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

Abstract

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

Description

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

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

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

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

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

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

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

[0007] According to 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] In particular, a lyocell material including a crimped lyocell multifilament and having a coefficient of variation of the number of crimps of 50% or less 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] Additionally, a filter for a smoking article comprising a lyocell material having a coefficient of variation of the number of crimps of 50% or less can 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] Unless otherwise specifically defined herein, if the properties of lyocell materials, filters for smoking articles, and their related components or compositions are affected by temperature, the temperature at which the properties are determined or measured may be room temperature. In this case, room temperature refers to a temperature in a non-thermally or non-heated state, and may be, for example, a temperature of 10 to 35°C, particularly 15 to 35°C, 20 to 30°C, or about 25°C.

[0018] Hereinafter, the present invention will be described in more detail.

[0019]

[0020] As used herein, "crimp" may refer to a wavy, curled or undulating configuration inherent in a material, such as a fiber, (mono)filament, multifilament and / or yarn, or imparted through a mechanical, thermal and / or chemical process. Crimp may be characterized by a periodic deviation from a straight axis along the length of the material, fiber, (mono)filament, multifilament and / or yarn. One crimp in a material, fiber, (mono)filament, multifilament and / or yarn may be defined as one repeating unit of said periodic deviation. The presence of crimp influences properties of the material and fabrics made from the material, such as elasticity, bulk, resilience and texture.

[0021]

[0022] In this specification, "standard deviation" is a measure of the variation of variable values ​​within a set of values ​​relative to the mean. A low standard deviation indicates that the variable values ​​tend to be closer to the mean (also known as the expected value) of the set, whereas a high standard deviation indicates that the variable values ​​are distributed across a wider range. The standard deviation is commonly used to determine outliers (very small or large values ​​that deviate significantly from the range of observed data) and non-outliers. The standard deviation may be abbreviated as SD or Std Dev.

[0023]

[0024] As used herein, the term "elongation at break" of a fiber or filament refers to the length that the fiber or filament extends until it breaks, expressed as a percentage (%) of the fiber's original length. The elongation (%) is calculated by dividing the difference between the final length of the fiber or filament after it is broken and its original length by the original length and multiplying this ratio by 100. In general, the elongation of a filament partially reflects the degree of ease with which the filament can be stretched. It is known that a filament with a high elongation at break relative to its breaking strength can be easily stretched even under a small load.

[0025]

[0026] 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.

[0027]

[0028] 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.

[0029] As used herein, “lyocell tow” comprises or consists of at least one lyocell multifilament.

[0030]

[0031] As used herein, “uncoiled lyocell material” refers to lyocell material and / or lyocell fibers and / or lyocell multifilaments that have been separated, uncoiled, unspooled, loosened or unwrapped from their original compressed and / or rolled state.

[0032]

[0033] As used herein, “non-circular cross-section” may refer to a cross-section shape that deviates from the standard circular shape. For example, the cross-section shape may have a Y-shaped cross-section, a rectangular cross-section, a star-shaped cross-section, a leaf-shaped cross-section, a hexagonal cross-section, a polygonal cross-section, etc. The non-circular cross-section may include three or more protrusions, and preferably three protrusions. Here, “protrusions” may mean distinct, extended segments or arms extending outward from the central core or junction point of the monofilament cross-section. A non-circular cross-section including three protrusions may be referred to as a “Y-shaped cross-section.” Lyocell tow may have a Y-shaped cross-section in terms of its application to cigarette filters.

[0034]

[0035] In some embodiments, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0036] In some embodiments, the lyocell multifilament comprises one or more monofilaments, all of which may have a heterogeneous cross-section.

[0037]

[0038] 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.

[0039] 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.

[0040]

[0041] According to one example, a lyocell material is provided comprising crimped lyocell multifilaments, wherein the coefficient of variation of the number of crimps (or "first coefficient of variation") is 50% or less.

[0042] In some embodiments, the coefficient of variation of the number of crimps may be less than 25%.

[0043] In some embodiments, the coefficient of variation of the number of crimps may be greater than 10%.

[0044] In some embodiments, the coefficient of variation of the number of crimps may be a value calculated according to Equation 1.

[0045] [Formula 1]

[0046] Coefficient of variation of crimp count (%) = [(standard deviation of crimp count) / (mean of crimp count)] * 100

[0047] In Equation 1, the average number of crimps and the standard deviation of the number of crimps may be values ​​calculated for two or more monofilaments included in the lyocell material. Preferably, the average number of crimps and the standard deviation of the number of crimps may be values ​​calculated for 50 or more monofilaments included in the lyocell material.

[0048] In some embodiments, the coefficient of variation of the number of crimps may be a value calculated according to Equation 1-1.

[0049] [Formula 1-1]

[0050] Coefficient of variation of crimp count (%) = [(Standard deviation of crimp count of central and edge filaments) / (Average of crimp count of central and edge filaments)] * 100

[0051] In Equation 1-1, for an imaginary first line that is parallel to the longitudinal direction of the lyocell material and passes through the center point of the lyocell material, an imaginary second line that is parallel to the first line and passes through one end of the lyocell material, and an imaginary third line that is parallel to the second line and passes through the other end of the lyocell material, a central filament refers to a monofilament that is located closer to the first line than to the second or third line, and an edge filament refers to a monofilament that is located closer to the second or third line than to the first line.

[0052] Preferably, in Equation 1-1, the average number of crimps and the standard deviation of the number of crimps may be values ​​calculated for 50 or more central filaments and 50 or more peripheral filaments included in the lyocell material.

[0053] In some embodiments, the number of crimps can be from 3.94 ea / cm to 23.62 ea / cm (10 ea / inch to 60 ea / inch).

[0054] In some embodiments, the number of crimps can be from 9.84 ea / cm to 17.72 ea / cm (25 ea / inch to 45 ea / inch).

[0055] In some embodiments, the tensile strength may be from 0.026 N / tex to 0.088 N / tex (0.3 gf / d to 1.0 gf / d).

[0056] In some embodiments, the coefficient of variation of the tensile strength (or “second coefficient of variation”) may be less than or equal to 70%.

[0057] In some embodiments, the coefficient of variation of tensile strength may be less than 50%.

[0058] In some embodiments, the coefficient of variation of the tensile strength may be greater than or equal to 0%.

[0059] In some embodiments, the coefficient of variation of tensile strength may be greater than 30%.

[0060] In some embodiments, the coefficient of variation of tensile strength may be a value calculated according to Equation 2.

[0061] [Formula 2]

[0062] Coefficient of variation of tensile strength (%) = [(standard deviation of tensile strength) / (mean of tensile strength)] * 100

[0063] In Equation 2, the average tensile strength and the standard deviation of the tensile strength are values ​​calculated for two or more monofilaments included in the lyocell material. Preferably, the average tensile strength and the standard deviation of the tensile strength may be values ​​calculated for 50 or more monofilaments included in the lyocell material.

[0064] In some embodiments, the coefficient of variation of tensile strength may be a value calculated according to Equation 2-1.

[0065] [Formula 2-1]

[0066] Coefficient of variation of tensile strength (%) = [(Standard deviation of tensile strength of central and edge filaments) / (Average of tensile strength of central and edge filaments)] * 100

[0067] In Equation 2-1, for an imaginary first line that is parallel to the longitudinal direction of the lyocell material and passes through the center point of the lyocell material, an imaginary second line that is parallel to the first line and passes through one end of the lyocell material, and an imaginary third line that is parallel to the second line and passes through the other end of the lyocell material, a central filament refers to a monofilament that is located closer to the first line than to the second or third line, and an edge filament refers to a monofilament that is located closer to the second or third line than to the first line.

[0068] In some embodiments, the mean of tensile strength and the standard deviation of tensile strength in Equation 2-1 may be values ​​calculated for 50 or more central filaments and 50 or more peripheral filaments included in the lyocell material.

[0069] In some embodiments, the break strength may be between 2.0% and 10.0%.

[0070] In some embodiments, the coefficient of variation of the cut length may be less than 50%.

[0071] In some embodiments, the coefficient of variation of the cutting elongation may be less than 30%.

[0072] In some embodiments, the coefficient of variation of the cut length may be greater than or equal to 0%.

[0073] In some embodiments, the coefficient of variation of the cut length may be greater than 20%.

[0074] In some embodiments, the coefficient of variation of the cut length (or “third coefficient of variation”) may be a value calculated according to Equation 3.

[0075] [Formula 3]

[0076] Coefficient of variation of breaking elongation (%) = [(standard deviation of breaking elongation) / (mean of breaking elongation)] * 100

[0077] In Equation 3, the average breaking elongation and the standard deviation of the breaking elongation are values ​​calculated for two or more monofilaments included in the lyocell material. Preferably, the average breaking elongation and the standard deviation of the breaking elongation may be values ​​calculated for 50 or more monofilaments included in the lyocell material.

[0078] In some embodiments, the coefficient of variation of the cutting elongation may be a value calculated according to Equation 3-1.

[0079] [Formula 3-1]

[0080] Coefficient of variation of breaking elongation (%) = [(Standard deviation of breaking elongation of central and edge filaments) / (Average of breaking elongation of central and edge filaments)] * 100

[0081] In Equation 3-1, for an imaginary first line that is parallel to the longitudinal direction of the lyocell material and passes through the center point of the lyocell material, an imaginary second line that is parallel to the first line and passes through one end of the lyocell material, and an imaginary third line that is parallel to the second line and passes through the other end of the lyocell material, a central filament refers to a monofilament that is located closer to the first line than to the second or third line, and an edge filament refers to a monofilament that is located closer to the second or third line than to the first line.

[0082] In some embodiments, in Equation 3-1, the mean breaking elongation and the standard deviation of the breaking elongation may be values ​​calculated for 50 or more central filaments and 50 or more peripheral filaments included in the lyocell material.

[0083] In some embodiments, the number of crimps may be from 3.94 ea / cm to 23.62 ea / cm (10 ea / inch to 60 ea / inch), the coefficient of variation of the number of crimps may be from 10% to 50%, and the coefficient of variation of the number of crimps may be a value calculated by Equation 1-1, the tensile strength may be from 0.026 N / tex to 0.088 N / tex (0.3 gf / d to 1.0 gf / d), the coefficient of variation of the tensile strength may be from 30% to 70%, and the coefficient of variation of the tensile strength may be a value calculated by Equation 2-1, and the elongation at break may be from 2.0% to 10.0%, the coefficient of variation of the elongation at break may be from 20% to 50%, and the coefficient of variation of the elongation at break may be a value calculated by Equation 3-1.

[0084] In some embodiments, the single fiber count of the lyocell multifilament may be from 1.67 to 8.89 dtex (1.5 to 8.0 denier).

[0085] In some embodiments, the lyocell material may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0086] In some embodiments, the lyocell material may be lyocell tow.

[0087] In some embodiments, the lyocell material may be a filter for a smoking article.

[0088] Also provided is a filter for a smoking article comprising any one of the described lyocell materials.

[0089] Additionally, a smoking article comprising a filter for the described smoking article is provided.

[0090] In addition, a method for producing a lyocell material is provided, including a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step.

[0091] In some embodiments, the crimping step is performed by a crimping device comprising one or more side plates, wherein the surface roughness of the side plates may be less than or equal to 1000 nm.

[0092] In this specification, "surface roughness" refers to the irregularity of a surface. There are several parameters (parameters) used to measure the roughness of a profile, the most common of which is the Ra value. Ra measures the arithmetic mean of surface irregularities, including deviations from the mean line, within a certain sampling length. Surface roughness measurements can be performed using a profilometer or a laser scanner. The larger the deviation, the rougher the surface, and the smaller the Ra, the smoother the surface. Ra is expressed in nanometers (nm), micrometers (μm), or microinches (μin).

[0093] In some embodiments, when the crimp device includes two or more side plates, the surface roughness of the two or more side plates may be, independently of each other, 1000 nm or less.

[0094] In some embodiments, the surface roughness of the side plate may be greater than 100 nm.

[0095] In some embodiments, when the crimp device includes two or more side plates, the surface roughness of the two or more side plates may be, independently of each other, greater than or equal to 100 nm.

[0096] In some embodiments, the crimp device further comprises one or more blades, wherein the surface roughness of the blades may be less than 1200 nm.

[0097] In some embodiments, the crimp device further comprises one or more blades, wherein the surface roughness of the blades may be less than or equal to 1100 nm.

[0098] In some embodiments, the crimp device includes a first blade and a second blade, the first blade and the second blade being spaced apart from each other, and a surface roughness of the first blade and a surface roughness of the second blade being independently less than 1200 nm.

[0099]

[0100] In some embodiments, the first coefficient of variation of the lyocell material may be less than or equal to 50%, and the first coefficient of variation may be greater than or equal to 0%. A lyocell material having a first coefficient of variation within the above-described numerical range is expected to have a uniform number of crimps throughout the lyocell material.

[0101] In some embodiments, the upper bound of the first coefficient of variation (i.e., the coefficient of variation of the number of crimps) may be 50% or less, 48% or less, 46% or less, 44% or less, 42% or less, 40% or less, 38% or less, 36% or less, 34% or less, 32% or less, 30% or less, 28% or less, 26% or less, 24% or less, 22% or less, 20% or less, 18% or less, 16% or less, 14% or less, or 12% or less. Additionally, the lower bound of the first coefficient of variation may be 10% or more, 12% or more, 14% or more, 16% or more, 18% or more, 20% or more, 22% or more, 24% or more, 26% or more, 28% or more, 30% or more, 32% or more, 34% or more, 36% or more, 38% or more, 40% or more, 42% or more, 44% or more, 46% or more, or 48% or more. In some embodiments, the first coefficient of variation may be 10% to 50%, 10% to 48%, 10% to 46%, 10% to 44%, 10% to 42%, 10% to 40%, 10% to 38%, 10% to 36%, 10% to 34%, 10% to 32%, 10% to 30%, 10% to 28%, 10% to 26%, 10% to 24%, 10% to 22%, 10% to 20%, 10% to 18%, 10% to 16%, 10% to 14%, 10% to 12%, 12% to 50%, 12% to 48%, 12% to 46%, 12% to 44%, 12% to 42%, 12% to 40%, 12% to 38%, 12% to 36%, 12% to 34%, 12% to 32%, 12% to 30%, 12% to 28%, 12% to 26%, 12% to 24%, 12% to 22%, 12% to 20%, 12% to 18%, 12% to 16%, 12% to 14%,14% to 50%, 14% to 48%, 14% to 46%, 14% to 44%, 14% to 42%, 14% to 40%, 14% to 38%, 14% to 36%, 14% to 34%, 14% to 32%, 14% to 30%, 14% to 28%, 14% to 26%, 14% to 24%, 14% to 22%, 14% to 20%, 14% to 18%, 14% to 16%, 16% to 50%, 16% to 48%, 16% to 46%, 16% to 44%, 16% to 42%, 16% to 40%, 16 % to 38%, 16% to 36%, 16% to 34%, 16% to 32%, 16% to 30%, 16% to 28%, 16% to 26%, 16% to 24%, 16% to 22%, 16% to 20%, 16% to 18%, 18% to 50%, 18% to 48%, 18% to 46%, 18% to 44%, 18% to 42%, 18% to 40%, 18% to 38%, 18% to 36%, 18% to 34%, 18% to 32%, 18% to 30%, 18% to 28%, 18% to 26%, 18% to 24 %, 18% to 22%, 18% to 20%, 20% to 50%, 20% to 48%, 20% to 46%, 20% to 44%, 20% to 42%, 20% to 40%, 20% to 38%, 20% to 36%, 20% to 34%, 20% to 32%, 20% to 30%, 20% to 28%, 20% to 26%, 20% to 24%, 20% to 22%, 22% to 50%, 22% to 48%, 22% to 46%, 22% to 44%, 22% to 42%,22% to 40%, 22% to 38%, 22% to 36%, 22% to 34%, 22% to 32%, 22% to 30%, 22% to 28%, 22% to 26%, 22% to 24%, 24% to 50%, 24% to 48%, 24% to 46%, 24% to 44%, 24% to 42%, 24% to 40%, 24% to 38%, 24% to 36%, 24% to 34%, 24% to 32%, 24% to 30%, 24% to 28%, 24% to 26%, 26% to 50%, 26% to 48%, 26 % to 46%, 26% to 44%, 26% to 42%, 26% to 40%, 26% to 38%, 26% to 36%, 26% to 34%, 26% to 32%, 26% to 30%, 26% to 28%, 28% to 50%, 28% to 48%, 28% to 46%, 28% to 44%, 28% to 42%, 28% to 40%, 28% to 38%, 28% to 36%, 28% to 34%, 28% to 32%, 28% to 30%, 30% to 50%, 30% to 48%, 30% to 46%, 30% to 44 %, 30% to 42%, 30% to 40%, 30% to 38%, 30% to 36%, 30% to 34%, 30% to 32%, 32% to 50%, 32% to 48%, 32% to 46%, 32% to 44%, 32% to 42%, 32% to 40%, 32% to 38%, 32% to 36%, 32% to 34%, 34% to 50%, 34% to 48%, 34% to 46%, 34% to 44%, 34% to 42%, 34% to 40%, 34% to 38%,34% to 36%, 36% to 50%, 36% to 48%, 36% to 46%, 36% to 44%, 36% to 42%, 36% to 40%, 36% to 38%, 38% to 50%, 38% to 48%, 38% to 46%, 38% to 44%, 38% to 42%, 38% to 40%, 40% to 50%, 40% to 48%, 40% to 46%, 40% to 44%, 40% to 42%, 42% to 50%, 42% to 48%, 42% to 46%, 42% to 44%, 44% to 50%, 44 % to 48%, 44% to 46%, 46% to 50%, 46% to 48%, or 48% to 50%.

[0102] In some embodiments, the second coefficient of variation of the lyocell material may be less than or equal to 70% and greater than or equal to 30%. A lyocell material satisfying the above-described numerical range is expected to have a uniform tensile strength throughout the lyocell material.

[0103] In some embodiments, the second coefficient of variation of the lyocell material is from 30% to 70%, from 30% to 68%, from 30% to 66%, from 30% to 64%, from 30% to 62%, from 30% to 60%, from 30% to 58%, from 30% to 56%, from 30% to 54%, from 30% to 52%, from 30% to 50%, from 30% to 48%, from 30% to 46%, from 30% to 44%, from 30% to 42%, from 30% to 40%, from 30% to 38%, from 30% to 36%, from 30% to 34%, from 30% to 32%, from 32% to 70%, from 32% to 68%, from 32% to 66%. 32% to 64%, 32% to 62%, 32% to 60%, 32% to 58%, 32% to 56%, 32% to 54%, 32% to 52%, 32% to 50%, 32% to 48%, 32% to 46%, 32% to 44%, 32% to 42%, 32% to 40%, 32% to 38%, 32% to 36%, 32% to 34%, 34% to 70%, 34% to 68%, 34% to 66%, 34% to 64%, 34% to 62%, 34% to 60%, 34% to 58%, 34% to 56%, 34% to 54%, 34% to 52%, 34% to 50%, 34% to 48%, 34% to 46%, 34% to 44%, 34% to 42%, 34% to 40%, 34% to 38%, 34% to 36%, 36% to 70%, 36% to 68%, 36% to 66%, 36% to 64%, 36% to 62%, 36% to 60%, 36% to 58%, 36% to 56%, 36% to 54%, 36% to 52%, 36% to 50%, 36% to 48%,36% to 46%, 36% to 44%, 36% to 42%, 36% to 40%, 36% to 38%, 38% to 70%, 38% to 68%, 38% to 66%, 38% to 64%, 38% to 62%, 38% to 60%, 38% to 58%, 38% to 56%, 38% to 54%, 38% to 52%, 38% to 50%, 38% to 48%, 38% to 46%, 38% to 44%, 38% to 42%, 38% to 40%, 40% to 70%, 40% to 68%, 40% to 66%, 40 % to 64%, 40% to 62%, 40% to 60%, 40% to 58%, 40% to 56%, 40% to 54%, 40% to 52%, 40% to 50%, 40% to 48%, 40% to 46%, 40% to 44%, 40% to 42%, 42% to 70%, 42% to 68%, 42% to 66%, 42% to 64%, 42% to 62%, 42% to 60%, 42% to 58%, 42% to 56%, 42% to 54%, 42% to 52%, 42% to 50%, 42% to 48%, 42% to 46 %, 42% to 44%, 44% to 70%, 44% to 68%, 44% to 66%, 44% to 64%, 44% to 62%, 44% to 60%, 44% to 58%, 44% to 56%, 44% to 54%, 44% to 52%, 44% to 50%, 44% to 48%, 44% to 46%, 46% to 70%, 46% to 68%, 46% to 66%, 46% to 64%, 46% to 62%, 46% to 60%, 46% to 58%, 46% to 56%,46% to 54%, 46% to 52%, 46% to 50%, 46% to 48%, 48% to 70%, 48% to 68%, 48% to 66%, 48% to 64%, 48% to 62%, 48% to 60%, 48% to 58%, 48% to 56%, 48% to 54%, 48% to 52%, 48% to 50%, 70% to 70%, 50% to 68%, 50% to 66%, 50% to 64%, 50% to 62%, 50% to 60%, 50% to 58%, 50% to 56%, 50% to 54%, 50 % to 52%, 52% to 70%, 52% to 68%, 52% to 66%, 52% to 64%, 52% to 62%, 52% to 60%, 52% to 58%, 52% to 56%, 52% to 54%, 54% to 70%, 54% to 68%, 54% to 66%, 54% to 64%, 54% to 62%, 54% to 60%, 54% to 58%, 54% to 56%, 56% to 70%, 56% to 68%, 56% to 66%, 56% to 64%, 56% to 62%, 56% to 60%, 56% to 58 %, 58% to 70%, 58% to 68%, 58% to 66%, 58% to 64%, 58% to 62%, 58% to 60%, 60% to 70%, 60% to 68%, 60% to 66%, 60% to 64%, 60% to 62%, 62% to 70%, 62% to 68%, 62% to 66%, 62% to 64%, 64% to 70%, 64% to 68%, 64% to 66%, 66% to 70%, 66% to 68% or 68% to 70%. In some embodiments,The third coefficient of variation of the lyocell material may be less than or equal to 50% and greater than or equal to 20%. A lyocell material satisfying the above-described numerical range is expected to have a uniform breaking elongation throughout the lyocell material.

[0104] In some embodiments, the third coefficient of variation of the lyocell material is from 20% to 50%, from 20% to 48%, from 20% to 46%, from 20% to 44%, from 20% to 42%, from 20% to 40%, from 20% to 38%, from 20% to 36%, from 20% to 34%, from 20% to 32%, from 20% to 30%, from 20% to 28%, from 20% to 26%, from 20% to 24%, from 20% to 22%, from 22% to 50%, from 22% to 48%, from 22% to 46%, from 22% to 44%, from 22% to 42%, from 22% to 40%, from 22% to 38%, from 22% to 36%. 22% to 34%, 22% to 32%, 22% to 30%, 22% to 28%, 22% to 26%, 22% to 24%, 24% to 50%, 24% to 48%, 24% to 46%, 24% to 44%, 24% to 42%, 24% to 40%, 24% to 38%, 24% to 36%, 24% to 34%, 24% to 32%, 24% to 30%, 24% to 28%, 24% to 26%, 26% to 50%, 26% to 48%, 26% to 46%, 26% to 44%, 26% to 42%, 26% to 40%, 26% to 38%, 26% to 36%, 26% to 34%, 26% to 32%, 26% to 30%, 26% to 28%, 28% to 50%, 28% to 48%, 28% to 46%, 28% to 44%, 28% to 42%, 28% to 40%, 28% to 38%, 28% to 36%, 28% to 34%, 28% to 32%, 28% to 30%, 30% to 50%, 30% to 48%, 30% to 46%, 30% to 44%,30% to 42%, 30% to 40%, 30% to 38%, 30% to 36%, 30% to 34%, 30% to 32%, 32% to 50%, 32% to 48%, 32% to 46%, 32% to 44%, 32% to 42%, 32% to 40%, 32% to 38%, 32% to 36%, 32% to 34%, 34% to 50%, 34% to 48%, 34% to 46%, 34% to 44%, 34% to 42%, 34% to 40%, 34% to 38%, 34% to 36%, 36% to 50%, 36 % to 48%, 36% to 46%, 36% to 44%, 36% to 42%, 36% to 40%, 36% to 38%, 38% to 50%, 38% to 48%, 38% to 46%, 38% to 44%, 38% to 42%, 38% to 40%, 40% to 50%, 40% to 48%, 40% to 46%, 40% to 44%, 40% to 42%, 42% to 50%, 42% to 48%, 42% to 46%, 42% to 44%, 44% to 50%, 44% to 48%, 44% to 46%, 46% to 50 %, 46% to 48%, or 48% to 50%. As a means for controlling the first coefficient of variation, the second coefficient of variation and / or the third coefficient of variation of the lyocell material, the surface roughness (Ra,) of the side plate included in the crimp device 1 ) can be considered. By controlling the surface roughness of the side plate, the contact area and contact strength between the side plate and the lyocell multifilament can be controlled, and the magnitude of the frictional force generated between the side plate and the lyocell multifilament can be controlled.

[0105] As a result, while imparting a predetermined number of crimps to the lyocell multifilament, damage to the lyocell multifilament by the side plates can be suppressed. Consequently, the central and peripheral filaments can maintain similar characteristics, and the uniformity of the lyocell material can be improved. Furthermore, the performance (e.g., filtering capacity) of a filter for a smoking article comprising the lyocell material can be improved.

[0106] As another means for controlling the first coefficient of variation, the second coefficient of variation and / or the third coefficient of variation of the lyocell material, the surface roughness (Ra) of the blade included in the crimp device 2 ) can be considered. By adjusting the surface roughness of the side plate, the contact strength between the blade and the lyocell multifilament can be adjusted, and the magnitude of the frictional force generated between the blade and the lyocell multifilament can be adjusted.

[0107] As a result, damage to the lyocell multifilament by the blade can be suppressed during the transport process. This improves the uniformity of the lyocell material. Furthermore, the performance (e.g., filtration capacity) of a filter for a smoking article containing the lyocell material can be improved.

[0108]

[0109] [Irregular cross-section]

[0110] 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.

[0111] 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.”

[0112] 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.

[0113] 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.

[0114] The heterogeneous cross-section may have a shape including multiple protrusions, for example, a Y-shaped cross-section including three protrusions. It may be understood that the multiple protrusions are formed integrally with the imaginary second circle as the center, and that their ends are in contact with the imaginary first circle. The terms mentioned herein have the same meanings as those described above.

[0115] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0116] <Mathematical Formula 1>

[0117] Lee Hyung-do = r1 / r2

[0118] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0119] 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.

[0120] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0121] <Mathematical Formula 2>

[0122] Space occupancy = (S1 / S2) Х 100(%)

[0123] 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.

[0124] For example, the space occupancy of a monofilament having a heterogeneous cross-section can be 120 to 600%.

[0125]

[0126] [Island]

[0127] 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.

[0128] For example, the single filament fineness of the filaments forming the above lyocell multifilament may be 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness refers to the fineness of one monofilament separated from the multifilament.

[0129] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., hardness or implementation of suction resistance) and fairness of the filter for smoking articles.

[0130] For example, the lyocell multifilament may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier). For example, the lower limit of the total fineness is, for example, 1,778 tex (16,000 denier) or more, 1,833 tex (16,500 denier) or more, 1,889 tex (17,000 denier) or more, 1,944 tex (17,500 denier) or more, 2,000 tex (18,000 denier) or more, 2,056 tex (18,500 denier) or more, 2,111 tex (19,000 denier) or more, 2,167 tex (19,500 denier) or more, 2,222 tex (20,000 denier) or more, 2,278 tex (20,500 denier) or more, 2,333 tex (21,000 denier) or more, 2,389 21,500 denier (tex) or more, 2,444 tex (22,000 denier) or more, 2,500 tex (22,500 denier) or more, 2,556 tex (23,000 denier) or more, 2,611 tex (23,500 denier) or more, 2,667 tex (24,000 denier) or more, 2,722 tex (24,500 denier) or more, 2,778 tex (25,000 denier) or more, 2,833 tex (25,500 denier) or more, 2,889 tex (26,000 denier) or more, 2,944 tex (26,500 denier) or more, 3,000 tex (27,000 denier) or more, 3,056 tex (27,500 denier) or more, 3,111 tex (28,000 denier) or more, 3,167 tex (28,500 denier) or more, 3,222 tex (29,000 denier) or more, 3,287 tex (29,500 denier) or more, 3,333 tex (30,000 denier) or more, 3,389 tex (30,500 denier) or more, 3,444 tex (31,000 denier) or more, 3,500 tex (31,500 denier) or more, 3,556 tex (32,000 denier) or more, 3,611 tex (32,500 denier) or more, 3,667 tex (33,000 denier) or more, 3,722 tex (33,500 denier) or more, 3,778 tex (34,000 denier) or more, 3,833 tex (34,500 denier) or more, 3,889 tex (35,000 denier) or more, 3,944 tex (35,500 denier) or more, 4,000 tex (36,000 denier) or more, 4,056 tex (36,500 denier) or more, 4,111 tex (37,000 denier) or more, 4,167 tex (37,500 denier) or more, 4,222 tex (38,000 denier) or more, 4,278 tex (38,500 denier) or more, 4,333 tex (39,000 denier) or more, 4,389 tex (39,500 denier) or more, 4,444 tex (40,000 denier) or more, 4,500 tex (40,500 denier) or more, 4,556 tex (41,000 denier) or more, 4,611 tex (41,500 denier) or more, 4,667 tex (42,000 denier) or more, 4,722 tex (42,500 denier) or more, 4,778 tex (43,000 denier) or more, 4,833 tex (43,500 denier) or more, 4,889 tex (44,000 denier) or more, 4,944 tex (44,500 denier) or more, 5,000 tex (45,000 denier) or more, 5,056 tex (45,500 denier) or more, 5,111 tex (46,000 denier) or more, 5,167 tex (46,500 denier) or more, 5,222 tex (47,000 denier) or more, 5,278 tex (47,500 denier) or more, 5,333 tex (48,000 denier) or more, 5,389 tex (48,500 denier) or more, 5,444 tex (49,000 denier) or more, 5,500 tex (49,500 denier) or more, 5,556 tex (50,000 denier) or more, 5,611 tex (50,500 denier) or more, 5,667 tex (51,000 denier) or more, 5,722 tex (51,500 denier) or more, 5,778 tex (52,000 denier) or more, 5,833 tex (52,500 denier) or more, 5,889 tex (53,000 denier) or more, 5,944 tex (53,500 denier) or more, 6,000 tex (54,000 denier) or more, or 6,056 tex (54,500 denier) or more. And, the upper limit is, for example, 6,056 tex (54,500 denier) or less, 6,000 tex (54,000 denier) or less, 5,944 tex (53,500 denier) or less, 5,889 tex (53,000 denier) or less, 5,833 tex (52,500 denier) or less, 5,778 tex (52,000 denier) or less, 5,722 tex (51,500 denier) or less, 5,667 tex (51,000 denier) or less, 5,611 tex (50,500 denier) or less, 5,556 tex (50,000 denier) or less, 5,500 tex (49,500 denier) or less, 5,444 tex (49,000 denier) or less, 5,389 tex (48,500 denier) or less, 5,333 tex (48,000 denier) or less, 5,278 tex (47,500 denier) or less, 5,222 tex (47,000 denier) or less, 5,167 tex (46,500 denier) or less, 5,111 tex (46,000 denier) or less, 5,056 tex (45,500 denier) or less, 5,000 tex (45,000 denier) or less, 4,944 tex (44,500 denier) or less, 4,889 tex (44,000 denier) or less, 4,833 tex (43,500 denier) or less, 4,778 tex (43,000 denier) or less, 4,722 tex (42,500 denier) or less, 4,667 tex (42,000 denier) or less, 4,611 tex (41,500 denier) or less, 4,556 tex (41,000 denier) or less, 4,500 tex (40,500 denier) or less, 4,444 tex (40,000 denier) or less, 4,389 tex (39,500 denier) or less, 4,333 tex (39,000 denier) or less,4,278 tex (38,500 denier) or less, 4,222 tex (38,000 denier) or less, 4,167 tex (37,500 denier) or less, 4,111 tex (37,000 denier) or less, 4,056 tex (36,500 denier) or less, 4,000 tex (36,000 denier) or less, 3,944 tex (35,500 denier) or less, 3,889 tex (35,000 denier) or less, 3,833 tex (34,500 denier) or less, 3,778 tex (34,000 denier) or less, 3,722 tex (33,500 denier) or less, 3,667 tex (33,000 denier) or less, 3,611 tex (32,500 denier) or less, 3,556 tex (32,000 denier) or less, 3,500 tex (31,500 denier) or less, 3,444 tex (31,000 denier) or less, 3,389 tex (30,500 denier) or less, 3,333 tex (30,000 denier) or less, 3,278 tex (29,500 denier) or less, 3,222 tex (29,000 denier) or less, 3,167 tex (28,500 denier) or less, 3,111 tex (28,000 denier) or less, 3,056 tex (27,500 denier) or less, 3,000 tex (27,000 denier) or less, 2,944 tex (26,500 denier) or less, 2,889 tex (26,000 denier) or less, 2,833 tex (25,500 denier) or less, 2,778 tex (25,000 denier) or less, 2,722 tex (24,500 denier) or less, 2,667 tex (24,000 denier) or less, 2,611 tex (23,500 denier) or less, 2,556 tex (23,000 denier) or less, 2,500 tex (22,500 denier) or less, 2,444 tex (22,000 denier) or less, 2,389 tex (21,500 denier) or less, 2,333 tex (21,000 denier) or less, 2,278 tex (20,500 denier) or less, 2,222 tex (20,000 denier) or less, 2,It may be 167 tex (19,500 denier) or less, 2,111 tex (19,000 denier) or less, 2,056 tex (18,500 denier) or less, 2,000 tex (18,000 denier) or less, 1,944 tex (17,500 denier) or less, 1,889 tex (17,000 denier) or less, 1,833 tex (16,500 denier) or less, 1,778 tex (16,000 denier) or less, or 1,722 tex (15,500 denier) or less. If the total fineness is outside the above range, the process for manufacturing a filter for smoking articles may not be good (continuous process is not possible due to cutting), and if the amount of tow filled in the filter paper during manufacturing of a filter for smoking articles is too small or too large, it may be difficult to secure sufficient filter properties (e.g., hardness or suction resistance, etc.).

[0131] The method for measuring fineness is not particularly limited, but for example, take a 2 m sample of the lyocell material to be measured, for example, lyocell tow, and leave it in a room that is kept at a constant temperature and humidity of 20℃ and 65% for 24 hours to stabilize. Fix one end of the stabilized lyocell tow, and attach a weight with a load of 2 kg to the other end. After maintaining the tow in a state of being extended by the load (stabilization) for 5 seconds, cut it into 90 cm to obtain a sample, and measure the weight of the sample (total fineness). The fineness is converted into a denier scale according to the denier conversion method, and the measured weight X 10000. When the total fineness is divided by the number of strands of monofilament in the sample, the single fineness of the monofilament in the sample is calculated.

[0132] The total fineness of the lyocell multifilament as described above can be determined by the single fineness and crimp count of the monofilament. In the present application, the single fineness and crimp count can be controlled, and the total fineness of the lyocell material suitable for manufacturing a filter for a smoking article and ensuring its function can be secured.

[0133] Although not specifically limited, lyocell materials manufactured to satisfy the single fiber and / or total fiber counts described above may be used in smoking articles.

[0134]

[0135] [Crimp]

[0136] 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 lower limit of 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, 19.69 ea / cm (50 ea / inch) or more, or 21.65 ea / cm (55 ea / inch) or more, and the upper limit may be, for example, 17.72 ea / cm (45 ea / inch) or less, 15.75 ea / cm (40 ea / inch) or less, It may be 13.78 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.

[0137] Additionally, in some embodiments, the coefficient of variation of the crimp count (or "first coefficient of variation") may be less than or equal to 50%, and the coefficient of variation of the crimp count may be greater than or equal to 0%. Preferably, the upper limit of the first coefficient of variation may be 50%, 45%, 40%, 35%, 30%, 25%, 20%, or 15%, and the lower limit of the first coefficient of variation may be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 45%. A lyocell material satisfying the above-described numerical ranges is expected to have a uniform crimp count throughout the lyocell material.

[0138] Additionally, the first coefficient of variation may be a value calculated according to Equation 1 below.

[0139] [Formula 1]

[0140] Coefficient of variation of crimp count (%) = [(standard deviation of crimp count) / (mean of crimp count)] * 100

[0141] In Equation 1, the average number of crimps and the standard deviation of the number of crimps may be values ​​calculated for two or more monofilaments included in the lyocell material. Preferably, the average number of crimps and the standard deviation of the number of crimps may be values ​​calculated for 50 or more monofilaments included in the lyocell material.

[0142] Additionally, monofilaments may be randomly dismantled from the lyocell material for calculation according to Equation 1. By calculating the first coefficient of variation according to Equation 1 from the randomly dismantled monofilaments, the first coefficient of variation can provide information on the uniformity of the crimp imparted to the lyocell material, and preferably, information related to the number of crimps.

[0143] In particular, the coefficient of variation of the number of crimps may be a value calculated according to Equation 1-1.

[0144] [Formula 1-1]

[0145] Coefficient of variation of crimp count (%) = [(Standard deviation of crimp count of central and edge filaments) / (Average of crimp count of central and edge filaments)] * 100

[0146] In Equation 1-1, for an imaginary first line that is parallel to the longitudinal direction of the lyocell material and passes through the center point of the lyocell material, an imaginary second line that is parallel to the first line and passes through one end of the lyocell material, and an imaginary third line that is parallel to the second line and passes through the other end of the lyocell material, a central filament refers to a monofilament that is located closer to the first line than to the second or third line, and an edge filament refers to a monofilament that is located closer to the second or third line than to the first line.

[0147] Preferably, in Equation 1-1, the average number of crimps and the standard deviation of the number of crimps may be values ​​calculated for 50 or more central filaments and 50 or more peripheral filaments included in the lyocell material.

[0148] More preferably, the average number of crimps and the standard deviation of the number of crimps in Equation 1-1 may be values ​​calculated for 100 or more central filaments and 200 or more peripheral filaments. In addition, some (e.g., 50 strands) and other portions (e.g., the remaining 50 strands) of the 100 central filaments may be sampled from locations equidistant from the first line, respectively. Similarly, some (e.g., 100 strands) and other portions (e.g., the remaining 100 strands) of the 200 peripheral filaments may be sampled from locations equidistant from the second line and the third line, respectively. In particular, 50 of the 100 edge filaments can be collected closer to the second line than the remaining 50 strands, and 50 of the 100 edge filaments can be collected closer to the third line than the remaining 50 strands.

[0149] For example, when the x-coordinate of the second line is 0, the x-coordinate of the first line is 50, and the x-coordinate of the third line is 100, the central filament can be sampled at points where the x-coordinate is 40 and / or 60, and the edge filament can be sampled at points where the x-coordinate is 5, 20, 80, and / or 95.

[0150] Additionally, for the calculation of Equation 1-1, monofilaments may be randomly released from the central portion and the edge portion of the lyocell material, respectively. By calculating the first coefficient of variation using monofilaments randomly released from the central portion and the edge portion, the first coefficient of variation can provide information on the uniformity of crimps imparted to the central portion and the edge portion of the lyocell material, and preferably, can provide information related to the number of crimps.

[0151] The number of crimps and the coefficient of variation of the crimp count can be measured using a material property evaluation device. Textechno's FAVIMAT+ can be considered as an example of a material property evaluation device, although it is not particularly limited. When using the material property evaluation device, a dedicated jig can be used, and a sample (preferably monofilament) collected from lyocell material is mounted on the dedicated jig and evaluated by the material property evaluation device. The sample can be mounted on the dedicated jig with a gauge length of 10 to 30 mm.

[0152] Although not particularly limited, an initial load may be applied to the monofilament to enable a smooth property evaluation. For example, the initial load may be 0.009 N / tex (0.1 g / d), 0.0066 N / tex (0.075 g / d), 0.0044 N / tex (0.05 g / d), 0.0022 N / tex (0.025 g / d), or 0.0009 N / tex (0.01 g / d). In addition, evaluation conditions for the number of crimps may be set. As examples of the evaluation conditions, crimp sensitivity and loading speed may be considered. In general, as the crimp sensitivity and loading speed are set to be smaller, the number of crimps measured may increase. For example, the crimp sensitivity may be set to 0.03 mm, 0.02 mm, 0.01 mm, or 0.005 mm. The loading speed can be set to 20 mm / min, 15 mm / min, 10 mm / min or 5 mm / min.

[0153] Although not specifically limited, prior to measuring the crimp count and the first coefficient of variation, stabilization of the lyocell material and / or monofilament may be performed. Stabilization may be performed under constant temperature and constant humidity conditions. For example, the constant temperature conditions may be a temperature of 20±2°C, and the constant humidity conditions may be a humidity of 65±4%RH. Additionally, stabilization may be performed for 24 hours or more.

[0154] Although not specifically limited, lyocell materials manufactured to meet the above-described crimp count and / or coefficient of variation of crimp count may be used in smoking articles.

[0155]

[0156] [tensile strength]

[0157] In some embodiments, the tensile strength may be from 0.026 N / tex to 0.106 N / tex (0.30 gf / d to 1.2 gf / d). Preferably, the upper limit of the tensile strength may be 0.097 N / tex (1.1 gf / d), 0.088 N / tex (1.0 gf / d), 0.0794 N / tex (0.9 gf / d), 0.0706 N / tex (0.8 gf / d), 0.0618 N / tex (0.7 gf / d), or 0.0530 N / tex (0.6 gf / d), and the lower limit of the tensile strength may be 0.0265 N / tex (0.30 gf / d), 0.0353 N / tex (0.40 gf / d), 0.0397 N / tex (0.45 gf / d), 0.0441 N / tex (0.5 gf / d), or 0.0485 N / tex (0.55 gf / d).

[0158] In some embodiments, the coefficient of variation of the tensile strength of the lyocell material (or "second coefficient of variation") can be less than or equal to 70% and greater than or equal to 30%. Preferably, the upper limit of the second coefficient of variation can be 60%, 50%, 45%, 40%, 35%, 30%, or 25%, and the lower limit of the second coefficient of variation can be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 45%. A lyocell material satisfying the above-described numerical ranges is expected to have a uniform tensile strength throughout the lyocell material.

[0159] Additionally, the second coefficient of variation may be a value calculated according to Equation 2.

[0160] [Formula 2]

[0161] Coefficient of variation of tensile strength (%) = [(standard deviation of tensile strength) / (mean of tensile strength)] * 100

[0162] In Equation 2, the average tensile strength and the standard deviation of the tensile strength are values ​​calculated for two or more monofilaments included in the lyocell material. Preferably, the average tensile strength and the standard deviation of the tensile strength may be values ​​calculated for 50 or more monofilaments included in the lyocell material.

[0163] Additionally, monofilaments may be randomly dismantled from the lyocell material for calculation according to Equation 2. By calculating the second coefficient of variation from the randomly dismantled monofilaments according to Equation 2, the second coefficient of variation can provide information on the tensile strength of the lyocell material, and preferably, information related to the uniformity of the tensile strength.

[0164] In particular, the second coefficient of variation may be a value calculated according to Equation 2-1.

[0165] [Formula 2-1]

[0166] Coefficient of variation of tensile strength (%) = [(Standard deviation of tensile strength of central and edge filaments) / (Average of tensile strength of central and edge filaments)] * 100

[0167] In Equation 2-1, for an imaginary first line that is parallel to the longitudinal direction of the lyocell material and passes through the center point of the lyocell material, an imaginary second line that is parallel to the first line and passes through one end of the lyocell material, and an imaginary third line that is parallel to the second line and passes through the other end of the lyocell material, a central filament refers to a monofilament that is located closer to the first line than to the second or third line, and an edge filament refers to a monofilament that is located closer to the second or third line than to the first line.

[0168] In some embodiments, the mean of tensile strength and the standard deviation of tensile strength in Equation 2-1 may be values ​​calculated for 50 or more central filaments and 50 or more peripheral filaments included in the lyocell material.

[0169] More preferably, the mean of tensile strength and the standard deviation of tensile strength in Equation 2-1 may be values ​​calculated for 100 or more central filaments and 200 or more peripheral filaments. In addition, some (e.g., 50 strands) and other portions (e.g., the remaining 50 strands) of the 100 central filaments may be collected from locations equidistant from the first line, respectively. Similarly, some (e.g., 100 strands) and other portions (e.g., the remaining 100 strands) of the 200 peripheral filaments may be collected from locations equidistant from the second line and the third line, respectively. In particular, 50 of the 100 edge filaments can be collected closer to the second line than the remaining 50 strands, and 50 of the 100 edge filaments can be collected closer to the third line than the remaining 50 strands.

[0170] For example, when the x-coordinate of the second line is 0, the x-coordinate of the first line is 50, and the x-coordinate of the third line is 100, the central filament can be sampled at points where the x-coordinate is 40 and / or 60, and the edge filament can be sampled at points where the x-coordinate is 5, 20, 80, and / or 95.

[0171] In addition, for the calculation of Equation 2-1, monofilaments may be randomly released from the central portion and the edge portion of the lyocell material, respectively. By calculating the second coefficient of variation using the monofilaments randomly released from the central portion and the edge portion, the second coefficient of variation can provide information on the tensile strength of the monofilaments included in the central portion and the edge portion of the lyocell material, and preferably, can provide information related to the uniformity between the tensile strength of the monofilaments included in the central portion and the tensile strength of the monofilaments included in the edge portion.

[0172] The tensile strength and second coefficient of variation of lyocell materials can be measured using a property evaluation device. Textechno's FAVIMAT+ can be considered as an example of a property evaluation device, although this is not particularly limited. When using the property evaluation device, a dedicated jig can be used, and a sample (preferably monofilament) collected from the lyocell material is mounted on the dedicated jig and evaluated using the property evaluation device. The sample can be mounted on the dedicated jig with a gauge length of 10 to 30 mm.

[0173] Additionally, for measuring tensile strength, the sample may be stretched at a constant stretching rate. For example, the stretching rate may be 100 mm / min, 90 mm / min, 80 mm / min, 70 mm / min, 60 mm / min, 50 mm / min, 40 mm / min, 30 mm / min, 20 mm / min, or 10 mm / min, and preferably 20 mm / min.

[0174] Additionally, the lyocell material and / or monofilament may be stabilized under constant temperature and humidity conditions prior to measuring the tensile strength and second coefficient of variation. For example, the constant temperature conditions may be a temperature of 20±2°C, and the constant humidity conditions may be a humidity of 65±4%RH. Additionally, the stabilization may be performed for 24 hours or more.

[0175] Although not specifically limited, lyocell materials manufactured to meet the above-described tensile strength and / or coefficient of variation of tensile strength may be used in smoking articles.

[0176]

[0177] [Amputated believer]

[0178] In some embodiments, the elongation at break can be from 2.0% to 10.0%. Preferably, the upper limit of the elongation at break can be 9.5%, 9.0%, 8.5%, 8.0% 7.5%, 7.0%, 6.5%, 6.0%, 5.5%, 5.0%, 4.5%, 4.0%, 3.5%, or 3.0%, and the lower limit of the elongation at break can be 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%.

[0179] In some embodiments, the coefficient of variation of the breaking elongation (or "third coefficient of variation") may be less than or equal to 50% and greater than or equal to 20%. The upper limit of the third coefficient of variation may be 45%, 40%, 35%, 30%, or 25%, and the lower limit of the first coefficient of variation may be 0%, 5%, 10%, or 15%. A lyocell material satisfying the above-described numerical ranges is expected to have a uniform breaking elongation throughout the lyocell material.

[0180] Additionally, the third coefficient of variation may be a value calculated according to Equation 3.

[0181] [Formula 3]

[0182] Coefficient of variation of breaking elongation (%) = [(standard deviation of breaking elongation) / (mean of breaking elongation)] * 100

[0183] In Equation 3, the average breaking elongation and the standard deviation of the breaking elongation are values ​​calculated for two or more monofilaments included in the lyocell material. Preferably, the average breaking elongation and the standard deviation of the breaking elongation may be values ​​calculated for 50 or more monofilaments included in the lyocell material.

[0184] Additionally, monofilaments may be randomly dismantled from the lyocell material for calculation according to Equation 3. By calculating the third coefficient of variation from the randomly dismantled monofilaments according to Equation 3, the third coefficient of variation can provide information on the breaking elongation of the lyocell material, and preferably, information related to the uniformity of the breaking elongation.

[0185] In particular, the coefficient of variation of the cutting elongation may be a value calculated according to Equation 3-1.

[0186] [Formula 3-1]

[0187] Coefficient of variation of breaking elongation (%) = [(Standard deviation of breaking elongation of central and edge filaments) / (Average of breaking elongation of central and edge filaments)] * 100

[0188] In Equation 3-1, for an imaginary first line that is parallel to the longitudinal direction of the lyocell material and passes through the center point of the lyocell material, an imaginary second line that is parallel to the first line and passes through one end of the lyocell material, and an imaginary third line that is parallel to the second line and passes through the other end of the lyocell material, a central filament refers to a monofilament that is located closer to the first line than to the second or third line, and an edge filament refers to a monofilament that is located closer to the second or third line than to the first line.

[0189] In some embodiments, in Equation 3-1, the mean breaking elongation and the standard deviation of the breaking elongation may be values ​​calculated for 50 or more central filaments and 50 or more peripheral filaments included in the lyocell material.

[0190] More preferably, the mean of the breaking elongation and the standard deviation of the breaking elongation in Equation 3-1 may be values ​​calculated for 100 or more central filaments and 200 or more peripheral filaments. In addition, some (e.g., 50 strands) and other portions (e.g., the remaining 50 strands) of the 100 central filaments may be sampled from locations equidistant from the first line, respectively. Similarly, some (e.g., 100 strands) and other portions (e.g., the remaining 100 strands) of the 200 peripheral filaments may be sampled from locations equidistant from the second line and the third line, respectively. In particular, 50 of the 100 edge filaments can be collected closer to the second line than the remaining 50 strands, and 50 of the 100 edge filaments can be collected closer to the third line than the remaining 50 strands.

[0191] For example, when the x-coordinate of the second line is 0, the x-coordinate of the first line is 50, and the x-coordinate of the third line is 100, the central filament can be sampled at points where the x-coordinate is 40 and / or 60, and the edge filament can be sampled at points where the x-coordinate is 5, 20, 80, and / or 95.

[0192] In addition, for the calculation of Equation 3-1, monofilaments may be randomly disentangled from the center and edge portions of the lyocell material, respectively. By calculating the third coefficient of variation using the monofilaments randomly disentangled from the center and edge portions, the third coefficient of variation can provide information on the breaking elongation of the monofilaments included in the center and edge portions of the lyocell material, and preferably, can provide information related to the uniformity between the breaking elongation of the monofilaments included in the center and the breaking elongation of the monofilaments included in the edge portions.

[0193] The breaking elongation and third coefficient of variation of lyocell materials can be measured using a material property evaluation device. Textechno's FAVIMAT+ can be considered as an example of a material property evaluation device, although this is not particularly limited. When using the material property evaluation device, a dedicated jig can be used, and a sample (preferably monofilament) collected from the lyocell material can be mounted on the dedicated jig and evaluated using the material property evaluation device. The sample can be mounted on the dedicated jig with a gauge length of 10 to 30 mm.

[0194] Additionally, for the measurement of breaking elongation, the sample may be stretched at a constant tensile rate. For example, the tensile rate may be 100 mm / min, 90 mm / min, 80 mm / min, 70 mm / min, 60 mm / min, 50 mm / min, 40 mm / min, 30 mm / min, 20 mm / min, or 10 mm / min, and preferably 20 mm / min.

[0195] Additionally, the lyocell material and / or monofilament may be stabilized under constant temperature and humidity conditions prior to measuring the breaking elongation and third coefficient of variation. For example, the constant temperature conditions may be a temperature of 20±2°C, and the constant humidity conditions may be a humidity of 65±4%RH. Additionally, the stabilization may be performed for 24 hours or more.

[0196] Although not specifically limited, lyocell materials manufactured to meet the above-described breaking elongation and / or coefficient of variation of breaking elongation may be used in smoking articles.

[0197]

[0198] [bookbinder]

[0199] In one non-limiting example, the lyocell material may further comprise a binder. The binder may be present, for example, on the surface of the lyocell multifilaments or between the lyocell multifilaments (or monofilaments). The binder may increase the hardness of the filter for a smoking article, thereby preventing problems such as filter jamming during the filter manufacturing process or the manufacturing process of a smoking article (e.g., cigarette).

[0200] 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.

[0201] In one non-limiting example, the binder may include a polyester-based binder, a cellulosic-based binder, and / or a vinyl-based binder.

[0202] 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.

[0203] 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.

[0204] In some embodiments, the cellulosic binder is selected from the group consisting of hydroxypropylmethylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and combinations thereof.

[0205] 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).

[0206] In some embodiments, the vinyl binder is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and combinations thereof.

[0207] The method of applying (coating) the above binder to the lyocell material is described below.

[0208]

[0209] [emulsion]

[0210] 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.

[0211] The emulsion comprising at least the above components (a) and (b) may have hydrophobic properties. As a result, the lyocell material treated with the emulsion has excellent spreading properties.

[0212] In a specific example of the present application, the lyocell material may contain a predetermined amount of the emulsion. In this case, the amount of the emulsion may refer to OPU (wt%), which will be described later. OPU may refer to "oil pick-up ratio." For example, the lyocell material may contain the emulsion in an amount of 0.1 wt% or more, based on 100 wt% of the total lyocell material. Specifically, the content of the emulsion may be 0.5 wt% or more, 1.0 wt% or more, 1.5 wt% or more, 2.0 wt% or more, 2.5 wt% or more, 3.0 wt% or more, specifically 3.5 wt% or more, 4.0 wt% or more, 4.2 wt% or more, 4.5 wt% or more, 5.0 wt% or more, 5.5 wt% or more, 6.0 wt% or more, 6.5 wt% or more, 7.0 wt% or more, 7.5 wt% or more, 8.0 wt% or more, 8.5 wt% or more, 9.0 wt% or more, or 9.5 wt% or more. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less.

[0213] As a method for measuring the content (OPU) of the above-mentioned emulsion, for example, an extrusion method can be used. For example, a sample (e.g., 2 to 5 g, specifically, about 2.5 g) is collected (the weight of the collected sample is referred to as the sample weight) and the sample is placed in a syringe-shaped container. The material of the container is not particularly limited, but may be SUS (stainless steel). Next, a solvent (e.g., methanol) is placed in the container into which the sample has been placed (the amount of the solvent placed may be 10 ml or less (e.g., about 8 ml)). The solvent may be placed in a dropping manner when the sample is placed, and the dropping speed is controlled uniformly. Then, the solvent placed in the container as described above is allowed to fall from one end of the syringe-shaped container onto a plate. At this time, the plate is pre-weighed (the weighed weight is referred to as plate weight A), and the plate is installed so that the solvent dropped on the plate can fly away (i.e., evaporate) at a temperature of 120 to 130°C (e.g., 125°C). The above-described solvent injection and solvent dropping are performed three times, and a pressure (e.g., 98 N / cm) is applied to the sample using a syringe-shaped container. 2 (10 kgf / cm 2 ) or less, 49 N / cm 2 (5 kgf / cm 2 ) or less or 18-39 N / cm 2 (2-4 kgf / cm 2 )) and press the sample once. This sufficiently extrudes the solvent and emulsion present in the sample. Squeeze the sample by applying pressure until no solvent comes out. Afterwards, store the plate in a desiccator for 5 to 10 minutes, and measure the weight of the plate containing the sample (plate weight B). Then, calculate the emulsion content according to the formula below.

[0214] Food

[0215] Content of emulsion by extrusion (OPU, % or wt%)

[0216] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0217] 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.

[0218] In relation to the emulsion of the present application, component (a) is a compound that can function as a type of lubricant or oil, and may be a component harmless to the human body enough to be used in food. Component (a) provides lubrication to the fibers fed into the crimper. If the lubrication is insufficient, the lyocell may clump together and not be able to escape the crimper. If the lubrication is excessively high, the crimp may not be formed properly. The content of component (a) can be controlled, as described below, taking these functions into account.

[0219] 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.

[0220] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0221] 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.

[0222] 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.

[0223] 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, arachidonic acid and combinations thereof.

[0224] 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.

[0225] With respect to the above component (a), the type of aliphatic monohydric alcohol forming it is not particularly limited. Any aliphatic monohydric alcohol capable of providing an ester compound that is harmless to the human body and suitable for use in food may be used.

[0226] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and they can have a linear or branched form.

[0227] For example, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. Specifically, the carbon number of the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0228] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0229] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol, stearyl alcohol, and combinations thereof.

[0230] In a specific example of the present application, an ester of isotridecanol and stearic acid (e.g., isotridecyl stearate) may be used as the component (a). However, the type of component (a) that can be used is not limited thereto.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] With respect to the above component (b), the type of fatty acid having 16 or more carbon atoms forming it is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an ester compound that is harmless to the human body and can be used in food may be used.

[0235] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0236] 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.

[0237] 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.

[0238] 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, arachidonic acid and combinations thereof.

[0239] 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.

[0240] In a specific example of the present application, the component (b) may be an ester of sorbitan and oleic acid (e.g., sorbitan monooleate). However, the types of usable component (b) are not limited thereto.

[0241] (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.

[0242] 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.

[0243] Specifically, the emulsion of the present application may contain the component (b) in an amount of 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, or 50 parts by weight or more, relative to 100 parts by weight of the component (a). In addition, the upper limit of the content of the component (b) relative to 100 parts by weight of the component (a) may be, for example, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, or 25 parts by weight or less. When the above content range is satisfied, the surface of the emulsion-treated lyocell multifilament or lyocell tow may have hydrophobicity.

[0244] 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. Specifically, the content of the (a) component may be 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, 65 wt% or more, 70 wt% or more, or 75 wt% or more, based on 100 wt% of the total weight of the emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0245] For example, the emulsion may contain an excess amount of component (a).

[0246] 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. Specifically, the content of the (b) component may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, based on 100 wt% of the total weight of the emulsion. And the upper limit of the content may be, for example, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, or 25 wt% or less.

[0247] For example, the emulsion may further contain water. A small amount of water may aid in emulsification.

[0248] 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.

[0249]

[0250] [Method for manufacturing lyocell material]

[0251] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0252] Specifically, the method for manufacturing the lyocell material includes a lyocell dope spinning step; a coagulation and multifilament obtaining step; a washing step; an emulsion treatment step; and a crimping step. In addition, the method for manufacturing the lyocell material may further include a binder treatment step; and other steps. In some embodiments, the steps are performed in the mentioned order.

[0253] The emulsion treatment step may be performed before the crimping step, after the crimping step, or before and after the crimping step.

[0254] 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.

[0255] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0256] 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.

[0257]

[0258] <(a) Lyocell dope radiation stage>

[0259] This step is a step of spinning a lyocell spinning dope containing lyocell cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0260] 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.

[0261] 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 dope. If the content of cellulose is too low, it is difficult to implement the characteristics of the lyocell fiber, and if the content exceeds the above range, it is difficult to dissolve in a solvent. Considering this, the content of cellulose in the spinning dope may be 6 wt% or more, 7 wt% or more, 8 wt% or more, 9 wt% or more, or 10 wt% or more, based on 100 wt% of the total weight of the 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 dope. The term “cellulose” may refer to “lyocell cellulose.”

[0262] 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.

[0263] 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.

[0264] For example, the cellulose or cellulose pulp may have a hemicellulose content of 3 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.

[0265] Additionally, in a specific example of the present application, the degree of polymerization (DPw) of the cellulose may be 600 to 1700.

[0266] In some embodiments, the degree of polymerization of the cellulose refers to the number of repeating units and / or monomers of the cellulose, alpha-cellulose and / or hemicellulose within the cellulose or cellulose pulp.

[0267] 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.

[0268] 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.

[0269] For example, the step of spinning the above-described spinning dope can be performed under controlled spinning conditions so that the single filament fineness can be 1.67 dtex to 8.89 dtex (1.5 denier to 8.0 denier) or less. For example, one or more spinning conditions among the discharge amount and spinning speed of the above-described spinning dope can be appropriately controlled so that the single filament fineness included in the lyocell material can satisfy 1.67 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.

[0270] 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.

[0271] The radiation dope discharged through the radiation detention can go through the coagulation step described below.

[0272]

[0273] <(b) Coagulation and multifilament production step>

[0274] In this step, the radiated lyocell radiant dope is coagulated, and lyocell multifilament can be obtained.

[0275] The above coagulation may be carried out in a manner in which the radiation dope comes into contact with air and / or a coagulating liquid.

[0276] 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.

[0277] 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.

[0278] 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 coagulation of the radiation dope by the air may not be sufficient, and the radiation-related processability may not be good.

[0279] 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.

[0280] The degree to which the cooling air is supplied can be controlled taking into account sufficient coagulation, spinning processability, and the influence on the physical properties of the filament. For example, 70 to 400 Nm 3 / h can be supplied to the radiation dope derived from the air volume. More particularly, 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.

[0281] 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.

[0282] 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).

[0283] 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.

[0284]

[0285] <(c) Washing stage>

[0286] If necessary, the lyocell multifilaments may be washed after the coagulation and multifilament steps described above. This washing may remove any remaining NMMO and / or other impurities within the filaments.

[0287] 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.

[0288] The components of the washing liquid are not particularly limited. For example, the washing liquid may contain water and may also contain known additives.

[0289] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0290]

[0291] <(d) Milk processing stage>

[0292] 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.

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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 weight of the emulsion-treated lyocell multifilament. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on at least 100 wt% of the 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.

[0297] 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.

[0298] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0299] In a specific example of the present application, one or more of the steps described above can be controlled so that the single filament fineness of the filament forming the lyocell multifilament can be 1.67 to 8.89 dtex (1.5 to 8.0 denier). The single filament fineness refers to the fineness of one single monofilament separated from the multifilament.

[0300] 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.

[0301] 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.

[0302]

[0303] <(e) Crimp application step>

[0304] The crimping step is a step in which pressure is applied to the emulsion-treated lyocell multifilament through steam and / or a press roller to obtain a crimped multifilament, preferably a crimped tow. The crimping step may be referred to as a crimping step. In the present specification, the terms “emulsion-treated” and “emulsified” may be used interchangeably.

[0305] Crimping imparts waves to the lyocell multifilament, giving the fibers bulky properties. Crimping can be performed using any known crimping device, such as a stuffer box and / or a steam box. The usable crimping device is not particularly limited, as long as it can apply one or more of the pressures described below.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] 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 inserting it into the crimping device (specifically, the press roller). 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying steam.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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.

[0314] The pressure of the press roller is within the above range. If the pressure is less than the above range, the desired number of crimps may not be sufficiently formed. Furthermore, if the roller pressure exceeds the above range, the pressing force may be too strong, preventing the filament from being smoothly fed into the crimping device or from passing through the crimping device. Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0315] 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.

[0316] 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.

[0317] 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 is not fixed due to the pressure inside the crimp device, so the tow remains in the crimp device for a long time, and the continuity of the process is not maintained. 19.61 N / cm 2 If it exceeds (2 kgf / ㎠), the steam may not be discharged smoothly inside the crimp device, which may result in an irregular crimp shape.

[0318] In an exemplary method for manufacturing a lyocell material, the crimping step is performed by a crimping device including one or more side plates, and the surface roughness (Ra) of the side plates 1 ) may be less than 1000 nm or greater than 100 nm.

[0319] Preferably, surface roughness (Ra) 1 ) may be 950 nm, 900 nm, 850 nm, 800 nm, 750 nm, 700 nm, 650 nm, 600 nm, 550 nm, 500 nm, 450 nm, 400 nm, 350 nm, or 300 nm, and its lower limit may be 100 nm, 125 nm, 150 nm, 175 nm, 200 nm, 225 nm, or 250 nm.

[0320] If the surface roughness of the side plate exceeds 1000 nm, the side plate may cause excessive physical deformation of the lyocell multifilament in contact with the side plate. As a result, at least a portion of the lyocell multifilament may be damaged or its properties may be degraded.

[0321] Conversely, if the surface roughness of the side plate is less than 100 nm, the contact area between the side plate and the lyocell multifilament may increase excessively. As a result, excessive frictional force may occur between the side plate and the lyocell multifilament. As a result, the area of ​​the lyocell multifilament subject to physical deformation may be excessive, and the uniformity of the lyocell multifilament may be reduced and its properties may be degraded.

[0322] In particular, during the process of imparting crimp to the lyocell multifilament, at least a portion of the lyocell multifilament may contact the surface of the side plate. In particular, at least a portion of the edge filaments included in the lyocell multifilament may contact the surface of the side plate. The definition of the edge filaments is as described above.

[0323] Since the side plate and at least a portion of the lyocell multifilaments come into contact, a frictional force is generated between the side plate and the lyocell multifilaments during the crimping step. In addition, at least a portion of the lyocell multifilaments is physically deformed due to the frictional force.

[0324] As a result, differences may occur between the portion deformed by the frictional force and the portion not deformed by the frictional force. In particular, differences may occur between the edge filaments and the portion excluding the edge filaments. In particular, differences may occur between the edge filaments and the central filaments. For example, the edge filaments and the central filaments may have different crimp counts, different tensile strengths, and / or different breaking elongations.

[0325] If the frictional force generated between the side plate and the lyocell multifilament is excessive, an excessive difference may occur between a portion deformed by the frictional force and a portion not deformed by the frictional force. For example, the number of crimps of the edge filaments and the number of crimps of the central filaments may be excessively different, the tensile strength of the edge filaments and the tensile strength of the central filaments may be excessively different, and the breaking elongation of the edge filaments and the breaking elongation of the central filaments may be excessively different. As a result, the properties (e.g., filterability, etc.) of the lyocell material including both may be deteriorated due to the difference between the edge filaments and the central filaments.

[0326] In an exemplary method for manufacturing a lyocell material, when the crimp device includes two or more side plates, the surface roughness of the two or more side plates may be independently 1000 nm or less and 100 nm or more.

[0327] As described above, by adjusting the surface roughness of the side plate to satisfy a predetermined range, the exemplary lyocell material can have a first coefficient of variation of 10% to 50%, a second coefficient of variation of 30% to 70%, and a third coefficient of variation of 20% to 50%. A person skilled in the art can understand that the exemplary lyocell material has improved uniformity compared to a conventional lyocell material based on the fact that the first coefficient of variation, the second coefficient of variation, and the third coefficient of variation satisfy the above-described ranges. Furthermore, based on the improved uniformity of the lyocell material, a person skilled in the art can understand that a filter for a smoking article including the lyocell material can provide improved filtering performance.

[0328] For example, the crimping step may employ a blade that applies a predetermined pressure to the lyocell multifilament. The blade controls the residence time of the filaments introduced into the crimping device, thereby contributing to the control of the number of crimps. Such a 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. Preferably, the blade may be a doctor blade.

[0329] For example, the crimping step may be performed by applying a pressure of 0.98 to 19.61 N / cm to the lyocell multifilaments passing through the rollers of the crimping device using one or more blades (doctors). 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying pressure.

[0330] For example, the pressure exerted by the 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 blade.

[0331] In an exemplary method for manufacturing lyocell material, the surface roughness (Ra) of the blade 2 ) may be less than 1200 nm. Preferably, the surface roughness (Ra 2 ) may be 1150 nm or less, 1100 nm or less, 1050 nm or less, 1100 nm or less, 950 nm or less, 900 nm or less, 850 nm or less, 800 nm or less, 750 nm or less, 700 nm or less, 650 nm or less, 600 nm or less, 550 nm or less, 500 nm or less, or 450 nm or less.

[0332] When the surface roughness of the blade is 1200 nm or more, excessive physical deformation may occur in the lyocell multifilaments that come into contact with the blade during the transport process of the lyocell multifilaments. As a result, at least a portion of the lyocell multifilaments may be damaged or their properties may deteriorate.

[0333] In an exemplary method for manufacturing a lyocell material, the crimp device includes a first blade and a second blade, the first blade and the second blade are spaced apart from each other, and the surface roughness of the first blade and the surface roughness of the second blade can be less than 1200 nm, independently of each other.

[0334] As described above, by adjusting the surface roughness of the first blade and the surface roughness of the second blade to satisfy predetermined ranges, the exemplary lyocell material can have a first coefficient of variation of 10% to 50%, a second coefficient of variation of 30% to 70%, and a third coefficient of variation of 20% to 50%. A person skilled in the art can understand that the exemplary lyocell material has improved uniformity compared to a conventional lyocell material based on the fact that the first coefficient of variation, the second coefficient of variation, and the third coefficient of variation satisfy the above-described ranges. Furthermore, based on the improved uniformity of the lyocell material, a person skilled in the art can understand that a filter for a smoking article including the lyocell material can provide improved filtering performance.

[0335]

[0336] For example, the crimping step may be performed at a temperature ranging from 120 to 250°C. If the temperature is too low, the shape stabilization effect of the crimp is not good, and if the temperature is too high, the concentration of the oil content in the crimping device may increase, making crimp formation difficult. Therefore, considering the steam pressure described above, etc., the temperature may be appropriately controlled in a range of 130°C or higher, 140°C or higher, or 150°C or higher, and 200°C or lower, 180°C or lower, or 160°C or lower.

[0337]

[0338] <(f) Binder processing step>

[0339] 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.

[0340] 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.

[0341] There are no specific limitations on the method for coating the lyocell material with a binder. For example, the emulsion treatment may be performed by immersing the lyocell multifilament in a binder (or binder solution) bath so that the lyocell multifilament is completely submerged in the binder. Alternatively, the binder coating on the lyocell multifilament may be performed by spraying (or spraying) the binder (or binder solution) using a nozzle.

[0342] The types and components of available binders are as described above, so they are omitted.

[0343] For example, the binder (or binder solution) may further include a solvent in addition to the above-described components. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin, for example. When the binder (or binder solution) includes a solvent, the content of the solvent may be, for example, about 20 to 80 wt% or 40 to 60 wt% based on 100 wt% of the total binder (or binder solution).

[0344] 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.

[0345] 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.

[0346]

[0347] <(g) Other steps>

[0348] After crimping, additional appropriate post-processing may be performed.

[0349] For example, a secondary emulsion treatment (g1) may be additionally performed. The secondary emulsion treatment may further impart flexibility to the tow. The secondary emulsion treatment may be performed in the same manner as or in accordance with the emulsion treatment step (d) described above.

[0350] In particular, secondary emulsion treatment can be performed by applying emulsion to lyocell tow that has undergone a crimper process. This can be beneficial for various processes involved in the manufacture of filters for smoking articles. For example, secondary emulsion treatment can not only ensure that the fibers and filter are easily spreadable in air during the spreading process, but also limit fiber breakage during the drawing process.

[0351] 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.

[0352] 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.

[0353] 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 the tow, passing the tow through a temperature-controlled room for a certain period of time, or leaving the tow in such a manner.

[0354]

[0355] In one aspect, the present invention provides a lyocell material obtained by the method for producing a lyocell material as described above.

[0356] In one aspect, the present invention provides a lyocell material obtainable by the method for producing a lyocell material as described above.

[0357]

[0358] [Smoking items]

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] 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.

[0367]

[0368] [Filter for smoking items]

[0369] 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.

[0370] 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.

[0371] In addition, the lyocell material includes the emulsion in an amount of 0.1 wt% or more relative to 100 wt% of the total lyocell material. In addition, the description of the emulsion components and content according to the specific example of the present application is the same as described above.

[0372] For example, the single fiber count of the filaments 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.

[0373] 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 may preferably be lyocell tow. The specific values ​​are the same as those described above.

[0374] For example, the crimped lyocell multifilament may have crimps of 3.94 to 19.69 per centimeter (10 to 50 per inch). The specific values ​​are the same as those described above.

[0375] 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.

[0376] 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).

[0377] In a specific example of the present application, the filter for the smoking article may have a predetermined shape and size.

[0378] For example, the filter may have a rod shape. In particular, the filter for the smoking article may have a cylindrical shape.

[0379] 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.

[0380] In a specific example of the present application, the filter having the above length may have a circular cross-section, and the circumference of the circular cross-section may be 10 to 40 mm. For example, the lower limit of the circumference of the filter may be 15 mm or more, 20 mm or more, 25 mm or more, 30 mm or more, or 35 mm or more, and the upper limit may be 35 mm or less, 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0381] 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.

[0382] 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).

[0383] For example, when a porous paper is used, the paper may have a porosity of 10 to 50,000 CU (Coresta Unit). A Coresta Unit is 1 cm at a pressure difference of 1 kPa. 2 The volume flow rate (cm) of air passing through the substrate sample (i.e., porous paper) 3 min -1) can be defined. In particular, the lower limit of the porosity of the above-mentioned paper may be, for example, 1000 CU or more, 5000 CU or more, 10000 CU or more, 15000 CU or more, 20000 CU or more, 25000 CU or more, 30000 CU or more, 35000 CU or more, 40000 CU or more, or 45000 CU or more, and the upper limit may be, for example, 45000 CU or less, 40000 CU or less, 35000 CU or less, 30000 CU or less, 25000 CU or less, or 20000 CU or less. In a specific example of the present application, the paper may have a porosity within a range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0384] For example, the weight of the above paper is 15 to 60 g / cm 2　 It can be. In particular, the lower limit of the basis weight of the above-mentioned paper is, for example, 20 g / cm 2 Above, 25 g / cm 2 Above, 30 g / cm 2 Above, 35 g / cm 2 Above, 40 g / cm 2 Above, 45 g / cm 2 Above, 50 g / cm 2 or more than 55 g / cm 2 It can be ideal, and the upper limit is, for example, 55 g / cm 2 Below 50 g / cm 2 Below 45 g / cm 2 Below 40 g / cm 2 Below 35 g / cm 2 Below 30 g / cm 2 Below 25 g / cm 2 Less than or equal to 20 g / cm 2 It may be less than or equal to 16 g / cm. In a specific example of the present application, the paper has a thickness of 16 g / cm. 2 Above, 17 g / cm 2 Above, 18 g / cm 2 Above, 19 g / cm2 Above, 20 g / cm 2 or more than 21 g / cm 2 Above, and 25 g / cm 2 Below, 24 g / cm 2 Below, 23 g / cm 2 Below, 22 g / cm 2 Less than or equal to 21 g / cm 2 It can have the following weights:

[0385] 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.

[0386] Descriptions of other filters for smoking articles and materials included therein are the same as those described above, so they are omitted.

[0387]

[0388] [Method for manufacturing filters for smoking articles]

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] Preferably, the lyocell material used in the manufacture of filters for smoking articles may be lyocell tow.

[0394] 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.

[0395]

[0396] 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 with improved uniformity and a filter for a smoking article comprising the same are provided, thereby improving performance (e.g., filterability).

[0397]

[0398] 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.

[0399]

[0400] 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.

[0401]

[0402] [Manufacturing example]

[0403] 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 tow having a concentration of 11 wt%. 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.

[0404] The filament-phase spinning dope discharged from the spinneret was supplied to the coagulation liquid (the coagulation liquid having a concentration of 75 wt% water and 25 wt% NMMO based on 100% of the total weight of the coagulation liquid, and having a temperature of approximately 25°C) in the coagulation 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 100 N㎥ / h. In addition, the concentration of the coagulation liquid was continuously monitored using a sensor and a refractometer.

[0405] Then, the coagulated lyocell filament was washed. Specifically, the filament was introduced into a traction roller, and the NMMO remaining in the filament was removed with a washing solution sprayed from a washing device. Then, the washed filament was immersed in a bath designed to have a predetermined emulsion concentration.

[0406] The filament is fed to a nip roll installed in the bath discharge section at 19.61 N / cm 2 (2 kgf / cm2) pressure and fed into a crimp machine for crimping. The crimp machine included a side plate, a first blade, and a second blade. The first blade and the second blade were spaced apart from each other and parallel to each other. In particular, the pressure of the press roller was set to 14.71 to 39.23 N / cm2 (1.5 to 4.5 kgf / cm2), and the pressure of the first blade and the second blade were set to 4.90 N / cm2 (0.5 kgf / cm2) each to manufacture the tow.

[0407] 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.

[0408]

[0409] The manufactured tow has a single fiber count of 2.22 to 4.44 dtex (2.0 to 4.0 denier), a total fiber count of 3,333 to 5,000 tex (30,000 to 45,000 denier), and a crimp count of 9.84 to 15.75 ea / cm (25 to 45 ea / inch).

[0410]

[0411] [Example]

[0412] Examples 1 to 15

[0413] Lyocell material is manufactured according to the manufacturing example, but the roughness (Ra) of the side plate 1 ), roughness (Ra) of the first and second blades 2 ), the pressure of the press roller, and the draft ratio were as shown in Table 1.

[0414]

[0415] Comparative Examples 1 to 6

[0416] Lyocell material is manufactured according to the manufacturing example, but the roughness (Ra) of the side plate 1 ), roughness (Ra) of the first and second blades 2 ), the pressure of the press roller, and the draft ratio were as shown in Table 1.

[0417] The lyocell materials of Comparative Examples 1 to 4 to 6 all had uneven crimping. In particular, under the conditions of Comparative Examples 2 and 3, the production of lyocell materials was impossible, and under the conditions of Comparative Examples 5 and 6, continuous production of lyocell materials was impossible.

[0418]

[0419] Meanwhile, the roughness (Ra) of the side plate 1 ), roughness of the first blade and roughness of the second blade (Ra 2 ) was measured using Bruker's NPFLEX, and the measurement conditions and analysis conditions of the measured values ​​were as follows.

[0420] Measurement conditions: VSI / VXI mode, measurement area 4648 μm x 3486 μm, Backscan / Length 50 μm, Threshold 1%

[0421] Analysis conditions: Gaussian Short Wavelength Cutoff 0.25 mm, n=5 times

[0422]

[0423] Ra 1 (nm)Ra 2 (nm)Pressure of press roller (N / cm²(kgf / cm) 2))Non-example of draft125035027.46 (2.8)1.16225050027.46 (2.8)1.16325065027.46 (2.8)1.16425080027.46 (2.8)1.16525095027.46 (2.8)1.16665035034.33 (3.5)1.19765050034.33 (3.5)1.19865065034.33 (3.5)1.19965080034.33 (3.5)1.101065095034.33 (3.5)1.101165035029.42 (3.0)1.161265050029.42 (3.0)1.161365065029.42 (3.0)1.161465080029.42 (3.0)1.121565095029.42 (3.0)1.12Comparative Example1650120027.46 (2.8)1.1021100120027.46 (2.8)1.1031100120019.61 (2.0)1.05450120029.42 (3.0)1.105110050029.42 (3.0)1.1065065029.42 (3.0)1.10

[0424]

[0425] [Evaluation example]

[0426] Experiment 1: Characteristic Evaluation of Lyocell Materials

[0427] Regarding the properties of the lyocell material manufactured in Examples 1 to 15 and Comparative Examples 1 to 6, the number of crimps, the coefficient of variation of the number of crimps, the tensile strength of the lyocell material, the coefficient of variation of the tensile strength, the breaking elongation of the lyocell material, and the coefficient of variation of the breaking elongation were each measured.

[0428] The number of crimps and the coefficient of variation of the crimp count were measured using the FAVIMAT+, a monofilament property evaluation device. Specifically, monofilaments spooled from lyocell material were mounted on jigs of a predetermined length. The initial load was 0.0044 N / tex (0.05 g / d), and the crimp sensitivity was 0.01 mm.

[0429] Meanwhile, to measure the coefficient of variation of the crimp count, the central and edge filaments were each disassembled. A total of 200 edge filaments were prepared, and a total of 100 central filaments were prepared. In addition, the coefficient of variation of the crimp count was calculated according to Equation 1-1 below. The measurement and calculation results are shown in Table 2 below.

[0430] [Formula 1-1]

[0431] Coefficient of variation of crimp count (%) = [(Standard deviation of crimp count of central and edge filaments) / (Average of crimp count of central and edge filaments)] * 100

[0432] The tensile strength, coefficient of variation of tensile strength, elongation at break, and coefficient of variation of elongation at break of lyocell materials were measured using FAVIMAT+, a material property evaluation device from Textechno. In particular, the tensile speed was 20 mm / min. Prior to measurement, specimens collected from lyocell materials were pre-dried at 110°C for 2 h and then left for more than 24 h under constant temperature and humidity conditions of 20±2°C and 65±4%RH.

[0433] Meanwhile, in order to measure the coefficient of variation of tensile strength and the coefficient of variation of breaking elongation, the central and edge filaments were each dismantled from the above specimen. A total of 200 edge filaments were prepared, and a total of 100 central filaments were prepared. In addition, the coefficient of variation of tensile strength was calculated according to Equation 2-1 below, and the coefficient of variation of breaking elongation was calculated according to Equation 3-1 below. The measurement and calculation results are shown in Table 2 below.

[0434] [Formula 2-1]

[0435] Coefficient of variation of tensile strength (%) = [(Standard deviation of tensile strength of central and edge filaments) / (Average of tensile strength of central and edge filaments)] * 100

[0436] [Formula 3-1]

[0437] Coefficient of variation of breaking elongation (%) = [(Standard deviation of breaking elongation of central and edge filaments) / (Average of breaking elongation of central and edge filaments)] * 100

[0438]

[0439] Number of crimps (ea / cm(ea / inch))Coefficient of variation of number of crimps (%)Tensile strengthN / tex((gf / d))Coefficient of variation of tensile strength (%)Breaking elongation (%)Coefficient of variation of breaking elongation (%)Example 112.60 (32)17.60.054(0.61)35.04.925.8211.81 (30)14.20.071 0.81)33.79.421.1313.39 (34)18.70.047(0.53)32.47.321.5411.81 (30)15.30.050(0.57)38.35.725.7514.96 (38)11.20.065(0.74)39.29.622.0613.78 (35)17.80.084(0.95)41.92.923.5713.78 (35)16.30.063(0.71)47.96.226.6813.39 (34)22.80.074(0.84)45.65.530.1912.99 (33)13.40.076(0.86)42.28.820.51016.54 (42)22.30.056(0.64)43.54.328.21111.02 (28)17.00.049(0.56)38.45.724.21211.81 (30)18.20.073(0.83)39.48.824.31313.78 (35)20.40.069(0.78)34.35.927.81416.14 (41)15.90.086(0.98)36.74.624.21513.39 (34)11.30.057(0.65)45.74.221.9Comparative Example 114.17 (36)65.50.029(0.33)63.24.666.42------3------412.60 (32)61.20.023(0.26)71.24.971.5515.35 (39)56.00.021(0.24)58.23.275.2614.57 (37)52.00.026(0.29)69.33.071.3

[0440]

[0441] Referring to Table 2, it was found that the lyocell materials of Examples 1 to 15 all had a low coefficient of variation of crimp count, a low coefficient of variation of tensile strength, and a low coefficient of variation of breaking elongation.

[0442] Therefore, it was confirmed that the central filaments and edge filaments included in the lyocell materials of Examples 1 to 15 had relatively uniform crimp counts, tensile strengths, and breaking elongations. Furthermore, due to the uniformity of the central filaments and edge filaments, the lyocell materials of Examples 1 to 15 are expected to provide consistent quality (e.g., filterability) as filters for smoking articles.

[0443] On the other hand, it was confirmed that the lyocell materials of Comparative Examples 1 and 4 had very large deviations in the number of crimps, tensile strength, and breaking elongation, to the extent that the coefficient of variation of the number of crimps, the coefficient of variation of the tensile strength, and the coefficient of variation of the breaking elongation exceeded 60 or 70, respectively. Under the conditions of Comparative Examples 2 and 3, the lyocell material was not manufactured as described above. From the evaluation results of Comparative Examples 1 to 4, the Ra of the second blade 2 It can be confirmed that when the value is 1200 nm or more, the uniformity of the lyocell material manufactured using the second blade is significantly damaged.

[0444] In addition, the lyocell materials of Comparative Examples 5 and 6 were found to have significantly poor processability as continuous manufacturing was not possible.

Claims

1. Contains crimped lyocell multifilament, Lyocell material having a coefficient of variation of the above crimp count of 50% or less.

2. In paragraph 1, The coefficient of variation of the above crimp count is a value calculated according to the following equation 1, Lyocell material: [Formula 1] Coefficient of variation of crimp count (%) = [(standard deviation of crimp count) / (mean of crimp count)] * 100 In equation 1, The mean number of crimps and the standard deviation of the number of crimps are calculated for monofilaments having 50 or more strands contained in the above lyocell material.

3. In paragraph 1, The coefficient of variation of the above crimp count is a value calculated according to the following equation 1-1, Lyocell material: [Formula 1-1] Coefficient of variation of crimp count (%) = [(standard deviation of crimp count of central and edge filaments) / (average of crimp count of central and edge filaments)] * 100 In equation 1-1, Regarding an imaginary first line parallel to the longitudinal direction of the lyocell material and passing through the center point of the lyocell material, an imaginary second line parallel to the first line and passing through one end of the lyocell material, and an imaginary third line parallel to the second line and passing through the other end of the lyocell material, The above central filament represents a monofilament located closer to the first line than to the second line or the third line, The above-mentioned edge filament refers to a monofilament located closer to the second line or the third line than to the first line.

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

5. In paragraph 1, Lyocell material having a tensile strength of 0.3 gf / d to 1.0 gf / d.

6. In paragraph 1, Lyocell material having a coefficient of variation of tensile strength of 70% or less.

7. In paragraph 6, The coefficient of variation of the above tensile strength is a value calculated according to the following equation 2, Lyocell material: [Formula 2] Coefficient of variation of tensile strength (%) = [(standard deviation of tensile strength) / (mean of tensile strength)] * 100 In equation 2, The mean tensile strength and standard deviation of tensile strength are calculated for monofilaments having 50 or more strands contained in the above lyocell material.

8. In paragraph 1, Lyocell material having a breaking strength of 2.0% to 10.0%.

9. In paragraph 1, Lyocell material with a coefficient of variation of cutting strength of less than 50%.

10. In paragraph 9, The coefficient of variation of the above breaking strength is a value calculated according to the following equation 3, Lyocell material: [Formula 3] Coefficient of variation of shear strength (%) = [(standard deviation of shear strength) / (mean of shear strength)] * 100 In the third equation, The mean breaking elongation and standard deviation of breaking elongation are calculated for monofilaments having 50 or more strands contained in the above lyocell material.

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

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

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

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

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

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

17. 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 crimping step is performed by a crimping device including one or more side plates, A method for manufacturing a lyocell material, wherein the surface roughness of the above side plate is 1000 nm or less.

18. In paragraph 17, A method for manufacturing a lyocell material, wherein the surface roughness of the above side plate is 100 nm or more.

19. In Article 17, A method for manufacturing a lyocell material, wherein the crimping device further comprises one or more blades, and the surface roughness of the blades is less than 1200 nm.

20. In paragraph 19, The crimp device comprises a first blade and a second blade, wherein the first blade and the second blade are spaced apart from each other, A method for manufacturing a lyocell material, wherein the surface roughness of the first blade and the surface roughness of the second blade are independently less than 1200 nm.