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

Abstract

The present application relates to a lyocell material, a filter for smoking articles, comprising the lyocell material, and a smoking article. The lyocell material and the filter for smoking articles according to the present application can serve as alternatives to conventional cellulose acetate materials and filters including same for smoking articles.

Description

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

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

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

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

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

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

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

[0007] According to a specific example of the present application, a lyocell material, a filter including the same, a smoking article, etc. can be provided.

[0008] In particular, a lyocell material comprising crimped lyocell multifilaments and having a whiteness of 55 to 85 is provided.

[0009] Additionally, a filter for a smoking article comprising a lyocell material having a whiteness of 55 to 85 is provided.

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

[0011] According to another specific example of the present application, a method for manufacturing the lyocell material, a filter comprising the same, and a smoking article may be provided.

[0012]

[0013] In this specification, "smoking article" may refer to an article capable of generating an aerosol, such as a cigarette or cigar. In this regard, the smoking article may include an aerosol-generating material or an aerosol-forming substrate. Furthermore, the smoking article may include a solid material based on tobacco raw materials, such as tobacco leaf, tobacco ash, or reconstituted tobacco. Additionally, the smoking material may include volatile compounds.

[0014] Unless otherwise specifically defined herein, if the properties of lyocell materials, filters for smoking articles, and their related components or compositions are affected by temperature, the temperature at which the properties are determined or measured may be room temperature. In this case, room temperature refers to a temperature in a non-thermally or non-heated state, and may be, for example, a temperature of 10 to 35°C, particularly 15 to 35°C, 20 to 30°C, or about 25°C.

[0015] Hereinafter, the present invention will be described in more detail.

[0016]

[0017] 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.

[0018] 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.

[0019] 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.

[0020] As used herein, “lyocell tow” comprises or consists of at least one lyocell multifilament.

[0021] In the present specification, "whiteness" may refer to the degree to which a surface, particularly a surface of a lyocell material and / or a fractured lyocell material and / or a fractured surface, is white. "Whiteness" may refer to whiteness according to CIE D65-10 and / or CIE whiteness and / or CIE whiteness index. Whiteness may be measured spectrophotometrically. In particular, whiteness may be measured using a CCM device. Although not particularly limited, a ColorEye 7000A Spectrophotometer from X-Rite may be used as the CCM device.

[0022] In this specification, "brightness" can represent how much light a material and / or sheet of material reflects on a scale of 0 to 100. In particular, this light can have a wavelength of 460 nm. In some embodiments, "brightness" represents the brightness of paper. The brightness can be a value measured spectrophotometrically for a light source having a wavelength of 460 nm. In particular, the brightness can be measured using a CCM device. Although not particularly limited, the ColorEye 7000A Spectrophotometer from X-Rite can be used as the CCM device.

[0023] In this specification, the "broken portion of the broken lyocell material" may refer to an overlapping portion after cutting three samples of lyocell material having a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier) in a direction perpendicular to the longitudinal direction of the lyocell material.

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

[0025] In this specification, “ppm” may represent weight percentage.

[0026] 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.

[0027] 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.

[0028] According to one aspect, a lyocell material is provided, which comprises crimped lyocell multifilaments and has a whiteness of 55 to 85.

[0029] In some embodiments, the whiteness may be a value measured from a fractured portion of the fractured lyocell material.

[0030] In some embodiments, the whiteness may be a value measured from the opened lyocell material.

[0031] In some embodiments, the whiteness may be a value measured from the lyocell material included in the filter for the smoking article.

[0032] In some embodiments, the brightness measured at a wavelength of 460 nm may be greater than 75.

[0033] In some embodiments, the brightness may be less than 90.

[0034] In some embodiments, the brightness may be a value measured from a fractured portion of the fractured lyocell material.

[0035] In some embodiments, the brightness may be a value measured from the opened lyocell material.

[0036] In some embodiments, the brightness may be a value measured from a lyocell material included in a filter for a smoking article.

[0037] In some embodiments, the lyocell material may further comprise hydrogen peroxide, the concentration of hydrogen peroxide being less than or equal to 1000 ppm based on the total weight of the lyocell material.

[0038] In some embodiments, the concentration of hydrogen peroxide may be greater than 50 ppm based on the total weight of the lyocell material.

[0039] In some embodiments, the concentration of hydrogen peroxide may be from 250 ppm to 700 ppm based on the total weight of the lyocell material.

[0040] In some embodiments, the concentration of hydrogen peroxide can be measured by redox titration.

[0041] In some embodiments, the concentration of hydrogen peroxide can be measured according to Equation 1 below.

[0042] [Formula 1]

[0043] Concentration of hydrogen peroxide (%) = 0.0017·V·F·D / S·100

[0044] In Equation 1, V is the titration amount (ml) of 0.1N potassium permanganate solution, F is the normality factor of 0.1N potassium permanganate solution, D is the dilution ratio of the hydrogen peroxide-containing solution extracted from the sample, which is 1, and S is the weight (g) of the sample.

[0045] In some embodiments, the lyocell material further comprises hydrogen peroxide, and has a brightness of 75 or greater as measured at a wavelength of 460 nm, and a concentration of hydrogen peroxide of 1000 ppm or less based on the total weight of the lyocell material.

[0046] In some embodiments, the number of crimps can be from 3.94 ea / cm to 19.69 ea / cm (10 ea / inch to 50 ea / inch).

[0047]

[0048] In some embodiments, the number of crimps can be from 9.84 ea / cm to 11.81 ea / cm (25 ea / inch to 30 ea / inch).

[0049] In some embodiments, the single fiber count of the lyocell multifilament may be from 1.67 to 8.89 dtex (1.5 to 8.0 denier).

[0050] In some embodiments, the lyocell material may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier).

[0051] In some embodiments, the lyocell material may be lyocell tow.

[0052] In some embodiments, the lyocell material may be a filter for a smoking article.

[0053] In some embodiments, lyocell material may be included in a filter for a smoking article.

[0054] According to one aspect, a filter for a smoking article is provided comprising a lyocell material having a whiteness of 55 to 85. In some embodiments, the lyocell material is a lyocell material according to the present invention.

[0055] In some embodiments, in a filter for a smoking article, the whiteness may be a value measured from a broken section of the broken lyocell material.

[0056] In some embodiments, in a filter for a smoking article, the lyocell material may have a brightness of 75 or greater as measured at a wavelength of 460 nm.

[0057] In some embodiments, in a filter for a smoking article, the brightness may be a value measured from a broken section of a broken lyocell material.

[0058] In some embodiments, in a filter for a smoking article, the lyocell material further comprises hydrogen peroxide, and the concentration of hydrogen peroxide may be 1000 ppm or less based on the total weight of the lyocell material.

[0059] In some embodiments, in a filter for a smoking article, the concentration of hydrogen peroxide may be greater than or equal to 50 ppm based on the total weight of the lyocell material.

[0060] In some embodiments, in the filter for a smoking article, the concentration of hydrogen peroxide may be from 250 ppm to 700 ppm based on the total weight of the lyocell material.

[0061] According to another aspect, a smoking article is provided comprising any one of the filters for smoking articles according to the present invention.

[0062] According to another aspect, 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; a bleaching treatment step; and a crimping step; wherein in the bleaching treatment step, transportation of the lyocell multifilament is performed by one or more upper rollers and one or more lower rollers.

[0063] The crimping step may be referred to as the crimping step.

[0064] In some embodiments, in the method for manufacturing a lyocell material, the number of lower rollers may be two or more.

[0065] In some embodiments, in the method for manufacturing a lyocell material, the number of lower rollers may be eight or less.

[0066] In some embodiments, in the method for manufacturing a lyocell material, the lyocell multifilaments may be impregnated in a bleaching solution two or more times in the bleaching treatment step.

[0067] In some embodiments, in the method for manufacturing a lyocell material, the lyocell multifilament may be impregnated in the bleaching solution up to eight times in the bleaching treatment step.

[0068] In some embodiments, in the method for manufacturing lyocell material, the temperature of the bleaching solution may be from 30°C to 110°C.

[0069] In some embodiments, the method for manufacturing a lyocell material may have an impregnation time per lower roller of less than 0.54 seconds.

[0070] In some embodiments, the method for manufacturing a lyocell material further comprises an emulsion treatment step, wherein the emulsion treatment step may be performed before the bleaching treatment step, after the bleaching treatment step, or simultaneously with the bleaching treatment step.

[0071] In some embodiments, in the method for manufacturing a lyocell material, the emulsion treatment step may be performed after the washing step.

[0072] In some embodiments, in the method for manufacturing a lyocell material, the emulsion treatment step may be performed before the crimping step.

[0073] In some embodiments, in the method for manufacturing lyocell material, the emulsion treatment step may be performed in a separate treatment tank from the bleaching treatment step. In particular, the emulsion treatment step may be performed in a separate treatment tank from the treatment tank in which the bleaching treatment step is performed.

[0074] In some embodiments, in the method for manufacturing lyocell material, the emulsion treatment step may be performed in the same treatment tank as the bleaching treatment step.

[0075] In some embodiments, in the method for manufacturing a lyocell material, the emulsion treatment step is performed in the same treatment tank as the bleaching treatment step, and the emulsion treatment step can be performed simultaneously with the bleaching treatment step.

[0076]

[0077] In some embodiments, the lyocell material has a whiteness of 55 to 85 and a brightness of 75 or more measured at a wavelength of 460 nm. In addition, the content of H2O2 included in the lyocell material (i.e., the residual amount of H2O2) may be 50 ppm to 700 ppm based on the total weight of the lyocell material. As a result, consumer preference for color may be improved, and an off-flavor may not be generated from the lyocell material. Furthermore, by including the lyocell material, consumer satisfaction with the experience of using the filter for a smoking article may be improved.

[0078] Meanwhile, in order to manufacture a lyocell material having a whiteness of 55 to 85 and a brightness of 75 or more measured at a wavelength of 460 nm, transportation of the lyocell multifilaments in the bleaching treatment step is performed by one or more upper rollers and one or more lower rollers. The upper rollers are arranged so as not to be impregnated with the bleaching solution and / or so as not to impregnate the lyocell multifilaments and / or so as not to be immersed in the bleaching solution, and the lower rollers are arranged so as to be impregnated with the bleaching solution. In particular, the number of lower rollers may be two or more and eight or less.

[0079] When lyocell multifilaments are transported only by the lower rollers in or through the bleaching solution and / or the immersion time per lower roller is more than 0.54 seconds, the lyocell multifilaments experience excessive resistance due to the bleaching solution during transport. As a result, the lyocell multifilaments are pressed in the transporting direction and are stretched in a direction perpendicular to the transporting direction (i.e., in the width direction). The lyocell multifilaments stretched in the width direction are not crimped uniformly due to the increase in width and the decrease in edge density. In particular, edge bursting may be observed in the lyocell multifilaments stretched in the width direction after the crimping step, and the fairness of the crimping step may be compromised.

[0080]

[0081] [Irregular cross-section]

[0082] 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.

[0083] The outline of the heteromorphic cross-section may be tangent to an imaginary first circle and an imaginary second circle, respectively. Furthermore, the imaginary second circle may be depicted within the imaginary first circle, and / or the imaginary second circle may be within the imaginary first circle. The "imaginary first circle" may also be referred to as an "imaginary circumcircle" and / or a "circumcircle," and / or the "imaginary second circle" may also be referred to as an "imaginary incircle" and / or an "incircle."

[0084] 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.

[0085] 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.

[0086] The heterogeneous cross-section may be 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 virtual second circle as the center, and their ends are in contact with the virtual first circle.

[0087] The heteromorphism of a monofilament can be defined by the following mathematical equation 1.

[0088] <Mathematical Formula 1>

[0089] Lee Hyung-do = r1 / r2

[0090] Here, r1 is the radius of the virtual first circle, and r2 is the radius of the virtual second circle.

[0091] 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.

[0092] Additionally, the space occupancy of the monofilament can be defined by mathematical expression 2.

[0093] <Mathematical Formula 2>

[0094] Space occupancy = (S1 / S2) Х 100(%)

[0095] 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.

[0096] For example, the space occupancy of a monofilament having a heterogeneous cross-section can be 120 to 600%.

[0097]

[0098] [Island]

[0099] 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.

[0100] In some embodiments, the single filament count of the filaments forming the lyocell multifilament may be 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament count refers to the fineness of one single monofilament separated from the multifilament.

[0101] In particular, the single fiber count of the filament may be, for example, 8.33 dtex (7.5 denier) or less, 7.78 dtex (7.0 denier) or less, 7.22 dtex (6.5 denier) or less, 6.67 dtex (6.0 denier) or less, 6.11 dtex (5.5 denier) or less, 5.56 dtex (5.0 denier) or less, 5.00 dtex (4.5 denier) or less, 3.89 dtex (3.5 denier) or less, 3.33 dtex (3.0 denier) or less, 2.78 dtex (2.5 denier) or less, or 2.22 dtex (2.0 denier) or less. And, the lower limit may be, for example, 2.22 dtex (2.0 denier) or more, 2.78 dtex (2.5 denier) or more, 3.33 dtex (3.0 denier) or more, 3.89 dtex (3.5 denier) or more, 4.44 dtex (4.0 denier) or more, 5.00 dtex (4.5 denier) or more, 5.56 dtex (5.0 denier) or more, 6.11 dtex (5.5 denier) or more, 6.67 dtex (6.0 denier) or more, 7.22 dtex (6.5 denier) or more, or 7.78 dtex (7.0 denier) or more. Satisfying the above range may be more advantageous in securing stable physical properties (e.g., hardness or implementation of suction resistance, etc.) and fairness of the filter for smoking articles.

[0102] In some embodiments, the lyocell multifilament may have a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier). For example, the lower limit of the total fineness is, for example, 1,778 tex (16,000 denier) or more, 1,833 tex (16,500 denier) or more, 1,889 tex (17,000 denier) or more, 1,944 tex (17,500 denier) or more, 2,000 tex (18,000 denier) or more, 2,056 tex (18,500 denier) or more, 2,111 tex (19,000 denier) or more, 2,167 tex (19,500 denier) or more, 2,222 tex (20,000 denier) or more, 2,278 tex (20,500 denier) or more, 2,333 tex (21,000 denier) or more, 2,389 21,500 denier (tex) or more, 2,444 tex (22,000 denier) or more, 2,500 tex (22,500 denier) or more, 2,556 tex (23,000 denier) or more, 2,611 tex (23,500 denier) or more, 2,667 tex (24,000 denier) or more, 2,722 tex (24,500 denier) or more, 2,778 tex (25,000 denier) or more, 2,833 tex (25,500 denier) or more, 2,889 tex (26,000 denier) or more, 2,944 tex (26,500 denier) or more, 3,000 tex (27,000 denier) or more, 3,056 tex (27,500 denier) or more, 3,111 tex (28,000 denier) or more, 3,167 tex (28,500 denier) or more, 3,222 tex (29,000 denier) or more, 3,287 tex (29,500 denier) or more, 3,333 tex (30,000 denier) or more, 3,389 tex (30,500 denier) or more, 3,444 tex (31,000 denier) or more, 3,500 tex (31,500 denier) or more, 3,556 tex (32,000 denier) or more, 3,611 tex (32,500 denier) or more, 3,667 tex (33,000 denier) or more, 3,722 tex (33,500 denier) or more, 3,778 tex (34,000 denier) or more, 3,833 tex (34,500 denier) or more, 3,889 tex (35,000 denier) or more, 3,944 tex (35,500 denier) or more, 4,000 tex (36,000 denier) or more, 4,056 tex (36,500 denier) or more, 4,111 tex (37,000 denier) or more, 4,167 tex (37,500 denier) or more, 4,222 tex (38,000 denier) or more, 4,278 tex (38,500 denier) or more, 4,333 tex (39,000 denier) or more, 4,389 tex (39,500 denier) or more, 4,444 tex (40,000 denier) or more, 4,500 tex (40,500 denier) or more, 4,556 tex (41,000 denier) or more, 4,611 tex (41,500 denier) or more, 4,667 tex (42,000 denier) or more, 4,722 tex (42,500 denier) or more, 4,778 tex (43,000 denier) or more, 4,833 tex (43,500 denier) or more, 4,889 tex (44,000 denier) or more, 4,944 tex (44,500 denier) or more, 5,000 tex (45,000 denier) or more, 5,056 tex (45,500 denier) or more, 5,111 tex (46,000 denier) or more, 5,167 tex (46,500 denier) or more, 5,222 tex (47,000 denier) or more, 5,278 tex (47,500 denier) or more, 5,333 tex (48,000 denier) or more, 5,389 tex (48,500 denier) or more, 5,444 tex (49,000 denier) or more, 5,500 tex (49,500 denier) or more, 5,556 tex (50,000 denier) or more, 5,611 tex (50,500 denier) or more, 5,667 tex (51,000 denier) or more, 5,722 tex (51,500 denier) or more, 5,778 tex (52,000 denier) or more, 5,833 tex (52,500 denier) or more, 5,889 tex (53,000 denier) or more, 5,944 tex (53,500 denier) or more, 6,000 tex (54,000 denier) or more, or 6,056 tex (54,500 denier) or more. And, the upper limit is, for example, 6,056 tex (54,500 denier) or less, 6,000 tex (54,000 denier) or less, 5,944 tex (53,500 denier) or less, 5,889 tex (53,000 denier) or less, 5,833 tex (52,500 denier) or less, 5,778 tex (52,000 denier) or less, 5,722 tex (51,500 denier) or less, 5,667 tex (51,000 denier) or less, 5,611 tex (50,500 denier) or less, 5,556 tex (50,000 denier) or less, 5,500 tex (49,500 denier) or less, 5,444 tex (49,000 denier) or less, 5,389 tex (48,500 denier) or less, 5,333 tex (48,000 denier) or less, 5,278 tex (47,500 denier) or less, 5,222 tex (47,000 denier) or less, 5,167 tex (46,500 denier) or less, 5,111 tex (46,000 denier) or less, 5,056 tex (45,500 denier) or less, 5,000 tex (45,000 denier) or less, 4,944 tex (44,500 denier) or less, 4,889 tex (44,000 denier) or less, 4,833 tex (43,500 denier) or less, 4,778 tex (43,000 denier) or less, 4,722 tex (42,500 denier) or less, 4,667 tex (42,000 denier) or less, 4,611 tex (41,500 denier) or less, 4,556 tex (41,000 denier) or less, 4,500 tex (40,500 denier) or less, 4,444 tex (40,000 denier) or less, 4,389 tex (39,500 denier) or less, 4,333 tex (39,000 denier) or less,4,278 tex (38,500 denier) or less, 4,222 tex (38,000 denier) or less, 4,167 tex (37,500 denier) or less, 4,111 tex (37,000 denier) or less, 4,056 tex (36,500 denier) or less, 4,000 tex (36,000 denier) or less, 3,944 tex (35,500 denier) or less, 3,889 tex (35,000 denier) or less, 3,833 tex (34,500 denier) or less, 3,778 tex (34,000 denier) or less, 3,722 tex (33,500 denier) or less, 3,667 tex (33,000 denier) or less, 3,611 tex (32,500 denier) or less, 3,556 tex (32,000 denier) or less, 3,500 tex (31,500 denier) or less, 3,444 tex (31,000 denier) or less, 3,389 tex (30,500 denier) or less, 3,333 tex (30,000 denier) or less, 3,278 tex (29,500 denier) or less, 3,222 tex (29,000 denier) or less, 3,167 tex (28,500 denier) or less, 3,111 tex (28,000 denier) or less, 3,056 tex (27,500 denier) or less, 3,000 tex (27,000 denier) or less, 2,944 tex (26,500 denier) or less, 2,889 tex (26,000 denier) or less, 2,833 tex (25,500 denier) or less, 2,778 tex (25,000 denier) or less, 2,722 tex (24,500 denier) or less, 2,667 tex (24,000 denier) or less, 2,611 tex (23,500 denier) or less, 2,556 tex (23,000 denier) or less, 2,500 tex (22,500 denier) or less, 2,444 tex (22,000 denier) or less, 2,389 tex (21,500 denier) or less, 2,333 tex (21,000 denier) or less, 2,278 tex (20,500 denier) or less, 2,222 tex (20,000 denier) or less, 2,It may be 167 tex (19,500 denier) or less, 2,111 tex (19,000 denier) or less, 2,056 tex (18,500 denier) or less, 2,000 tex (18,000 denier) or less, 1,944 tex (17,500 denier) or less, 1,889 tex (17,000 denier) or less, 1,833 tex (16,500 denier) or less, 1,778 tex (16,000 denier) or less, or 1,722 tex (15,500 denier) or less. If the total fineness is outside the above range, the process for manufacturing a filter for smoking articles may not be good (continuous process is not possible due to cutting), and if the amount of tow filled in the filter paper during manufacturing of a filter for smoking articles is too small or too large, it may be difficult to secure sufficient filter properties (e.g., hardness or suction resistance, etc.).

[0103] The method for measuring fineness is not particularly limited, but for example, take a 2 m sample of the lyocell material to be measured, for example, lyocell tow, and leave it in a room that is kept at a constant temperature and humidity of 20℃ and 65% for 24 hours to stabilize. Fix one end of the stabilized lyocell tow, and attach a weight with a load of 2 kg to the other end. After maintaining the tow in a state of being extended by the load (stabilization) for 5 seconds, cut it into 90 cm to obtain a sample, and measure the weight of the sample (total fineness). The fineness is converted into a denier scale according to the denier conversion method, and the measured weight X 10000. When the total fineness is divided by the number of strands of monofilament in the sample, the single fineness of the monofilament in the sample is calculated.

[0104] 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.

[0105]

[0106] [Number of crimps]

[0107] In some embodiments, the lyocell multifilament may have crimps of 3.94 to 19.69 per centimeter (10 to 50 per inch). For example, the lower limit of the number of crimps may be 5.91 ea / cm (15 ea / inch) or more, 7.87 ea / cm (20 ea / inch) or more, 9.84 ea / cm (25 ea / inch) or more, 11.81 ea / cm (30 ea / inch) or more, 13.78 ea / cm (35 ea / inch) or more, 15.75 ea / cm (40 ea / inch) or more, or 17.72 ea / cm (45 ea / inch) or more, 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 It may be less than 9.84 ea / cm (25 ea / inch). The number of crimps and their uniformity can be controlled through pressure and temperature conditions, etc., for the crimping step described below.

[0108] Although not particularly limited, the number of crimps can be measured, for example, using a single-fiber material property evaluation device (e.g., Favimat). In particular, a manufactured lyocell material (preferably lyocell tow) sample can be left and stabilized for 24 hours under conditions of a temperature of 20±2℃ and a humidity of 65±4%. A sample can be collected from the stabilized sample without damaging the crimp. The collected sample can be mounted on a dedicated jig with a length (gauge length) of 10 to 30 mm. The initial load during measurement can be 0.05 g / de, and the crimp sensitivity can be 0.01 mm. The number of crimps can be measured under the conditions described above, that is, a temperature of 20±2℃ and a humidity of 65±4%.

[0109] 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.

[0110]

[0111] [bookbinder]

[0112] 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).

[0113] 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.

[0114] In one non-limiting example, the binder may include a polyester-based binder, a cellulosic-based binder, and / or a vinyl-based binder.

[0115] 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.

[0116] Cellulosic binders that may be used include, but are not limited to, hydroxypropylmethylcellulose (HPMC), ethylcellulose (EC), and / or methylcellulose (MC), carboxymethylcellulose (CMC), or combinations thereof.

[0117] In some embodiments, the cellulose-based binder is selected from the group consisting of hydroxypropylmethylcellulose, ethylcellulose, methylcellulose, carboxymethylcellulose, and combinations thereof.

[0118] 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), or combinations thereof.

[0119] In some embodiments, the vinyl binder is selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, ethylene vinyl acetate, and combinations thereof.

[0120] The method of applying and / or coating the above binder to the lyocell material is described below.

[0121]

[0122] [bleach solution]

[0123] The above lyocell material comprises crimped lyocell multifilaments and has a whiteness of 55 to 85. To satisfy the above whiteness, the lyocell multifilaments and / or the lyocell material may be bleached with a bleaching solution.

[0124] The bleaching solution may include a bleaching component and / or a bleaching agent and a solvent to bleach the lyocell multifilament and / or lyocell material. Preferably, the bleaching component and / or bleaching agent may be hydrogen peroxide (H2O2). In addition, the solvent is suitable as long as it can dissolve hydrogen peroxide, and for example, purified water may be considered as the solvent. As used herein, "purified water" may refer to water that has been mechanically filtered or treated to remove impurities. In some embodiments, purified water refers to water containing impurities in an amount of 1000 ppm or less, preferably 100 ppm or less, and more preferably 10 ppm or less, based on the total weight of water. The purified water may be distilled water. The concentration of hydrogen peroxide may be 2% to 8% by weight based on the total weight of the bleaching solution. Preferably, the concentration of hydrogen peroxide may be from 3% to 8%, from 4% to 8%, from 5% to 8%, from 3% to 7%, from 3% to 6%, from 3% to 5%, from 4% to 7%, from 5% to 7%, or from 4% to 6%, by weight, relative to the total weight of the bleaching solution.

[0125] By ensuring that the concentration of hydrogen peroxide satisfies the above range, the whiteness of the lyocell multifilament can be improved, and the concentration of residual hydrogen peroxide can be appropriately controlled.

[0126] Meanwhile, the temperature of the bleaching solution may be 30°C to 110°C. Preferably, the upper limit of the temperature of the bleaching solution may be 110°C, 105°C, 100°C, 95°C, 90°C, 85°C, 80°C, 75°C, 70°C, 65°C, 60°C, 55°C, 50°C, 45°C, or 40°C, and the lower limit of the temperature of the bleaching solution may be 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, or 100°C.

[0127] By ensuring that the temperature of the bleaching solution satisfies the above range, bleaching of the lyocell multifilament and / or lyocell material can be achieved while suppressing the occurrence of odors due to bleaching, such as acid odor. As a result, the whiteness and sensory properties of the lyocell multifilament can be evenly improved.

[0128] Meanwhile, the bleaching solution may further include the emulsion described below. As a result, bleaching and emulsion treatment of the lyocell multifilament and / or lyocell material can be performed simultaneously.

[0129]

[0130] [emulsion]

[0131] 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.

[0132] 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.

[0133] In a specific example of the present application, the lyocell material may contain a predetermined amount of the emulsion. In this case, the amount of the emulsion may refer to OPU (wt%), which will be described later. "OPU" may refer to oil pick-up ratio. For example, the lyocell material may contain the emulsion in an amount of 0.1 wt% or more, based on 100 wt% of the total lyocell material. In particular, the content of the emulsion may be 0.5 wt% or more, 1.0 wt% or more, 1.5 wt% or more, 2.0 wt% or more, 2.5 wt% or more, 3.0 wt% or more, especially 3.5 wt% or more, 4.0 wt% or more, 4.2 wt% or more, 4.5 wt% or more, 5.0 wt% or more, 5.5 wt% or more, 6.0 wt% or more, 6.5 wt% or more, 7.0 wt% or more, 7.5 wt% or more, 8.0 wt% or more, 8.5 wt% or more, 9.0 wt% or more, or 9.5 wt% or more. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less.

[0134] 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 20-39 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.

[0135] Food

[0136] Content of emulsion by extrusion (OPU, % or wt%)

[0137] = {(Plate Weight B - Plate Weight A) / (Sample Weight)} x 100

[0138] 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.

[0139] In relation to the emulsion of the present application, component (a) is a compound that can function as a type of lubricant or oil, and may be a component harmless to the human body enough to be used in food. Component (a) provides lubrication to the fibers fed into the crimper. If the lubrication is insufficient, the lyocell may clump together and not be able to escape the crimper. If the lubrication is too high, crimping may not occur properly. The content of component (a) can be controlled, as described below, taking these functions into account.

[0140] With respect to the above component (a), the type of fatty acid having 16 or more carbon atoms forming it is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an ester compound that is harmless to the human body and can be used in food can be used.

[0141] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0142] Saturated fatty acids include, for example, palmitic acid (hexadecanoic acid, CH3(CH2) 14 COOH), margaric acid (heptadecanoic acid, CH3(CH2) 15COOH), stearic acid (octadecanoic acid, CH3(CH2) 16 COOH), nonadecylic acid (nonadecanoic acid, CH3(CH2) 17 COOH) or arachidic acid (eicosanoic acid, CH3(CH2) 18 Examples include COOH). However, the types of saturated fatty acids available are not limited to these.

[0143] 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 saturated fatty acids available are not limited to these.

[0144] 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.

[0145] 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.

[0146] 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 suitable for use in food may be used.

[0147] For example, it can be a saturated fatty alcohol or an unsaturated fatty alcohol, and they can have a linear or branched form.

[0148] In some embodiments, the carbon number of the aliphatic monohydric alcohol may be 1 to 40. In particular, the carbon number of the aliphatic monohydric alcohol may be, for example, 4 or more, 8 or more, 12 or more, 16 or more, or 20 or more.

[0149] Examples of the above-mentioned aliphatic monohydric alcohols include, but are not limited to, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol.

[0150] In some embodiments, the aliphatic monohydric alcohol is selected from the group consisting of methanol, ethanol, butanol, lauryl alcohol, isotridecanol, and stearyl alcohol.

[0151] In some embodiments of the present application, the component (a) may be an ester of isotridecanol and stearic acid (e.g., isotridecyl stearate). However, the type of component (a) that can be used is not limited thereto.

[0152] 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.

[0153] 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.

[0154] Since this component (b) has both hydrophilicity and hydrophobicity 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.

[0155] With respect to the above component (b), the type of fatty acid having 16 or more carbon atoms forming it is not particularly limited. Any fatty acid having 16 or more carbon atoms that can provide an ester compound that is harmless to the human body and can be used in food may be used.

[0156] For example, fatty acids having 16 or more carbon atoms may be saturated fatty acids and / or unsaturated fatty acids.

[0157] 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.

[0158] 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 saturated fatty acids available are not limited to these.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] (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.

[0163] In some embodiments, the emulsion may comprise 100 parts by weight of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) 20 to 60 parts by weight of an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms.

[0164] 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.

[0165] In some embodiments, 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 (a) component may be 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, 65 wt% or more, 70 wt% or more, or 75 wt% or more, based on 100 wt% of the total weight of the emulsion. And, the upper limit of the content may be, for example, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, or 45 wt% or less.

[0166] In some embodiments, the emulsion may comprise an excess of component (a).

[0167] In some embodiments, 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.

[0168] In some embodiments, the emulsion may be included in a bleaching solution, wherein the bleaching solution may include a bleaching ingredient and / or a bleaching agent, and a solvent.

[0169] The content of the emulsion is not particularly limited, but may be included in an amount equal to the remaining amount excluding the bleaching component and / or bleaching agent and the solvent from 100 wt% of the total bleaching solution. The content of the emulsion included in the bleaching solution (i.e., the total content of the remaining components excluding the bleaching component / bleaching agent and the solvent) may be, for example, 90 wt% or less, 85 wt% or less, 80 wt% or less, 75 wt% or less, 70 wt% or less, 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, 30 wt% or less, 25 wt% or less, or 20 wt% or less. And, the lower limit can be, for example, 0 wt% or more, 0.1 wt% or more, 0.5 wt% or more, 1 wt% or more, 5 wt% or more, 10 wt% or more, 15 wt% or more, 20 wt% or more, 25 wt% or more, 30 wt% or more, 35 wt% or more, 40 wt% or more, 45 wt% or more, 50 wt% or more, 55 wt% or more, 60 wt% or more, 65 wt% or more, 70 wt% or more, 75 wt% or more, 80 wt% or more, or 85 wt% or more.

[0170]

[0171] [Method for manufacturing lyocell material]

[0172] The present application relates to a method for manufacturing lyocell material. Through this method, lyocell material can be manufactured and used in smoking articles.

[0173] In particular, the method for manufacturing the lyocell material includes a lyocell dope spinning step; a coagulation and obtaining step of lyocell multifilament; a washing step; a bleaching step; and a crimping step. In addition, in the bleaching step, the transportation of the lyocell multifilament may be performed by one or more upper rollers and one or more lower rollers. In particular, the washing step refers to a step of washing (cleaning) the lyocell multifilament, the bleaching step refers to a step of bleaching the lyocell multifilament, and the crimping step refers to a step of applying crimp to the lyocell multifilament. In some embodiments, the steps are performed in the mentioned order.

[0174] Additionally, the method for manufacturing the lyocell material may further include an emulsion treatment step. For example, the emulsion treatment step may be performed before the bleaching step, after the bleaching step, or simultaneously with the bleaching step. If the emulsion treatment step is performed simultaneously with the bleaching step, the emulsion treatment step may be understood to be included in the bleaching step.

[0175] Additionally, the emulsion treatment step may be performed after the washing step or before the crimping step.

[0176] In addition, the method for manufacturing the above lyocell material may further include a binder treatment step and other steps.

[0177] In addition, 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. 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 as described above.

[0178] The above crimping step may be performed, for example, by applying steam and / or pressure to the lyocell multifilament.

[0179] A method for manufacturing a lyocell material according to a specific example of the present application 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.

[0180]

[0181] <(a) Lyocell dope radiation stage>

[0182] This step is a step of spinning a lyocell spinning dope containing lyocell cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0183] Commercially available cellulose acetate filters are identified as a major source of microplastics. However, the amine oxide solvents used in the production of lyocell fibers are recyclable and biodegrade upon disposal, and lyocell materials do not generate any pollutants during the production process. Furthermore, lyocell tow biodegrades and is removed within a relatively short period of time, making lyocell a more environmentally friendly material than cellulose acetate.

[0184] In some embodiments, the content of cellulose in the spinning dope may be 5 to 15 wt% based on 100 wt% of the total weight of the dope. If the content of cellulose is too low, it is difficult to implement the characteristics of the lyocell fiber, and if the content exceeds the above range, it is difficult to dissolve in the 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 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 the total weight of the spinning dope. The term "cellulose" may refer to "lyocell cellulose".

[0185] In some embodiments, the radiation dope may include an aqueous solution of N-methylmorpholine-N-oxide (NMMO). The aqueous solution may include, for example, a weight ratio of 80 to 95% of N-methylmorpholine-N-oxide and a weight ratio of 5 to 20% of water, taking into account the degree of dissolution of cellulose and the process temperature.

[0186] In some embodiments, 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.

[0187] In some embodiments, 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.

[0188] Additionally, in specific examples of the present application, the degree of polymerization (DPw) of the cellulose may be from 600 to 1700. In some embodiments, the degree of polymerization refers to the number of repeating units and / or monomers of the cellulose, alpha-cellulose, and / or hemicellulose within the cellulose pulp.

[0189] In the above-mentioned radiation step, the shape of the detention device for discharging the radiation dope is not particularly limited. For example, a donut-shaped radiation detention device may be used.

[0190] The nozzle temperature of the spinneret, particularly the spin temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the spinneret may vary depending on the spin temperature, which may impede ejection, the spin temperature may be, for example, between 100°C and 120°C or lower, or between 100°C and 110°C or lower.

[0191] In some embodiments, the step of spinning the above-described spinning dope may be performed under controlled spinning conditions so that the single filament fineness may be 1.67 to 8.89 dtex (1.5 to 8.0 denier) or less. For example, one or more spinning conditions among the discharge amount and spinning speed of the above-described spinning dope may be appropriately controlled so that the single filament fineness included in the lyocell material satisfies 1.67 to 8.89 dtex (1.5 to 8.0 denier). In this case, the single filament fineness refers to the fineness of a single monofilament separated from a multifilament.

[0192] 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.

[0193] The radiation dope discharged through the radiation detention can go through the coagulation step described below.

[0194]

[0195] <(b) Coagulation and multifilament production step>

[0196] In this step, the radiated lyocell radiant dope is coagulated, and lyocell multifilament can be obtained.

[0197] The above coagulation may be carried out in a manner in which the radiant dope comes into contact with air and / or a coagulating liquid.

[0198] In some embodiments, the coagulation may include a first coagulation step of supplying cooling air to the radiated lyocell dope; and a second coagulation step of introducing the first coagulated radiated dope into a coagulation solution to coagulate it.

[0199] According to the above-described solidification method, the lyocell dope discharged from the spinneret can be primarily solidified in the space (air gap section) between the spinneret and the solidification tank. For example, cooling air can be supplied from the inside of the spinneret to the outside of the spinneret from an air-cooling unit located inside the spinneret to the inside of the spinneret. Alternatively, primary solidification can be achieved by a so-called air quenching method or method known in the relevant field.

[0200] In some embodiments, the upper temperature limit of the cooling air used for primary coagulation may be, for example, 15°C or lower. In particular, the cooling air may be air having a temperature of 14°C or lower, 13°C or lower, 12°C or lower, 11°C or lower, or 10°C or lower. If the temperature exceeds the temperature, the air-induced coagulation of the radiation dope may not be sufficient, and the radiation-related processability may be poor.

[0201] 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.

[0202] The degree to which the cooling air is supplied can be controlled taking into account sufficient coagulation, spinning processability, and the influence on the physical properties of the filament. For example, 70 to 400 Nm 3 / h can be supplied to the radiation dope derived from the air volume. More particularly, the air volume is 100 Nm 3 / h or more, 150 Nm 3 / h or more, 200 Nm 3 / h or more or 250 Nm 3 / h or more, and the upper limit of the airflow is, for example, 350 Nm 3 / h or less, 300 Nm 3 / h or less, 250 Nm 3 / h or less, 200 Nm 3 / h or less or 150 Nm 3 / h can be less than or equal to.

[0203] 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.

[0204] The type of coagulant for the secondary coagulation step described above is not particularly limited. For example, the coagulant may include one or more of water and N-methylmorpholine-N-oxide (NMMO).

[0205] Although not particularly limited, when the coagulant contains water and NMMO, the content of water in the coagulant may be 60 to 90 wt% based on the total weight of the coagulant, and the content of NMMO may be 10 to 40 wt% based on the total weight of the coagulant. Alternatively, the coagulant may contain 70 to 80 wt% of water and 20 to 30 wt% of NMMO based on the total weight of the coagulant. The concentration of the coagulant may be controlled to be maintained during the manufacturing process using a sensor or the like.

[0206]

[0207] <(c) Washing stage>

[0208] If necessary, the lyocell multifilaments may be washed after the above-described coagulation and multifilament harvesting steps. This washing may remove any remaining NMMO and / or other impurities within the filaments.

[0209] 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.

[0210] The components of the washing liquid are not particularly limited. For example, the washing liquid may contain water and may also contain known additives.

[0211] In addition, considering reuse after washing, etc., the washing liquid may be used at a temperature adjusted to 100°C or lower.

[0212]

[0213] <(d) Bleaching treatment step>

[0214] In some embodiments, the method for manufacturing lyocell material includes a bleaching step. In the bleaching step, the lyocell multifilament may be bleached using a bleaching solution, thereby removing pigments and impurities contained in the lyocell multifilament. The bleaching solution is as described above.

[0215] A method for manufacturing a lyocell material is provided, wherein in a bleaching treatment step, transport of lyocell multifilaments is performed by at least one upper roller and at least one lower roller. The upper roller is arranged so as not to be impregnated with the bleaching solution, and / or so as not to be impregnated with the lyocell multifilaments, and / or so as not to be immersed in the bleaching solution, and the lower roller is arranged so as to be impregnated with the bleaching solution, and / or so as to be impregnated with the lyocell multifilaments, and / or so as to be immersed in the bleaching solution. In particular, the upper roller may be arranged at the top of a treatment tank containing the bleaching solution, and when viewed from above, the upper roller may appear to be arranged within the outer circumferential surface of the treatment tank.

[0216] Since the upper roller is not immersed in the bleaching solution, the lyocell multifilaments in the vicinity of the upper roller are temporarily separated from the bleaching solution. In addition, since the lower roller is immersed in the bleaching solution, the lyocell multifilaments in the vicinity of the lower roller are temporarily immersed in the bleaching solution.

[0217] Accordingly, by controlling the number of the upper rollers and the number of the lower rollers, the time for which the lyocell multifilament is impregnated in the bleaching solution can be controlled, and the degree to which the lyocell multifilament is pressurized by the bleaching solution can be controlled.

[0218] In a method for manufacturing a lyocell material according to some embodiments, the number of lower rollers may be two or more. Preferably, the lower limit of the number of lower rollers may be two, three, four, five, six, or seven, and the upper limit of the number of lower rollers may be three, four, five, six, or eight.

[0219] In a method for manufacturing a lyocell material according to some embodiments, the number of upper rollers may be two or more. Preferably, the lower limit of the number of upper rollers may be two, three, four, five, six, or seven, and the upper limit of the number of upper rollers may be three, four, five, six, or eight.

[0220] Additionally, the number of the lower rollers may be the same as the number of the upper rollers, may be one less than the number of the upper rollers, or may be one more than the number of the upper rollers.

[0221] Additionally, the upper roller and the lower roller may be arranged alternately. For example, the lyocell multifilament may be transported by the first upper roller, then by the first lower roller, and then by the second upper roller.

[0222] In a method for manufacturing a lyocell material according to some embodiments, the lyocell multifilament may be impregnated in a bleaching solution 2 to 8 times in the bleaching treatment step. Preferably, the lyocell multifilament may be impregnated in the bleaching solution 3 or more times, 4 or more times, 5 or more times, 6 or more times, or 7 or more times, and may be impregnated in the bleaching solution 8 or less times, 7 or less times, 6 or less times, 5 or less times, 4 or less times, or 3 or less times. The composition of the bleaching solution may be as described above.

[0223] In some embodiments of the method for manufacturing a lyocell material, the impregnation time per lower roller may be less than 0.54 seconds. In some embodiments, the impregnation time per lower roller may be from 0.10 to 0.53 seconds. If the impregnation time per lower roller is greater than 0.54 seconds, the lyocell multifilament may experience excessive resistance due to the bleaching solution during transportation. As a result, the lyocell multifilament is pressed in the transportation direction and stretched in a direction perpendicular to the transportation direction (i.e., in the width direction). The lyocell multifilament stretched in the width direction does not uniformly provide crimp due to the increase in width and the decrease in edge density. In particular, edge bursting may be observed in the lyocell multifilament stretched in the width direction after the crimping step, and the fairness of the crimping step may be compromised.

[0224] Additionally, the depth of the lower roller may be 100 mm to 850 mm. The depth may be the length from the surface of the bleaching solution to the center of the lower roller. By adjusting the depth, the impregnation time of the lyocell multifilament per lower roller is adjusted. For example, when the depth of the lower roller is increased, the impregnation time of the lyocell multifilament is increased.

[0225] Preferably, the lower limit of the depth may be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm, and the upper limit of the depth may be 850 mm, 800 mm, 750 mm, 700 mm, 650 mm, 600 mm, 550 mm, 500 mm, 450 mm, 400 mm, 350 mm or 300 mm.

[0226] Additionally, the diameter of the lower roller and the diameter of the upper roller may be independently from each other, 100 mm to 200 mm. In particular, the range of the diameters may be 110 mm to 200 mm, 120 mm to 200 mm, 130 mm to 200 mm, 140 mm to 200 mm, 150 mm to 200 mm, 100 mm to 190 mm, 100 mm to 180 mm, 100 mm to 170 mm, 100 mm to 160 mm, or 100 mm to 150 mm.

[0227] Additionally, the emulsion treatment step may be performed in the same treatment bath as the bleaching treatment step. In this case, the treatment bath may contain a bleaching solution and an emulsion, and the bleaching solution and the emulsion may be uniformly prepared as described above.

[0228] Meanwhile, the emulsion treatment step may be performed in a separate treatment tank from the bleaching treatment step. In this case, a treatment tank containing a bleaching solution and a treatment tank containing an emulsion may be prepared separately, and the bleaching solution and emulsion may be uniformly prepared as described above.

[0229] In a method for manufacturing a lyocell material according to some embodiments, the emulsion treatment step is performed in the same treatment tank as the bleaching treatment step, and the emulsion treatment step can be performed simultaneously with the bleaching treatment step.

[0230] For example, a bleaching solution having a concentration of 2% to 8% of hydrogen peroxide may be used in the bleaching treatment step. In some embodiments, the bleaching solution may contain hydrogen peroxide in a concentration of 2% to 8% by weight based on the total weight of the bleaching solution. The temperature of the bleaching solution may be 40°C to 100°C. A total of 2 to 8 lower rollers having a diameter of about 150 mm may be arranged inside the bleaching solution. Each lower roller may be equally spaced apart. In addition, the depth of the lower roller may be 150 mm to 300 mm. An upper roller may be arranged on top of the lower roller. The number of upper rollers may be one less than the number of lower rollers. Each upper roller may be equally spaced apart. When viewed from the side, the lower roller / upper roller / lower roller may be alternately arranged in the direction of travel of the lyocell multifilament.

[0231] By rotating each lower roller and each upper roller, the transport of the lyocell multifilament proceeds in one direction. In particular, the process of transporting and impregnating the lyocell multifilament into the bleaching solution by the rotation of the lower roller and transporting the lyocell multifilament out of the bleaching solution by the rotation of the upper roller is repeated.

[0232] When lyocell multifilament is immersed in a bleaching solution, the lyocell multifilament experiences resistance from transport and the bleaching solution. In particular, if resistance from the bleaching solution continues, the lyocell multifilament is unnecessarily stretched in the width direction. As a result, the lyocell multifilament is unable to be fed into the crimping device, or even if it is fed into the crimping device, the quality of the crimp provided deteriorates.

[0233] That is, in a typical case, improving the whiteness and brightness of lyocell multifilaments by bleaching leads to a deterioration of the crimp characteristics of the lyocell multifilaments. Therefore, from a technical standpoint, it has been limited to manufacture lyocell multifilaments that simultaneously satisfy a predetermined whiteness and a predetermined brightness while also having good crimp characteristics using conventional methods.

[0234] On the other hand, as described above, since the lower roller and the upper roller are alternately arranged so that the process of temporarily immersing the lyocell multifilament in the bleaching solution is repeated, the continuous exposure time of the lyocell multifilament to the bleaching solution is limited to, for example, less than 0.54 seconds, while the lyocell multifilament can be exposed to sufficient bleaching conditions. As a result, the lyocell multifilament can have a whiteness of 55 to 85, a brightness of 75 or more, and H2O2 of 1000 ppm or less based on the total weight of the lyocell material, without deterioration of the crimp characteristics (e.g., number of crimps, uniformity of crimps, etc.).

[0235]

[0236] <(e) Milk processing stage>

[0237] If necessary, the lyocell multifilament may be subjected to an emulsion treatment step. This step involves applying an emulsion containing the aforementioned ingredients to the surface of the filament. This emulsion treatment reduces friction on the filament and facilitates crimp formation 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.

[0238] 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.

[0239] 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.

[0240] In some embodiments, the emulsion treatment may be performed such that the oil content (OPU: oil pick up ratio (wt%)) is 1.0 wt% or more, based on at least 100 wt% of the emulsion-treated lyocell multifilament. In this case, the emulsion-treated lyocell multifilament may be, for example, a lyocell multifilament to which a primary emulsion treatment has been applied, a lyocell multifilament to which a primary emulsion treatment and a secondary emulsion treatment (see description below) have been applied, or a lyocell multifilament to which a binder, which will be described later, has been applied together with the emulsion treatment as described above. In addition, the lyocell multifilament to which the emulsion and / or binder treatment as described above has been applied may have crimp.

[0241] In particular, the content of the emulsion in the at least emulsion-treated lyocell multifilament may be at least 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 the total weight of the emulsion-treated lyocell multifilament. And, the upper limit may be, for example, 20.0 wt% or less, 18.0 wt% or less, 17.0 wt% or less, 16.0 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less, 10.5 wt% or less, 10 wt% or less, 9.5 wt% or less, 9.0 wt% or less, 8.5 wt% or less, 8.0 wt% or less, 7.8 wt% or less, or 7.6 wt% or less, based on the total weight of the lyocell multifilament that has been treated with the emulsion. In this case, the content may mean the dry weight after evaporation of a solvent (e.g., water) or a liquid component that may be included in the emulsion.

[0242] 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.

[0243] In some cases, drying of the emulsion may be performed after the emulsion treatment as described above.

[0244] In a specific example of the present application, one or more of the steps described above can be controlled so that the single filament fineness of the filament forming the lyocell multifilament can be 1.67 to 8.89 dtex (1.5 to 8.0 denier). The single filament fineness refers to the fineness of one single monofilament separated from the multifilament.

[0245] 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.

[0246] 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.

[0247]

[0248] <(f) Crimp application stage>

[0249] 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, "emulsion-treated" and "emulsified" may be used interchangeably.

[0250] 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.

[0251] In some embodiments, 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.

[0252] In some embodiments, the crimping step may be performed in such a way that the pressurization of the lyocell multifilament by the press roller and the steam application are performed simultaneously.

[0253] In some embodiments, 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.

[0254] In some embodiments, the crimping step is performed on the lyocell multifilaments prior to introduction 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.

[0255] For example, 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2 ) or more, 4.90 N / cm 2 (0.5 kgf / cm 2 ) or more or 5.88 N / cm 2 (0.6 kgf / cm 2 ) or more steam can be provided by a steam box. In addition, 14.71 N / cm 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2) below steam may be provided. If the steam supply amount or pressure is below the above-mentioned range, the crimp may not be formed smoothly. In addition, if it exceeds the above-mentioned range, the flexibility of the filament increases, and excessive crimping is applied to the filament within the crimp device, so that it may not pass through the crimp device.

[0256] In some embodiments, 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.

[0257] In some embodiments, the crimping step applies a pressure of 14.71 to 39.23 N / cm² (1.5 to 4.0 kgf / cm) to the lyocell multifilaments fed into the crimping device using a press roller. 2 ) can be performed while applying pressure.

[0258] For example, 15.69 N / cm 2 (1.6 kgf / cm 2 ) above, 16.67 N / cm 2 (1.7 kgf / cm 2 ) or more, 17.65 N / cm 2 (1.8 kgf / cm 2 ) above, 18.63 N / cm 2 (1.9 kgf / cm 2 ) above, 19.61 N / cm 2 (2.0 kgf / cm 2 ) or more, 20.60 N / cm 2 (2.1 kgf / cm 2 ) above, 21.58 N / cm 2 (2.2 kgf / cm 2 ) above, 22.56 N / cm 2 (2.3 kgf / cm 2) above, 23.54 N / cm 2 (2.4 kgf / cm 2 ) or more or 24.52 N / cm 2 (2.5 kgf / cm 2 ) or more pressure can be applied to the lyocell multifilament through the press roller. Also, 38.25 N / cm 2 (3.9 kgf / cm 2 ) below, 37.27 N / cm 2 (3.8 kgf / cm 2 ) below, 36.29 N / cm 2 (3.7 kgf / cm 2 ) below, 35.31 N / cm 2 (3.6 kgf / cm 2 ) below, 34.33 N / cm 2 (3.5 kgf / cm 2 ) below, 33.35 N / cm 2 (3.4 kgf / cm 2 ) below, 32.37 N / cm 2 (3.3 kgf / cm 2 ) below, 31.39 N / cm 2 (3.2 kgf / cm 2 ) below, 30.41 N / cm 2 (3.1 kgf / cm 2 ) below, 29.42 N / cm 2 (3.0 kgf / cm 2 ) below, 28.44 N / cm 2 (2.9 kgf / cm 2 ) below, 27.46 N / cm 2 (2.8 kgf / cm 2 ) below, 26.48 N / cm 2 (2.7 kgf / cm 2 ) or less, 25.50 N / cm 2 (2.6 kgf / cm 2 ) or less or 24.52 N / cm 2 (2.5 kgf / cm 2 ) The following pressure can be applied by the press roller.

[0259] The pressure of the press roller is within the above range. If the pressure is less than the above range, the desired number of crimps may not be sufficiently formed. Furthermore, if the roller pressure exceeds the above range, the pressing force may be too strong, preventing the filament from being smoothly fed into the crimping device or from passing through the crimping device. Wrinkles may form in the lyocell multifilament due to the press roller providing the above pressure.

[0260] In some embodiments, the top plate is used to apply pressure to the lyocell multifilament of 0.98 to 19.61 N / cm. 2 (0.1 to 2 kgf / cm 2 ) can be applied to the lyocell multifilament. Additionally, the upper plate can apply pressure to the lyocell multifilament as it passes through or passes through the press roller.

[0261] 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.

[0262] Furthermore, if the pressure of the upper plate, which moves up and down to provide uniform crimping after passing through the press roller, is less than 0.98 N / cm2 (0.1 kgf / cm2), the upper plate cannot be fixed due to the pressure inside the crimp device, and the tow remains inside the crimp device for a long time, preventing the continuity of the process from being maintained. If it exceeds 19.61 N / cm2 (2 kgf / cm2), the steam cannot be smoothly discharged inside the crimp device, which may result in an irregular crimp shape.

[0263] In some embodiments, the crimping step may employ a doctor blade that applies a predetermined pressure to the lyocell multifilament. The doctor blade controls the residence time of the filaments fed into the crimper device, thereby contributing to the control of the number of crimps. Such a doctor blade may be positioned, for example, in the path of the lyocell multifilaments as they are pressed by the rollers described above and then discharged from the roller pressure point.

[0264] In some embodiments, 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.

[0265] For example, the pressure applied by the doctor blade is 1.96 N / cm 2 (0.2 kgf / cm 2 ) or more, 2.94 N / cm 2 (0.3 kgf / cm 2 ) or more, 3.92 N / cm 2 (0.4 kgf / cm 2) or more, or 4.90 N / cm 2 (0.5 kgf / cm 2 ) may be more than 14.71 N / cm. Also, 2 (1.5 kgf / cm 2 ) below, 13.73 N / cm 2 (1.4 kgf / cm 2 ) or less, 12.75 N / cm 2 (1.3 kgf / cm 2 ) below, 11.77 N / cm 2 (1.2 kgf / cm 2 ) below, 10.79 N / cm 2 (1.1 kgf / cm 2 ) or less or 9.81 N / cm 2 (1.0 kgf / cm 2 ) The following pressures can be applied by the doctor blade.

[0266] In some embodiments, the crimping step may be performed at a temperature ranging from 120 to 250°C. If the temperature is too low, the shape stabilization effect of the crimp is not good, and if the temperature is too high, the concentration of the oil content in the crimping device may increase, making crimp formation difficult. Therefore, considering the steam pressure and the like described above, 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.

[0267]

[0268] <(g) Binder processing step>

[0269] In some embodiments, the method may further comprise the step of treating the lyocell multifilament obtained by the emulsion-treated or crimp-imparting step with a binder.

[0270] 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.

[0271] The method for coating the binder on the lyocell material is not particularly limited. For example, the emulsion treatment may be performed by immersing the lyocell multifilaments in a bath filled with binder and / or binder solution so that the lyocell multifilaments are completely immersed in the binder. Alternatively, the binder coating on the lyocell multifilaments may be performed by spraying and / or atomizing the binder and / or binder solution using a nozzle.

[0272] The types and components of available binders are as described above, so they are omitted.

[0273] In some embodiments, the binder and / or binder solution may further comprise a solvent in addition to the components described above. The solvent may include, but is not limited to, water, ethanol, propylene glycol, and / or glycerin. When the binder and / or binder solution comprises 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.

[0274] 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.

[0275] 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.

[0276]

[0277] <(h) Other steps>

[0278] After crimping, additional appropriate post-processing may be performed.

[0279] In some embodiments, a secondary emulsion treatment (h1) 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 (e) described above.

[0280] In particular, secondary emulsion treatment can be performed by applying emulsion to lyocell tow that has undergone a crimper process. This can be beneficial for various processes involved in the manufacture of filters for smoking articles. For example, secondary emulsion treatment can not only ensure that the fibers and filter are easily spreadable in air during the spreading process, but also limit fiber breakage during the drawing process.

[0281] 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.

[0282] 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.

[0283] In some embodiments, a drying process (h2) 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.

[0284]

[0285] In one aspect, the present invention provides a lyocell material obtained by the method for producing a lyocell material as described above.

[0286] In one aspect, the present invention provides a lyocell material obtainable by the method for producing a lyocell material as described above.

[0287]

[0288] [Smoking items]

[0289] 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.

[0290] For example, the lyocell material may be incorporated into a combustible cigarette. As another example, the lyocell material may be incorporated into a heated cigarette, and the heated cigarette may be used in conjunction with an aerosol generating device (not shown).

[0291] 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.

[0292] 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.

[0293] The above tobacco medium comprises a tobacco substance, and the tobacco substance comprises nicotine. In addition, the tobacco medium may additionally comprise an excipient.

[0294] 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.

[0295] 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.

[0296] 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.

[0297]

[0298] [Filter for smoking items]

[0299] Lyocell material can be used in a filter for a smoking article. In some embodiments, the whiteness of the Lyocell material can be from 55 to 85. Preferably, the lower limit of the whiteness can be 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, or 70, and the upper limit of the whiteness can be 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, or 71.

[0300] In some embodiments, the whiteness of the lyocell material is 55 to 85, 55 to 84, 55 to 83, 55 to 82, 55 to 81, 55 to 80, 55 to 79, 55 to 78, 55 to 77, 55 to 76, 55 to 75, 55 to 74, 55 to 73, 55 to 72, 55 to 71, 56 to 85, 56 to 84, 56 to 83, 56 to 82, 56 to 81, 56 to 80, 56 to 79, 56 to 78, 56 to 77, 56 to 76, 56 to 75, 56 to 74, 56 to 73, 56 to 72, 56 to 71, 57 to 85, 57 to 84, 57 to 83, 57 to 82, 57 to 81, 57 to 80, 57 to 79, 57 to 78, 57 to 77, 57 to 76, 57 to 75, 57 to 74, 57 to 73, 57 to 72, 57 to 71, 58 to 85, 58 to 84, 58 to 83, 58 to 82, 58 to 81, 58 to 80, 58 to 79, 58 to 78, 58 to 77, 58 to 76, 58 to 75, 58 to 74, 58 to 73, 58 to 72, 58 to 71, 59 to 85, 59 to 84, 59 to 83, 59 to 82, 59 to 81, 59 to 80, 59 to 79, 59 to 78, 59 to 77, 59 to 76, 59 to 75, 59 to 74, 59 to 73, 59 to 72, 59 to 71, 60 to 85, 60 to 84, 60 to 83, 60 to 82, 60 to 81, 60 to 80, 60 to 79, 60 to 78, 60 to 77, 60 to 76, 60 to 75, 60 to 74, 60 to 73, 60 to 72, 60 to 71, 61 to 85, 61 to 84, 61 to 83, 61 to 82, 61 to 81, 61 to 80, 61 to 79,61 to 78, 61 to 77, 61 to 76, 61 to 75, 61 to 74, 61 to 73, 61 to 72, 61 to 71, 62 to 85, 62 to 84, 62 to 83, 62 to 82, 62 to 81, 62 to 80, 62 to 79, 62 to 78, 62 to 77, 62 to 76, 62 to 75, 62 to 74, 62 to 73, 62 to 72, 62 to 71, 63 to 85, 63 to 84, 63 to 83, 63 to 82, 63 to 81, 63 to 80, 63 to 79, 63 78, 63 to 77, 63 to 76, 63 to 75, 63 to 74, 63 to 73, 63 to 72, 63 to 71, 64 to 85, 64 to 84, 64 to 83, 64 to 82, 64 to 81, 64 to 80, 64 to 79, 64 to 78, 64 to 77, 64 to 76, 64 to 75, 64 to 74, 64 to 73, 64 to 72, 64 to 71, 65 to 85, 65 to 84, 65 to 83, 65 to 82, 65 to 81, 65 to 80, 65 to 79, 65 to 78, 65 to 77, 65 to 76, 65 to 75, 65 to 74, 65 to 73, 65 to 72, 65 to 71, 66 to 85, 66 to 84, 66 to 83, 66 to 82, 66 to 81, 66 to 80, 66 to 79, 66 to 78, 66 to 77, 66 to 76, 66 to 75, 66 to 74, 66 to 73, 66 to 72, 66 to 71, 67 to 85, 67 to 84, 67 to 83, 67 to 82, 67 to 81, 67 to 80, 67 to 79, 67 to 78, 67 to 77, 67 to 76, 67 to 75, 67 to 74, 67 to 73, 67 to 72, 67 to 71, 68 to 85, 68 to 84,68 to 83, 68 to 82, 68 to 81, 68 to 80, 68 to 79, 68 to 78, 68 to 77, 68 to 76, 68 to 75, 68 to 74, 68 to 73, 68 to 72, 68 to 71, 69 to 85, 69 to 84, 69 to 83, 69 to 82, 69 to 81, 69 to 80, 69 to 79, 69 to 78, 69 to 77, 69 to 76, 69 to 75, 69 to 74, 69 to 73, 69 to 72, 69 to 71, 70 to 85, 70 to 84, 70 The whiteness may be in the range of 70 to 83, 70 to 82, 70 to 81, 70 to 80, 70 to 79, 70 to 78, 70 to 77, 70 to 76, 70 to 75, 70 to 74, 70 to 73, 70 to 72, or 70 to 71. When the lyocell material satisfies the range of whiteness, the taste and sensory properties of the filter for a smoking article including the lyocell material can be evenly improved.

[0301] Additionally, the whiteness may be a value measured from a fractured section of a fractured lyocell material. The fracture of the lyocell material may be performed by a mechanical method. For example, the fracture of the lyocell material may be performed by cutting three samples of lyocell material having a total fineness of 1,667 to 6,111 tex (15,000 to 55,000 denier) in a direction perpendicular to the length direction of the lyocell material and then overlapping them. The whiteness may be a value measured from a portion where the fracture surfaces of the fractured sections overlap.

[0302] Additionally, the whiteness may be a value measured from the opened lyocell material. In particular, the whiteness may be a value measured from the lyocell material included in the filter for a smoking article. In particular, the whiteness may be a value measured from the broken portion of the lyocell material included in the filter for a smoking article.

[0303] Additionally, the brightness of the lyocell material measured at a wavelength of 460 nm may be 75 or more and 90 or less. Preferably, the lower limit of the brightness may be 75, 76, 77, 78, 79, 80, or 81, and the upper limit of the brightness may be 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, or 76.

[0304] In some embodiments, the brightness is 75 to 90, 75 to 89, 75 to 88, 75 to 87, 75 to 86, 75 to 85, 75 to 84, 75 to 83, 75 to 82, 75 to 81, 75 to 80, 75 to 79, 75 to 78, 75 to 77, 75 to 76, 76 to 90, 76 to 89, 76 to 88, 76 to 87, 76 to 86, 76 to 85, 76 to 84, 76 to 83, 76 to 82, 76 to 81, 76 to 80, 76 to 79, 76 to 78, 76 to 77, 77 to 90, 77 to 89, 77 to 88, 77 to 87, 77 to 86, 77 to 85, 77 to 84, 77 to 83, 77 to 82, 77 to 81, 77 to 80, 77 to 79, 77 to 78, 78 to 90, 78 to 89, 78 to 88, 78 to 87, 78 to 86, 78 to 85, 78 to 84, 78 to 83, 78 to 82, 78 to 81, 78 to 80, 78 to 79, 79 to 90, 79 to 89, 79 to 88, 79 to 87, 79 to 86, 79 to 85, It may be 79 to 84, 79 to 83, 79 to 82, 79 to 81, 79 to 80, 80 to 90, 80 to 89, 80 to 88, 80 to 87, 80 to 86, 80 to 85, 80 to 84, 80 to 83, 80 to 82, 80 to 81, 81 to 90, 81 to 89, 81 to 88, 81 to 87, 81 to 86, 81 to 85, 81 to 84, 81 to 83, or 81 to 82.

[0305] Since the above lyocell material satisfies the above brightness range, the taste and sensory properties of a filter for a smoking article including the above lyocell material can be evenly improved.

[0306] Additionally, the brightness may be a value measured from a fractured portion of a fractured lyocell material. The fractured portion is as described above.

[0307] Additionally, the brightness may be a value measured from the opened lyocell material. In particular, the brightness may be a value measured from the lyocell material included in the filter for a smoking article. More particularly, the brightness may be a value measured from the broken portion of the lyocell material included in the filter for a smoking article.

[0308] Meanwhile, the whiteness and brightness of the lyocell material can be measured independently using CCM equipment. Although not particularly limited, the ColorEye 7000A Spectrophotometer from X-Rite can be used as the CCM equipment.

[0309] Additionally, the brightness may be a value measured for a light source with a wavelength of 460 nm. The whiteness may be a value measured in accordance with CIE D65-10. The whiteness and the brightness may be average values ​​independently of each other.

[0310] Preferably, in the lyocell material according to some embodiments, the brightness is 75 or more and the whiteness is 55 to 80, or the brightness is 75 or more and the whiteness is 55 to 75, or the brightness is 75 or more and the whiteness is 55 to 70, or the brightness is 76 or more and the whiteness is 55 to 80, or the brightness is 76 or more and the whiteness is 55 to 75, or the brightness is 76 or more and the whiteness is 55 to 70, or the brightness is 77 or more and the whiteness is 55 to 80, or the brightness is 77 or more and the whiteness is 55 to 75, or the brightness is 77 or more and the whiteness is 55 to 70, or the brightness is 78 or more and the whiteness is 55 to 80, or the brightness is 78 or more and the whiteness is 55 to 75, or the brightness is 78 or more and the whiteness is 55 to 70, or the brightness is The brightness may be 79 or more and the whiteness may be 55 to 80, or the brightness may be 79 or more and the whiteness may be 55 to 75, or the brightness may be 79 or more and the whiteness may be 55 to 70, or the brightness may be 80 or more and the whiteness may be 55 to 80, or the brightness may be 80 or more and the whiteness may be 55 to 70.

[0311] When lyocell material is processed to simultaneously increase brightness and whiteness of the lyocell material, chemical and / or physical modification of the lyocell multifilament and / or monofilament contained in the lyocell material may occur. On the other hand, by simultaneously satisfying the brightness range and whiteness range of the lyocell material as described above, minimization of chemical and / or physical modification of the lyocell multifilament and / or monofilament contained in the lyocell material and improvement of the usability of the lyocell material can be harmoniously achieved.

[0312] In addition, the lyocell material further contains hydrogen peroxide, and the concentration of hydrogen peroxide (i.e., residual amount) may be 1000 ppm or less and 50 ppm or more based on the total weight of the lyocell material. The upper limit of the concentration may be 1000 ppm, 950 ppm, 900 ppm, 850 ppm, 800 ppm, 750 ppm, 700 ppm, 650 ppm, 600 ppm, 550 ppm, 500 ppm or 450 ppm based on the total weight of the lyocell material, and the lower limit of the concentration may be 50 ppm, 100 ppm, 150 ppm, 200 ppm, 250 ppm, 300 ppm or 350 ppm based on the total weight of the lyocell material. By ensuring that the concentration of hydrogen peroxide contained in the lyocell material satisfies the above range, the taste and sensory properties of a filter for a smoking article containing the lyocell material can be evenly improved.

[0313] Meanwhile, the concentration of hydrogen peroxide may be measured by a redox titration method. In particular, the concentration of hydrogen peroxide may be measured according to the following equation 1.

[0314] [Formula 1]

[0315] Concentration of hydrogen peroxide (%) = 0.0017·V·F·D / S·100

[0316] In Equation 1, V is the titration amount (ml) of 0.1N potassium permanganate solution, F is the titration coefficient of 0.1N potassium permanganate solution, D is the dilution ratio of the hydrogen peroxide-containing solution extracted from the sample, which is 1, and S is the weight (g) of the sample.

[0317] Additionally, in some embodiments, the whiteness of the lyocell material may be 55 to 85, and at the same time, the brightness of the lyocell material measured at a wavelength of 460 nm may be 75 or more, and at the same time, the concentration of hydrogen peroxide contained in the lyocell material may be 1000 ppm or less based on the total weight of the lyocell material.

[0318] Additionally, the lyocell material may be lyocell tow. In some embodiments, the lyocell tow comprises crimped lyocell multifilament.

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

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

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

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

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

[0324] In some embodiments, the filter for a smoking article 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 filter for a smoking article manufactured from tow, thereby preventing problems such as filter jamming during the filter manufacturing process or cigarette manufacturing process. The types, components, and contents of usable binders are the same as described above.

[0325] In some embodiments, 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 or non-porous paper that wraps the lyocell tow described above and can maintain the filter shape (e.g., a cylinder or a cylindrical shape).

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

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

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

[0329] In 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.

[0330] In some embodiments, the filter for the smoking article may include lyocell tow and filter paper. Descriptions of the lyocell tow and filter paper are the same as those described above, and are therefore omitted.

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

[0332] In some embodiments, when a porous paper is used, the paper may have a porosity of 10 to 50,000 Coresta Units (CU). A Coresta Unit is defined as a porosity of 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.

[0333] In some embodiments, the weight of the paper is from 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:

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

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

[0336]

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

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

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

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

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

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

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

[0344]

[0345] 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, the lyocell material according to some embodiments satisfies a predetermined whiteness, a predetermined brightness, and / or a predetermined hydrogen peroxide content. As a result, a filter for a smoking article comprising the lyocell material can provide a user with limited off-flavors, enhanced sensory properties, and an improved user experience.

[0346]

[0347] 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.

[0348]

[0349] 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.

[0350]

[0351] [Manufacturing example]

[0352] Cellulose pulp having an alpha-cellulose content of 93.9% and a degree of polymerization (DPw) of 820 was mixed with an NMMO / H2O solvent having a propyl gallate content of 0.01 wt% to prepare a spinning dope for producing tow having a concentration of 11 wt%. Then, the spinning dope was spun while maintaining the spinning temperature at 110°C in the spinning nozzle and appropriately adjusting the discharge amount and spinning speed.

[0353] The filament-phase spinning dope discharged from the spinning nozzle 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 15°C) in the coagulating tank through the air gap section. At this time, the cooling air in the air gap section primarily coagulates the spinning dope at a temperature of 8°C and an airflow rate of 120 N㎥ / h. In addition, the concentration of the coagulating liquid was continuously monitored using a sensor and a refractometer.

[0354] Then, the coagulated lyocell filament was washed. In particular, 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 treatment bath containing a bleaching solution and an emulsion. An upper roller was placed at the top of the treatment bath, and a lower roller was placed so as to be immersed in the bleaching solution. The washed filament was transported by the upper roller and the lower roller.

[0355] The filament was processed at a pressure of 29.42 N / cm2 (3 kgf / cm2) by a nip roll installed in the bath discharge section and fed into a crimp machine for crimping. In particular, the pressure of the press roller was set to 24.52 N / cm2 (2.5 kgf / cm2), and the pressure of the doctor blade was set to 4.90 N / cm2 (0.5 kgf / cm2) to manufacture the tow.

[0356] 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.

[0357]

[0358] The manufactured tow has a single fiber count of 2.78 to 4.44 dtex (2.5 to 4.0 denier), a total fiber count of 3,333 to 5,000 tex (30,000 to 45,000 denier), and a crimp count of 5.91 to 15.75 ea / cm (15 to 40 ea / inch).

[0359]

[0360] [Example]

[0361] Examples 1 to 7

[0362] Lyocell materials were manufactured according to the manufacturing examples, and the conditions of the bleaching treatment step were as shown in Table 1 below. It was confirmed that the lyocell materials of Examples 1 to 7 each had a width of 30 mm to 34 mm. In addition, it was confirmed that the crimp was applied uniformly, and no edge bursting was observed during the crimping step.

[0363]

[0364] Comparative Example 1

[0365] Lyocell material was manufactured according to the manufacturing example, except that the bleaching step was omitted. The width of the Lyocell material of Comparative Example 1 was 24 mm, but it was found that the formation of a uniform crimp was limited during the crimping step.

[0366]

[0367] Comparative Examples 2 to 4

[0368] Lyocell materials were manufactured according to the manufacturing examples, and the conditions of the bleaching treatment step were as shown in Table 1 below. The widths of the Lyocell materials of Comparative Examples 2 to 4 were each approximately 30 mm, and crimping was performed relatively uniformly.

[0369]

[0370] Conditions of the bleaching treatment step Depth of the lower roller (mm) Impregnation time per lower roller (s) Number of lower rollers Total impregnation time (s) Temperature of the bleaching solution (℃) Example 1 1500.1420.2860 23000.2720.5460 31500.1440.5460 43000.2741.0860 51500.1440.54 1006 1500.1440.5440 71500.1481.0860 Comparative example 100.0000.00-2 1500.1410.1460 31500.1440.54 20 41500.1440.54 120

[0371]

[0372] [Evaluation example]

[0373] Experiment 1: Characteristic Evaluation of Lyocell Materials

[0374] Filters for smoking articles each including the lyocell materials manufactured in Examples 1 to 7, Comparative Example 1, and Comparative Examples 3 to 5, and the lyocell material of Comparative Example 2 were prepared.

[0375] To evaluate the whiteness and brightness of the lyocell material, each filter for smoking articles was cut and the lyocell material was broken. The cross-section of the broken part was measured using a CCM device (X-Rite ColorEye 7000A Spectrophotometer). The brightness was measured for a light source with a wavelength of 460 nm, and the whiteness was measured according to CIE D65-10. Each measurement was repeated three times. The average values ​​of the whiteness and brightness measured for each lyocell material are shown in Table 2 below.

[0376] In addition, to evaluate the residual amount of hydrogen peroxide contained in the lyocell material, each filter for smoking articles was left under constant temperature and humidity conditions for 24 hours. Thereafter, the lyocell material was immersed in ultrapure water at a concentration of 10 wt% based on the weight of the lyocell material in the filter, and the lyocell material was sonicated for 30 minutes. Thereafter, 10 ml of distilled water and 2 ml of 6N H2SO4 were added to the lyocell material instead of 10 ml of ultrapure water, thereby preparing a sample for titration.

[0377] The residual hydrogen peroxide in the sample was titrated using 0.1 N KMnO4 and a titrator (Metrohm 665 Dosimat). The residual hydrogen peroxide was measured according to Equation 1 below. The measured results are shown in Table 2 below.

[0378] [Formula 1]

[0379] Concentration of hydrogen peroxide (%) = 0.0017·V·F·D / S·100

[0380] In Equation 1, V is the titration amount (ml) of 0.1N potassium permanganate solution, F is the titration coefficient of 0.1N potassium permanganate solution, D is the dilution ratio of the hydrogen peroxide-containing solution extracted from the sample, which is 1, and S is the weight (g) of the sample.

[0381]

[0382] Characteristics of Lyocell material Brightness (@460nm) Whiteness Residual amount of H2O2 (ppm) Example 1 79.25 9.38 128 3.77 2.5 298 38 3.97 3.43 15 48 4.27 4.24 9 5 5 8 6.18 0.55 45 68 0.26 7.5 18 47 8 6.68 2.16 7 8 Comparative example 171.44 9.80 272.25 1.24 5 372.75 2.74 24 8 9.29 0.31 5 8 9

[0383]

[0384] Referring to Table 2, the lyocell materials of Comparative Examples 1 to 3 were found to be insufficient in both brightness and whiteness, and the lyocell material of Comparative Example 4 was found to have an excessive amount of residual H2O2.

[0385]

[0386] Experiment 2: Sensory Evaluation of Filters for Smoking Products

[0387] Smoking articles were manufactured using the smoking article filters each containing the lyocell material manufactured in Examples 1 to 7 and Comparative Examples 1 to 4. Consumer evaluations were conducted on each smoking article. Sensory evaluations were conducted using the Home Usage Test method on 100 randomly selected consumers.

[0388] Sensory evaluations were conducted on a 7-point scale for taste and satisfaction. Guidelines were provided for assessing overall satisfaction in the satisfaction category. A smoking article (commercially available) containing cellulose acetate tow was prepared as a control, and the relative values ​​(average, %) of each example and comparative example relative to the control were calculated. The evaluation results are shown in Table 3 below.

[0389]

[0390] Sensory evaluation of filters for smoking articles (%) Taste satisfaction Example 199.491.2297.196.3399.496.7499.196.3599.296.1699.392.1799.492.9 Comparative example 1101.251.2298.677.3399.468.7465.762.0

[0391]

[0392] Referring to Table 3, Examples 1 to 7 were all reported to provide improved aftertaste compared to the control group, while Comparative Example 1 was reported to provide worse aftertaste compared to the control group. In addition, Examples 1 to 7 were all reported to provide a level of satisfaction comparable to the control group, while Comparative Example 1 and Comparative Examples 2 to 4 were all reported to provide a level of satisfaction significantly lower than the control group.

Claims

1. Contains crimped lyocell multifilament, Lyocell material with a whiteness of 55 to 85.

2. In paragraph 1, The above whiteness is a value measured from the fractured part of the lyocell material.

3. In paragraph 1, Lyocell material having a brightness of 75 or greater when measured at a wavelength of 460 nm.

4. In paragraph 3, The above brightness is a value measured from the fractured part of the lyocell material.

5. In paragraph 1, Lyocell material containing more hydrogen peroxide, with a concentration of hydrogen peroxide of 1000 ppm or less.

6. In paragraph 5, Lyocell material having a concentration of hydrogen peroxide of 250 ppm to 700 ppm.

7. In paragraph 1, Contains more hydrogen peroxide, Lyocell material having a brightness of 75 or more when measured at a wavelength of 460 nm and a hydrogen peroxide concentration of 1000 ppm or less.

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

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

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

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

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

13. A filter for a smoking article comprising a lyocell material having a whiteness of 55 to 85.

14. In paragraph 13, The above lyocell material is a filter for smoking articles, having a brightness of 75 or more measured at a wavelength of 460 nm.

15. In paragraph 13, A filter for smoking articles, wherein the above lyocell material further contains hydrogen peroxide, and the concentration of hydrogen peroxide is 1000 ppm or less.

16. In paragraph 13, A filter for smoking articles, wherein the concentration of the hydrogen peroxide is 250 ppm to 700 ppm.

17. A smoking article comprising a filter for a smoking article according to any one of claims 13 to 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; a bleaching treatment step; and a crimping step; A method for manufacturing a lyocell material, wherein in the above bleaching treatment step, transportation of the lyocell multifilaments is performed by one or more upper rollers and one or more lower rollers.

19. In Article 18, A method for manufacturing a lyocell material, wherein in the above bleaching treatment step, the lyocell multifilament is impregnated in a bleaching solution at least twice.

20. In paragraph 18, A method for manufacturing a lyocell material having an impregnation time of less than 0.54 seconds per lower roller.