Lyocell material, filter for smoking articles, smoking articles, and method for manufacturing the same.

Abstract

The present invention relates to a lyocell material, a filter for smoking articles containing the lyocell material, and a method for manufacturing the same. The lyocell material and the filter for smoking articles containing the same manufactured by the present invention replace conventional cellulose acetate materials and filters, and not only have excellent electrostatic properties, but also provide excellent filter manufacturing processability and excellent tobacco properties (e.g., uniform filtering performance).

Description

[Technical Field]

[0001] The present invention relates to a lyocell material, a filter containing the same, a smoking article, and a method for manufacturing the same. [Background technology]

[0002] Traditionally, cellulose acetate fibers have been the primary material used for cigarette filters. While cellulose acetate is known to be biodegradable, cigarette filters made from it retain their original form for one to two years after being buried in the soil, and it takes a considerable amount of time for them to completely biodegrade. Considering the amount and toxicity of cigarette products that are not only collected and buried as waste after smoking, but also discarded and left in the living environment, it is necessary to further improve the biodegradability of cigarette filters. For this reason, lyocell, which is more environmentally friendly than cellulose acetate, has recently been chosen as an alternative material.

[0003] There is a need to develop a filter material that can replace conventional cellulose acetate materials while offering superior hardness and quality, providing user satisfaction, and improving productivity.

[0004] On the other hand, the use of lyocell material has been proposed as an alternative to cellulose acetate material. However, it is known that lyocell material differs from cellulose acetate material in terms of spreadability. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] One objective of the present invention is to provide a lyocell material that can replace cellulose acetate, which is commercially available as a filter for smoking articles.

[0006] Another object of the present invention is to provide a lyocell material for smoking article filters that is environmentally friendly in its manufacturing process and has excellent biodegradability when discarded.

[0007] Another object of the present invention is to provide a lyocell material for smoking article filters with regulated electrostatic properties.

[0008] Another object of the present invention is to provide a lyocell filter for smoking articles.

[0009] Another object of the present invention is to provide a smoking article (e.g., a cigarette) containing a lyocell filter.

[0010] Another object of the present invention is to improve the processability related to the manufacture of the lyocell material, filters, and smoking articles.

[0011] The aforementioned and other objectives of the present invention can all be resolved by the present invention, which is described in detail below. [Means for solving the problem]

[0012] According to specific examples of the present invention, a lyocell material, a filter containing the same, and smoking articles may be provided.

[0013] The inventors of this invention discovered that the spreading properties and processability of lyocell material can be adjusted by adjusting the electrostatic properties of the lyocell material. Furthermore, the invention was completed by noting that by adjusting the spreading properties, the process equipment and process conditions used in the filter manufacturing process from cellulose acetate material can be substantially the same in the filter manufacturing process from lyocell material.

[0014] In this invention, the term "spreading properties" refers to the properties by which the lyocell material is unfolded. The unfolding (spreading) of the lyocell material is carried out in one or more steps.

[0015] Specifically, the lyocell material is unfolded in the longitudinal direction of the lyocell material (i.e., the direction parallel to the stretching direction of the lyocell multifilament), the width direction of the lyocell material (i.e., the direction in which the lyocell material is thicker, excluding the longitudinal direction), and / or the thickness direction of the lyocell material (i.e., the direction perpendicular to both the longitudinal and width directions).

[0016] The development of lyocell material is achieved by applying external forces to the lyocell material. These external forces are applied in the longitudinal, widthwise, and / or thicknesswise directions of the lyocell material and are applied by mechanical devices.

[0017] For example, lyocell material can be spread in the width direction through one or more air spreaders, or lyocell material can be spread in the longitudinal direction through one or more air spreaders.

[0018] Alternatively, the lyocell material may be sequentially unfolded in the width direction and the longitudinal direction through two or more air spreaders. Alternatively, the lyocell material may be sequentially unfolded in the longitudinal direction and the width direction through two or more air spreaders. Alternatively, the lyocell material may be simultaneously unfolded in the width direction and the longitudinal direction through a single air spreader.

[0019] Through unfolding, the lyocell material is spread uniformly, and sufficient expansion can occur from the uniformly spread lyocell material, which can increase entanglement between monofilaments and / or lyocell multifilaments. The sufficiently unfolded lyocell material can be included in a smoking article filter and function as a filter.

[0020] For example, lyocell material can be collected through one or more Tow Transfer Jets (TTJs) so that the lyocell material, which is spread in the longitudinal and widthwise directions, is filled into the filter wrapping paper. Specifically, the TTJs draw in the lyocell material so that the spread lyocell material is brought together, and the lyocell material can be spread inside the filter wrapping paper through one or more TTJs.

[0021] On the other hand, if the lyocell material is unfolded unevenly, its spreading properties may be considered insufficient. Specifically, if the lyocell material is unfolded unevenly in the width direction, unevenly in the thickness direction, or unevenly in both the width and thickness directions, its spreading properties may be considered insufficient.

[0022] For example, if the lyocell material is not spread properly and the aggregation of the emulsion contained in the lyocell material is visible to the naked eye, or if the lyocell material is not spread properly and the aggregation of the multifilaments contained in the lyocell material is visible to the naked eye, the spreading properties of the lyocell material may be considered insufficient.

[0023] More specifically, if the width of the lyocell material changes by more than three times during the air spreader deployment process, and the width change of the lyocell material remains constant during subsequent processes, the spreading characteristics of the lyocell material can be evaluated as good.

[0024] Conversely, if the widthwise change of the lyocell material is less than three times during the air spreader deployment process, or if the widthwise length at which gaps are observed between the lyocell materials is 20% or more compared to the widthwise length of the lyocell material, or if the widthwise change of the lyocell material is 50% or more during subsequent processes, the spreading characteristics of the lyocell material may be evaluated as poor.

[0025] For example, visual observation of the lyocell material for evaluating its spreading properties is performed during the spreading step and / or transfer step.

[0026] For example, if, despite an external force being applied, the lyocell material does not bulge in the area where the force is applied, the lyocell material may be considered to have insufficient spreading properties.

[0027] Furthermore, if rupture of the lyocell material and / or rupture of the lyocell multifilament occurs during the unfolding process, the spreading characteristics may be evaluated as poor. Rupture of the lyocell multifilament may cause plies to form on the surface of the lyocell material. Rupture of the lyocell material and / or rupture of the lyocell multifilament may be visible to the naked eye.

[0028] During the process of further processing lyocell material for use in smoking article filters, lyocell material lacking sufficient spreading properties may experience fracture and / or plying. For example, in order to give lyocell material a bulge, external forces are applied to the lyocell material in the longitudinal, widthwise, and thicknesswise directions by a spreading device, and these external forces may cause fracture and / or plying in the lyocell material.

[0029] More specifically, as the lyocell material is transported longitudinally, external forces are applied in the width and thickness directions. During the process in which some of the lyocell multifilaments contained in the lyocell material are unfolded by these external forces, rupture of the lyocell multifilaments occurs, and furthermore, the rupture of the lyocell multifilaments leads to rupture of the lyocell material. As a result, the transport of the lyocell material may be interrupted, the production of filters for smoking articles may be limited, or the performance of filters for smoking articles may deteriorate.

[0030] Specifically, according to one example of the present invention, a lyocell material can be provided comprising crimped lyocell multifilaments and an emulsion coated on the lyocell multifilaments, wherein the emulsion comprises (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.

[0031] A further specific example relating to the present invention provides a filter for a smoking article comprising a lyocell material, wherein the lyocell material comprises crimped lyocell multifilaments and an emulsion coated on the lyocell multifilaments, the emulsion comprising (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.

[0032] According to yet another specific example relating to the present invention, a smoking article comprising the lyocell material or filter may be provided.

[0033] Further specific examples relating to the present invention may provide the lyocell material, a filter containing the same, and a method for manufacturing a smoking article.

[0034] In this specification, "smoking articles" means items that generate aerosols, such as tobacco (cigarettes) and cigars. In connection with this, smoking articles may contain aerosol-generating substances or aerosol-forming substrates. Furthermore, smoking articles may contain solid substances based on tobacco raw materials, such as flat tobacco leaves, shredded tobacco, and reconstituted tobacco. In addition, smoking substances may contain volatile compounds.

[0035] In this specification, unless otherwise defined, if the properties of lyocell material, smoking article filters, and related components and compositions are affected by temperature, the temperature at which such properties are observed or measured may be room temperature. In this case, room temperature is the temperature without any special reduction or heating, and may be, for example, 10 to 35°C, specifically 15 to 35°C, 20 to 30°C, or about 25°C.

[0036] The present invention will be described in more detail below.

[0037] As an example relating to the present invention, the present invention relates to a lyocell material. The lyocell material may be used in filters for smoking articles, although this is not particularly limited.

[0038] In one exemplary example, a lyocell material for a smoking article filter comprises crimped lyocell multifilaments and an emulsion coated on at least a portion of the lyocell multifilaments, and the electrostatic value measured from the lyocell material may be approximately 0.01 kV to approximately 1.4 kV.

[0039] In an example of a lyocell material for a smoking article filter, the electrostatic value may be approximately 0.05 kV to approximately 1.2 kV.

[0040] In an example of a lyocell material for a smoking article filter, the electrostatic value may be approximately 0.05 kV to approximately 1.0 kV.

[0041] In an example of a lyocell material for a smoking article filter, the electrostatic value may be approximately 0.08 kV to approximately 1.05 kV.

[0042] In an example of a lyocell material for a smoking article filter, the electrostatic value may be approximately 0.10 kV to approximately 1.05 kV.

[0043] In an example of a lyocell material for a smoking article filter, the electrostatic value can be measured by the friction method.

[0044] In an example of a lyocell material for a smoking article filter, the friction method may be a method for measuring the static electricity generated from the lyocell material by friction.

[0045] In an example of a lyocell material for a smoking article filter, the friction method may be a method for measuring static electricity generated from a dry lyocell material.

[0046] In an example of a lyocell material for a smoking article filter, the friction method may be a method for measuring static electricity generated at room temperature.

[0047] Furthermore, room temperature can be approximately 20°C to 25°C. For example, the friction method can be a method for measuring static electricity generated at a temperature of approximately 21°C.

[0048] In an example of a lyocell material for a smoking article filter, the friction method may be a method for measuring static electricity generated under humidity conditions of approximately 35% RH.

[0049] In an exemplary lyocell material for a smoking article filter, friction may occur under conditions where at least a portion of the lyocell material is pressurized.

[0050] In an exemplary lyocell material for a smoking article filter, pressurization may be performed by the load of an abrasion wheel.

[0051] In an exemplary lyocell material for a smoking article filter, the load applied by the abrasion wheel is approximately 200g to 300g. The load may also be approximately 250g.

[0052] In an exemplary lyocell material for a smoking article filter, friction between the lyocell material and the wear wheel may occur due to the rotation of the lyocell material.

[0053] In an exemplary lyocell material for a smoking article filter, friction between the lyocell material and the wear wheel may occur due to the rotation of the wear wheel.

[0054] In an exemplary lyocell material for a smoking article filter, the lyocell material or the wear wheel may be rotated at approximately 40 cycles / min to approximately 80 cycles / min. Alternatively, the lyocell material or the wear wheel may be rotated at approximately 60 cycles / min. The rotation of the lyocell material and / or the wear wheel may generate friction between the lyocell material and the wear wheel. Furthermore, static electricity may be induced and measured on the surface of the lyocell material due to friction.

[0055] In an exemplary lyocell material for a smoking article filter, the number of rotations of the lyocell material or the wear wheel may be approximately 5 to approximately 50 times. The number of rotations of the lyocell material or the wear wheel may be approximately 10 to approximately 30 times.

[0056] In an exemplary lyocell material for a smoking article filter, static electricity is measured by an electrostatic meter, which may be located away from the lyocell material.

[0057] In an exemplary lyocell material for a smoking article filter, an electrostatic measuring device may be placed on one surface of the lyocell material.

[0058] In an exemplary lyocell material for a smoking article filter, the electrostatic measuring device may be located approximately 0.1 cm to 10 cm away from the lyocell material. Alternatively, the electrostatic measuring device may be located approximately 5 cm away from the lyocell material. Furthermore, the long axis of the electrostatic measuring device and a hypothetical plane parallel to the rotational direction of the lyocell material may intersect or be perpendicular to each other.

[0059] In an exemplary lyocell material for a smoking article filter, the emulsion may include (a) an ester of an aliphatic having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) an ester of sorbitan and an aliphatic having 16 or more carbon atoms.

[0060] In an exemplary lyocell material for a smoking article filter, the emulsion may contain 20 to 60 parts by weight of (b) an ester of sorbitan and a fatty acid having 16 or more carbon atoms, with respect to 100 parts by weight of (a) an ester of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol.

[0061] In an exemplary lyocell material for a smoking article filter, the emulsion may further comprise an alkylene oxide adduct (c) to the esterified product (b).

[0062] In an exemplary lyocell material for a smoking article filter, the emulsion may contain 10 to 50 parts by weight of (c) an adduct of an alkylene oxide to the esterified product (b) with respect to 100 parts by weight of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol.

[0063] In an exemplary lyocell material for a smoking article filter, the crimped lyocell multifilament may have a total fineness of 15,000 to 45,000 denier and 20 to 50 crimps per inch.

[0064] In an exemplary lyocell material for a smoking article filter, the emulsion may be present in an amount of about 0.1% by weight or more relative to 100% by weight of the total lyocell material for the smoking article filter. Furthermore, the emulsion may be present in an amount of about 0.5% by weight or more.

[0065] In an exemplary lyocell material for a smoking article filter, the emulsion may be included in an amount of about 20% by weight or less relative to 100% by weight of the total lyocell material for the smoking article filter.

[0066] In an exemplary lyocell material for a smoking article filter, the emulsion may be included in an amount of about 9% by weight or less relative to 100% by weight of the total lyocell material for the smoking article filter.

[0067] In an exemplary lyocell material for a smoking article filter, the emulsion may be included in an amount of about 0.5% to 9% by weight or less relative to 100% by weight of the total lyocell material for the smoking article filter.

[0068] Furthermore, a smoking article is provided that includes one of the exemplary lyocell filters for smoking articles.

[0069] Furthermore, an exemplary method for manufacturing a lyocell material for smoking article filters includes the steps of emulsion treatment of lyocell multifilaments and crimping of lyocell multifilaments, wherein the emulsion treatment is performed such that the electrostatic value measured from the lyocell material for smoking article filters is approximately 0.01kV to 1.4kV.

[0070] Method for manufacturing lyocell material for smoking article filters In an exemplary method for producing lyocell material for smoking article filters, 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.

[0071] In an exemplary method for producing a lyocell material for a smoking article filter, the emulsion may be included in an amount of about 0.1% by weight or more relative to 100% by weight of the total lyocell material for the smoking article filter.

[0072] In an exemplary method for producing a lyocell material for a smoking article filter, the emulsion may be included in an amount of about 20% by weight or less relative to 100% by weight of the total lyocell material for the smoking article filter.

[0073] In an exemplary method for manufacturing lyocell material for smoking article filters, a lyocell multifilament may be provided having a total fineness of 15,000 to 45,000 denier and 20 to 50 crimps per inch.

[0074] Furthermore, a filter for a smoking article according to an exemplary embodiment includes a lyocell material, the lyocell material includes crimped lyocell multifilaments and an emulsion coated on the lyocell multifilaments, and the electrostatic value measured from the lyocell material is approximately 0.01kV to approximately 1.4kV.

[0075] Furthermore, the exemplary smoking article includes a filter for a smoking article according to any one of the exemplary embodiments.

[0076] Furthermore, an exemplary method for manufacturing a smoking article filter includes the steps of emulsion treatment of lyocell multifilaments, crimping of lyocell multifilaments, and manufacturing a filter using the crimped lyocell multifilaments, wherein the emulsion treatment step is performed such that the electrostatic value measured from the lyocell material for the smoking article filter is approximately 0.01kV to 1.4kV.

[0077] The electrostatic values ​​measured from lyocell material in exemplary embodiments were approximately 0.01kV to approximately 1.4kV, and 0.05kV to 1.2kV. Specifically, the electrostatic values ​​measured from lyocell material were 0.08kV to 1.05kV, 0.10kV to 1.05kV, 0.12kV to 1.05kV, 0.13kV to 1.05kV, 0.14kV to 1.05kV, 0.15kV to 1.05kV, 0.16kV to 1.05kV, 0.17kV to 1.05kV, 0.18kV to 1.05kV, 0.19kV to 1.05kV, 0.20kV to 1.05kV, and 0.21kV to 1.0 5kV, 0.22kV to 1.05kV, 0.23kV to 1.05kV, 0.24kV to 1.05kV, 0.25kV to 1.05kV, 0.26kV to 1.05kV, 0.27kV to 1.05kV, 0.28kV to 1.05kV, 0.29kV to 1.05kV, 0.30kV to 1.05kV, 0.31kV to 1.05kV, 0.32kV to 1.05kV, 0.33kV to 1.05kV, 0.34kV to 1.05kV, 0.35kV to 1.05kV, 0.36kV to 1.05kV, 0.37kV to 1.05kV, 0.38kV to 1.05kV, 0.39kV to 1.05kV, 0.40kV to 1.05kV, 0.41kV to 1.05kV, 0.42kV to 1.05kV, 0.43kV to 1.05kV, 0.44kV to 1.05kV, 0.45kV to 1.05kV, 0.46kV to 1.05kV, 0.47kV to 1.05kV, 0.48 It can be kV or 1.05kV, 0.49kV or 1.05kV, 0.50kV or 1.05kV, 0.61kV or 1.05kV, 0.62kV or 1.05kV, 0.63kV or 1.05kV, 0.64kV or 1.05kV, 0.65kV or 1.05kV, 0.66kV or 1.05kV, 0.67kV or 1.05kV, 0.68kV or 1.05kV, 0.69kV or 1.05kV, or 0.70kV or 1.05kV.

[0078] For example, the lower limit of the electrostatic value is 0.05kV or higher, 0.06kV or higher, 0.07kV or higher, 0.08kV or higher, 0.09kV or higher, 0.10kV or higher, 0.11kV or higher, 0.12kV or higher, 0.13kV or higher, 0.14kV or higher, 0.15kV or higher, 0.16kV or higher, 0.17kV or higher, 0.18kV or higher, 0.19kV or higher, 0.20kV or higher, 0.21kV or higher, 0.22kV or higher, 0.23kV or higher, 0.24kV or higher, 0.25kV or higher, 0.26kV or higher, 0.27kV or higher, 0.28kV or higher, 0.29kV or higher, 0.30kV or higher, 0.3 1kV or higher, 0.32kV or higher, 0.33kV or higher, 0.34kV or higher, 0.35kV or higher, 0.36kV or higher, 0.37kV or higher, 0.38kV or higher, 0.39kV or higher, 0.40kV or higher, 0.41kV or higher, 0.42kV or higher, 0.43kV or higher, 0.44kV or higher, 0.45kV or higher, 0.46kV or higher, 0.47kV or higher, 0.48kV or higher, 0.49kV or higher, 0.50kV or higher, 0.51kV or higher, 0.52kV or higher, 0.53kV or higher, 0.54kV or higher, 0.55kV or higher, 0.56kV or higher, 0.57kV or higher, 0.58kV or higher, 0 0.59kV and above, 0.60kV and above, 0.61kV and above, 0.62kV and above, 0.63kV and above, 0.64kV and above, 0.65kV and above, 0.66kV and above, 0.67kV and above, 0.68kV and above, 0.69kV and above, 0.70kV and above, 0.71kV and above, 0.72kV and above, 0.73kV and above, 0.74kV and above, 0.75kV and above, 0.76kV and above, 0.77kV and above, 0.78kV and above, 0.79kV and above, 0.80kV and above, 0.81kV and above, 0.82kV and above, 0.83kV and above, 0.84kV and above, 0.85kV and above, 0.86kV and above The upper limits for static electricity values ​​are 0.87kV or higher, 0.88kV or higher, 0.89kV or higher, 0.90kV or higher, 0.91kV or higher, 0.92kV or higher, 0.93kV or higher, 0.94kV or higher, 0.95kV or higher, 0.96kV or higher, 0.97kV or higher, 0.98kV or higher, or 0.99kV or higher, and the upper limits for static electricity values ​​are 1.35kV or lower, 1.30kV or lower, 1.25kV or lower, 1.20kV or lower, 1.15kV or lower, 1.14kV or lower, 1.13kV or lower, 1.12kV or lower, 1.11kV or lower, 1.10kV or lower, 1.09kV or lower, 1.08kV or lower, 1.07kV or lower, 1.It may be 0.6kV or less, 1.05kV or less, 1.04kV or less, 1.03kV or less, 1.02kV or less, 1.01kV or less, 1.00kV or less, 0.95kV or less, 0.90kV or less, 0.85kV or less, 0.80kV or less, 0.75kV or less, 0.70kV or less, 0.65kV or less, 0.60kV or less, 0.55kV or less, or 0.50kV or less.

[0079] If the electrostatic value does not meet the aforementioned numerical range, the spreading characteristics of the lyocell material deteriorate. Specifically, when an external force (e.g., tensile force) is applied to the lyocell material for unfolding, the lyocell material may not unfold to have a uniform thickness and / or uniform width. As a result, the lyocell material may be scattered during the manufacturing process of a filter containing the lyocell material, and plies may be formed.

[0080] Furthermore, if the electrostatic value does not meet the aforementioned numerical range, a stronger external force is required for uniform deployment of the lyocell material, which may cause the lyocell material to break during the deployment process. As a result, the manufacturing process of filters containing lyocell material may be interrupted, leading to increased process costs.

[0081] On the other hand, if the static electricity value does not satisfy the aforementioned numerical range, the lyocell material may not be uniformly spread in the width direction. In this case, the uniformity of the filter containing the lyocell material decreases, and the filtering performance of the filter may decrease due to the uneven arrangement of the lyocell material. On the other hand, the lyocell material according to the exemplary embodiment includes an emulsion, and the emulsion may be hydrophobic. Further details regarding the emulsion are as described herein. Typically, unlike when a hydrophilic emulsion is used, when a hydrophobic emulsion is used, the generation of static electricity in the lyocell material increases.

[0082] On the other hand, if the electrostatic value is below the lower limit, more preferably below 0.08 kV, the frictional properties of the lyocell multifilament may be insufficient. As a result, the emulsion may not be sufficiently dispersed in the lyocell multifilament, and aggregation between the emulsion particles may be observed. Furthermore, insufficient friction may not be generated between the crimping device and the lyocell multifilament during the crimping process. In addition, a sufficient number of crimps may not be applied to the lyocell multifilament, and the uniformity of the applied crimps may be significantly lacking.

[0083] However, as demonstrated by exemplary embodiments, the inclusion of an emulsion in the lyocell material to satisfy certain conditions can actually suppress the generation of static electricity due to the external environment or external forces. For example, by including an emulsion such that the total amount of emulsion (OPU) satisfies a certain range, the generation of static electricity from the lyocell material can be suppressed even under high-temperature conditions.

[0084] As a result, the manufacturing process of filters using lyocell material according to the exemplary embodiment may be less affected by environmental constraints related to static electricity generation, and the reproducibility of the filter manufacturing process may be improved.

[0085] More specifically, the lyocell material comprises crimped lyocell multifilaments and an emulsion coated on the lyocell multifilaments. The emulsion comprises (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. Such an emulsion can be applied to some or all of the monofilaments or multifilaments constituting the lyocell material. Furthermore, the emulsion can penetrate between the filaments.

[0086] An emulsion containing at least components (a) and (b) may be hydrophobic. As a result, the electrostatic properties of the lyocell surface can be adjusted by using the emulsion. Consequently, a lyocell material treated with the emulsion has excellent spreading properties.

[0087] In the specific example of this application, the lyocell material may contain the emulsion in a predetermined amount. In this case, the emulsion content may mean OPU (wt%) as described later. For example, the lyocell material may contain the emulsion in an amount of 0.1% by weight or more, based on 100% by weight of the total lyocell material. Specifically, the lower limit of the emulsion content is 0.5% by weight or more, 0.6% by weight or more, 0.7% by weight or more, 0.8% by weight or more, 0.9% by weight or more, 1.0% by weight or more, 1.1% by weight or more, 1.2% by weight or more, 1.3% by weight or more, 1.4% by weight or more, 1.5% by weight or more, 1.6% by weight or more, 1.7% by weight or more, 1.8% by weight or more, 1.9% by weight or more, 2.0% by weight or more, 2.1% by weight or more. Amount% or more, 2.2 weight% or more, 2.3 weight% or more, 2.4 weight% or more, 2.5 weight% or more, 2.6 weight% or more, 2.7 weight% or more, 2.8 weight% or more, 2.9 weight% or more, 3.0 weight% % or more, 3.1wt% or more, 3.2wt% or more, 3.3wt% or more, 3.4wt% or more, 3.5wt% or more, 3.6wt% or more, 3.7wt% or more, 3.8wt% or more, 3.9wt% or more Above, 4.0% by weight or more, 4.1% by weight or more, 4.2% by weight or more, 4.3% by weight or more, 4.4% by weight or more, 4.5% by weight or more, 4.6% by weight or more, 4.7% by weight or more, 4.8% by weight or more , 4.9% by weight or more, 5.0% by weight or more, 5.1% by weight or more, 5.2% by weight or more, 5.3% by weight or more, 5.4% by weight or more, 5.5% by weight or more, 5.6% by weight or more, 5.7% by weight or more, 5 It is 0.8% by weight or more, 5.9% by weight or more, 6.0% by weight or more, 6.1% by weight or more, 6.2% by weight or more, 6.3% by weight or more, 6.4% by weight or more, 6.5% by weight or more, 6.6% by weight or more, 6.7% by weight or more, 6.8% by weight or more, 6.9% by weight or more, 7.0% by weight or more, 7.1% by weight or more, 7.2% by weight or more, 7.3% by weight or more, 7.4% by weight or more, or 7.5% by weight or more.And the upper limits are, for example, 20.0% by weight or less, 18.0% by weight or less, 17.0% by weight or less, 16.0% by weight or less, 15.0% by weight or less, 14.5% by weight or less, 14.0% by weight or less, 13.5% by weight or less, 13.0% by weight or less, 12.5% ​​by weight or less, 12.0% by weight or less, 11.5% by weight or less, 11.0% by weight or less, 10.5% by weight or less, 10% by weight or less, 9.5% by weight or less, 9.0% by weight or less, 8.5% by weight or less, 8.0% by weight or less, 7.8% by weight or less, 7.6% by weight or less. Weight%, 7.5% by weight or less, 7.4% by weight or less, 7.3% by weight or less, 7.2% by weight or less, 7.1% by weight or less, 7.0% by weight or less, 6.9% by weight or less, 6.8% by weight or less, 6.7% by weight or less, 6.6% by weight or less, 6.5% by weight or less, 6. 4% by weight or less, 6.3% by weight or less, 6.2% by weight or less, 6.1% by weight or less, 6.0% by weight or less, 5.9% by weight or less, 5.8% by weight or less, 5.7% by weight or less, 5.6% by weight or less, 5.5% by weight or less, 5.4% by weight or less, 5.3% by weight or less, 5.2% by weight or less, 5.1% by weight or less, 5.0% by weight or less, 4.9% by weight or less, 4.8% by weight or less, 4.7% by weight or less, 4.6% by weight or less, 4.5% by weight or less, 4.4% by weight or less, 4.3% by weight or less, 4.2% by weight or less, 4.1% by weight 4.0% by weight or less, 3.9% by weight or less, 3.8% by weight or less, 3.7% by weight or less, 3.6% by weight or less, 3.5% by weight or less, 3.4% by weight or less, 3.3% by weight or less, 3.2% by weight or less, 3.1% by weight or less, 3.0% by weight or less, 2.9 It may be less than or equal to 0.9% by weight, less than or equal to 2.8% by weight, less than or equal to 2.7% by weight, less than or equal to 2.6% by weight, less than or equal to 2.5% by weight, less than or equal to 2.4% by weight, less than or equal to 2.3% by weight, less than or equal to 2.2% by weight, less than or equal to 2.1% by weight, less than or equal to 2.0% by weight, less than or equal to 1.9% by weight, less than or equal to 1.8% by weight, less than or equal to 1.7% by weight, less than or equal to 1.6% by weight, less than or equal to 1.5% by weight, less than or equal to 1.4% by weight, less than or equal to 1.3% by weight, less than or equal to 1.2% by weight, less than or equal to 1.1% by weight, less than or equal to 1.0% by weight, less than or equal to 0.9% by weight, less than or equal to 0.8% by weight, or less than or equal to 0.7% by weight.

[0088] As a method for measuring the OPU content of the emulsion, for example, an extrusion method may be used. For example, a sample (for example, 2 to 5 g, specifically about 2.5 g) is taken (the weight of the taken sample is called the sample weight), and the sample is put into a syringe-like container. The material of the container is not particularly limited, but it may be made of SUS (stainless steel). Next, a solvent (for example, methanol) is put into the container containing the sample (the amount of solvent put in may be 10 ml or less (for example, about 8 ml)). When putting the solvent into the sample, a drop method is used, and the drop speed is adjusted to be uniform. Then, the solvent put into the container as described above is dropped from one end of the syringe-like container onto a plate. At this time, the plate is weighed in advance (the weighed weight is called the plate weight A), and the plate is set up so that the solvent that falls onto the plate scatters (i.e., evaporates) at a temperature of 120 to 130°C (for example, 125°C). The solvent is added and dropped three times as described above, and pressure (for example, 10 kgf / cm²) is applied to the sample using a syringe-like container. 2 Below, 5kgf / cm 2 Below or 2-4 kgf / cm² 2 Add ) and press the sample once. This will thoroughly extrude the solvent and emulsion present in the sample. Apply pressure to squeeze out the sample until no more solvent comes out. Then, store the plate in a desiccator for 5 to 10 minutes and measure the weight of the plate with the sample (plate weight B). Then, calculate the emulsion content using the following formula.

[0089] <expression> Emulsion content by extrusion (OPU, % or wt%) ={(Plate weight B - Plate weight A) / (Sample weight)}×100

[0090] Furthermore, the lyocell material that serves as the basis for the emulsion content may be at least an emulsion-treated lyocell multifilament. For example, the lyocell material may be a lyocell multifilament to which a primary emulsion treatment (described later) has been applied, a lyocell multifilament to which both a primary emulsion treatment and a secondary emulsion treatment (described later) have been applied, or a lyocell multifilament to which both the emulsion treatment described above and a binder (described later) have been applied. And, as described above, the emulsion and / or binder-treated lyocell multifilament may be crimped.

[0091] In relation to the emulsion of the present invention, component (a) is a compound that functions as a type of lubricant or oil, and is harmless to the human body as long as it is used in food. Component (a) provides lubrication to the fibers fed into the crimper. If the lubrication is insufficient, the lyocell will not be able to escape from the crimper as it aggregates, and if the lubrication is excessively high, there is a problem in that the crimp will not form properly. The content of component (a) can be controlled as described later, taking these functions into consideration.

[0092] In relation to component (a) above, the type of aliphatic having 16 or more carbon atoms that forms it is not particularly limited. Fatty acids having 16 or more carbon atoms that provide esterified products that are harmless to the human body and are suitable for use in food may be used.

[0093] For example, saturated fatty acids and / or unsaturated fatty acids can be used as fatty acids with 16 or more carbon atoms.

[0094] Examples of saturated fatty acids include 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 that can be used are not limited to these.

[0095] Examples of unsaturated fatty acids include, for example, palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), linoleic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32 O2), etc. However, the types of saturated fatty acids that can be used are not limited to these.

[0096] The upper limit of the carbon number of the fatty acid having 16 or more carbon atoms is not particularly limited, but can be, for example, 4*0 or less, 36 or less, 32 or less, 28 or less, 24 or less, or 20 or less.

[0097]

[0098] For example, they are saturated aliphatic alcohols or unsaturated aliphatic alcohols, and these may have a linear or branched shape.

[0099] As an example, the carbon number of the aliphatic monohydric alcohol can be from 1 to 40. Specifically, the carbon number of the aliphatic monohydric alcohol can be, for example, 4 or more, 8 or more, 12 or more, 16 or more, 20 or more. <xxx="0000448"> Examples of such aliphatic monohydric alcohols include, for example, methanol, ethanol, butanol, lauryl alcohol, isotridecanol, or stearyl alcohol, etc., but are not limited to these.

[0101] In specific examples of the present invention, component (a) may be an ester of isotridecanol and stearic acid (for example, isotridecyl stearate). However, the types of component (a) that can be used are not limited thereto.

[0102] As will be described later, the content of component (a) in the emulsion may be adjusted considering the function of the emulsion or the function of component (a).

[0103] The aforementioned component (b), namely the esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, is a compound that functions as a type of emulsifier and is harmless to the human body to the extent that it can be used in food.

[0104] Such component (b) possesses both hydrophilicity and hydrophobicity due to the polyhydric alcohol (i.e., sorbitan), and thus disperses component (a), which imparts lubricity to the fibers, well in water, as described later. Furthermore, as mentioned above, components (a) and (b), when used together, not only improve the dispersibility of the emulsion but also lower the melting point, thereby ensuring the handling and stability of the emulsion. The content of component (b) can be controlled as described later, taking these functions into consideration.

[0105] In relation to component (b) above, the type of fatty acid having 16 or more carbon atoms that forms it is not particularly limited. Fatty acids having 16 or more carbon atoms that provide esterified products that are harmless to the human body to the extent that they can be used in food may be used.

[0106] For example, saturated fatty acids and / or unsaturated fatty acids can be used as fatty acids with 16 or more carbon atoms.

[0107] Examples of saturated fatty acids include palmitic acid (hexadecanoic acid, CH3(CH2) 14 COOH), margaric acid (heptadecanoic acid, CH3(CH2) 15 COOH), stearic acid (octadecanoic acid, CH3(CH2)) 16COOH), 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 that can be used are not limited to these.

[0108] Examples of unsaturated fatty acids include palmitoleic acid (CH3(CH2)5CH=CH(CH2)7COOH), oleic acid (CH3(CH2)7CH=CH(CH2)7COOH), and lunolic acid (C 18 H 32 O2) or arachidonic acid (C 20 H 32 Examples include O2. However, the types of saturated fatty acids that can be used are not limited to these.

[0109] The upper limit of the number of carbon atoms in fatty acids with 16 or more carbon atoms is not specifically limited, but it could be, for example, 40 or less, 36 or less, 32 or less, 28 or less, 24 or less, or 20 or less.

[0110] In specific examples of the present invention, component (b) may be an ester of sorbitan and oleic acid (for example, sorbitan monooleate). However, the types of component (b) that can be used are not limited thereto.

[0111] (b) The content of component (b) can be adjusted considering the functions of component (b) and the emulsion as described above.

[0112] As an example, the emulsion may contain 20 to 60 parts by weight of (b) an ester of sorbitan and a fatty acid having 16 or more carbon atoms, with respect to 100 parts by weight of (a) an ester of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol.

[0113] Specifically, the emulsion of the present invention may contain 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 of component (b) relative to 100 parts by weight of component (a). The upper limit of the content of component (b) relative to 100 parts by weight of 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 is hydrophobic, and as a result, the electrostatic properties measured from the surface of the lyocell tow can be adjusted.

[0114] As an example, the emulsion may further contain an alkylene oxide adduct to component (b) as component (c). Such component (c) can function as a type of emulsifier. This compound may also be selected from those that are harmless to the human body to the extent that they can be used in food.

[0115] In relation to component (c) above, the type of alkylene oxide is not particularly limited, but for example, the number of carbon atoms in the alkylene oxide may be 2 to 4. Specifically, in relation to component (c) above, ethylene oxide, propylene oxide and / or butylene oxide are used, but are not limited to these.

[0116] The number of moles of alkylene oxide added is not particularly limited. For example, it could be 1 to 100, 5 to 80, 10 to 60, or 15 to 40.

[0117] In specific examples of the present invention, the component (c) may be an esterified product of a sorbitan PEO adduct and oleic acid (for example, polyoxyethylene sorbitan monooleate). However, the types of components (c) that can be used are not limited thereto.

[0118] For example, component (c) may be used during the manufacturing process of filters for smoking articles to further reduce the electrostatic properties of lyocell staples. Specifically, moisture can be adsorbed onto the fiber surface by units derived from alkylene oxide, thereby suppressing the generation of static electricity. Component (c) also plays a role in helping the emulsion disperse effectively in water.

[0119] The content of component (c) can be adjusted considering the functions of component (c) and the emulsion as described above.

[0120] As an example, the emulsion may contain 10 to 50 parts by weight of the alkylene oxide adduct to the esterified product (b) (c) with respect to 100 parts by weight of the esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol (a) (c).

[0121] Specifically, the emulsion of the present invention may contain 15 parts by weight or more, 20 parts by weight or more, 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, or 45 parts by weight or more of component (c) per 100 parts by weight of component (a). The upper limit of the content of component (c) per 100 parts by weight of component (a) may be, for example, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, 25 parts by weight or less, 20 parts by weight or less, or 15 parts by weight or less.

[0122] As an example, the emulsion may contain (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms in an excess amount compared to (c) an alkylene oxide adduct to the esterified product (b).

[0123] As an example, the emulsion may contain 40 to 80% by weight of (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, based on 100% by weight of the total weight of the emulsion. Specifically, based on 100% by weight of the total weight of the emulsion, the content of component (a) may be 45% or more by weight, 50% or more by weight, 55% or more by weight, 60% or more by weight, or 65% or more by weight, 70% or more by weight, or 75% or more by weight. The upper limit of its content may be, for example, 75% or less by weight, 70% or less by weight, 65% or less by weight, 60% or less by weight, 55% or less by weight, 50% or less by weight, or 45% or less by weight.

[0124] For example, the emulsion may contain component (a) in the most excessive amount among components (a) to (c).

[0125] As an example, the emulsion may contain 15 to 55% by weight of (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, based on 100% by weight of the total weight of the emulsion. Specifically, based on 100% by weight of the total weight of the emulsion, the content of component (b) may be 20% or more by weight, 25% or more by weight, 30% or more by weight, 35% or more by weight, 40% or more by weight, 45% or more by weight, or 50% or more by weight. The upper limit of its content may be, for example, 50% or less by weight, 45% or less by weight, 40% or less by weight, 35% or less by weight, 30% or less by weight, or 25% or less by weight.

[0126] As an example, the emulsion may contain 10 to 30% by weight of component (c), i.e., an alkylene oxide adduct to (b), based on 100% by weight of the total weight of the emulsion. Specifically, based on 100% by weight of the total weight of the emulsion, the content of component (c) may be 15% or more by weight, 20% or more by weight, or 25% or more by weight. The upper limit of its content may be, for example, 25% or less by weight, 20% or less by weight, or 15% or less by weight.

[0127] As an example, the emulsion may contain at least 15% by weight of (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms, and (c) an alkylene oxide adduct to (b), based on 100% by weight of the total weight of the emulsion. Specifically, based on 100% by weight of the total weight of the emulsion, the total content of components (b) and (c) may be 20% by weight or more, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more, or 50% by weight or more. The upper limit of the content may be, for example, 55% by weight or less, 50% by weight or less, 45% by weight or less, 40% by weight or less, 35% by weight or less, 30% by weight or less, or 25% by weight or less.

[0128] As an example, the emulsion may further contain (d) water. As will be described later, the small amount of water used helps with emulsification.

[0129] The water content is not specifically limited, but it is limited to the amount remaining after subtracting the total content of components (a) to (c) from 100% by weight of the total emulsion. The amount of water contained in the emulsion (i.e., the amount remaining after subtracting the total content of the remaining components excluding water) may be, for example, 10% by weight or less, 9% by weight or less, 8% by weight or less, 7% by weight or less, 6% by weight or less, 5% by weight or less, 4% by weight or less, 3% by weight or less, 2% by weight or less, or 1% by weight or less. The lower limit may be, for example, 0% by weight or more, 0.1% by weight or more, 0.5% by weight or more, or 1% by weight or more.

[0130] The lyocell material of the present invention is a crimped tow with a fineness suitable for the manufacture of filters for smoking articles and ensuring their function. For example, the total fineness of the tow is a factor related to the amount of filament that can be placed inside the filter paper. If the total fineness is too low, a sufficient amount of filament will not be filled into the filter paper, and the suction resistance properties will decrease. If the total fineness is too high, the amount filled into the filter paper will increase excessively, causing the filter paper to tear or making it difficult to adjust the amount of tow filling to achieve the required suction resistance of the filter.

[0131] As an example, the single denier of the filaments constituting the lyocell multifilament may be 1.5 to 8.0 denier. In this case, the single denier of the filament refers to the denier of a single monofilament separated from the multifilament.

[0132] Specifically, the single fiber thickness of the filament may be, for example, 7.5 denier or less, 7.0 denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier or less, 4.5 denier or less, 3.5 denier or less, or 3.0 denier or less. The lower limit may be, for example, 2.0 denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier or more, 4.5 denier or more, 5.0 denier or more, 5.5 denier or more, or 6.0 denier or more. Satisfying the above range may be more advantageous in ensuring stable physical properties (e.g., hardness or suction resistance) and processability of the filter for smoking articles.

[0133] As an example, the crimped lyocell multifilament is a crimped fiber with a total fineness of 15,000 to 45,000 denier. For example, the lower limit of the total fineness is, for example, 16,000 or more, 16,500 or more, 17,000 or more, 17,500 or more, 18,000 or more, 18,500 or more, 19,000 or more, 19,500 or more, 20,000 or more, 20,500 or more, 21,000 or more, 21,500 or more, 22,000 or more, 22,500 or more, 23,000 or more, 23,500 or more, 24,000 or more, 24,500 or more, 25,000 or more, 25,500 or more, 26,000 or more, 26,500 or more, 27,000 or more, 27,500 or more, 28,000 or more, 28,500 or more, 29,000 or more, 29,500 or more. The above may be 30,000 or more, 30,500 or more, 31,000 or more, 31,500 or more, 32,000 or more, 32,500 or more, 33,000 or more, 33,500 or more, 34,000 or more, 34,500 or more, 35,000 or more, 35,500 or more, 36,000 or more, 36,500 or more, 37,000 or more, 37,500 or more, 38,000 or more, 38,500 or more, 39,000 or more, 39,500 or more, 40,000 or more, 40,500 or more, 41,000 or more, 41,500 or more, 42,000 or more, 42,500 or more, 43,000 or more, 43,500 or more, or 44,000 or more.And the upper limit is, for example, 44,500 or less, 44,000 or less, 43,500 or less, 43,000 or less, 42,500 or less, 42,000 or less, 41,500 or less, 41,000 or less, 40,500 or less, 40,000 or less, 39,500 or less, 39,000 or less, 38,500 or less, 38,000 or less, 37,500 or less, 37,000 or less, 36,500 or less, 36,000 or less, 35,500 or less, 35,000 or less, 34,500 or less, 34,000 or less, 33,500 or less, 33,000 or less, 32,500 or less, 32,000 or less, 31,500 or less, 31,000 or less, 30,500 or less, 3 It can be 0,000 or less, 29,500 or less, 29,000 or less, 28,500 or less, 28,000 or less, 27,500 or less, 27,000 or less, 26,500 or less, 26,000 or less, 25,500 or less, 25,000 or less, 24,500 or less, 24,000 or less, 23,500 or less, 23,000 or less, 22,500 or less, 22,000 or less, 21,500 or less, 21,000 or less, 20,500 or less, 20,000 or less, 19,500 or less, 19,000 or less, 18,500 or less, 18,000 or less, 17,500 or less, 17,000 or less, 16,500 or less, 16,000 or less, or 15,500 or less. If the total fineness of the tow deviates from the aforementioned range, the processability for manufacturing filters for smoking articles is poor (continuous process with cutting threads is not possible), and when manufacturing filters for smoking articles, it becomes difficult to ensure sufficient physical properties of the filter (e.g., hardness or suction resistance) as the amount of tow filled into the filter wrapping paper becomes excessively small or large.

[0134] There are no particular restrictions on the method for measuring fineness, but for example, a 2m sample of the tow to be measured is taken and stabilized for 24 hours in a temperature- and humidity-controlled room at 20°C and 65% humidity. One end of the stabilized tow is fixed, and a drill with a 2kg load is attached to the other end. After holding the tow in its stretched state due to the load for 5 seconds (stabilization), it is cut at 90cm to obtain a sample, and the weight of the sample is measured (total fineness). Fineness is converted by multiplying the measured weight by 10000 using the denier conversion method. Dividing the total fineness by the number of filament bundles gives the single fineness.

[0135] The total fineness of the tow, as described above, can be determined by the single fineness and crimp number of the filaments. In the method of the present invention, since the single fineness and crimp number are controlled as described above, it is possible to secure the total fineness of the tow, which is suitable for the manufacture of filters for smoking articles and for ensuring their function.

[0136] As an example, the crimped lyocell multifilament may have 20 to 50 crimps per inch. For example, the number of crimps may be 25ea / inch or more, 30ea / inch or more, 35ea / inch or more, 40ea / inch or more, or 45ea / inch or more, with an upper limit of, for example, 45ea / inch or less, 40ea / inch or less, 35ea / inch or less, 30ea / inch or less, or 25ea / inch or less. The number of crimps and their uniformity can be controlled through pressure and temperature conditions related to the crimping step, which will be described later.

[0137] While not specifically limited, the crimp count can be measured, for example, according to the KS K 0326 standard. Specifically, 20 tow samples with undamaged crimps are taken, and pre-prepared glossy paper strips (space distance 25 mm) are attached to each single fiber using 4-5% amyl acetate celluloid adhesive, stretching by 25 ± 5% relative to the attachment length. The strips are then left to dry. A crimp tester is then used to apply an initial load equivalent to 1.96 / 1000 cN (= 2 mgf) per denier to each sample, and the crimp count over 25 mm is determined. In this case, the crimp count can be expressed by the upper and lower limits of the crimp counts measured for the 20 samples. Alternatively, the crimp count may be expressed by the arithmetic mean of the crimp counts measured for the 20 samples.

[0138] While not specifically limited, lyocell material manufactured as described above may be used in filters for smoking items.

[0139] As an example, the lyocell material may further include a binder. The binder may be present, for example, on the surface of the crimped lyocell multifilament or between the crimped lyocell multifilament (or monofilament). The binder can further increase the hardness of the smoking article filters manufactured by the tow, thereby preventing problems such as filter clogging during the filter manufacturing process or the manufacturing process of smoking articles (e.g., cigarettes).

[0140] The types of binders that can be used are not particularly limited, and any known binders may be used as long as they do not hinder the purpose of the present invention. For example, binders that provide sufficient compatibility with the emulsion used in the present invention, improve the hardness of the filter, and provide excellent binding strength may be used.

[0141] As an example, the binder may include a polyester-based binder, a cellulose-based binder, and / or a vinyl-based binder.

[0142] While not particularly limited, polyester binders may include one or more selected from the group consisting of alkylenes, arylenes, and heteroarylenes having 5 to 12 carbon atoms.

[0143] Examples of cellulosic binders that may be used include, but are not limited to, hydroxypropyl methylcellulose (HPMC), ethylcellulose (EC), and / or methylcellulose (MC), and carboxymethylcellulose (CMC).

[0144] Examples of vinyl binders that may be used include, but are not limited to, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and / or ethylene vinyl acetate (EVAc).

[0145] The method for applying (coating) the aforementioned binder to the lyocell material will be described later.

[0146] As yet another example relating to the present invention, the present invention relates to a method for producing lyocell material. By this method, the lyocell material for smoking article filters described above can be produced.

[0147] Furthermore, since the emulsion of the present invention has high compatibility with binders, it can embody the physical properties (e.g., hardness or suction resistance) required for various smoking products (e.g., cigarettes).

[0148] Specifically, the method for producing the lyocell material includes the steps of emulsion treatment of lyocell multifilaments and crimping of the lyocell multifilaments. The emulsion comprises at least (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 an aliphatic acid having 16 or more carbon atoms.

[0149] The emulsion treatment is carried out, for example, by spraying an emulsion of the above-described composition onto a lyocell filament, or by immersing the lyocell filament in the emulsion. The method of the present invention, including the emulsion treatment, is carried out so that the emulsion content (e.g., OPU (wt%)) in the lyocell material satisfies a predetermined range described later.

[0150] Furthermore, the crimping step is carried out, for example, by applying steam and / or pressure to the lyocell multifilament.

[0151] The explanation regarding the emulsion components is as described above, so it will be omitted here.

[0152] A method for producing lyocell material according to a specific example of the present invention, including an emulsion treatment step and a crimping step, will be described in more detail below. The method of the present invention is carried out by including one or more of the steps described later.

[0153] Lyocell doping spinning step (a) The step involves spinning a lyocell spinning dope containing lyocell cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO).

[0154] Commercially available cellulose acetate filters have been identified as a major cause of microplastic generation. However, the amine oxide solvents used in the production of lyocell fibers are recyclable and biodegradable upon disposal, meaning that lyocell materials do not generate any pollutants during their production process. Furthermore, since lyocell fibers are biodegraded and removed relatively quickly, lyocell is a more environmentally friendly material than cellulose acetate.

[0155] As an example, the cellulose content in the spinning dope is 5 to 15% by weight, based on 100% by weight of the total dope weight. If the cellulose content is excessively low, it is difficult to realize the properties of lyocell fibers, and if the content exceeds the above range, it is difficult to dissolve in the solvent. Taking this into consideration, the cellulose content in the spinning dope is 6% by weight or more, 7% by weight or more, 8% by weight or more, 9% by weight or more, or 10% by weight or more, and its upper limit may be, for example, 14% by weight or less, 13% by weight or less, 12% by weight or less, 11% by weight or less, 10% by weight or less, or 9% by weight or less.

[0156] As an example, the spinning dope may contain an aqueous solution of N-methylmorpholine-N-oxide (NMMO). The aqueous solution may contain, for example, 80 to 95% by weight of N-methylmorpholine-N-oxide and 5 to 20% by weight of water, taking into consideration the solubility of cellulose and the process temperature.

[0157] As an example, the cellulose or cellulose pulp may have an alpha-cellulose content of 85 to 97% by weight compared to 100% by weight of total cellulose.

[0158] Furthermore, in a specific example of the present invention, the degree of polymerization (DPw) of the cellulose may be 600 to 1700.

[0159] In the spinning step, the shape of the spinneret for extruding the spinning dope is not particularly limited. For example, a donut-shaped spinneret may be used.

[0160] The nozzle temperature of the spinneret, specifically the spinning temperature, can be appropriately selected by those skilled in the art. Considering that the viscosity of the spinning dope may change with the spinning temperature and may not be extruded properly, the spinning temperature can be, for example, 100°C to 120°C or below, or 100°C to 110°C or below.

[0161] As an example, the step of spinning the spinning dope may be carried out under spinning conditions controlled so that the monofilament fineness of the filament is 1.5 denier to 8.0 denier or less. For example, one or more spinning conditions, such as the amount of spinning dope discharged and the spinning speed, can be appropriately controlled so that the monofilament fineness of the filament forming the lyocell material satisfies the requirement of 1.5 to 8.0 denier. In this case, the monofilament fineness of the filament refers to the fineness of a single monofilament separated from a multifilament.

[0162] Specifically, the single fiber thickness of the filament is, for example, 7.5 denier or less, 7.0 denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier or less, or 4.5 denier or less. The lower limit may be, for example, 2.0 denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier or more, 4.5 denier or more, 5.0 denier or more, 5.5 denier or more, or 6.0 denier or more. Satisfying the above range is further advantageous in realizing stable suction resistance and ensuring processability of the filter for smoking articles.

[0163] The spinning dope extruded through the spinneret undergoes a coagulation step, which will be described later.

[0164] Coagulation and multifilament acquisition step (b) In this step, the spun lyocell dope is solidified, and lyocell multifilaments can be obtained.

[0165] For the aforementioned coagulation, a method may be used in which the spinning dope comes into contact with air and / or a coagulation solution.

[0166] As an example, the coagulation may include a primary coagulation step of supplying cold air to the spun lyocell dope, and a secondary coagulation step of immersing the primary coagulated spun dope in a coagulation solution to coagulate it.

[0167] By the solidification method described above, the lyocell dope extruded from the spinneret can be primarily solidified in the space (air gap section) between the spinneret and the solidification tank. In such an air gap section, cold air can be supplied, for example, from an air cooling section located inside the spinneret to the outside of the spinneret. In addition, primary solidification can be achieved by so-called air quenching methods or means known in the relevant fields.

[0168] For example, the upper temperature limit for the cold air used for primary solidification is, for instance, 15°C or lower. Specifically, the cold air is air at 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 these limits, the spinning dope with air will not solidify sufficiently, resulting in poor spinning-related process efficiency.

[0169] The lower limit of the cold air temperature can be determined by considering factors such as spinnability and / or uniformity of the filament cross-section. For example, if the cold air temperature is below 4°C, the surface of the spinneret will cool, the surface of the filament will become uneven, and the spinnability will decrease. When considering this, the cold air temperature can be 5°C or higher, 6°C or higher, 7°C or higher, 8°C or higher, or 9°C or higher.

[0170] The degree to which the cold air is supplied can be adjusted considering factors such as sufficient solidification, spinnability, and the effect on the physical properties of the filament. For example, 70 to 300 Nm 3 The derived spinning dope can be supplied at an airflow rate of / h. More specifically, the airflow rate is 100 Nm³.3 / h or more or 150Nm 3 It can be more than / h, and the upper limit of that airflow is, for example, 250Nm 3 / h or less or 200Nm 3 It can be less than or equal to / h.

[0171] After the primary coagulation described above, the cooled spinning dope can be supplied to a coagulation tank or bath containing a coagulation solution (secondary coagulation). For proper coagulation to proceed, the temperature of the coagulation solution is, for example, 30°C or below, or 25°C or below. The temperature of the coagulation solution may be 10°C or above, 15°C or above, or 20°C or above. When the above temperature is maintained, the coagulation rate can be appropriately maintained.

[0172] The type of coagulation solution used for secondary coagulation as described above is not particularly limited. For example, the coagulation solution may contain one or more of water and N-methylmorpholine-N-oxide (NMMO).

[0173] While not specifically limited, when the coagulation solution contains water and NMMO, the water content in the coagulation solution may be 60 to 90% by weight, and the NMMO content may be 10 to 40% by weight. Alternatively, the coagulation solution may contain 70 to 80% by weight of water and 20 to 30% by weight of NMMO. The concentration of such a coagulation solution can be controlled to be maintained throughout the manufacturing process using sensors or the like.

[0174] Water flushing step (c) If necessary, the multifilaments are washed with water after the solidification and multifilament steps described above. Such washing can remove any remaining NMMO and / or other impurities from the filaments.

[0175] The method of washing is not particularly limited. For example, washing may be performed by introducing the solidified lyocell multifilament into a washing tank using a traction roller. Alternatively, washing may be performed by spraying washing solution during the process of moving to the next step using the traction roller.

[0176] The components of the washing solution are not particularly limited. For example, the washing solution may contain water and further contain known additives.

[0177] Furthermore, considering reuse after rinsing, the rinsing solution may be adjusted to a temperature of 100°C or lower before use.

[0178] Emulsion treatment step (d) This step involves applying an emulsion of the above-mentioned components to the surface of the filament. The emulsion treatment reduces friction applied to the filament, allowing for better crimp formation in the crimping step described later. As described later, if the emulsion treatment is performed two or more times, it may be referred to as the primary emulsion treatment and the secondary emulsion treatment depending on the order in which they are performed.

[0179] While not specifically limited, emulsion treatment is carried out by immersing the multifilaments in a bath filled with emulsion so that the multifilaments are completely submerged in the emulsion. Alternatively, emulsion treatment may be carried out by spraying the emulsion liquid during the process of moving to the next step by a tow roller.

[0180] As described above, after emulsion treatment, a further step may be performed in which a roll or the like, located before and / or after the emulsion treatment step, squeezes out the emulsion from the surface of the multifilament so that the amount of emulsion applied to the multifilament remains constant.

[0181] As an example, the emulsion treatment is carried out so that the emulsion content (OPU: oil pick up ratio (weight%)) is 2.0% or more, based on at least 100% by weight of the emulsion-treated multifilament. In this case, the at least emulsion-treated multifilament may be, for example, a lyocell multifilament to which a primary emulsion treatment has been applied, a lyocell multifilament to which both a primary emulsion treatment and a secondary emulsion treatment (see the explanation below for details) have been applied, or a lyocell multifilament to which both the emulsion treatment described above and a binder described later have been applied. Furthermore, as described above, the lyocell multifilament that has been treated with emulsion and / or binder may be crimped.

[0182] Specifically, the emulsion content of at least the emulsion-treated multifilaments may be 0.5% by weight or more, 0.6% by weight or more, 0.62% by weight or more, 1.0% by weight or more, 1.5% by weight or more, 2.0% by weight or more, 2.5% by weight or more, 3.0% by weight or more, specifically 3.5% by weight or more, 4.0% by weight or more, 4.2% by weight or more, 4.5% by weight or more, 5.0% by weight or more, 5.5% by weight or more, 6.0% by weight or more, 6.5% by weight or more, 7.0% by weight or more, 7.5% by weight or more, 8.0% by weight or more, 8.5% by weight or more, 9.0% by weight or more, or 9.5% by weight or more. The upper limit may be, for example, 20.0% by weight or less, 18.0% by weight or less, 17.0% by weight or less, 16.0% by weight or less, 15.0% by weight or less, 14.5% by weight or less, 14.0% by weight or less, 13.5% by weight or less, 13.0% by weight or less, 12.5% ​​by weight or less, 12.0% by weight or less, 11.5% by weight or less, 11.0% by weight or less, 10.5% by weight or less, 10% by weight or less, 9.5% by weight or less, 9.0% by weight or less, 8.5% by weight or less, 8.0% by weight or less, 7.8% by weight or less, 7.6% by weight or less, 7.5% by weight or less, 7.0% by weight or less, or 6.5% by weight or less. In this case, the content refers to the dry weight after the solvent (e.g., water) or liquid component contained in the emulsion has evaporated.

[0183] Based on 100% by weight of emulsion-treated multifilament, the emulsion content (OPU: oil pick-up ratio (by weight)) is 0.6% to 7.5% by weight, preferably 0.62% to 7.5% by weight, more preferably 4.5% to 7.0% by weight, and more preferably 4.9% to 6.0% by weight.

[0184] When an emulsion with the above composition is treated within the aforementioned content range, it complements the hydrophilic properties of the lyocell material, and the electrostatic properties measured from the lyocell material can be adjusted, as will be described later.

[0185] Depending on the circumstances, the emulsion may be dried after the emulsion treatment described above.

[0186] In specific examples relating to the present invention, one or more of the steps described above may be controlled so that the single denier of the filaments constituting the lyocell multifilament is 1.5 to 8.0 denier. The single denier of the filament refers to the denier of a single monofilament separated from the multifilament.

[0187] Specifically, the single fiber thickness of the filament is, for example, 7.5 denier or less, 7.0 denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier or less, or 4.5 denier or less. The lower limit may be, for example, 2.0 denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier or more, 4.5 denier or more, 5.0 denier or more, 5.5 denier or more, or 6.0 denier or more. Satisfying the above range may be more advantageous in realizing stable suction resistance and ensuring processability of the filter for smoking articles.

[0188] The spinning step described above is one that is not specifically limited but is controlled to ensure the aforementioned range of single fineness. Alternatively, any of the spinning, coagulation, washing, and emulsion treatment steps described above may be controlled to ensure the aforementioned range of single fineness.

[0189] crimping step (e) The crimping step is a step in which steam and / or pressure from a roller is applied to the emulsion-treated lyocell multifilament to make it possible to obtain a crimped tow, and may be referred to as the so-called crimping step.

[0190] Crimping imparts waves to the multifilament, allowing the fiber to have bulky properties. Crimping can be performed using known crimping equipment, including a stuffer box and / or steam box, and the usable crimping equipment is not particularly limited, for example, any equipment that applies steam pressure and roll pressure as described later.

[0191] As an example, the crimping step may be carried out by first supplying steam to the lyocell multifilament to preheat and swell it, and then applying pressure to the multifilament with a press roller to form wrinkles in the multifilament. In this case, a steam box is used for steam supply, and such a steam box may be located at the front end of the crimping device.

[0192] As an example, the crimping step can be performed in a manner in which multifilament pressurization by a press roller and steam application are performed simultaneously.

[0193] As an example, the crimping step may be carried out by first supplying steam to the lyocell multifilament to preheat and swell the multifilament, and then simultaneously pressurizing the multifilament with a press roller and applying steam.

[0194] As an example, the crimping step involves applying 0.1 to 2.0 kgf / cm² to the multifilament before feeding it into the crimping device (specifically, the press roller). 2This can be done while adding steam. In a specific example of the present invention, 0.2 kgf / cm 2 More than 0.3kgf / cm 2 The above is 0.4 kgf / cm². 2 More than 0.5kgf / cm 2 Above or above, or 0.6 kgf / cm² 2 The above steam can be supplied by a steam box. Also, 1.5 kgf / cm² 2 Below, 1.4kgf / cm 2 Below, 1.3kgf / cm 2 Below, 1.2kgf / cm 2 Below, 1.1kgf / cm 2 The following or 1.0 kgf / cm² 2 The following steam may be provided. If the steam supply amount or pressure is below the range described above, the crimp may not form smoothly. If it exceeds the range described above, the flexibility of the filament will increase, and the filament will be crimped excessively within the crimping device, making it impossible to pass through the crimping device.

[0195] As an example, the crimping step involves using a roller to apply 1.5 to 4.0 kgf / cm² to the multifilament fed into the crimping device. 2 This can be done while applying pressure. In a specific example of the present invention, 1.6 kgf / cm² 2 More than 1.7kgf / cm 2 More than 1.8kgf / cm 2 The above is 1.9 kgf / cm². 2 The above is 2.0 kgf / cm². 2 Above, 2.1kgf / cm 2 Above, 2.2kgf / cm 2 Above, 2.3kgf / cm 2 The above is 2.4 kgf / cm². 2 Above or above, or 2.5 kgf / cm² 2 The above pressure can be applied to the multifilament by a press roller. Also, 3.9 kgf / cm² 2 Below, 3.8kgf / cm 2 Below, 3.7kgf / cm2 Below, 3.6kgf / cm 2 Below, 3.5kgf / cm 2 Below, 3.4kgf / cm 2 Below, 3.3kgf / cm 2 Below, 3.2kgf / cm 2 Below, 3.1kgf / cm 2 Below, 3.0kgf / cm 2 Below, 2.9kgf / cm 2 Below, 2.8kgf / cm 2 Below, 2.7kgf / cm 2 Below, 2.6kgf / cm 2 The following or 2.5 kgf / cm² 2 The following pressures may be applied. If the roller pressure is below the range, the desired number of crimps may not be sufficiently formed. If the roller pressure exceeds the range, the pressing force may be too strong, preventing the filament from being smoothly fed into the crimping device or passing through the stuffer box. The press roller providing the pressure may cause wrinkles to form in the multifilament.

[0196] As an example, the crimping step may involve a doctor blade that applies a predetermined pressure to the multifilament. The doctor blade adjusts the residence time of the filament fed into the crimper buffer box and contributes to the crimping (which affects tow quality and filter performance). Such a doctor blade may be located, for example, in the path of the multifilament as it is discharged from the roller pressurization point after being pressurized by the roller described above.

[0197] In a specific example of the present invention, the crimping step involves using a doctor blade to apply 0.1 to 2.0 kgf / cm² to the multifilament that has passed through the rollers of the crimping device. 2 This can be done while applying pressure. More specifically, the pressure applied by the doctor blade is 0.2 kgf / cm². 2 More than 0.3kgf / cm 2 The above is 0.4 kgf / cm².2 Above or above, or 0.5 kgf / cm² 2 The above is possible. Furthermore, the upper limit of the pressure may be, for example, 1.5 kgf / cm². 2 Below, 1.4kgf / cm 2 Below, 1.3kgf / cm 2 Below, 1.2kgf / cm 2 Below, 1.1kgf / cm 2 The following or 1.0 kgf / cm² 2 The following are possible:

[0198] For example, the crimping step is performed at a temperature in the range of 120 to 250°C. If the temperature is too low, the crimp shape stabilization effect is poor, and if the temperature is too high, the concentration of retained material in the stuffer box becomes high, making it difficult to form a crimp. Therefore, taking into consideration the steam pressure mentioned above, the temperature can be appropriately controlled within the ranges 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.

[0199] Binder processing step (f) As an example, the method may further include a step of coating an emulsion-treated lyocell multifilament or a lyocell multifilament obtained by a crimping step (i.e., crimped tissue) with a binder.

[0200] When manufacturing filters for smoking products using a tow, a binder is used. The binder increases the hardness of the filters manufactured by the tow and prevents problems such as clogging of the filters during the filter manufacturing process and the tobacco manufacturing process.

[0201] The method for coating the lyocell crimped toe with the binder is not particularly limited. For example, emulsion treatment may be performed by immersing the crimped toe in a bath filled with the binder (or binder solution) so that the multifilaments are completely submerged in the binder. Alternatively, binder coating may be performed by spraying (or atomizing) the binder (or binder solution) using a nozzle.

[0202] The types and components of binders that can be used are as described above, so this will be omitted here.

[0203] As an example, the binder (or binder solution) may further contain 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. If the binder (or binder solution) contains a solvent, the solvent content may be, for example, about 20 to 80% by weight, or 40 to 60% by weight, based on 100% by weight of the total binder (or binder solution).

[0204] The binder treatment described above can be carried out at a level that achieves the objective of the binder treatment as described above. For example, the binder treatment can be carried out so that the binder content is 20% by weight or less, for example, in the range of 8 to 15% by weight, based on 100% by weight of the emulsion and the binder-treated multifilament. In this case, the content may refer to the dry weight after the solvent and liquid components contained in the binder have evaporated.

[0205] After the binder has been coated onto the crimped tissue, drying of the binder may be carried out. The drying temperature is not particularly limited, but for example, drying may be carried out at room temperature (approximately 10 to 35°C).

[0206] Other steps (g) Further appropriate post-processing is performed after crimping.

[0207] As an example, a secondary emulsion treatment (g1) may be performed. The secondary emulsion treatment can prevent static electricity from being generated in the tow and impart flexibility to the tow. The secondary emulsion treatment may be performed in the same manner as or in accordance with the emulsion treatment step (d) described above.

[0208] Specifically, the secondary emulsion treatment can be carried out by applying the emulsion to lyocell tow that has undergone a crimping process. This can function effectively in many processes performed during the manufacture of filters for smoking articles. For example, the secondary emulsion treatment not only ensures that the fibers and filter spread well into the air during the spreading process, but also prevents the fibers from breaking during the drawing process by having the emulsion chains hold the lyocell in place. In order to achieve these advantages, as mentioned above, it is necessary to use fatty acid-derived components with a specified number of carbon atoms or more.

[0209] 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 or not the binder treatment is performed.

[0210] Even when the secondary emulsion treatment described above is performed, the secondary emulsion treatment process may be carried out in such a way that the emulsion content or OPU content in the material satisfies the range described above.

[0211] As an example, a drying process (g2) may be performed. The drying may be carried out at a temperature in the range of 100 to 130°C, for example. The drying method or type is not particularly limited, and known techniques may be used. For example, this may be done by applying hot air to the tow, passing the tow through a temperature-controlled room for a certain period of time, or leaving it to stand.

[0212] According to a specific example of the present invention, a tow with 20 to 50 crimps per inch can be provided by a method including the crimping step described above. For example, the number of crimps may be 25ea / inch or more, 30ea / inch or more, 35ea / inch or more, 40ea / inch or more, or 45ea / inch or more, with an upper limit of, for example, 45ea / inch or less, 40ea / inch or less, 35ea / inch or less, 30ea / inch or less, or 25ea / inch or less. The number of crimps and their uniformity may be controlled by pressure and temperature conditions related to the crimping step described above.

[0213] The manufacturing method of the present invention can provide tow with a fineness appropriate for the manufacture of filters for smoking articles and ensuring their functionality. The total fineness of the tow is a factor related to the amount of filament inserted into the filter wrapping paper. If the total fineness is too low, a sufficient amount of filament will not be filled into the filter wrapping paper, resulting in low suction resistance. If the total fineness is too high, an excessive amount will be filled into the filter wrapping paper, causing the paper to tear or making it difficult to adjust the amount of tow filling to achieve the required suction resistance of the filter. In this regard, according to a specific example of the present invention, a crimped tow with a total fineness of 15,000 to 45,000 denier can be provided. For example, the lower limit of the total fineness may be, for example, 16,000 or more, 17,000 or more, 18,000 or more, 19,000 or more, or 20,000 or more, and the upper limit may be, for example, 40,000 or less, 35,000 or less, 30,000 or less, or 25,000 or less. More specific values ​​are as described above. If the total fineness of the tow deviates from the above range, the processability for manufacturing the smoking article filter is poor (continuous process with cut thread is not possible), and the amount of tow filled into the filter wrapping paper during the manufacture of the smoking article filter becomes excessively small or too large, making it difficult to ensure sufficient filter properties (e.g., suction resistance).

[0214] The total fineness of the tow, as described above, can be determined by the single fineness and crimp number of the filaments. In the method of the present invention, since the single fineness and crimp number are controlled as described above, it is possible to secure the total fineness of the tow suitable for the manufacture of filters for smoking articles and ensuring their functionality.

[0215] While not specifically limited, lyocell materials produced by the above method may be used in filters for smoking articles.

[0216] As yet another example relating to the present invention, the present invention relates to a filter for a smoking article. The filter for the smoking article comprises a lyocell material, the lyocell material being the same as described above.

[0217] Specifically, the smoking article filter of this application is a smoking article filter comprising a lyocell material, the lyocell material comprising crimped lyocell multifilaments and an emulsion coated on the lyocell multifilaments. The emulsion comprises at least (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.

[0218] Furthermore, the lyocell material contains the emulsion in an amount of 0.1% by weight or more relative to 100% by weight of the total lyocell material. Further details regarding the emulsion components and their content in specific examples of the present invention are as described above.

[0219] As an example, the single fiber thickness of the filaments constituting the lyocell multifilament can be between 1.5 and 8.0 denier. The specific values ​​are as described above.

[0220] As an example, the crimped lyocell multifilament may have a total fineness of 15,000 to 45,000 denier. The specific values ​​are as described above.

[0221] As an example, the crimped lyocell multifilament may have 20 to 50 crimps per inch. The specific numbers are as described above.

[0222] As an example, the smoking article filter may further include a binder on the surface of the crimped lyocell multifilament or between the crimped lyocell multifilament. The binder increases the hardness of the smoking article filter manufactured by the tow, preventing problems such as filter clogging during the filter manufacturing process or tobacco manufacturing process. The types, components, and contents of usable binders are described above.

[0223] As an example, the filter for the smoking article may further include a wrapping paper (which may also be called a roll paper, filter paper, or filter wrapping paper). For example, the wrapping paper may be a porous or non-porous paper that encloses the lyocell tow described above (i.e., a tow that is at least emulsion-treated and crimped) and maintains the shape of the filter (e.g., a cylinder or a cylindrical shape).

[0224] For example, when porous wrapping paper is used, the wrapping paper may have a porosity of 10 to 50,000 CU (Coresta Units). Specifically, the lower limit of the porosity of the wrapping paper may be, for example, 1,000 CU or more, 5,000 CU or more, 10,000 CU or more, 15,000 CU or more, 20,000 CU or more, 25,000 CU or more, 30,000 CU or more, 35,000 CU or more, 40,000 CU or more, or 45,000 CU or more, and the upper limit may be, for example, 45,000 CU or less, 40,000 CU or less, 35,000 CU or less, 30,000 CU or less, 25,000 CU or less, or 20,000 CU or less. In a specific example of the present invention, the wrapping paper may have a porosity in the range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0225] For example, the basis weight of the aforementioned roll paper is 15 to 60 g / cm². 2 This is possible. Specifically, the lower limit of the basis weight of the aforementioned roll paper is, for example, 20 g / cm³.2 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 Above or 55 g / cm 2 Above and its 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 Below or 20 g / cm 2 Below can be possible. In a specific example of the present invention, the tissue paper is 16 g / cm 2 Above, 17 g / cm 2 Above, 18 g / cm 2 Above, 19 g / cm 2 Above, 20 g / cm 2 Above or 21 g / cm<​​​​​​​​​​​​​​​​​​​​​​Furthermore, 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.

[0229] In a specific example of the present invention, the filter having the length has 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.

[0230] For example, the filter may have a rod shape. More specifically, the filter for the smoking article may have a cylindrical shape.

[0231] Furthermore, 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.

[0232] In a specific example of the present invention, the filter having the length has 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.

[0233] As an example, the smoking article filter may include lyocell tow (i.e., crimped lyocell multifilament), an emulsion coated on the lyocell multifilament, and filter wrapping paper. The explanation of lyocell tow and emulsion is as described above and will be omitted here.

[0234] The aforementioned wrapping paper is a porous or non-porous paper that encloses the lyocell tow described above (i.e., tow that has been at least emulsion-treated and crimped) and maintains a filter-like shape (e.g., cylindrical or cylindrical).

[0235] For example, when porous wrapping paper is used, the wrapping paper may have a porosity of 10 to 50,000 CU (Coresta Units). Specifically, the lower limit of the porosity of the wrapping paper may be, for example, 1,000 CU or more, 5,000 CU or more, 10,000 CU or more, 15,000 CU or more, 20,000 CU or more, 25,000 CU or more, 30,000 CU or more, 35,000 CU or more, 40,000 CU or more, or 45,000 CU or more, and the upper limit may be, for example, 45,000 CU or less, 40,000 CU or less, 35,000 CU or less, 30,000 CU or less, 25,000 CU or less, or 20,000 CU or less. In a specific example of the present invention, the wrapping paper may have a porosity in the range of 22,000 to 26,000 CU or 23,000 to 25,000 CU.

[0236] For example, the basis weight of the aforementioned roll paper is 15 to 60 g / cm². 2 This is possible. Specifically, the lower limit of the basis weight of the aforementioned roll paper is, for example, 20 g / cm³. 2 More than 25g / cm 2 More than 30g / cm 2 Above, 35g / cm 2 More than 40g / cm 2 More than 45g / cm 2 More than 50g / cm 2 or more, or 55 g / cm³ 2 That is all, and the upper limit is, for example, 55 g / cm³. 2 Below, 50g / cm 2 Below, 45g / cm2 Below 40g / cm 2 Below 35g / cm 2 Below 30g / cm 2 Below, 25g / cm 2 Below or 20g / cm³ 2 The following is possible. In a specific example of the present invention, the roll paper is 16 g / cm³. 2 More than 17g / cm 2 More than 18g / cm 2 Above, 19g / cm 2 More than 20g / cm 2 21 g / cm³ or more 2 And so, 25g / cm³ 2 Below, 24g / cm 2 Below, 23g / cm 2 Below, 22g / cm 2 Below or 21 g / cm³ 2 It may have the following basis weights.

[0237] While not specifically limited, the weight of the rod-shaped filter may be 50 mg or more. Specifically, the weight of the filter may have a lower limit of 100 mg or more, 150 mg or more, or 200 mg or more, and an upper limit of 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.

[0238] Further explanations regarding filters for smoking products and the materials they contain are as described above and will therefore be omitted.

[0239] As yet another example relating to this application, this application relates to a method for manufacturing a filter for a smoking article. The method is a method for manufacturing the lyocell smoking article filter described above, and may include a method for manufacturing the lyocell material described above.

[0240] Specifically, the method for manufacturing a filter for smoking articles according to this application may include the steps of: emulsion treatment of lyocell multifilaments; crimping of lyocell multifilaments; and manufacturing a filter using the crimped lyocell multifilaments.

[0241] Furthermore, in the above method, the emulsion to be treated with multifilaments includes (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.

[0242] Furthermore, according to a specific example of this application, the lyocell multifilament contained in the smoking article filter contains the emulsion in an amount of 0.1% by weight or more relative to 100% by weight of the total lyocell multifilament. In this case, the lyocell multifilament contained in the smoking article filter is at least an emulsion-treated multifilament, for example, the lyocell material is a lyocell multifilament to which primary emulsion treatment has been applied, a lyocell multifilament to which primary and secondary emulsion treatment has been applied, or a lyocell multifilament to which emulsion treatment as described above has been applied along with a binder, which will be described later. And, as described above, the emulsion and / or binder-treated lyocell multifilament is crimped. The specific numerical values ​​regarding the emulsion content are as described above.

[0243] Regarding the method for manufacturing filters for smoking articles, the remaining steps, excluding the step of manufacturing the filter, are the same as those described above for the lyocell material, and therefore their explanation will be omitted. Furthermore, any explanations that overlap with those described above will also be omitted.

[0244] The step of manufacturing the filter can be appropriately carried out by those skilled in the art by known methods. For example, the filter can be manufactured in a manner of making a roll paper filled with tow into a rod shape. Alternatively, the filter can be manufactured by cutting a filter paper filled with tow having a rod shape to an appropriate length. The description of the roll paper is as described above.

[0245] Although not particularly limited, before filling the filter paper with tow, further degreasing and plasticizer treatment of the tow are carried out.

[0246] In still other specific examples of the present invention, the present invention relates to a smoking article containing a lyocell material. The lyocell material has the configuration and / or characteristics as described above, and the description thereof is omitted.

[0247] In still other specific examples of the present invention, the present invention relates to a smoking article containing a filter for a smoking article. The filter for a smoking article has the configuration and / or characteristics as described above, and the description thereof is omitted.

[0248] As still another example of the present invention, the present invention relates to an emulsion applied (for example, coated) to lyocell tow. The emulsion of the present invention can overcome the hydrophilicity of the surface of the lyocell material for a smoking article filter and can adjust the electrostatic properties of the surface of the lyocell material.

[0249] In a specific example of the present invention, the emulsion contains (a) an esterified product of a fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) an esterified product of sorbitan and a fatty acid having 16 or more carbon atoms. As another example, the emulsion may further contain (c) a component which is an alkylene oxide adduct to the component (b).

[0250] Since the specific description of each component contained in the emulsion is as described above, this is omitted.

[0251] Friction method In an exemplary lyocell material for a smoking article filter, the electrostatic value can be measured by the friction method. The friction method is a method for measuring the electrostatic charge generated from the lyocell material by friction. Through the electrostatic value measured by the friction method, the properties of the lyocell material, such as its spreading properties, can be predicted, and it can be predicted whether the lyocell material can be appropriately used in the manufacture of filters.

[0252] For example, the friction method may be performed immediately after the manufacture of the lyocell material or after the lyocell material has undergone a pretreatment process. Specifically, the friction method may be performed after the lyocell material has been dried for a certain period of time. Alternatively, the friction method may be performed after the lyocell material has been exposed to certain temperature and humidity conditions for a certain period of time.

[0253] For example, lyocell material can be dried at temperatures above 100°C for more than one hour. Also, lyocell material can be exposed to temperatures above 20°C for more than one hour. Furthermore, lyocell material can be exposed to humidity levels above 35% RH for more than one hour.

[0254] Therefore, as an example, the friction method is a method for measuring static electricity generated from dried lyocell material. Furthermore, the friction method is a method for measuring static electricity generated under temperature conditions of approximately 21°C. Also, the friction method is a method for measuring static electricity generated under humidity conditions of approximately 35% RH.

[0255] On the other hand, friction for static electricity generation can occur under conditions where at least a portion of the lyocell material is pressurized. Furthermore, as a non-limiting example, the pressurization of the lyocell material can be achieved by the load of a wear wheel. For example, the load applied to at least a portion of the lyocell material could be approximately 200g to 300g, specifically, about 250g.

[0256] For example, the wear wheel may be an elastic wear wheel. Furthermore, the number of wear particles per unit area of ​​the wear wheel may be approximately 1400 to 1500. As an example of a wear wheel, Taber's CS10 can be considered.

[0257] On the other hand, friction between the lyocell material and the wear wheel may be generated by the rotation of the lyocell material or by the rotation of the wear wheel. Furthermore, the lyocell material or the wear wheel may be rotated at a speed of approximately 40 cycles / min to approximately 80 cycles / min. Specifically, the lyocell material or the wear wheel may be rotated at a speed of approximately 60 cycles / min. Friction may be generated between the lyocell material and the wear wheel due to the rotation of the lyocell material and / or the wear wheel. In addition, static electricity may be induced and measured on the surface of the lyocell material due to friction.

[0258] On the other hand, static electricity can be measured immediately after the lyocell material or wear wheel has been rotated approximately 5 to 50 times. Specifically, static electricity can be measured immediately after the lyocell material or wear wheel has been rotated approximately 10 to 30 times.

[0259] On the other hand, the static electricity of the lyocell material is measured by an electrostatic measuring instrument, which may be located away from the lyocell material. Specifically, the electrostatic measuring instrument may be placed on one surface of the lyocell material. Furthermore, the long axis of the electrostatic measuring instrument and a hypothetical plane parallel to the rotational direction of the lyocell material may intersect each other. More specifically, the long axis of the electrostatic measuring instrument and a hypothetical plane parallel to the rotational direction of the lyocell material may be perpendicular to each other.

[0260] On the other hand, the electrostatic measuring instrument is positioned approximately 0.1 cm to 10 cm away from the lyocell material, and specifically, it may be positioned approximately 5 cm away.

[0261] On the other hand, as an example of an electrostatic measuring instrument, the FMX-004 from SIMCO-ION can be considered. [Effects of the Invention]

[0262] 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 containing the same are provided. Specifically, the present application not only provides a lyocell material excellent in manufacturing processability and uniformity, but also has the effect of the invention of improving the filter performance and the physical properties of smoking articles (for example, tobacco).

Embodiment for Carrying out the Invention

[0263] Hereinafter, the actions and effects of the invention will be more specifically described through specific examples of the invention. However, this is presented as an exemplification of the invention, and the scope of rights of the invention is not limited in any sense thereby.

[0264] A lyocell material was produced through a process such as the following production example. Conditions not specifically mentioned are carried out within the scope of the above description.

[0265] <Production Example> Cellulose pulp with an alpha cellulose content of 93.9% and a degree of polymerization (DPw) of 820 was mixed with a NMMO / H2O solvent with a propyl gallate content of 0.01 wt% to produce a spinning dope for production with a concentration of 11 wt%. Then, while maintaining the spinning temperature at 110 °C with a spinning nozzle, the discharge amount and the spinning speed were appropriately adjusted to spin the spinning dope.

[0266] The spinning dope on the filament discharged from the spinning nozzle was supplied to a coagulating liquid (a coagulating liquid having a concentration containing 75 wt% of water and 25 wt% of NMMO and having a temperature of about 25 °C) in a coagulation tank through an air gap section. At this time, the cold air in the air gap section primarily coagulates the spinning dope at a temperature of 8 °C and an air volume of 200 Nm 3 / h. Also, the concentration of the coagulating liquid was continuously monitored using a sensor and a refractometer.

[0267] Next, the solidified lyocell filament was washed with water. Specifically, the filament was introduced into a traction roller, and any remaining NMMO in the filament was removed by a washing solution sprayed from a washing device. Then, the washed filament was immersed in a bath designed with a predetermined emulsion concentration.

[0268] A nip roll installed in the bus discharge section feeds the filament at 2 kgf / cm². 2 The fabric was processed under pressure and then placed in a crimping machine to create wrinkles. Specifically, a steam pressure of 0.5 kgf / cm² was applied to a steam box. 2 The supply is set to a pressure of 2.5 kgf / cm² for the crimping device rollers. 2 The pressure of the adjustable blade (doctor blade) is 0.5 kgf / cm². 2 The tou was manufactured using this setting.

[0269] The manufactured tofu was subjected to a secondary emulsion treatment to provide antistatic properties and flexibility, and immediately after treatment, the tofu product was obtained by passing it through a continuous drying apparatus set to 120°C.

[0270] The manufactured tow has a single denier of 3.0 to 3.5, a total denier of 36,000 to 40,000, and a crimp count of 25 to 35 ea / inch.

[0271] For reference, the types (components) of emulsions treated in each example and comparative example, and / or emulsion treatment positions (OPU), differ from one another as follows.

[0272] <Example 1> As in the above manufacturing example, emulsion-treated lyocell tofu was used. However, the emulsion used during tofu production contained approximately 60% by weight of isotridecyl stearate, approximately 22% by weight of sorbitan monooleate, approximately 16% by weight of polyoxyethylene sorbitan monooleate, and the remainder of water, with OPU being 0.62% by weight.

[0273] <Example 2> Lyocellus was used in the same manner as in Example 1, except that the OPU was 4.20% by weight.

[0274] <Example 3> Lyocellus was used in the same manner as in Example 1, except that the OPU was 4.90% by weight.

[0275] <Example 4> The same lyocell tow as in Example 1 was used, except that the OPU was 6.00% by weight.

[0276] <Comparative Example 1> Lyocell tow was used in the same manner as in Example 1, except that the OPU was 7.60% by weight.

[0277] <Experiment 1: Evaluation of the electrostatic properties of pre-treated lyoceltou> The lyocell tows produced in Examples 1 to 4 and Comparative Example 1 were left for 24 hours at a temperature of 21°C and a humidity of 35% RH. Subsequently, each lyocell tow was mounted on a Taber wear testing machine, with Taber's CS10 used as the wear wheel.

[0278] The load applied to the lyocell tow was 250g, the rotation speed of the lyocell tow was 60 cycles / min, and the lyocell tow was rotated 10 or 30 times.

[0279] The electrostatic meter (FMX-004 from SIMCO-ION) was placed on one surface of the lyocell tow, with a distance of approximately 5 cm between the lyocell tow and the electrostatic meter. The static electricity measured from the electrostatic meter is shown in Table 1 below.

[0280] On the other hand, by replicating the filter manufacturing process, the lyocell tows of each evaluation example shown in Table 1 were spread onto a primary or tertiary air spreader, and the spreading characteristics of the lyocell material were evaluated during the process of the spread lyocell tow being transported by a transfer roll. The spreading characteristics of the lyocell material were evaluated by visual observation. Specifically, if the lyocell tow was spread unevenly on the sides in terms of thickness and / or width, and aggregation of the emulsion was observed, or if aggregation of the lyocell multifilaments was observed, the spreading characteristics were evaluated as normal or poor.

[0281] Furthermore, if the lyocell material was not sufficiently spread to the point where additional processing was impossible, the spreading characteristics of the lyocell material were evaluated as poor.

[0282] [Table 1]

[0283] Referring to Table 1 above, it can be confirmed that the electrostatic value measured by the friction method at 25°C and 35%RH from the lyocell material of Comparative Example 1 was only 0.08kV. Furthermore, the lyocell material of Comparative Example 1, with an electrostatic value of 0.08kV, was evaluated as having poor spreading characteristics. Specifically, according to Evaluation Examples 9 and 10, it was observed with the naked eye that gaps of more than 20% were formed between the lyocell materials of Comparative Example 1 during the unfolding process by the air spreader. In addition, it was confirmed that in the case of the lyocell material of Comparative Example 1, the lyocell material was not collected below the diameter radius of the filter winding paper during the unfolding process by the TTJ.

[0284] <Experiment 2: Evaluation of the electrostatic properties of dried lyocellus> The lyocell tows produced in Examples 1 to 4 and Comparative Example 1 were each dried at approximately 105°C for approximately 1 hour. Subsequently, each lyocell tow was mounted on a Taber wear testing machine, and Taber's CS10 was used as the wear wheel.

[0285] The load applied to the lyocell tow was 250g, the rotation speed of the lyocell tow was 60 cycles / min, and the lyocell tow was rotated 10 or 30 times.

[0286] The electrostatic meter (FMX-004 from SIMCO-ION) was placed on one surface of the lyocell tow, with a distance of approximately 5 cm between the lyocell tow and the electrostatic meter. The static electricity measured by the electrostatic meter is shown in Table 2 below.

[0287] On the other hand, the lyocell tow of each evaluation example shown in Table 2 was unfolded by replicating the filter manufacturing process, and the spreading characteristics of the unfolded lyocell tow were evaluated. If the lyocell tow was unfolded unevenly on the sides in terms of thickness and / or width, or if plies were observed during the process of manufacturing the filter from the lyocell tow, the spreading characteristics were evaluated as poor.

[0288] [Table 2]

[0289] Referring to Table 2 above, it can be confirmed that the electrostatic value measured by the friction method from the lyocell material of Comparative Example 1, which was dried at 105°C for approximately 1 hour, was 1.14 kV. Furthermore, the lyocell material of Comparative Example 1, with an electrostatic value of 1.14 kV, was evaluated as having particularly poor spreading characteristics.

[0290] Specifically, according to Evaluation Example 20, it was observed with the naked eye that more than 20% of void space was formed between the lyocell materials of Comparative Example 1 during the unfolding process using the air spreader. Furthermore, according to Evaluation Example 20, in the case of the lyocell material of Comparative Example 1, it was confirmed that the lyocell material was not gathered below the diameter radius of the filter wrapping paper during the unfolding process using the TTJ, resulting in the formation of excessive void space between the lyocell materials.

[0291] Furthermore, according to Table 2, the evaluation results of the electrostatic value and spreading characteristics with increasing rotational speed showed that the electrostatic characteristics of the lyocell material in Examples 3 and 4 were the most stable.

[0292] From Tables 1 and 2, it can be seen that when the electrostatic value measured by the lyocell material is 0.08kV or less, or 1.14kV or more, the spreading characteristics of the lyocell material deteriorate. On the other hand, in the case of the lyocell materials according to Examples 1 to 4, it can be seen that the change in electrostatic value due to friction is less than that of the lyocell material according to Comparative Example 1, and that the spreading characteristics are maintained well or normally even in harsh environments.

Claims

1. A lyocell material for smoking article filters comprising crimped lyocell multifilaments and an emulsion coated on at least a portion of the lyocell multifilaments, The electrostatic value measured from the lyocell material is between 0.01 kV and 1.4 kV. Lyocell material for smoking filter applications.

2. The electrostatic value is measured by the friction method, as described in claim 1, for the lyocell material for smoking article filters.

3. The friction method is a method for measuring static electricity generated from the lyocell material by friction, as described in claim 2, for a lyocell material for a smoking article filter.

4. The lyocell material for a smoking article filter according to claim 3, wherein the friction occurs under conditions in which at least a portion of the lyocell material is pressurized.

5. The lyocell material for smoking article filters according to claim 1, wherein the emulsion comprises (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.

6. The lyocell material for smoking article filters according to claim 1, wherein the emulsion comprises (a) 100 parts by weight of an esterified fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and (b) 20 to 60 parts by weight of an esterified sorbitan and a fatty acid having 16 or more carbon atoms.

7. The lyocell material for smoking article filters according to claim 1, wherein the emulsion further comprises an alkylene oxide adduct (c) to the esterified product (b).

8. The lyocell material for smoking article filters according to claim 1, wherein the emulsion comprises 100 parts by weight of (a) an esterified fatty acid having 16 or more carbon atoms and an aliphatic monohydric alcohol, and 10 to 50 parts by weight of (c) an alkylene oxide adduct to the esterified product (b).

9. The crimped lyocell multifilament is The lyocell material for a smoking article filter according to claim 1, having a total fineness of 15,000 to 45,000 denier and 20 to 50 crimps per inch.

10. The lyocell material for smoking article filters according to claim 1, wherein the emulsion is contained in an amount of 0.1% by weight or more relative to a total of 100% by weight of the lyocell material for smoking article filters.

11. The lyocell material for smoking article filters according to claim 1, wherein the emulsion is contained in a content of 20% by weight or less relative to a total of 100% by weight of the lyocell material for smoking article filters.

12. A smoking article comprising the lyocell material described in claim 1.

13. A method for producing lyocell material for smoking article filters, comprising the steps of emulsion treatment of lyocell multifilaments and crimping of lyocell multifilaments, A method for manufacturing a lyocell material for a smoking article filter, wherein the emulsion treatment step is performed such that the electrostatic value measured from the lyocell material for the smoking article filter is 0.01 kV to 1.4 kV.

14. The method for producing a lyocell material for a smoking article filter according to claim 13, wherein the emulsion comprises (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.

15. The method for producing a lyocell material for a smoking article filter according to claim 13, wherein the emulsion is included in an amount of 0.1% by weight or more relative to a total of 100% by weight of the lyocell material for a smoking article filter.

16. The method for producing a lyocell material for a smoking article filter according to claim 13, wherein the emulsion is included in a content of 20% by weight or less relative to a total of 100% by weight of the lyocell material for a smoking article filter.

17. A method for producing a lyocell material for a smoking article filter according to claim 13, providing a lyocell multifilament having a total fineness of 15,000 to 45,000 denier and 20 to 50 crimps per inch.

18. This is a filter for smoking items containing lyocell material. The lyocell material comprises crimped lyocell multifilaments and an emulsion coated on the lyocell multifilaments. A filter for smoking items, wherein the electrostatic value measured from the lyocell material is 0.01 kV to 1.4 kV.

19. A smoking article comprising the filter for smoking articles described in claim 18.

20. A method for manufacturing a filter for smoking articles, comprising the steps of: emulsion treatment of lyocell multifilaments; crimping of lyocell multifilaments; and manufacturing a filter using the crimped lyocell multifilaments. A method for manufacturing a filter for a smoking article, wherein the emulsion treatment step is performed such that the electrostatic value measured from the lyocell material for the smoking article filter is 0.01 kV to 1.4 kV.

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