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

Abstract

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

Description

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

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

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

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

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

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

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

[0007] According to one aspect of the present application, a lyocell material, a filter including the same, and a smoking article may be provided.

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

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

[0010] According to one aspect of the present application, a lyocell material comprising crimped lyocell multifilaments and having a dimensional stability of the crimp of 20% to 60% can be provided.

[0011] In some embodiments, the crimped lyocell multifilament comprises one or more monofilaments. The crimped lyocell multifilament may be considered a lyocell multifilament in the present application.

[0012] In addition, according to another aspect of the present application, a filter for a lyocell smoking article may be provided comprising a lyocell material having a dimensional stability of a crimp of 20% to 60%.

[0013] According to another aspect of the present application, a smoking article comprising the lyocell material or filter may be provided.

[0014] According to another aspect of the present application, a method for manufacturing the lyocell material, a filter comprising the same, and a smoking article may be provided.

[0015]

[0016] In this specification, "smoking article" may refer to an article capable of generating an aerosol, such as a cigarette or cigar. In this regard, the smoking article may include an aerosol-generating material or an aerosol-forming substrate. Furthermore, the smoking article may include a solid material based on tobacco raw materials, such as tobacco leaf, tobacco ash, or reconstituted tobacco. Additionally, the smoking material may include volatile compounds.

[0017] Unless otherwise specifically defined herein, if the properties of lyocell materials, filters for smoking articles, and their related components or compositions are affected by temperature, the temperature at which the properties are determined or measured may be room temperature. In this case, room temperature refers to a temperature in a non-thermally or non-heated state, and may be, for example, a temperature of 10 to 35°C, particularly 15 to 35°C, 20 to 30°C, or about 25°C.

[0018] As used herein, the term “crimp” may refer to a wave-like, curled or undulated configuration imparted to a material, such as a fiber, (mono)filament, multifilament and / or yarn, either inherently or through mechanical, thermal and / or chemical processes. Crimp may be characterized by a periodic deviation from a straight axis along the length of the material, fiber, filament, multifilament and / or yarn. One crimp in a material, fiber, filament, multifilament and / or yarn may be defined as one repeating unit of said periodic deviation. The presence of crimp influences properties of the material and fabrics made from the material, such as elasticity, bulk, resilience and texture.

[0019] As used herein, the term “degree of polymerization” (DPw) may refer to the number of monomer units and / or repeating units in a macromolecule, polymer, or oligomer molecule. The degree of polymerization may be expressed as Mn / M0, where Mn is the number-average molecular weight of the macromolecule, polymer, or oligomer molecule, and M0 is the molecular weight of the monomer or repeating unit.

[0020] In this specification, “lyocell multifilament” may mean a multifilament made of cellulose. In particular, the lyocell multifilament may be a (multi)filament and / or fiber made of cellulose derived or primarily derived from wood pulp, in particular a semi-synthetic (multi)filament and / or fiber.

[0021] As used herein, “lyocell tow” comprises or consists of at least one lyocell multifilament.

[0022] 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 the fiber's ability to withstand tension or tensile force without breaking. Tenacity is expressed in units of force per unit linear density, such as cN / tex. A higher tenacity value indicates a stronger fiber. Tenacity is measured by dividing the breaking load of a filament or fiber by its mass per unit length.

[0023] As used herein, "average strength" refers to the average tensile strength of a filament or fiber per linear density or per unit mass. This is a measure of the fiber's ability to withstand tension or tensile force without breaking. The average strength is expressed in units of force per unit linear density, such as cN / tex. The average strength is measured by dividing the breaking load of the filament or fiber by its mass per unit length, where the strengths of at least two filaments are measured and the average value of the strengths of these filaments is considered the average strength. For example, the average strength is the average of the values ​​measured for 20 monofilaments, the average of the values ​​measured for 50 monofilaments, or the average of the values ​​measured for 100 monofilaments.

[0024] As used herein, "dimensional stability" refers to the ability of a material (e.g., lyocell) to maintain its original shape and / or dimensions under various environmental and stress conditions (e.g., chemical or physical actions). One factor that can affect dimensional stability is moisture absorption into the fibers, filaments, or threads that make up the material. The better and higher the dimensional stability of a material, the less shrinkage it experiences during processing and handling, and the more it can maintain its original size and shape even after repeated washing and stretching.

[0025] As used herein, the "elongation" of a fiber or filament refers to the length that the fiber or filament increases until it breaks, expressed as a percentage (%) of the original length of the fiber. The elongation (%) is calculated by dividing the difference between the final length of the fiber or filament after it is broken and its original length by the original length and multiplying this ratio by 100. The "average elongation" herein relates to the average value of the elongations of at least two fibers or filaments. For example, the average elongation is the average of the values ​​measured for 20 monofilaments, the average of the values ​​measured for 50 monofilaments, or the average of the values ​​measured for 100 monofilaments.

[0026] As used herein, "uncoiled lyocell material" refers to lyocell material and / or lyocell fibers and / or lyocell multifilaments that have been separated, uncoiled, unspooled, loosened or unwrapped from their original compressed and / or rolled state.

[0027] As used herein, "non-circular cross-section" may refer to a cross-section shape that deviates from the standard circular shape. For example, the cross-section shape may have a Y-shaped cross-section, a rectangular cross-section, a star-shaped cross-section, a leaf-shaped cross-section, a hexagonal cross-section, a polygonal cross-section, etc. The non-circular cross-section may include three or more protrusions, and preferably three protrusions. Here, "protrusions" may mean distinct, extended segments or arms extending outward from the central core or junction point of the monofilament cross-section. A non-circular cross-section including three protrusions may be referred to as a "Y-shaped cross-section." Lyocell tow may have a Y-shaped cross-section in terms of its application to cigarette filters.

[0028] In some embodiments, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0029] In some embodiments, the lyocell multifilament comprises one or more monofilaments, all of which may have a heterogeneous cross-section.

[0030] Hereinafter, the present invention will be described in more detail.

[0031]

[0032] The present application relates to a lyocell material. The lyocell material can be used in smoking articles, and, without particular limitation, the lyocell material can be used in a filter for smoking articles.

[0033]

[0034] According to one aspect, a lyocell material is provided comprising crimped lyocell multifilaments, wherein the crimp has a dimensional stability of 20% to 60%. In some embodiments, the tenacity 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).

[0035] In some embodiments, the average strength 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).

[0036] In some embodiments, the elongation of one or more monofilaments included in the lyocell multifilament may be from 5% to 10%.

[0037] In some embodiments, the average elongation of the monofilaments included in the lyocell multifilament may be 5% to 10%.

[0038] In some embodiments, the number of crimps can be from 3.94 ea / cm to 19.69 ea / cm (10 ea / inch to 50 ea / inch).

[0039] In some embodiments, the number of crimps can be from 9.84 ea / inch to 11.81 ea / cm (25 ea / inch to 30 ea / inch).

[0040] In some embodiments, the single fiber count of the lyocell multifilament may be from 1.67 to 8.89 dtex (1.5 to 8.0 denier).

[0041] Exemplary lyocell materials may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0042] In some embodiments, the shape stability of the crimp can be calculated by Equation 1 below.

[0043] [Formula 1]

[0044] Shape stability of crimp (%) = (L0-L b ) / (L0-L)·100

[0045] In Equation 1, L represents the length of the monofilament measured under the condition of initial load (0.01 cN / tex), L0 represents the length of the monofilament measured under the condition of load of 5 cN / tex, and L b represents the length of the monofilament measured when the load of 5 cN / tex is removed and then restored (0.01 cN / tex).

[0046] In some embodiments, the shape stability of the crimp may be between 25% and 55%.

[0047] In some embodiments, the moisture content of the lyocell multifilament may be between 200% and 350%.

[0048] In some embodiments, the moisture content may be a value measured according to Equation 2 below.

[0049] [Formula 2]

[0050]

[0051] In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0052] In some embodiments, the moisture content may be a value measured from the lyocell filaments prior to crimping. The crimp is applied in the crimping step of the method for manufacturing a lyocell material described below.

[0053] In some embodiments, the moisture content may be measured from washed lyocell multifilament. Washed lyocell multifilament may refer to lyocell multifilament that has undergone a washing step in the method for manufacturing lyocell material described below.

[0054] In some embodiments, the moisture content may be measured from emulsified lyocell multifilament. Emulsified lyocell multifilament may refer to lyocell multifilament that has undergone the emulsification step of the method for manufacturing lyocell material described below.

[0055] In some embodiments, the lyocell material may be lyocell tow.

[0056] In some embodiments, the lyocell material may be used for a smoking article filter.

[0057] In some embodiments, a filter for a smoking article is provided comprising any one of the lyocell materials.

[0058] In some embodiments, for a filter for a smoking article, the maximum weight per filter of the lyocell material may be from 100 mg / filter to 1,000 mg / filter. In particular, the maximum weight per filter of the lyocell material may be from 200 mg / filter to 1,000 mg / filter, from 300 mg / filter to 1,000 mg / filter, from 400 mg / filter to 1,000 mg / filter, from 500 mg / filter to 1,000 mg / filter, from 600 mg / filter to 1,000 mg / filter, from 700 mg / filter to 1,000 mg / filter, or from 800 mg / filter to 1,000 mg / filter.

[0059] In some embodiments, the maximum suction resistance per filter for a smoking article may be from 100 mmWG / filter to 900 mmWG / filter. In particular, the maximum suction resistance per filter of the lyocell material may be from 100 mmWG / filter to 900 mmWG / filter, from 150 mmWG / filter to 900 mmWG / filter, from 200 mmWG / filter to 900 mmWG / filter, from 250 mmWG / filter to 900 mmWG / filter, from 300 mmWG / filter to 900 mmWG / filter, from 350 mmWG / filter to 900 mmWG / filter, or from 400 mmWG / filter to 900 mmWG / filter.

[0060]

[0061] The minimum weight of the lyocell material included in the filter for smoking articles can be determined in the following manner. For example, the minimum weight of the lyocell material can be the weight when all of the following conditions 1, 2, and A are satisfied.

[0062] [Condition 1] The manufacturing process of filters for smoking articles can be continuously performed.

[0063] [Condition 2] The circumference of the filter for smoking articles must be maintained at 24.2 mm.

[0064] [Condition A] One end of the filter paper of the filter for smoking articles is empty to a depth of 0.5 mm.

[0065] The maximum weight of the lyocell material included in the filter for smoking articles can be determined in the following manner. For example, the maximum weight of the lyocell material can be the weight when all of the following conditions 1, 2, and B are satisfied.

[0066] [Condition 1] The manufacturing process of filters for smoking articles can be continuously performed.

[0067] [Condition 2] The circumference of the filter for smoking articles must be maintained at 24.2 mm.

[0068] [Condition B] The filter for smoking articles does not burst.

[0069]

[0070] In some embodiments, a smoking article is provided comprising any one of the filters for smoking articles.

[0071] In some embodiments, a method for producing a lyocell material is provided, comprising: a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step. In some embodiments, the steps are performed in the order mentioned.

[0072] Additionally, in some embodiments, in the method for manufacturing lyocell material, the moisture content of the lyocell multifilament is adjusted to 200% to 350% prior to the crimping step.

[0073] In some embodiments, in the method for manufacturing a lyocell material, the moisture content of the lyocell multifilament can be controlled during the washing step, after the washing step, or during and after the washing step.

[0074] In some embodiments, in the method for manufacturing a lyocell material, the moisture content of the lyocell multifilament can be controlled in the washing step.

[0075] In some embodiments, in the method for manufacturing a lyocell material, the step of obtaining the lyocell multifilament further includes a step of pulling the lyocell multifilament by a first roller, the step of washing the lyocell multifilament further includes a step of pulling the lyocell multifilament by a second roller, and the moisture content of the lyocell multifilament can be controlled by a ratio of the rotation speeds of the second roller to the first roller. In some embodiments, the rotation speed of the first roller can be different from the rotation speed of the second roller. In some embodiments, the rotation speed of the second roller can be greater than the rotation speed of the first roller.

[0076] In some embodiments, in the method for manufacturing a lyocell material, the pulling of the lyocell multifilaments in the washing step may be performed by one or more rollers, and when the pulling of the lyocell multifilaments in the washing step is performed by two or more rollers, the second roller may be the last roller.

[0077] In some embodiments, in the method for manufacturing a lyocell material, the ratio of the rotational speed of the second roller to the first roller may be 1.00 to 1.15.

[0078] In some embodiments, in the method for manufacturing a lyocell material, the moisture content of the lyocell multifilament can be adjusted after the washing step.

[0079] In some embodiments, in the method for manufacturing lyocell material, the moisture content of the lyocell multifilament can be adjusted after the emulsion treatment step.

[0080] In some embodiments, in the method for manufacturing a lyocell material, the moisture content of the lyocell multifilament can be controlled by the pressurization conditions.

[0081] In some embodiments, the method for manufacturing a lyocell material further includes a step of pressing the lyocell multifilament, and the step of pressing the lyocell multifilament may be included between the washing step and the crimping step.

[0082] In some embodiments, the method for manufacturing a lyocell material further comprises a step of pressing the lyocell multifilament, and the step of pressing the lyocell multifilament may be included between the step of emulsifying and the step of applying crimp.

[0083] In some embodiments, in the method for manufacturing a lyocell material, the dimensional stability of the crimp of the lyocell material measured after the crimping step may be from 20% to 60%.

[0084]

[0085] In some embodiments, the lyocell material has a dimensional stability of 20% to 60% of the crimp. This enhances the processability of the lyocell material. In particular, when manufacturing a filter for a smoking article comprising the lyocell material, the performance and manufacturing efficiency of the filter can be improved by using a lyocell material that satisfies the dimensional stability of the specified crimp.

[0086] In particular, the filter for a smoking article comprising the lyocell material described above can have an increased maximum content of lyocell material per filter, and the maximum suction resistance of the filter for a smoking article can be increased. As a result, the filtering performance of the filter for a smoking article comprising the lyocell material can be improved, and the amount of lyocell material required to achieve a given filtering performance can be reduced.

[0087] Additionally, lyocell materials with a predetermined degree of crimp dimensional stability can provide improved post-processing properties. As a result, the efficiency of the process for manufacturing a smoking article filter using the lyocell material can be increased. Specifically, the time required to manufacture a smoking article filter can be reduced. More specifically, the number of smoking article filters manufactured per unit time can be significantly increased.

[0088] Meanwhile, in some embodiments, in the production of lyocell material, the moisture content of the lyocell multifilament may be controlled prior to the step of imparting crimp to the lyocell multifilament. As a result, crimp can be imparted to the lyocell multifilament with the controlled moisture content, and changes in elongation and strength of the lyocell material according to the imparting of crimp can be controlled. As a result, the dimensional stability of the crimp of the crimped lyocell material can satisfy a predetermined range.

[0089]

[0090] [Irregular cross-section]

[0091] One or more of the lyocell monofilaments included in the lyocell material of the present application may have an irregular cross-section. "Irregular" means that the shape of the outer line of the cross-section is not circular, and the "cross-section" may be a cross-section obtained by cutting the lyocell monofilament virtually or actually perpendicular to the longitudinal direction of the filament.

[0092] The outline of the heteromorphic cross-section may be tangent to an imaginary first circle and an imaginary second circle, respectively. Furthermore, the imaginary second circle may be depicted within the imaginary first circle, and / or the imaginary second circle may be within the imaginary first circle. The "imaginary first circle" may also be referred to as an "imaginary circumcircle" and / or a "circumcircle," and / or the "imaginary second circle" may also be referred to as an "imaginary incircle" and / or an "incircle."

[0093] The virtual first circle may be the circle with the smallest area value among circles drawn to encompass one cross-section of the monofilament. The virtual second circle may be the circle with the largest area value among circles drawn within the cross-section of the monofilament.

[0094] If a circumscribed circle including the cross-section of the monofilament can be drawn, the virtual first circle can be said circumscribed circle. If an inscribed circle can be drawn inside the cross-section of the monofilament, the virtual second circle can be said inscribed circle.

[0095] The heterogeneous cross-section may have a shape including multiple protrusions, for example, a Y-shaped cross-section including three protrusions. It may be understood that the multiple protrusions are formed integrally with the imaginary second circle as the center, and that their ends are in contact with the imaginary first circle. The terms mentioned herein have the same meanings as those described above.

[0096] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0097] <Mathematical Formula 1>

[0098] Lee Hyung-do = r1 / r2

[0099] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0100] For example, the radius of the virtual first circle may be 4 to 40 μm, the radius of the virtual second circle may be 2 to 14 μm, and the degree of heterogeneity may be 1.01 to 10.

[0101] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0102] <Mathematical Formula 2>

[0103] Space occupancy = (S1 / S2) Х 100(%)

[0104] Here, S1 is the area of ​​the imaginary first circle, and S2 is the cross-sectional area of ​​the monofilament contained in the lyocell fiber.

[0105] For example, the space occupancy of a monofilament having a heterogeneous cross-section can be 120 to 600%.

[0106]

[0107] [Island]

[0108] Lyocell multifilament can have a fineness suitable for manufacturing filters for smoking articles and ensuring their function.

[0109] In one example, the single filament fineness of the filaments forming the lyocell multifilament may be 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness refers to the fineness of one monofilament separated from the multifilament.

[0110] In particular, the upper limit of the single fiber fineness of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., hardness or implementation of suction resistance) and fairness of the filter for smoking articles.

[0111] In one example, the total fineness of the lyocell multifilament may be 1,667 to 6,111 tex (15,000 to 55,000 denier). For example, the lower limit of the total fineness is, for example, 1,778 tex (16,000 denier) or more, 1,833 tex (16,500 denier) or more, 1,889 tex (17,000 denier) or more, 1,944 tex (17,500 denier) or more, 2,000 tex (18,000 denier) or more, 2,056 tex (18,500 denier) or more, 2,111 tex (19,000 denier) or more, 2,167 tex (19,500 denier) or more, 2,222 tex (20,000 denier) or more, 2,278 tex (20,500 denier) or more, 2,333 tex (21,000 denier) or more, 2,389 21,500 denier (tex) or more, 2,444 tex (22,000 denier) or more, 2,500 tex (22,500 denier) or more, 2,556 tex (23,000 denier) or more, 2,611 tex (23,500 denier) or more, 2,667 tex (24,000 denier) or more, 2,722 tex (24,500 denier) or more, 2,778 tex (25,000 denier) or more, 2,833 tex (25,500 denier) or more, 2,889 tex (26,000 denier) or more, 2,944 tex (26,500 denier) or more, 3,000 tex (27,000 denier) or more, 3,056 tex (27,500 denier) or more, 3,111 tex (28,000 denier) or more, 3,167 tex (28,500 denier) or more, 3,222 tex (29,000 denier) or more, 3,287 tex (29,500 denier) or more, 3,333 tex (30,000 denier) or more, 3,389 tex (30,500 denier) or more, 3,444 tex (31,000 denier) or more, 3,500 tex (31,500 denier) or more, 3,556 tex (32,000 denier) or more, 3,611 tex (32,500 denier) or more, 3,667 tex (33,000 denier) or more, 3,722 tex (33,500 denier) or more, 3,778 tex (34,000 denier) or more, 3,833 tex (34,500 denier) or more, 3,889 tex (35,000 denier) or more, 3,944 tex (35,500 denier) or more, 4,000 tex (36,000 denier) or more, 4,056 tex (36,500 denier) or more, 4,111 tex (37,000 denier) or more, 4,167 tex (37,500 denier) or more, 4,222 tex (38,000 denier) or more, 4,278 tex (38,500 denier) or more, 4,333 tex (39,000 denier) or more, 4,389 tex (39,500 denier) or more, 4,444 tex (40,000 denier) or more, 4,500 tex (40,500 denier) or more, 4,556 tex (41,000 denier) or more, 4,611 tex (41,500 denier) or more, 4,667 tex (42,000 denier) or more, 4,722 tex (42,500 denier) or more, 4,778 tex (43,000 denier) or more, 4,833 tex (43,500 denier) or more, 4,889 tex (44,000 denier) or more, 4,944 tex (44,500 denier) or more, 5,000 tex (45,000 denier) or more, 5,056 tex (45,500 denier) or more, 5,111 tex (46,000 denier) or more, 5,167 tex (46,500 denier) or more, 5,222 tex (47,000 denier) or more, 5,278 tex (47,500 denier) or more, 5,333 tex (48,000 denier) or more, 5,389 tex (48,500 denier) or more, 5,444 tex (49,000 denier) or more, 5,500 tex (49,500 denier) or more, 5,556 tex (50,000 denier) or more, 5,611 tex (50,500 denier) or more, 5,667 tex (51,000 denier) or more, 5,722 tex (51,500 denier) or more, 5,778 tex (52,000 denier) or more, 5,833 tex (52,500 denier) or more, 5,889 tex (53,000 denier) or more, 5,944 tex (53,500 denier) or more, 6,000 tex (54,000 denier) or more, or 6,056 tex (54,500 denier) or more. And, the upper limit is, for example, 6,056 tex (54,500 denier) or less, 6,000 tex (54,000 denier) or less, 5,944 tex (53,500 denier) or less, 5,889 tex (53,000 denier) or less, 5,833 tex (52,500 denier) or less, 5,778 tex (52,000 denier) or less, 5,722 tex (51,500 denier) or less, 5,667 tex (51,000 denier) or less, 5,611 tex (50,500 denier) or less, 5,556 tex (50,000 denier) or less, 5,500 tex (49,500 denier) or less, 5,444 tex (49,000 denier) or less, 5,389 tex (48,500 denier) or less, 5,333 tex (48,000 denier) or less, 5,278 tex (47,500 denier) or less, 5,222 tex (47,000 denier) or less, 5,167 tex (46,500 denier) or less, 5,111 tex (46,000 denier) or less, 5,056 tex (45,500 denier) or less, 5,000 tex (45,000 denier) or less, 4,944 tex (44,500 denier) or less, 4,889 tex (44,000 denier) or less, 4,833 tex (43,500 denier) or less, 4,778 tex (43,000 denier) or less, 4,722 tex (42,500 denier) or less, 4,667 tex (42,000 denier) or less, 4,611 tex (41,500 denier) or less, 4,556 tex (41,000 denier) or less, 4,500 tex (40,500 denier) or less, 4,444 tex (40,000 denier) or less, 4,389 tex (39,500 denier) or less, 4,333 tex (39,000 denier) or less,4,278 tex (38,500 denier) or less, 4,222 tex (38,000 denier) or less, 4,167 tex (37,500 denier) or less, 4,111 tex (37,000 denier) or less, 4,056 tex (36,500 denier) or less, 4,000 tex (36,000 denier) or less, 3,944 tex (35,500 denier) or less, 3,889 tex (35,000 denier) or less, 3,833 tex (34,500 denier) or less, 3,778 tex (34,000 denier) or less, 3,722 tex (33,500 denier) or less, 3,667 tex (33,000 denier) or less, 3,611 tex (32,500 denier) or less, 3,556 tex (32,000 denier) or less, 3,500 tex (31,500 denier) or less, 3,444 tex (31,000 denier) or less, 3,389 tex (30,500 denier) or less, 3,333 tex (30,000 denier) or less, 3,278 tex (29,500 denier) or less, 3,222 tex (29,000 denier) or less, 3,167 tex (28,500 denier) or less, 3,111 tex (28,000 denier) or less, 3,056 tex (27,500 denier) or less, 3,000 tex (27,000 denier) or less, 2,944 tex (26,500 denier) or less, 2,889 tex (26,000 denier) or less, 2,833 tex (25,500 denier) or less, 2,778 tex (25,000 denier) or less, 2,722 tex (24,500 denier) or less, 2,667 tex (24,000 denier) or less, 2,611 tex (23,500 denier) or less, 2,556 tex (23,000 denier) or less, 2,500 tex (22,500 denier) or less, 2,444 tex (22,000 denier) or less, 2,389 tex (21,500 denier) or less, 2,333 tex (21,000 denier) or less, 2,278 tex (20,500 denier) or less, 2,222 tex (20,000 denier) or less, 2,It may be 167 tex (19,500 denier) or less, 2,111 tex (19,000 denier) or less, 2,056 tex (18,500 denier) or less, 2,000 tex (18,000 denier) or less, 1,944 tex (17,500 denier) or less, 1,889 tex (17,000 denier) or less, 1,833 tex (16,500 denier) or less, 1,778 tex (16,000 denier) or less, or 1,722 tex (15,500 denier) or less. If the total fineness is outside the above range, the process for manufacturing a filter for smoking articles may not be good (continuous process is not possible due to cutting), and if the amount of tow filled in the filter paper during manufacturing of a filter for smoking articles is too small or too large, it may be difficult to secure sufficient filter properties (e.g., hardness or suction resistance, etc.).

[0112] The method for measuring fineness is not particularly limited, but for example, take a 2 m sample of the lyocell material to be measured, for example, lyocell tow, and leave it in a room that is kept in a constant temperature and humidity of 20℃ and 65% humidity for 24 hours to stabilize. One end of the stabilized lyocell tow is fixed, and a weight with a load of 2 kg is attached to the other end. After maintaining the tow in a state of being extended by the load (stabilization) for 5 seconds, it is cut into 90 cm to obtain a sample, and the weight of the sample is measured (total fineness). The fineness is converted into a denier scale according to the denier conversion method, and the measured weight X 10000. If the total fineness is divided by the number of strands of monofilament in the sample, the single fineness of the monofilament in the sample is calculated.

[0113] The total fineness of the lyocell multifilament as described above can be determined by the single fineness and crimp count of the filament. In the present application, the single fineness and crimp count can be controlled, and the total fineness of the lyocell material suitable for manufacturing a filter for a smoking article and ensuring its function can be secured.

[0114]

[0115] [Number of crimps]

[0116] In one example, lyocell multifilament can have crimps of 3.94 to 19.69 per centimeter (10 to 50 per inch).

[0117] For example, the number of crimps may be 5.91 ea / cm (15 ea / inch) or more, 7.87 ea / cm (20 ea / inch) or more, 9.84 ea / cm (25 ea / inch) or more, 11.81 ea / cm (30 ea / inch) or more, 13.78 ea / cm (35 ea / inch) or more, 15.75 ea / cm (40 ea / inch) or more, or 17.72 ea / cm (45 ea / inch) or more, and the upper limit may be, for example, 17.72 ea / cm (45 ea / inch) or less, 15.75 ea / cm (40 ea / inch) or less, 13.78 ea / cm (35 ea / inch) or less, 11.81 ea / cm (30 ea / inch) or less, or 9.84 It may be less than ea / cm (25 ea / inch). The number of crimps and their uniformity can be controlled through pressure and temperature conditions, etc., related to the crimping step described below.

[0118] Although not particularly limited, the number of crimps can be measured, for example, using a monofilament property evaluation device (e.g., Favimat). In particular, a manufactured lyocell material (preferably, lyocell tow) sample can be left and stabilized for 24 hours under conditions of a temperature of 20±2℃ and a humidity of 65±4%. A sample can be collected from the stabilized sample so that the crimp is not damaged. The collected sample can be mounted on a dedicated jig with a length (gauge length) of 10 to 30 mm. The initial load during measurement can be 0.44 cN / tex (0.05 g / de), and the crimp sensitivity can be 0.01 mm. The number of crimps can be measured under the conditions described above (i.e., a temperature of 20±2℃ and a humidity of 65±4%).

[0119] Although not specifically limited, lyocell materials manufactured to meet the single fiber count, total fiber count, and / or crimp count described above may be used in smoking articles.

[0120]

[0121] [Properties of Lyocell Material]

[0122] The shape stability of the crimp of the lyocell material may be 20% to 60%. In particular, the lower limit of the shape stability of the crimp of the lyocell material may be 20%, 25%, 30%, 35%, 40%, 45%, 50%, or 55%, and the upper limit of the shape stability of the crimp of the lyocell material may be 60%, 55%, 50%, 45%, 40%, 35%, or 25%.

[0123] In some embodiments, the dimensional stability of the crimp of the lyocell material is from 20% to 60%, from 20% to 55%, from 20% to 50%, from 20% to 45%, from 20% to 40%, from 20% to 35%, from 20% to 30%, from 20% to 25%, from 25% to 60%, from 25% to 55%, from 25% to 50%, from 25% to 45%, from 25% to 40%, from 25% to 35%, from 25% to 30%, from 30% to 60%, from 30% to 55%, from 30% to 50%, from 30% to 45%, from 30% to 40%, from 30% to 35%, from 35% to 60%, from 35% to It can be 55%, 35% to 50%, 35% to 45%, 35% to 40%, 40% to 60%, 40% to 55%, 40% to 50%, 40% to 45%, 45% to 60%, 45% to 55%, 45% to 50%, 50% to 60%, 50% to 55%, or 55% to 60%. In addition, when the shape stability of the crimp of the lyocell material satisfies 20% to 50%, 25% to 50%, 30% to 50%, 35% to 50%, 40% to 50%, or 45% to 50%, the uniformity of the crimp can be further improved.

[0124] In addition, the shape stability of the crimp of the lyocell material can be calculated by the following equation 1.

[0125] [Formula 1]

[0126] Shape stability of crimp (%) = (L0-L b ) / (L0-L)·100

[0127] In Equation 1, L represents the length of the monofilament measured under the condition of initial load (0.01 cN / tex), L0 represents the length of the monofilament measured under the condition of load of 5 cN / tex, and L b represents the length of the monofilament measured when the load of 5 cN / tex is removed and then restored (0.01 cN / tex).

[0128] Additionally, the dimensional stability of the crimp of the lyocell material may be an average of values ​​measured for a plurality of monofilaments. For example, the dimensional stability of the crimp may be an average of values ​​measured for 20 monofilaments, an average of values ​​measured for 50 monofilaments, or an average of values ​​measured for 100 monofilaments.

[0129] Additionally, the measurement of the dimensional stability of the crimp can be performed according to ASTM D 3822 (ASTM D3822 / D3822M-14 (2020)). For example, the time that the load is applied to the monofilament can be 5 seconds, and the time that the monofilament recovers can be 5 seconds.

[0130] Lyocell material has a 20% to 60% crimp dimensional stability, thereby improving the processability of the lyocell material. In particular, in the manufacture of a filter for a smoking article comprising the lyocell material, the performance and manufacturing efficiency of the filter can be improved by using a lyocell material that satisfies a predetermined crimp dimensional stability.

[0131] In a lyocell material having a predetermined crimp dimensional stability, the tenacity of one or more 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).

[0132] In some embodiments, the average strength 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).

[0133] In some embodiments, the elongation of one or more monofilaments included in the lyocell multifilament may be from 5% to 10%.

[0134] In some embodiments, the average elongation of the monofilaments included in the lyocell multifilament may be 5% to 10%.

[0135] Additionally, the elongation and strength of the monofilament can be measured using a tensile tester. The object for which the elongation and strength are measured using the tensile tester may be a monofilament obtained from lyocell material.

[0136] For example, the elongation and strength of monofilaments obtained from lyocell material can be measured using a low-speed extension type tensile tester from INSTRON. The conditions for measuring the elongation and strength can be maintained constant. For example, the elongation and strength of the monofilament can be measured separately or simultaneously by stretching the monofilament at a specific speed. The specific speed can be 60 mm / min. In addition, the measurement temperature, measurement pressure, and / or measurement humidity of the elongation and strength can be maintained uniformly.

[0137] Additionally, stabilization of the monofilament may be performed prior to measuring the dimensional stability, elongation, and strength of the crimp. Stabilization may be performed by allowing the monofilament to stand under constant temperature (20±2°C) and constant humidity (65±4%RH) conditions in accordance with KS K ISO 139.

[0138] By having a lyocell material that satisfies the dimensional stability of a predetermined crimp, and thus satisfies the predetermined strength and predetermined elongation, or the predetermined average strength and predetermined average elongation, the post-processing properties of the lyocell material can be further improved. As a result, the efficiency of the process for manufacturing a filter for a smoking article using the lyocell material can be increased. In particular, the time required for manufacturing a filter for a smoking article can be reduced. In particular, the number of filters for smoking articles manufactured per unit time can be significantly increased.

[0139]

[0140] [Moisture content of lyocell multifilament]

[0141] For example, the moisture content of the lyocell multifilament may be between 200% and 350%. When the moisture content of the lyocell multifilament is less than 200%, the dimensional stability of the crimp of the lyocell multifilament may exceed the range of 20% to 60%.

[0142] In some embodiments, the moisture content of the lyocell multifilament is from 200% to 350%, from 200% to 330%, from 200% to 310%, from 200% to 290%, from 200% to 270%, from 200% to 250%, from 200% to 230%, from 200% to 210%, from 220% to 350%, from 220% to 330%, from 220% to 310%, from 220% to 290%, from 220% to 270%, from 220% to 250%, from 220% to 230%, from 240% to 350%, from 240% to 330%, from 240% to 310%, from 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%.

[0143] When manufacturing a filter for a smoking article, a certain tension is applied to the crimped lyocell multifilament so that the crimped lyocell multifilament can be opened in the longitudinal and transverse directions. However, excessive crimping leads to an increase in the tension, which can result in a decrease in openability. This decrease in openability can result in a decrease in the maximum content of lyocell material per filter used as a filter paper, a decrease in the maximum suction resistance of the filter for a smoking article, and a decrease in the manufacturing process of the filter for a smoking article.

[0144] Conversely, when the moisture content of the lyocell multifilament exceeds 350%, the dimensional stability of the crimp of the lyocell multifilament may fall below the range of 20% to 60%.

[0145] As a result, when a filter for a lyocell smoking article is manufactured, the crimp applied may not maintain its shape during the process of applying a certain tension to the lyocell multifilament so that the crimped lyocell multifilament opens in the lengthwise and widthwise directions.

[0146] Additionally, excessive moisture may prevent sufficient crimping of the lyocell multifilament. Failure to maintain the crimp shape or an insufficient number of crimps may result in a reduction in the maximum lyocell content per filter, a reduction in the maximum suction resistance of the filter for smoking articles, and a deterioration in the manufacturing process of the filter for smoking articles.

[0147] The moisture content of the lyocell multifilament may be a value measured according to the following equation 2.

[0148] [Formula 2]

[0149]

[0150] In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0151] The moisture content may be a value measured from the lyocell filament before crimping (before the crimping step). Alternatively, the moisture content may be a value measured from the lyocell filament immediately before crimping. For example, if a washing step is performed immediately before the crimping step, the moisture content may be a value measured from the lyocell multifilament after the washing step is completed.

[0152] Additionally, the moisture content may be a value measured from the emulsion-treated lyocell multifilament. For example, if the method for manufacturing lyocell multifilament includes a step of emulsion treatment, the moisture content may be a value measured from the emulsion-treated lyocell multifilament. Additionally, if the method for manufacturing lyocell multifilament includes two or more emulsion treatment steps, the moisture content may be a value measured from the last emulsion treatment step performed before the crimping step.

[0153] Therefore, the moisture content of the lyocell multifilament can be controlled during the washing step, after the washing step, or during and after the washing step. The moisture content can also be controlled during the emulsion treatment step, after the emulsion treatment step, or during and after the emulsion treatment step.

[0154] In some embodiments, the method for manufacturing a lyocell material further includes a step of pressing the lyocell multifilament, and the step of pressing the lyocell multifilament may be included between the washing step and the crimping step. Although not particularly limited, the pressing of the lyocell multifilament may be in the range of 29.42 N / cm² to 34.33 N / cm² (3.0 kgf / cm 2 3.5 kgf / cm 2 ) can be performed.

[0155] By performing the step of pressurizing the lyocell multifilament, the moisture content of the lyocell multifilament can be controlled as described above.

[0156]

[0157] [bookbinder]

[0158] In one non-limiting example, the lyocell material may further comprise a binder. The binder may be present, for example, on the surface of the lyocell multifilaments or between the lyocell multifilaments (or monofilaments). The binder may increase the hardness of the filter for a smoking article, thereby preventing problems such as filter jamming during the filter manufacturing process or the manufacturing process of a smoking article (e.g., cigarette).

[0159] The type of binder available is not particularly limited, and any known binder may be used as long as it does not impede the purpose of the present invention. For example, a binder that provides sufficient compatibility with the emulsion used in the present application, improves the hardness of the filter, and provides excellent bonding strength may be used.

[0160] In one non-limiting example, the binder may include a polyester-based binder, a cellulosic-based binder, and / or a vinyl-based binder.

[0161] Although not particularly limited, a polyester binder including at least one selected from the group consisting of alkylene, arylene, and heteroarylene having 5 to 12 carbon atoms may be used as the polyester binder.

[0162] Examples of cellulose-based binders that can be used include, but are not limited to, hydroxypropylmethylcellulose (HPMC), ethylcellulose (EC), and / or methylcellulose (MC), carboxymethylcellulose (CMC), etc.

[0163] In some embodiments, the cellulose-based binder is selected from the group consisting of hydroxypropylmethylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and combinations thereof.

[0164] Examples of vinyl binders that can be used include, but are not limited to, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and / or ethylene vinyl acetate (EVAc).

[0165] In some embodiments, the vinyl binder is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and combinations thereof.

[0166] The method of applying (coating) the above binder to the lyocell material is described below.

[0167]

[0168] [emulsion]

[0169] The above lyocell material may include lyocell multifilaments; and an emulsion coated on the lyocell multifilaments. The emulsion may include (a) an ester of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol; and (b) an ester of sorbitan and a fatty acid having 16 or more carbon atoms. The emulsion may be applied to part or all of the monofilaments or multifilaments forming the lyocell material. In addition, the emulsion may penetrate between the filaments.

[0170] The emulsion comprising at least the above components (a) and (b) may have hydrophobic properties. As a result, the lyocell material treated with the emulsion has excellent spreading properties.

[0171] In some embodiments, the lyocell material may contain a predetermined amount of the emulsion. In this case, the emulsion content may refer to OPU (wt%), which will be described later. "OPU" may refer to "oil pick-up ratio." For example, the lyocell material may contain the emulsion in an amount of 0.1 wt% or more, based on 100 wt% of the total lyocell material. In particular, the content of the emulsion may be 0.5 wt% or more, 1.0 wt% or more, 1.5 wt% or more, 2.0 wt% or more, 2.5 wt% or more, 3.0 wt% or more, particularly 3.5 wt% or more, 4.0 wt% or more, 4.2 wt% or more, 4.5 wt% or more, 5.0 wt% or more, 5.5 wt% or more, 6.0 wt% or more, 6.5 wt% or more, 7.0 wt% or more, 7.5 wt% or more, 8.0 wt% or more, 8.5 wt% or more, 9.0 wt% or more, or 9.5 wt% or more, based on 100 wt% of the total lyocell material. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less.

[0172] As a method for measuring the content (OPU) of the above-mentioned emulsion, for example, an extrusion method can be used. For example, a sample (e.g., 2 to 5 g, specifically, about 2.5 g) is collected (the weight of the collected sample is referred to as the sample weight) and the sample is placed in a syringe-shaped container. The material of the container is not particularly limited, but may be SUS (stainless steel). Next, a solvent (e.g., methanol) is placed in the container into which the sample has been placed (the amount of the solvent placed may be 10 ml or less (e.g., about 8 ml)). The solvent may be placed in a dropping manner when the sample is placed, and the dropping speed is controlled uniformly. Then, the solvent placed in the container as described above is allowed to fall from one end of the syringe-shaped container onto a plate. At this time, the plate is pre-weighed (the weighed weight is referred to as plate weight A), and the plate is installed so that the solvent dropped on the plate can fly away (i.e., evaporate) at a temperature of 120 to 130°C (e.g., 125°C). The above-described solvent injection and solvent dropping are performed three times, and a pressure (e.g., 98 N / cm) is applied to the sample using a syringe-shaped container. 2 (10 kgf / cm 2 ) or less, 49 N / cm 2 (5 kgf / cm 2 ) or less or 18-39 N / cm 2 (2-4 kgf / cm 2 )) and press the sample once. This sufficiently extrudes the solvent and emulsion present in the sample. Squeeze the sample by applying pressure until no solvent comes out. Afterwards, store the plate in a desiccator for 5 to 10 minutes, and measure the weight of the plate containing the sample (plate weight B). Then, calculate the emulsion content according to the formula below.

[0173] Food

[0174] Content of emulsion by extrusion (OPU, % or wt%)

[0175] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0176] In addition, the lyocell material that serves as the basis for the above-described emulsion content may be at least an emulsion-treated lyocell multifilament. For example, the lyocell material may be a lyocell multifilament that has been subjected to a primary emulsion treatment (described below), a lyocell multifilament that has been subjected to a primary emulsion treatment and a secondary emulsion treatment (described below), or a lyocell multifilament that has been subjected to both the above-described emulsion treatment and a binder, as described below. In addition, the lyocell multifilament that has been subjected to an emulsion and / or binder treatment may be crimped.

[0177] In relation to the emulsion of the present application, component (a) is a compound that can function as a type of lubricant or oil, and may be a component harmless to the human body enough to be used in food. Component (a) provides lubrication to the fibers fed into the crimper. If the lubrication is insufficient, the lyocell may clump together and not be able to escape the crimper. If the lubrication is too high, crimping may not occur properly. The content of component (a) can be controlled, as described below, taking these functions into account.

[0178] With respect to the above component (a), the type of fatty acid having 16 or more carbon atoms that forms the esterified product is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an esterified product that is harmless to the human body and can be used in food can be used.

[0179] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0180] Saturated fatty acids include, for example, palmitic acid (hexadecanoic acid, CH3(CH2) 14 COOH), margaric acid (heptadecanoic acid, CH3(CH2) 15COOH), stearic acid (octadecanoic acid, CH3(CH2) 16 COOH), nonadecylic acid (nonadecanoic acid, CH3(CH2) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2) 18 Examples include COOH). However, the types of saturated fatty acids available are not limited to these.

[0181] Unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32 O2) etc. However, the types of unsaturated fatty acids that can be used are not limited to these.

[0182] In some embodiments, the fatty acid is selected from the group consisting of palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid and arachidonic acid.

[0183] The upper limit of the carbon number of the fatty acid having 16 or more carbon atoms is not particularly limited, but may be, for example, 40 or less, 36 or less, 32 or less, 28 or less, 24 or less, or 20 or less.

[0184] With respect to the above component (a), the type of aliphatic monohydric alcohol forming it is not particularly limited. Any aliphatic monohydric alcohol capable of providing an ester compound that is harmless to the human body and suitable for use in food may be used.

[0185] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and they can have a linear or branched form.

[0186] In some embodiments, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. In particular, the carbon number of the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0187] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0188] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol, and stearyl alcohol.

[0189] In some embodiments, the component (a) may be an ester of isotridecanol and stearic acid (e.g., isotridecyl stearate). However, the types of usable component (a) are not limited thereto.

[0190] As described below, the content of the above-mentioned (a) component included in the emulsion can be adjusted in consideration of the function of the emulsion or the function of the (a) component.

[0191] The above (b) component, i.e., sorbitan and an ester of a fatty acid having 16 or more carbon atoms, is a compound that can function as a type of emulsifier and may be a component harmless to the human body enough to be used in food.

[0192] Since this component (b) has both hydrophilic and hydrophobic properties due to the polyhydric alcohol (i.e., sorbitan), it enables the component (a), which provides lubrication to the fiber, to be well dispersed in water as described below. In addition, components (a) and (b) used together not only increase the dispersibility of the emulsion as described above, but also lower the melting point, thereby ensuring the usability, handling, and stability of the emulsion. The content of the component (b) can be controlled as described below, taking these functions into consideration.

[0193] With respect to the above component (b), the type of fatty acid having 16 or more carbon atoms forming it is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an ester compound that is harmless to the human body and can be used in food may be used.

[0194] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0195] Saturated fatty acids include, for example, palmitic acid (hexadecanoic acid, CH3(CH2) 14 COOH), margaric acid (heptadecanoic acid, CH3(CH2) 15 COOH), stearic acid (octadecanoic acid, CH3(CH2) 16 COOH), nonadecylic acid (nonadecanoic acid, CH3(CH2) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2) 18 Examples include COOH). However, the types of saturated fatty acids available are not limited to these.

[0196] Unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32O2) etc. However, the types of unsaturated fatty acids that can be used are not limited to these.

[0197] In some embodiments, the fatty acid is selected from the group consisting of palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid and arachidonic acid.

[0198] The upper limit of the carbon number of the fatty acid having 16 or more carbon atoms is not particularly limited, but may be, for example, 40 or less, 36 or less, 32 or less, 28 or less, 24 or less, or 20 or less.

[0199] In some embodiments, the component (b) may be an ester of sorbitan and oleic acid (e.g., sorbitan monooleate). However, the types of usable component (b) are not limited thereto.

[0200] (b) The content of the component can be adjusted in consideration of the function of the component (b) and the function of the emulsion as described above.

[0201] In one example, the emulsion may comprise 100 parts by weight of the esterified product of (a) a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) 20 to 60 parts by weight of the esterified product of (sorbitan) and a fatty acid having 16 or more carbon atoms.

[0202] In particular, the emulsion of the present application may contain the component (b) in an amount of 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, or 50 parts by weight or more, relative to 100 parts by weight of the component (a). In addition, the upper limit of the content of the component (b) relative to 100 parts by weight of the component (a) may be, for example, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, or 25 parts by weight or less. When the above content range is satisfied, the surface of the emulsion-treated lyocell multifilament or lyocell tow may have hydrophobicity.

[0203] In one example, the emulsion may comprise 40 to 80 wt% of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, based on 100 wt% of the total emulsion. In particular, the content of the component (a) may be 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, 65 wt% or more, 70 wt% or more, or 75 wt% or more, based on 100 wt% of the total emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0204] In one example, the emulsion may contain an excess of component (a).

[0205] In one example, the emulsion may comprise 15 to 55 wt% of (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, based on 100 wt% of the total emulsion. In particular, the content of the (b) component may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, based on 100 wt% of the total emulsion. And the upper limit of the content may be, for example, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, or 25 wt% or less.

[0206] In one example, the emulsion may further contain water. A small amount of water may aid in emulsification.

[0207] The content of water is not particularly limited, but may be included as the remaining amount after excluding the sum of the contents of components (a) and (b) from 100 wt% of the entire emulsion. The content of water included in the emulsion (i.e., the remaining amount after excluding the sum of the contents of the remaining components excluding water) may be, for example, 10 wt% or less, 9 wt% or less, 8 wt% or less, 7 wt% or less, 6 wt% or less, 5 wt% or less, 4 wt% or less, 3 wt% or less, 2 wt% or less, or 1 wt% or less. And, the lower limit may be, for example, 0 wt% or more, 0.1 wt% or more, 0.5 wt% or more, or 1 wt% or more.

[0208]

[0209] [Method for manufacturing lyocell material]

[0210] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0211] In particular, the method for manufacturing the lyocell material may include a lyocell dope spinning step; a coagulation and multifilament obtaining step; a washing step; an emulsion treatment step; and a crimping step. In addition, the method for manufacturing the lyocell material may further include a binder treatment step; and other steps. In some embodiments, the steps are performed in the mentioned order.

[0212]

[0213] The emulsion treatment step may be performed before the crimping step, after the crimping step, or before and after the crimping step.

[0214] The emulsion treatment can be performed independently, for example, by spraying the emulsion of the above-described composition onto the lyocell multifilament or immersing the lyocell multifilament in the emulsion. As described above, the emulsion treatment can be performed so that the content of the emulsion in the lyocell material (e.g., OPU (wt%)) satisfies a predetermined range.

[0215] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0216] A method for manufacturing a lyocell material according to some embodiments, including a milk treatment step and a crimping step, is described in more detail below. The method of the present application may be performed by including one or more of the steps described below.

[0217]

[0218] <(a) Lyocell dope radiation stage>

[0219] This step is a step of spinning a lyocell spinning dope containing lyocell cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0220] Commercially available cellulose acetate filters are identified as a major source of microplastics. However, the amine oxide solvents used in the production of lyocell fibers are recyclable and biodegrade upon disposal, and lyocell materials do not generate any pollutants during the production process. Furthermore, lyocell tow biodegrades and is removed within a relatively short period of time, making lyocell a more environmentally friendly material than cellulose acetate.

[0221] In one example, the content of cellulose in the spinning dope may be 5 to 15 wt% based on 100 wt% of the total dope. If the content of cellulose is too low, it is difficult to implement the properties of lyocell fibers, and if the content exceeds the above range, it is difficult to dissolve in a solvent. Considering this, the content of cellulose in the spinning dope may be 6 wt% or more, 7 wt% or more, 8 wt% or more, 9 wt% or more, or 10 wt% or more, based on 100 wt% of the total dope, and the upper limit thereof may be, for example, 14 wt% or less, 13 wt% or less, 12 wt% or less, 11 wt% or less, 10 wt% or less, or 9 wt% or less, based on 100 wt% of the total dope. The term "cellulose" may refer to "lyocell cellulose".

[0222] In one example, the radiation dope may include an N-methylmorpholine-N-oxide (NMMO) aqueous solution. The aqueous solution may include, for example, 80 to 95 wt% of N-methylmorpholine-N-oxide and 5 to 20 wt% of water, taking into account the degree of dissolution of cellulose and the process temperature.

[0223] In one example, the cellulose or cellulose pulp may have an alpha-cellulose content of 85 to 97 wt% relative to 100 wt% of total cellulose and / or cellulose pulp.

[0224] In one example, the cellulose or cellulose pulp may have a hemicellulose content of 1 wt% to 15 wt% relative to 100 wt% of the total cellulose and / or cellulose pulp. By adjusting the hemicellulose content within the above range, stable physical properties (e.g., hardness or suction resistance implementation) and processability of the lyocell material can be more easily secured.

[0225] Additionally, in some embodiments of the present application, the degree of polymerization (DPw) of the cellulose may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose and / or alpha-cellulose and / or hemicellulose within the cellulose pulp.

[0226] In the above-mentioned radiation step, the shape of the detention device for discharging the radiation dope is not particularly limited. For example, a donut-shaped radiation detention device may be used.

[0227] The nozzle temperature of the spinneret, particularly the spin temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the spinneret may vary depending on the spin temperature, which may impede ejection, the spin temperature may be, for example, between 100°C and 120°C or lower, or between 100°C and 110°C or lower.

[0228] In one example, the step of spinning the above-described spinning dope may be performed under controlled spinning conditions so that the single filament fineness may be 1.67 to 8.89 dtex (1.5 to 8.0 denier). For example, one or more spinning conditions among the discharge amount and spinning speed of the above-described spinning dope may be appropriately controlled so that the single filament fineness included in the lyocell material satisfies 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness refers to the fineness of one single monofilament separated from the multifilament.

[0229] In particular, the single fiber count of the filament may be, in particular, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, in particular, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and securing fairness of a filter for smoking articles.

[0230] The radiation dope discharged through the radiation detention can go through the coagulation step described below.

[0231]

[0232] <(b) Coagulation and multifilament production step>

[0233] In this step, the radiated lyocell radiant dope is coagulated, and lyocell multifilament can be obtained.

[0234] The above coagulation may be carried out in a manner in which the radiant dope comes into contact with air and / or a coagulating liquid.

[0235] In one example, the coagulation may include a first coagulation step of supplying cooling air to the radiated lyocell dope; and a second coagulation step of introducing the first coagulated radiated dope into a coagulation solution to coagulate it.

[0236] According to the above-described solidification method, the lyocell dope discharged from the spinneret can be primarily solidified in the space (air gap section) between the spinneret and the solidification tank. For example, cooling air can be supplied from the inside of the spinneret to the outside of the spinneret through this air gap section from an air-cooling unit located inside the spinneret. Alternatively, primary solidification can be achieved by a so-called air quenching method or means known in the relevant field.

[0237] In one example, the upper temperature limit of the cooling air used in the first coagulation step may be, for example, 15°C or lower. In particular, the cooling air may be air having a temperature of 14°C or lower, 13°C or lower, 12°C or lower, 11°C or lower, or 10°C or lower. If the temperature exceeds the temperature, the solidification of the radiation dope by the air may not be sufficient, and the radiation-related processability may be poor.

[0238] The lower limit of the cooling air temperature may be determined by considering factors such as the spinning processability and / or the cross-sectional uniformity of the filament. For example, if the temperature of the cooling air is below 4°C, the surface of the spinneret cools, the surface of the filament becomes uneven, and the spinning processability also deteriorates. Considering this, the cooling air temperature may be 5°C or higher, 6°C or higher, 7°C or higher, 8°C or higher, or 9°C or higher.

[0239] The degree to which the cooling air is supplied can be controlled taking into account sufficient coagulation, spinning processability, and the influence on the physical properties of the filament. For example, 70 to 400 Nm per pin. 3 / h can be supplied to the radiation dope discharged at a wind speed of 100 Nm 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or more or 250 Nm 3 / h or more, and the upper limit of the airflow is, for example, 350 Nm 3 / h or less, 300 Nm 3 / h or less, 250 Nm 3 / h or less, 200 Nm 3 / h or less or 150 Nm 3 / h can be less than or equal to.

[0240] After the first coagulation step as described above, the cooled spinning dope can be supplied to a coagulation tank or bath containing a coagulating solution (secondary coagulation step). For proper coagulation to proceed, the temperature of the coagulating solution can be, for example, 30°C or lower or 25°C or lower. Furthermore, the temperature of the coagulating solution can be 10°C or higher, 15°C or higher, or 20°C or higher. By maintaining the above temperature, the coagulation rate can be appropriately maintained.

[0241] The type of coagulant for the secondary coagulation described above is not particularly limited. For example, the coagulant may contain one or more of water and N-methylmorpholine-N-oxide (NMMO).

[0242] Although not particularly limited, when the coagulant contains water and NMMO, the water content in the coagulant may be 60 to 90 wt% and the NMMO content may be 10 to 40 wt% based on 100 wt% of the total coagulant. Alternatively, the coagulant may contain 70 to 80 wt% of water and 20 to 30 wt% of NMMO based on 100 wt% of the total coagulant. The concentration of the coagulant may be controlled to be maintained during the manufacturing process using a sensor or the like.

[0243]

[0244] <(c) Washing stage>

[0245] If necessary, the lyocell multifilaments may be washed after the coagulation and multifilament steps described above. This washing may remove any remaining NMMO and / or other impurities within the filaments.

[0246] There are no specific restrictions on the method of washing. For example, washing can be accomplished by introducing the coagulated lyocell multifilament into a washing tank using a traction roller. Alternatively, washing can be accomplished by spraying the washing solution as the traction roller moves the lyocell multifilament to the next stage.

[0247] The components of the washing liquid are not particularly limited. For example, the washing liquid may contain water and may also contain known additives.

[0248] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0249] For example, if the step of obtaining lyocell multifilament further includes a step of pulling the lyocell multifilament by a first roller, and the washing step further includes a step of pulling the lyocell multifilament by a second roller, the moisture content of the lyocell multifilament can be controlled by a ratio of the rotation speeds of the second roller to the first roller. In some embodiments, the rotation speed of the first roller can be different from the rotation speed of the second roller. In some embodiments, the rotation speed of the second roller can be greater than the rotation speed of the first roller. In addition, the pulling of the lyocell multifilament in the washing step can be performed by one or more rollers, and if the pulling of the lyocell multifilament in the washing step is performed by two or more rollers, the second roller can be the last roller.

[0250] By controlling the ratio of the rotational speed of the second roller to the first roller, the strength and elongation of the lyocell multifilament can be controlled. In particular, the ratio of the rotational speed of the second roller to the first roller can be 1.00 to 1.15. When the ratio of the rotational speed of the second roller to the first roller is less than 1.00, the performance of imparting crimp to the lyocell multifilament may be deteriorated due to a decrease in the modulus value caused by an increase in the strength of the monofilament. Conversely, when the ratio of the rotational speed of the second roller to the first roller exceeds 1.15, a decrease in the strength of the monofilament may occur, and the dimensional stability of the crimp of the lyocell multifilament may be deteriorated.

[0251] In some embodiments, the method for manufacturing a lyocell material further includes a step of pressing the lyocell multifilament, and the step of pressing the lyocell multifilament may be included between the washing step and the crimping step. Although not particularly limited, the pressing of the lyocell multifilament may be in the range of 29.42 N / cm² to 34.33 N / cm² (3.0 kgf / cm 2 3.5 kgf / cm 2 ) can be performed.

[0252] By performing the step of pressurizing the lyocell multifilament, the moisture content of the lyocell multifilament can be controlled as described above.

[0253]

[0254] <(d) Milk processing stage>

[0255] If necessary, a step of emulsifying the lyocell multifilament may be performed. This step involves applying an emulsion containing the aforementioned ingredients to the surface of the filament. This emulsion treatment reduces friction on the filament and facilitates crimp formation in the crimp application step described below. If the emulsion treatment is performed two or more times, as described below, the process may be referred to as a primary emulsion treatment or a secondary emulsion treatment, depending on the order of application.

[0256] Although not specifically limited, the emulsion treatment may be carried out by immersing the lyocell multifilaments in a bath filled with the emulsion so that the lyocell multifilaments are completely submerged in the emulsion. Alternatively, the emulsion may be treated by spraying the emulsion liquid while being moved to the next stage by a traction roller.

[0257] In order to ensure that the amount of emulsion applied to the lyocell multifilament after the emulsion treatment as described above is constant, an additional process may be performed in which a roll, etc., positioned before and / or after the emulsion treatment step squeezes out the emulsion from the surface of the lyocell multifilament.

[0258] In one example, the emulsion treatment may be performed so that the oil content (OPU: oil pick up ratio (wt%)) satisfies 1.0 wt% or more based on at least 100 wt% of the emulsion-treated lyocell multifilament. At this time, the emulsion-treated lyocell multifilament may be, for example, lyocell multifilament to which the lyocell material has been first emulsion-treated, lyocell multifilament to which the first emulsion-treated and second emulsion-treated (see description below) have been applied, or lyocell multifilament to which a binder, which will be described later, has been applied together with the emulsion-treated as described above. In addition, the lyocell multifilament to which the emulsion-treated and / or binder-treated as described above has been crimped.

[0259] In particular, the content of the emulsion in the at least emulsion-treated lyocell multifilament may be at least 0.5 wt%, at least 1.0 wt%, at least 1.5 wt%, at least 2.0 wt%, at least 2.5 wt%, at least 3.0 wt%, particularly at least 3.5 wt%, at least 4.0 wt%, at least 4.2 wt%, at least 4.5 wt%, at least 5.0 wt%, at least 5.5 wt%, at least 6.0 wt%, at least 6.5 wt%, at least 7.0 wt%, at least 7.5 wt%, at least 8.0 wt%, at least 8.5 wt%, at least 9.0 wt%, or at least 9.5 wt%, based on 100 wt% of the total of the emulsion-treated lyocell multifilament. And, the upper limit may be, in particular, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on at least 100 wt% of the lyocell multifilament treated with the emulsion. At this time, the above content may mean the dry weight after the solvent (e.g., water) or liquid component that may be included in the emulsion has evaporated.

[0260] When the emulsion of the above-described composition is processed within the above content range, the hydrophilic properties of the lyocell material can be supplemented.

[0261] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0262] In some embodiments, one or more of the steps described above may be controlled so that the single filament fineness of the filaments forming the lyocell multifilament can be from 1.67 to 8.89 dtex (1.5 to 8.0 denier). The single filament fineness refers to the fineness of one single monofilament separated from the multifilament.

[0263] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and ensuring fairness of a filter for smoking articles.

[0264] Although not specifically limited, the step controlled to ensure the above-described single-fiber range may be the above-described spinning step. Alternatively, the above-described spinning, coagulation, washing, and emulsion treatment steps may all be controlled to ensure the above-described single-fiber range.

[0265] Furthermore, in some embodiments, in the production of lyocell material, the moisture content of the lyocell multifilament may be controlled prior to the step of imparting crimp to the lyocell multifilament. Thus, crimp can be imparted to the lyocell multifilament with the controlled moisture content, and changes in elongation and strength of the lyocell material due to the imparting of crimp can be controlled. As a result, the dimensional stability of the crimp of the lyocell material imparted with crimp can satisfy a predetermined range.

[0266] In some embodiments, the method for manufacturing lyocell material further includes a step of pressing the lyocell multifilament, and the step of pressing the lyocell multifilament may be included between the step of emulsifying and the step of crimping. Although not particularly limited, the pressing of the lyocell multifilament is 29.42 N / cm² to 34.33 N / cm² (3.0 kgf / cm 2 3.5 kgf / cm 2 ) can be performed.

[0267] By performing the step of pressurizing the lyocell multifilament, the moisture content of the lyocell multifilament can be controlled as described above.

[0268]

[0269] <(e) Crimp application step>

[0270] The crimping step is a step in which pressure is applied to the emulsion-treated lyocell multifilament through steam and / or a press roller to obtain a crimped multifilament, preferably a crimped tow. The crimping step may be referred to as a crimping step. In the present specification, the terms “emulsion-treated” and “emulsified” may be used interchangeably.

[0271] Crimping imparts waves to the lyocell multifilament, giving the fibers bulky properties. Crimping can be performed using any known crimping device, such as a stuffer box and / or a steam box. The usable crimping device is not particularly limited, as long as it can apply one or more of the pressures described below.

[0272] In one example, a crimping step may be performed on lyocell multifilaments whose moisture content has been controlled through a washing step or an emulsion treatment step.

[0273] In one example, the crimping step can be performed in such a way that the pressurization of the lyocell multifilament by the press roller and the application of steam are performed simultaneously.

[0274] In one example, the crimping step is performed on the lyocell multifilaments prior to feeding into the crimping device (particularly the press roller) at a pressure of 0.98 to 19.61 N / cm. 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying steam.

[0275] In one example, the crimping step may be performed by pressing the lyocell multifilament with a press roller to form wrinkles in the lyocell multifilament.

[0276] In one example, the crimping step is performed by applying a pressure of 14.71 to 39.23 N / cm to the lyocell multifilament fed into the crimping device using a press roller. 2 (1.5 to 4.0 kgf / cm 2 ) can be performed while applying pressure.

[0277] For example, 15.69 N / cm 2 (1.6 kgf / cm 2 ) above, 16.67 N / cm 2(1.7 kgf / cm 2 ) or more, 17.65 N / cm 2 (1.8 kgf / cm 2 ) above, 18.63 N / cm 2 (1.9 kgf / cm 2 ) above, 19.61 N / cm 2 (2.0 kgf / cm 2 ) or more, 20.60 N / cm 2 (2.1 kgf / cm 2 ) above, 21.58 N / cm 2 (2.2 kgf / cm 2 ) above, 22.56 N / cm 2 (2.3 kgf / cm 2 ) above, 23.54 N / cm 2 (2.4 kgf / cm 2 ) or more or 24.52 N / cm 2 (2.5 kgf / cm 2 ) or more pressure can be applied to the lyocell multifilament through the press roller. Also, 38.25 N / cm 2 (3.9 kgf / cm 2 ) below, 37.27 N / cm 2 (3.8 kgf / cm 2 ) below, 36.29 N / cm 2 (3.7 kgf / cm 2 ) below, 35.31 N / cm 2 (3.6 kgf / cm 2 ) below, 34.33 N / cm 2 (3.5 kgf / cm 2 ) below, 33.35 N / cm 2 (3.4 kgf / cm 2 ) below, 32.37 N / cm 2 (3.3 kgf / cm 2 ) below, 31.39 N / cm 2 (3.2 kgf / cm 2 ) below, 30.41 N / cm 2 (3.1 kgf / cm 2 ) below, 29.42 N / cm2 (3.0 kgf / cm 2 ) below, 28.44 N / cm 2 (2.9 kgf / cm 2 ) below, 27.46 N / cm 2 (2.8 kgf / cm 2 ) below, 26.48 N / cm 2 (2.7 kgf / cm 2 ) or less, 25.50 N / cm 2 (2.6 kgf / cm 2 ) or less or 24.52 N / cm 2 (2.5 kgf / cm 2 ) The following pressure can be applied by the press roller.

[0278] The pressure of the press roller is within the above range. If the pressure is less than the above range, the desired number of crimps may not be sufficiently formed. Furthermore, if the roller pressure exceeds the above range, the pressing force may be too strong, preventing the filament from being smoothly fed into the crimping device or from passing through the crimping device. Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0279] In one example, the pressure on the lyocell multifilament was 0.98 to 19.61 N / cm using the top plate. 2 (0.1 to 2 kgf / cm 2 ) can be applied to the lyocell multifilament. Additionally, the upper plate can apply pressure to the lyocell multifilament as it passes through or passes through the press roller.

[0280] For example, the pressure applied by the upper plate is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) below the pressure can be applied by the upper plate.

[0281] Furthermore, the pressure of the upper plate, which moves up and down to provide uniform crimp after passing through the press roller, is 0.98 N / cm 2 (0.1 kgf / ㎠), the upper plate may not be fixed due to the pressure inside the crimp device, causing the tow to remain in the crimp device for a long time, preventing the continuity of the process. 19.61 N / cm 2 If it exceeds (2 kgf / ㎠), the steam may not be discharged smoothly inside the crimp device, which may result in an irregular crimp shape.

[0282] In one example, the crimping step may employ a doctor blade that applies a predetermined pressure to the lyocell multifilament. The doctor blade controls the residence time of the filaments fed into the crimper crimping device, thereby contributing to the control of the number of crimps. Such a doctor blade may be positioned, for example, in the path of the lyocell multifilaments that are pressed by the roller described above and then discharged from the roller pressure point.

[0283] In one example, the crimping step uses a doctor blade to apply a pressure of 0.98 to 19.61 N / cm to the lyocell multifilaments passed through the rollers of the crimping device. 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying pressure.

[0284] For example, the pressure applied by the doctor blade is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2 ) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) The following pressures can be applied by the doctor blade.

[0285] In one example, the crimping step may be performed at a temperature ranging from 120 to 250°C. If the temperature is too low, the shape stabilization effect of the crimp may not be good, and if the temperature is too high, the concentration of the oil content in the crimping device may increase, making crimp formation difficult. Therefore, considering the steam pressure described above, etc., the temperature may be appropriately controlled in a range of 130°C or higher, 140°C or higher, or 150°C or higher, and 200°C or lower, 180°C or lower, or 160°C or lower.

[0286]

[0287] <(f) Binder processing step>

[0288] In one example, the method may further comprise a step of treating the lyocell multifilament obtained by the emulsion-treated or crimp-imparting step with a binder.

[0289] When manufacturing a smoking article filter using lyocell material (e.g., lyocell tow), an additional binder may be used. The binder increases the hardness of the lyocell-containing smoking article filter, thereby preventing problems such as filter jamming during the filter manufacturing process or cigarette manufacturing.

[0290] There are no specific limitations on the method for coating the lyocell material with a binder. For example, the emulsion treatment may be performed by immersing the lyocell multifilament in a binder (or binder solution) bath so that the lyocell multifilament is completely submerged in the binder. Alternatively, the binder coating on the lyocell multifilament may be performed by spraying (or spraying) the binder (or binder solution) using a nozzle.

[0291] The types and components of available binders are as described above, so they are omitted.

[0292] In one example, the binder (or binder solution) may further include a solvent in addition to the above-described components. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin, for example. When the binder (or binder solution) includes a solvent, the solvent content may be, for example, about 20 to 80 wt% or about 40 to 60 wt% based on 100 wt% of the total binder (or binder solution).

[0293] The above binder treatment may be performed at a level that can achieve the purpose of the above-described binder treatment. For example, the binder treatment may be performed so that the binder content satisfies a range of 20 wt% or less, for example, 8 to 15 wt%, based on 100 wt% of the emulsion and binder-treated lyocell multifilament. In this case, the content may refer to the dry weight after the solvent or liquid component that may be included in the binder has evaporated.

[0294] After the binder is coated on the lyocell multifilament, drying of the binder may be performed. The drying temperature is not particularly limited, but drying may be performed at room temperature (approximately 10 to 35°C), for example.

[0295]

[0296] <(g) Other steps>

[0297] After crimping, additional appropriate post-processing may be performed.

[0298] In one example, a secondary emulsion treatment (g1) may be additionally performed. The secondary emulsion treatment may further impart flexibility to the tow. The secondary emulsion treatment may be performed in the same manner as or in accordance with the emulsion treatment step (d) described above.

[0299] In particular, secondary emulsion treatment can be performed by applying emulsion to lyocell tow that has undergone a crimper process. This can be beneficial for various processes involved in the manufacture of filters for smoking articles. For example, secondary emulsion treatment can not only ensure that the fibers and filter are easily spreadable in air during the spreading process, but also limit fiber breakage during the drawing process.

[0300] The secondary emulsion treatment described above may be performed before or after the binder treatment. Alternatively, the secondary emulsion treatment may be performed regardless of whether the binder treatment is performed.

[0301] Even in cases where the secondary emulsion treatment as described above is performed, the secondary emulsion treatment process can be performed so that the content of the emulsion or OPU content in the material satisfies the range described above.

[0302] In one example, a drying process (g2) may be additionally performed. This drying process may be performed, for example, at a temperature ranging from 100 to 130°C. The drying process method or method is not particularly limited, and any known technique may be utilized. For example, this may be accomplished by applying hot air to the tow, passing the tow through a temperature-controlled room for a set period of time, or leaving the tow in that room.

[0303]

[0304] The lyocell material according to the present invention can be obtained by the method for producing a lyocell material as described above.

[0305] The lyocell material according to the present invention may be a material obtainable by the method for producing a lyocell material as described above.

[0306]

[0307] [Smoking items]

[0308] Although not specifically limited, the lyocell material manufactured by the above method may be incorporated into a smoking article. The smoking article may be an aerosol-generating article. The aerosol-generating article may include an aerosol-generating material or an aerosol-forming substrate.

[0309] For example, lyocell material may be incorporated into a combustible cigarette. As another example, lyocell material may be incorporated into a heated cigarette, and the heated cigarette may be used in conjunction with an aerosol generating device.

[0310] For example, when used as a heated smoking article, the smoking article may be separately inserted into an aerosol generating device. Here, the aerosol generating device may include a receiving groove in which the aerosol generating article can be received, and in addition, may include a heater for heating the aerosol generating article so as to generate an aerosol, a control unit for controlling the overall operation of the aerosol generating device, a battery for providing power used for the operation of the aerosol generating device, and a detector for recognizing that the aerosol generating article has been inserted into the aerosol generating device.

[0311] A smoking article may include a tobacco medium, a filter for a smoking article, and a wrapper, wherein the filter for the smoking article may be positioned at one end of the tobacco medium, for example, at the rear end or the front end. The tobacco medium and the filter for the smoking article may each include a single segment, or may independently include multiple segments.

[0312] The above tobacco medium comprises a tobacco substance, and the tobacco substance comprises nicotine. In addition, the tobacco medium may additionally comprise one or more excipients.

[0313] Excipients may include binders, fillers, and other additives. For example, the tobacco medium included in the tobacco medium portion may be manufactured in the form of granules containing tobacco substances and excipients.

[0314] For example, to maintain the shape, strength, and mass of the tobacco medium, a filler may be additionally included. For example, lyocell material may be included in the tobacco medium. Furthermore, lyocell material may be used as a filler.

[0315] The above wrapper can be subdivided into a cigarette paper wrapping the tobacco medium, a filter paper wrapping the filter, and a tipping wrapper combining the tobacco medium and the filter.

[0316]

[0317] [Filter for smoking items]

[0318] Lyocell material can be used in filters for smoking articles. The lyocell material may be lyocell tow. In one example, the lyocell tow includes crimped lyocell multifilament.

[0319] For example, the present application relates to a filter for a smoking article. The filter for the smoking article comprises a lyocell material, which may be the same as described above. Furthermore, the filter for the smoking article comprises lyocell tow, which may be the same as described above.

[0320] In addition, the lyocell material includes the emulsion in an amount of 0.1 wt% or more relative to 100 wt% of the total lyocell material. In addition, the description of the emulsion components and content according to some embodiments is the same as described above.

[0321] In some embodiments, the single fiber count of the filaments forming the lyocell multifilament may be from 1.67 to 8.89 dtex (1.5 to 8.0 denier). The specific values ​​are the same as those described above.

[0322] In some embodiments, the crimped lyocell multifilament may be a lyocell material having a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier), and preferably, the lyocell material may be lyocell tow. The specific values ​​are the same as described above.

[0323] In one example, the crimped lyocell multifilament may have crimps of 3.94 to 19.69 per centimeter (10 to 50 per inch). The specific values ​​are the same as those described above.

[0324] In one example, the above-described smoking article filter may further include a binder on the surface of the crimped lyocell multifilament or between the crimped lyocell multifilaments. The binder increases the hardness of the tow-made smoking article filter, thereby preventing problems such as filter jamming during the filter manufacturing process or the cigarette manufacturing process. The description of the types, components, and contents of usable binders is the same as described above.

[0325] In one example, the filter for the smoking article may further include a wrapping paper (which may be referred to as a wrapping paper, a filter paper, or a filter wrapping paper). For example, the wrapping paper may be porous paper or non-porous paper that wraps the lyocell tow described above and can maintain the filter shape (e.g., a cylinder or a cylindrical shape).

[0326] In some embodiments, the filter for the smoking article may have a predetermined shape and size.

[0327] For example, the filter may have a rod shape. In particular, the filter for the smoking article may have a cylindrical shape.

[0328] Additionally, the filter may have a length of, for example, 10 to 50 mm. Specifically, the length of the filter may have a lower limit of 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, 35 mm or more, 40 mm or more, or 45 mm or more, and an upper limit of 45 mm or less, 40 mm or less, 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0329] In some embodiments, the filter having the length may have a circular cross-section, and the circumference of the circular cross-section may be from 10 to 40 mm. For example, the circumference 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 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0330] In one example, the filter for the smoking article may include lyocell tow and filter paper. The description of the lyocell tow and filter paper is the same as described above, and thus is omitted.

[0331] The above-described paper may be porous paper or non-porous paper that can wrap the above-described lyocell tow and maintain a filter shape (e.g., a cylinder or a cylindrical shape).

[0332] In one example, when a porous paper is used, the paper may have a porosity of 10 to 50,000 CU (Coresta Unit). A Coresta Unit is 1 cm at a pressure difference of 1 kPa. 2 The volume flow rate (cm) of air passing through the substrate sample (i.e., porous paper) 3 min -1) can be defined. In particular, the lower limit of the porosity of the paper may be, for example, 1000 CU or more, 5000 CU or more, 10000 CU or more, 15000 CU or more, 20000 CU or more, 25000 CU or more, 30000 CU or more, 35000 CU or more, 40000 CU or more, or 45000 CU or more, and the upper limit may be, for example, 45000 CU or less, 40000 CU or less, 35000 CU or less, 30000 CU or less, 25000 CU or less, or 20000 CU or less. In some embodiments, the paper may have a porosity within a range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0333] In one example, the weight of the above paper is 15 to 60 g / cm 2　 It can be. In particular, the lower limit of the basis weight of the above-mentioned paper is, for example, 20 g / cm 2 Above, 25 g / cm 2 Above, 30 g / cm 2 Above, 35 g / cm 2 Above, 40 g / cm 2 Above, 45 g / cm 2 Above, 50 g / cm 2 or more than 55 g / cm 2 It can be ideal, and the upper limit is, for example, 55 g / cm 2 Below 50 g / cm 2 Below 45 g / cm 2 Below 40 g / cm 2 Below 35 g / cm 2 Below 30 g / cm 2 Below 25 g / cm 2 Less than or equal to 20 g / cm 2 may be less than or equal to 16 g / cm. In some embodiments, the paper is 2 Above, 17 g / cm 2 Above, 18 g / cm 2 Above, 19 g / cm2 Above, 20 g / cm 2 or more than 21 g / cm 2 Above, and 25 g / cm 2 Below, 24 g / cm 2 Below, 23 g / cm 2 Below, 22 g / cm 2 Less than or equal to 21 g / cm 2 It can have the following weights:

[0334] Although not particularly limited, the weight of the rod-shaped filter may be 50 mg or more. In particular, the weight of the filter may have a lower limit of, for example, 100 mg or more, 150 mg or more, or 200 mg or more, and an upper limit of, for example, 500 mg or less, 450 mg or less, 400 mg or less, 350 mg or less, 300 mg or less, 250 mg or less, or 200 mg or less.

[0335] Descriptions of other smoking articles filters and materials included therein are the same as those described above, so they are omitted.

[0336]

[0337] [Method for manufacturing filters for smoking articles]

[0338] For example, the present application relates to a method for manufacturing a filter for a smoking article. The method may be a method for manufacturing a lyocell smoking article filter as described above, and may include a method for manufacturing the lyocell material described above.

[0339] Regarding the manufacturing method for a filter for smoking articles, the remaining steps, excluding the filter manufacturing step, are identical to those described for the lyocell material described above, and therefore, their description is omitted. Any descriptions that overlap with those described above are also omitted.

[0340] The steps for manufacturing a filter can be appropriately performed by those skilled in the art according to known methods. For example, a filter can be manufactured by forming a lyocell-filled paper into a rod shape. Alternatively, a filter can be manufactured by cutting a rod-shaped lyocell-filled filter paper into an appropriate length. The description of the paper is as described above.

[0341] Although not specifically limited, prior to filling the filter paper with lyocell material, additional treatment with an opening agent or plasticizer may be performed on the lyocell material. Opening the lyocell material can increase the surface area of ​​the lyocell material. For example, opening the lyocell material can be achieved by applying an external force in the longitudinal, transverse, and / or thickness directions.

[0342] Preferably, the lyocell material used in the manufacture of filters for smoking articles may be lyocell tow.

[0343] Although not particularly limited, the filter for a smoking article may additionally include known cellulose acetate multifilaments, provided that the purpose of the present invention is not impaired. The cellulose acetate multifilaments may be mixed with lyocell multifilaments. The cellulose acetate multifilaments may be included in a segment distinct from the segments containing the lyocell multifilaments.

[0344] According to the present application, a lyocell material for a smoking article filter that can replace commercially available cellulose acetate (CA) and a smoking article filter comprising the same are provided. In particular, by using a lyocell material that satisfies a predetermined crimp dimensional stability, the performance of the smoking article filter and the time and cost required for manufacturing the smoking article filter can be reduced.

[0345] The following specific examples of the invention will further illustrate its functions and effects. However, these examples are presented as illustrative examples and do not limit the scope of the invention in any way.

[0346]

[0347] Lyocell material was manufactured using the same process as described in the manufacturing example below. Conditions not specifically mentioned were within the scope of the above description.

[0348]

[0349] [Manufacturing example]

[0350] A spinning dope for producing tow having a concentration of 11 wt% was prepared by mixing cellulose pulp having an alpha-cellulose content of 93.9% and a degree of polymerization (DPw) of 820 with an NMMO / H2O solvent having a propyl gallate content of 0.01 wt%. Then, while maintaining the spinning temperature at 110°C in the spinning nozzle, the discharge amount and spinning speed were appropriately controlled, and the spinning dope was spun.

[0351] The spinning dope in the filament phase discharged from the spinning nozzle was supplied to the coagulating liquid (the coagulating liquid having a concentration including 75 wt% of water and 25 wt% of NMMO based on 100 wt% of the total coagulating liquid, and having a temperature of approximately 15°C) in the coagulating tank through the air gap section. At this time, the spinning dope was primarily coagulated by cooling air at a temperature of 8°C and an air flow rate of 120 N㎥ / h in the air gap section. Thereafter, the primarily coagulated spinning dope was secondarily coagulated by being immersed in the coagulating liquid, thereby obtaining lyocell multifilaments. The lyocell multifilaments in the coagulating liquid were transported by a traction roller. In addition, the concentration of the coagulating liquid was continuously monitored using a sensor and a refractometer.

[0352] Then, the coagulated lyocell multifilament was washed. Specifically, the filament was introduced into a traction roller, and the NMMO remaining within the filament was removed with a washing solution sprayed from a washing device. Then, the washed filament was immersed in a bath designed to have a predetermined emulsion concentration.

[0353] The filament is fed to a nip roll installed in the bath discharge section at 29.42 N / cm 2 (3.0 kgf / cm 2 ) The moisture content of the lyocell multifilament was controlled by pressure treatment. After that, the filament was fed into a crimp machine for crimping. In particular, the pressure of the press roller was 24.52 N / cm 2 (2.5 kgf / cm 2 ), the pressure of the doctor blade is 4.90 N / cm 2 (0.5 kgf / cm 2 ) was set to manufacture the toe.

[0354] To prevent static electricity and provide flexibility to the manufactured tow, a secondary emulsion treatment was performed, and immediately after the treatment, the tow product was dried by passing it through a continuous drying device set at 120°C.

[0355]

[0356] The single fiber count of the manufactured tow was 2.22 to 3.89 dtex (2.0 to 3.5 denier), the total fiber count was 3,333 to 5,000 tex (30,000 to 45,000 denier), and the crimp count was 9.84 to 11.81 ea / cm (25 to 30 ea / inch).

[0357]

[0358] Example 1

[0359] Lyocell tow was manufactured according to the above manufacturing example, but the ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulating solution was 1.05.

[0360]

[0361] Example 2

[0362] Lyocell tow is manufactured according to the above manufacturing example, but the pressure of the nip roll is 34.32 N / cm 2 (3.5 kgf / cm 2 ) was. The ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulant was 1.05.

[0363]

[0364] Example 3

[0365] Lyocell tow is manufactured according to the above manufacturing example, but the pressure of the nip roll is 34.32 N / cm 2 (3.5 kgf / cm 2 ) was. The ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulant was 1.10.

[0366]

[0367] Example 4

[0368] Lyocell tow was manufactured according to the above manufacturing example, but the ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulating solution was 1.10.

[0369]

[0370] Example 5

[0371] Lyocell tow was manufactured according to the above manufacturing example, but the ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulating solution was 1.15.

[0372]

[0373] Example 6

[0374] Lyocell tow is manufactured according to the above manufacturing example, but the pressure of the nip roll is 34.32 N / cm 2 (3.5 kgf / cm 2 ) was. The ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulant was 1.15.

[0375]

[0376] Comparative Example 1

[0377] Lyocell tow is manufactured according to the above manufacturing example, but the pressure of the nip roll is 68.65 N / cm 2 (7.0 kgf / cm 2 ) was. The ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulant was 1.00.

[0378]

[0379] Comparative Example 2

[0380] Lyocell tow is manufactured according to the above manufacturing example, but the pressure of the nip roll is 9.81 N / cm 2 (1.0 kgf / cm 2 ) was. The ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulant was 1.10.

[0381]

[0382] Comparative Example 3

[0383] Lyocell tow is manufactured according to the above manufacturing example, but the pressure of the nip roll is 49.03 N / cm 2 (5.0 kgf / cm 2 ) was. The ratio of the rotation speed of the last traction roller in the washing step to the traction roller in the coagulant was 1.15.

[0384]

[0385] Experiment 1

[0386] The moisture content of the lyocell materials of Examples 1 to 6 and Comparative Examples 1 to 3 was measured. The moisture content of each lyocell material was measured before crimping, and the moisture content was measured according to Equation 2 below.

[0387] [Formula 2]

[0388]

[0389] In Equation 2, W represents the weight of the sample measured before drying, and D represents the weight of the sample measured after drying.

[0390] The ratio of rotation speed, pressure of the nip roll and moisture content of Examples 1 to 6 and Comparative Examples 1 to 3 are as shown in Table 1 below.

[0391]

[0392] Pressure of vinyl roll at rotation speed (N / cm) 2 (kgf / cm 2 ))Moisture content (%)Example 11.0529.42 (3.0)28421.0534.32 (3.5)21531.1034.32 (3.5)24541.1029.42 (3.0)29751.1529.42 (3.0)31261.1534.32 (3.5)236Comparative example 11.0068.65 (7.0)11821.109.81 (1.0)41531.1549.03 (5.0)142

[0393]

[0394] Referring to Table 1, it is confirmed that the moisture content of the lyocell materials of Examples 1 to 6 is within the range of 200% to 350%, and the moisture content of the lyocell materials of Comparative Examples 1 to 3 is less than 200% or greater than 350%.

[0395]

[0396] Experiment 2

[0397] For the lyocell materials of Examples 1 to 6 and Comparative Examples 1 to 3, the elongation, strength, and crimp morphological stability were measured.

[0398] The elongation and strength were measured using a low-speed extension tensile tester from INSTRON. The tensile speed of the monofilament during the measurement was 60 mm / min.

[0399] The morphological stability was measured using FAVIMAT+ according to Equation 1 below. The initial load at the time of 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 each 5 seconds.

[0400] [Formula 1]

[0401] Shape stability of crimp (%) = (L0-L b ) / (L0-L)·100

[0402] In Equation 1, L represents the length of the monofilament measured under the condition of initial load (0.01 cN / tex), L0 represents the length of the monofilament measured under the condition of load of 5 cN / tex, and L b represents the length of the monofilament measured when the load of 5 cN / tex is removed and then restored (0.01 cN / tex).

[0403] The strength, elongation, and crimp morphological stability of Examples 1 to 6 and Comparative Examples 1 to 3 are as shown in Table 2 below.

[0404]

[0405] Elongation (%) Strength (cN / tex (g / de)) Shape stability of crimp (%) Example 18.1 16.00 (0.68) 41.9 27.97 6.36 (0.72) 36.6 36.20 6.27 (0.71) 52.6 46.25 5.83 (0.66) 48.6 55.80 4.15 (0.47) 32.4 65.88 3.71 (0.42) 28.6 Comparative Example 16.1 28.65 (0.98) 68.9 26.35 1.94 (0.22) 13.9 35.7 27.68 (0.87) 70.0

[0406]

[0407] Referring to Table 2, it is confirmed that the shape stability of the crimp of the lyocell material of Examples 1 to 6 is included in the range of 20% to 60%, and the moisture content of the lyocell material of Comparative Examples 1 to 3 is confirmed to be less than 20% or more than 60%.

[0408]

[0409] Experiment 3

[0410] Filters for smoking articles were manufactured using the lyocell materials of Examples 1 to 6 and Comparative Examples 1 to 3. The filters for smoking articles were manufactured in the shape of rods.

[0411] For each lyocell material-containing smoking article filter, the maximum weight and maximum suction resistance of the lyocell material were measured. Weight refers to the weight of the lyocell material used in the manufacture of one smoking article filter. Suction resistance refers to the pressure difference measured at both ends of the smoking article filter when 17.5 ml / sec of air is passed through the smoking article filter at room temperature conditions of 22±2℃.

[0412] Additionally, the number of filters for smoking articles manufactured per minute (production volume per minute) using the lyocell materials of Examples 1 to 6 and Comparative Examples 1 to 3 was calculated.

[0413] With respect to each filter for smoking articles manufactured using the lyocell material of Examples 1 to 6 and Comparative Examples 1 to 3, the maximum weight, maximum suction resistance, and production per minute of each filter for smoking articles are as shown in Table 3 below.

[0414]

[0415] Maximum weight (g / filter) Maximum suction resistance (mmWG / filter) Production per minute (filters / min) Example 19287863,00029217563,00038636833,00048757123,00058266983,00068326523,000 Comparative example 175355250026515235003732562500

[0416]

[0417] Referring to Table 3, it is confirmed that the filters for smoking articles comprising the lyocell materials of Examples 1 to 6 provide increased maximum weight and maximum suction resistance compared to the filters for smoking articles comprising the lyocell materials of Comparative Examples 1 to 3. In addition, it is confirmed that the filters for smoking articles comprising the lyocell materials of Examples 1 to 6 can be manufactured at a higher speed compared to the filters for smoking articles comprising the lyocell materials of Comparative Examples 1 to 3.

Claims

1. Contains crimped lyocell multifilament, Lyocell material with a crimp dimensional stability of 20% to 60%.

2. In paragraph 1, A lyocell material, wherein the tenacity of one or more monofilaments included in the above lyocell multifilament is 0.3 g / de to 0.8 g / de.

3. In paragraph 1, Lyocell material, wherein the number of crimps is 10 ea / inch to 50 ea / inch.

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

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

6. In paragraph 1, The shape stability of the above crimp is calculated by the following equation 1, Lyocell material: [Formula 1] Shape stability of crimp (%) = (L0-L b ) / (L0-L)·100 In Equation 1, L represents the length of the monofilament measured under the condition of initial load (0.01 cN / tex), L0 represents the length of the monofilament measured under the condition of 5 cN / tex load, and L b represents the length of the monofilament measured when the load of 5 cN / tex has been removed and then restored to its original state (0.01 cN / tex).

7. In paragraph 1, Lyocell material with a crimp dimensional stability of 25% to 55%.

8. In paragraph 1, Lyocell material with a moisture content of 200% to 350% of Lyocell multifilament.

9. In paragraph 8, The moisture content of the above lyocell material is a value measured according to the following equation 2: [Formula 2] 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. In paragraph 8, The above moisture content is a value measured from the lyocell multifilament before the crimp is applied, the lyocell material.

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

12. In paragraph 1, Lyocell material for smoking article filters.

13. A filter for a smoking article comprising a lyocell material according to any one of claims 1 to 12.

14. In paragraph 13, A filter for smoking articles, having a maximum weight per filter of lyocell material of 100 mg / filter to 1,000 mg / filter.

15. In paragraph 14, A filter for smoking articles having a maximum suction resistance per filter of 100 mmWG / filter to 900 mmWG / filter.

16. A smoking article comprising a filter for a smoking article according to Article 13.

17. A method for manufacturing a lyocell material, comprising: a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step; A method for manufacturing a lyocell material, wherein the moisture content of the above lyocell multifilament is controlled during the washing step, after the washing step, or between the washing steps.

18. In paragraph 17, A method for manufacturing a lyocell material, wherein the moisture content of the above lyocell multifilament is controlled to 200% to 350% before the crimping step.

19. In Article 17, A method for manufacturing a lyocell material, wherein the moisture content of the above lyocell multifilament is controlled by pressurization conditions.

20. In paragraph 17, A method for manufacturing a lyocell material, wherein the morphological stability of the crimp of the lyocell material measured after the above crimping step is 20% to 60%.

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