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

Abstract

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

Description

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

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

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

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

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

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

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

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

[0008] Specifically, a first lyocell multifilament; and a second lyocell multifilament, wherein the first lyocell multifilament comprises a first monofilament having a first cross-section, and the second lyocell multifilament comprises a second monofilament having a second cross-section, wherein the first cross-section and the second cross-section may be provided with different lyocell materials.

[0009] Additionally, a filter for a smoking article may be provided, comprising a first lyocell multifilament; and a second lyocell multifilament, wherein the first lyocell multifilament comprises a first monofilament having a first cross-section, and the second lyocell multifilament comprises a second monofilament having a second cross-section, wherein the first cross-section and the second cross-section comprise different lyocell materials.

[0010] According to another specific example of the present application, a smoking article comprising the lyocell material or filter may be provided.

[0011] According to another specific example of the present application, a method for producing the above lyocell material can be provided.

[0012]

[0013] 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.

[0014] Unless otherwise specifically defined herein, if the characteristics of lyocell materials, filters for smoking articles, and related components or compositions thereof are affected by temperature, the temperature at which the characteristics are confirmed 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, specifically 15 to 35°C, 20 to 30°C, or about 25°C.

[0015] In this specification, the term "different" may mean qualitatively different from each other. For example, "A and B are different" may mean that the amount of A and the amount of B are the same, but A and B are qualitatively distinct, or that A and B are quantitatively different and also qualitatively distinct. The term "qualitative" may mean non-quantitative characteristics. For example, differences in color, shape, texture, structure, and composition may fall under "qualitative" differences.

[0016] 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.

[0017] 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.

[0018]

[0019]

[0020] Hereinafter, the present invention will be described in more detail.

[0021] 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.

[0022] According to one aspect, a first lyocell multifilament is provided, and a second lyocell multifilament is provided, wherein the first lyocell multifilament comprises a first monofilament having a first cross-section, and the second lyocell multifilament comprises a second monofilament having a second cross-section, wherein the first cross-section and the second cross-section are different lyocell materials.

[0023] In some embodiments, one or more of the first lyocell multifilament and the second lyocell multifilament may be crimped.

[0024] In some embodiments, the first lyocell multifilament and the second lyocell multifilament may each be crimped.

[0025] In some embodiments, the first lyocell multifilament and the second lyocell multifilament can have from 10 to 50 crimps per inch independently of each other.

[0026] In some embodiments, at least one of the first cross-section and the second cross-section may be a heterogeneous cross-section.

[0027] In some embodiments, the first cross-section may be a first heterogeneous cross-section and the second cross-section may be a second heterogeneous cross-section.

[0028] In some embodiments, the first heterogeneous cross-section may include three protrusions, and the second heterogeneous cross-section may include multiple protrusions. For example, the second heterogeneous cross-section may include two protrusions, four protrusions, or five protrusions.

[0029] In some embodiments, at least one of the first cross-section and the second cross-section may not be a heterogeneous cross-section. For example, at least one of the first cross-section and the second cross-section may be a circular cross-section.

[0030] In some embodiments, the first cross-section may be a circular cross-section and the second cross-section may be a polygonal cross-section. Alternatively, the first cross-section may be a polygonal cross-section and the second cross-section may be a circular cross-section.

[0031] In some embodiments, the space occupancy of the first monofilament may be between 100% and 120%, and the space occupancy of the second monofilament may be between 120% and 600%.

[0032] In some embodiments, the polynomial of the first monofilament may be between 1.0 and 1.2, and the polynomial of the second monofilament may be between 1.2 and 10.

[0033] In some embodiments, the first lyocell multifilament and the second lyocell multifilament may be blended. For example, the first lyocell multifilament and the second lyocell multifilament may be braided, woven, non-woven, arranged, or co-spinning.

[0034] In some embodiments, the first lyocell multifilament and the second lyocell multifilament may be co-spinning.

[0035] In some embodiments, the first lyocell multifilament and the second lyocell multifilament may be bonded by a binder, wherein the binder may include one or more of a polyester-based binder, a cellulose-based binder, and a vinyl-based binder.

[0036] Exemplary lyocell materials may have a total fineness of 15,000 to 55,000 denier.

[0037] In some embodiments, for a total of 100 parts by weight of the first lyocell multifilament and the second lyocell multifilament, the first lyocell multifilament may be included in an amount of 1 to 99 parts by weight.

[0038] In some embodiments, the second lyocell multifilament may be included in an amount of 1 to 99 parts by weight for a total of 100 parts by weight of the first lyocell multifilament and the second lyocell multifilament.

[0039] In some embodiments, for every 100 parts by weight of the first lyocell multifilament, the second lyocell multifilament may be included in an amount of from 1 part by weight to 10,000 parts by weight.

[0040] An exemplary lyocell material may be lyocell tow.

[0041] An example lyocell material may be for a smoking article filter.

[0042] According to one aspect, a filter for a smoking article is provided comprising any one of the exemplary lyocell materials.

[0043] According to one aspect, a smoking article is provided comprising any one of the exemplary lyocell materials.

[0044] According to one aspect, a smoking article is provided comprising any one of the exemplary smoking article filters.

[0045] According to one aspect, a method for producing a lyocell material is provided, comprising a lyocell dope spinning step; and a coagulation and multifilament obtaining step.

[0046] An exemplary method for manufacturing a lyocell material includes a lyocell dope spinning step comprising a step of spinning a first lyocell multifilament comprising a first monofilament and a step of spinning a second lyocell multifilament comprising a second monofilament, wherein a first cross-section of the first monofilament and a second cross-section of the second monofilament are different.

[0047] In an exemplary method for manufacturing a lyocell material, the first lyocell multifilament and the second lyocell multifilament may be spun using the same lyocell dope or may be spun using different lyocell dopes.

[0048] In an exemplary method for manufacturing a lyocell material, the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament may be performed sequentially or simultaneously.

[0049] In an exemplary method for manufacturing a lyocell material, the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament may be performed through the same spinneret or through different spinnerets.

[0050] In an exemplary method for manufacturing a lyocell material, the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament can be performed simultaneously through the same spinneret.

[0051] In an exemplary method for manufacturing a lyocell material, the step of spinning a first lyocell multifilament and the step of spinning a second lyocell multifilament are performed through the same spinneret, but the cross-sections of the outlet through which the first lyocell multifilament is injected (which may be referred to as a first outlet) and the outlet through which the second lyocell multifilament is injected (which may be referred to as a second outlet) may be different.

[0052] In an exemplary method for manufacturing a lyocell material, the step of spinning a first lyocell multifilament and the step of spinning a second lyocell multifilament are performed sequentially, and the first lyocell multifilament and the second lyocell multifilament can be coagulated and obtained in the same coagulation tank.

[0053]

[0054] A lyocell material according to an exemplary embodiment includes a first lyocell multifilament including a first monofilament and a second lyocell multifilament including a second monofilament, wherein a first cross-section of the first monofilament is different from a second cross-section of the second monofilament. Accordingly, the lyocell material according to an exemplary embodiment includes at least two types of monofilaments having different cross-sections.

[0055] As a result, the lyocell material according to the exemplary embodiment can evenly enjoy the properties of the first monofilament having the first cross-section and the properties of the second monofilament having the second cross-section.

[0056] Specifically, when the first cross-section is a circular cross-section and the second cross-section is a non-circular cross-section, the lyocell material according to the exemplary embodiment can simultaneously enjoy the improved mechanical properties of the first monofilament and the improved specific surface area of ​​the second monofilament. Therefore, even if the filter for a smoking article contains a relatively small amount of the lyocell material, a predetermined suction resistance can be implemented, and at the same time, the mechanical properties related to the filter (e.g., the strength of the lyocell material) and the uniformity thereof can be relatively improved. Thus, by containing the lyocell material according to the exemplary embodiment, a low-weight, high-strength filter for a smoking article can be manufactured.

[0057] In addition, by adjusting the shapes of the first cross-section and the second cross-section, the physical properties of the lyocell material including the first multifilament and the second multifilament can be more finely adjusted. For example, the physical properties of the lyocell material according to the exemplary embodiment (e.g., the specific surface area of ​​the lyocell material) can be more finely adjusted compared to the physical properties of a lyocell material including only one type of lyocell multifilament.

[0058]

[0059] [Irregular cross-section]

[0060] At least one of the first cross-section of the first monofilament and the second cross-section of the second monofilament included in the lyocell material of the present application may be 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.

[0061] 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".

[0062] 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.

[0063] 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.

[0064] The heterogeneous cross-section may have a shape including a plurality of protrusions, for example, three protrusions. Here, “protrusions” may mean distinct, extended segments or arms extending outward from the central portion or junction of the monofilament cross-section. The heterogeneous cross-section may be a Y-shaped cross-section. It may be understood that the plurality of protrusions are formed integrally with the imaginary second circle as the center, and their ends are in contact with the imaginary first circle.

[0065] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0066] <Mathematical Formula 1>

[0067] Lee Hyung-do = r1 / r2

[0068] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0069] 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.

[0070] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0071] <Mathematical Formula 2>

[0072] Space occupancy = (S1 / S2) Х 100(%)

[0073] 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.

[0074] Additionally, the space occupancy of the monofilament having a heterogeneous cross-section can be 120% to 600%.

[0075] More specifically, the space occupancy of the monofilament having a heterogeneous cross-section is 120% to 600%, 130% to 600%, 140% to 600%, 150% to 600%, 160% to 600%, 170% to 600%, 180% to 600%, 190% to 600%, 200% to 600%, 210% to 600%, 220% to 600%, 230% to 600%, 240% to 600%, 250% to 600%, 260% to 600%, 270% to 600%, 280% to 600%, 290% to 600%, 300% to 600%, 310% to 600%, 320% to 600%, 330% to 600%, 340% to 600%, 350% to 600%, 360% to 600%, 370% to 600%, 380% to 600%, 390% to 600%, 400% to 600%, 410% to 600%, 420% to 600%, 430% to 600%, 440% to 600%, 450% to 600%, 460% to 600%, 470% to 600%, 480% to 600%, 490% to 600%, 500% to 600%, 510% to 600%, 520% ​​to 600%, 530% to 600%, 540% to 600%, 550% to 600%, 560% to 600%, 570% to 600%, 580% to 600%, 590% to 600%, 120% to 550%, 130% to 550%, 140% to 550%, 150% to 550%, 160% to 550%, 170% to 550%, 180% to 550%, 190% to 550%, 200% to 550%, 210% to 550%, 220% to 550%, 230% to 550%, 240% to 550%, 250% to 550%, 260% to 550%, 270% to 550%, 280% to 550%, 290% to 550%, 300% to 550%, 310% to 550%,320% to 550%, 330% to 550%, 340% to 550%, 350% to 550%, 360% to 550%, 370% to 550%, 380% to 550%, 390% to 550%, 400% to 550%, 410% to 550%, 420% to 550%, 430% to 550%, 440% to 550%, 450% to 550%, 460% to 550%, 470% to 550%, 480% to 550%, 490% to 550%, 500% to 550%, 510% to 550%, 520% to 550%, 530% to 550%, 540% to 550%, 120% to 500%, 130% to 500%, 140% to 500%, 150% to 500%, 160% to 500%, 170% to 500%, 180% to 500%, 190% to 500%, 200% to 500%, 210% to 500%, 220% to 500%, 230% to 500%, 240% to 500%, 250% to 500%, 260% to 500%, 270% to 500%, 280% to 500%, 290% to 500%, 300% to 500%, 310% to 500%, 320% to 500%, 330% to 500%, 340% to 500%, 350% to 500%, 360% to 500%, 370% to 500%, 380% to 500%, 390% to 500%, 400% to 500%, 410% to 500%, 420% to 500%, 430% to 500%, 440% to 500%, 450% to 500%, 460% to 500%, 470% to 500%, 480% to 500%, 490% to 500%, 120% to 450%, 130% to 450%, 140% to 450%, 150% to 450%, 160% to 450%, 170% to 450%, 180% to 450%, 190% to 450%, 200% to 450%, 210% to 450%,220% to 450%, 230% to 450%, 240% to 450%, 250% to 450%, 260% to 450%, 270% to 450%, 280% to 450%, 290% to 450%, 300% to 450%, 310% to 450%, 320% to 450%, 330% to 450%, 340% to 450%, 350% to 450%, 360% to 450%, 370% to 450%, 380% to 450%, 390% to 450%, 400% to 450%, 410% to 450%, 420% to 450%, 430% to 450%, 440% to 450%, 120% to 400%, 130% to 400%, 140% to 400%, 150% to 400%, 160% to 400%, 170% to 400%, 180% to 400%, 190% to 400%, 200% to 400%, 210% to 400%, 220% to 400%, 230% to 400%, 240% to 400%, 250% to 400%, 260% to 400%, 270% to 400%, 280% to 400%, 290% to 400%, 300% to 400%, 310% to 400%, 320% to 400%, 330% to 400%, 340% to 400%, 350% to 400%, 360% to 400%, 370% to 400%, 380% to 400%, 390% to 400%, 120% to 350%, 130% to 350%, 140% to 350%, 150% to 350%, 160% to 350%, 170% to 350%, 180% to 350%, 190% to 350%, 200% to 350%, 210% to 350%, 220% to 350%, 230% to 350%, 240% to 350%, 250% to 350%, 260% to 350%, 270% to 350%, 280% to 350%, 290% to 350%, 300% to 350%, 310% to 350%,320% to 350%, 330% to 350%, 340% to 350%, 120% to 300%, 130% to 300%, 140% to 300%, 150% to 300%, 160% to 300%, 170% to 300%, 180% to 300%, 190% to 300%, 200% to 300%, 210% to 300%, 220% to 300%, 230% to 300%, 240% to 300%, 250% to 300%, 260% to 300%, 270% to 300%, 280% to 300%, 290% to 300%, 120% to 250%, 130% to 250%, 140% to 250%, 150% to 250%, 160% to 250%, 170% to 250%, 180% to 250%, 190% to 250%, 200% to 250%, 210% to 250%, 220% to 250%, 230% to 250%, 240% to 250%, 120% to 200%, 130% to 200%, 140% to 200%, 150% to 200%, 160% to 200%, 170% to 200%, 180% to 200%, 190% to 200%, 120% to 150%, 130% to 150%, or 140% to 150%.

[0076] In addition, when at least one of the first cross-section and the second cross-section is a heterogeneous cross-section, the specific surface area of ​​the lyocell material including the first lyocell multifilament and the second lyocell multifilament can be improved. As a result, the filtering performance of the filter for a smoking article including the lyocell material can be improved.

[0077] Meanwhile, at least one of the first monofilament and the second monofilament may have a cross-section that is not an anisotropic cross-section. At least one of the first cross-section and the second cross-section may not be an anisotropic cross-section. For example, the cross-section that is not an anisotropic cross-section may be a circular cross-section.

[0078] For example, the first cross-section of the first monofilament may be circular. When the first cross-section is circular, the first monofilament may provide improved mechanical properties compared to a monofilament having a non-circular cross-section. For example, a first monofilament having a circular first cross-section may provide more uniform mechanical properties.

[0079]

[0080] [Island]

[0081] The lyocell material of the present application can have a fineness suitable for manufacturing a filter for a smoking article and securing its function.

[0082] In one example, the single denier of the monofilament included in the lyocell multifilament may be 1.5 to 8.0 denier. In this case, the single denier of the filament refers to the fineness of one monofilament separated from the multifilament.

[0083] Additionally, the single fiber density of the first monofilament and the single fiber density of the second monofilament may be the same.

[0084] Specifically, the single fiber density of the filament may be, for example, 7.5 denier or less, 7.0 denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier or less, 4.5 denier or less, 3.5 denier or less, 3.0 denier or less, 2.5 denier or less, or 2.0 denier or less. And, the lower limit may be, for example, 2.0 denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier or more, 4.5 denier or more, 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier or more, or 7.0 denier or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., hardness or suction resistance implementation) and fairness of a filter for smoking articles.

[0085] In one example, the total fineness of the lyocell material may be 15,000 to 55,000 denier, and the total fineness of the lyocell material may be calculated as the sum of the total fineness of the first lyocell multifilament and the total fineness of the second lyocell multifilament.For example, the lower limit of the total fineness is, for example, 16,000 or more, 16,500 or more, 17,000 or more, 17,500 or more, 18,000 or more, 18,500 or more, 19,000 or more, 19,500 or more, 20,000 or more, 20,500 or more, 21,000 or more, 21,500 or more, 22,000 or more, 22,500 or more, 23,000 or more, 23,500 or more, 24,000 or more, 24,500 or more, 25,000 or more, 25,500 or more, 26,000 or more, 26,500 or more, 27,000 or more, 27,500 or more, 28,000 or more, 28,500 or more, 29,000 or more, 29,500 or more, 30,000 or more, 30,500 or more, 31,000 or more, 31,500 or more, 32,000 or more, 32,500 or more, 33,000 or more, 33,500 or more, 34,000 or more, 34,500 or more, 35,000 or more, 35,500 or more, 36,000 or more, 36,500 or more, 37,000 or more, 37,500 or more, 38,000 or more 38,500 or more, 39,000 or more, 39,500 or more, 40,000 or more 40,500 or more, 41,000 or more, 41,500 or more, 42,000 or more, 42,500 or more, 43,000 or more, 43,500 or more, 44,000 or more, 44,500 or more, 45,000 or more, 45,500 or more, 46,000 or more, 46,500 or more, 47,000 or more, 47,500 or more, 48,000 or more, 48,500 or more, 49,000 or more, 49,500 or more, 50,000 or more, 50,500 or more, 51,000 or more, 51,500 or more, 52,000 or more, 52,500 or more, 53,000 or more, 53,500 or more, 54,000 or 54,500 or more.And, the upper limit is, for example, 54,500 or less, 54,000 or less, 53,500 or less, 53,000 or less, 52,500 or less, 52,000 or less, 51,500 or less, 51,000 or less, 50,500 or less, 50,000 or less, 49,500 or less, 49,000 or less, 48,500 or less, 48,000 or less, 47,500 or less, 47,000 or less, 46,500 or less, 46,000 or less, 45,500 or less, 45,000 or less, 44,500 or less, 44,000 or less, 43,500 or less, 43,000 or less, 42,500 or less, 42,000 or less, 41,500 or less, 41,000 or less, 40,500 or less, 40,000 or less, 39,500 or less, 39,000 or less, 38,500 or less, 38,000 or less, 37,500 or less, 37,000 or less, 36,500 or less, 36,000 or less, 35,500 or less, 35,000 or less, 34,500 or less, 34,000 or less, 33,500 or less, 33,000 or less, 32,500 or less, 32,000 or less, 31,500 or less, 31,000 or less, 30,500 or less, 30,000 or less, 29,500 or less, 29,000 or less, 28,500 or less, It can be 28,000 or less, 27,500 or less, 27,000 or less, 26,500 or less, 26,000 or less, 25,500 or less, 25,000 or less, 24,500 or less, 24,000 or less, 23,500 or less, 23,000 or less, 22,500 or less, 22,000 or less, 21,500 or less, 21,000 or less, 20,500 or less, 20,000 or less, 19,500 or less, 19,000 or less, 18,500 or less, 18,000 or less, 17,500 or less, 17,000 or less, 16,500 or less, 16,000 or less, or 15,500 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).

[0086] 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. Fix one end of the stabilized lyocell tow, and attach a weight with a load of 2 kg to the other end. After maintaining the tow in a state of being extended by the load (stabilization) for 5 seconds, cut it into 90 cm to obtain a sample, and measure the weight of the sample (total fineness). The fineness is converted into the measured weight Х 10000 according to the denier conversion method. The single fineness of the monofilament in the sample is calculated by dividing the total fineness of the sample by the number of monofilaments in the sample.

[0087] Additionally, the total fineness of the lyocell material can be determined by the single fineness and crimp count of the monofilament. In the present application, the single fineness and crimp count can be controlled, and the total fineness of the lyocell material (e.g., lyocell tow) suitable for manufacturing a filter for a smoking article and ensuring its function can be secured.

[0088]

[0089] [Number of crimps]

[0090] In one example, the first lyocell multifilament and the second lyocell multifilament can independently have 10 to 50 crimps per inch. For example, the number of crimps can be 15 ea / inch or more, 20 ea / inch or more, 25 ea / inch or more, 30 ea / inch or more, 35 ea / inch or more, 40 ea / inch or more, or 45 ea / inch or more, and the upper limit can be, for example, 45 ea / inch or less, 40 ea / inch or less, 35 ea / inch or less, 30 ea / inch or less, or 25 ea / inch or less. The number of crimps and their uniformity can be controlled through pressure and temperature conditions, etc., regarding the crimping step described below.

[0091] Although not particularly limited, the number of crimps can be measured using, for example, a single fiber property evaluation device (Favimat). Specifically, 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 0.05 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%).

[0092] 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.

[0093]

[0094] [bookbinder]

[0095] In one non-limiting example, the lyocell material may further include a binder. Furthermore, by including the binder, the first lyocell multifilament and / or the second lyocell multifilament may be bonded.

[0096] The binder may be present, for example, on the surface of the first lyocell multifilament and / or the second lyocell multifilament, or between the first lyocell multifilament (or monofilament) and / or the second lyocell multifilament. 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 smoking article (e.g., cigarette) manufacturing process.

[0097] 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.

[0098] In one non-limiting example, the binder may include a polyester-based binder, a cellulosic-based binder, and / or a vinyl-based binder.

[0099] 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.

[0100] 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.

[0101] 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).

[0102] The method of applying (coating) the above binder to the lyocell material is described below.

[0103]

[0104] [emulsion]

[0105] The lyocell material may include first lyocell multifilaments; second lyocell multifilaments; and an emulsion coated on at least one of the first lyocell multifilaments and the second lyocell multifilaments. In some embodiments, the emulsion is coated on the first lyocell multifilaments and the second lyocell multifilaments. The emulsion includes (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol; and (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms. The emulsion may be applied to some or all of the monofilaments or multifilaments forming the lyocell material. In addition, the emulsion may penetrate between the filaments.

[0106] 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.

[0107] In a specific example of the present application, the lyocell material may contain a predetermined amount of the emulsion. In this case, the amount of the emulsion 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. Specifically, 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, specifically 3.5 wt% or more, 4.0 wt% or more, 4.2 wt% or more, 4.5 wt% or more, 5.0 wt% or more, 5.5 wt% or more, 6.0 wt% or more, 6.5 wt% or more, 7.0 wt% or more, 7.5 wt% or more, 8.0 wt% or more, 8.5 wt% or more, 9.0 wt% or more, or 9.5 wt% or more. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less.

[0108] 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., 10 kgf / cm) is applied to the sample using a syringe-shaped container. 2 Below 5 kgf / cm 2 Less than or equal to 2-4 kgf / cm 2 ) and press the sample once. This sufficiently squeezes out 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.

[0109] Food

[0110] Content of emulsion by extrusion (OPU, % or wt%)

[0111] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0112] In addition, the lyocell material that serves as the basis for the above-described emulsion content may be a first lyocell multifilament treated with an emulsion and a second lyocell multifilament treated with an emulsion. For example, the lyocell material may be a first lyocell multifilament and / or a second lyocell multifilament to which a first emulsion treatment (which will be described below) has been applied, a first lyocell multifilament and / or a second lyocell multifilament to which a first emulsion treatment and a second emulsion treatment (which will be described below) have been applied, or a first lyocell multifilament and / or a second lyocell multifilament treated with a binder, which will be described below, along with the above-described emulsion treatment. In addition, the first lyocell multifilament and / or the second lyocell multifilament treated with an emulsion and / or a binder may each be provided with crimp.

[0113] 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.

[0114] With respect to the above component (a), the type of fatty acid having 16 or more carbon atoms forming 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.

[0115] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0116] 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.

[0117] 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 available saturated fatty acids are not limited to these.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and it can have a linear or branched form.

[0122] In one example, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. Specifically, 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.

[0123] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0124] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol and stearyl alcohol.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0131] 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.

[0132] 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.

[0133] 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 available saturated fatty acids are not limited to these.

[0134] 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.

[0135] In a specific example of the present application, the component (b) may be an ester of sorbitan and oleic acid (e.g., sorbitan monooleate). However, the types of usable component (b) are not limited thereto.

[0136] (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.

[0137] 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.

[0138] Specifically, 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.

[0139] In one example, the emulsion may include 40 to 80 wt% of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, based on 100 wt% of the total weight of the emulsion. Specifically, the content of the (a) component 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 weight of the emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0140] In one example, the emulsion may contain an excess of component (a).

[0141] 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 weight of the emulsion. Specifically, the content of the (b) component may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, based on 100 wt% of the total weight of the emulsion. And the upper limit of the content may be, for example, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, or 25 wt% or less.

[0142] In one example, the emulsion may further contain water. A small amount of water may aid in emulsification.

[0143] 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.

[0144] In some embodiments, the first lyocell multifilament is a crimped first lyocell multifilament and / or a crimped and emulsified first lyocell multifilament.

[0145] In some embodiments, the second lyocell multifilament is a crimped second lyocell multifilament and / or a crimped and emulsified second lyocell multifilament.

[0146]

[0147] [Method for manufacturing lyocell material]

[0148] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0149] Specifically, the method for manufacturing the lyocell material includes a lyocell dope spinning step; a coagulation and multifilament obtaining step; a washing step; an emulsion treatment step; and a crimping step. In addition, the method for manufacturing the lyocell material may further include a binder treatment step; and other steps.

[0150] The emulsion treatment step may be performed before the crimping step, after the crimping step, or before and after the crimping step.

[0151] 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.

[0152] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0153] A method for manufacturing a lyocell material according to a specific embodiment of the present application, including a milk treatment step and a crimping step, is described in more detail below. The method of the present application may be performed by including one or more of the steps described below.

[0154]

[0155] <(a) Lyocell dope radiation stage>

[0156] This step is a step of spinning lyocell dope (or spinning dope) containing lyocell cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0157] Additionally, the lyocell dope spinning step includes a step of spinning a first lyocell multifilament and a step of spinning a second lyocell multifilament. Matters relating to the first monofilament of the first lyocell multifilament and the second monofilament of the second lyocell multifilament are as described above.

[0158] In an exemplary method for manufacturing a lyocell material, the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament may be performed sequentially or simultaneously.

[0159] 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.

[0160] In an exemplary method for manufacturing a lyocell material, the first lyocell multifilament and the second lyocell multifilament may be spun using the same lyocell dope. As a result, the chemical properties of the first lyocell multifilament and the second lyocell multifilament may be identical or extremely identical.

[0161] Additionally, the first lyocell multifilament and the second lyocell multifilament can be spun using different lyocell dopes. As a result, the physical properties of the first lyocell multifilament and the second lyocell multifilament can be varied, and the physical properties of the lyocell material can be finely adjusted.

[0162] In one example, the content of cellulose in the spinning dope may be 5 to 15 wt% based on 100 wt% of the total weight of the dope. If the content of cellulose is too low, it is difficult to implement the characteristics 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, 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. The term "cellulose" may refer to "lyocell cellulose".

[0163] 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.

[0164] 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.

[0165] Additionally, in specific examples 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 hemicellulose within the cellulose pulp.

[0166] 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.

[0167] In an exemplary method for manufacturing a lyocell material, the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament may be performed through the same spinneret or through different spinnerets.

[0168] In addition, when the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament are performed simultaneously through the same spinning device, the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament can be performed simultaneously. As a result, the conditions for coagulating and obtaining the first lyocell multifilament and the second lyocell multifilament can be applied identically, and changes in the lyocell multifilament according to the coagulation and obtaining steps can be controlled at the same level.

[0169] The nozzle temperature of the spinneret, specifically 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.

[0170] In one example, the step of spinning the above-described spinning dope may be performed under controlled spinning conditions so that the single denier of the filament can be from 1.5 denier 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 denier of the filament included in the lyocell material can satisfy 1.5 to 8.0 denier. In this case, the single denier of the filament refers to the single denier of a single monofilament separated from a multifilament.

[0171] Specifically, the single denier of the filament may be, for example, 7.5 denier or less, 7.0 denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier or less, 4.5 denier or less, 3.5 denier or less, 3.0 denier or less, 2.5 denier or less, or 2.0 denier or less. And, the lower limit may be, for example, 2.0 denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier or more, 4.5 denier or more, 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier or more, or 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 a smoking article.

[0172] In an exemplary method for manufacturing a lyocell material, the step of spinning a first lyocell multifilament and the step of spinning a second lyocell multifilament are performed through the same spinneret, but the cross-sections of the spinneret through which the first lyocell multifilament is injected and the spinneret through which the second lyocell multifilament is injected may be different.

[0173] For example, the cross-section of the discharge port through which the first lyocell multifilament is injected may be circular, and the cross-section of the discharge port through which the second lyocell multifilament is injected may be irregular.

[0174] The radiation dope discharged through the radiation detention can go through the coagulation step described below.

[0175]

[0176] <(b) Coagulation and multifilament production step>

[0177] In this step, the radiated lyocell radiant dope is coagulated, and lyocell multifilament can be obtained.

[0178] 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.

[0179] In one example, the solidification may include a first solidification step of supplying cooling air to the radiated lyocell dope; and a second solidification step of introducing the first-solidified radiated dope into a solidification solution to solidify it.

[0180] According to the above-described solidification method, the lyocell dope discharged from the spinneret can be primarily solidified in the space (air gap section) between the spinneret and the solidification tank. For example, cooling air can be supplied from the inside of the spinneret to the outside of the spinneret from an air-cooling unit located inside the spinneret to the inside of the spinneret. Alternatively, primary solidification can be achieved by a so-called air quenching method or method known in the relevant field.

[0181] In one example, the upper temperature limit of the cooling air used for primary solidification may be, for example, 15°C or lower. Specifically, 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 is not sufficient, and the radiation-related processability is poor.

[0182] 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.

[0183] 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 3 / h can be supplied to the radiation dope derived from the air volume. More specifically, the air volume is 100 Nm 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or more or 250 Nm 3 / h or more, and the upper limit of the airflow is, for example, 350 Nm 3 / h or less, 300 Nm 3 / h or less, 250 Nm 3 / h or less, 200 Nm 3 / h or less or 150 Nm 3 / h can be less than or equal to.

[0184] After the primary coagulation as described above, the cooled spinning dope can be supplied to a coagulation tank or bath containing a coagulating solution (secondary coagulation). For proper coagulation, 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. Maintaining the temperature above allows for an appropriate coagulation rate to be maintained.

[0185] 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).

[0186] 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 weight of the 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 weight of the coagulant. The concentration of the coagulant may be controlled to be maintained during the manufacturing process using a sensor or the like.

[0187] In an exemplary method for manufacturing a lyocell material, the step of spinning a first lyocell multifilament and the step of spinning a second lyocell multifilament are performed sequentially, and the first lyocell multifilament and the second lyocell multifilament can be coagulated and obtained in the same coagulation tank.

[0188]

[0189] <(c) Washing stage>

[0190] If necessary, each lyocell multifilament may be washed after the above-described coagulation and multifilament harvesting steps. This washing may remove any remaining NMMO and / or other impurities within the filament.

[0191] The method of washing is not particularly limited. For example, washing can be accomplished by introducing each coagulated lyocell multifilament into a washing tank using a traction roller. Alternatively, washing can be accomplished by spraying the washing solution onto the lyocell multifilament as it moves to the next stage via a traction roller.

[0192] The components of the washing liquid are not particularly limited. For example, the washing liquid may contain water and may also contain known additives.

[0193] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0194]

[0195] <(d) Milk processing stage>

[0196] If necessary, each lyocell multifilament may be subjected to an emulsion treatment step. 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 during 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.

[0197] Although not particularly limited, the emulsion treatment may be carried out by immersing each lyocell multifilament in a bath filled with emulsion so that each lyocell multifilament is 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.

[0198] After the emulsion treatment as described above, in order to ensure that the amount of emulsion applied to each lyocell multifilament 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.

[0199] In one example, the emulsion treatment may be performed such 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 first lyocell multifilament and the second multifilament. In this case, the emulsion-treated first lyocell multifilament and / or the emulsion-treated second lyocell multifilament may be, for example, each lyocell multifilament to which the first emulsion treatment has been applied, each lyocell multifilament to which the first emulsion treatment and the second emulsion treatment (see the description below) have been applied, or each lyocell multifilament to which a binder, which will be described later, has been applied together with the emulsion treatment as described above. In addition, the first lyocell multifilament and / or the second lyocell multifilament to which the emulsion and / or binder treatment has been applied as described above may be crimped.

[0200] Specifically, the content of the emulsion in at least the first lyocell multifilament and the second lyocell multifilament treated with 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, specifically 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 weight of the first lyocell multifilament and / or the second lyocell multifilament treated with the emulsion. 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 7.6 wt% or less. In this case, the content may mean the dry weight after evaporation of a solvent (e.g., water) or a liquid component that may be included in the emulsion.

[0201] 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.

[0202] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0203] In a specific example of the present application, one or more of the steps described above may be controlled so that the single denier of the filaments forming the lyocell multifilament can be from 1.5 to 8.0 denier. The single denier of the filaments refers to the fineness of one single monofilament separated from the multifilament.

[0204] Specifically, the single denier of the filament may be, for example, 7.5 denier or less, 7.0 denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier or less, 4.5 denier or less, 3.5 denier or less, 3.0 denier or less, 2.5 denier or less, or 2.0 denier or less. And, the lower limit may be, for example, 2.0 denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier or more, 4.5 denier or more, 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier or more, or 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 a smoking article.

[0205] 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.

[0206]

[0207] <(e) Crimp application step>

[0208] The crimping step is a step in which pressure is applied to the emulsion-treated first lyocell multifilament and / or the second lyocell multifilament by 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.

[0209] Crimping imparts waves to each lyocell multifilament, giving the fibers bulky characteristics. 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 impart one or more of the pressures described below.

[0210] In one example, the crimping step may be performed by first supplying steam to each lyocell multifilament to preheat and swell each lyocell multifilament, and then pressing each lyocell multifilament with a press roller to form wrinkles in the lyocell multifilament. In this case, a steam box may be used for supplying steam, and the steam box may be located upstream of the crimping device.

[0211] 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.

[0212] In one example, the crimping step may be performed by first supplying steam to each lyocell multifilament to preheat and swell each lyocell multifilament, and then simultaneously applying pressure and steam to each lyocell multifilament by a press roller.

[0213] In one example, the crimping step applies 0.1 to 2.0 kgf / cm to each lyocell multifilament before feeding it into the crimping device (specifically, the press roller). 2 It can be performed while applying steam.

[0214] For example, 0.2 kgf / cm 2 Above, 0.3 kgf / cm 2 Above, 0.4 kgf / cm 2 Above, 0.5 kgf / cm 2 or more than 0.6 kgf / cm 2 The above steam can be provided by a steam box. Also, 1.5 kgf / cm 2 Below, 1.4 kgf / cm 2 Below, 1.3 kgf / cm 2 Below, 1.2 kgf / cm 2 Below, 1.1 kgf / cm 2 Less than or equal to 1.0 kgf / cm 2 The following steam may be provided. If the steam supply or pressure falls below the above-mentioned range, the crimp may not form smoothly. Furthermore, if it exceeds the above-mentioned range, the flexibility of the filament may increase, resulting in excessive crimping within the crimping device, preventing the filament from passing through the crimping device.

[0215] In one example, the crimping step may be performed by pressing each lyocell multifilament with a press roller to form crimps in each lyocell multifilament. Furthermore, steam may not be supplied prior to pressurization, steam may not be supplied simultaneously with pressurization, or steam may not be supplied both prior to pressurization and simultaneously with pressurization.

[0216] In one example, the crimping step applies a pressure of 1.5 to 4.0 kgf / cm to each lyocell multifilament fed into the crimping device independently using a press roller. 2 can be performed while applying pressure.

[0217] For example, 1.6 kgf / cm 2 Above, 1.7 kgf / cm 2 Above, 1.8 kgf / cm 2 Above, 1.9 kgf / cm 2 Above, 2.0 kgf / cm 2 Above, 2.1 kgf / cm 2 Above, 2.2 kgf / cm 2 Above, 2.3 kgf / cm 2 Above, 2.4 kgf / cm 2 or more than 2.5 kgf / cm 2 The above pressure can be applied to the lyocell multifilament through the press roller. Also, 3.9 kgf / cm 2 Below, 3.8 kgf / cm 2 Below, 3.7 kgf / cm 2 Below, 3.6 kgf / cm 2 Below 3.5 kgf / cm 2 Below, 3.4 kgf / cm 2 Below, 3.3 kgf / cm 2 Below, 3.2 kgf / cm 2 Below, 3.1 kgf / cm 2 Below 3.0 kgf / cm 2 Below, 2.9 kgf / cm 2 Below, 2.8 kgf / cm 2 Below, 2.7 kgf / cm 2 Below, 2.6 kgf / cm 2 Less than or equal to 2.5 kgf / cm 2 The following pressures can be applied by the press roller:

[0218] 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 passing through the stuffer box. Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0219] In one example, a pressure of 0.1 to 2 kgf / cm is applied to each lyocell multifilament using the top plate. 2 The pressure of the upper plate can be applied independently of each other. In addition, the upper plate can apply pressure to each lyocell multifilament as it passes through or is passing through the press roller.

[0220] For example, the pressure applied by the upper plate is 0.2 kgf / cm 2 Above, 0.3 kgf / cm 2 Above, 0.4 kgf / cm 2 or more than 0.5 kgf / cm 2 It may be more than 1.5 kgf / cm 2 Below, 1.4 kgf / cm 2 Below, 1.3 kgf / cm 2 Below, 1.2 kgf / cm 2 Below, 1.1 kgf / cm 2 Less than or equal to 1.0 kgf / cm 2 The following pressures can be applied by the upper plate:

[0221] Furthermore, if the pressure of the upper plate, which moves up and down to provide uniform crimp after passing through the press roller, is less than 0.1 kgf / ㎠, the upper plate cannot be fixed due to the pressure inside the stopper box, so the tow remains inside the stopper box for a long time, preventing the continuity of the process from being maintained. If it exceeds 2 kgf / ㎠, the steam cannot be smoothly discharged inside the stopper box, which may result in an irregular crimp shape.

[0222] In one example, the crimping step may employ a doctor blade that applies a predetermined pressure to each lyocell multifilament. The doctor blade controls the residence time of the filaments fed into the crimper stuffer box, thereby contributing to the control of the number of crimps. Such a doctor blade may be positioned, for example, in the path of each lyocell multifilament as it is pressed by the roller described above and then discharged from the roller pressure point.

[0223] In one example, the crimping step applies a crimping force of 0.1 to 2.0 kgf / cm to each lyocell multifilament independently through the roller of the crimping device using a doctor blade. 2 can be performed while applying pressure.

[0224] For example, the pressure applied by the doctor blade is 0.2 kgf / cm 2 Above, 0.3 kgf / cm 2 Above, 0.4 kgf / cm 2 or more than 0.5 kgf / cm 2 It may be more than 1.5 kgf / cm 2 Below, 1.4 kgf / cm 2 Below, 1.3 kgf / cm 2 Below, 1.2 kgf / cm 2 Below, 1.1 kgf / cm 2 Less than or equal to 1.0 kgf / cm 2 The following pressures can be applied by the doctor blade:

[0225] 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 is not good, and if the temperature is too high, the concentration of the oil content in the stuffer box 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.

[0226]

[0227] <(f) Binder processing step>

[0228] In one example, the method may further comprise a step of treating the first lyocell multifilament and / or the second lyocell multifilament obtained by the emulsion-treated step or the first lyocell multifilament and / or the second lyocell multifilament obtained by the crimping step with a binder.

[0229] 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.

[0230] The method for coating the binder on the lyocell material is not particularly limited. For example, the emulsion treatment may be performed by immersing the first lyocell multifilament and / or the second lyocell multifilament in a bath filled with binder (or binder solution) so that the first lyocell multifilament and / or the second lyocell multifilament are completely immersed in the binder. Alternatively, the binder coating may be performed by spraying (or spraying) the binder (or binder solution) using a nozzle.

[0231] The types and components of available binders are as described above, so they are omitted.

[0232] 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).

[0233] 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 a total of 100 wt% of the first lyocell multifilament and the second multifilament treated with the emulsion and binder. 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.

[0234] After the binder is coated on the first lyocell multifilament and / or the second lyocell multifilament, drying of the binder may be performed. The drying temperature is not particularly limited, but, for example, drying may be performed at room temperature (approximately 10 to 35°C).

[0235]

[0236] <(g) Other steps>

[0237] After crimping, additional appropriate post-processing may be performed.

[0238] 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.

[0239] Specifically, secondary emulsion treatment can be performed by applying emulsion to lyocell material (e.g., lyocell tow) that has undergone a crimper process. This can be advantageous in various processes performed during the manufacturing of filters for smoking articles. For example, secondary emulsion treatment can not only ensure that the fibers and filter are easily spreadable in air during the spreading process, but also limit fiber breakage during the drawing process.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] In one aspect, the present invention provides a lyocell material obtained by the method for producing a lyocell material as described above.

[0244] In one aspect, the present invention provides a lyocell material obtainable by the method for producing a lyocell material as described above.

[0245]

[0246] [Smoking items]

[0247] 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.

[0248] For example, the lyocell material may be incorporated into a combustible cigarette. As another example, the lyocell material may be incorporated into a heated cigarette, and the heated cigarette may be used in conjunction with an aerosol generating device (not shown).

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255]

[0256] [Filter for smoking items]

[0257] Lyocell material can be used in a filter for a smoking article. The lyocell material may be lyocell tow. In one example, the lyocell tow comprises a first crimped lyocell multifilament and a second crimped lyocell multifilament.

[0258] 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. Preferably, the lyocell material may be lyocell tow. In addition, the filter for the smoking article comprises lyocell tow, which may be the same as described above.

[0259] In addition, the lyocell material includes the emulsion in an amount of 0.1 wt% or more relative to 100 wt% of the total lyocell material. In addition, the description of the emulsion components and content according to the specific example of the present application is the same as described above.

[0260] In one example, the single denier of the filaments forming the lyocell multifilament may be 1.5 to 8.0 denier. Additionally, the single denier of the first monofilament and the single denier of the second monofilament may be the same. The specific values ​​are the same as those described above.

[0261] In one example, the total fineness of the lyocell material may be 15,000 to 55,000 denier, preferably lyocell tow. The specific values ​​are the same as described above.

[0262] In one example, the first Lyocell multifilament and / or the second Lyocell multifilament imparted with crimps may independently have from 10 to 50 crimps per inch. The specific numbers are the same as described above.

[0263] In one example, the filter for a smoking article may further include a binder on the surface of the first lyocell multifilament and / or the second lyocell multifilament to which the crimping is applied or between the first lyocell multifilament and / or the second lyocell multifilament to which the crimping is applied. The binder increases the hardness of the filter for a smoking article made of a lyocell material (e.g., lyocell tow) to prevent problems such as the filter being stuck during the filter manufacturing process or the cigarette manufacturing process. The description of the type, components, and contents of the binder that can be used is the same as described above.

[0264] 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).

[0265] In a specific example of the present application, the filter for the smoking article may have a predetermined shape and size.

[0266] For example, the filter may have a rod shape. More specifically, the filter for the smoking article may have a cylindrical shape.

[0267] 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.

[0268] In a specific example of the present application, the filter having the above length may have a circular cross-section, and the circumference of the circular cross-section may be 10 to 40 mm. For example, the lower limit of the circumference of the filter may be 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, or 35 mm or more, and the upper limit may be 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0269] 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.

[0270] 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).

[0271] In one example, when a porous paper is used, the paper may have a porosity of 10 to 50,000 Coresta Units (CU). 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. Specifically, the lower limit of the porosity of the above-mentioned paper may be, for example, 1000 CU or more, 5000 CU or more, 10000 CU or more, 15000 CU or more, 20000 CU or more, 25000 CU or more, 30000 CU or more, 35000 CU or more, 40000 CU or more, or 45000 CU or more, and the upper limit may be, for example, 45000 CU or less, 40000 CU or less, 35000 CU or less, 30000 CU or less, 25000 CU or less, or 20000 CU or less. In a specific example of the present application, the paper may have a porosity within a range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0272] In one example, the weight of the above paper is 15 to 60 g / cm 2　 It can be. Specifically, 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 / cm2 Below 50 g / cm 2 Below 45 g / cm 2 Below 40 g / cm 2 Below 35 g / cm 2 Below 30 g / cm 2 Below 25 g / cm 2 Less than or equal to 20 g / cm 2 It may be less than or equal to 16 g / cm. In a specific example of the present application, the paper has a thickness of 16 g / cm. 2 Above, 17 g / cm 2 Above, 18 g / cm 2 Above, 19 g / cm 2 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:

[0273] Although not particularly limited, the weight of the rod-shaped filter may be 50 mg or more. Specifically, 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.

[0274] Descriptions of other filters for smoking articles and materials included therein are the same as those described above, so they are omitted.

[0275]

[0276] [Method for manufacturing filters for smoking articles]

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] Preferably, the lyocell material used in the manufacture of filters for smoking articles may be lyocell tow.

[0282] 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.

[0283]

[0284] According to the present application, a lyocell material for a smoking article filter that can replace commercially available cellulose acetate (CA) and a filter for a smoking article comprising the same are provided. Specifically, a lyocell material is provided that can evenly enjoy the properties of a first monofilament having a first cross-section and the properties of a second monofilament having a second cross-section.

[0285]

[0286] 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.

[0287]

[0288] 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.

[0289]

[0290] [Manufacturing example]

[0291] Cellulose pulp having an alpha-cellulose content of 93.9% and a degree of polymerization (DPw) of 820 was mixed with an NMMO / H2O solvent having a propyl gallate content of 0.01 wt% to produce a spinning dope having a concentration of 11 wt%. Then, the spinning dope was spun while appropriately adjusting the discharge amount and spinning speed while maintaining the spinning temperature at 110°C in the spinneret.

[0292] The spinning dope on the filament ejected from the spinneret was supplied to the coagulation liquid (coagulation liquid having a concentration including 75 wt% of water and 25 wt% of NMMO and a temperature of about 25°C) in the coagulation tank through the air gap section. At this time, the cooling air in the air gap section was supplied at a temperature of 8°C and a pressure of 200 Nm 3The radiation dope was first coagulated at a flow rate of / h. In addition, the concentration of the coagulant was continuously monitored using a sensor and a refractometer.

[0293] Then, the coagulated lyocell filament 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.

[0294] The filament is fed to the nip roll installed in the bath discharge section at 2 kgf / cm. 2 It was processed under pressure and put into a crimp machine for wrinkle application. The pressure of the press roller was 2.5 kgf / cm 2 The pressure of the doctor blade is 0.5 kgf / cm 2 Lyocell tow was manufactured by setting it as .

[0295] The single denier of the manufactured tow was 1.5 to 4.5 denier, the total denier was 30,000 to 50,000 denier, and the crimp count was 15 to 50 ea / inch.

[0296]

[0297] Example 1

[0298] Lyocell tow was manufactured according to the above manufacturing example, wherein the spinneret included a first discharge port with a circular cross-section through which a first lyocell multifilament was injected, and a second discharge port with a non-circular cross-section through which a second lyocell multifilament was injected.

[0299] Additionally, the number of first and second discharge ports was appropriately adjusted so that the weight ratio of the first lyocell multifilament and the second lyocell multifilament included in the lyocell tow was 95 to 5.

[0300]

[0301] Example 2

[0302] Lyocell tow was manufactured according to the above manufacturing example, wherein the spinneret included a first discharge port with a circular cross-section through which a first lyocell multifilament was injected, and a second discharge port with a non-circular cross-section through which a second lyocell multifilament was injected.

[0303] Additionally, the number of first and second discharge ports was appropriately adjusted so that the weight ratio of the first lyocell multifilament and the second lyocell multifilament included in the lyocell tow was 75 to 25.

[0304]

[0305] Example 3

[0306] Lyocell tow was manufactured according to the above manufacturing example, wherein the spinneret included a first discharge port with a circular cross-section through which a first lyocell multifilament was injected, and a second discharge port with a non-circular cross-section through which a second lyocell multifilament was injected.

[0307] Additionally, the number of first and second discharge ports was appropriately adjusted so that the weight ratio of the first lyocell multifilament and the second lyocell multifilament included in the lyocell tow was 50 to 50.

[0308]

[0309] Example 4

[0310] Lyocell tow was manufactured according to the above manufacturing example, wherein the spinneret included a first discharge port with a circular cross-section through which a first lyocell multifilament was injected, and a second discharge port with a non-circular cross-section through which a second lyocell multifilament was injected.

[0311] Additionally, the number of first and second discharge ports was appropriately adjusted so that the weight ratio of the first lyocell multifilament and the second lyocell multifilament included in the lyocell tow was 25 to 75.

[0312]

[0313] Example 5

[0314] Lyocell tow was manufactured according to the above manufacturing example, wherein the spinneret included a first discharge port with a circular cross-section through which a first lyocell multifilament was injected, and a second discharge port with a non-circular cross-section through which a second lyocell multifilament was injected.

[0315] Additionally, the number of first and second discharge ports was appropriately adjusted so that the weight ratio of the first lyocell multifilament and the second lyocell multifilament included in the lyocell tow was 5 to 95.

[0316]

[0317] Comparative Example 1

[0318] Lyocell tow was manufactured according to the above manufacturing example, but the spinneret included only a first discharge port through which the first lyocell multifilament was injected. The cross-section of the first discharge port was circular.

[0319]

[0320] Comparative Example 2

[0321] Lyocell tow was manufactured according to the above manufacturing example, but the spinneret included only a second discharge port through which a second lyocell multifilament was injected. The cross-section of the second discharge port was irregular.

[0322]

[0323] Comparative Example 3

[0324] A sample of Comparative Example 3 was prepared from cellulose acetate tow sold by Celanese for use in cigarette filters.

[0325]

[0326] The space occupancy of the monofilaments included in the first lyocell multifilaments obtained in Examples 1 to 5 and Comparative Example 1 was approximately 100%. In addition, the space occupancy of the monofilaments included in the second lyocell multifilaments obtained in Examples 1 to 5 and Comparative Example 2 was approximately 130%.

[0327]

[0328] Experiment 1: Suction Resistance Evaluation

[0329] For the lyocell tows of Examples 1 to 5 and Comparative Examples 1 to 2, the required weight (relative ratio) of the lyocell tow to achieve the target suction resistance was measured. The target suction resistance was 450 mmWG / rod, and achievement of the target suction resistance was measured according to the measurement standard of KS H ISO 6565. The measurement results are shown in Table 1 below.

[0330]

[0331] Example Comparative Example 12345123 Required Weight 716660567515450724450700

[0332]

[0333] As confirmed in Table 1 above, the lyocell materials of Examples 1 to 5 were confirmed to have a lower required weight to reach the target suction resistance than the lyocell material of Comparative Example 1. Meanwhile, the lyocell materials of Examples 2 to 5 were confirmed to have a lower required weight than the cellulose acetate tow of Comparative Example 3.

[0334]

[0335] Experiment 2: Strong coefficient of variation of toe

[0336] The strength of each of the lyocell tows of Examples 1 to 5 and Comparative Examples 1 to 2 was measured, and the coefficient of variation (%) was calculated using the following method.

[0337] A 2-meter-long sample was collected from each lyocell tow. Each sample was allowed to rest and stabilize for 24 hours under conditions of 20±2°C and 65±4% humidity. One end of the stabilized sample was fixed, and a 2-kg weight was attached to the other end to apply a load. The sample was extended by the load and maintained for 5 seconds, after which it was stabilized. Each sample was then cut to 200 mm. The strength of the cut samples was evaluated using an Instron UTM (Universal Testing Machine, Model 3365). The tensile speed applied for the strength evaluation was 300 mm / min.

[0338] The strength evaluation was performed a total of 30 times for each sample, and the mean and standard deviation were calculated. Furthermore, the coefficient of variation (%) was calculated by dividing the standard deviation by the mean. The measurement results are shown in Table 2.

[0339]

[0340] Example Comparative Example 12345123 Strong coefficient of variation (%) 10.4 12.4 13.5 15.8 17.19.5 24.6 21.7

[0341]

[0342] As confirmed in Table 2 above, the lyocell materials of Examples 1 to 5 were confirmed to have a strong coefficient of variation that was about 8%p to about 15%p lower than that of the lyocell material of Comparative Example 2.

[0343] In addition, it was confirmed that the lyocell materials of Examples 1 to 5 had a strong coefficient of variation that was about 5%p to 12%p lower than that of the cellulose acetate tow of Comparative Example 3. Accordingly, it is expected that the lyocell materials of Examples 1 to 5 will be able to provide uniform and improved mechanical properties compared to the cellulose acetate tow of Comparative Example 3.

[0344] As confirmed in Tables 1 and 2 above, the lyocell materials of Examples 1 to 5 were able to achieve the target suction resistance even with a relatively small required weight, and at the same time, were able to provide a relatively small coefficient of variation of strength.

[0345] As a result, it is expected that the filter for smoking articles including Examples 1 to 5 can provide the advantages of light weight and uniform strength compared to the filter for smoking articles including Comparative Examples 1 to 2.

Claims

1. First lyocell multifilament; and Contains a second lyocell multifilament, The above first lyocell multifilament comprises a first monofilament having a first cross-section, The second lyocell multifilament comprises a second monofilament having a second cross-section, The above first cross section and the above second cross section are different, Lyocell material.

2. In paragraph 1, A lyocell material, wherein at least one of the first lyocell multifilament and the second lyocell multifilament is crimped.

3. In paragraph 1, A lyocell material, wherein at least one of the first cross-section and the second cross-section is a heterogeneous cross-section.

4. In paragraph 3, The above first cross-section is a first heterogeneous cross-section, The above second cross-section is a second heterogeneous cross-section, lyocell material.

5. In paragraph 4, The above first heterogeneous cross-section includes three protrusions, The second heterogeneous cross-section is a lyocell material comprising two protrusions, four protrusions, or five protrusions.

6. In paragraph 1, A lyocell material, wherein at least one of the first cross-section and the second cross-section is a circular cross-section.

7. In paragraph 1, The above first cross-section is a circular cross-section, The second cross-section is a lyocell material, which is a heterogeneous cross-section.

8. In paragraph 1, The space occupancy of the first monofilament is 100% to 120%, Lyocell material, wherein the space occupancy of the second monofilament is 120% to 600%.

9. In paragraph 1, The first lyocell multifilament and the second lyocell multifilament are braided, woven, non-woven, arranged or co-spinning lyocell materials.

10. In paragraph 1, The above first lyocell multifilament and the above second lyocell multifilament are bonded by a binder, The above binder is a lyocell material comprising at least one of a polyester-based binder, a cellulose-based binder and a vinyl-based binder.

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

12. In paragraph 1, A lyocell material, wherein the second lyocell multifilament is contained in an amount of 1 to 10,000 parts by weight, relative to 100 parts by weight of the first lyocell multifilament.

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

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

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

16. A smoking article comprising a filter for a smoking article according to Article 15.

17. Lyocell dope radiation stage; and A method for producing a lyocell material, comprising the steps of coagulation and obtaining multifilaments; The above Lyocell dope spinning step comprises a step of spinning a first Lyocell multifilament comprising a first monofilament and a step of spinning a second Lyocell multifilament comprising a second monofilament, A method for manufacturing a lyocell material, wherein the first cross-section of the first monofilament and the second cross-section of the second monofilament are different.

18. In paragraph 17, A method for producing a lyocell material, wherein the first lyocell multifilament and the second lyocell multifilament are spun using the same lyocell dope or are spun using different lyocell dopes.

19. In Article 17, A method for manufacturing a lyocell material, wherein the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament are performed sequentially or simultaneously.

20. In paragraph 17, A method for manufacturing a lyocell material, wherein the step of spinning the first lyocell multifilament and the step of spinning the second lyocell multifilament are performed through the same spinneret or through different spinnerets.