resulting in the production of a lyocell material with impaired swelling properties. Furthermore, the impaired swelling properties may limit the production of a filter for a smoking article comprising the lyocell material.

[0318] For example, the crimping step may be performed by pressing the lyocell multifilament with a press roller to form wrinkles in the lyocell multifilament. Furthermore, steam may not be supplied prior to pressurization, steam may not be supplied simultaneously with pressurization, or steam may not be supplied both prior to pressurization and simultaneously with pressurization.

[0319] For example, the crimping step applies a pressure of 14.71 to 39.23 N / cm to the lyocell multifilament fed into the crimping device using a press roller. 2 (1.5 to 4.0 kgf / cm 2 ) can be performed while applying pressure.

[0320] For example, 15.69 N / cm 2 (1.6 kgf / cm 2 ) above, 16.67 N / cm 2 (1.7 kgf / cm 2 ) or more, 17.65 N / cm 2 (1.8 kgf / cm 2 ) above, 18.63 N / cm 2 (1.9 kgf / cm 2 ) above, 19.61 N / cm 2 (2.0 kgf / cm 2 ) or more, 20.60 N / cm 2 (2.1 kgf / cm2 ) above, 21.58 N / cm 2 (2.2 kgf / cm 2 ) above, 22.56 N / cm 2 (2.3 kgf / cm 2 ) above, 23.54 N / cm 2 (2.4 kgf / cm 2 ) or more or 24.52 N / cm 2 (2.5 kgf / cm 2 ) or more pressure can be applied to the lyocell multifilament through the press roller. Also, 38.25 N / cm 2 (3.9 kgf / cm 2 ) below, 37.27 N / cm 2 (3.8 kgf / cm 2 ) below, 36.29 N / cm 2 (3.7 kgf / cm 2 ) below, 35.31 N / cm 2 (3.6 kgf / cm 2 ) below, 34.33 N / cm 2 (3.5 kgf / cm 2 ) below, 33.35 N / cm 2 (3.4 kgf / cm 2 ) below, 32.37 N / cm 2 (3.3 kgf / cm 2 ) below, 31.39 N / cm 2 (3.2 kgf / cm 2 ) below, 30.41 N / cm 2 (3.1 kgf / cm 2 ) below, 29.42 N / cm 2 (3.0 kgf / cm 2 ) below, 28.44 N / cm 2 (2.9 kgf / cm 2 ) below, 27.46 N / cm 2 (2.8 kgf / cm 2 ) below, 26.48 N / cm 2 (2.7 kgf / cm 2 ) or less, 25.50 N / cm 2(2.6 kgf / cm 2 ) or less or 24.52 N / cm 2 (2.5 kgf / cm 2 ) The following pressure can be applied by the press roller.

[0321] The pressure of the press roller is within the above range. If the pressure is less than the above range, the desired number of crimps may not be sufficiently formed. Furthermore, if the roller pressure exceeds the above range, the pressing force may be too strong, preventing the filaments from being smoothly fed into the crimping device or passing through the crimping device (e.g., stuffer box). Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0322] For example, using the upper plate, the pressure on the lyocell multifilament is 0.98 to 19.61 N / cm 2 (0.1 to 2 kgf / cm 2 ) can be applied to the lyocell multifilament. Additionally, the upper plate can apply pressure to the lyocell multifilament as it passes through or passes through the press roller.

[0323] For example, the pressure applied by the upper plate is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2 ) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) below the pressure can be applied by the upper plate.

[0324] Furthermore, the pressure of the upper plate, which moves up and down to provide uniform crimp after passing through the press roller, is 0.98 N / cm 2 (0.1 kgf / ㎠), the upper plate may not be fixed due to the pressure inside the crimping device (e.g., stuffer box), and the tow may remain inside the crimping device (e.g., stuffer box) for a long time, preventing the continuity of the process. 19.61 N / cm 2 If it exceeds (2 kgf / ㎠), the steam may not be discharged smoothly inside the crimp device (e.g., stuffer box), which may result in an irregular crimp shape.

[0325] For example, the crimping step may employ a doctor blade that applies a predetermined pressure to the lyocell multifilament. The doctor blade controls the residence time of the filaments fed into the crimper (e.g., stuffer box), thereby contributing to the control of the number of crimps. Such a doctor blade may be positioned, for example, in the path of the lyocell multifilaments that are discharged from the roller pressure point after being pressed by the roller described above.

[0326] For example, the crimping step uses a doctor blade to apply a pressure of 0.98 to 19.61 N / cm to the lyocell multifilaments passed through the rollers of the crimping device. 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying pressure.

[0327] For example, the pressure applied by the doctor blade is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2 ) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) The following pressures can be applied by the doctor blade.

[0328] For example, the crimping step may be performed at a temperature in the range of 120 to 250°C. If the temperature is too low, the shape stabilization effect of the crimp may not be good, and if the temperature is too high, the concentration of the oil content in the crimping device (e.g., stuffer box) may increase, making crimp formation difficult. Therefore, considering the steam pressure described above, etc., the temperature may be appropriately controlled in the range of 130°C or higher, 140°C or higher, or 150°C or higher, and 200°C or lower, 180°C or lower, or 160°C or lower.

[0329]

[0330] <(f) Binder processing step>

[0331] In some embodiments, the method may further comprise the step of treating the lyocell multifilament obtained by the emulsion-treated or crimp-imparting step with a binder.

[0332] When manufacturing a smoking article filter using lyocell material (e.g., lyocell tow), an additional binder may be used. The binder increases the hardness of the lyocell-containing smoking article filter, thereby preventing problems such as filter jamming during the filter manufacturing process or cigarette manufacturing.

[0333] The method for treating (e.g., coating) the lyocell material with a binder is not particularly limited. For example, the binder treatment may be performed by immersing the lyocell multifilaments in a bath filled with the binder and / or binder solution so that the lyocell multifilaments are completely immersed in the binder and / or binder solution. Alternatively, the binder treatment (e.g., coating) of the lyocell multifilaments may be performed by spraying and / or atomizing the binder and / or binder solution using a nozzle.

[0334] The types and components of available binders are as described above, so they are omitted.

[0335] For example, the binder and / or binder solution may further include a solvent in addition to the above-described components. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin. When the binder and / or binder solution includes a solvent, the solvent content may be, for example, about 20 to 80 wt% or about 40 to 60 wt% based on 100 wt% of the total binder and / or binder solution.

[0336] The above binder treatment may be performed at a level that can achieve the purpose of the above-described binder treatment. For example, the binder treatment may be performed so that the binder content satisfies a range of 20 wt% or less, for example, 8 to 15 wt%, based on 100 wt% of the emulsion and binder-treated lyocell multifilament. In this case, the content may refer to the dry weight after the solvent or liquid component that may be included in the binder has evaporated.

[0337] After the binder is coated on the lyocell multifilament, drying of the binder may be performed. The drying temperature is not particularly limited, but drying may be performed at room temperature (approximately 10 to 35°C), for example.

[0338]

[0339] <(g) Other steps>

[0340] After crimping, additional appropriate post-processing may be performed.

[0341] In some embodiments, a secondary emulsion treatment (g1) may be additionally performed. The secondary emulsion treatment may further impart flexibility to the lyocell multifilament (e.g., lyocell tow). The secondary emulsion treatment may be performed in the same manner as or in accordance with the emulsion treatment step (d) described above.

[0342] In particular, secondary emulsion treatment can be performed by emulsifying lyocell multifilament (e.g., lyocell tow) that has undergone a crimper process. This can be advantageous in various processes performed during the manufacturing of filters for smoking articles. For example, secondary emulsion treatment can not only ensure that the fibers and filter are easily spreadable in air during the spreading process, but also limit fiber breakage during the drawing process.

[0343] The secondary emulsion treatment described above may be performed before or after the binder treatment. Alternatively, the secondary emulsion treatment may be performed regardless of whether the binder treatment is performed.

[0344] Even in cases where the secondary emulsion treatment as described above is performed, the secondary emulsion treatment process can be performed so that the content of the emulsion or OPU content in the material satisfies the range described above.

[0345] In some embodiments, a drying process (g2) may be additionally performed. This drying process may be performed, for example, at a temperature ranging from 100 to 130°C. The drying process method or method is not particularly limited, and known techniques may be utilized. For example, this may be accomplished by applying hot air to the tow, passing the lyocell multifilament (e.g., lyocell tow) through a temperature-controlled room for a predetermined period of time, or leaving it in that room.

[0346]

[0347] The lyocell material according to the present invention can be obtained by the method for producing the lyocell material as described above.

[0348] The lyocell material according to the present invention may be a material obtainable by the method for producing a lyocell material as described above.

[0349]

[0350] [Smoking items]

[0351] Although not specifically limited, the lyocell material manufactured by the above method may be incorporated into a smoking article. The smoking article may be an aerosol-generating article. The aerosol-generating article may include an aerosol-generating material or an aerosol-forming substrate.

[0352] For example, lyocell material may be incorporated into a combustible cigarette. As another example, lyocell material may be incorporated into a heated cigarette, and the heated cigarette may be used in conjunction with an aerosol generating device.

[0353] For example, when used as a heated smoking article, the smoking article may be separately inserted into an aerosol generating device. Here, the aerosol generating device may include a receiving groove in which the aerosol generating article can be received, and in addition, may include a heater for heating the aerosol generating article so as to generate an aerosol, a control unit for controlling the overall operation of the aerosol generating device, a battery for providing power used for the operation of the aerosol generating device, and a detector for recognizing that the aerosol generating article has been inserted into the aerosol generating device.

[0354] A smoking article may include a tobacco medium, a filter for a smoking article, and a wrapper, wherein the filter for the smoking article may be positioned at one end of the tobacco medium, for example, at the rear end or the front end. The tobacco medium and the filter for the smoking article may each include a single segment, or may independently include multiple segments.

[0355] The above tobacco medium comprises a tobacco substance, and the tobacco substance comprises nicotine. In addition, the tobacco medium may additionally comprise one or more excipients.

[0356] Excipients may include binders, fillers, and other additives. For example, the tobacco medium included in the tobacco medium portion may be manufactured in the form of granules containing tobacco substances and excipients.

[0357] For example, to maintain the shape, strength, and mass of the tobacco medium, a filler may be additionally included. For example, lyocell material may be included in the tobacco medium. Furthermore, lyocell material may be used as a filler.

[0358] The above wrapper can be subdivided into a cigarette paper wrapping the tobacco medium, a filter paper wrapping the filter, and a tipping wrapper combining the tobacco medium and the filter.

[0359]

[0360] [Filter for smoking items]

[0361] Lyocell material can be used in filters for smoking articles. The lyocell material may be lyocell tow. In some embodiments, the lyocell tow comprises crimped lyocell multifilament.

[0362] For example, the present application relates to a filter for a smoking article. The filter for the smoking article comprises a lyocell material, which may be the same as described above. Furthermore, the filter for the smoking article comprises lyocell tow, which may be the same as described above.

[0363] In addition, the lyocell material includes the emulsion in an amount of 0.1 wt% or more relative to 100 wt% of the total lyocell material. In addition, the description of the emulsion components and content according to the specific example of the present application is the same as described above.

[0364] In some embodiments, the single fiber count of the filaments forming the lyocell multifilament may be from 1.67 to 8.89 dtex (1.5 to 8.0 denier). The specific values ​​are the same as described above.

[0365] In some embodiments, the crimped lyocell multifilament may be a lyocell material having a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier), preferably lyocell tow. The specific values ​​are the same as described above.

[0366] In some embodiments, the crimped lyocell multifilament may have crimps of 3.94 to 23.62 per centimeter (10 to 60 per inch). The specific values ​​are the same as described above.

[0367] In some embodiments, the filter for a smoking article may further include a binder on the surface of the crimped lyocell multifilament or between the crimped lyocell multifilaments. The binder increases the hardness of the filter for a smoking article manufactured from tow, thereby preventing problems such as filter jamming during the filter manufacturing process or the cigarette manufacturing process. The description of the types, components, and contents of usable binders is the same as described above.

[0368] In some embodiments, the filter for the smoking article may further include a wrapping paper (which may be referred to as a wrapping paper, a filter paper, or a filter wrapping paper). For example, the wrapping paper may be porous or non-porous paper that wraps the lyocell tow described above and is capable of maintaining the filter shape (e.g., a cylinder or a cylindrical shape).

[0369] In a specific example of the present application, the filter for the smoking article may have a predetermined shape and size.

[0370] For example, the filter may have a rod shape. In particular, the filter for the smoking article may have a cylindrical shape.

[0371] Additionally, the filter may have a length of, for example, 10 to 50 mm. In particular, the length of the filter may have a lower limit of 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, 35 mm or more, 40 mm or more, or 45 mm or more, and an upper limit of 45 mm or less, 40 mm or less, 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0372] In a specific example of the present application, the filter having the above length may have a circular cross-section, and the circumference of the circular cross-section may be 10 to 40 mm. For example, the lower limit of the circumference of the filter may be 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, or 35 mm or more, and the upper limit may be 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0373] In some embodiments, the filter for the smoking article may include lyocell tow and filter paper. Descriptions of the lyocell tow and filter paper are the same as those described above, and are therefore omitted.

[0374] The above-described paper may be porous paper or non-porous paper that can wrap the above-described lyocell tow and maintain a filter shape (e.g., a cylinder or a cylindrical shape).

[0375] For example, when a porous paper is used, the paper may have a porosity of 10 to 50,000 CU (Coresta Unit). A Coresta Unit is 1 cm at a pressure difference of 1 kPa. 2 The volume flow rate (cm) of air passing through the substrate sample (i.e., porous paper) 3 min -1) can be defined. In particular, the lower limit of the porosity of the above-mentioned paper may be, for example, 1000 CU or more, 5000 CU or more, 10000 CU or more, 15000 CU or more, 20000 CU or more, 25000 CU or more, 30000 CU or more, 35000 CU or more, 40000 CU or more, or 45000 CU or more, and the upper limit may be, for example, 45000 CU or less, 40000 CU or less, 35000 CU or less, 30000 CU or less, 25000 CU or less, or 20000 CU or less. In a specific example of the present application, the paper may have a porosity within a range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0376] For example, the weight of the above paper is 15 to 60 g / cm 2　 It can be. In particular, the lower limit of the basis weight of the above-mentioned paper is, for example, 20 g / cm 2 Above, 25 g / cm 2 Above, 30 g / cm 2 Above, 35 g / cm 2 Above, 40 g / cm 2 Above, 45 g / cm 2 Above, 50 g / cm 2 or more than 55 g / cm 2 It can be ideal, and the upper limit is, for example, 55 g / cm 2 Below 50 g / cm 2 Below 45 g / cm 2 Below 40 g / cm 2 Below 35 g / cm 2 Below 30 g / cm 2 Below 25 g / cm 2 Less than or equal to 20 g / cm 2 It may be less than 16 g / cm. For example, the above-mentioned paper is 16 g / cm 2 Above, 17 g / cm 2 Above, 18 g / cm 2 Above, 19 g / cm 2Above, 20 g / cm 2 or more than 21 g / cm 2 Above, and 25 g / cm 2 Below, 24 g / cm 2 Below, 23 g / cm 2 Below, 22 g / cm 2 Less than or equal to 21 g / cm 2 It can have the following weights:

[0377] Although not particularly limited, the weight of the rod-shaped filter may be 50 mg or more. In particular, the weight of the filter may have a lower limit of, for example, 100 mg or more, 150 mg or more, or 200 mg or more, and an upper limit of, for example, 500 mg or less, 450 mg or less, 400 mg or less, 350 mg or less, 300 mg or less, 250 mg or less, or 200 mg or less.

[0378] Descriptions of other filters for smoking articles and materials included therein are the same as those described above, so they are omitted.

[0379]

[0380] [Method for manufacturing filters for smoking articles]

[0381] For example, the present application relates to a method for manufacturing a filter for a smoking article. The method may be a method for manufacturing a lyocell smoking article filter as described above, and may include a method for manufacturing the lyocell material described above.

[0382] Regarding the manufacturing method for a filter for smoking articles, the remaining steps, excluding the filter manufacturing step, are identical to those described for the lyocell material described above, and therefore, their description is omitted. Any descriptions that overlap with those described above are also omitted.

[0383] The steps for manufacturing a filter can be appropriately performed by those skilled in the art according to known methods. For example, a filter can be manufactured by forming a lyocell-filled paper into a rod shape. Alternatively, a filter can be manufactured by cutting a rod-shaped lyocell-filled filter paper into an appropriate length. The description of the paper is as described above.

[0384] Although not specifically limited, prior to filling the filter paper with lyocell material, additional treatment with an opening agent or plasticizer may be performed on the lyocell material. Opening the lyocell material can increase the surface area of ​​the lyocell material. For example, opening the lyocell material can be achieved by applying an external force in the longitudinal, transverse, and / or thickness directions.

[0385] Preferably, the lyocell material used in the manufacture of filters for smoking articles may be lyocell tow.

[0386] Although not particularly limited, the filter for a smoking article may additionally include known cellulose acetate multifilaments, provided that the purpose of the present invention is not impaired. The cellulose acetate multifilaments may be mixed with lyocell multifilaments. The cellulose acetate multifilaments may be included in a segment distinct from the segments containing the lyocell multifilaments.

[0387]

[0388] According to the present application, a lyocell material for a smoking article filter that can replace commercially available cellulose acetate (CA) and a filter for a smoking article comprising the same are provided. In particular, the uniformity of crimp can be improved, and as a result, a lyocell material suitable for use in a smoking article filter can be manufactured.

[0389]

[0390] The following specific examples of the invention will further illustrate its functions and effects. However, these examples are presented as illustrative examples and do not limit the scope of the invention in any way.

[0391]

[0392] Lyocell material was manufactured using the same process as described in the manufacturing example below. Conditions not specifically mentioned were within the scope of the above description.

[0393]

[0394] [Manufacturing example]

[0395] Cellulose pulp having an alpha cellulose content of 93.9% and a degree of polymerization (DPw) of 820 was mixed with an NMMO / H2O solvent having a propyl gallate content of 0.01 wt% to prepare a spinning dope for producing lyocell multifilament (e.g., lyocell tow) having a cellulose pulp concentration of 11 wt% based on 100 wt% of the total mixture. Then, the spinning dope was spun while maintaining the spinning temperature at 110°C in the spinning nozzle and appropriately adjusting the discharge amount and spinning speed.

[0396] The filament-phase spinning dope discharged from the spinning nozzle was supplied to the coagulating liquid (the coagulating liquid having a concentration of 75 wt% water and 25 wt% NMMO based on 100 wt% of the total coagulating liquid, and having a temperature of approximately 25°C) in the coagulating tank through the air gap section. At this time, the cooling air in the air gap section primarily coagulates the spinning dope at a temperature of 8°C and an air flow rate of 120 N㎥ / h. In addition, the concentration of the coagulating liquid was continuously monitored using a sensor and a refractometer.

[0397] Then, the coagulated lyocell filament was washed. Specifically, the filament was introduced into a traction roller, and the NMMO remaining in the filament was removed with a washing solution sprayed from a washing device. Then, the washed filament was immersed in a bath containing a predetermined emulsion solution.

[0398] The filament is fed to a nip roll installed in the bath discharge section at 29.42 N / cm 2 (3 kgf / cm 2 ) was treated with pressure and put into a crimp machine to give wrinkles.

[0399] In particular, the gap between the upper press roller and the lower press roller included in the crimp device was 0.3 mm, and the pressure of the upper press roller was 24.52 N / cm 2 (2.5 kgf / ㎠), and the pressure of the doctor blade was 9.81 N / cm 2 The tow was manufactured by setting it to (1 kgf / ㎠).

[0400] To prevent static electricity and provide flexibility to the manufactured tow, a secondary emulsion treatment was performed, and immediately after the treatment, the tow product was dried by passing it through a continuous drying device set at 120°C.

[0401]

[0402] The manufactured tow may have a single fiber count of 2.22 to 4.44 dtex (2.0 to 4.0 denier), a total fiber count of 3,333 to 5,000 tex (30,000 to 45,000 denier), and a crimp count of 5.91 to 15.75 ea / cm (15 to 40 ea / inch).

[0403]

[0404] [Example]

[0405] Examples 1 to 6

[0406] Lyocell material was manufactured according to the manufacturing example, and the concentration of the emulsion solution, the temperature of the emulsion solution, and the moisture content of the lyocell multifilament were each controlled as shown in Table 1 below. The moisture content of the lyocell multifilament is a value measured immediately before the lyocell multifilament was fed into the crimper.

[0407]

[0408] Comparative Example 1

[0409] Lyocell material was manufactured according to the manufacturing example, but the emulsion treatment step was omitted. As a result, lyocell material was not manufactured.

[0410] The moisture content was adjusted as shown in Table 1 below. The moisture content of the lyocell multifilament is the value measured immediately before the lyocell multifilament was crimped.

[0411]

[0412] Comparative Examples 2 to 6

[0413] According to the manufacturing example, a lyocell material was manufactured, and the concentration of the emulsion solution (i.e., the content of the emulsion (weight %) based on 100 weight % of the total emulsion solution), the temperature of the emulsion solution, and the moisture content of the lyocell multifilament were each controlled as shown in Table 1 below. The moisture content of the lyocell multifilament is a value measured immediately before the lyocell multifilament was crimped.

[0414]

[0415] Emulsion content (wt%)Temperature of emulsion solution (℃)Moisture content (wt%)Example 17.0040.0318.027.0080.0276.037.0020.0355.047.0060.0181.0510.0060.0277.062.0060.0281.0Comparative example 1--272.0220.0040.0242.0315.0060.0358.047.0060.051.057.00110.0258.061.0020.0418.0

[0416]

[0417]

[0418] [Evaluation example]

[0419] Experiment 1: Evaluation of Crimp Factor and Crimp Efficiency Index

[0420] For each lyocell material obtained in Examples 1 to 6 and Comparative Examples 1 to 6, the crimp factor and crimp efficiency index were evaluated, respectively. The crimp factor was calculated according to Equation 1 below, and the crimp efficiency index was calculated according to Equation 2 below. Each value used in the calculation of the crimp factor and crimp efficiency index was measured as shown in Table 2 below.

[0421] [Formula 1] Crimp factor = number of crimps * radians of crimps

[0422] [Formula 2] Crimp efficiency index = crimp energy * crimp factor

[0423]

[0424] Prior to calculating the crimp factor and crimp efficiency index, each lyocell material was stabilized for 24 hours under constant temperature and humidity conditions. The constant temperature was 20±2°C, and the constant humidity was 65±4%RH. After stabilization, each lyocell material was confirmed to have no mass change of more than 0.25% for 2 hours.

[0425] The number of crimps, crimp height, and crimp length were measured using Textechno's FAVIMAT+, a monofilament property evaluation device. Specifically, monofilaments spooled from lyocell were mounted on jigs of a predetermined length. The initial load was 0.44 cN / tex (0.05 g / d), and the crimp sensitivity was 0.01 mm.

[0426] Using the crimp height and crimp length measured for each lyocell material, the crimp radian was calculated according to Equation 1-1 below, and the results are shown in Table 2 below.

[0427] [Formula 1-1] Crimp radian = arctan((crimp length) / (2 * crimp height))

[0428] The crimp energy of each lyocell material was measured using a Universal Testing Machine (UTM, INSTRON, Model No. 5566).

[0429] Specifically, samples taken from each lyocell material were individually mounted on a dedicated jig 20 cm long. The initial load was 0.98 N (100 gf), and each multifilament was weighted until no crimp was observed from each sample. The average crimp energy measured from each sample is shown in Table 2 below.

[0430]

[0431] Crimp Energy (J)Number of Crimps (ea / cm(ea / inch))Height of Crimp (mm)Length of Crimp (mm)Crimp RadianCrimp Factor (rad·ea / cm(rad·ea / inch))Crimp Efficiency Index (J·rad·ea / cm(J·rad·ea / inch))Example 11.56615.35 (39)0.050.331.2819.75 (50.17)12.60 (32)21.49511.02 (28)0.060.381.2613.94 (35.42)9.45 (24)31.51216.93 (43)0.040.291.3022.04 (55.97)14.57 (37)40.97613.39 (34)0.070.371.2116.14 (40.99)16.54 (42)51.1209.84 (25)0.100.351.0510.35 (26.29)9.06 (23)60.91018.90 (48)0.040.311.3225.02 (63.54)27.56 (70)Comparative Example 1Manufacturing not possible20.6503.15 (8)0.450.440.451.38 (3.50)1.97 (5)30.8825.12 (13)0.250.370.643.13 (7.96)3.54 (9)41.2456.30 (16)0.330.410.563.45 (8.78)2.75 (7)51.2109.45 (24)0.110.351.019.54 (24.23)7.87 (20)60.75021.65 (55)0.020.201.3729.74 (75.54)39.76 (101)

[0432]

[0433] Referring to Table 2 above, it is confirmed that the lyocell materials of Examples 1 to 6 have a crimp factor of 9.84 to 29.53 rad·ea / cm (25 to 75 rad·ea / inch), and it is confirmed that the lyocell materials of Comparative Examples 1 to 6 do not meet the range of the crimp factor.

[0434] In particular, it is confirmed that the lyocell materials of Examples 1 to 6 satisfy a crimp radian of 1.05 to 1.35. In particular, it is confirmed that the lyocell materials of Examples 1 to 6 satisfy a crimp height of 0.04 mm to 0.10 mm. From this, it can be evaluated that the lyocell materials of Examples 1 to 6 have a more stable crimp shape than the lyocell materials of Comparative Examples 1 to 6.

[0435] In addition, referring to Table 2, it is confirmed that the lyocell materials of Examples 1 to 6 have a crimp efficiency index of 8.27 to 39.37 J·rad·ea / cm (21 to 100 J·rad·ea / inch), and it is confirmed that the lyocell materials of Comparative Examples 1 to 6 do not satisfy the crimp efficiency index.

[0436] In particular, it was confirmed that the lyocell materials of Examples 1 to 6 had a crimp count of 9.84 ea / cm (25 ea / inch) or more, while having a crimp energy of 0.91 J or more. On the other hand, Comparative Examples 2 and 3 had a crimp count of less than 5.91 ea / cm (15 ea / inch), Comparative Examples 4 and 5 had a crimp count of less than 9.84 ea / cm (25 ea / inch), while having a crimp energy of 1.2 J or more, and Comparative Example 6 had a crimp count of 21.65 ea / cm (55 ea / inch), while having a crimp energy of 0.75 J.

[0437] In addition, considering that the lyocell materials of Examples 1 to 6 have a crimp factor of 23 or more, it can be evaluated that the relatively high crimp energy is evenly distributed over more crimps.

[0438] In contrast, the lyocell materials of Comparative Examples 2 and 3 were found to have an insufficient number of crimps. In addition, considering that it has a crimp factor of 3.45 rad·ea / cm (8.78 rad·ea / inch), it is evaluated that the lyocell material of Comparative Example 3 does not effectively disperse the crimp energy of 1.245 J.

[0439]

[0440] Experiment 2: Swelling Index of Lyocell Material

[0441] The swelling index was evaluated for the lyocell materials of Examples 1 to 6 and the lyocell materials of Comparative Examples 2 to 6. The swelling index measured for each lyocell material is shown in Table 3 below.

[0442] The swelling index was calculated by multiplying the swelling factor by the number of crimps. The swelling factor was calculated by dividing the change in fiber width before and after permanent deformation of the lyocell material by the change in fiber length before and after permanent deformation of the lyocell material, and the unit was %.

[0443]

[0444] Swelling index (% ea / cm (% ea / inch)) Example 1 5 46.06 (1387) 24 10.24 (1042) 35 78.35 (1469) 44 9 1.34 (1248) 53 74.41 (951) 66 27.17 (1593) Comparative Example 1 - 28.27 (21) 327.95 (71) 445.67 (116) 51 77.95 (452) 6 Not measurable (broken)

[0445]

[0446] Referring to Table 3, the lyocell materials of Examples 1 to 6 were evaluated to have a high swelling index of 354.33 %·ea / cm (900 %·ea / inch) or more. On the other hand, the lyocell materials of Comparative Examples 2 to 5 were evaluated to have a swelling index that was at least 50% lower than that of the lyocell materials of Examples 1 to 5.

[0447] As a result, the lyocell materials of Comparative Examples 2 to 5 were evaluated to have a significantly smaller specific surface area than the lyocell materials of Examples 1 to 6 due to a significantly insufficient swelling index, and were found to be unsuitable for use in filters for smoking articles. In other words, the lyocell materials of Examples 1 to 6 were found to be capable of providing a specific surface area that was at least 50% improved compared to the lyocell materials of Comparative Examples.

[0448] Meanwhile, the lyocell material of Comparative Example 6 was not able to expand, and it was found that the lyocell material was broken when stretched for expansion. From this, it was evaluated that it was impossible to manufacture a filter for a smoking article using the lyocell material of Comparative Example 6.

Claims

1. Contains crimped lyocell multifilament, Lyocell material having a crimp factor of 25 to 75, calculated by the following equation 1: [Formula 1] Crimp factor = number of crimps * radians of crimp In equation 1, The radians of the crimp are calculated using the following equation: [Formula 1-1] Crimp radians = arctan((length of crimp) / (2 * height of crimp)) 2. In paragraph 1, Lyocell material, wherein the number of crimps is 10 ea / inch to 60 ea / inch.

3. In paragraph 1, Lyocell material having the above crimp radian of 1.02 to 1.

50.

4. In paragraph 1, Lyocell material having a crimp height of 0.01 mm to 0.10 mm.

5. In paragraph 1, Lyocell material, wherein the length of the crimp is 0.25 mm to 0.40 mm.

6. In paragraph 1, Lyocell material having a crimp efficiency index of 21 to 100, as expressed by the following formula 2: [Formula 2] Crimp Efficiency Index = Crimp Energy * Crimp Factor In equation 2, Crimp energy refers to the energy required to straighten the crimp, and the unit of crimp energy is J.

7. In paragraph 6, Lyocell material having a crimp energy of 0.9 J to 1.6 J.

8. In paragraph 1, Lyocell material having a single denier of 1.5 to 8.0 of the above Lyocell multifilament.

9. In paragraph 1, Lyocell material with a total denier of 15,000 to 55,000.

10. In paragraph 6, Satisfying the following [condition i], Lyocell material satisfying at least one of the following [condition ii] and [condition iii]: [Condition i] The crimp efficiency index is 23 to 70. [Condition ii] The number of crimps is 25 ea / inch to 50 ea / inch. [Condition iii] The above crimp radian is 1.02 to 1.

50.

11. In paragraph 6, Satisfying the following [condition i], Lyocell material satisfying at least one of the following [condition iv] and [condition v]: [Condition i] The crimp efficiency index is 23 to 70. [Condition iv] The height of the crimp is 0.01 mm to 0.10 mm. [Condition v] The length of the crimp is 0.25 mm to 0.40 mm.

12. In paragraph 1, The above lyocell multifilament comprises one or more monofilaments, Lyocell material, wherein at least one of the above monofilaments has an irregular cross-section.

13. In paragraph 1, Lyocell towine, Lyocell material.

14. In paragraph 1, Lyocell material for filters for smoking articles.

15. In paragraph 1, Lyocell material, not for use in tie-dye or clothing.

16. A filter for a smoking article comprising a lyocell material according to any one of claims 1 to 14.

17. A smoking article comprising a filter for a smoking article according to Article 16.

18. A method for manufacturing a lyocell material, comprising: a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step; The above-mentioned emulsion treatment step is performed using an emulsion solution having a concentration of 2% to 10%, and the temperature of the emulsion solution is 20°C to 80°C. A method for manufacturing a lyocell material, wherein the moisture content of the lyocell multifilament is controlled prior to the above-mentioned crimping step.

19. In paragraph 18, A method for manufacturing lyocell material, wherein the moisture content of the above lyocell multifilament is controlled to 180% to 360%.

20. In paragraph 19, A method for manufacturing a lyocell material, wherein steam is not used prior to the crimping step, during the crimping step, or prior to and during the crimping step.