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

Abstract

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

Description

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

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

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

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

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

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

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

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

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

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

[0010] According to one aspect of the present application, a lyocell material (preferably lyocell tow) comprising crimped lyocell multifilament and NMMO (N-Methylmorpholine N-oxide) and having a content of NMMO of 3000 ppm or less by weight can be provided.

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

[0012] According to another aspect of the present application, a filter for a lyocell smoking article comprising a lyocell material as described above may be provided.

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

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

[0015]

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

[0017] In this specification, “lyocell multifilament” may mean a multifilament made of cellulose. In particular, the lyocell multifilament may be a (multi)filament and / or fiber made of cellulose derived or primarily derived from wood pulp, in particular a semi-synthetic (multi)filament and / or fiber.

[0018] In this specification, “cellulose” may refer to “lyocell cellulose.”

[0019] As used herein, “lyocell tow” comprises or consists of at least one lyocell multifilament.

[0020] In this specification, “yarn fineness” means the total fineness of lyocell multifilament.

[0021] In this specification, the "yarn fineness of lyocell multifilament" may alternatively be referred to as the "total fineness of lyocell multifilament." Furthermore, the total fineness of lyocell multifilament may be distinguished from the total fineness of lyocell material.

[0022] 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.

[0023] 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.

[0024] As used herein, “blooming” lyocell material, fibers and / or multifilaments refers to lyocell material and / or lyocell fibers and / or lyocell multifilaments that have been separated, uncoiled, unspooled, loosened or unwrapped from their original compressed and / or rolled state.

[0025] As used herein, “non-circular cross-section” may refer to a cross-section shape that deviates from the standard circular shape. The non-circular cross-section may include three or more protrusions, and preferably three protrusions. Here, “protrusions” may mean distinct, extended segments or arms extending outward from a central core or junction point of the monofilament cross-section. For example, the cross-section shape may have a Y-shaped cross-section, a rectangular cross-section, a star-shaped cross-section, a leaf-shaped cross-section, a hexagonal cross-section, a polygonal cross-section, etc. A non-circular cross-section that includes three protrusions may be referred to as a “Y-shaped cross-section.” Lyocell tow may have a Y-shaped cross-section in terms of its application to cigarette filters.

[0026] In this specification, “single fiber fineness of lyocell multifilament” means the fineness of one single monofilament separated from lyocell multifilament.

[0027] As used herein, “basis weight” refers to the mass per unit area of ​​the paper and / or wrapper. The basis weight of the paper and / or wrapper can be determined by measuring the mass and area of ​​the paper and / or wrapper and dividing the mass of the paper and / or wrapper by the area.

[0028] Unless otherwise specifically defined herein, “ppm” may represent weight percent.

[0029] In this specification, “draft ratio” refers to the ratio of the elongation that the radiated dope receives until it is wound up, and is the ratio of the winding speed (V0) to the discharge speed (V) of the radiated dope from the spinneret. s ) of the ratio (V) s / V0). At this time, the discharge line velocity (V0) is the speed of the dope emitted from the discharge port of the spinneret (unit: length of the dope emitted per unit time (e.g., unit m / min)), and the winding speed (V s ) is the speed (e.g., in m / min) at which the fibers or filaments formed from the radiated dope are wound.

[0030] In this specification, the “mechanism” of the washing step refers to a method for achieving washing, and may include, for example, a method for performing washing (e.g., washing tank, spraying), and conditions for performing washing (e.g., washing solution, temperature).

[0031] Unless otherwise specifically defined herein, if the properties of lyocell materials, filters for smoking articles, and their related components or compositions are affected by temperature, the temperature at which the properties are determined or measured may be room temperature. In this case, room temperature refers to a temperature in a non-thermally or non-heated state, and may be, for example, a temperature of 10 to 35°C, particularly 15 to 35°C, 20 to 30°C, or about 25°C.

[0032] In this specification, the content of NMMO was measured through high-performance liquid chromatography (HPLC) analysis.

[0033]

[0034] Hereinafter, the present invention will be described in more detail.

[0035]

[0036] 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.

[0037]

[0038] According to one aspect of the present application, a lyocell material is provided, which comprises crimped lyocell multifilament and NMMO, wherein the content of NMMO is 3000 ppm or less by weight.

[0039] In some embodiments, in the lyocell material described above, the number of crimps may be from 3.94 ea / cm to 23.62 ea / cm (10 ea / inch to 60 ea / inch).

[0040] In some embodiments, in the lyocell material described above, the number of crimps may be from 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch).

[0041] In some embodiments, in the lyocell material described above, the single fiber count of the lyocell multifilament may be from 1.11 to 8.89 dtex (1.0 to 8.0 denier).

[0042] In some embodiments, in the lyocell material described above, the single fiber count of the crimped lyocell multifilament may be from 1.67 to 12.22 dtex (1.5 to 11.0 denier).

[0043] In some embodiments, in the lyocell material described above, the yarn fineness of the lyocell multifilament may be 1,111 to 4,444 tex (10,000 to 40,000 denier).

[0044] In some embodiments, the lyocell material described above may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0045] In some embodiments, the lyocell material described above may have a total fineness of 2,222 to 5,556 tex (20,000 to 50,000 denier).

[0046] In some embodiments, the lyocell material described above may have a content of NMMO of 100 ppm or more.

[0047] In some embodiments, the lyocell material described above may have a content of NMMO of 400 ppm or more.

[0048] In some embodiments, the above-described lyocell material may satisfy two or more of the following [conditions i] to [conditions iii]:

[0049] [Condition i] The single fiber count of the crimped lyocell multifilament is 1.67 dtex (1.5 denier) or more.

[0050] [Condition ii] The yarn fineness of the lyocell multifilament is 1,111 tex (10,000 denier) or more.

[0051] [Condition iii] The total fineness of the lyocell material is 2,222 tex (20,000 denier) or more.

[0052] In some embodiments, the above-described lyocell material may satisfy all of [condition i] to [condition iii].

[0053] In some embodiments, in the lyocell material described above, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0054] In some embodiments, in the lyocell material described above, the lyocell multifilament comprises one or more monofilaments, and all of the monofilaments may have a non-circular cross-section. Alternatively, in some embodiments, the lyocell multifilament comprises one or more monofilaments, and all of the monofilaments may have a circular cross-section. In some embodiments, the lyocell material described above may be lyocell tow.

[0055] In some embodiments, the lyocell material described above may be used as a filter for a smoking article.

[0056] In some embodiments, the lyocell material described above may not be intended for tire cord.

[0057] According to another aspect of the present application, a filter for a smoking article comprising any one of the above-described lyocell materials is provided.

[0058] According to another aspect of the present application, a smoking article is provided comprising any one of the filters for smoking articles described above.

[0059] According to another aspect of the present application, a method for manufacturing a lyocell material is provided, comprising: a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step. The washing step includes two or more washing tanks, each of which independently contains a washing solution, and the temperatures of the washing solutions are independent of each other and may be at least two different temperatures. In some embodiments, the steps are performed in the order mentioned.

[0060] In some embodiments, in the method for manufacturing a lyocell material, the washing step includes two or more washing tanks, each of which independently contains a washing solution, and the temperature of the washing solution can be independently from each other between 25°C and 100°C.

[0061] In some embodiments, in the method for manufacturing the lyocell material described above, the temperatures of at least two of the washing solutions may be different.

[0062] In some embodiments, in the method for manufacturing the lyocell material described above, when the washing tank in which the lyocell multifilament is washed for the first time is called a first washing tank, the washing liquid included in the first washing tank is called a first washing liquid, the washing tank in which the lyocell multifilament is washed for the last time is called an n-th washing tank, and the washing liquid included in the n-th washing tank is called an n-th washing liquid, the temperature of the first washing liquid may be lower than the temperature of the n-th washing liquid (wherein n is a natural number greater than or equal to 2).

[0063] In some embodiments, in the method for manufacturing the lyocell material described above, the nth manufacturing tank may be a tenth washing tank, and preferably, the nth manufacturing tank may be a third washing tank.

[0064] In some embodiments, in the method for manufacturing the lyocell material described above, each of the manufacturing processes may be heated.

[0065] In some embodiments, in the method for manufacturing the lyocell material described above, the washing step further comprises spraying, and the spraying may spray one or more of the washing liquids.

[0066] In some embodiments, in the method for manufacturing the lyocell material described above, the spray may spray the first washing liquid.

[0067] In some embodiments, in the method for manufacturing the lyocell material described above, the spray may be placed on the first washing tank.

[0068] In some embodiments, in the method for manufacturing the lyocell material described above, the washing step further includes a dehydrator, and the dehydrator can extract a washing solution from the lyocell multifilament.

[0069] In some embodiments, in the method for manufacturing the lyocell material described above, the dehydrator may be placed on the washing tank.

[0070] In some embodiments, in the method for manufacturing the lyocell material described above, the dehydrator may be placed on the first washing tank.

[0071] In some embodiments, in the method for manufacturing the lyocell material described above, the dehydrator applies air pressure to the lyocell multifilament to extract the washing liquid from the lyocell multifilament, and the air pressure is 9.81 N / cm 2 147.10 N / cm 2 (1 kgf / cm 2 Up to 15 kgf / cm 2 ) may be.

[0072]

[0073] In some embodiments, the NMMO content contained in the lyocell material is 3000 ppm or less. As a result, a filter for a smoking article comprising the lyocell material described above can provide a user with a usability comparable to that of a filter for a smoking article comprising a cellulose acetate material.

[0074] On the other hand, if the content of NMMO contained in the lyocell material exceeds 3000 ppm, the user may experience an off-flavor from the filter for smoking articles, and in particular, the user may feel a sweet or sour odor from the filter for smoking articles.

[0075] In some embodiments, the content of NMMO included in the lyocell material is 3000 ppm or less, 2950 ppm or less, 2900 ppm or less, 2850 ppm or less, 2800 ppm or less, 2750 ppm or less, 2700 ppm or less, 2650 ppm or less, 2600 ppm or less, 2550 ppm or less, 2500 ppm or less, 2450 ppm or less, 2400 ppm or less, 2350 ppm or less, 2300 ppm or less, 2250 ppm or less, 2200 ppm or less, 2150 ppm or less, 2100 ppm or less, 2050 ppm or less, 2000 ppm or less, 1950 ppm or less, 1900 ppm or less, 1850 ppm or less, 1800 ppm or less, 1750 ppm or less, 1700 ppm or less, 1650 ppm or less, 1600 ppm or less, 1550 ppm or less, 1500 ppm or less, 1450 ppm or less, 1400 ppm or less, 1350 ppm or less, 1300 ppm or less, 1250 ppm or less, 1200 ppm or less, 1150 ppm or less, 1100 ppm or less, 1050 ppm or less, 1000 ppm or less, 950 ppm or less, 900 ppm or less, 850 ppm or less, 800 ppm or less, 750 ppm or less, 700 ppm or less, 650 ppm or less, 600 ppm or less, 550 ppm or less, or 500 ppm or less. As the NMMO content in the lyocell material decreases, the likelihood of a user experiencing an off-flavor from the filter for a smoking article may be further reduced. Furthermore, in some embodiments, the lyocell material may have a crimp of 3.94 to 23.62 ea / cm (10 to 60 ea / inch) while satisfying an NMMO content of 3,000 ppm or less. As a result, the lyocell material may be suitably used as a filter for a smoking article, and the filter for the smoking article may provide sufficient filtration performance.On the other hand, non-crimped lyocell multifilament may be difficult to manufacture into a filter for smoking articles due to limited swelling, or even if it is successfully manufactured, the porosity within the filter may be too large and uneven to provide sufficient filtering performance.

[0076] In addition, in some embodiments, the lyocell material can satisfy a single fiber fineness of 1.67 dtex (1.5 denier) or more, a yarn fineness of lyocell multifilament of 1,111 tex (10,000 denier) or more, and / or a total fineness of 2,222 tex (20,000 denier) or more, so that it can be suitably used as a filter for a smoking article, and at the same time, it can satisfy an NMMO content of 3000 ppm or less. As a result, it can be suitably used as a filter for a smoking article, and the filter for the smoking article can provide a user with a good quality feeling when used. In particular, in order to implement the cross-sectional circumference of a general smoking article filter, the yarn fineness of the lyocell multifilament is preferably 1,111 tex (10,000 denier) or more. In addition, the single fiber fineness and the number of monofilaments can be adjusted depending on the type of smoking article, so that the yarn fineness of the lyocell multifilament can be appropriately adjusted.

[0077] As described above, as the single fiber count increases during the process of controlling the yarn fineness of the lyocell multifilament, it may become difficult to extract NMMO from the inside of the monofilament. Alternatively, as the number of monofilaments increases, it may become difficult to extract NMMO from the monofilaments located inside the stacked monofilaments. Therefore, even with a conventional washing method, it is highly likely that reducing the NMMO content to 3000 ppm or less in lyocell material having a total filament yarn fineness of 1,111 tex (10,000 denier) or more will be limited.

[0078] On the other hand, the NMMO content of lyocell material having a yarn fineness of 1,111 tex (10,000 denier) or more can be controlled to 3,000 ppm or less through a specially designed step, such as the washing step described below. As a result, a filter for a smoking article including the lyocell multi material can provide the user with both sufficient filtering performance and a high-quality usability.

[0079]

[0080] [Irregular cross-section]

[0081] One or more of the lyocell monofilaments included in the lyocell material of the present application may have an irregular cross-section. "Irregular" means that the shape of the outer line of the cross-section is not circular, and the "cross-section" may be a cross-section obtained by cutting the lyocell monofilament virtually or actually perpendicular to the longitudinal direction of the filament.

[0082] 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 interior of the imaginary first circle, and / or the imaginary second circle may be located within the interior of 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 a “incircle.”

[0083] 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.

[0084] 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.

[0085] The heterogeneous cross-section may have a shape including multiple protrusions, for example, a Y-shaped cross-section including three protrusions. The multiple protrusions may be understood as being formed integrally with the imaginary second circle as the center, and their ends are in contact with the imaginary first circle. The terms mentioned herein have the same meanings as those described above.

[0086] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0087] <Mathematical Formula 1>

[0088] Lee Hyung-do = r1 / r2

[0089] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0090] 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.

[0091] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0092] <Mathematical Formula 2>

[0093] Space occupancy = (S1 / S2) Х 100(%)

[0094] 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.

[0095] For example, the space occupancy of a monofilament having a heterogeneous cross-section can be 120 to 600%.

[0096]

[0097] [Island]

[0098] The lyocell material of the present application includes lyocell multifilament, and the lyocell multifilament can have a fineness suitable for manufacturing a filter for a smoking article and securing its function.

[0099] For example, the single denier of the monofilaments forming the lyocell multifilament may be 1.11 to 8.89 dtex (1.0 to 8.0 denier). In this case, the single denier of the lyocell multifilament refers to the denier of one single monofilament separated from the lyocell multifilament before crimping.

[0100] In particular, the single fiber count of the lyocell multifilament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 4.44 dtex (4.0 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, 2.22 dtex (2.0 denier) or less, or 1.67 dtex (1.5 denier) or less. And, the lower limit can be, for example, 1.67 dtex (1.5 denier) or more, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, 7.78 dtex (7.0 denier) or more, or 8.33 dtex (7.5 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.

[0101] In particular, when the single fiber of the monofilament forming the lyocell multifilament is less than 1.11 dtex (1.0 denier), the draft ratio, which means the tensile rate immediately after discharge from the spinneret, may be too high, making it difficult to secure stability in the spinning process.

[0102] Conversely, if the monofilament single-fiber count exceeds 8.89 dtex (8.0 denier), initial coagulation may be limited by the single-fiber count. This can lead to stickiness and roll-up problems during initial washing, limiting the continued production of lyocell fabric.

[0103] In some embodiments, the single denier of the monofilaments forming the crimped lyocell multifilament may be from 1.67 to 12.22 dtex (1.5 to 11.0 denier). Here, the single denier of the filaments refers to the denier of one single monofilament separated from the crimped lyocell multifilament.

[0104] In particular, the single fiber count of the crimped lyocell multifilament is, for example, 11.67 dtex (10.5 denier) or less, 11.11 dtex (10.0 denier) or less, 10.56 dtex (9.5 denier) or less, 10.00 dtex (9.0 denier) or less, 9.44 dtex (8.5 denier) or less, 8.89 dtex (8.0 denier) or less, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 It may be dtex (4.5 denier) or less, 4.44 dtex (4.0 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit is, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, 7.78 dtex (7.0 denier) or more, 8.33 dtex (7.5 denier) or more, 8.89 dtex (8.0 denier) or more, 9.44 dtex (8.5 The denier) may be 10.00 dtex (9.0 denier) or more, 10.56 dtex (9.5 denier) or more, 11.11 dtex (10.0 denier) or more, or 11.67 dtex (10.5 denier) or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., hardness or implementation of suction resistance) and fairness of the filter for smoking articles.

[0105] Additionally, the lyocell multifilament may have a yarn fineness of 1,111 to 4,444 tex (10,000 to 40,000 denier). For example, the lower limit of the yarn fineness is 1,222 tex (11,000 denier) or more, 1,333 tex (12,000 denier) or more, 1,444 tex (13,000 denier) or more, 1,556 tex (14,000 denier) or more, 1,667 tex (15,000 denier) or more, 1,778 tex (16,000 denier) or more, 1,889 tex (17,000 denier) or more, 2,000 tex (18,000 denier) or more, 2,111 tex (19,000 denier) or more, 2,222 tex (20,000 denier) or more, 2,333 tex (21,000 denier) or more, 2,444 22,000 denier (tex) or more, 2,556 tex (23,000 denier) or more, 2,667 tex (24,000 denier) or more, 2,778 tex (25,000 denier) or more, 2,889 tex (26,000 denier) or more, 3,000 tex (27,000 denier) or more, 3,111 tex (28,000 denier) or more, 3,222 tex (29,000 denier) or more, 3,333 tex (30,000 denier) or more, 3,444 tex (31,000 denier) or more, 3,556 tex (32,000 denier) or more, 3,667 tex (33,000 denier) or more, 3,778 It can be 34,000 denier (tex) or more, 3,889 tex (35,000 denier) or more, 4,000 tex (36,000 denier) or more, 4,111 tex (37,000 denier) or more, 4,222 tex (38,000 denier) or more, 4,333 tex (39,000 denier) or more, and the upper limit is particularly 4,333 tex (39,000 denier) or less, 4,222 tex (38,000 denier) or less, 4,111 tex (37,000 denier) or less, 4,000 tex (36,000 denier) or less, 3,889 tex (35,000 denier) or less,3,778 tex (34,000 denier) or less, 3,667 tex (33,000 denier) or less, 3,556 tex (32,000 denier) or less, 3,444 tex (31,000 denier) or less, 3,333 tex (30,000 denier) or less, 3,222 tex (29,000 denier) or less, 3,111 tex (28,000 denier) or less, 3,000 tex (27,000 denier) or less, 2,889 tex (26,000 denier) or less, 2,778 tex (25,000 denier) or less, 2,667 tex (24,000 denier) or less, 2,556 tex (23,000 denier) or less, It may be 2,444 tex (22,000 denier) or less, 2,333 tex (21,000 denier) or less, 2,222 tex (20,000 denier) or less, 2,111 tex (19,000 denier) or less, 2,000 tex (18,000 denier) or less, 1,889 tex (17,000 denier) or less, 1,778 tex (16,000 denier) or less, 1,667 tex (15,000 denier) or less, 1,556 tex (14,000 denier) or less, 1,444 tex (13,000 denier) or less, 1,333 tex (12,000 denier) or less, or 1,222 tex (11,000 denier) or less. If the yarn fineness is outside the above range, the amount of lyocell material filled in the filter paper during the manufacture of a filter for smoking articles may be excessively small or large, which may prevent sufficient filter properties (e.g., hardness or suction resistance) from being secured, or may limit the manufacture of filters for smoking articles.

[0106] In particular, when the yarn fineness (i.e., the total fineness of the lyocell multifilament) is less than 1,111 tex (10,000 denier), the manufacture of filters for smoking articles from lyocell material may be limited. In particular, the filling of the lyocell material may not be sufficient, and the implementation of the rod shape may be limited.

[0107] Additionally, if the yarn fineness exceeds 4,444 tex (40,000 denier), the manufacture of filters for smoking articles from lyocell material may be restricted. In particular, excessive lyocell material filling may occur, which may cause the filters for smoking articles to burst. As a result, the manufacture of filters may be restricted.

[0108] The method for measuring yarn fineness is not particularly limited, but for example, a multifilament before the crimp to be measured is left in a room maintained at a temperature of 20±2℃ and a humidity of 65±4%RH for 24 hours to achieve moisture equilibrium. One end of the stabilized sample is fixed, and the opposite end is pulled so that the entire multifilament has sufficient tension, and then cut into 90 cm pieces. The weight of the obtained sample is measured and converted into denier.

[0109]

[0110] The yarn fineness of lyocell multifilament may alternatively be referred to as the "total fineness of lyocell multifilament." Furthermore, the total fineness of lyocell multifilament may be distinguished from the total fineness of lyocell material.

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

[0112] The method for measuring fineness is not particularly limited, but for example, a 2 m sample is collected from the lyocell material to be measured, for example, the lyocell material. The collected sample is left and stabilized for 24 hours in a room maintained at a temperature of 20±2℃ and a humidity of 65±4%RH. One end of the stabilized sample is fixed, and a 2 kg load is additionally attached to the opposite end. The sample, which is in an elongated state due to the load, is maintained (e.g., stabilized) for 30 seconds. Thereafter, the sample is cut into 90 cm pieces to obtain a sample. The weight of the obtained sample is measured.

[0113] According to the denier conversion method, the total denier of lyocell material is calculated by multiplying the measured weight by 10,000. In addition, the single denier of lyocell material is defined as the total denier of lyocell material divided by the number of monofilament strands of lyocell multifilament.

[0114] As described above, the total fineness of the lyocell material can be determined by the single fineness, number of monofilament strands, shape of the crimp, and number of crimps of the lyocell multifilament before crimping. Alternatively, the total fineness of the lyocell material can be determined by the single fineness and number of monofilament strands of the crimped lyocell multifilament.

[0115] In the present application, the total fineness of a lyocell material (e.g., lyocell tow) suitable for manufacturing a filter for a smoking article and securing its function can be secured, and the single fineness and number of monofilament strands of a crimped lyocell multifilament can be controlled to secure the total fineness.

[0116]

[0117] [Number of crimps]

[0118] In some embodiments, the lyocell multifilament may have crimps of 3.94 to 23.62 per centimeter (10 to 60 per inch). For example, the number of crimps may be 5.91 ea / cm (15 ea / inch) or more, 7.87 ea / cm (20 ea / inch) or more, 9.84 ea / cm (25 ea / inch) or more, 11.81 ea / cm (30 ea / inch) or more, 13.78 ea / cm (35 ea / inch) or more, 15.75 ea / cm (40 ea / inch) or more, or 17.72 ea / cm (45 ea / inch) or more, and the upper limit may be, for example, 21.65 ea / cm (55 ea / inch) or less, 19.69 ea / cm (50 ea / inch) or less, 17.72 ea / cm (45 ea / inch) or less, 15.75 ea / cm (40 ea / inch) or less, 13.78 It may be ea / cm(35 ea / inch) or less, 11.81 ea / cm(30 ea / inch) or less, or 9.84 ea / cm(25 ea / inch) or less. The number of crimps and their uniformity can be controlled through pressure and temperature conditions, etc., related to the crimping step described below.

[0119] Although not particularly limited, the number of crimps can be measured, for example, using a single-fiber property evaluation device (e.g., Favimat). In particular, a manufactured lyocell material (preferably lyocell tow) sample can be left and stabilized for 24 hours under conditions of a temperature of 20±2℃ and a humidity of 65±4%. A sample can be collected from the stabilized sample without damaging the crimp. The collected sample can be mounted on a dedicated jig with a length (gauge length) of 10 to 30 mm. The initial load during measurement can be 0.44 cN / tex (0.05 g / de), and the crimp sensitivity can be 0.01 mm. The number of crimps can be measured under the conditions described above (i.e., a temperature of 20±2℃ and a humidity of 65±4%).

[0120] 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.

[0121]

[0122] [Lyocell material]

[0123] According to one aspect of the present application, a lyocell material is provided, which comprises crimped lyocell multifilament and NMMO, wherein the NMMO content is 3000 ppm or less. The lyocell material has properties suitable for use in a filter for a smoking article.

[0124] Additionally, the NMMO content can be greater than 100 ppm and greater than 400 ppm. From a technical perspective, the process of maximizing NMMO extraction can result in damage to the lyocell multifilament depending on the method, limiting the continued production of lyocell materials.

[0125] In particular, the number of crimps of the lyocell material may be 3.94 ea / cm to 23.62 ea / cm (10 ea / inch to 60 ea / inch), and preferably, the number of crimps may be 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch). By satisfying the above-described range of the number of crimps, when a filter for a smoking article is manufactured using the lyocell material, good manufacturing processability and filtering performance can be realized.

[0126] In addition, the single fineness of the monofilaments forming the crimped lyocell multifilament may be 1.67 to 12.22 dtex (1.5 to 11.0 denier), and preferably, the single fineness of the monofilaments forming the crimped lyocell multifilament may be 2.22 to 6.67 dtex (2.0 to 6.0 denier). Since the single fineness of the monofilaments forming the crimped lyocell multifilament satisfies the above-described range, the lyocell material can provide a specific surface area suitable for a filter for a smoking article.

[0127] In addition, the total fineness (i.e., yarn fineness) of the lyocell multifilament before crimping may be 1,111 to 4,444 tex (10,000 to 40,000 denier). In addition, the lyocell material may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier), and preferably a total fineness of 2,222 to 5,556 tex (20,000 to 50,000 denier). By satisfying the yarn fineness and the total fineness of the lyocell material within the above-described range, the lyocell material may provide properties suitable for a filter for a smoking article, such as increased swelling due to crimping and thus improved filter manufacturing processability and improved filter performance.

[0128] In particular, the lyocell material may satisfy two or more of the following [conditions i] to [conditions iii]. [Conditions i] to [conditions iii] may increase the difficulty of the process of washing NMMO from the lyocell material. For example, when the single fiber density increases, the removal of NMMO from the interior of the monofilament may become more difficult.

[0129] [Condition i] The single fiber count of the crimped lyocell multifilament is 1.67 dtex (1.5 denier) or more.

[0130] [Condition ii] The yarn fineness of the lyocell multifilament is 1,111 tex (10,000 denier) or more.

[0131] [Condition iii] The total fineness of the lyocell material is 2,222 tex (20,000 denier) or more.

[0132] Therefore, in terms of manufacturing, it may be more difficult to manufacture a lyocell material that satisfies two or more of the above [conditions i] to [condition iii] and has an NMMO content of 3000 ppm or less than to manufacture a lyocell material that satisfies only one of the above [conditions i] to [condition iii] or does not satisfy any one of the above [conditions i] to [condition iii] and has an NMMO content of 3000 ppm or less.

[0133] In some embodiments, the lyocell material may satisfy all of [condition i] to [condition iii].

[0134] Additionally, the lyocell multifilament comprises one or more monofilaments, one or more of the monofilaments may have a non-circular cross-section, and preferably all of the monofilaments may have non-circular cross-sections.

[0135] In some embodiments, the lyocell material may be lyocell tow and may be used as a filter for a smoking article. However, in some embodiments, the lyocell material may not be used as a tire cord.

[0136]

[0137] [bookbinder]

[0138] In one non-limiting example, the lyocell material may further comprise a binder. The binder may be present, for example, on the surface of the lyocell multifilaments, or between the lyocell multifilaments and / or monofilaments. The binder may increase the hardness of the filter for a smoking article, thereby preventing problems such as filter jamming during the filter manufacturing process or the manufacturing process of a smoking article (e.g., cigarette).

[0139] 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.

[0140] In one non-limiting example, the binder may include a polyester-based binder, a cellulosic-based binder, and / or a vinyl-based binder.

[0141] 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.

[0142] 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.

[0143] In some embodiments, the cellulose-based binder is selected from the group consisting of hydroxypropylmethylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and combinations thereof.

[0144] 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).

[0145] In some embodiments, the vinyl binder is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and combinations thereof.

[0146] The method of applying the above binder to the lyocell material (e.g., coating) is described below.

[0147]

[0148] [emulsion]

[0149] The above lyocell material may include lyocell multifilaments; and an emulsion coated on the lyocell multifilaments. The emulsion may include (a) an ester of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol; and (b) an ester of sorbitan and a fatty acid having 16 or more carbon atoms. The emulsion may be applied to part or all of the monofilaments or multifilaments forming the lyocell material. In addition, the emulsion may penetrate between the filaments.

[0150] The emulsion comprising at least the above components (a) and (b) may have hydrophobic properties. As a result, the lyocell material treated with the emulsion may have excellent spreading properties.

[0151] In some embodiments, the lyocell material may contain a predetermined amount of the emulsion. In this case, the emulsion content may refer to OPU (wt%), which will be described later. “OPU” may refer to “oil pick up ratio.” For example, the lyocell material may contain the emulsion in an amount of 0.1 wt% or more, based on 100 wt% of the total lyocell material. In particular, the content of the emulsion may be 0.5 wt% or more, 1.0 wt% or more, 1.5 wt% or more, 2.0 wt% or more, 2.5 wt% or more, 3.0 wt% or more, especially 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.

[0152] As a method for measuring the content (OPU) of the above-mentioned emulsion, an extrusion method can be used, for example. For example, a sample (e.g., 2 to 5 g, particularly about 2.5 g) is collected (the weight of the collected sample is referred to as the sample weight) and the sample is placed in a syringe-shaped container. The material of the container is not particularly limited, but may be SUS (stainless steel). Next, a solvent (e.g., methanol) is placed in the container into which the sample has been placed (the amount of the solvent placed may be 10 ml or less (e.g., about 8 ml)). The solvent may be placed in a dropping manner when the sample is placed, and the dropping speed is controlled uniformly. Then, the solvent placed in the container as described above is allowed to fall from one end of the syringe-shaped container onto a plate. At this time, the plate is pre-weighed (the weighed weight is referred to as plate weight A), and the plate is installed so that the solvent dropped on the plate can fly away (i.e., evaporate) at a temperature of 120 to 130°C (e.g., 125°C). The above-described solvent injection and solvent dropping are performed three times, and a pressure (e.g., 98 N / cm) is applied to the sample using a syringe-shaped container. 2 (10 kgf / cm 2 ) or less, 49 N / cm 2 (5 kgf / cm 2 ) or less or 18-39 N / cm 2 (2-4 kgf / cm 2 )) and press the sample once. This sufficiently extrudes the solvent and emulsion present in the sample. Squeeze the sample by applying pressure until no solvent comes out. Afterwards, store the plate in a desiccator for 5 to 10 minutes, and measure the weight of the plate containing the sample (plate weight B). Then, calculate the emulsion content according to the formula below.

[0153] Food

[0154] Content of emulsion by extrusion (OPU, % or wt%)

[0155] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0156] In addition, the lyocell material that serves as the basis for the above-described emulsion content may be at least an emulsion-treated lyocell multifilament. For example, the lyocell material may be a lyocell multifilament that has been subjected to a primary emulsion treatment (described below), a lyocell multifilament that has been subjected to a primary emulsion treatment and a secondary emulsion treatment (described below), or a lyocell multifilament that has been subjected to both the above-described emulsion treatment and a binder, as described below. In addition, the lyocell multifilament that has been subjected to an emulsion and / or binder treatment may be crimped.

[0157] 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 excessive, crimping may not occur properly. The content of component (a) can be controlled, as described below, taking these functions into account.

[0158] With respect to the above component (a), the type of fatty acid having 16 or more carbon atoms that forms the esterified product is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an esterified product that is harmless to the human body and can be used in food can be used.

[0159] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0160] 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.

[0161] Unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32 O2) etc. However, the types of unsaturated fatty acids that can be used are not limited to these.

[0162] 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.

[0163] 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.

[0164] With respect to the above component (a), the type of aliphatic monohydric alcohol forming the ester compound is also not particularly limited. Any aliphatic monohydric alcohol capable of providing an ester compound that is harmless to the human body and can be used in food may be used.

[0165] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and they can have a linear or branched form.

[0166] In some embodiments, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. In particular, the carbon number of the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0167] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0168] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol, and stearyl alcohol.

[0169] In some embodiments, the component (a) may be an ester of isotridecanol and stearic acid (e.g., isotridecyl stearate). However, the types of component (a) that can be used are not limited thereto.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] With respect to the above component (b), the type of fatty acid having 16 or more carbon atoms that forms the esterified product is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an esterified product that is harmless to the human body and can be used in food can be used.

[0174] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0175] 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.

[0176] Unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32O2) etc. However, the types of unsaturated fatty acids that can be used are not limited to these.

[0177] 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.

[0178] 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.

[0179] In some embodiments, the component (b) may be an ester of sorbitan and oleic acid (e.g., sorbitan monooleate). However, the types of usable component (b) are not limited thereto.

[0180] (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.

[0181] For example, the emulsion may include 100 parts by weight of the esterified product of (a) a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) 20 to 60 parts by weight of the esterified product of (sorbitan) and a fatty acid having 16 or more carbon atoms.

[0182] In particular, the emulsion of the present application may contain the component (b) in an amount of 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, or 50 parts by weight or more, relative to 100 parts by weight of the component (a). In addition, the upper limit of the content of the component (b) relative to 100 parts by weight of the component (a) may be, for example, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, or 25 parts by weight or less. When the above content range is satisfied, the surface of the emulsion-treated lyocell multifilament or lyocell tow may have hydrophobicity.

[0183] For example, the emulsion may contain 40 to 80 wt% of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, based on 100 wt% of the total weight of the emulsion. In particular, the content of the component (a) may be 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, or 65 wt% or more, 70 wt% or more, or 75 wt% or more, based on 100 wt% of the total weight of the emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0184] For example, the emulsion may contain an excess amount of component (a).

[0185] For example, the emulsion may contain 15 to 55 wt% of (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, based on 100 wt% of the total weight of the emulsion. In particular, the content of the (b) component may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, based on 100 wt% of the total weight of the emulsion. And the upper limit of the content may be, for example, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, or 25 wt% or less.

[0186] For example, the emulsion may contain additional water. A small amount of water may aid in emulsification. In this specification, the terms "emulsion-treated" and "emulsified" may be used interchangeably.

[0187] 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.

[0188]

[0189] [Method for manufacturing lyocell material]

[0190] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0191] In particular, the method for manufacturing the lyocell material includes a lyocell dope spinning step; a coagulation and multifilament obtaining step; a washing step; an emulsion treatment step; and a crimping step. In addition, the method for manufacturing the lyocell material may further include a binder treatment step; and other steps.

[0192] The emulsion treatment step may be performed before the crimping step, after the crimping step, or before and after the crimping step.

[0193] 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.

[0194] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0195] 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.

[0196]

[0197] <(a) Lyocell dope radiation stage>

[0198] This step is a step of spinning a lyocell spinning dope containing lyocell cellulose (or lyocell cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0199] 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.

[0200] For example, the content of cellulose in the spinning dope may be 5 to 15 wt% based on 100 wt% of the total weight of the spinning dope. If the content of cellulose is too low, it may be difficult to implement the characteristics of the lyocell fiber, and if the content exceeds the above range, it may be difficult to dissolve in a solvent. Considering this, the content of cellulose in the spinning dope may be 6 wt% or more, 7 wt% or more, 8 wt% or more, 9 wt% or more, or 10 wt% or more, based on 100 wt% of the total weight of the spinning dope, and the upper limit thereof may be, for example, 14 wt% or less, 13 wt% or less, 12 wt% or less, 11 wt% or less, 10 wt% or less, or 9 wt% or less, based on 100 wt% of the total weight of the spinning dope.

[0201] For example, the above-mentioned radiation dope may include an N-methylmorpholine-N-oxide (NMMO) aqueous solution. The aqueous solution may include, for example, a weight ratio of 80 to 95% of N-methylmorpholine-N-oxide and a weight ratio of 5 to 20% of water, taking into account the degree of dissolution of cellulose and the process temperature.

[0202] For example, the cellulose or cellulose pulp may have an alpha-cellulose content of 85 to 97 wt% relative to 100 wt% of total cellulose and / or cellulose pulp.

[0203] For example, the cellulose or cellulose pulp may have a hemicellulose content of 1 wt% to 15 wt% relative to 100 wt% of the total cellulose and / or cellulose pulp. By adjusting the hemicellulose content within the above range, stable physical properties (e.g., hardness or suction resistance implementation) and processability of the lyocell material can be more easily secured.

[0204] Additionally, in some embodiments, the degree of polymerization (DPw) of the cellulose may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose and / or alpha-cellulose and / or hemicellulose within the cellulose pulp.

[0205] 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.

[0206] The nozzle temperature of the spinneret, particularly the spin temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the spinneret may vary depending on the spin temperature, which may impede ejection, the spin temperature may be, for example, between 100°C and 120°C or lower, or between 100°C and 110°C or lower.

[0207] For example, the step of spinning the above-described spinning dope can be performed under controlled spinning conditions so that the single filament fineness can be 1.67 dtex to 8.89 dtex (1.5 denier to 8.0 denier). For example, one or more spinning conditions among the discharge amount and spinning speed of the above-described spinning dope can be appropriately controlled so that the single filament fineness included in the lyocell material can satisfy 1.67 dtex to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness means the fineness of one monofilament separated from the multifilament.

[0208] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and ensuring fairness of a filter for smoking articles.

[0209] The radiation dope discharged through the radiation detention can go through the coagulation step described below.

[0210]

[0211] <(b) Coagulation and multifilament production step>

[0212] In this step, the radiated lyocell radiant dope is coagulated, and lyocell multifilament can be obtained.

[0213] 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.

[0214] For example, the above coagulation may include a first coagulation step of supplying cooling air to the radiated lyocell dope; and a second coagulation step of introducing the first coagulated radiated dope into a coagulation solution to coagulate it.

[0215] 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.

[0216] For example, the upper temperature limit of the cooling air used for primary coagulation may be, for example, 15°C or lower. In particular, the cooling air may be air having a temperature of 14°C or lower, 13°C or lower, 12°C or lower, 11°C or lower, or 10°C or lower. If the temperature exceeds the temperature, the solidification of the radiation dope by the air may not be sufficient, and the radiation-related processability may not be good.

[0217] The lower limit of the cooling air temperature may be determined in consideration of the spinning processability and / or the cross-sectional uniformity of the filament. For example, if the temperature of the cooling air is below 4°C, the surface of the spinneret may cool, the surface of the filament may become uneven, and the spinning processability may also deteriorate. Considering this, the cooling air temperature may be 5°C or higher, 6°C or higher, 7°C or higher, 8°C or higher, or 9°C or higher.

[0218] 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. In particular, the air volume is 100 Nm 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or more or 250 Nm 3 / h or more, and the upper limit of the airflow is, for example, 350 Nm 3 / h or less, 300 Nm 3 / h or less, 250 Nm 3 / h or less, 200 Nm 3 / h or less or 150 Nm 3 / h can be less than or equal to.

[0219] After the first coagulation step as described above, the cooled spinning dope can be supplied to a coagulation tank or bath containing a coagulating solution (secondary coagulation step). For proper coagulation to proceed, the temperature of the coagulating solution can be, for example, 30°C or lower or 25°C or lower. Furthermore, the temperature of the coagulating solution can be 10°C or higher, 15°C or higher, or 20°C or higher. By maintaining the above temperature, the coagulation rate can be appropriately maintained.

[0220] 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).

[0221] Although not particularly limited, when the coagulant contains water and NMMO, the water content in the coagulant may be 60 to 90 wt% and the NMMO content may be 10 to 40 wt% based on 100 wt% of the total coagulant. Alternatively, the coagulant may contain 70 to 80 wt% of water and 20 to 30 wt% of NMMO based on 100 wt% of the total coagulant. The concentration of the coagulant may be controlled to be maintained during the manufacturing process using a sensor or the like.

[0222]

[0223] <(c) Washing stage>

[0224] If necessary, a washing step may be performed on the lyocell multifilaments after the coagulation and multifilament steps described above. This washing step may remove any remaining NMMO and / or other impurities within the filaments.

[0225] There are no specific restrictions on the method of washing. For example, washing can be accomplished by introducing the coagulated lyocell multifilament into a washing tank using a traction roller. Alternatively, washing can be accomplished by spraying the washing solution as the traction roller moves the lyocell multifilament to the next stage.

[0226] In some embodiments, in the method for manufacturing a lyocell material, the washing step comprises two or more washing tanks, each of which independently contains a washing solution, and the temperatures of the washing solutions are independently different from each other, at least two of which are different from each other. In some embodiments, the steps are performed in the order mentioned.

[0227] In some embodiments, in the method for manufacturing a lyocell material, the washing step includes two or more washing tanks, each of which independently contains a washing liquid, and the temperature of the washing liquid can be independently from 25°C to 100°C. Preferably, the upper limit of the temperature of the washing liquid can be 95°C, 90°C, 85°C, 80°C, 75°C, 70°C, 65°C, or 60°C, and the lower limit of the temperature of the washing liquid can be 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, or 80°C.

[0228] In some embodiments, in the method for manufacturing lyocell material, the temperatures of at least two of the washing solutions may be different. By having different temperatures of the washing solutions, the extraction of NMMO can be performed continuously at relatively low and relatively high temperatures, thereby further reducing the content of NMMO contained in the lyocell material.

[0229] In some embodiments, in the method for manufacturing a lyocell material, when a washing tank in which coagulated lyocell multifilaments are washed for the first time is referred to as a first washing tank, a washing liquid contained in the first washing tank is referred to as a first washing liquid, a washing tank in which lyocell multifilaments are washed for the last time is referred to as an n-th washing tank, and a washing liquid contained in the n-th washing tank is referred to as an n-th washing liquid, the temperature of the first washing liquid may be lower than the temperature of the n-th washing liquid (wherein n is a natural number greater than or equal to 2). For example, when a washing tank in which lyocell multifilaments are washed for the last time is referred to as a second washing tank, the temperature of the first washing liquid may be lower than the temperature of the second washing liquid.

[0230] In some embodiments, in the method for manufacturing a lyocell material, the nth washing bath may be a tenth washing bath, and preferably, the nth washing bath may be a third washing bath.

[0231] Although not particularly limited, the number of washing tanks through which one coagulated lyocell multifilament is transported in the washing step may be 10 or less, 9 or less, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less, 3 or less, or 2 or less, or 2 or more, 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, 8 or more, or 9 or more.

[0232] In some embodiments, in the method for manufacturing lyocell material, each of the washing tanks can be heated. As a result, the washing solution contained in each washing tank can be heated and maintained at a high temperature.

[0233] In some embodiments, in the method for manufacturing a lyocell material, the temperature of the first washing liquid may be less than 80°C. If the temperature of the first washing liquid is 80°C or higher, the initial coagulation of the lyocell multifilament may be inhibited, resulting in a decrease in the crystallinity of the lyocell multifilament. As a result of the decrease in crystallinity, the solidification of the lyocell multifilament may not be sufficiently achieved, and the physical properties (e.g., strength) of the lyocell multifilament may not be sufficiently developed. In addition, the viscosity of the dope may be maintained due to the lack of initial coagulation. As a result, problems such as the fibers bonding and / or sticking to the roller or being rolled around the roller may occur as the fibers advance, and the manufacturing of the lyocell material may be limited.

[0234] In some embodiments, in the method for manufacturing lyocell material, the washing step may further include one or more sprays, and washing of the lyocell multifilament may be performed by spraying. The number of sprays is not particularly limited, and may be, for example, two.

[0235] In particular, the spray can spray one or more of the cleaning liquids.

[0236] Preferably, the spray can spray the first washing liquid. The first washing liquid can be supplied to the spray from the first washing tank through a pipe.

[0237] In some embodiments, in the method for manufacturing a lyocell material, the spray may be disposed on the first washing tank. This allows the first washing liquid sprayed by the spray to be re-introduced into the first washing tank. Furthermore, the washing step in the first washing tank and the washing step in the second washing tank may be performed using different mechanisms. Alternatively, the washing step in the first washing tank and the washing step in the second washing tank may be performed using the same mechanism.

[0238] In some embodiments, in the method for manufacturing a lyocell material, the spray sprays a first washing liquid, the first washing liquid is supplied to the spray from a first washing tank through a pipe, and the spray is disposed on the first washing tank, so that the first washing liquid sprayed by the spray can be contained again in the first washing tank.

[0239]

[0240] In some embodiments, in the method for manufacturing lyocell material, the washing step may further include at least one dehydrator, through which the washing liquid may be extracted from the lyocell multifilament. The number of dehydrators is not particularly limited, and may be, for example, two.

[0241] In some embodiments, in the method for manufacturing a lyocell material, a dehydrator may be disposed on at least one washing tank. Preferably, the dehydrator may be disposed on the first washing tank. In some embodiments, the dehydrator may be disposed on the first washing tank in which a sprayer is disposed. Thus, in the first washing tank, the lyocell multifilaments alternately experience spraying by the sprayer and dehydration by the dehydrator, thereby increasing the extraction efficiency of NMMO from the lyocell multifilaments.

[0242] In addition, the dehydrator can remove the washing liquid present on the surface and inside of the lyocell multifilament by suctioning it in proximity to the progressing lyocell multifilament. In particular, the suction power of the dehydrator or the air pressure provided to the dehydrator is not particularly limited, but is 9.81 N / cm 2 147.10 N / cm 2 (1 kgf / cm 2 Up to 15 kgf / cm 2 ) may be.

[0243] The components of the washing solution are not particularly limited. For example, the washing solution may include water, and preferably, may further include one or more known additives.

[0244] In some embodiments, the washing liquid further comprises water and one or more known additives.

[0245] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0246] In some embodiments, in the method for manufacturing a lyocell material, the washing step comprises one or more sprays described above and one or more dehydrators described above.

[0247] In some embodiments, in the method for manufacturing a lyocell material, the washing step comprises one or more sprays and / or one or more dehydrators as described above, arranged in one or more washing tanks.

[0248]

[0249] <(d) Milk processing stage>

[0250] If necessary, a step of emulsifying the lyocell multifilament may be performed. This step involves applying an emulsion containing the aforementioned ingredients to the surface of the filament. This emulsion treatment reduces friction on the filament and facilitates crimp formation in the crimp application step described below. If the emulsion treatment is performed two or more times, as described below, the process may be referred to as a primary emulsion treatment or a secondary emulsion treatment, depending on the order of application.

[0251] Although not specifically limited, the emulsion treatment may be carried out by immersing the lyocell multifilaments in a bath filled with the emulsion so that the lyocell multifilaments are completely submerged in the emulsion. Alternatively, the emulsion may be treated by spraying the emulsion liquid while being moved to the next stage by a traction roller.

[0252] In order to ensure that the amount of emulsion applied to the lyocell multifilament after the emulsion treatment as described above is constant, an additional process may be performed in which a roll, etc., positioned before and / or after the emulsion treatment step squeezes out the emulsion from the surface of the lyocell multifilament.

[0253] For example, the emulsion treatment may be performed so that the emulsion content (OPU: oil pick up ratio (weight %)) satisfies 1.0 wt% or more based on at least 100 wt% of the emulsion-treated lyocell multifilament. At this time, the emulsion-treated lyocell multifilament may be, for example, a lyocell multifilament to which a primary emulsion treatment has been applied, a lyocell multifilament to which a primary emulsion treatment and a secondary emulsion treatment (see the description below) have been applied, or a lyocell multifilament to which a binder, which will be described later, has been applied together with the emulsion treatment as described above. In addition, the lyocell multifilament to which the emulsion and / or binder treatment as described above has been applied may have crimping.

[0254] In particular, the content of the emulsion in the at least emulsion-treated lyocell multifilament may be at least 0.5 wt%, at least 1.0 wt%, at least 1.5 wt%, at least 2.0 wt%, at least 2.5 wt%, at least 3.0 wt%, particularly at least 3.5 wt%, at least 4.0 wt%, at least 4.2 wt%, at least 4.5 wt%, at least 5.0 wt%, at least 5.5 wt%, at least 6.0 wt%, at least 6.5 wt%, at least 7.0 wt%, at least 7.5 wt%, at least 8.0 wt%, at least 8.5 wt%, at least 9.0 wt%, or at least 9.5 wt%, based on 100 wt% of the total of the emulsion-treated lyocell multifilament. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on 100 wt% of the total weight of the lyocell multifilament treated with the emulsion. At this time, the above content may mean the dry weight after the solvent (e.g., water) or liquid component that may be included in the emulsion has evaporated.

[0255] 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.

[0256] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0257] In a specific example of the present application, one or more of the steps described above can be controlled so that the single denier of the monofilament forming the lyocell multifilament can be 1.67 to 8.89 dtex (1.5 to 8.0 denier). The single denier of the filament refers to the denier of one single monofilament separated from the multifilament.

[0258] Specifically, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and ensuring fairness of a filter for smoking articles.

[0259] 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.

[0260]

[0261] <(e) Crimp application step>

[0262] The crimping step is a step in which pressure is applied to the emulsion-treated lyocell multifilament through steam and / or a press roller to obtain a crimped multifilament, preferably a crimped tow. The crimping step may be referred to as a crimping step.

[0263] Crimping imparts waves to the lyocell multifilament, giving the fibers bulky characteristics. Crimping can be performed using a known crimping device (also referred to as a "crimper"), 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.

[0264] For example, the crimping step may be performed by first supplying steam to the lyocell multifilament to preheat and swell the lyocell multifilament, and then pressing the lyocell multifilament with a press roller to form wrinkles in the lyocell multifilament. At this time, a steam box may be used for supplying steam, and the steam box may be located upstream of the crimping device.

[0265] For example, the crimping step can be performed in such a way that the lyocell multifilament pressurization and steam application by the press roller are performed simultaneously.

[0266] For example, the above crimping step can be performed by first supplying steam to the lyocell multifilament to preheat and swell the lyocell multifilament, and then simultaneously applying pressure and steam to the lyocell multifilament by a press roller.

[0267] For example, the crimping step may be performed by applying a pressure of 0.98 to 19.61 N / cm to the lyocell multifilament before insertion into the crimping device (e.g., press roller). 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying steam.

[0268] For example, 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2 ) or more, 4.90 N / cm 2 (0.5 kgf / cm 2 ) or more or 5.88 N / cm 2 (0.6 kgf / cm 2 ) or more steam can be provided by a steam box. In addition, 14.71 N / cm 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) below steam may be provided. If the steam supply amount or pressure is below the above-mentioned range, the crimp may not be formed smoothly. In addition, if it exceeds the above-mentioned range, the flexibility of the filament increases, and excessive crimping is applied to the filament within the crimp device, so that it may not pass through the crimp device.

[0269] For example, the crimping step may be performed by pressing the lyocell multifilament with a press roller to form wrinkles in the lyocell multifilament. Furthermore, steam may not be supplied prior to pressurization, steam may not be supplied simultaneously with pressurization, or steam may not be supplied both prior to pressurization and simultaneously with pressurization.

[0270] For example, the crimping step applies a pressure of 14.71 to 39.23 N / cm to the lyocell multifilament fed into the crimping device using a press roller. 2 (1.5 to 4.0 kgf / cm 2 ) can be performed while applying pressure.

[0271] For example, 15.69 N / cm 2 (1.6 kgf / cm 2 ) above, 16.67 N / cm 2 (1.7 kgf / cm 2 ) or more, 17.65 N / cm 2 (1.8 kgf / cm 2 ) above, 18.63 N / cm 2 (1.9 kgf / cm 2 ) above, 19.61 N / cm 2 (2.0 kgf / cm 2 ) or more, 20.60 N / cm 2 (2.1 kgf / cm 2 ) above, 21.58 N / cm 2 (2.2 kgf / cm 2 ) above, 22.56 N / cm 2 (2.3 kgf / cm 2 ) above, 23.54 N / cm 2 (2.4 kgf / cm 2 ) or more or 24.52 N / cm 2 (2.5 kgf / cm 2) or more pressure can be applied to the lyocell multifilament through the press roller. Also, 38.25 N / cm 2 (3.9 kgf / cm 2 ) below, 37.27 N / cm 2 (3.8 kgf / cm 2 ) below, 36.29 N / cm 2 (3.7 kgf / cm 2 ) below, 35.31 N / cm 2 (3.6 kgf / cm 2 ) below, 34.33 N / cm 2 (3.5 kgf / cm 2 ) below, 33.35 N / cm 2 (3.4 kgf / cm 2 ) below, 32.37 N / cm 2 (3.3 kgf / cm 2 ) below, 31.39 N / cm 2 (3.2 kgf / cm 2 ) below, 30.41 N / cm 2 (3.1 kgf / cm 2 ) below, 29.42 N / cm 2 (3.0 kgf / cm 2 ) below, 28.44 N / cm 2 (2.9 kgf / cm 2 ) below, 27.46 N / cm 2 (2.8 kgf / cm 2 ) below, 26.48 N / cm 2 (2.7 kgf / cm 2 ) or less, 25.50 N / cm 2 (2.6 kgf / cm 2 ) or less or 24.52 N / cm 2 (2.5 kgf / cm 2 ) The following pressure can be applied by the press roller.

[0272] The pressure of the press roller is within the above range. If the pressure is less than the above range, the desired number of crimps may not be sufficiently formed. Furthermore, if the roller pressure exceeds the above range, the pressing force may be too strong, preventing the filaments from being smoothly fed into the crimping device or passing through the crimping device (e.g., stuffer box). Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0273] For example, using the upper plate, the pressure on the lyocell multifilament is 0.98 to 19.61 N / cm 2 (0.1 to 2 kgf / cm 2 ) can be applied to the lyocell multifilament. Additionally, the upper plate can apply pressure to the lyocell multifilament as it passes through or passes through the press roller.

[0274] For example, the pressure applied by the upper plate is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2 ) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2) below the pressure can be applied by the upper plate.

[0275] Furthermore, the pressure of the upper plate, which moves up and down to provide uniform crimp after passing through the press roller, is 0.98 N / cm 2 (0.1 kgf / ㎠), the upper plate may not be fixed due to the pressure inside the crimping device (e.g., stuffer box), and the tow may remain inside the crimping device (e.g., stuffer box) for a long time, preventing the continuity of the process. 19.61 N / cm 2 If it exceeds (2 kgf / ㎠), the steam may not be discharged smoothly inside the crimp device (e.g., stopper box), which may result in an irregular crimp shape.

[0276] For example, the crimping step may employ a doctor blade that applies a predetermined pressure to the lyocell multifilament. The doctor blade controls the residence time of the filaments fed into the crimper (e.g., stuffer box), thereby contributing to the control of the number of crimps. Such a doctor blade may be positioned, for example, in the path of the lyocell multifilaments that are discharged from the roller pressure point after being pressed by the roller described above.

[0277] For example, the crimping step uses a doctor blade to apply a pressure of 0.98 to 19.61 N / cm to the lyocell multifilaments passed through the rollers of the crimping device. 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying pressure.

[0278] For example, the pressure applied by the doctor blade is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2(0.4 kgf / cm 2 ) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) The following pressures can be applied by the doctor blade.

[0279] For example, the crimping step may be performed at a temperature in the range of 120 to 250°C. If the temperature is too low, the shape stabilization effect of the crimp may not be good, and if the temperature is too high, the concentration of the oil content in the crimping device (e.g., stuffer box) may increase, making crimp formation difficult. Therefore, considering the steam pressure described above, etc., the temperature may be appropriately controlled in the range of 130°C or higher, 140°C or higher, or 150°C or higher, and 200°C or lower, 180°C or lower, or 160°C or lower.

[0280]

[0281] <(f) Binder processing step>

[0282] For example, the method may further include a step of treating a binder to the lyocell multifilament obtained by the emulsion-treated lyocell multifilament or the crimp-imparting step.

[0283] 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.

[0284] 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 lyocell multifilaments in a bath filled with binder and / or binder solution so that the lyocell multifilaments are completely immersed in the binder. Alternatively, the binder coating on the lyocell multifilaments may be performed by spraying and / or atomizing the binder and / or binder solution using a nozzle.

[0285] The types and components of available binders are as described above, so they are omitted.

[0286] For example, the binder and / or binder solution may further include a solvent in addition to the above-described components. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin. When the binder and / or binder solution includes a solvent, the solvent content may be, for example, about 20 to 80 wt% or about 40 to 60 wt% based on 100 wt% of the total binder and / or binder solution.

[0287] The above binder treatment may be performed at a level that can achieve the purpose of the above-described binder treatment. For example, the binder treatment may be performed so that the binder content satisfies a range of 20 wt% or less, for example, 8 to 15 wt%, based on 100 wt% of the emulsion and binder-treated lyocell multifilament. In this case, the content may refer to the dry weight after the solvent or liquid component that may be included in the binder has evaporated.

[0288] After the binder is coated on the lyocell multifilament, drying of the binder may be performed. The drying temperature is not particularly limited, but drying may be performed at room temperature (approximately 10 to 35°C), for example.

[0289]

[0290] <(g) Other steps>

[0291] After crimping, additional appropriate post-processing may be performed.

[0292] For example, a secondary emulsion treatment (g1) may be additionally performed. The secondary emulsion treatment may further impart flexibility to the lyocell multifilament (e.g., lyocell tow). The secondary emulsion treatment may be performed in the same manner as or in accordance with the emulsion treatment step (d) described above.

[0293] In particular, secondary emulsion treatment can be performed by applying emulsion to lyocell multifilament (e.g., lyocell tow) that has undergone a crimper process. This can be advantageous in various processes performed during the manufacturing of filters for smoking articles. For example, secondary emulsion treatment can not only ensure that the fibers and filter are easily spreadable in air during the spreading process, but also limit fiber breakage during the drawing process.

[0294] 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.

[0295] 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.

[0296] For example, a drying process (g2) may be additionally performed. The drying process may be performed, for example, at a temperature ranging from 100 to 130°C. The drying process method or method is not particularly limited, and known techniques may be utilized. For example, the drying process may be performed by applying hot air to lyocell multifilament (e.g., lyocell tow) or by passing or leaving the tow in a temperature-controlled room for a certain period of time.

[0297] The lyocell material according to the present invention can be obtained by the method for producing the lyocell material as described above.

[0298] The lyocell material according to the present invention may be a material obtainable by the method for producing a lyocell material as described above.

[0299]

[0300] [Smoking items]

[0301] 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.

[0302] For example, lyocell material may be incorporated into a combustible cigarette. As another example, lyocell material may be incorporated into a heated cigarette, and the heated cigarette may be used in conjunction with an aerosol generating device.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309]

[0310] [Filter for smoking items]

[0311] Lyocell material can be used in filters for smoking articles. The lyocell material may be lyocell tow. For example, lyocell tow includes crimped lyocell multifilament.

[0312] For example, the present application relates to a filter for a smoking article. The filter for the smoking article comprises a lyocell material, which may be the same as described above. Furthermore, the filter for the smoking article comprises lyocell tow, which may be the same as described above.

[0313] Additionally, the lyocell material comprises the emulsion in an amount of 0.1 wt% or more relative to 100 wt% of the total lyocell material. In addition, the description of the emulsion components and content according to some embodiments is the same as described above.

[0314] For example, the single fiber count of the monofilaments forming the above lyocell multifilament may be 1.67 to 8.89 dtex (1.5 to 8.0 denier). The specific values ​​are the same as those described above.

[0315] For example, the crimped lyocell multifilament may be a lyocell material having a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier), and preferably, the lyocell material may be lyocell tow. The specific values ​​are the same as those described above.

[0316] For example, the crimped lyocell multifilament may have crimps of 3.94 to 23.62 per centimeter (10 to 60 per inch). The specific values ​​are the same as those described above.

[0317] For example, the above-described smoking article filter may further include a binder on the surface of the crimped lyocell multifilament or between the crimped lyocell multifilaments. The binder increases the hardness of the tow-made smoking article filter, thereby preventing problems such as filter jamming during the filter manufacturing process or the cigarette manufacturing process. The description of the types, components, and contents of usable binders is the same as described above.

[0318] For example, the filter for the above 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 above-described lyocell tow and can maintain the filter shape (e.g., a cylinder or a cylindrical shape).

[0319] In some embodiments, the filter for the smoking article may have a predetermined shape and size.

[0320] For example, the filter may have a rod shape. In particular, the filter for the smoking article may have a cylindrical shape.

[0321] Additionally, the filter may have a length of, for example, 10 to 50 mm. In particular, the length of the filter may have a lower limit of 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, 35 mm or more, 40 mm or more, or 45 mm or more, and an upper limit of 45 mm or less, 40 mm or less, 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0322] In some embodiments, the filter having the length may have a circular cross-section, and the circumference of the circular cross-section may be from 10 to 40 mm. For example, the circumference of the filter may have a lower limit of 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, or 35 mm or more, and an upper limit of 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0323] For example, the filter for the above 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.

[0324] 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).

[0325] For 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 the volumetric flow rate (cm2) of air passing through a 1 cm2 substrate sample (i.e., porous paper) at a pressure difference of 1 kPa. 3 min -1) can be defined. In particular, the lower limit of the porosity of the paper may be, for example, 1000 CU or more, 5000 CU or more, 10000 CU or more, 15000 CU or more, 20000 CU or more, 25000 CU or more, 30000 CU or more, 35000 CU or more, 40000 CU or more, or 45000 CU or more, and the upper limit may be, for example, 45000 CU or less, 40000 CU or less, 35000 CU or less, 30000 CU or less, 25000 CU or less, or 20000 CU or less. In some embodiments, the paper may have a porosity within a range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0326] For example, the weight of the above paper is 15 to 60 g / cm 2　 It can be. In particular, the lower limit of the basis weight of the above-mentioned paper is, for example, 20 g / cm 2 Above, 25 g / cm 2 Above, 30 g / cm 2 Above, 35 g / cm 2 Above, 40 g / cm 2 Above, 45 g / cm 2 Above, 50 g / cm 2 or more than 55 g / cm 2 It can be ideal, and the upper limit is, for example, 55 g / cm 2 Below 50 g / cm 2 Below 45 g / cm 2 Below 40 g / cm 2 Below 35 g / cm 2 Below 30 g / cm 2 Below 25 g / cm 2 Less than or equal to 20 g / cm 2 may be less than or equal to 16 g / cm. In some embodiments, the paper 2 Above, 17 g / cm 2 Above, 18 g / cm 2 Above, 19 g / cm 2Above, 20 g / cm 2 or more than 21 g / cm 2 Above, and 25 g / cm 2 Below, 24 g / cm 2 Below, 23 g / cm 2 Below, 22 g / cm 2 Less than or equal to 21 g / cm 2 It can have the following weights:

[0327] Although not particularly limited, the weight of the rod-shaped filter may be 50 mg or more. In particular, the weight of the filter may have a lower limit of, for example, 100 mg or more, 150 mg or more, or 200 mg or more, and an upper limit of, for example, 500 mg or less, 450 mg or less, 400 mg or less, 350 mg or less, 300 mg or less, 250 mg or less, or 200 mg or less.

[0328] Descriptions of other smoking articles filters and materials included therein are the same as those described above, so they are omitted.

[0329]

[0330] [Method for manufacturing filters for smoking articles]

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] Preferably, the lyocell material used in the manufacture of filters for smoking articles may be lyocell tow.

[0336] 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.

[0337] According to the present application, a lyocell material for a smoking article filter that can replace commercially available cellulose acetate (CA) and a filter for a smoking article comprising the same are provided. In particular, a lyocell material that can be used in a filter for a smoking article and can provide a high-quality feeling of use to a user is provided.

[0338]

[0339] 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.

[0340]

[0341] 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.

[0342]

[0343] [Manufacturing example]

[0344] Cellulose pulp having an alpha-cellulose content of 93.9% and a degree of polymerization (DPw) of 820 was mixed with an NMMO / H2O solvent having a propyl gallate content of 0.01 wt% to prepare a spinning dope for producing lyocell multifilament (e.g., lyocell tow) having a cellulose pulp concentration of 11 wt% based on 100 wt% of the total mixture. Then, the spinning dope was spun while maintaining the spinning temperature at 110°C in the spinning nozzle and appropriately adjusting the discharge amount and spinning speed.

[0345] The filament-phase spinning dope discharged from the spinning nozzle was supplied to the coagulating liquid (the coagulating liquid having a concentration of 75 wt% water and 25 wt% NMMO based on 100 wt% of the total coagulating liquid, and having a temperature of approximately 25°C) in the coagulating tank through the air gap section. At this time, the cooling air in the air gap section primarily coagulates the spinning dope at a temperature of 8°C and an air flow rate of 200 N㎥ / h. In addition, the concentration of the coagulating liquid was continuously monitored using a sensor and a refractometer.

[0346] Then, the coagulated lyocell filament was washed. In particular, the filament was introduced into the traction roller, and the filament was sequentially immersed in the first washing tank, the second washing tank, and the third washing tank. The first washing tank, the second washing tank, and the third washing tank contained the first washing solution, the second washing solution, and the third washing solution, respectively. The first sprayer and the first dehydrator were arranged at the top of the first washing tank. The first sprayer sprayed the first washing solution onto the filament. The first dehydrator extracted the washing solution from the filament by applying air pressure to the filament.

[0347] And, the washed filament was immersed in a processing bath designed to have a predetermined concentration of emulsion. The filament was compressed to 19.61 N / cm by a nip roll installed at the discharge end of the processing bath. 2 (2 kgf / ㎠) pressure and put into a crimp machine to give wrinkles. In particular, the pressure of the press roller was 24.52 N / cm 2 (2.5 kgf / ㎠), and the pressure of the doctor blade is 4.90 N / cm 2 The tow was manufactured by setting it to (0.5 kgf / ㎠).

[0348] To prevent static electricity and provide flexibility to the manufactured tow, a secondary emulsion treatment was performed, and immediately after the treatment, the tow product was dried by passing it through a continuous drying device set at 120°C.

[0349]

[0350] The manufactured lyocell tow may have a single fiber count of 1.67 to 12 dtex (1.5 to 10.8 denier) and a total fiber count of 2,222 to 5,556 tex (20,000 to 50,000 denier), and the yarn fiber count of the lyocell multifilament before crimping may be 1,111 to 4,444 tex (10,000 to 40,000 denier), and the number of crimps may be 5.91 to 15.75 ea / cm (15 to 40 ea / inch).

[0351]

[0352] [Example]

[0353] Examples 1 to 11

[0354] Lyocell material was manufactured according to the manufacturing example, and the single fiber count of the lyocell multifilament, the yarn fiber count of the lyocell multifilament, the single fiber count of the lyocell material, and the total fiber count of the lyocell material were as shown in Table 1 below, and the specific conditions of the washing step were as shown in Table 2 below.

[0355]

[0356] Comparative Examples 1 to 6

[0357] Lyocell material was manufactured according to the manufacturing example, and the single fiber count of the lyocell multifilament, the yarn fiber count of the lyocell multifilament, the single fiber count of the lyocell material, and the total fiber count of the lyocell material were as shown in Table 1 below, and the specific conditions of the washing step were as shown in Table 2 below.

[0358] Meanwhile, in the case of Comparative Example 4, when the single fiber of the monofilament forming the lyocell multifilament was less than 1.11 dtex (1.0 denier), the draft ratio, which means the tensile ratio immediately after being ejected from the spinneret, was too high, resulting in yarn breakage and poor stability of the spinning process, making it impossible to maintain production.

[0359] In addition, in the case of Comparative Example 5, the temperature of the first washing liquid was 80°C. As a result, the initial coagulation of the lyocell multifilament was limited, resulting in a decrease in crystallinity, and the coagulation of the lyocell multifilament was limited, and viscosity was maintained, resulting in the filaments being rolled around the roller during the transport process, making it impossible to continuously produce the lyocell material.

[0360] Meanwhile, in Comparative Example 6, due to the excessively large yarn fineness, the smoking article filter burst during the filling process. As a result, the manufacturing of the smoking article filter was limited.

[0361]

[0362] Single fiber count (dtex(d)) of Lyocell multifilament Yarn fiber count (tex(d)) of Lyocell multifilament Single fiber count (dtex(d)) of Lyocell material Total fiber count (tex(d)) of Lyocell material Example 11.11 (1.0) 3889 (35000) 1.67 (1.5) 5556 (50000) 22.22 (2.0) 2778 (25000) 3.33 (3.0) 3889 (35000) 32.22 (2.0) 2778 (25000) 3.33 (3.0) 3889 (35000) 42.22 (2.0) 2778 (25000) 3.33 (3.0) 3889 (35000) 52.22 (2.0)2778 (25000)3.33 (3.0)3889 (35000)62.22 (2.0)2778 (25000)3.33 (3.0)3889 (35000)72.22 (2.0)3333 (30000)3.33 (3.0)4444 (40000)82.22 (2.0)3889 (35000)3.33 (3.0)5556 (50000)94.44 (4.0)2778 (25000)6.67 (6.0)4444 (40000)108.33 (7.5)2222 (20000)12.00 (10.8)3333 (30000)118.89 (8.0)2222 (20000)12.22 (11.0)3333 (30000)Comparative Example 12.22 (2.0)3889 (35000)2.67 (2.4)5556 (50000)22.22 (2.0)2778 (25000)2.67 (2.4)3889 (35000)34.44 (4.0)4444 (40000)13.33 (12)5556 (50000)40.89 (0.8)3667 (33000)1.39 (1.25)5000 (45000)58.89 (8.0)3111 (28000)12.22 (11.0)3889 (35000)64.44 (4.0)5000 (45000)6.67 (6.0)5556 (60000)

[0363]

[0364] Temperature of the first washing liquid (℃) Temperature of the second washing liquid (℃) Temperature of the third washing liquid (℃) Air pressure of the first dehydrator (N / cm) 2 (kgf / cm2 ))Example 12525259.81 (1)230303049.03 (5)3303030147.10 (15)4309090147.10 (15)5259090147.10 (15)6609090147.10 (15)7609090147.10 (15)8609090147.10 (15)9609090147.10 (15)10609090147.10 (15)11609090147.10 (15)Comparative Example 12525259.81 (1)23030304.90 (0.5)3609090147.10 (15)43030309.81 (1)5809090147.10 (15)6609090147.10 (15)

[0365]

[0366]

[0367] [Evaluation example]

[0368] Experiment 1: Evaluation of NMMO Content

[0369] The NMMO content was evaluated for each of the lyocell materials according to Examples 1 to 11, Comparative Examples 1 to 3, and Comparative Examples 6 to 8. The NMMO content could not be evaluated for Comparative Examples 4 and 5 because the materials could not be manufactured.

[0370] To evaluate the NMMO content, 1.0 g of a sample was collected from each lyocell material. The sample was immersed in 40 mL of distilled water, stirred for 10 seconds, and then ultrasonically treated at 50°C for 60 minutes. NMMO was extracted during the process, yielding an NMMO solution. HPLC analysis was performed using 2 mL of the NMMO solution. The specific HPLC analysis conditions were as follows, and the evaluation results were as shown in Table 3.

[0371] Equipment: WATERS H-Class

[0372] Column: CAPCELL PACK C18 (4.6mm * 250mm * 5um)

[0373] Injection volume: 10.0 μm

[0374] Flow rate: 0.750 mL / min

[0375] Oven temperature: 50.0 ℃

[0376] UV wavelength: 192 nm

[0377] Mobile phase: A-Water, B-Acetonitrile (Isocratic) / 0-10 min: A(95%)+B(5%)

[0378]

[0379] Experiment 2: Sensory Evaluation of Filters for Smoking Products

[0380] The sensory properties of lyocell materials including the lyocell materials according to Examples 1 to 8 and the lyocell materials according to Comparative Examples 1 to 3 were evaluated. The sensory properties were evaluated on 100 consumers in their 30s and 40s using a difference identification evaluation method.

[0381] In the case of Comparative Examples 4 and 5, sensory evaluation could not be performed because production of the material was impossible, and in the case of Comparative Example 6, sensory evaluation could not be performed because production of the filter was impossible.

[0382] The evaluation results were analyzed using Analysis of Variance (ANOVA), and statistically significant differences were determined through sample testing. Descriptive responses regarding dissatisfaction were also collected. A filter for smoking products containing conventional cellulose acetate was used as a control. The evaluation results are presented in Table 3 below.

[0383]

[0384] Manufacturing fairness NMMO content (ppm, residual amount) Sensory evaluation results Example 1 Excellent 451 Same as control group 2 Excellent 2863 Same as control group 3 Excellent 2211 Same as control group 4 Excellent 874 Same as control group 5 Excellent 946 Same as control group 6 Excellent 715 Same as control group 7 Excellent 1655 Same as control group 8 Excellent 2378 Same as control group 9 Excellent 2510 Same as control group 10 Excellent 2659 Same as control group 11 Excellent 2884 Same as control Comparative example 1 Excellent 3877 Significant difference from control group 2 Excellent 5641 Significant difference from control group 3 Excellent 4227 Significant difference from control group 4 Material cannot be produced--5 Material cannot be produced--6 Filter cannot be produced 4992-

[0385]

[0386] Referring to Table 3, the lyocell materials of Examples 1 to 11 have excellent manufacturing processability, and the sensory evaluation results show that they can provide users with a feeling of use that is substantially the same as that of the control group.

[0387] On the other hand, the lyocell materials of Comparative Examples 1 to 3 were found to provide a deteriorated usability compared to the control group in the sensory evaluation results, and in particular, were reported to exhibit a sweeter and more acidic odor compared to the control group. In addition, Comparative Examples 4 to 6 could not be used in the manufacture of filters for smoking articles.

Claims

1. Contains crimped lyocell multifilament and NMMO, Lyocell material with NMMO content of 3000 ppm or less.

2. In paragraph 1, Lyocell material, wherein the number of crimps is 10 ea / inch to 60 ea / inch.

3. In paragraph 1, A lyocell material having a single denier of 1.5 to 11.0 denier of the above crimped lyocell multifilament.

4. In paragraph 1, The above lyocell multifilament yarn fineness is 10,000 to 40,000 denier, lyocell material.

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

6. In paragraph 1, Lyocell material with an NMMO content of 100 ppm or more.

7. In paragraph 1, A lyocell material satisfying two or more of the following [conditions i] to [conditions iii]: [Condition i] The single fiber count of the lyocell multifilament is 1.5 denier or more. [Condition ii] The yarn fineness of the lyocell multifilament is 10,000 denier or more. [Condition iii] The total fineness of the lyocell material is 20,000 denier or more.

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

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

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

11. In paragraph 1, Lyocell material, not for Typhoon code.

12. A filter for a smoking article comprising a lyocell material according to any one of claims 1 to 11.

13. A smoking article comprising a filter for a smoking article according to paragraph 12.

14. A method for manufacturing a lyocell material, comprising: a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step; The above washing step includes two or more washing tanks, Each washing tank contains, independently of the others, a washing solution, A method for manufacturing a lyocell material, wherein the temperatures of the washing solutions are independent of each other and at least two temperatures are different.

15. In paragraph 14, A method for manufacturing lyocell material, wherein the temperature of the washing solution is 25°C to 100°C.

16. In paragraph 14, When the washing tank in which the lyocell multifilament is washed for the first time is called the first washing tank and the washing liquid included in the first washing tank is called the first washing liquid, and the washing tank in which the lyocell multifilament is washed for the last time is called the nth washing tank and the washing liquid included in the nth washing tank is called the nth washing liquid, A method for manufacturing lyocell material, wherein the temperature of the first washing liquid is lower than the temperature of the nth washing liquid.

17. In paragraph 14, The above-mentioned manufacturing method of lyocell material is each heated.

18. In paragraph 14, The above washing step further includes spraying, A method for manufacturing a lyocell material, wherein the spray comprises spraying at least one of the washing liquids.

19. In paragraph 14, The above washing step further includes a dehydrator, The above dehydrator is a method for manufacturing lyocell material, which extracts a washing liquid from lyocell multifilament.

20. In paragraph 19, The above dehydrator applies air pressure to the lyocell multifilament to extract the washing liquid from the lyocell multifilament. The above air pressure is 1 kgf / cm 2 Within 15 kgf / cm 2 A method for manufacturing lyocell material.