Dope for spinning, lyocell material, filter for smoking article, smoking article, and manufacturing methods therefor

Abstract

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

Description

Radiation dope, lyocell material, filters for smoking articles, smoking articles and methods for manufacturing them

[0001] The present application relates to a radiation dope, a lyocell material, a filter comprising the same, a smoking article, and a method 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 material that can replace commercially available cellulose acetate for use in filters for smoking articles, and / or a spinning dope for producing a lyocell material for filters for smoking articles that is environmentally friendly in its production process and has excellent biodegradability when disposed of.

[0006] Another object of the present application is to provide a lyocell filter for smoking articles.

[0007] Another object of the present application is to provide a smoking article (e.g., a cigarette) comprising a lyocell filter.

[0008] According to one aspect of the present application, a radiation dope, a lyocell material, a filter including the same, and a smoking article may be provided.

[0009] The above lyocell material may include one or more lyocell multifilaments.

[0010] The above lyocell multifilament may comprise one or more lyocell monofilaments.

[0011] According to one aspect of the present application, a spinning dope comprising cellulose pulp and NMMO (N-Methylmorpholine N-oxide) and having a complex viscosity of 10 Pa·s to 200 Pa·s is provided.

[0012] According to another aspect of the present application, a lyocell material comprising lyocell multifilaments radiated using the above-described radiant dope can be provided.

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

[0014] According to another aspect of the present application, a smoking article comprising the lyocell material or filter may be provided.

[0015] 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.

[0016]

[0017] 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.

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

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

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

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

[0022] As used herein, “blooming 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.

[0023] 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.

[0024] 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.

[0025] In some embodiments, the lyocell multifilament comprises one or more monofilaments, all of which may have a heterogeneous cross-section.

[0026] As used herein, "tensile strength" refers to the maximum tensile force or tension that a filament or fiber can withstand before breaking. It measures the mechanical strength of a filament or fiber and is an important parameter in determining durability and reliability. Tensile strength is measured as force per unit area.

[0027] In this specification, "viscosity" or "complex viscosity" refers to the dynamic resistance of a fluid to shape change or to the movement of adjacent parts relative to each other. Viscosity or complex viscosity is defined as the product of force times time divided by area. Therefore, the SI unit is N·s / m 2 or Pa·s. Viscosity can be measured with various types of viscometers and rheometers. Complex viscosity represents the ratio of stress to oscillatory shear stress and is typically measured with a rheometer.

[0028] 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.

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

[0030] 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.

[0031]

[0032] Unless otherwise specifically defined herein, if the characteristics of lyocell materials, filters for smoking articles, and their related components or compositions are affected by temperature, the temperature at which the characteristics 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.

[0033] Hereinafter, the present invention will be described in more detail.

[0034]

[0035] 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.

[0036]

[0037] According to one aspect of the present application, a spinning dope comprising cellulose pulp and NMMO (N-Methylmorpholine N-oxide) and having a complex viscosity of 10 Pa·s to 200 Pa·s is provided.

[0038] In some embodiments, in the radiant dope, the cellulose pulp comprises alpha-cellulose, and the content of alpha-cellulose may be 85 wt% or more based on 100 wt% of the cellulose pulp.

[0039] In some embodiments, in the radiant dope, the cellulose pulp further comprises hemicellulose, and the content of hemicellulose may be less than 15 wt% with respect to 100 wt% of the cellulose pulp.

[0040] In some embodiments, in the radiant dope, the degree of polymerization (DPW) of the cellulose pulp may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose and / or alpha-cellulose and / or hemicellulose within the cellulose pulp.

[0041] In some embodiments, in the radiation dope, the radiation dope further comprises water, and the water content may be 5 to 20 parts by weight for a total of 100 parts by weight of NMMO and water.

[0042] In some embodiments, for a radial dope, the complex viscosity can be measured by vibrating the radial dope at a frequency of 20 rad / s.

[0043] In some embodiments, for the radial dope, the complex viscosity can be measured using a rotational rheometer.

[0044] In some embodiments, for the radiative dope, the complex viscosity can be measured at 110°C to 120°C.

[0045] In addition, according to another aspect of the present application, a lyocell material is provided comprising lyocell multifilaments radiated using any one of the above-described radiant dopes.

[0046] In some embodiments, in the lyocell material, the lyocell multifilament may be crimped. The crimp may be applied in the crimping step of the method for manufacturing the lyocell material described below.

[0047] In some embodiments, in the lyocell material, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0048] In some embodiments, in the lyocell material, the monofilaments may not have a circular cross-section. For example, not all monofilaments may have a circular cross-section.

[0049] In some embodiments, for the lyocell material, the number of crimps of the lyocell material can be from 3.94 ea / cm to 23.62 ea / cm (10 ea / inch to 60 ea / inch).

[0050] In some embodiments, for the lyocell material, the number of crimps of the lyocell material can be from 9.84 ea / cm to 19.69 ea / cm (25 ea / inch to 50 ea / inch).

[0051] In some embodiments, for lyocell materials, the tensile strength of the monofilaments can be from 0.132 N / tex to 0.618 N / tex (1.5 gf / d to 7.0 gf / d).

[0052] In some embodiments, for the lyocell material, the tensile strength of the monofilament may be from 0.265 N / tex to 0.530 N / tex (3.0 gf / d to 6.0 gf / d).

[0053] In some embodiments, for lyocell materials, the breaking elongation of the monofilaments may be from 2.0% to 10.0%.

[0054] In some embodiments, for lyocell materials, the breaking elongation of the monofilaments may be from 3.5% to 7.5%.

[0055] In some embodiments, for the lyocell material, the single fiber count of the lyocell multifilament may be from 1.67 to 9.44 dtex (1.5 to 8.5 denier).

[0056] In some embodiments, the lyocell material may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0057] In some embodiments, the lyocell material may be lyocell tow.

[0058] In some embodiments, the lyocell material may be a filter for a smoking article.

[0059] Additionally, according to another aspect of the present application, a filter for a smoking article comprising any one of the above-described lyocell materials is provided.

[0060] Additionally, according to another aspect of the present application, a smoking article is provided comprising any one of the filters for smoking articles described above.

[0061] In addition, according to another aspect of the present application, a method for producing a lyocell material is provided, comprising a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; an emulsion treatment step; and a crimping step.

[0062] In some embodiments, in the method for manufacturing a lyocell material, the lyocell dope spinning step is performed using a spinning dope comprising cellulose pulp and NMMO (N-Methylmorpholine N-oxide), and the complex viscosity of the spinning dope may be 10 Pa·s to 200 Pa·s.

[0063] In some embodiments, in the method for producing a lyocell material, the cellulose pulp includes alpha-cellulose, and the content of alpha-cellulose may be 85 wt% or more with respect to 100 wt% of the cellulose pulp.

[0064] In some embodiments, in the method for producing a lyocell material, the cellulose pulp further includes hemicellulose, and the content of hemicellulose may be less than 15 wt% with respect to 100 wt% of the cellulose pulp.

[0065] In some embodiments, in the method for producing a lyocell material, the degree of polymerization (DPW) of the cellulose pulp may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose and / or alpha-cellulose and / or hemicellulose within the cellulose pulp.

[0066] In some embodiments, in the method for manufacturing a lyocell material, the spinning dope further contains water, and the water content may be 5 to 20 parts by weight based on 100 parts by weight of the total of NMMO and water.

[0067] In some embodiments, in the method for manufacturing a lyocell material, the complex viscosity can be measured by vibrating the spinning dope at a frequency of 20 rad / s.

[0068] In some embodiments, in the method for manufacturing a lyocell material, the radiation of the radiation dope is performed through a radiation port, the radiation port includes one or more discharge ports, and the area of ​​the discharge ports is 0.01 mm. 2 0.1 mm 2 It could be.

[0069] In some embodiments, in the method for manufacturing a lyocell material, the spinning speed of the lyocell dope spinning step may be from 50 m / min to 500 m / min.

[0070] In some embodiments, in the method for manufacturing a lyocell material, the draft ratio of the lyocell dope spinning step may be 2.5 to 28.

[0071]

[0072] In some embodiments, the radiative dope has a complex viscosity of 10 Pa·s to 200 Pa·s. In some embodiments, the lower limit of the complex viscosity is 10 Pa·s, 15 Pa·s, 20 Pa·s, 25 Pa·s, 30 Pa·s, 35 Pa·s, 40 Pa·s, 45 Pa·s, 50 Pa·s, 55 Pa·s, 60 Pa·s, 65 Pa·s, 70 Pa·s, 75 Pa·s, 80 Pa·s. Pa·s, 85 Pa·s, 90 Pa·s, 95 Pa·s, 100 Pa·s, 105 Pa·s, 110 Pa·s, 115 Pa·s, 120 Pa·s, 125 Pa·s, 130 Pa·s, 135 Pa·s, 140 Pa·s, 150 Pa·s, 155 Pa·s, 160 Pa·s, 165 Pa·s, It can be 170 Pa·s, 175 Pa·s, 180 Pa·s, 185 Pa·s, 190 Pa·s, or 195 Pa·s. Additionally, in some embodiments, the upper limit of the complex viscosity is 200 Pa·s, 195 Pa·s, 190 Pa·s, 185 Pa·s, 180 Pa·s, 175 Pa·s, 170 Pa·s, 165 Pa·s, 160 Pa·s, 155 Pa·s, 150 Pa·s, 145 Pa·s, 140 Pa·s, 135 Pa·s, 130 Pa·s, 125 Pa·s, 120 Pa·s, 115 Pa·s, 110 Pa·s, 105 Pa·s, 100 Pa·s, 95 Pa·s, 90 Pa·s, 85 Pa·s, 80 Pa·s, 75 Pa·s, 70 Pa·s, 65 Pa·s, 60 Pa·s, 55 It may be Pa·s, 50 Pa·s, 45 Pa·s, 40 Pa·s, 35 Pa·s, 30 Pa·s, 25 Pa·s, 20 Pa·s, or 15 Pa·s.

[0073] In some embodiments, the complex viscosity of the radiation dope is from 10 Pa·s to 200 Pa·s, from 10 Pa·s to 190 Pa·s, from 10 Pa·s to 180 Pa·s, from 10 Pa·s to 170 Pa·s, from 10 Pa·s to 160 Pa·s, from 10 Pa·s to 150 Pa·s, from 10 Pa·s to 140 Pa·s, from 10 Pa·s to 130 Pa·s, from 10 Pa·s to 120 Pa·s, from 10 Pa·s to 110 Pa·s, from 10 Pa·s to 100 Pa·s, from 10 Pa·s to 90 Pa·s, from 10 Pa·s to 80 Pa·s, from 10 Pa·s to 70 Pa·s, from 10 Pa·s to 60 Pa·s, from 10 Pa·s to 50 Pa·s, 10 Pa·s to 40 Pa·s, 10 Pa·s to 30 Pa·s, 10 Pa·s to 20 Pa·s, 20 Pa·s to 200 Pa·s, 20 Pa·s to 190 Pa·s, 20 Pa·s to 180 Pa·s, 20 Pa·s to 170 Pa·s, 20 Pa·s to 160 Pa·s, 20 Pa·s to 150 Pa·s, 20 Pa·s to 140 Pa·s, 20 Pa·s to 130 Pa·s, 20 Pa·s to 120 Pa·s, 20 Pa·s to 110 Pa·s, 20 Pa·s to 100 Pa·s, 20 Pa·s to 90 Pa·s, 20 Pa·s to 80 Pa·s, 20 Pa·s to 70 Pa·s, 20 Pa·s to 60 Pa·s, 20 Pa·s to 50 Pa·s, 20 Pa·s to 40 Pa·s, 20 Pa·s to 30 Pa·s, 30 Pa·s to 200 Pa·s, 30 Pa·s to 190 Pa·s, 30 Pa·s to 180 Pa·s, 30 Pa·s to 170 Pa·s, 30 Pa·s to 160 Pa·s, 30 Pa·s to 150 Pa·s, 30 Pa·s to 140 Pa·s, 30 Pa·s to 130 Pa·s, 30 Pa·s to 120 Pa·s, 30 Pa·s to 110 Pa·s,30 Pa·s to 100 Pa·s, 30 Pa·s to 90 Pa·s, 30 Pa·s to 80 Pa·s, 30 Pa·s to 70 Pa·s, 30 Pa·s to 60 Pa·s, 30 Pa·s to 50 Pa·s, 30 Pa·s to 40 Pa·s, 40 Pa·s to 200 Pa·s, 40 Pa·s to 190 Pa·s, 40 Pa·s to 180 Pa·s, 40 Pa·s to 170 Pa·s, 40 Pa·s to 160 Pa·s, 40 Pa·s to 150 Pa·s, 40 Pa·s to 140 Pa·s, 40 Pa·s to 130 Pa·s, 40 Pa·s to 120 Pa·s, 40 Pa·s to 110 Pa·s, 40 Pa·s to 100 Pa·s, 40 Pa·s to 90 Pa·s, 40 Pa·s to 80 Pa·s, 40 Pa·s to 70 Pa·s, 40 Pa·s to 60 Pa·s, 40 Pa·s to 50 Pa·s, 50 Pa·s to 200 Pa·s, 50 Pa·s to 190 Pa·s, 50 Pa·s to 180 Pa·s, 50 Pa·s to 170 Pa·s, 50 Pa·s to 160 Pa·s, 50 Pa·s to 150 Pa·s, 50 Pa·s to 140 Pa·s, 50 Pa·s to 130 Pa·s, 50 Pa·s to 120 Pa·s, 50 Pa·s to 110 Pa·s, 50 Pa·s to 100 Pa·s, 50 Pa·s to 90 Pa·s, 50 Pa·s to 80 Pa·s, 50 Pa·s to 70 Pa·s, 50 Pa·s to 60 Pa·s, 60 Pa·s to 200 Pa·s, 60 Pa·s to 190 Pa·s, 60 Pa·s to 180 Pa·s, 60 Pa·s to 170 Pa·s, 60 Pa·s to 160 Pa·s, 60 Pa·s to 150 Pa·s, 60 Pa·s to 140 Pa·s, 60 Pa·s to 130 Pa·s, 60 Pa·s to 120 Pa·s, 60 Pa·s to 110 Pa·s,60 Pa·s to 100 Pa·s, 60 Pa·s to 90 Pa·s, 60 Pa·s to 80 Pa·s, 60 Pa·s to 70 Pa·s, 70 Pa·s to 200 Pa·s, 70 Pa·s to 190 Pa·s, 70 Pa·s to 180 Pa·s, 70 Pa·s to 170 Pa·s, 70 Pa·s to 160 Pa·s, 70 Pa·s to 150 Pa·s, 70 Pa·s to 140 Pa·s, 70 Pa·s to 130 Pa·s, 70 Pa·s to 120 Pa·s, 70 Pa·s to 110 Pa·s, 70 Pa·s to 100 Pa·s, 70 Pa·s to 90 Pa·s, 70 Pa·s to 80 Pa·s, 80 Pa·s to 200 Pa·s, 80 Pa·s to 190 Pa·s, 80 Pa·s to 180 Pa·s, 80 Pa·s to 170 Pa·s, 80 Pa·s to 160 Pa·s, 80 Pa·s to 150 Pa·s, 80 Pa·s to 140 Pa·s, 80 Pa·s to 130 Pa·s, 80 Pa·s to 120 Pa·s, 80 Pa·s to 110 Pa·s, 80 Pa·s to 100 Pa·s, 80 Pa·s to 90 Pa·s, 90 Pa·s to 200 Pa·s, 90 Pa·s to 190 Pa·s, 90 Pa·s to 180 Pa·s, 90 Pa·s to 170 Pa·s, 90 Pa·s to 160 Pa·s, 90 Pa·s to 150 Pa·s, 90 Pa·s to 140 Pa·s, 90 Pa·s to 130 Pa·s, 90 Pa·s to 120 Pa·s, 90 Pa·s to 110 Pa·s, 90 Pa·s to 100 Pa·s, 100 Pa·s to 200 Pa·s, 100 Pa·s to 190 Pa·s, 100 Pa·s to 180 Pa·s, 100 Pa·s to 170 Pa·s, 100 Pa·s to 160 Pa·s, 100 Pa·s to 150 Pa·s, 100 Pa·s to 140 Pa·s,100 Pa·s to 130 Pa·s, 100 Pa·s to 120 Pa·s, 100 Pa·s to 110 Pa·s, 110 Pa·s to 200 Pa·s, 110 Pa·s to 190 Pa·s, 110 Pa·s to 180 Pa·s, 110 Pa·s to 170 Pa·s, 110 Pa·s to 160 Pa·s, 110 Pa·s to 150 Pa·s, 110 Pa·s to 140 Pa·s, 110 Pa·s to 130 Pa·s, 110 Pa·s to 120 Pa·s, 120 Pa·s to 200 Pa·s, 120 Pa·s to 190 Pa·s, 120 Pa·s to 180 Pa·s, 120 Pa·s to 170 Pa·s, 120 Pa·s to 160 Pa·s, 120 Pa·s to 150 Pa·s, 120 Pa·s to 140 Pa·s, 120 Pa·s to 130 Pa·s, 130 Pa·s to 200 Pa·s, 130 Pa·s to 190 Pa·s, 130 Pa·s to 180 Pa·s, 130 Pa·s to 170 Pa·s, 130 Pa·s to 160 Pa·s, 130 Pa·s to 150 Pa·s, 130 Pa·s to 140 Pa·s, 140 Pa·s to 200 Pa·s, 140 Pa·s to 190 Pa·s, 140 Pa·s to 180 Pa·s, 140 Pa·s to 170 Pa·s, 140 Pa·s to 160 Pa·s, 140 Pa·s to 150 Pa·s, 150 Pa·s to 200 Pa·s, 150 Pa·s to 190 Pa·s, 150 Pa·s to 180 Pa·s, 150 Pa·s to 170 Pa·s, 150 Pa·s to 160 Pa·s, 160 Pa·s to 200 Pa·s, 160 Pa·s to 190 Pa·s, 160 Pa·s to 180 Pa·s, 160 Pa·s to 170 Pa·s, 170 Pa·s to 200 Pa·s, 170 Pa·s to 190 Pa·s, 170 Pa·s to 180 Pa·s,It may be 180 Pa·s to 200 Pa·s, 180 Pa·s to 190 Pa·s, or 190 Pa·s to 200 Pa·s.

[0074] By controlling the complex viscosity of the spinning dope within the above-described range, the spinning dope can have desirable physical properties for producing lyocell multifilaments. In particular, by satisfying the above-described range of complex viscosity, monofilaments produced from the spinning dope can have good orientation. As a result, entanglement between monofilaments can be suppressed during the spinning step, and uniform spinning of the monofilaments can be continuously performed. In addition, by suppressing entanglement between monofilaments, the lyocell multifilament including the monofilaments can be expected to have uniform physical properties in the width direction and the length direction.

[0075] Conversely, if the spinning dope has a complex viscosity of less than 10 Pa·s, the spinning dope may have flow properties that are unsuitable for spinning. As a result, the orientation of the monofilaments may not be uniform, and monofilament breakage may occur.

[0076] In particular, when the spinning dope has a complex viscosity of less than 10 Pa·s, weak filaments or flying filaments can be produced from the spinning dope. Weak filaments refer to filaments with deteriorated mechanical properties due to insufficient strength and / or elongation. Flying filaments refer to filaments that are ejected from the spinneret and are unable to be fed into the coagulation tank and break or fly away.

[0077] In some instances, if more than 5 wt% of the particles are present in a single detention, the radioactivity is assessed as poor.

[0078] Furthermore, if the spinning dope has a complex viscosity exceeding 200 Pa·s, the strong viscosity may limit the production of monofilaments with small fineness. Furthermore, the discharge port included in the spinneret may be blocked by the spinning dope. As a result, continuous production of lyocell material may be fundamentally impossible.

[0079] In particular, when the dope for spinning has a complex viscosity exceeding 200 Pa·s, the dope for spinning may not be smoothly discharged from the discharge port and may be discharged from the discharge port in the form of a drip. As a result, the production of filaments from the dope for spinning may be limited.

[0080] In some embodiments, if more than 5 wt% of drip occurs in one detention, the radioactivity is evaluated as poor.

[0081] Meanwhile, by using a spinning dope that satisfies a predetermined complex viscosity, the draft ratio range of the spinning step can be further expanded. In particular, the draft ratio can be 2.5 to 28. By expanding the draft ratio range, the properties of the monofilament manufactured from the spinning dope can be controlled over a wider range. In particular, by using the spinning dope, the fineness of the monofilament can be controlled over a wider range. For example, by using the spinning dope, the single fineness of the lyocell material can be implemented to be 2.22 dtex (2.0 d) or less.

[0082] In addition, the monofilament manufactured from the radiant dope can provide a lyocell material having good orientation, a small single fiber count, and increased tensile strength and / or breaking elongation.

[0083] Furthermore, since the lyocell material satisfies the aforementioned requirements of small fiber counts, increased tensile strength, and / or increased breaking elongation, a smoking article filter comprising the lyocell material can provide increased specific surface area and enhanced mechanical properties. As a result, a smoking article comprising the lyocell filter can provide a user with a high-quality feel and enhanced filtering performance.

[0084]

[0085] [Irregular cross-section]

[0086] 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.

[0087] 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.”

[0088] 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.

[0089] 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.

[0090] The heterogeneous cross-section may have a shape including multiple protrusions, for example, a Y-shaped cross-section including three protrusions. The multiple protrusions may be understood as being formed integrally with the imaginary second circle as the center, and their ends are in contact with the imaginary first circle. The terms mentioned herein have the same meanings as those described above.

[0091] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0092] <Mathematical Formula 1>

[0093] Lee Hyung-do = r1 / r2

[0094] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0095] 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.

[0096] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0097] <Mathematical Formula 2>

[0098] Space occupancy = (S1 / S2) Х 100(%)

[0099] 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.

[0100] For example, the space occupancy of a monofilament having a heterogeneous cross-section can be 120 to 600%.

[0101] In some embodiments, in the lyocell material, the lyocell multifilament comprises one or more monofilaments, and one or more of the monofilaments may have a non-uniform cross-section.

[0102] In some embodiments, in the lyocell material, the monofilaments may not have a circular cross-section. In some embodiments, not all of the monofilaments may have a circular cross-section. In some embodiments, all of the monofilaments may have a circular cross-section.

[0103]

[0104]

[0105] [Island]

[0106] 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.

[0107] For example, the single filament fineness of the filaments forming the above lyocell multifilament may be 1.67 to 9.44 dtex (1.5 to 8.5 denier). In this case, the single filament fineness refers to the fineness of one monofilament separated from the multifilament.

[0108] In particular, the single fiber count of the filament may be 8.89 dtex (8.0 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, in particular, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., implementation of hardness or suction resistance, etc.) and fairness of the filter for smoking articles.

[0109] In one 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, in particular, 6,056 tex (54,500 denier) or less, 6,000 tex (54,000 denier) or less, 5,944 tex (53,500 denier) or less, 5,889 tex (53,000 denier) or less, 5,833 tex (52,500 denier) or less, 5,778 tex (52,000 denier) or less, 5,722 tex (51,500 denier) or less, 5,667 tex (51,000 denier) or less, 5,611 tex (50,500 denier) or less, 5,556 tex (50,000 denier) or less, 5,500 tex (49,500 denier) or less, 5,444 tex (49,000 denier) or less. 5,389 tex (48,500 denier) or less, 5,333 tex (48,000 denier) or less, 5,278 tex (47,500 denier) or less, 5,222 tex (47,000 denier) or less, 5,167 tex (46,500 denier) or less, 5,111 tex (46,000 denier) or less, 5,056 tex (45,500 denier) or less, 5,000 tex (45,000 denier) or less, 4,944 tex (44,500 denier) or less, 4,889 tex (44,000 denier) or less, 4,833 tex (43,500 denier) or less, 4,778 tex (43,000 denier) or less, 4,722 tex (42,500 denier) or less, 4,667 tex (42,000 denier) or less, 4,611 tex (41,500 denier) or less, 4,556 tex (41,000 denier) or less, 4,500 tex (40,500 denier) or less, 4,444 tex (40,000 denier) or less, 4,389 tex (39,500 denier) or less, 4,333 tex (39,000 denier) or less, 4,278 tex (38,500 denier) or less, 4,222 tex (38,000 denier) or less, 4,167 tex (37,500 denier) or less, 4,111 tex (37,000 denier) or less, 4,056 tex (36,500 denier) or less, 4,000 tex (36,000 denier) or less, 3,944 tex (35,500 denier) or less, 3,889 tex (35,000 denier) or less, 3,833 tex (34,500 denier) or less, 3,778 tex (34,000 denier) or less, 3,722 tex (33,500 denier) or less, 3,667 tex (33,000 denier) or less, 3,611 tex (32,500 denier) or less, 3,556 tex (32,000 denier) or less, 3,500 tex (31,500 denier) or less, 3,444 tex (31,000 denier) or less, 3,389 tex (30,500 denier) or less, 3,333 tex (30,000 denier) or less, 3,278 tex (29,500 denier) or less, 3,222 tex (29,000 denier) or less, 3,167 tex (28,500 denier) or less, 3,111 tex (28,000 denier) or less, 3,056 tex (27,500 denier) or less, 3,000 tex (27,000 denier) or less, 2,944 tex (26,500 denier) or less, 2,889 tex (26,000 denier) or less, 2,833 tex (25,500 denier) or less, 2,778 tex (25,000 denier) or less, 2,722 tex (24,500 denier) or less, 2,667 tex (24,000 denier) or less, 2,611 tex (23,500 denier) or less, 2,556 tex (23,000 denier) or less, 2,500 tex (22,500 denier) or less, 2,444 tex (22,000 denier) or less, 2,389 tex (21,500 denier) or less, 2,333 tex (21,000 denier) or less, 2,278 tex (20,500 denier) or less, 2,222 tex (20,000 denier) or less, 2,167 tex (19,500 denier) or less, 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.).

[0110] The method for measuring fineness is not particularly limited, but for example, take a 2 m sample of the lyocell material to be measured, for example, lyocell tow, and leave it in a room that is kept in a constant temperature and humidity of 20℃ and 65% humidity for 24 hours to stabilize. Fix one end of the stabilized lyocell tow, and attach a weight with a load of 2 kg to the other end. After maintaining the tow in a state of being extended by the load (stabilization) for 5 seconds, cut it into 90 cm to obtain a sample, and measure the weight of the sample (total fineness). The fineness is converted into 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.

[0111] The total fineness of the lyocell multifilament as described above can be determined by the single fineness and crimp count of the filament. In the present application, the single fineness and crimp count can be controlled, and a total fineness of the tow suitable for manufacturing a filter for a smoking article and ensuring its function can be secured.

[0112]

[0113] [Number of crimps]

[0114] In one example, lyocell multifilament can have crimps of 3.94 to 19.69 per centimeter (10 to 50 per inch). For example, the number of crimps may be 5.91 ea / cm (15 ea / inch) or more, 7.87 ea / cm (20 ea / inch) or more, 9.84 ea / cm (25 ea / inch) or more, 11.81 ea / cm (30 ea / inch) or more, 13.78 ea / cm (35 ea / inch) or more, 15.75 ea / cm (40 ea / inch) or more, or 17.72 ea / cm (45 ea / inch) or more, and the upper limit may be, for example, 17.72 ea / cm (45 ea / inch) or less, 15.75 ea / cm (40 ea / inch) or less, 13.78 ea / cm (35 ea / inch) or less, 11.81 ea / cm (30 ea / inch) or less, or 9.84 It may be less than ea / cm (25 ea / inch). The number of crimps and their uniformity can be controlled through pressure and temperature conditions, etc., related to the crimping step described below.

[0115] Although not particularly limited, the number of crimps can be measured, for example, using a single-fiber property evaluation device (e.g., Favimat). In particular, a manufactured lyocell material (preferably, lyocell tow) sample can be left and stabilized for 24 hours under conditions of a temperature of 20±2℃ and a humidity of 65±4%. A sample can be collected from the stabilized sample without damaging the crimp. The collected sample can be mounted on a dedicated jig with a gauge length of 10 to 30 mm. The initial load during measurement can be 0.05 g / d, and the crimp sensitivity can be 0.01 mm. The number of crimps can be measured under the conditions described above (i.e., a temperature of 20±2℃ and a humidity of 65±4%).

[0116] Although not specifically limited, lyocell materials manufactured to meet the single fiber count, total fiber count, and / or crimp count described above may be used in smoking articles.

[0117]

[0118] [tensile strength]

[0119] In some embodiments, for the lyocell material, the tensile strength of the monofilament may be from 0.177 N / tex to 0.706 N / tex (2.0 gf / d to 8.0 gf / d). Preferably, the upper limit of the tensile strength of the monofilament may be 0.662 N / tex (7.5 gf / d), 0.618 N / tex (7.0 gf / d), 0.574 N / tex (6.5 gf / d), 0.530 N / tex (6.0 gf / d), 0.485 N / tex (5.5 gf / d), 0.441 N / tex (5.0 gf / d), 0.397 N / tex (4.5 gf / d), 0.353 N / tex (4.0 gf / d), 0.309 N / tex (3.5 gf / d), 0.265 N / tex (3.0 gf / d), 0.221 N / tex (2.5 gf / d), or 0.177 N / tex (2.0 gf / d), and the tensile strength of the monofilament The lower limit of strength may be 0.221 N / tex (2.5 gf / d), 0.265 N / tex (3.0 gf / d), 0.309 N / tex (3.5 gf / d), 0.353 N / tex (4.0 gf / d), 0.397 N / tex (4.5 gf / d), 0.441 N / tex (5.0 gf / d), 0.485 N / tex (5.5 gf / d), 0.530 N / tex (6.0 gf / d), 0.574 N / tex (6.5 gf / d), 0.618 N / tex (7.0 gf / d), or 0.662 N / tex (7.5 gf / d).

[0120] The tensile strength of the lyocell material can be measured using a tensile tester. Although not particularly limited, a low-speed extension tensile tester (e.g., a low-speed extension tensile tester from Instron) can be considered as the tensile tester. To evaluate the tensile strength, a sample (preferably, a monofilament) can be taken from the lyocell material. The sample can be stretched at a constant tensile speed by the tensile tester. For example, the tensile speed can be 100 mm / min, 90 mm / min, 80 mm / min, 70 mm / min, 60 mm / min, 50 mm / min, 40 mm / min, or 30 mm / min.

[0121] Additionally, the lyocell material and / or monofilament may be stabilized under constant temperature and humidity conditions prior to measuring the tensile strength. For example, the constant temperature condition may be a temperature of 20±2°C, and the constant humidity condition may be a humidity of 65±4%RH. Additionally, the stabilization may be performed for 24 hours or more.

[0122] Although not specifically limited, lyocell materials manufactured to meet the tensile strength described above may be used in smoking articles.

[0123]

[0124] [Amputated believer]

[0125] In some embodiments, for the lyocell material, the breaking elongation of the monofilament can be from 2.0% to 10.0%. Preferably, the upper limit of the breaking elongation of the monofilament 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 breaking elongation can be 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%.

[0126] The breaking elongation of the lyocell material can be measured using a tensile tester. Although not particularly limited, a low-speed extension tensile tester (e.g., a low-speed extension tensile tester from Instron) can be considered as the tensile tester. To evaluate the breaking elongation, a sample (preferably, a monofilament) can be taken from the lyocell material. The sample can be stretched at a constant tensile speed by the tensile tester. For example, the tensile speed can be 100 mm / min, 90 mm / min, 80 mm / min, 70 mm / min, 60 mm / min, 50 mm / min, 40 mm / min, or 30 mm / min.

[0127] Additionally, the lyocell material and / or monofilament may be stabilized under constant temperature and humidity conditions prior to measuring the breaking elongation. For example, the constant temperature condition may be a temperature of 20±2°C, and the constant humidity condition may be a humidity of 65±4%RH. Additionally, the stabilization may be performed for 24 hours or more.

[0128] Although not specifically limited, lyocell materials manufactured to meet the above-described breaking elongation may be used in smoking articles.

[0129]

[0130] [bookbinder]

[0131] 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).

[0132] 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.

[0133] In one non-limiting example, the binder may include a polyester-based binder, a cellulosic-based binder, and / or a vinyl-based binder.

[0134] 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.

[0135] 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.

[0136] In some embodiments, the cellulose-based binder is selected from the group consisting of hydroxypropylmethylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and combinations thereof.

[0137] 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).

[0138] In some embodiments, the vinyl binder is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and combinations thereof.

[0139] The method of applying the above binder to the lyocell material (e.g., coating) is described below.

[0140]

[0141] [emulsion]

[0142] 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.

[0143] 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.

[0144] 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.” In some embodiments, the lyocell material may contain the emulsion in an amount of 0.1 wt% or more, based on 100 wt% of the total lyocell material. In particular, the content of the emulsion may be 0.5 wt% or more, 1.0 wt% or more, 1.5 wt% or more, 2.0 wt% or more, 2.5 wt% or more, 3.0 wt% or more, particularly 3.5 wt% or more, 4.0 wt% or more, 4.2 wt% or more, 4.5 wt% or more, 5.0 wt% or more, 5.5 wt% or more, 6.0 wt% or more, 6.5 wt% or more, 7.0 wt% or more, 7.5 wt% or more, 8.0 wt% or more, 8.5 wt% or more, 9.0 wt% or more, or 9.5 wt% or more, based on 100 wt% of the total lyocell material. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on 100 wt% of the total lyocell material.

[0145] As a method for measuring the content (OPU) of the above-mentioned emulsion, an extrusion method can be used, for example. For example, a sample (e.g., 2 to 5 g, particularly about 2.5 g) is collected (the weight of the collected sample is referred to as the sample weight) and the sample is placed in a syringe-shaped container. The material of the container is not particularly limited, but may be SUS (stainless steel). Next, a solvent (e.g., methanol) is placed in the container into which the sample has been placed (the amount of the solvent placed may be 10 ml or less (e.g., about 8 ml)). The solvent may be placed in a dropping manner when the sample is placed, and the dropping speed is controlled uniformly. Then, the solvent placed in the container as described above is allowed to fall from one end of the syringe-shaped container onto a plate. At this time, the plate is pre-weighed (the weighed weight is referred to as plate weight A), and the plate is installed so that the solvent dropped on the plate can fly away (i.e., evaporate) at a temperature of 120 to 130°C (e.g., 125°C). The above-described solvent injection and solvent dropping are performed three times, and a pressure (e.g., 98 N / cm) is applied to the sample using a syringe-shaped container. 2 (10 kgf / cm 2 ) or less, 49 N / cm 2 (5 kgf / cm 2 ) or less or 18-39 N / cm 2 (2-4 kgf / cm 2 )) and press the sample once. This sufficiently extrudes the solvent and emulsion present in the sample. Squeeze the sample by applying pressure until no solvent comes out. Afterwards, store the plate in a desiccator for 5 to 10 minutes, and measure the weight of the plate containing the sample (plate weight B). Then, calculate the emulsion content according to the formula below.

[0146] Food

[0147] Content of emulsion by extrusion (OPU, % or wt%)

[0148] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0149] 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.

[0150] In relation to the emulsion of the present application, the component (a) may be 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. The component (a) may impart lubricity to the fibers fed into the crimping device. If the lubricity is insufficient, the lyocell may clump together and not be able to escape the crimping device. If the lubricity is excessive, crimping may not occur properly. The content of the component (a) may be controlled, taking these functions into account, as described below.

[0151] 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.

[0152] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0153] Saturated fatty acids include, for example, palmitic acid (hexadecanoic acid, CH3(CH2) 14COOH), 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.

[0154] 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.

[0155] In some embodiments, the fatty acid is selected from the group consisting of palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid and arachidonic acid.

[0156] 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.

[0157] With respect to the above component (a), the type of aliphatic monohydric alcohol forming the ester compound is also not particularly limited. Any aliphatic monohydric alcohol capable of providing an ester compound that is harmless to the human body and can be used in food may be used.

[0158] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and it can have a linear or branched form.

[0159] For example, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. In particular, the carbon number of the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0160] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0161] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol, and stearyl alcohol.

[0162] In some embodiments, the component (a) may be an ester of isotridecanol and stearic acid (e.g., isotridecyl stearate). However, the types of usable component (a) are not limited thereto.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] With respect to the above component (b), the type of fatty acid having 16 or more carbon atoms that forms the esterified product is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an esterified product that is harmless to the human body and can be used in food can be used.

[0167] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0168] 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.

[0169] 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.

[0170] In some embodiments, the fatty acid is selected from the group consisting of palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, palmitoleic acid, oleic acid, linoleic acid and arachidonic acid.

[0171] 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.

[0172] 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.

[0173] (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.

[0174] 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.

[0175] In particular, the emulsion of the present application may contain the component (b) in an amount of 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, or 50 parts by weight or more, relative to 100 parts by weight of the component (a). In addition, the upper limit of the content of the component (b) relative to 100 parts by weight of the component (a) may be, for example, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, or 25 parts by weight or less. When the above content range is satisfied, the surface of the emulsion-treated lyocell multifilament or lyocell tow may have hydrophobicity.

[0176] In one example, the emulsion may comprise 40 to 80 wt% of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, based on 100 wt% of the total weight of the emulsion. In particular, the content of the component (a) may be 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, or 65 wt% or more, 70 wt% or more, or 75 wt% or more, based on 100 wt% of the total weight of the emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0177] In one example, the emulsion may contain an excess of component (a).

[0178] In one example, the emulsion may comprise 15 to 55 wt% of (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, based on 100 wt% of the total weight of the emulsion. In particular, the content of the (b) component may be 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, based on 100 wt% of the total weight of the emulsion. And the upper limit of the content may be, for example, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, or 25 wt% or less.

[0179] In one example, the emulsion may further contain water. A small amount of water may aid in emulsification.

[0180] 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.

[0181]

[0182] [Radiation dope]

[0183] According to an example, a spinning dope is provided, which comprises cellulose pulp and NMMO (N-Methylmorpholine N-oxide) and has a complex viscosity of 10 Pa·s to 200 Pa·s.

[0184] In particular, the lower limit of the complex viscosity may be 20 Pa·s or more, 30 Pa·s or more, 40 Pa·s or more, 50 Pa·s or more, 60 Pa·s or more, 70 Pa·s or more, 80 Pa·s or more, 90 Pa·s or more, 100 Pa·s or more, 110 Pa·s or more, 120 Pa·s or more, 130 Pa·s or more, 140 Pa·s or more, 150 Pa·s or more, 160 Pa·s or more, 170 Pa·s or more, 180 Pa·s or more, or 190 Pa·s or more, and the upper limit of the complex viscosity may be 190 Pa·s or less, 180 Pa·s or less, 170 Pa·s or less, 160 Pa·s or less, 150 Pa·s or less, 140 Pa·s or less, 130 Pa·s or less, or 120 Pa·s It may be less than, 110 Pa·s or less, 100 Pa·s or less, 90 Pa·s or less, 80 Pa·s or less, 70 Pa·s or less, 60 Pa·s or less, 50 Pa·s or less, 40 Pa·s or less, 30 Pa·s or less, or 20 Pa·s or less.

[0185] If the spinning dope has a complex viscosity of less than 10 Pa·s, the spinning dope may have flowability that is unsuitable for spinning. As a result, the orientation of the monofilament may not be uniform, and breakage of the monofilament may occur during spinning.

[0186] Conversely, if the spinning dope has a complex viscosity exceeding 200 Pa·s, the strong viscosity may limit the production of monofilaments with small fineness. Furthermore, the outlet included in the spinneret may be blocked by the spinning dope. As a result, continuous production of lyocell material may be fundamentally impossible.

[0187] For example, the complex viscosity can be measured by vibrating the radiating dope at a frequency of 0.1 rad / s to 500 rad / s. In particular, the complex viscosity of the radiating dope can be measured by vibrating the radiating dope at a frequency of 20 rad / s.

[0188] In some embodiments, the complex viscosity of the radiation dope may be measured using a rotational rheometer. For example, a cone-plate type rheometer may be used. Furthermore, although not particularly limited, the complex viscosity may be measured at a temperature ranging from 110°C to 120°C.

[0189] In one example, the content of cellulose in the spinning dope may be 5 to 15 wt% based on 100 wt% of the total weight of the dope. If the content of cellulose is too low, it is difficult to implement the characteristics of lyocell fibers, and if the content exceeds the above range, it is difficult to dissolve in a solvent. Considering this, the content of cellulose in the spinning dope may be 6 wt% or more, 7 wt% or more, 8 wt% or more, 9 wt% or more, or 10 wt% or more, based on 100 wt% of the total weight of the spinning dope, and the upper limit thereof may be, for example, 14 wt% or less, 13 wt% or less, 12 wt% or less, 11 wt% or less, 10 wt% or less, or 9 wt% or less, based on 100 wt% of the total weight of the spinning dope. The term “cellulose” may refer to “lyocell cellulose.”

[0190] In some embodiments, the radiation dope may further comprise water. Thus, the radiation dope may comprise an aqueous solution of N-methylmorpholine-N-oxide (NMMO). The aqueous solution may comprise, for example, 80 to 95 parts by weight of NMMO and 5 to 20 parts by weight of water, taking into account factors such as the degree of cellulose dissolution and the process temperature.

[0191] 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.

[0192] For example, the cellulose or cellulose pulp may have a hemicellulose content of 1 wt% to 15 wt% relative to 100 wt% of the total cellulose and / or cellulose pulp. By adjusting the hemicellulose content within the above range, stable physical properties (e.g., hardness or suction resistance implementation) and processability of the lyocell material can be more easily secured.

[0193] Additionally, in some embodiments, the degree of polymerization (DPw) of the cellulose may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose and / or alpha-cellulose and / or hemicellulose within the cellulose pulp.

[0194] Although not particularly limited, premixing of cellulose pulp and NMMO solvent and / or extrusion of the spinning dope may be performed to prepare a spinning dope having a complex viscosity of 10 Pa·s to 200 Pa·s. Premixing may increase the solubility of the cellulose pulp and improve the uniformity of the spinning dope. Extrusion of the spinning dope may pressurize and / or agitate the spinning dope, and the complex viscosity of the spinning dope may be controlled and specified.

[0195] Using the above-described spinning dope, a lyocell multifilament satisfying a predetermined fineness, a predetermined tensile strength, and / or a predetermined breaking elongation can be spun.

[0196]

[0197] [Method for manufacturing lyocell material]

[0198] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0199] In particular, the method for manufacturing the lyocell material includes a lyocell dope spinning step; a coagulation and multifilament obtaining step; a washing step; an emulsion treatment step; and a crimping step. In addition, the method for manufacturing the lyocell material may further include a binder treatment step; and other steps. In some embodiments, the steps are performed in the mentioned order.

[0200] The emulsion treatment step may be performed before the crimping step, after the crimping step, or before and after the crimping step.

[0201] 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.

[0202] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0203] 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.

[0204]

[0205] <(a) Lyocell dope radiation stage>

[0206] This step is a step of spinning lyocell multifilament using the spinning dope described above.

[0207] The dope for radiation may be premixed prior to radiation. Additional devices may be used for premixing the dope for radiation. For example, the dope for radiation may be premixed by a side feeder. The dope for radiation may be premixed within the side feeder for a residence time of 1 s to 3 s.

[0208] Additionally, the temperature inside the side feeder can be maintained at a constant level. For example, the temperature inside the side feeder can be maintained at 80°C to 100°C.

[0209] The dope for spinning can be extruded by an extruder prior to spinning. The complex viscosity of the dope for spinning can be controlled and specified by pressurizing and / or stirring the dope for spinning by the extruder.

[0210] Additionally, the temperature inside the extruder can be maintained at a constant level. For example, the temperature inside the extruder can be maintained at 80°C to 100°C.

[0211] The spinning step is performed by discharging the dope for spinning through a spinneret. For example, the cross-sectional shape of the lyocell monofilaments spun from the dope for spinning can be controlled by the cross-sectional shape of the outlet formed in the spinneret. As a shape of the nozzle for discharging the dope for spinning, for example, a spinneret with an irregular cross-sectional shape of the outlet can be used.

[0212] The nozzle temperature of the radiator, particularly the radiation temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the radiation dope may vary depending on the radiation temperature, which may result in poor ejection, the radiation temperature may be, for example, between 100°C and 120°C or lower, or between 100°C and 110°C or lower.

[0213] In some embodiments, the spinning step may be performed under controlled spinning conditions so that the single filament fineness may be 1.67 to 9.44 dtex (1.5 to 8.5 denier). For example, one or more spinning conditions among the discharge amount of the spinning dope and the spinning speed may be appropriately controlled so that the single filament fineness included in the lyocell material satisfies 1.67 to 9.44 dtex (1.5 to 8.5 denier). In this case, the single filament fineness refers to the fineness of a single monofilament separated from a multifilament.

[0214] 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.

[0215] In particular, by controlling the complex viscosity of the dope for spinning, the single-fiber density of the filament can be made to satisfy the above-described range. In particular, by satisfying the complex viscosity of the dope for spinning to be 10 Pa·s to 200 Pa·s, the orientation of the dope for spinning and the fairness of the spinning step can be secured simultaneously.

[0216]

[0217] <(b) Coagulation and multifilament production step>

[0218] In this step, the radiated lyocell spinning dope is coagulated, and lyocell multifilament can be obtained.

[0219] 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.

[0220] In one example, the solidification may include a first solidification step of supplying cooling air to the radiated lyocell dope; and a second solidification step of introducing the first-solidified radiated dope into a solidification solution to solidify it.

[0221] According to the above-described solidification method, the lyocell dope discharged from the spinneret can be first solidified in the space (air gap section) between the spinneret and the solidification tank. For example, cooling air can be supplied from the inside of the spinneret to the outside of the spinneret through this air gap section from an air-cooling unit located inside the spinneret. Alternatively, the first solidification can be achieved by a so-called air quenching method or means known in the relevant field.

[0222] In one example, the upper temperature limit of the cooling air used in the first solidification step may be, for example, 15°C or lower. In particular, the cooling air may be air having a temperature of 14°C or lower, 13°C or lower, 12°C or lower, 11°C or lower, or 10°C or lower. If the temperature exceeds the above, the solidification of the radiation-related dope by the air may not be sufficient, and the radiation-related processability may be poor.

[0223] 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.

[0224] 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 discharged at a wind speed of 100 Nm 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or more or 250 Nm 3 / h or more, and the upper limit of the airflow is, for example, 350 Nm 3 / h or less, 300 Nm 3 / h or less, 250 Nm 3 / h or less, 200 Nm 3 / h or less or 150 Nm 3 / h can be less than or equal to.

[0225] 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.

[0226] 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).

[0227] 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.

[0228]

[0229] <(c) Washing stage>

[0230] If necessary, a washing step may be performed on the lyocell multifilaments after the coagulation and multifilament steps described above. This washing step may remove any remaining NMMO and / or other impurities within the filaments.

[0231] 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.

[0232] The components of the washing liquid are not particularly limited. For example, the washing liquid may contain water and may also contain known additives.

[0233] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0234]

[0235] <(d) Milk processing stage>

[0236] 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.

[0237] 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.

[0238] 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.

[0239] In one example, the emulsion treatment may be performed so that the oil content (OPU: oil pick up ratio (wt%)) satisfies 1.0 wt% or more based on at least 100 wt% of the emulsion-treated lyocell multifilament. At this time, the emulsion-treated lyocell multifilament may be, for example, lyocell multifilament to which the lyocell material has been first emulsion-treated, lyocell multifilament to which the first emulsion-treated and second emulsion-treated (see description below) have been applied, or lyocell multifilament to which a binder, which will be described later, has been applied together with the emulsion-treated as described above. In addition, the lyocell multifilament to which the emulsion-treated and / or binder-treated as described above has been crimped.

[0240] In particular, the content of the emulsion in the at least emulsion-treated lyocell multifilament may be at least 0.5 wt%, at least 1.0 wt%, at least 1.5 wt%, at least 2.0 wt%, at least 2.5 wt%, at least 3.0 wt%, particularly at least 3.5 wt%, at least 4.0 wt%, at least 4.2 wt%, at least 4.5 wt%, at least 5.0 wt%, at least 5.5 wt%, at least 6.0 wt%, at least 6.5 wt%, at least 7.0 wt%, at least 7.5 wt%, at least 8.0 wt%, at least 8.5 wt%, at least 9.0 wt%, or at least 9.5 wt%, based on 100 wt% of the total of the emulsion-treated lyocell multifilament. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on 100 wt% of the total weight of the lyocell multifilament treated with the emulsion. At this time, the above content may mean the dry weight after the solvent (e.g., water) or liquid component that may be included in the emulsion has evaporated.

[0241] 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.

[0242] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0243] 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 9.44 dtex (1.5 to 8.5 denier). The single filament fineness refers to the fineness of one single monofilament separated from the multifilament.

[0244] The single fiber count of the above filament may be, in particular, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, in particular, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in implementing stable suction resistance and securing fairness of a filter for smoking articles.

[0245] 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.

[0246]

[0247] <(e) Crimp application step>

[0248] 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.

[0249] 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.

[0250] In one 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. In this case, a steam box may be used for supplying the steam, and the steam box may be located upstream of the crimping device.

[0251] In one example, the crimping step can be performed in such a way that the pressurization of the lyocell multifilament by the press roller and the application of steam are performed simultaneously.

[0252] In one example, the crimping step may 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.

[0253] In one example, the crimping step is performed on the lyocell multifilaments prior to feeding into the crimping device (particularly the press roller) at a pressure of 0.98 to 19.61 N / cm. 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying steam.

[0254] 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 may increase, which may cause excessive crimping of the filament within the crimping device, and may prevent it from passing through the crimping device.

[0255] In one example, the crimping step may be performed by pressing the lyocell multifilament with a press roller to form wrinkles in the lyocell multifilament. 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.

[0256] In one example, the crimping step is performed by applying a pressure of 14.71 to 39.23 N / cm to the lyocell multifilament fed into the crimping device using a press roller. 2 (1.5 to 4.0 kgf / cm 2 ) can be performed while applying pressure.

[0257] 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 / cm2 ) 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.

[0258] The pressure of the press roller is within the above range. If the pressure is less than the above range, the desired number of crimps may not be sufficiently formed. Furthermore, if the roller pressure exceeds the above range, the pressing force may be too strong, preventing the filaments from being smoothly fed into the crimping device or passing through the crimping device (e.g., stuffer box). Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0259] In one example, 0.1 to 2 kgf / cm2 of lyocell multifilament was used as the top plate. 2 Pressure may be applied to the lyocell multifilament. Additionally, the upper plate may apply pressure to the lyocell multifilament as it passes through or passes through the press roller.

[0260] 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.

[0261] 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 If it is less than (0.1 kgf / ㎠), the upper plate may not be fixed due to the pressure inside the crimp device (e.g., stuffer box), and the tow may remain inside the crimp device for a long time, preventing the continuity of the process from being maintained. If it is more than 2 kgf / ㎠, the steam may not be discharged smoothly inside the crimp device, causing the crimp shape to become irregular.

[0262] In one example, the crimping step may employ a doctor blade that applies a predetermined pressure to the lyocell multifilament. The doctor blade controls the residence time of the filaments fed into the crimping device (e.g., a stuffer box), thereby contributing to the control of the number of crimps. Such a doctor blade may be positioned, for example, in the path of the lyocell multifilaments that are pressed by the rollers described above and then discharged from the roller pressure point.

[0263] In one example, the crimping step uses a doctor blade to apply a pressure of 0.98 to 19.61 N / cm to the lyocell multifilaments passed through the rollers of the crimping device. 2 (0.1 to 2.0 kgf / cm 2 ) can be performed while applying pressure.

[0264] For example, the pressure applied by the doctor blade is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm2 (0.4 kgf / cm 2 ) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) The following pressures can be applied by the doctor blade.

[0265] In one example, the crimping step may be performed at a temperature ranging from 120 to 250°C. If the temperature is too low, the shape stabilization effect of the crimp may not be good, and if the temperature is too high, the concentration of the oil content in the crimping device (e.g., stuffer box) may increase, making crimp formation difficult. Therefore, considering the steam pressure described above, etc., the temperature may be appropriately controlled in 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.

[0266]

[0267] <(f) Binder processing step>

[0268] In one example, the method may further comprise a step of treating the lyocell multifilament obtained by the emulsion-treated or crimp-imparting step with a binder.

[0269] 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.

[0270] The method for coating the binder on the lyocell material is not particularly limited. For example, the emulsion treatment may be performed by immersing the lyocell multifilament in a bath filled with binder and / or binder solution so that the lyocell multifilament is completely submerged in the binder. Alternatively, the binder coating on the lyocell multifilament may be performed by spraying and / or atomizing the binder and / or binder solution using a nozzle. The types and components of the binder that can be used are the same as those described above, and therefore, description thereof is omitted.

[0271] In one example, the binder and / or binder solution may further include a solvent in addition to the above-described components. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin. When the binder and / or binder solution includes a solvent, the solvent content may be, for example, about 20 to 80 wt% or about 40 to 60 wt% based on 100 wt% of the total binder and / or binder solution.

[0272] 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.

[0273] 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.

[0274]

[0275] <(g) Other steps>

[0276] After crimping, additional appropriate post-processing may be performed.

[0277] In one example, a secondary emulsion treatment (g1) may be additionally performed. The secondary emulsion treatment may further impart flexibility to the tow. The secondary emulsion treatment may be performed in the same manner as or in accordance with the emulsion treatment step (d) described above.

[0278] In particular, secondary emulsion treatment can be performed by applying emulsion to lyocell tow that has undergone a crimping process. This can be beneficial in 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.

[0279] 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.

[0280] 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.

[0281] In one example, a drying process (g2) may be additionally performed. This drying process may be performed, for example, at a temperature ranging from 100 to 130°C. The drying process method or method is not particularly limited, and any known technique may be utilized. For example, this may be accomplished by applying hot air to the tow, passing the tow through a temperature-controlled room for a set period of time, or leaving the tow in that room.

[0282] The lyocell material according to the present invention can be obtained by the method for producing a lyocell material as described above.

[0283] The lyocell material according to the present invention may be a material obtainable by the method for producing a lyocell material as described above.

[0284]

[0285] [Smoking items]

[0286] 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.

[0287] 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.

[0288] 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.

[0289] 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.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] 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.

[0294]

[0295] [Filter for smoking items]

[0296] Lyocell material can be used in filters for smoking articles. The lyocell material may be lyocell tow. In one example, the lyocell tow includes crimped lyocell multifilament.

[0297] 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.

[0298] 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.

[0299] In one example, the single fiber count of the filaments forming the lyocell multifilament may be 1.67 to 9.44 dtex (1.5 to 8.5 denier). The specific values ​​are the same as those described above.

[0300] In one example, the crimped lyocell multifilament may be a lyocell material having a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier), and preferably, the lyocell material may be lyocell tow. The specific values ​​are the same as those described above.

[0301] In one example, the crimped lyocell multifilament may have crimps of 3.94 to 19.69 per centimeter (10 to 50 per inch). The specific values ​​are the same as those described above.

[0302] In one example, the above-described smoking article filter may further include a binder on the surface of the crimped lyocell multifilament or between the crimped lyocell multifilaments. The binder increases the hardness of the tow-made smoking article filter, thereby preventing problems such as filter jamming during the filter manufacturing process or the cigarette manufacturing process. The description of the types, components, and contents of usable binders is the same as described above.

[0303] In one example, the filter for the smoking article may further include a wrapping paper (which may be referred to as a wrapping paper, a filter paper, or a filter wrapping paper). For example, the wrapping paper may be porous paper or non-porous paper that wraps the lyocell tow described above and can maintain the filter shape (e.g., a cylinder or a cylindrical shape).

[0304] In a specific example of the present application, the filter for the smoking article may have a predetermined shape and size.

[0305] For example, the filter may have a rod shape. In particular, the filter for the smoking article may have a cylindrical shape.

[0306] 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.

[0307] 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.

[0308] In one example, the filter for the smoking article may include lyocell tow and filter paper. The description of the lyocell tow and filter paper is the same as described above, and thus is omitted.

[0309] 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).

[0310] In one example, when a porous paper is used, the paper may have a porosity of 10 to 50,000 CU (Coresta Unit). A Coresta Unit is 1 cm at a pressure difference of 1 kPa. 2 The volume flow rate (cm) of air passing through the substrate sample (i.e., porous paper) 3 min -1) can be defined. In particular, the lower limit of the porosity of the 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.

[0311] In one example, the weight of the above paper is 15 to 60 g / cm 2　 It can be. In particular, the lower limit of the basis weight of the above-mentioned paper is, for example, 20 g / cm 2 Above, 25 g / cm 2 Above, 30 g / cm 2 Above, 35 g / cm 2 Above, 40 g / cm 2 Above, 45 g / cm 2 Above, 50 g / cm 2 or more than 55 g / cm 2 It can be ideal, and the upper limit is, for example, 55 g / cm 2 Below 50 g / cm 2 Below 45 g / cm 2 Below 40 g / cm 2 Below 35 g / cm 2 Below 30 g / cm 2 Below 25 g / cm 2 Less than or equal to 20 g / cm 2 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:

[0312] 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.

[0313] Descriptions of other smoking articles filters and materials included therein are the same as those described above, so they are omitted.

[0314]

[0315] [Method for manufacturing filters for smoking articles]

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] Preferably, the lyocell material used in the manufacture of filters for smoking articles may be lyocell tow.

[0321] 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.

[0322]

[0323] 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 spinning dope with controlled complex viscosity and a lyocell material using the same with good orientation and spinnability are provided.

[0324]

[0325] 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.

[0326]

[0327] 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.

[0328]

[0329] [Manufacturing example]

[0330] Cellulose pulp with a degree of polymerization (DPw) of 820 and an alpha-cellulose content of 93.9% was fed into a side feeder, and a NMMO / H2O solvent with a propyl gallate content of 0.01 wt% was added to perform premixing. The temperature of the side feeder was maintained at 90°C, and the premixing residence time of the cellulose pulp and the solvent was controlled to within 1 second. Thus, a dope in which the cellulose pulp and the solvent were appropriately mixed was prepared, and the dope was fed into an extruder. The temperature of the extruder was set and operated at 90°C to 100°C, and a spinning dope with a complex viscosity of 14.6 Pa·s (@20 rad / s) was produced.

[0331] Thereafter, while the radiation temperature was maintained at 110°C, the discharge amount and radiation speed were appropriately adjusted, and the dope for radiation was radiated from the radiation nozzle. The radiation speed was 230 m / min, and the draft ratio of the radiation was 16.2.

[0332] The filament-phase spinning dope discharged from the spinneret was supplied to the coagulating liquid (containing 75 wt% of water and 25 wt% of NMMO based on 100 wt% of the total coagulating liquid, and having a temperature of approximately 25°C) in the coagulating tank through the air gap section. At this time, the cooling air in the air gap section primarily coagulates the spinning dope at a temperature of 9.5°C and an air flow rate of 200 N㎥ / h. In addition, the concentration of the coagulating liquid was continuously monitored using a sensor and a refractometer.

[0333] 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.

[0334] The filament is fed to a nip roll installed in the bath discharge section at 19.61 N / cm 2 (2 kgf / ㎠) pressure and put into a crimp machine to give wrinkles. In particular, the pressure of the press roller was 24.52 N / cm 2 (2.5 kgf / ㎠), and the pressure of the doctor blade is 4.90 N / cm 2 The tow was manufactured by setting it to (0.5 kgf / ㎠).

[0335] 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.

[0336]

[0337] The manufactured tow has a single fiber count of 1.67 to 9.44 dtex (1.5 to 8.5 denier), a total fiber count of 3,333 to 5,000 tex (30,000 to 45,000 denier), and a crimp count of 5.91 to 15.75 ea / cm (15 to 40 ea / inch).

[0338]

[0339] [Example]

[0340] Example 1

[0341] The lyocell material of Example 1 was manufactured according to the manufacturing example.

[0342]

[0343] Examples 2 to 15

[0344] Lyocell material was manufactured according to the manufacturing example, and the complex viscosity of the spinning dope and spinning conditions were as shown in Table 1 below.

[0345]

[0346] Comparative Examples 1 to 5

[0347] Lyocell material was manufactured according to the manufacturing example, and the complex viscosity of the spinning dope and spinning conditions were as shown in Table 1 below.

[0348] In Comparative Examples 1 to 3, continuous and uniform production of lyocell multifilament was limited due to entanglement and breakage of lyocell monofilament during the spinning step.

[0349] In Comparative Examples 4 and 5, the discharge holes formed in the spinneret were partially blocked by the radiation dope. As a result, continuous spinning of the lyocell multifilament was restricted.

[0350]

[0351] Complex viscosity of the dope for radiation (Pa·s@20rad / s) Radiation temperature (℃) Temperature of draft uncooled air (℃) Example 1 15.6 110 16.29.5 2 15.6 110 8.39.5 3 15.6 110 12.29.5 4 15.6 110 2.5 9.5 5 69.4 113 23.39.0 6 69.4 113 14.09.0 7 69.4 113 8.99.0 8 69.4 113 5.39.0 9 10 5.7 115 25.19.0 10 105.7 115 15.09.0 11105.71159.69.012105.71155.69.013175.911824.79.014175.911812.69.015175.91187.49.0Comparative Example 19.511016.29.029.51058.39.039.51002.39.04203.512029.19.05203.51252.39.0

[0352]

[0353] Referring to Comparative Examples 1 to 3 in Table 1, it is confirmed that entanglement and breakage of monofilaments during the spinning process are caused by the low complex viscosity of the spinning dope, particularly a complex viscosity of less than 10 Pa·s.

[0354] In addition, referring to Comparative Examples 4 to 5 in Table 1, it is confirmed that the blockage of the discharge port during the radiation process is caused by the excessive complex viscosity of the radiation dope, particularly a complex viscosity exceeding 200 Pa·s.

[0355]

[0356] Experiment 1: Evaluation of tensile strength and breaking elongation of lyocell material

[0357] The tensile strength and breaking elongation of the monofilaments made of lyocell material according to each example and comparative example were measured using an Instron low-speed extension tensile tester. In particular, the tensile speed was 60 mm / min. Prior to measurement, the specimens collected from the lyocell material were pre-dried at 110°C for 2 hours and left in a standard environment compliant with KS K 0901 for more than 24 hours.

[0358] In Examples 1 to 15, the production of lyocell material could be continuously achieved without entanglement or breakage of the monofilament. In contrast, in Comparative Examples 1 to 3, more than 5 wt% of the yarn was generated, and thus the spinnability was evaluated as poor. In addition, in Comparative Examples 4 and 5, more than 5 wt% of the drips were generated, and thus the spinnability was evaluated as poor. As a result, the production of lyocell material from Comparative Examples 1 to 5 was limited.

[0359]

[0360] Tensile strength of monofilament (N / tex (gf / d)) Breaking elongation of monofilament (%)Example 1 Good 1.96 (1.76) 0.450 (5.10) 7.30 2 Good 3.84 (3.46) 0.371 (4.20) 5.20 3 Good 3.27 (2.94) 0.380 (4.30) 6.10 4 Good 8.92 (8.03) 0.290 (3.28) 5.44 5 Good 1.98 (1.78) 0.335 (3.80) 6.90 6 Good 3.49 (3.14) 0.371 (4.20) 7.10 7 Good 5.20 (4.68) 0.309 (3.50)6.508Good8.73 (7.86)0.353 (4.00)7.009Good1.99 (1.79)0.347 (3.93)7.3310Good3.32 (2.99)0.323 (3.66)7.2811Good5.18 (4.66)0.363 (4.11)5.2712Good8.86 (7.97)0.365 (4.14)5.5913Good2.70 (2.43)0.330 (3.74)6.5214Good5.31 (4.78)0.366 (4.15)5.7015Good9.02 (8.12)0.496 (5.62)3.90Comparison Example 1 Defective---2 Defective---3 Defective---4 Defective---5 Defective---

[0361]

[0362] Referring to Examples 1, 5, 9, and 13 of Table 2, it was confirmed that the lyocell material according to the examples includes monofilaments of finer fineness, and that each monofilament has excellent tensile strength and breaking elongation. For example, it was confirmed that the lyocell material of Example 1 has a fineness of 1.96 dtex (1.76 d), and its tensile strength and breaking elongation are high values ​​of 0.450 N / tex (5.10 gf / d) and 7.30%, respectively.

[0363] In addition, referring to Examples 1 to 15, the lyocell material according to the Examples can provide a fineness of monofilaments in a wide range, and as a result, a wide range of choices for the lyocell material can be provided in the process of manufacturing a filter for a smoking article including the lyocell material.

Claims

1. Contains cellulose pulp and NMMO (N-Methylmorpholine N-oxide), A dope for radiation having a complex viscosity of 10 Pa·s to 200 Pa·s.

2. In paragraph 1, The above cellulose pulp contains alpha-cellulose, A dope for spinning, wherein the content of alpha-cellulose is 85 wt% or more based on 100 wt% of the cellulose pulp.

3. In paragraph 2, The above cellulose pulp further contains hemicellulose, A dope for spinning, wherein the content of hemicellulose is less than 15 wt% based on 100 wt% of the cellulose pulp.

4. In paragraph 1, A spinning dope having a degree of polymerization (DPW) of the above cellulose pulp of 600 to 1700.

5. In paragraph 1, Include more water, A dope for radiation, wherein the water content is 5 to 20 parts by weight based on 100 parts by weight of NMMO and water.

6. In paragraph 1, The above complex viscosity is measured by vibrating the radiating dope at a frequency of 20 rad / s.

7. A lyocell material comprising lyocell multifilaments radiated using a radiant dope according to any one of claims 1 to 6.

8. In paragraph 7, The above Lyocell multifilament is a crimped Lyocell material.

9. In paragraph 8, Lyocell material, wherein the number of crimps is 10 ea / inch to 60 ea / inch.

10. In paragraph 7, Lyocell material having a tensile strength of 1.5 gf / d to 7.0 gf / d.

11. In paragraph 7, Lyocell material having a breaking strength of 2.0% to 10.0%.

12. In paragraph 7, Lyocell material having a single denier of the above Lyocell multifilament of 1.5 to 8.5 denier.

13. In paragraph 7, Lyocell material with a total denier of 15,000 to 55,000.

14. In paragraph 7, Lyocell towine, Lyocell material.

15. In paragraph 7, Lyocell material for filters for smoking articles.

16. A filter for a smoking article comprising a lyocell material according to any one of claims 7 to 15.

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

18. 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 lyocell dope spinning step is performed using a spinning dope containing cellulose pulp and NMMO (N-Methylmorpholine N-oxide), A method for manufacturing a lyocell material, wherein the complex viscosity of the above-mentioned radiation dope is 10 Pa·s to 200 Pa·s.

19. In Article 18, The above cellulose pulp contains alpha-cellulose, A method for producing a lyocell material, wherein the content of alpha-cellulose is 85 wt% or more based on 100 wt% of the cellulose pulp.

20. In paragraph 18, The above radiation dope further contains water, A method for manufacturing a lyocell material, wherein the water content is 5 to 20 parts by weight based on 100 parts by weight of NMMO and water.