Lyocell material, filter for smoking articles, smoking article and method of manufacturing thereof

Abstract

The present disclosure relates to lyocell material and filters for smoking articles and smoking articles comprising lyocell material. According to the present application, lyocell material and filters for smoking articles can replace conventional cellulose acetate material and filters for smoking articles comprising the same.

Description

Technical Field

[0001] This disclosure relates to lyocell materials, including filters thereon, smoking articles thereof, and methods of manufacturing them. Background Technology

[0002] To date, cellulose acetate fiber has primarily been used as a material for cigarette filters. While cellulose acetate is known to be biodegradable, filters for smoking products made of cellulose acetate retain their original form for one to two years after being buried in soil, and require a considerable amount of time to fully biodegrade. Considering the quantity and toxicity of tobacco products discarded and left in the living environment, as well as those collected and landfilled as waste after being used for smoking, it is necessary to further improve the biodegradability of filters for smoking products. Therefore, lyocell, which is more environmentally friendly, has recently been chosen as an alternative material to cellulose acetate. Summary of the Invention

[0003] Technical issues

[0004] One object of this disclosure is to provide a lyocell material that can replace commercially available cellulose acetate for use in filters for smoking products.

[0005] Another object of this disclosure is to provide a lyocell material for filters used in smoking products, which is environmentally friendly in its manufacturing process and has excellent biodegradability when discarded.

[0006] Another object of this disclosure is to provide a lyocell filter for use in smoking articles.

[0007] Another object of this disclosure is to provide a smoking product (e.g., a cigarette) that includes a Lyocell filter.

[0008] Solution to the problem

[0009] According to one aspect of this disclosure, a lyocell material may be provided for filters and smoking articles containing it.

[0010] Lyocell materials may include one or more Lyocell multifilaments.

[0011] Lyocell multifilament may consist of one or more Lyocell monofilaments.

[0012] According to one aspect of this disclosure, a lyocell material comprising crimped lyocell multifilaments and having a crimp shape stability of 20% to 60% may be provided.

[0013] In some embodiments, the crimped lyocell multifilament comprises one or more monofilaments. The crimped lyocell multifilament may be considered as the lyocell multifilament of this disclosure.

[0014] Furthermore, according to another aspect of this disclosure, a filter for lyocell smoking products may be provided, comprising a lyocell material with a curl shape stability of 20% to 60%.

[0015] According to another aspect of this disclosure, a smoking article comprising a lyocell material or a filter may be provided.

[0016] According to another aspect of this disclosure, methods for manufacturing lyocell materials, including their filters and smoking products, can be provided.

[0017] As used herein, "smoking articles" can refer to articles capable of generating aerosols, such as tobacco (cigarettes), cigars, etc. In this respect, smoking articles may include aerosol-generating materials or aerosol-forming matrices. Additionally, smoking articles may include solid materials based on tobacco raw materials, such as tobacco sheets, tobacco sticks, and reconstituted tobacco. Furthermore, smoking materials may include volatile compounds.

[0018] Unless otherwise specifically defined in this specification, when the properties of lyocell materials or filters for smoking articles, and their components or compositions, are affected by temperature, the temperature at which these properties are determined or measured may be room temperature. In this context, room temperature is the temperature under conditions that are not particularly cooled or heated, and may be, for example, 10 to 35°C, particularly 15 to 35°C, 20 to 30°C, or about 25°C.

[0019] As used herein, the term "crimp" can refer to a wavy, coiled, or undulating configuration inherent in or imparted to a material (such as a fiber, (mono) filament, multifilament, and / or yarn) by mechanical, thermal, and / or chemical methods. A crimp is characterized by a periodic deviation from the straight axis along the length of the material, fiber, filament, multifilament, and / or yarn. In a material, fiber, filament, multifilament, and / or yarn, a crimp can be defined as a repeating unit of periodic deviation. The presence of crimp affects the properties of the material and the fabrics made from it, such as elasticity, bulk, resilience, and texture.

[0020] As used herein, the term "degree of polymerization" (DPw) refers to the number of monomeric and / or repeating units in a macromolecule, polymer, or oligomer molecule. The degree of polymerization can 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.

[0021] As used herein, “lyocell multifilament” can refer to multifilaments made from cellulose. In particular, lyocell multifilaments can be multifilaments / filaments and / or fibers made from cellulose derived from or primarily derived from wood pulp, especially semi-synthetic multifilaments / filaments and / or fibers.

[0022] As used in this article, a “lyocell bundle” includes at least one lyocell multifilament or is composed of at least one lyocell multifilament.

[0023] As used herein, “tenacity” refers to the ultimate tensile strength per unit linear density or per unit mass of a filament or fiber. It is a measure of a fiber’s ability to withstand tensile or stretching forces without breaking. Tenacity is expressed in units of force per unit linear density, such as cN / tex. Higher tenacity values ​​indicate stronger fibers. Tenacity is measured by dividing the breaking load of a filament or fiber by its mass per unit length.

[0024] As used herein, “average toughness” refers to the average tensile strength of a filament or fiber per linear density or per unit mass. This is a measure of a fiber’s ability to withstand tensile or stretching forces without breaking. Average toughness is expressed in units of force per unit linear density, such as cN / tex. Average toughness is measured by dividing the breaking load of a filament or fiber by its mass per unit length, wherein the toughness is measured for at least two filaments, and the average of the toughness values ​​of these filaments is taken as the average toughness. For example, average toughness is the average of values ​​measured for 20 filaments, the average of values ​​measured for 50 filaments, or the average of values ​​measured for 100 filaments.

[0025] As used herein, “shape stability” refers to the ability of a material (e.g., lyocell) to retain its original shape and / or dimensions under various environmental and force conditions (e.g., chemical or physical effects). One factor that can affect shape stability is the moisture absorbed into the fibers, filaments, or threads that form the material. The better and higher the shape stability of a material, the less shrinkage it experiences during processing and handling, and the more likely it is to retain its original dimensions and shape even after repeated washing and stretching.

[0026] As used herein, the “elongation” of a fiber or filament refers to the length of the fiber or filament extended until it breaks, expressed as a percentage (%) relative to the fiber’s original length. Elongation (%) is calculated by dividing the difference between the final length of the fiber or filament at break and its original length by the original length, and then multiplying that ratio by 100. Here, “average elongation” refers to the average of the elongations of at least two fibers or filaments. For example, average elongation is the average of values ​​measured for 20 filaments, the average of values ​​measured for 50 filaments, or the average of values ​​measured for 100 filaments.

[0027] As used herein, “unwound Lyocell material” refers to Lyocell material and / or Lyocell fiber and / or Lyocell multifilament that has been separated, unwound, unspooled, loosened, or unwrapped from its original compressed and / or wound state.

[0028] As used herein, "non-circular cross-section" refers to a cross-sectional shape that deviates from a standard circular shape. For example, the cross-sectional shape can be Y-shaped, rectangular, star-shaped, leaf-shaped, hexagonal, polygonal, etc. A non-circular cross-section may include three or more protrusions, and preferably three protrusions. Here, "protrusion" can refer to different, extending segments or arms extending outward from the center core or connection point of the monofilament's cross-section. A non-circular cross-section including three protrusions can be referred to as a "Y-shaped cross-section." Lyocell tow can have a Y-shaped cross-section for use in cigarette filters.

[0029] In some embodiments, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have an irregular cross-section.

[0030] In some implementations, the lyocell multifilament comprises one or more monofilaments, and all monofilaments may have irregular cross-sections.

[0031] This disclosure is described in more detail below.

[0032] This disclosure relates to a lyocell material. The lyocell material can be used in smoking articles, and although not particularly limited, it can also be used in filters for smoking articles.

[0033] According to one aspect, a lyocell material is provided comprising crimped lyocell multifilaments, wherein the shape stability of the crimp is 20% to 60%. In some embodiments, the toughness of one or more monofilaments included in the lyocell multifilaments may be from 2.65 cN / tex to 7.06 cN / tex (0.3 g / de to 0.8 g / de).

[0034] In some embodiments, the average toughness of the monofilaments included in the lyocell multifilament can be from 2.65 cN / tex to 7.06 cN / tex (0.3 g / de to 0.8 g / de).

[0035] In some implementations, the elongation of one or more monofilaments included in the lyocell multifilament may be 5% to 10%.

[0036] In some embodiments, the average elongation of the monofilaments included in the lyocell multifilament can be from 5% to 10%.

[0037] In some implementations, the number of curls can be from 3.94 curls / cm (ea / cm) to 19.69 curls / cm (10 curls / inch (ea / inch) to 50 curls / inch).

[0038] In some implementations, the number of curls can be from 9.84 curls / inch to 11.81 curls / cm (25 curls / inch to 30 curls / inch).

[0039] In some implementations, the single fineness of the lyocell multifilament can be 1.67 to 8.89 dtex (1.5 to 8.0 denier).

[0040] Exemplary lyocell materials have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0041] In some implementations, the shape stability of the curl can be calculated using Equation 1: Formula 1 The shape stability of the curl (%) = (L0 - L) b ) / (L0- L) 100 In Equation 1, L represents the length of the monofilament measured under an initial load of 0.01 cN / tex, L0 represents the length of the monofilament measured under a load of 5 cN / tex, and L b This indicates the length of the monofilament measured under restored (0.01 cN / tex) conditions after the 5 cN / tex load was removed.

[0042] In some implementations, the shape stability of the curl can be between 25% and 55%.

[0043] In some implementations, the moisture content of Lyocell multifilament can be between 200% and 350%.

[0044] In some implementations, the moisture content can be a value measured according to Equation 2: Formula 2

[0045] In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0046] In some embodiments, the moisture content can be a value measured from the lyocell filament prior to crimping. Crimping is imparted during the crimping process in the method for manufacturing lyocell material described below.

[0047] In some embodiments, the moisture content can be a value measured from washed lyocell multifilament. Washed lyocell multifilament can refer to lyocell multifilament washed using the methods described below for manufacturing lyocell materials.

[0048] In some embodiments, the moisture content can be a value measured from emulsified lyocell multifilament. Emulsified lyocell multifilament can refer to lyocell multifilament treated with an emulsion using the method for manufacturing lyocell materials described below.

[0049] In some implementations, the lyocell material may be a lyocell tow.

[0050] In some implementations, lyocell material can be used in filters for smoking products.

[0051] In some embodiments, a filter for smoking products is provided, the filter comprising any type of lyocell material.

[0052] In some embodiments, for filters used in smoking articles, the maximum weight of each lyocell material filter can be from 100 mg / filter to 1,000 mg / filter. Specifically, the maximum weight of each lyocell material filter can be from 200 mg / filter to 1,000 mg / filter, 300 mg / filter to 1,000 mg / filter, 400 mg / filter to 1,000 mg / filter, 500 mg / filter to 1,000 mg / filter, 600 mg / filter to 1,000 mg / filter, 700 mg / filter to 1,000 mg / filter, or 800 mg / filter to 1,000 mg / filter.

[0053] In some embodiments, for filters used in smoking articles, the maximum draw resistance of each filter can be from 100 mmWG / filter to 900 mmWG / filter. Specifically, the maximum draw resistance of each filter made of lyocell material can be from 100 mmWG / filter to 900 mmWG / filter, 150 mmWG / filter to 900 mmWG / filter, 200 mmWG / filter to 900 mmWG / filter, 250 mmWG / filter to 900 mmWG / filter, 300 mmWG / filter to 900 mmWG / filter, 350 mmWG / filter to 900 mmWG / filter, or 400 mmWG / filter to 900 mmWG / filter.

[0054] The minimum weight of lyocell material contained in filters for smoking products can be determined by the following method. For example, the minimum weight of lyocell material can be the weight when all conditions 1, 2, and A are met: [Condition 1] The manufacturing process of filters for smoking products can be carried out continuously; [Condition 2] The circumference of the filter used in smoking products is maintained at 24.2 mm; and [Condition A] The filter packaging paper of the filter for smoking products is hollow to a depth of 0.5 mm at one end.

[0055] The maximum weight of the lyocell material contained in filters for smoking products can be determined by the following methods. For example, the maximum weight of the lyocell material can be the weight when all conditions 1, 2, and B are met: [Condition 1] The manufacturing process of filters for smoking products can be carried out continuously; [Condition 2] The circumference of the filter used in smoking products is maintained at 24.2 mm; and [Condition B] The filter for smoking products shall not burst.

[0056] In some embodiments, a smoking article is provided, which includes any one of the filters for smoking articles.

[0057] In some embodiments, a method for manufacturing lyocell material is provided, comprising: spinning a lyocell spinning dope; coagulating the spun lyocell spinning dope to obtain lyocell multifilament; washing the lyocell multifilament; treating the lyocell multifilament with an emulsion; and crimping the lyocell multifilament. In some embodiments, these steps are performed in the order mentioned.

[0058] In addition, in some embodiments, the moisture content of the lyocell multifilament is controlled to be between 200% and 350% before crimping in the method of manufacturing lyocell material.

[0059] In some embodiments, the moisture content of lyocell multifilaments can be controlled during, after, or both during and after washing in the process of manufacturing lyocell material.

[0060] In some embodiments, the moisture content of the lyocell multifilament can be controlled during the washing process in the method of manufacturing lyocell material.

[0061] In some embodiments, the method of manufacturing lyocell material includes obtaining lyocell multifilament by stretching the lyocell multifilament through a first roller, and washing includes stretching the lyocell multifilament through a second roller. The moisture content of the lyocell multifilament can be controlled by the ratio of the rotational speed of the second roller to the rotational speed of the first roller. In some embodiments, the rotational speed of the first roller may be different from the rotational speed of the second roller. In some embodiments, the rotational speed of the second roller may be greater than the rotational speed of the first roller.

[0062] In some embodiments, in the method of manufacturing lyocell material, the stretching of lyocell multifilaments during washing can be performed by one or more rollers, and when the stretching of lyocell multifilaments during washing is performed by more than two rollers, the second roller can be the last roller.

[0063] In some embodiments, in the method of manufacturing lyocell material, the ratio of the rotational speed of the second roller to the rotational speed of the first roller can be from 1.00 to 1.15.

[0064] In some embodiments, the moisture content of the lyocell multifilament can be controlled after washing in the method of manufacturing lyocell material.

[0065] In some embodiments, the moisture content of lyocell multifilaments can be controlled after emulsion treatment in the method of manufacturing lyocell material.

[0066] In some embodiments, the moisture content of lyocell multifilaments can be controlled by applying pressure conditions in the method of manufacturing lyocell materials.

[0067] In some embodiments, the method of manufacturing lyocell material further includes pressurizing the lyocell multifilament, and the pressurization of the lyocell multifilament can be performed between washing and crimping.

[0068] In some embodiments, the method of manufacturing lyocell material further includes pressurizing lyocell multifilaments, and the pressurization of lyocell multifilaments can be performed between emulsion treatment and crimping.

[0069] In some embodiments, in the method of manufacturing lyocell material, the shape stability of the lyocell material after curling can be 20% to 60%.

[0070] In some embodiments, the crimp shape stability of the lyocell material is 20% to 60%. Therefore, the processability of the lyocell material is improved. In particular, when manufacturing filters for smoking articles comprising lyocell material, the performance and manufacturing efficiency of the filter can be improved by using lyocell material with a certain degree of crimp shape stability.

[0071] Specifically, filters for smoking products that include the aforementioned lyocell material can have an increased maximum amount of lyocell material per filter, and can have an increased maximum suction resistance for the filter. As a result, the filtration performance of filters for smoking products that include lyocell material can be improved, and the amount of lyocell material required to achieve a certain filtration performance can be reduced.

[0072] Furthermore, lyocell material, with its certain stability in coil shape, offers improved post-processability. As a result, the efficiency of methods for manufacturing filters for smoking products using lyocell material can be improved. Specifically, the time required to manufacture filters for smoking products can be reduced. More specifically, the number of filters for smoking products manufactured per unit time can be significantly increased.

[0073] Furthermore, in some embodiments, the moisture content of the lyocell multifilaments can be controlled before crimping them during the manufacturing process. Therefore, crimping can be imparted to lyocell multifilaments with controlled moisture content, and the elongation and toughness of the lyocell material can be controlled as a result of crimping. Consequently, the shape stability of the crimped lyocell material can be maintained within a certain range.

[0074] [Irregular cross-section]

[0075] One or more lyocell monofilaments contained in the lyocell material of this disclosure may have irregular cross-sections. “Irregular” means that the outline shape of the cross-section is not circular, and the “cross-section” can be a cross-section obtained by cutting the lyocell monofilament substantially or practically perpendicular to the longitudinal direction of the filament.

[0076] The profile of the irregular cross-section may contact the imaginary first circle and the imaginary second circle. Furthermore, the imaginary second circle may be drawn 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 the "imaginary circumcircle" and / or the "circumcircle," and / or the "imaginary second circle" may also be referred to as the "imaginary incircle" and / or the "incircle."

[0077] The first imaginary circle can be the circle with the smallest area among the drawn circles, completely enclosing a cross-section of the monofilament. The second imaginary circle can be the circle with the largest area among the circles drawn within the cross-section of the monofilament.

[0078] When the circumcircle of a section including the monofilament can be drawn, the imaginary first circle can be the circumcircle. When the incircle of a section including the monofilament can be drawn, the imaginary second circle can be the incircle.

[0079] The irregular cross-section may have a shape comprising multiple protrusions, for example, a Y-shaped cross-section comprising three protrusions. It is understood that the multiple protrusions are formed as a whole centered on an imaginary second circle, and their ends contact an imaginary first circle. The terms used herein have the same meaning as described above.

[0080] The anisotropy of a single filament can be defined by mathematical formula 1: Mathematical Formula 1 Irregularity = r1 / r2 Where r1 is the radius of the imaginary first circle and r2 is the radius of the imaginary second circle.

[0081] For example, the radius of the imaginary first circle can be 4 to 40 μm, the radius of the imaginary second circle can be 2 to 14 μm, and the irregularity can be 1.01 to 10.

[0082] Furthermore, the space occupancy rate of a single filament can be defined by mathematical formula 2: Mathematical formula 2 Space occupancy rate = (S1 / S2) × 100 (%) Where S1 is the area of ​​the imaginary first circle, and S2 is the cross-sectional area of ​​the monofilament included in the Lyocell fiber.

[0083] For example, the space occupancy of a monofilament with an irregular cross-section can be from 120% to 600%.

[0084] Fineness

[0085] Lyocell multifilament can have a fineness suitable for manufacturing filters for smoking products and ensuring their functionality.

[0086] In one instance, the fineness of the monofilaments forming a lyocell multifilament can be from 1.67 to 8.89 denier (1.5 to 8.0 denier). In this context, monofilament fineness refers to the fineness of a single monofilament separated from the multifilament.

[0087] Specifically, the upper limit of the monofilament fineness can be, for example, below 8.33 dtex (7.5 denier), below 7.78 dtex (7.0 denier), below 7.22 dtex (6.5 denier), below 6.67 dtex (6.0 denier), below 6.11 dtex (5.5 denier), below 5.56 dtex (5.0 denier), below 5.00 dtex (4.5 denier), below 3.89 dtex (3.5 denier), below 3.33 dtex (3.0 denier), below 2.78 dtex (2.5 denier), or below 2.22 dtex (2.0 denier). Additionally, the lower limit can be, for example, 2.22 dtex (2.0 denier) or higher, 2.78 dtex (2.5 denier) or higher, 3.33 dtex (3.0 denier) or higher, 3.89 dtex (3.5 denier) or higher, 4.44 dtex (4.0 denier) or higher, 5.00 dtex (4.5 denier) or higher, 5.56 dtex (5.0 denier) or higher, 6.11 dtex (5.5 denier) or higher, 6.67 dtex (6.0 denier) or higher, 7.22 dtex (6.5 denier) or higher, or 7.78 dtex (7.0 denier) or higher. Meeting the above ranges may be more advantageous in ensuring the stable physical properties (e.g., hardness or suction resistance) and processability of filters for smoking products.

[0088] In one instance, the total fineness of the lyocell multifilament can be from 1,667 to 6,111 tex (15,000 to 55,000 denier). For example, the lower limit of the total fineness can be, 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 Te (21,500 Denier) or more, 2,444 Te (22,000 Denier) or more, 2,500 Te (22,500 Denier) or more, 2,556 Te (23,000 Denier) or more, 2,611 Te (23,500 Denier) or more, 2,667 Te (24,000 Denier) or more, 2,722 Te (24,500 Denier) or more, 2,778 Te (25,000 Denier) or more, 2,833 Te (25,500 Denier) or more, 2,889 Te (26,000 Denier) or more, 2,944 Te (26,500 Denier) or more, 3,000 Te (27,000 Denier) or more Above, 3,056 Te (27,500 Denier) or more, 3,111 Te (28,000 Denier) or more, 3,167 Te (28,500 Denier) or more, 3,222 Te (29,000 Denier) or more, 3,287 Te (29,500 Denier) or more, 3,333 Te (30,000 Denier) or more, 3,389 Te (30,500 Denier) or more, 3,444 Te (31,000 Denier) or more, 3,500 Te (31,500 Denier) or more, 3,556 Te (32,000 Denier) or more, 3,611 Te (32,500 Denier) or more, 3,667 Te (33,000 Denier) or more. 3,722 Te (33,500 Denier) or higher, 3,778 Te (34,000 Denier) or higher, 3,833 Te (34,500 Denier) or higher, 3,889 Te (35,000 Denier) or higher, 3,944 Te (35,500 Denier) or higher, 4,000 Te (36,000 Denier) or higher, 4,056 Te (36,500 Denier) or higher, 4,111 Te (37,000 Denier) or higher, 4,167 Te (37,500 Denier) or higher, 4,222 Te (38,000 Denier) or higher, 4,278 Te (38,500 Denier) or higher, 4,333 Te (39,000 denier) or more, 4,389 special (39,500 denier) or more, 4,444 special (40,000 denier) or more, 4,500 special (40,500 denier) or more, 4,556 special (41,000 denier) or more, 4,611 special (41,500 denier) or more, 4,667 special (42,000 denier) or more, 4,722 special (42,500 denier) or more, 4,778 special ( 43,000 deniers or more, 4,833 special (43,500 deniers or more), 4,889 special (44,000 deniers or more), 4,944 special (44,500 deniers or more), 5,000 special (45,000 deniers or more), 5,056 special (45,500 deniers or more), 5,111 special (46,000 deniers or more), 5,167 special (46,500 deniers or more), 5,222 47,000 deniers or more, 5,278 deniers or more, 5,333 deniers or more, 5,389 deniers or more, 5,444 deniers or more, 5,500 deniers or more, 5,556 deniers or more, 5,611 deniers or more, 5, 667 Te (51,000 deniers) or higher, 5,722 Te (51,500 deniers) or higher, 5,778 Te (52,000 deniers) or higher, 5,833 Te (52,500 deniers) or higher, 5,889 Te (53,000 deniers) or higher, 5,944 Te (53,500 deniers) or higher, 6,000 Te (54,000 deniers) or higher, or 6,056 Te (54,500 deniers) or higher. Additionally, the upper limit can be, for example, below 6,056 tes (54,500 deniers), below 6,000 tes (54,000 deniers), below 5,944 tes (53,500 deniers), below 5,889 tes (53,000 deniers), below 5,833 tes (52,500 deniers), below 5,778 tes (52,000 deniers), below 5,722 tes (51,500 deniers), below 5,667 tes (51,000 deniers), below 5,611 tes (50 Below 500 denier, below 5,556 denier, below 5,500 denier, below 49,500 denier, below 5,444 denier, below 49,000 denier, below 5,389 denier, below 48,500 denier, below 5,333 denier, below 48,000 denier, below 5,278 denier, below 47,500 denier, below 5,222 denier, below 5,167 denier, below 46,500 denier, below 5,111 denier (46,Below 0.000 denier, below 5,056 denier (45,500 denier), below 5,000 denier (45,000 denier), below 4,944 denier (44,500 denier), below 4,889 denier (44,000 denier), below 4,833 denier (43,500 denier), below 4,778 denier (43,000 denier), below 4,722 denier (42,500 denier), below 4,667 denier (42,000 denier), below 4,611 denier (41,500 denier), below 4,556 denier (41,000 denier), below 4,500 denier (40,500 denier), below 4,444 denier (40,000 denier), Below 4,389 T (39,500 denier), below 4,333 T (39,000 denier), below 4,278 T (38,500 denier), below 4,222 T (38,000 denier), below 4,167 T (37,500 denier), below 4,111 T (37,000 denier), below 4,056 T (36,500 denier), below 4,000 T (36,000 denier), below 3,944 T (35,500 denier), below 3,889 T (35,000 denier), below 3,833 T (34,500 denier), below 3,778 T (34,000 denier), below 3,722 T (33, Below 500 deniers, below 3,667 deniers (33,000 deniers), below 3,611 deniers (32,500 deniers), below 3,556 deniers (32,000 deniers), below 3,500 deniers (31,500 deniers), below 3,444 deniers (31,000 deniers), below 3,389 deniers (30,500 deniers), below 3,333 deniers (30,000 deniers), below 3,278 deniers (29,500 deniers), below 3,222 deniers (29,000 deniers), below 3,167 deniers (28,500 deniers), below 3,111 deniers (28,000 deniers), below 3,056 deniers (27,500 deniers). Below 3,000 Tal (27,000 denier), below 2,944 Tal (26,500 denier), below 2,889 Tal (26,000 denier), below 2,833 Tal (25,500 denier), below 2,778 Tal (25,000 denier), below 2,722 Tal (24,500 denier), below 2,667 Tal (24,000 denier), below 2,611 Tal (23,500 denier), below 2,556 Tal (23,000 denier), below 2,500 Tal (22,500 denier), below 2,444 Tal (22,000 denier), below 2,389 Tal (21,500 denier), below 2,333 Tal (21,Below 0.000 denier, below 2,278 denier (20,500 denier), below 2,222 denier (20,000 denier), below 2,167 denier (19,500 denier), below 2,111 denier (19,000 denier), below 2,056 denier (18,500 denier), below 2,000 denier (18,000 denier), below 1,944 denier (17,500 denier), below 1,889 denier (17,000 denier), below 1,833 denier (16,500 denier), below 1,778 denier (16,000 denier), or below 1,722 denier (15,500 denier). When the total fineness is outside the aforementioned range, the processability of manufacturing filters for smoking products may be poor (continuous processes are not possible due to yarn cutting), and when the amount of filaments packed into the filter packaging paper during the manufacturing process is too small or too large, it may be difficult to ensure sufficient physical properties of the filter (e.g., stiffness or suction resistance).

[0089] There are no particular limitations on the method for measuring fineness, but for example, a 2m sample of the Lyocell material to be measured (e.g., a Lyocell filament bundle) is taken and placed and stabilized for 24 hours in a room maintained at 20°C and 65% humidity. One end of the stabilized Lyocell filament bundle is fixed, and a 2kg weight is attached to the other end. After the bundle is held (stabilized) in a tensile state for 5 seconds due to the load, it is cut into 90cm lengths to obtain samples, and the weight of the samples (total fineness) is measured. The fineness is converted to a denier measure, which, according to the denier conversion method, is the measured weight × 10,000. The fineness of the monofilaments in the sample is calculated by dividing the total fineness by the number of monofilament strands in the sample.

[0090] The overall fineness of lyocell multifilaments can be determined by the fineness and crimp number of the monofilaments. In this disclosure, the fineness and crimp number of the monofilaments can be controlled, and the overall fineness of the lyocell material can be ensured to be suitable for manufacturing filters for smoking products and to ensure their function.

[0091] [Number of curls]

[0092] In one instance, lyocell multifilament can have 3.94 to 19.69 crimps per centimeter (10 to 50 crimps per inch).

[0093] For example, the curl count can be 5.91 curls / cm (15 curls / inch) or higher, 7.87 curls / cm (20 curls / inch) or higher, 9.84 curls / cm (25 curls / inch) or higher, 11.81 curls / cm (30 curls / inch) or higher, 13.78 curls / cm (35 curls / inch) or higher, 15.75 curls / cm (40 curls / inch) or higher, or 17.72 curls / cm (45 curls / inch) or higher, and its upper limit can be, for example, less than 17.72 curls / cm (45 curls / inch), less than 15.75 curls / cm (40 curls / inch), less than 13.78 curls / cm (35 curls / inch), 11.81 curls / cm (30 curls / inch), or 9.84 curls / cm (25 curls / inch). The number of curls and their uniformity can be controlled by the pressure and temperature conditions during curling as described below.

[0094] While there are no particular limitations, the number of curls can be measured using, for example, a device used to evaluate the physical properties of monofilaments (e.g., a Favimat). Specifically, a sample of the manufactured lyocell material (preferably a lyocell tow) can be placed and stabilized for 24 hours at a temperature of 20 ± 2 °C and a humidity of 65 ± 4%. The sample can be removed from the stabilized sample without damaging the curls. The removed sample can be fixed to a special clamp 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 curl sensitivity can be 0.01 mm. The number of curls can be measured under the aforementioned conditions (i.e., a temperature of 20 ± 2 °C and a humidity of 65 ± 4%).

[0095] Although there are no particular restrictions, lyocell materials manufactured to meet the above-mentioned monofilament fineness, total fineness and / or crimp number can be used in smoking articles.

[0096] [Physical properties of Lyocell material]

[0097] The curl shape stability of lyocell materials can range from 20% to 60%. Specifically, the lower limit of the curl shape stability of lyocell materials can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, or 55%, and the upper limit of the curl shape stability of lyocell materials can be 60%, 55%, 50%, 45%, 40%, 35%, or 25%.

[0098] In some embodiments, the shape stability of the lyocell material curl can be 20% to 60%, 20% to 55%, 20% to 50%, 20% to 45%, 20% to 40%, 20% to 35%, 20% to 30%, 20% to 25%, 25% to 60%, 25% to 55%, 25% to 50%, 25% to 45%, 25% to 40%, 25% to 35%, 25% to 30%, 30% to 60%, 30% to 55%, 30% to 50%, 30% to 45%, 30% to 40%, 30% to 35%, 35% to 60%, 35% to 55%, 35% to 50%, 35% to 45%, 35% to 40%, 40% to 40%. The uniformity of the curl can be further improved when the shape stability of the lyocell material is 20% to 50%, 40% to 55%, 40% to 50%, 40% to 50%, 45% to 60%, 45% to 55%, 45% to 50%, 50% to 60%, 50% to 55%, or 55% to 60%.

[0099] Furthermore, the shape stability of the coiled Lyocell material can be calculated using Equation 1: Formula 1 The shape stability of the curl (%) = (L0 - L) b ) / (L0- L) 100 In Equation 1, L represents the length of the monofilament measured under an initial load of 0.01 cN / tex, L0 represents the length of the monofilament measured under a load of 5 cN / tex, and L b This indicates the length of the monofilament measured under restored (0.01 cN / tex) conditions after the 5 cN / tex load was removed.

[0100] Furthermore, the crimp shape stability of lyocell material can be the average value measured over multiple monofilaments. For example, the crimp shape stability can be the average value measured over 20 monofilaments, the average value measured over 50 monofilaments, or the average value measured over 100 monofilaments.

[0101] In addition, the measurement of the shape stability of the curl can be performed according to ASTM D3822 (ASTM D3822 / D3822M-14(2020)). For example, the loading time of the monofilament can be 5 seconds, and the recovery time of the monofilament can be 5 seconds.

[0102] When the curl shape stability of lyocell material is between 20% and 60%, the processability of lyocell material is improved. In particular, when manufacturing filters for smoking products that include lyocell material, the performance and manufacturing efficiency of the filter can be improved by using lyocell material with a certain degree of curl shape stability.

[0103] In lyocell materials with a certain degree of curl shape stability, the toughness of one or more monofilaments included in lyocell multifilaments can be from 2.65 cN / tex to 7.06 cN / tex (0.3 g / de to 0.8 g / de).

[0104] In some embodiments, the average toughness of the monofilaments included in the lyocell multifilament may be from 2.65 cN / tex to 7.06 cN / tex (0.3 g / de to 0.8 g / de).

[0105] In some implementations, the elongation of one or more monofilaments included in the lyocell multifilament may be 5% to 10%.

[0106] In some embodiments, the average elongation of the monofilaments included in the lyocell multifilament can be from 5% to 10%.

[0107] In addition, the elongation and toughness of a monofilament can be measured using a tensile testing machine. The object on which the elongation and toughness are measured using a tensile testing machine can be a monofilament extracted from lyocell material.

[0108] For example, the elongation and toughness of monofilaments extracted from lyocell materials can be measured using a low-speed stretching machine from INSTRON, Co. The measurement conditions for elongation and toughness can be kept constant. For instance, the elongation and toughness of a monofilament can be measured separately or simultaneously by stretching the monofilament at a specific rate. This specific rate could be 60 mm / min. Furthermore, the measurement temperature, pressure, and / or humidity for elongation and toughness can be kept uniform.

[0109] In addition, monofilament stabilization can be performed before measuring the shape stability, elongation, and toughness of the curl. According to KS K ISO 139, stabilization can be achieved by placing the monofilament under constant temperature (20±2℃) and constant humidity (65±4%RH) conditions.

[0110] When lyocell materials with a certain degree of curl shape stability also possess a certain degree of toughness and elongation, or a certain average toughness and average elongation, the post-processability of lyocell materials can be further improved. As a result, the efficiency of methods for manufacturing filters for smoking products using lyocell materials can be increased. In particular, the time required to manufacture filters for smoking products can be reduced. Specifically, the number of filters for smoking products manufactured per unit time can be significantly increased.

[0111] [Moisture content of Lyocell multifilament]

[0112] For example, the moisture content of lyocell multifilament can be between 200% and 350%. When the moisture content of lyocell multifilament is less than 200%, the crimp shape stability of lyocell multifilament can exceed the range of 20% to 60%.

[0113] In some embodiments, the moisture content of the lyocell multifilament can be 200% to 350%, 200% to 330%, 200% to 310%, 200% to 290%, 200% to 270%, 200% to 250%, 200% to 230%, 200% to 210%, 220% to 350%, 220% to 330%, 220% to 310%, 220% to 290%, 220% to 270%, 220% to 250%, 220% to 230%, 240% to 350%, 240% to 330%, 240% to 310%, 240% to 290%, 240% to 270%, 240% to 250%, 260%. % to 350%, 260% to 330%, 260% to 310%, 260% to 290%, 260% to 270%, 280% to 350%, 280% to 330%, 280% to 310%, 280% to 290%, 300% to 350%, 300% to 330%, 300% to 310%, 320% to 350%, 320% to 330%, or 340% to 350%.

[0114] When manufacturing filters for smoking products, a constant tension is applied to the crimped lyocell multifilaments, causing them to open in both the length and width directions. However, excessive shape stability due to the crimping leads to increased tension, which in turn reduces openness. This reduced openness can decrease the maximum amount of lyocell material introduced into each filter's packaging paper, potentially lowering the maximum draw resistance of the filter and degrading its manufacturability.

[0115] Conversely, when the moisture content of lyocell multifilament exceeds 350%, the crimp shape stability of lyocell multifilament may be less than the range of 20% to 60%.

[0116] As a result, when manufacturing filters for lyocell smoking products, the curl imparted during the application of constant tension to the lyocell multifilaments may not be able to maintain its shape, causing the curled lyocell multifilaments to open up in both the length and width directions.

[0117] In addition, excessive moisture may cause insufficient crimping of lyocell multifilaments. Due to the inability to maintain the shape of the crimp or insufficient number of crimps, the maximum amount of lyocell material per filter may decrease, the maximum suction resistance of filters for smoking products may also decrease, and the manufacturability of filters for smoking products may also deteriorate.

[0118] The moisture content of lyocell multifilament can be measured according to Equation 2: Formula 2

[0119] In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0120] Moisture content can be a value measured by the Lyocell filament before crimping (before crimping). Alternatively, moisture content can be a value measured by the Lyocell filament just before crimping. For example, when washing is performed just before crimping, the moisture content can be a value measured by the Lyocell multifilament after washing.

[0121] Additionally, the moisture content can be a value measured from emulsified Lyocell multifilament. For example, when the method of manufacturing Lyocell multifilament includes emulsion treatment, the moisture content can be a value measured from the emulsified Lyocell multifilament. Furthermore, when the method of manufacturing Lyocell multifilament includes emulsion treatment more than twice, the moisture content can be a value measured during the final emulsion treatment before crimping.

[0122] Therefore, the moisture content of Lyocell multifilaments can be controlled during, after, or both during and after washing. Moisture content can be controlled during, after, or both during and after emulsion treatment.

[0123] In some embodiments, the method of manufacturing lyocell material further includes pressurizing the lyocell multifilament, and the pressurization can be performed between washing and crimping. While there are no particular limitations, the pressurization of the lyocell multifilament can reach 29.42 N / cm. 2 Up to 34.33 N / cm 2 (3.0 kgf / cm2 Up to 3.5 kgf / cm 2 (This will be carried out below.)

[0124] The moisture content of Lyocell multifilaments can be controlled as described above by applying pressure to them.

[0125] [Adhesive]

[0126] In a non-limiting example, the lyocell material may further include an adhesive. The adhesive may be present, for example, on the surface of lyocell multifilaments, or between lyocell multifilaments (or monofilaments). The adhesive can increase the rigidity of filters for smoking products, thereby preventing problems such as filter clogging during the manufacturing process of the filter or the manufacturing process of smoking products (e.g., cigarettes).

[0127] The type of adhesive that can be used is not particularly limited, and any known adhesive may be used, provided that it does not impede the purpose of this disclosure. For example, an adhesive that provides sufficient compatibility with the emulsion used in this disclosure, can improve the stiffness of the filter, and can provide excellent adhesive strength may be used.

[0128] In one non-limiting example, the adhesive may include polyester adhesives, cellulose adhesives, and / or vinyl adhesives.

[0129] Although there are no particular restrictions, polyester adhesives comprising one or more of the group consisting of alkylene, aryl and heteroaryl groups having 5 to 12 carbon atoms may be used as polyester adhesives.

[0130] Examples of available cellulosic adhesives may include, but are not limited to, hydroxypropyl methylcellulose (HPMC), ethylcellulose (EC) and / or methylcellulose (MC), and carboxymethylcellulose (CMC).

[0131] In some embodiments, the cellulose adhesive is selected from the group consisting of hydroxypropyl methylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and any combination thereof.

[0132] Examples of available vinyl adhesives may include, but are not limited to, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and / or ethylene vinyl acetate (EVAc).

[0133] In some embodiments, the vinyl adhesive is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and any combination thereof.

[0134] The following describes a method for applying (coating) an adhesive to a Lyocell material.

[0135] [Lotion]

[0136] Lyocell material may comprise: lyocell multifilaments; and an emulsion coated onto the lyocell multifilaments. Furthermore, the emulsion comprises: (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. Such an emulsion may be applied to part or all of the monofilaments or multifilaments forming the lyocell material. Furthermore, the emulsion may permeate between the filaments.

[0137] An emulsion containing at least components (a) and (b) can be hydrophobic. As a result, lyocell materials treated with this emulsion exhibit excellent spreadability.

[0138] In some embodiments, the lyocell material may include a certain amount of emulsion. In this regard, the amount of emulsion may refer to the OPU (oil pick-up ratio) as described below. "OPU" can refer to "oil absorption rate". For example, based on 100% by weight of all lyocell material, the lyocell material may include more than 0.1% by weight of emulsion. Specifically, based on 100% by weight of all lyocell material, the amount of emulsion may be more than 0.5% by weight, more than 1.0% by weight, more than 1.5% by weight, more than 2.0% by weight, more than 2.5% by weight, more than 3.0% by weight, particularly more than 3.5% by weight, more than 4.0% by weight, more than 4.2% by weight, more than 4.5% by weight, more than 5.0% by weight, more than 5.5% by weight, more than 6.0% by weight, more than 6.5% by weight, more than 7.0% by weight, more than 7.5% by weight, more than 8.0% by weight, more than 8.5% by weight, more than 9.0% by weight, or more than 9.5% by weight. Furthermore, its upper limit can be, for example, less than 20.0 wt%, less than 18.0 wt%, less than 17.0 wt%, less than 16.0 wt%, less than 15.0 wt%, less than 14.5 wt%, less than 14.0 wt%, less than 13.5 wt%, less than 13.0 wt%, less than 12.5 wt%, less than 12.0 wt%, less than 11.5 wt%, less than 11.0 wt%, less than 10.5 wt%, less than 10 wt%, less than 9.5 wt%, less than 9.0 wt%, less than 8.5 wt%, less than 8.0 wt%, less than 7.8 wt%, or less than 7.6 wt%.

[0139] As a method for measuring the amount of emulsion (OPU), an extrusion method can be used, for example. For example, a sample (e.g., 2 to 5 g, particularly about 2.5 g) (the weight of the sample taken is called the sample weight) is taken and injected into a syringe-shaped container. The material of the container is not particularly limited, but can be SUS (Stainless Steel). Next, a solvent (e.g., methanol) is injected into the container containing the sample (the amount of solvent injected can be less than 10 ml (e.g., about 8 ml)). When injecting the solvent into the sample, a dripping method can be used, where the dripping rate can be uniformly controlled. Alternatively, the solvent injected into the container as described above can drip from one end of the syringe-shaped container onto a plate. At this point, the plate is pre-weighed (the weighed weight is called the plate weight A), and the plate is mounted such that the solvent dripped onto the plate can be carried away (i.e., evaporated) at a temperature of 120°C to 130°C (e.g., 125°C). The solvent injection and solvent dripping as described above are performed three times, and a pressure (e.g., 98 N / cm²) is applied to the sample using the syringe-shaped container. 2 (10kgf / cm 2 Below 49 N / cm 2 (5kgf / cm 2 Below 18 or 39 N / cm 2 (2 to 4 kgf / cm) 2 Press the sample once. This allows the solvent and emulsion present in the sample to be fully squeezed out. Squeeze the sample under pressure until no more solvent flows out. Then, 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 amount of emulsion according to the following formula: Mode: Amount of emulsion squeezed out (OPU, % or weight %) ={(plate weight B - plate weight A) / (sample weight)}×100 Furthermore, the Lyocell material used as a standard for emulsion dosage can be at least one emulsified Lyocell multifilament. For example, the Lyocell material can be Lyocell multifilament that has undergone one emulsion treatment (described below), Lyocell multifilament that has undergone one emulsion treatment (described below) and two emulsion treatments (described below), or Lyocell multifilament that has undergone adhesive treatment as described below and emulsion treatment as described above. Additionally, Lyocell multifilament that has undergone emulsion treatment and / or adhesive treatment can be crimped.

[0140] Regarding the emulsion of this disclosure, component (a) may be a compound that can be used as a type of lubricant or oil, and may be a component that is harmless to humans and suitable for use in food. Component (a) lubricates the fibers introduced into the crimping machine. When lubrication is insufficient, the lyocell will clump together and cannot pass through the crimping machine, while when lubrication is excessive, there is a problem that the crimp cannot form properly. Taking these functions into account, the amount of component (a) can be controlled as described below.

[0141] For component (a), there are no particular restrictions on the type of fatty acid with 16 or more carbon atoms that forms the ester. Fatty acids with 16 or more carbon atoms can be used, as long as they provide sufficient esters that are harmless to humans for use in food.

[0142] For example, fatty acids with more than 16 carbon atoms can be saturated fatty acids and / or unsaturated fatty acids.

[0143] Examples of saturated fatty acids may include palmitic acid (hexadecanoic acid, CH3(CH2)). 14 COOH), pearlitic fatty acid (heptadecanoic acid, CH3(CH2) 15 COOH), stearic acid (octadecanoic acid, CH3(CH2) 16 COOH), nonadecanoic acid (nonadecanoic acid, CH3(CH2)) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2)). 18 (COOH). However, the types of saturated fatty acids available are not limited to this.

[0144] Examples of unsaturated fatty acids can include 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). However, the types of unsaturated fatty acids available are not limited to this.

[0145] In some embodiments, the fatty acids are selected from the group consisting of palmitic acid, pearlitic acid, stearic acid, nonadecanic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid, and arachidonic acid.

[0146] There is no particular limit to the number of carbon atoms in fatty acids with 16 or more carbon atoms, but it can be, for example, below 40, below 36, below 32, below 28, below 24, or below 20.

[0147] There are no particular restrictions on the type of aliphatic monohydric alcohol that forms component (a). Aliphatic monohydric alcohols that can provide esters that are harmless to humans and suitable for use in food can be used.

[0148] For example, aliphatic monohydric alcohols can be saturated or unsaturated fatty alcohols in the form of straight or branched chains.

[0149] In some embodiments, the aliphatic monohydric alcohol may have 1 to 40 carbon atoms. In particular, the number of carbon atoms in the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0150] Examples of aliphatic monohydric alcohols may include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotriadecyl alcohol, or stearyl alcohol.

[0151] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotriadecyl alcohol, and stearyl alcohol.

[0152] In some embodiments, an ester of isotriadecanool and stearic acid (e.g., isotriadecanool stearate) may be used as component (a). However, the types of component (a) that can be used are not limited thereto.

[0153] As described below, the amount of component (a) contained in the emulsion can be controlled, taking into account the function of the emulsion or the function of component (a).

[0154] Component (b), namely ester of sorbitol and fatty acids having more than 16 carbon atoms, is a compound that can be used as a type of emulsifier and can be a component that is harmless to humans and suitable for use in food.

[0155] Component (b) possesses both hydrophobic and hydrophilic properties due to its polyol composition (i.e., sorbitol), which allows component (a), which imparts lubrication to the fibers, to disperse well in water as described below. Furthermore, the combined use of components (a) and (b) not only increases the dispersibility of the emulsion as described above but also lowers its melting point, thereby ensuring the emulsion's ease of use, processability, and stability. Considering these properties, the amount of component (b) can be controlled as described below.

[0156] There are no particular restrictions on the types of fatty acids with 16 or more carbon atoms that form component (b). Fatty acids with 16 or more carbon atoms may be used, provided that they provide sufficient esters that are harmless to humans for use in food.

[0157] For example, fatty acids with more than 16 carbon atoms can be saturated fatty acids and / or unsaturated fatty acids.

[0158] Examples of saturated fatty acids may include palmitic acid (hexadecanoic acid, CH3(CH2)). 14 COOH), pearlitic fatty acid (heptadecanoic acid, CH3(CH2) 15 COOH), stearic acid (octadecanoic acid, CH3(CH2)16 COOH), nonadecanoic acid (nonadecanoic acid, CH3(CH2)) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2)). 18 (COOH). However, the types of saturated fatty acids available are not limited to this.

[0159] Examples of unsaturated fatty acids can include 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). However, the types of unsaturated fatty acids available are not limited to this.

[0160] In some embodiments, the fatty acids are selected from the group consisting of palmitic acid, pearlitic acid, stearic acid, nonadecanic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid, and arachidonic acid.

[0161] There is no particular limit to the number of carbon atoms in fatty acids with 16 or more carbon atoms, but it can be, for example, below 40, 36, 32, 28, 24 or 20.

[0162] In some embodiments, an ester of sorbitol and oleic acid (e.g., sorbitol monooleate) may be used as component (b). However, the types of component (b) that can be used are not limited thereto.

[0163] Considering the functions of component (b) and the emulsion as described above, the amount of component (b) can be controlled.

[0164] In one example, relative to 100 parts by weight of (a) an ester of fatty acids having 16 or more carbon atoms and an aliphatic monohydric alcohol, the emulsion may contain 20 to 60 parts by weight of (b) an ester of sorbitol and fatty acids having 16 or more carbon atoms.

[0165] Specifically, relative to 100 parts by weight of component (a), the emulsion of this disclosure may contain 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 of component (b). Furthermore, relative to 100 parts by weight of component (a), the upper limit of the amount of component (b) may be, for example, less than 55 parts by weight, less than 50 parts by weight, less than 45 parts by weight, less than 40 parts by weight, less than 35 parts by weight, less than 30 parts by weight, or less than 25 parts by weight. When the amount is within the above range, the surface of the emulsified Lyocell multifilaments or Lyocell tows may be hydrophobic.

[0166] In one example, based on 100% by weight of the total emulsion, the emulsion may contain 40 to 80% by weight of (a) an ester of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol. Specifically, based on 100% by weight of the total emulsion, the amount of component (a) may be 45% or more, 50% or more, 55% or more, 60% or more, 65% or more, 70% or more, or 75% or more. Furthermore, the upper limit of its amount may be, for example, less than 75% by weight, less than 70% by weight, less than 65% by weight, less than 60% by weight, less than 55% by weight, less than 50% by weight, or less than 45% by weight.

[0167] In one instance, the emulsion may contain an excess of component (a).

[0168] In one example, based on 100% by weight of the total emulsion, the emulsion may contain 15 to 55% by weight of (b) dehydrated sorbitol and esters of fatty acids having 16 or more carbon atoms. Specifically, based on 100% by weight of the total emulsion, the amount of component (b) may be 20% or more, 25% or more, 30% or more, 35% or more, 40% or more, 45% or more, or 50% or more. Furthermore, the upper limit of its amount may be, for example, less than 50% by weight, less than 45% by weight, less than 40% by weight, less than 35% by weight, less than 30% by weight, or less than 25% by weight.

[0169] In one instance, the emulsion may further include water. A small amount of water can facilitate processing with the emulsion.

[0170] There is no particular limitation on the amount of water, but it can include water in the amount remaining after the total amount of components (a) and (b) is excluded from 100% by weight of the total emulsion. The amount of water in the emulsion (i.e., the amount remaining excluding the total amount of the remaining components other than water) can be, for example, less than 10% by weight, less than 9% by weight, less than 8% by weight, less than 7% by weight, less than 6% by weight, less than 5% by weight, less than 4% by weight, less than 3% by weight, less than 2% by weight, or less than 1% by weight. In addition, its lower limit can be, for example, more than 0% by weight, more than 0.1% by weight, more than 0.5% by weight, or more than 1% by weight.

[0171] [Methods for manufacturing Lyocell material]

[0172] This disclosure relates to a method for manufacturing lyocell material. This method allows the manufacture of lyocell material for use in smoking articles.

[0173] Specifically, a method for manufacturing lyocell material may include: spinning a lyocell spinning dope; coagulating the spun lyocell spinning dope to obtain lyocell multifilament; washing the lyocell multifilament; treating the lyocell multifilament with an emulsion; and crimping the lyocell multifilament. Furthermore, the method for manufacturing lyocell material may also include adhesive treatment; and other steps. In some embodiments, these steps are performed in the order mentioned.

[0174] Emulsion treatment can be performed before, after, or both before and after curling.

[0175] Emulsion treatment can be performed independently, for example, by spraying an emulsion having the above composition onto lyocell multifilaments or by impregnating lyocell multifilaments into an emulsion. As described above, the emulsion can be treated such that the amount of emulsion in the lyocell material (e.g., OPU (wt%)) is within a certain range.

[0176] Crimping can be done, for example, by applying steam and / or pressure to the lyocell multifilament.

[0177] The method for manufacturing lyocell material according to some embodiments, including emulsion treatment and coiling, will now be described in more detail. The method disclosed herein can be performed by including one or more of the steps described below.

[0178] <(a) Spinning Lyocell spinning solution>

[0179] This step involves spinning a lyocell spinning solution containing lyocell cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0180] Commercially available cellulose acetate filters are considered a major cause of microplastics. However, because the amine oxide solvents used to manufacture lyocell fibers are recyclable and biodegradable upon disposal, lyocell materials do not generate any pollutants during their manufacturing process. Furthermore, because lyocell filaments are biodegradable and can be removed in a relatively short time, lyocell is a more environmentally friendly material than cellulose acetate.

[0181] In one example, based on a total spinning solution of 100% by weight, the amount of cellulose in the spinning solution can be from 5% to 15% by weight. When the amount of cellulose is too low, it is difficult to utilize the properties of lyocell fiber, while when the amount of cellulose exceeds the above range, it is difficult to dissolve the cellulose in the solvent. With this in mind, based on a total spinning solution of 100% by weight, the amount of cellulose in the spinning solution can be 6% or more, 7% or more, 8% or more, 9% or more, or 10% or more, and the upper limit based on a total spinning solution of 100% by weight can be, for example, less than 14% by weight, less than 13% by weight, less than 12% by weight, less than 11% by weight, less than 10% by weight, or less than 9% by weight. The term "cellulose" can refer to "lyocell cellulose".

[0182] In one example, the spinning solution may include an aqueous solution of N-methylmorpholine-N-oxide (NMMO). Taking into account the degree of cellulose solubility and process temperature, the aqueous solution may include, for example, 80 to 95% by weight of N-methylmorpholine-N-oxide and 5 to 20% by weight of water.

[0183] In one instance, relative to 100% by weight of total cellulose and / or cellulose pulp, the cellulose or cellulose pulp may have an amount of 85% by weight to 97% by weight of α-cellulose.

[0184] In one example, relative to 100% by weight of total cellulose and / or cellulose pulp, the cellulose or cellulose pulp may contain between 1% by weight and 15% by weight of hemicellulose. By controlling the amount of hemicellulose within the aforementioned range, it is easier to ensure stable physical properties (e.g., the achievement of hardness or suction resistance) and processability of the lyocell material.

[0185] Furthermore, in some embodiments, the degree of polymerization (DPw) of cellulose can be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of cellulose and / or α-cellulose and / or hemicellulose in the cellulose pulp.

[0186] In spinning, the shape of the spinneret used to discharge the spinning solution is not particularly limited. For example, an annular spinneret can be used.

[0187] The nozzle temperature of the spinneret, especially the spinning temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the spinning solution can vary with the spinning temperature, which can lead to poor discharge, the spinning temperature can be, for example, 100°C to 120°C, or 100°C to 110°C.

[0188] In one example, spinning of the spinning solution can be carried out under controlled spinning conditions, such that the fineness of the filament monofilament can be from 1.67 to 8.89 dtex (1.5 denier to 8.0 denier). For example, one or more spinning conditions, such as the discharge rate of the spinning solution and the spinning speed, can be appropriately controlled so that the fineness of the filament monofilament included in the lyocell material is from 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this context, the fineness of the filament monofilament refers to the fineness of a single monofilament separated from the multifilament.

[0189] Specifically, the fineness of the monofilament can be specifically below 8.33 dtex (7.5 denier), below 7.78 dtex (7.0 denier), below 7.22 dtex (6.5 denier), below 6.67 dtex (6.0 denier), below 6.11 dtex (5.5 denier), below 5.56 dtex (5.0 denier), below 5.00 dtex (4.5 denier), below 3.89 dtex (3.5 denier), below 3.33 dtex (3.0 denier), below 2.78 dtex (2.5 denier), or below 2.22 dtex (2.0 denier). Furthermore, the lower limit can specifically be 2.22 dtex (2.0 denier) or higher, 2.78 dtex (2.5 denier) or higher, 3.33 dtex (3.0 denier) or higher, 3.89 dtex (3.5 denier) or higher, 4.44 dtex (4.0 denier) or higher, 5.00 dtex (4.5 denier) or higher, 5.56 dtex (5.0 denier) or higher, 6.11 dtex (5.5 denier) or higher, 6.67 dtex (6.0 denier) or higher, 7.22 dtex (6.5 denier) or higher, or 7.78 dtex (7.0 denier) or higher. Meeting the above ranges may be more advantageous in achieving stable suction resistance and ensuring the processability of filters for smoking products.

[0190] The spinning solution discharged through the spinneret can be solidified as described below.

[0191] <(b) Solidification and Obtaining Multifilament>

[0192] In this step, the spun lyocell spinning solution is solidified, and lyocell multifilament is obtained.

[0193] Coagulation can be carried out by contacting the spinning solution with air and / or coagulation solution.

[0194] In one example, the coagulation may include: primary coagulation by supplying cooling air to the spun lyocell spinning solution; and secondary coagulation by introducing the primary coagulated spinning solution into the coagulating solution to cause it to coagulate.

[0195] Depending on the solidification method, the lyocell spinning solution discharged from the spinneret can be solidified in a single step within the space (air gap) between the spinneret and the solidification tank. In this air gap, cooling air can be supplied from inside the spinneret to the outside via an air cooling section located inside the spinneret. Alternatively, single solidification can be achieved through a so-called air quenching method or other methods known in the relevant field.

[0196] In one instance, the upper limit of the temperature of the cooling air used in a single solidification step may be, for example, below 15°C. Specifically, the cooling air may be air with a temperature below 14°C, below 13°C, below 12°C, below 11°C, or below 10°C. Above these temperatures, the spinning solution may not be sufficiently solidified by the air, and the processability associated with spinning may be poor.

[0197] The lower limit of the cooling air temperature can be determined by taking into account spinning processability and / or the cross-sectional uniformity of the filament. For example, when the cooling air temperature is below 4°C, the spinneret surface is cooled, the filament surface becomes uneven, and spinning processability deteriorates. Taking this into account, the cooling air temperature can be above 5°C, above 6°C, above 7°C, above 8°C, or above 9°C.

[0198] The supply of cooling air can be controlled to take into account adequate coagulation, spinning processing, and its impact on the physical properties of the filament. For example, the cooling air supply can range from 70 to 400 Nm. 3 The airflow rate at the spinneret is / h / to supply the discharged spinning solution. Specifically, the airflow rate can be 100 Nm. 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or above, or 250 Nm 3 / h or higher, and the upper limit of airflow can be, 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 and below.

[0199] After the initial coagulation as described above, the cooled spinning solution can be supplied to a coagulation tank or coagulation vessel containing the coagulating solution (secondary coagulation). For proper coagulation, the temperature of the coagulating solution can be, for example, below 30°C or below 25°C. Alternatively, the temperature of the coagulating solution can be above 10°C, above 15°C, or above 20°C. When maintaining the temperature, the coagulation rate can be appropriately maintained.

[0200] There are no particular limitations on the type of coagulant used for secondary coagulation as described above. For example, the coagulant may include one or more of water and N-methylmorpholine-N-oxide (NMMO).

[0201] While there are no particular limitations, when the coagulant includes water and NMMO, the amount of water in the coagulant can be 60 to 90% by weight and the amount of NMMO in the coagulant can be 10 to 40% by weight, based on 100% by weight of the total coagulant. Alternatively, the coagulant can contain 70 to 80% by weight of water and 20 to 30% by weight of NMMO, based on 100% by weight of the total coagulant. The concentration of the coagulant can be controlled using sensors or the like to maintain that concentration during the manufacturing process.

[0202] <(c) Washing>

[0203] If necessary, the Lyocell multifilament can be washed after coagulation and obtaining the multifilament as described above. This washing can remove residual NMMO and / or other impurities from the filament.

[0204] There are no particular limitations on the washing method. For example, the solidified lyocell multifilament can be washed by using a traction roller to guide it into the washing tank. Alternatively, the washing can be performed by spraying washing liquid as the traction roller moves the yarn to the next stage.

[0205] There are no particular limitations on the composition of the washing liquid. For example, the washing liquid may include water and may further include known additives.

[0206] Furthermore, considering the reuse after washing, the washing liquid can be controlled at a temperature below 100°C and used at that temperature.

[0207] For example, when obtaining Lyocell multifilament includes drawing the Lyocell multifilament through a first roller, and washing includes drawing the Lyocell multifilament through a second roller, the moisture content of the Lyocell multifilament can be controlled by the ratio of the rotational speed of the second roller to the rotational speed of the first roller. In some embodiments, the rotational speed of the first roller may be different from the rotational speed of the second roller. In some embodiments, the rotational speed of the second roller may be greater than the rotational speed of the first roller. Furthermore, the drawing of the Lyocell multifilament during washing can be performed by one or more rollers, and when the drawing of the Lyocell multifilament during washing is performed by more than two rollers, the second roller may be the last roller.

[0208] The toughness and elongation of lyocell multifilament can be controlled by adjusting the ratio of the rotational speed of the second roller to that of the first roller. Specifically, the ratio can be between 1.00 and 1.15. When the ratio is less than 1.00, the crimping properties of the lyocell multifilament may deteriorate due to a decrease in modulus caused by increased toughness of the monofilament. Conversely, when the ratio exceeds 1.15, the toughness of the monofilament may decrease, and the crimping shape stability of the lyocell multifilament may also decrease.

[0209] In some embodiments, the method of manufacturing lyocell material further includes pressurizing the lyocell multifilament, and the pressurization can be performed between washing and crimping. While there are no particular limitations, the pressurization of the lyocell multifilament can reach 29.42 N / cm. 2 Up to 34.33 N / cm 2 (3.0 kgf / cm 2 Up to 3.5 kgf / cm 2 (This will be carried out below.)

[0210] The moisture content of Lyocell multifilaments can be controlled as described above by applying pressure to them.

[0211] <(d) Emulsion Treatment>

[0212] If necessary, emulsification of the lyocell multifilament can be performed. This step involves applying an emulsion containing the above-described components to the surface of the filament. Emulsion treatment reduces friction applied to the filament and allows for good crimping during the crimping process described below. When the emulsion treatment is performed more than twice as described below, depending on the sequence, the emulsion treatment can be referred to as a single emulsion treatment or a double emulsion treatment.

[0213] While there are no particular limitations, emulsion treatment can be performed by immersing the Lyocell multifilament in a tank filled with emulsion, ensuring the Lyocell multifilament is completely submerged in the emulsion. Alternatively, emulsion treatment can be performed by spraying emulsion onto the traction roller as it moves to the next stage.

[0214] To ensure that the amount of emulsion applied to the Lyocell multifilament after the emulsion treatment described above is constant, an additional method can be used, wherein rollers positioned before and / or after the emulsion treatment extrude the emulsion from the surface of the Lyocell multifilament.

[0215] In one example, an emulsion treatment can be performed such that, based on 100% by weight of at least one emulsion-treated lyocell multifilament, the amount of emulsion (OPU: oil absorption rate (wt%)) is 1.0% by weight or more. In this regard, for at least emulsified lyocell multifilaments, for example, the lyocell material can be a lyocell multifilament that has undergone one emulsion treatment, a lyocell multifilament that has undergone one and two emulsion treatments (see description below), or a lyocell multifilament that has undergone the adhesive treatment described below and the emulsion treatment as described above. Furthermore, the lyocell multifilaments that have undergone the emulsion treatment and / or adhesive treatment as described above can be crimped.

[0216] Specifically, based on a total amount of at least 100% by weight of emulsified Lyocell multifilaments, the amount of emulsion in the at least emulsified Lyocell multifilaments can be 0.5% by weight or more, 1.0% by weight or more, 1.5% by weight or more, 2.0% by weight or more, 2.5% by weight or more, 3.0% by weight or more, particularly 3.5% by weight or more, 4.0% by weight or more, 4.2% by weight or more, 4.5% by weight or more, 5.0% by weight or more, 5.5% by weight or more, 6.0% by weight or more, 6.5% by weight or more, 7.0% by weight or more, 7.5% by weight or more, 8.0% by weight or more, 8.5% by weight or more, 9.0% by weight or more, or 9.5% by weight or more. Furthermore, based on 100% by weight of at least one emulsified lyocell multifilament, the upper limit can be, in particular, less than 20.0% by weight, less than 18.0% by weight, less than 17.0% by weight, less than 16.0% by weight, less than 15.0% by weight, less than 14.5% by weight, less than 14.0% by weight, less than 13.5% by weight, less than 13.0% by weight, less than 12.5% ​​by weight, less than 12.0% by weight, less than 11.5% by weight, less than 11.0% by weight, less than 10.5% by weight, less than 10% by weight, less than 9.5% by weight, less than 9.0% by weight, less than 8.5% by weight, less than 8.0% by weight, less than 7.8% by weight, or less than 7.6% by weight. In this context, the amount can refer to the dry weight of the solvent (e.g., water) or liquid component that may be contained in the emulsion after evaporation.

[0217] When processing emulsions with the above composition within the above dosage range, the hydrophilic properties of Lyocell materials can be supplemented.

[0218] In some cases, the drying of the emulsion can be carried out after the emulsion treatment described above.

[0219] In some implementations, one or more of the above steps can be controlled such that the fineness of the monofilaments forming the lyocell multifilament can be 1.67 to 8.89 deniers (1.5 to 8.0 deniers). The fineness of a monofilament refers to the fineness of a single monofilament separated from the multifilament.

[0220] Specifically, the fineness of the monofilament can be, for example, below 8.33 dtex (7.5 denier), below 7.78 dtex (7.0 denier), below 7.22 dtex (6.5 denier), below 6.67 dtex (6.0 denier), below 6.11 dtex (5.5 denier), below 5.56 dtex (5.0 denier), below 5.00 dtex (4.5 denier), below 3.89 dtex (3.5 denier), below 3.33 dtex (3.0 denier), below 2.78 dtex (2.5 denier), or below 2.22 dtex (2.0 denier). Additionally, the lower limit can be, for example, 2.22 dtex (2.0 denier) or higher, 2.78 dtex (2.5 denier) or higher, 3.33 dtex (3.0 denier) or higher, 3.89 dtex (3.5 denier) or higher, 4.44 dtex (4.0 denier) or higher, 5.00 dtex (4.5 denier) or higher, 5.56 dtex (5.0 denier) or higher, 6.11 dtex (5.5 denier) or higher, 6.67 dtex (6.0 denier) or higher, 7.22 dtex (6.5 denier) or higher, or 7.78 dtex (7.0 denier) or higher. Meeting the above ranges may be more advantageous in achieving stable suction resistance and ensuring processability of filters for smoking products.

[0221] Although there are no particular limitations, the steps for controlling the process to ensure the range of monofilament fineness as described above can be spinning. Alternatively, the spinning, coagulation, washing, and emulsion treatment described above can be controlled to ensure the range of monofilament fineness as described above.

[0222] Furthermore, in some embodiments, the moisture content of the lyocell multifilaments can be controlled before crimping them during the manufacturing of the lyocell material. Therefore, crimping can be imparted to lyocell multifilaments with controlled moisture content, and the elongation and toughness of the lyocell material can be controlled as a result of crimping. Consequently, the shape stability of the crimped lyocell material can be maintained within a certain range.

[0223] In some embodiments, the method of manufacturing lyocell material further includes pressurizing the lyocell multifilament, and the pressurization can be performed between emulsion treatment and crimping. While there are no particular limitations, the pressurization of the lyocell multifilament can reach 29.42 N / cm. 2 Up to 34.33 N / cm 2 (3.0 kgf / cm 2 Up to 3.5 kgf / cm 2 (This will be carried out below.)

[0224] The moisture content of Lyocell multifilaments can be controlled as described above by applying pressure to them.

[0225] <(e) Curl>

[0226] The application of crimp is achieved by applying steam and / or pressure to emulsified lyocell multifilaments using pressure rollers to obtain crimped multifilaments, preferably crimped tows. The application of crimp may be referred to as crimping. As used herein, the terms "treated with emulsion" and "emulsified" are used interchangeably.

[0227] Crimping imparts a wave-like shape to lyocell multifilaments, giving the fibers a fluffy texture. Crimping can be performed using known crimping devices, such as crimping devices that include a stuffer box and / or a steam box, and there are no particular limitations on the crimping devices that can be used, as long as they are capable of applying one or more of the pressures described below.

[0228] In one instance, crimping can be performed on lyocell multifilaments whose moisture content has been controlled by washing or emulsion treatment.

[0229] In one instance, crimping can be performed in such a way that pressure is applied to the Lyocell multifilament by pressure rollers and steam is applied simultaneously.

[0230] In one example, crimping can be achieved by applying 0.98 to 19.61 N / cm to the Lyocell multifilament before it is introduced into the crimping device (particularly the pressure rollers). 2 (0.1 to 2.0 kgf / cm) 2 It is carried out using steam.

[0231] In one instance, crimping can be achieved by applying pressure to the Lyocell multifilament with pressure rollers to create wrinkles in the Lyocell multifilament.

[0232] In one example, crimping can be achieved by applying 14.71 to 39.23 N / cm to the Lyocell multifilament introduced into the crimping device using pressure rollers. 2 (1.5 to 4.0 kgf / cm) 2 It is under pressure to carry out this process.

[0233] For example, 15.69 N / cm can be applied to Lyocell multifilament by pressure rollers. 2 (1.6 kgf / cm 2 Above 16.67 N / cm 2 (1.7 kgf / cm 2 Above 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 / cm2 (2.0 kgf / cm 2 Above 20.60 N / cm 2 (2.1 kgf / cm 2 Above 21.58 N / cm 2 (2.2kgf / 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 above, or 24.52 N / cm 2 (2.5 kgf / cm 2 The pressure can be above 38.25 N / cm. Alternatively, a pressure roller can be used to apply pressure. 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 (3.1kgf / 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 Below 25.50 N / cm2 (2.6 kgf / cm 2 Below ) or 24.52 N / cm 2 (2.5 kgf / cm 2 The pressure below.

[0234] When the pressure of the pressure roller is below the aforementioned range, the required number of crimps may not be formed sufficiently. Conversely, when the pressure of the roller exceeds the aforementioned range, the pressure may be too strong, and the filament may not be smoothly introduced into the crimping device or may not pass through the crimping device at all. By providing pressure rollers within the aforementioned range, wrinkles can be formed in the Lyocell multifilament.

[0235] In one instance, the range from 0.98 to 19.61 N / cm can be achieved by using the upper plate. 2 (0.1 to 2 kgf / cm) 2 The pressure is applied to the Lyocell multifilament. Additionally, the upper plate can apply pressure to the Lyocell multifilament as it passes through or is passing through the pressure rollers.

[0236] For example, the pressure applied to the upper plate could be 1.96 N / cm. 2 (0.2 kgf / cm 2 Above 2.94 N / cm 2 (0.3kgf / cm 2 Above 3.92 N / cm 2 (0.4 kgf / cm 2 ) or above, or 4.90 N / cm 2 (0.5 kgf / cm 2 Above that. In addition, 14.71 N / cm can be applied to the upper plate. 2 (1.5 kgf / cm 2 Below, 13.73 N / cm 2 (1.4 kgf / cm 2 Below 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 Below 9.81 N / cm 2 (1.0 kgf / cm 2 The pressure below.

[0237] Furthermore, the pressure applied to the upper plate as it moves up and down after passing through the pressure rollers to provide uniform curling is less than 0.98 N / cm.2 (0.1kgf / cm) 2 When the pressure on the upper plate exceeds 19.61 N / cm, the upper plate may fail to hold its position due to the internal pressure of the winding device, causing the filament bundle to remain in the winding device for an extended period, thus preventing the continuity of the process. 2 (2 kgf / cm 2 When steam cannot be discharged smoothly from the coiling device, the coiled shape becomes irregular.

[0238] In one example, crimping may include applying a doctor blade that applies pressure to the lyocell multifilament. The doctor blade controls the residence time of the filament being introduced into the crimping machine, thereby helping to control the number of crimps. Such a doctor blade can be located, for example, in the path where the lyocell multifilament is squeezed by the rollers and then discharged at the pressure point of the rollers.

[0239] In one example, crimping can be achieved by applying 0.98 to 19.61 N / cm to the Lyocell multifilament passing through the rollers of the crimping device using a doctor blade. 2 (0.1 to 2.0 kgf / cm) 2 It is under pressure to carry out this process.

[0240] For example, the pressure applied by the scraper can be 1.96 N / cm. 2 (0.2 kgf / cm 2 Above 2.94 N / cm 2 (0.3kgf / cm 2 Above 3.92 N / cm 2 (0.4 kgf / cm 2 ) or above, or 4.90 N / cm 2 (0.5 kgf / cm 2 Above that. Additionally, the scraper can apply 14.71 N / cm. 2 (1.5 kgf / cm 2 Below, 13.73 N / cm 2 (1.4 kgf / cm 2 Below 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 Below ) or 9.81 N / cm 2 (1.0 kgf / cm 2The pressure below.

[0241] In one example, curling can be performed at temperatures ranging from 120 to 250°C. When the temperature is too low, the shape stability of the curl may be poor, while when the temperature is too high, the concentration of the oil component in the curling apparatus may increase, making curl formation difficult. Therefore, considering the aforementioned steam pressure, the temperature can be appropriately controlled within a range of 130°C or higher, 140°C or higher, or 150°C or higher, and within a range of 200°C or lower, 180°C or lower, or 160°C.

[0242] <(f) Adhesive Treatment>

[0243] In one instance, the method may further include adhesive treatment of emulsified Lyocell multifilament or Lyocell multifilament obtained by crimping.

[0244] When manufacturing filters for smoking products using lyocell materials (e.g., lyocell tow), an adhesive may be used additionally. The adhesive increases the rigidity of the filter, which includes the lyocell material, thereby preventing problems such as filter clogging during the filter manufacturing process or cigarette manufacturing process.

[0245] There are no particular limitations on the method of applying adhesive to Brexell materials. For example, emulsion treatment can be carried out by immersing Brexell multifilaments in a tank filled with adhesive (or adhesive solution) so that the Brexell multifilaments are completely immersed in the adhesive. Alternatively, the adhesive can be injected (or sprayed) into Brexell multifilaments through a nozzle.

[0246] The types and components of available adhesives are as described above, so they are omitted.

[0247] In one example, in addition to the components described above, the adhesive (or adhesive solution) may also contain a solvent. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin. When the adhesive (or adhesive solution) includes a solvent, the solvent content may be, for example, about 20 to 80% by weight, or 40 to 60% by weight, based on 100% by weight of the total adhesive (or adhesive solution).

[0248] Adhesive treatment can be performed at a level that achieves the aforementioned adhesive treatment objectives. For example, adhesive treatment can be performed such that, based on 100% by weight of emulsified and adhesive-treated Lyocell multifilament, the amount of adhesive is less than 20% by weight, for example, 8 to 15% by weight. In this context, the amount can refer to the dry weight of the solvent or liquid components that may be contained in the adhesive after evaporation.

[0249] After applying the adhesive to the Brassell multifilament, the adhesive can be dried. There are no particular restrictions on the drying temperature, but drying can be carried out, for example, at room temperature (approximately 10 to 35°C).

[0250] <(g) Other steps>

[0251] After curling, appropriate post-processing can be performed.

[0252] In one example, a secondary emulsion treatment (g1) may be performed. This secondary emulsion treatment imparts greater flexibility to the filament bundle. The secondary emulsion treatment can be performed in the same manner as or in accordance with the emulsion treatment described in (d) above.

[0253] In particular, secondary emulsion treatment can be performed by applying an emulsion to lyocell tow that has already undergone a crimping process. This can be advantageously used in various processes performed in the manufacture of filters for smoking products. For example, secondary emulsion treatment helps ensure that the fibers and filters are airtight during spreading, while also limiting fiber breakage during stretching.

[0254] The secondary emulsion treatment described above can be performed before or after the adhesive treatment. Alternatively, the secondary emulsion treatment can be performed with or without adhesive treatment.

[0255] Even when performing the secondary emulsion treatment as described above, the secondary emulsion treatment can still be performed so that the amount of emulsion or OPU in the material is within the range described above.

[0256] In one instance, a drying process (g2) may be performed additionally. Drying may be carried out, for example, at a temperature in the range of 100 to 130°C. The method or approach to drying is not particularly limited, and known techniques may be used. For example, this can be achieved by applying hot air to the yarn bundle, passing the yarn bundle through a temperature-controlled chamber, or leaving the yarn bundle in a temperature-controlled chamber for a certain period of time.

[0257] The lyocell material according to this disclosure can be obtained by the method of manufacturing lyocell material as described above.

[0258] According to this disclosure, the lyocell material can be a material that can be obtained by the method of manufacturing lyocell material as described above.

[0259] [Smoking products]

[0260] Although there are no particular limitations, lyocell materials manufactured by this method can be included in smoking articles. Smoking articles can be aerosol-generating articles. Aerosol-generating articles can include aerosol-generating materials or aerosol-forming matrices.

[0261] For example, lyocell material may be included in combustible cigarettes. As another example, lyocell material may be included in heated cigarettes, and these heated cigarettes may be used in conjunction with aerosol generating devices.

[0262] For example, when used as a heated smoking article, the smoking article can be inserted separately into the aerosol generating device. Here, the aerosol generating device includes a container capable of accommodating the aerosol generating article, and may further include a heater for heating the aerosol generating article to generate aerosol, a control unit for overall control of the operation of the aerosol generating device, a battery for providing power for operating the aerosol generating device, and a detector for identifying that the aerosol generating article has been inserted into the aerosol generating device.

[0263] A smoking article may include a tobacco medium, a filter for the smoking article, and a wrapping paper, wherein the filter for the smoking article may be located at one end of the tobacco medium, for example, at the rear or front end of the tobacco medium. The tobacco medium and the filter for the smoking article may each include a single segment, or may each independently include multiple segments.

[0264] The tobacco medium portion includes tobacco substances, including nicotine. Additionally, the tobacco medium portion may further include one or more excipients.

[0265] Excipients may include binders, fillers, and other additives. For example, tobacco media contained in the tobacco medium portion may be manufactured in the form of particles containing tobacco substances and excipients.

[0266] For example, fillers may be additionally included to maintain the constant shape, strength, and quality of the tobacco media portion. Lyocell material may be included in the tobacco media portion, for example. Furthermore, lyocell material can be used as a filler.

[0267] Packaging paper can be further divided into cigarette paper that wraps the tobacco media, filter paper that wraps the filter, and tipping wrapper that combines the tobacco media and the filter.

[0268] [Filters for smoking products]

[0269] Lyocell material can be used in filters for smoking products. Lyocell material can be a tow of lyocell fibers. In one example, a tow of lyocell fibers comprises crimped lyocell multifilaments.

[0270] For example, this disclosure relates to a filter for smoking articles. The filter for smoking articles includes a lyocell material, and the lyocell material may be the same as described above. Furthermore, the filter for smoking articles may include a lyocell tow, and the lyocell tow may be the same as described above.

[0271] Furthermore, relative to 100% by weight of all Lyocell material, the Lyocell material includes an emulsion of 0.1% by weight or more. Additionally, the description of the components and amounts of the emulsion according to some embodiments is the same as described above.

[0272] In some embodiments, the fineness of the monofilament forming the lyocell multifilament can be from 1.67 to 8.89 denier (1.5 to 8.0 denier). The specific values ​​are the same as those described above.

[0273] In some embodiments, the crimped lyocell multifilaments may be lyocell material with a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier), preferably, the lyocell material may be lyocell tow. Specific values ​​are the same as those described above.

[0274] In one example, the crimped lyocell multifilament can have 3.94 to 19.69 crimps per centimeter (10 to 50 crimps per inch). The specific values ​​are the same as those mentioned above.

[0275] In one example, a filter for smoking products may further include an adhesive on or between the curled lyocell multifilaments. The adhesive can increase the rigidity of the filter for smoking products made from the tow, thereby preventing problems such as filter clogging during the filter manufacturing process or the cigarette manufacturing process. The types, components, and amounts of available adhesives are described as above.

[0276] In one instance, a filter for a smoking product may further include wrapping paper (which may be referred to as roll paper, filter paper, or filter wrapping paper). For example, the wrapping paper may wrap the aforementioned lyocell filaments and may be porous or non-porous paper that can maintain the shape of the filter (e.g., a column or cylinder).

[0277] In some embodiments, the filter for smoking products may have a specific shape and size.

[0278] For example, the filter can be rod-shaped. In particular, the filter for smoking products can be cylindrical.

[0279] In addition, the filter can have a length of, for example, 10 to 50 mm. Specifically, the length of the filter can have a lower limit of more than 15 mm, more than 20 mm, more than 25 mm, more than 30 mm, more than 35 mm, more than 40 mm or more than 45 mm, and an upper limit of less than 45 mm, less than 40 mm, less than 35 mm, less than 30 mm, less than 25 mm, less than 20 mm or less than 15 mm.

[0280] In some embodiments, a filter having a length within the above range may have a circular cross-section, and the perimeter of the circular cross-section may be 10 to 40 mm. For example, the perimeter 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, or 35 mm or more, and an upper limit of less than 35 mm, less than 30 mm, less than 25 mm, less than 20 mm, or less than 15 mm.

[0281] In one example, a filter for a smoking product may include lyocell tow and filter wrapping paper. The description of the lyocell tow and filter wrapping paper is the same as above, and therefore omitted.

[0282] The wrapping paper can wrap the aforementioned lyocell filament bundles and can be porous or non-porous paper, which can maintain the shape of the filter (e.g., column or cylinder).

[0283] In one example, when using porous packaging paper, the paper can have a porosity of 10 to 50,000 CU (Coresta Unit). A Coresta Unit can be defined as the amount of material passing through a 1 cm² column under a pressure difference of 1 kPa. 2 The air volume velocity (cm) of the substrate sample (i.e., porous packaging paper) 3 min -1 Specifically, the lower limit of the porosity of the packaging paper can be, for example, 1,000 CU or more, 5,000 CU or more, 10,000 CU or more, 15,000 CU or more, 20,000 CU or more, 25,000 CU or more, 30,000 CU or more, 35,000 CU or more, 40,000 CU or more, or 45,000 CU or more, and its upper limit can be, for example, less than 45,000 CU, less than 40,000 CU, less than 35,000 CU, less than 30,000 CU, less than 25,000 CU, or less than 20,000 CU. In some embodiments, the packaging paper may have a porosity in the range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0284] In one example, the basis weight of the packaging paper can be from 15 to 60 g / cm³. 2 Specifically, the lower limit of the basis weight of the packaging paper can be, for example, 20 g / cm³. 2 Above, 25g / cm 2 Above, 30g / cm 2 Above, 35g / cm 2 Above, 40g / cm 2 Above, 45g / cm 2 Above, 50g / cm 2Above, or 55g / cm 2 The above, and its upper limit can be, for example, 55g / cm³. 2 Below, 50g / cm 2 Below, 45g / cm 2 Below, 40g / cm 2 Below, 35g / cm 2 Below, 30g / cm 2 Below, 25g / cm 2 Below, or 20g / cm 2 The following is an example. In some embodiments, the basis weight of the packaging paper may be 16 g / cm³. 2 Above, 17g / cm 2 Above, 18g / cm 2 Above, 19g / cm 2 Above, 20g / cm 2 Above, or 21g / cm 2 The above, and 25g / cm 2 Below, 24g / cm 2 Below, 23g / cm 2 Below, 22g / cm 2 Below, or 21g / cm 2 the following.

[0285] Although there are no particular restrictions, the weight of a rod filter can be 50 mg or more. Specifically, the weight of the filter can 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 less than 500 mg, 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.

[0286] The description of filters for other smoking products and the materials included therein is the same as above, and therefore they are omitted.

[0287] [Manufacturing method for filters used in smoking products]

[0288] For example, this disclosure relates to a method for manufacturing a filter for smoking articles. This method is a method for manufacturing a lyocell filter for smoking articles as described above, and may include a method for manufacturing the lyocell material as described above.

[0289] Regarding the method for manufacturing filters for smoking products, the remaining processes are the same as those described above for the process used for lyocell material; therefore, their description is omitted. Furthermore, any descriptions overlapping with the above are also omitted.

[0290] The filter can be manufactured appropriately by those skilled in the art according to known methods. For example, the filter can be manufactured by forming a bar shape from packaging paper filled with lyocell material. Alternatively, the filter can be manufactured by cutting a bar-shaped filter paper filled with lyocell material into segments of appropriate length. The packaging paper is described above.

[0291] While there are no particular restrictions, Lyocell material can be additionally plasticized or opened before being used to fill filter paper. The surface area of ​​Lyocell material can be increased by opening it. For example, opening can be achieved by applying external forces in the length, width, and / or thickness directions.

[0292] Preferably, the lyocell material used to manufacture filters for smoking products can be lyocell filaments.

[0293] While there are no particular limitations, filters for smoking articles may additionally include known cellulose acetate multifilaments, provided that this does not impair the purposes of this disclosure. Cellulose acetate multifilaments may be blended with lyocell multifilaments. Cellulose acetate multifilaments may be included in sections different from those including lyocell multifilaments.

[0294] Beneficial effects of the invention

[0295] According to this disclosure, a lyocell material for filters used in smoking products is provided as an alternative to commercially available cellulose acetate (CA), and a filter for smoking products comprising the lyocell material is also provided. In particular, by using a lyocell material with a certain degree of curl shape stability, the performance of the filter for smoking products is improved, and the time and cost required to manufacture the filter for smoking products can be reduced. Detailed Implementation

[0296] The operation and effects of this disclosure will be described in more detail below through specific embodiments thereof. However, this is presented as an example of this disclosure, and the scope of this disclosure is not limited thereto in any way.

[0297] Lyocell materials are prepared by the same method described in the following manufacturing examples. Any conditions not specifically mentioned are within the scope of the description given above.

[0298] [Manufacturing Example]

[0299] Cellulose pulp containing 93.9% α-cellulose with a degree of polymerization (DPw) of 820 was mixed with NMMO / H2O solvent containing 0.01% by weight of propyl gallate to prepare a spinning solution with a concentration of 11% by weight for preparing filaments. Then, while maintaining the spinning temperature at 110°C at the spinning nozzle, the spinning solution was spun at a appropriately controlled discharge rate and spinning speed.

[0300] The spinning solution in the filament phase, discharged from the spinning nozzle, is supplied through an air gap to the coagulation solution in the coagulation tank (based on 100 wt% total coagulation solution, which has a concentration of 75 wt% water and 25 wt% NMMO, and a temperature of approximately 15°C). At this point, the solution is spun at 8°C and 120 Nm... 3 Cooling air at a flow rate of / h causes the spinning solution to solidify once in the air gap. The solidified spinning solution is then immersed in a coagulation solution for secondary solidification, thus obtaining Lyocell multifilament. The Lyocell multifilament in the coagulation solution is conveyed by traction rollers. Furthermore, the concentration of the coagulation solution is continuously monitored using sensors and refractometers.

[0301] The solidified lyocell multifilament is then washed. Specifically, the filament is introduced into a traction roller, and residual NMMO in the filament is removed by using a washing liquid sprayed from the washing device. The washed filament is then immersed in a tank designed to have a specified emulsion concentration.

[0302] A force of 29.42 N / cm is applied to the filament using a nip roll installed in the trough discharge section. 2 (3.0kgf / cm 2 The pressure of the pressure rollers is adjusted to control the moisture content of the lyocell multifilament. The filament is then fed into a crimping machine for crimping. Specifically, the pressure of the pressure rollers is set to 24.52 N / cm. 2 (2.5 kgf / cm 2 The scraper pressure was set to 4.90 N / cm. 2 (0.5 kgf / cm 2 To manufacture filament bundles.

[0303] To prevent static electricity and to provide flexibility to the manufactured filaments, a secondary emulsion treatment is performed, and immediately after the emulsion treatment, the emulsified filaments are passed through a continuous drying device set at 120°C to obtain a dried filament product.

[0304] The manufactured filaments have a fineness of 2.22 to 3.89 dtex (2.0 to 3.5 denier) and a total fineness of 3,333 to 5,000 dtex (30,000 to 45,000 denier), with a crimp count of 9.84 to 11.81 crimps / cm (25 to 30 crimps / inch).

[0305] Example 1

[0306] The Lyocell filament bundle is manufactured according to the manufacturing example, but the ratio of the rotational speed of the last traction roller during washing to the rotational speed of the traction roller in the coagulation liquid is 1.05.

[0307] Example 2

[0308] Lyocell filament bundles are manufactured according to the manufacturing example, but the pressure of the clamping rollers is 34.32 N / cm. 2 (3.5 kgf / cm 2 The ratio of the rotational speed of the last traction roller in the washing process to the rotational speed of the traction roller in the coagulation liquid is 1.05.

[0309] Example 3

[0310] Lyocell filament bundles are manufactured according to the manufacturing example, but the pressure of the clamping rollers is 34.32 N / cm. 2 (3.5 kgf / cm 2 The ratio of the rotational speed of the last traction roller in the washing process to the rotational speed of the traction roller in the coagulation liquid is 1.10.

[0311] Example 4

[0312] The Lyocell filament bundle is manufactured according to the manufacturing example, but the ratio of the rotational speed of the last traction roller during washing to the rotational speed of the traction roller in the coagulation liquid is 1.10.

[0313] Example 5

[0314] The Lyocell filament bundle is manufactured according to the manufacturing example, but the ratio of the rotational speed of the last traction roller during washing to the rotational speed of the traction roller in the coagulation liquid is 1.15.

[0315] Example 6

[0316] Lyocell filament bundles are manufactured according to the manufacturing example, but the pressure of the clamping rollers is 34.32 N / cm. 2 (3.5 kgf / cm 2 The ratio of the rotational speed of the last traction roller in the washing process to the rotational speed of the traction roller in the coagulation liquid is 1.15.

[0317] Comparative Example 1

[0318] Lyocell filament bundles are manufactured according to the manufacturing example, but the pressure of the clamping rollers is 68.65 N / cm. 2 (7.0 kgf / cm 2 The ratio of the rotational speed of the last traction roller in the washing process to the rotational speed of the traction roller in the coagulation liquid is 1.00.

[0319] Comparative Example 2

[0320] Lyocell filament bundles are manufactured according to the manufacturing example, but the pressure of the clamping rollers is 9.81 N / cm. 2 (1.0 kgf / cm 2 The ratio of the rotational speed of the last traction roller in the washing process to the rotational speed of the traction roller in the coagulation liquid is 1.10.

[0321] Comparative Example 3

[0322] Lyocell filament bundles are manufactured according to the manufacturing example, but the pressure of the clamping rollers is 49.03 N / cm. 2 (5.0 kgf / cm 2 The ratio of the rotational speed of the last traction roller in the washing process to the rotational speed of the traction roller in the coagulation liquid is 1.15.

[0323] Experiment 1

[0324] The moisture content of each lyocell material from Examples 1 to 6 and Comparative Examples 1 to 3 was measured. For each lyocell material, the moisture content was measured before curling and according to Equation 2: Formula 2

[0325] In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0326] The ratio of rotational speed, pressure of clamping rollers, and moisture content of Examples 1 to 6 and Comparative Examples 1 to 3 are shown in Table 1 below.

[0327] [Table 1]

[0328] Referring to Table 1, it was confirmed that the moisture content of the Lyocell materials in Examples 1 to 6 was in the range of 200% to 350%, while the moisture content of the Lyocell materials in Comparative Examples 1 to 3 was less than 200% or greater than 350%.

[0329] <Experiment 2>

[0330] For each Lyocell material in Examples 1 to 6 and Comparative Examples 1 to 3, the elongation, toughness, and shape stability of the curl were measured.

[0331] Elongation and toughness were measured using a low-speed stretching machine from INSTRON, Co. The stretching rate of the monofilament during the measurement was 60 mm / min.

[0332] Shape stability was measured using FAVIMAT+ according to Equation 1. The initial load during the measurement was 0.44 cN / tex (0.05 g / de), and the crimp sensitivity was 0.01 mm. The load applied to the monofilament was 5 cN / tex, and the load application time and recovery time were both 5 seconds.

[0333] Formula 1

[0334] The shape stability of the curl (%) = (L0 - L) b ) / (L0- L) 100

[0335] In Equation 1, L represents the length of the monofilament measured under an initial load of 0.01 cN / tex, L0 represents the length of the monofilament measured under a load of 5 cN / tex, and L b This indicates the length of the monofilament measured under restored (0.01 cN / tex) conditions after the 5 cN / tex load was removed.

[0336] The toughness, elongation, and curl shape stability of Examples 1 to 6 and Comparative Examples 1 to 3 are shown in Table 2 below.

[0337] [Table 2]

[0338] Referring to Table 2, it was confirmed that the curl shape stability of each of the Lyocell materials in Examples 1 to 6 was in the range of 20% to 60%, while the moisture content of each Lyocell material in Comparative Examples 1 to 3 was less than 20% or greater than 60%.

[0339] Experiment 3

[0340] Filters for smoking products were manufactured using the lyocell material of Examples 1 to 6 and Comparative Examples 1 to 3. The filters for smoking products were manufactured in a rod shape.

[0341] For each filter used in smoking products that includes lyocell material, the maximum weight of the lyocell material and the maximum suction resistance are measured. Weight refers to the weight of the lyocell material used in the manufacture of one filter for smoking products. Suction resistance is the pressure difference measured at both ends of the filter when air is passed through it at a rate of 17.5 ml / sec at room temperature (22 ± 2°C).

[0342] In addition, the number of filters for smoking products manufactured per minute using the lyocell materials of Examples 1 to 6 and Comparative Examples 1 to 3 was calculated (production per minute).

[0343] For each filter for smoking products manufactured using the lyocell material of Examples 1 to 6 and Comparative Examples 1 to 3, the maximum weight, maximum suction resistance, and output per minute of each filter for smoking products are shown in Table 3 below.

[0344] [Table 3]

[0345] Referring to Table 3, it was confirmed that, compared to filters for smoking products made of lyocell material including Comparative Examples 1 to 3, filters for smoking products made of lyocell material including Examples 1 to 6 provided increased maximum weight and maximum suction resistance. Furthermore, it was confirmed that, compared to filters for smoking products made of lyocell material including Comparative Examples 1 to 3, filters for smoking products made of lyocell material including Examples 1 to 6 could be manufactured at a higher rate.

Claims

1. A lyocell material comprising crimped lyocell multifilaments, The shape stability of the curled part ranges from 20% to 60%.

2. The lyocell material according to claim 1, The tensile strength of one or more monofilaments contained in the lyocell multifilament is from 0.3 g / de to 0.8 g / de.

3. The lyocell material according to claim 1, The number of curls is between 10 and 50 per inch.

4. The lyocell material according to claim 1, The lyocell multifilament has a single filament fineness of 1.5 denier to 8.0 denier.

5. The lyocell material according to claim 1, The total fineness of the lyocell material is from 15,000 denier to 55,000 denier.

6. The lyocell material according to claim 1, The shape stability of the curl is calculated using Equation 1: Formula 1 The shape stability of the curl (%) = (L0 - L) b ) / (L0- L) 100 in, In Equation 1, L represents the length of the monofilament measured under an initial load (0.01 cN / tex), L0 represents the length of the monofilament measured under a load of 5 cN / tex, and L b This indicates the length of the monofilament measured under restored (0.01 cN / tex) conditions after the 5 cN / tex load was removed.

7. The Lyocell material according to claim 1, The shape stability of the curl is 25% to 55%.

8. The lyocell material according to claim 1, The moisture content of the lyocell multifilaments is 200% to 350%.

9. The lyocell material according to claim 8, The moisture content mentioned above is a value measured according to Equation 2: Formula 2 in, In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

10. The lyocell material according to claim 8, The moisture content mentioned therein is a value measured by the Lyocell multifilament before it is crimped.

11. The lyocell material according to claim 1, The lyocell material mentioned above is a bundle of lyocell fibers.

12. The lyocell material according to claim 1, The lyocell material mentioned above is used in filters for smoking products.

13. A filter for smoking articles comprising the lyocell material as described in any one of claims 1 to 12.

14. The filter for smoking articles according to claim 13, The maximum weight of each filter containing the lyocell material is between 100 mg / filter and 1,000 mg / filter.

15. The filter for smoking articles according to claim 14, The maximum suction resistance of each filter ranges from 100 mmWG / filter to 900 mmWG / filter.

16. A smoking article comprising the filter for a smoking article as described in claim 13.

17. A method for manufacturing a lyocell material, the method comprising: Spinning with Lyocell spinning solution; The spun lyocell spinning solution is solidified to obtain lyocell multifilament; Wash the Lyocell multifilament; The lyocell multifilaments are treated with an emulsion; and the lyocell multifilaments are crimped. The moisture content of the Lyocell multifilament is controlled during, after, or both during and after the washing process.

18. The method for manufacturing lyocell material according to claim 17, The moisture content of the lyocell multifilament is controlled to be between 200% and 350% before the curling is applied.

19. The method for manufacturing lyocell material according to claim 17, The moisture content of the lyocell multifilament is controlled by applying pressure.

20. The method for manufacturing lyocell material according to claim 17, The shape stability of the lyocell material after the curling is measured is 20% to 60%.

Images