Lyocell material having modified cross-section, cigarette filter, and method for manufacturing same

Abstract

To provide a lyocell material which substitutes for conventional cellulose acetate materials and filters and has not only excellent biodegradability but also excellent filter manufacturing processability and excellent tobacco physical properties (e.g., inhalation resistance), and to provide a tobacco filter including the same.SOLUTION: Technical Field The present application relates to a lyocell material having a modified cross-section, a cigarette filter including the lyocell material, and a method for manufacturing the same.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a modified cross-section lyocell material, a cigarette filter containing the same, and a method for producing the same. Regarding. [Background technology]

[0002] Cellulose acetate fiber has been the main material used for cigarette filters. Although tobacco fiber is known to be a biodegradable material, it is made of cellulose acetate. The filter will remain intact for one to two years after being buried in the soil. It takes a considerable amount of time for it to be completely biodegraded. After being used for smoking, it is collected as garbage. This includes tobacco products that are embedded in tobacco products, as well as tobacco products that are left abandoned in the living environment. Considering the amount of tobacco products and their toxicity, it is possible to further improve the biodegradability of cigarette filters. It is necessary to

[0003] In addition, tobacco is a luxury item that is enjoyed by inhaling the smoke that is produced when it burns. The more uniform the smoke density, the better the quality of the cigarette is evaluated. One of the items that can be evaluated in relation to the performance is the suction resistance of the filter. It is known that the rate of filtration tends to increase proportionally with the increase in the filtering efficiency of the filter. In other words, cigarette filters with excellent resistance to drawing not only have excellent filtering performance against harmful substances, but also Rather, it can be said that it provides excellent user satisfaction (quality).

[0004] Therefore, while replacing the conventional cellulose acetate material, it has the same properties as the filter material, such as suction resistance. It is necessary to develop filter materials that can achieve the same or higher level of performance compared to conventional technologies. is. Summary of the Invention [Problem to be solved by the invention]

[0005] One objective of this application is to develop a novel cellulose acetate filter that can replace commercially available cellulose acetate for cigarette filters. To provide a lyocell material.

[0006] Another object of the present application is to provide a tamper-evident product that is environmentally friendly in its manufacturing process and highly biodegradable when disposed of. To provide a Lyocell material for a bacofilter.

[0007] A further object of the present application is to provide a method for manufacturing a predetermined shape so as to satisfy the irregularity degree and width ratio described below. The object of the present invention is to provide a modified cross-section lyocell material having a modified cross-section.

[0008] Yet another object of the present application is to provide a method for producing a cigarette filter material that satisfies the characteristics (e.g., resistance to drawing) of the material. The object of the present invention is to provide a lyocell material for cigarette filters that can add or improve the properties of the filter.

[0009] Yet another object of the present application is to provide a lyocell filter for cigarettes.

[0010] It is yet another object of the present application to provide a cigarette comprising a lyocell filter.

[0011] A further object of the present application is to provide a method for the production of said lyocell material, filters and cigarettes. The goal is to improve processability.

[0012] The above and other objects of the present application are achieved by the present invention, which is described in detail below. So both can be solved. [Means for solving the problem]

[0013] According to a specific example of the present application, a cross section having a predetermined shape (for example, a degree of deformation and a width ratio as described later) is provided. (satisfying) modified cross-section lyocell material, cigarette filter containing same, and manufacturing method thereof Provided.

[0014] Specifically, the inventors of the present application have developed a method for manufacturing a fiber having a predetermined shape, fineness, and The reason is that the modified cross-section yarn that satisfies the above provides a higher specific surface area than the circular cross-section yarn. It was confirmed that this could provide excellent filtering functions (e.g., suction resistance), and as described below The present invention relates to a lyocell material having the above-mentioned structure, a cigarette filter containing the same, and a method for manufacturing the same. This led to the following.

[0015] In the following, the present application relates to a lyocell material, a cigarette filter containing the same, and a method for manufacturing the same. The manufacturing method thereof will be explained in more detail below.

[0016] In one example related to the present application, the present application provides a modified cross-section lyo that satisfies a predetermined shape and fineness. The present invention relates to a method for manufacturing a lyocell material. The lyocell material is used to manufacture cigarette filters. It can be used to

[0017] Specifically, the method utilizes a profile-forming spinneret having at least three projections. and spinning the lyocell dope. The spun lyocell dope is solidified to form a lyocell dope. Obtaining a multifilament and treating the lyocell multifilament with an oil agent and steam and pressure are applied to the lyocell multifilament. The oil-treated lyocell multifilament is placed in a crimp machine. and a crimping step of inserting the lyocell multi-layer fabric. Filaments (e.g., oil-treated lyocell multifilaments) have a total fiber count of 15, 1,000 to 45,000 denier, and the lyocell multifilament The filaments have a single yarn fineness of 1.5 to 8.0 denier.

[0018] The lyocell material produced by the above method can have a contoured cross section. The cross section may refer to a shape that is not circular but includes a number of protrusions. For example, as shown in Figure 1, multiple protrusions (e.g., three or more protrusions) extend from the center. A cross section of such a shape can be called an irregular cross section.

[0019] In one example, the modified cross-section lyocell material of the present application has protrusions branching out from a central portion. For example, the modified cross-section lyocell material may have four, five, or more The irregularly shaped protrusions may have cross-sectional shapes extending in different directions from the center.

[0020] Although not particularly limited, if there are three projections, the projections must have a Y-shaped cross section. If there are four projections, the cross section may be cruciform.

[0021] In an embodiment of the present application, the modified cross section of the lyocell material produced by the above-mentioned method is Satisfy the specified irregularity and width ratio.

[0022] Specifically, each protrusion extending from the center is related to its shape and is determined by the following relational expression 1. The deformation degree calculated by the following formula 2 is 0.6 or more, and the width ratio calculated by the following formula 2 is However, it is between 0.5 and 2.0.

[0023] [Equation 1] Irregularity=L / W

[0024] [Equation 2] Width ratio = W1 / W2

[0025] L is related to the degree of irregularity and is the length of the protrusion extending from the center or the direction in which the protrusion branches. Specifically, L means the length of the protrusion, The two points where any one protrusion meets the two protrusions directly adjacent to it are connected. From the center of the line corresponding to the width of the connected protrusion to the end point of the protrusion (for which the length is to be calculated) The distance (e.g., the longest distance or length) can be calculated.

[0026] In relation to the irregularity, W means the width (or width) of the protrusion. When the length L of the protrusion defined as above is used as the reference line (i.e., in Figure 1, L is used as the reference line), When the reference line length is 10%, W is the protrusion width W1 at the point corresponding to 10% of the reference line length. The arithmetic mean value (W = (W1 + W2) / 2) of the protrusion width W2 at the point corresponding to 90% of the When calculating the length of the widths W, W1, and W2 of the protrusions, The straight line for determining the length is also perpendicular to the projection length L.

[0027] In one example, the length and width of the projection for calculating the deformation degree are For each protrusion on the irregular cross section, calculate the length and width, then divide by the number of protrusions. It is also the arithmetic mean value calculated.

[0028] In the specific example of the present application, L is greater than W.

[0029] When the tow having the above-described irregular cross section is applied to a cigarette filter, the filter characteristics (e.g., suction resistance, filter circumference) can be realized uniformly.

[0030] In one example, the deformation degree of the modified cross-section Lyocell material calculated as described above (relationship 1) is 0.7 or more, 0.8 or more, 0.9 or more, 1.0 or more, 1.1 or more, 1.2 or more, 1.3 or higher, 1.4 or higher, 1.5 or higher, 1.6 or higher, 1.7 or higher, 1.8 or higher, 1.9 or higher Above, 2.0 or above, 2.1 or above, 2.2 or above, 2.3 or above, 2.4 or above, or 2.5 or above The upper limit is, for example, 4.0 or less, 3.5 or less, specifically, 3.0 or less. Below, 2.9 or less, 2.8 or less, 2.7 or less, 2.6 or less, 2.5 or less, 2.4 or less, 2. It can also be 3 or less, 2.2 or less, 2.1 or less, or 2.0 or less.

[0031] In one example, the width ratio of the lyocell material calculated as above (Equation 2) is: 0.6 or more, 0.7 or more, 0.8 or more, 0.9 or more, 1.0 or more, 1.1 or more, 1.2 or more above, 1.3 or above, 1.4 or above, 1.5 or above, 1.6 or above, 1.7 or above, or 1.8 or above The upper limits are 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, and 1.5 It can be 1.4 or less, 1.3 or less, 1.2 or less, or 1.1 or less.

[0032] The modified cross-section fiber satisfying the above-mentioned degree of modification and width ratio is a circular cross-section fiber or the above-mentioned modified cross-section fiber. The surface area is increased compared to when using modified cross-section fibers that cannot satisfy the thickness and width ratio. This can increase the size of the filter and improve the tobacco smoke removal performance.

[0033] In addition, when the above-mentioned irregularity (relationship 1) and width ratio (relationship 2) are smaller than the above-mentioned values, The specific surface area gradually converges to a circular cross-sectional area, ensuring sufficient specific surface area. In addition, the above-mentioned irregularity (relationship 1) value and width ratio (relationship 2) value cannot be obtained. If the above values ​​are exceeded, the same or similar amounts ( Example: When manufacturing a filter using the filament of g), even if it is filled, the wide cross section characteristic of the irregular cross section Since the effect of providing a large specific surface area is reduced, it is difficult to achieve the desired filter properties (e.g., suction resistance).

[0034] The method for producing a lyocell material according to the present application will be described in detail below. .

[0035] (a) Lyocell dope spinning stage This step uses a profile-forming spinneret having at least three projections to spin lyocell. This is the step of spinning the spinning dope. The spinning dope is a lyocell dope, i.e., a cellulose dope. cellulose (or cellulose pulp) and N-methylmorpholine-N-oxide (NMMO :N-methylmorpholine-N-oxide).

[0036] The type or design of the spinneret that can form a modified cross section having at least three projections is For example, a nozzle having a shape corresponding to three or more protrusions may be used. Alternatively, at least three holes can be used to form three or more protrusions. Alternatively, a spinning device having a plurality of unit holes formed adjacent to each other may be used.

[0037] Commercially available cellulose acetate filters are pointed out as the main cause of microplastic generation However, the amine oxide solvents used in the production of lyocell fibers are Lyocell material is recycled during its production process so that it can be reused and is biodegradable upon disposal. Furthermore, lyocell tow does not generate any pollutants in a relatively short time. Lyocell is more environmentally friendly than cellulose acetate because it is biodegradable and easily removed. It is a material.

[0038] In one embodiment, the cellulose content of the spinning dope is 1% by weight of the total dope. It is 5 to 15% by weight based on 00% by weight. If the cellulose content is too low, If the content exceeds the above range, it is difficult to realize the properties of lyocell fiber. In consideration of this, the cellulose content in the spinning dope is 6% by weight or more, It may be 7% by weight or more, 8% by weight or more, 9% by weight or more, or 10% by weight or more, and the upper limit is 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 less by weight or even 9% or less by weight.

[0039] In one example, the spin dope contains N-methylmorpholine-N-oxide (NM The aqueous solution may be selected based on the degree of cellulose dissolution, the process temperature, etc. For example, N-methylmorpholine-N-oxide (NMMO) 80 to 95 It also contains 5 to 20 weight parts of water.

[0040] In one embodiment, the cellulose or cellulose pulp is made of 10% cellulose. The α-cellulose content is 85 to 97% by weight, compared to 0% by weight.

[0041] In a specific example of the present application, the degree of polymerization (DPw) of the cellulose is 600 to It's also 1,700.

[0042] The nozzle temperature of the spinneret, specifically the spinning temperature, can be appropriately selected by those skilled in the art. The viscosity of the spinning dope varies depending on the spinning temperature, and the extrusion may not be good. In consideration of this, the spinning temperature is, for example, 100°C to 120°C, or less than 100°C. This can be done at a temperature of 110°C.

[0043] In one embodiment, the spinning step is carried out using the monofilament and / or multifilament spinning method described above. The spinning can be carried out under controlled spinning conditions so as to satisfy the fineness of the filaments. For example, in the step of spinning the spinning dope, the single filament fineness of the filament is 1.5 to 8.0. The spinning can be carried out under controlled spinning conditions so that the denier is also the same. One or more spinning conditions selected from the discharge amount and spinning speed are appropriately controlled, The single yarn fineness of the filament forming the fiber material is in the range of 1.5 to 8.0 denier. In this case, the single filament fineness is the fineness of the filament separated from the multifilament. It also means the fineness of a single monofilament. By adjusting the number of fibers, the total fineness can be controlled within a predetermined range.

[0044] Specifically, the single yarn fineness of the filament is, for example, 7.5 denier or less, 7.0 denier or less. Denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier The lower limit is, for example, 2.0 denier or less or 4.5 denier or less. Denier or more, 2.5 denier or more, 3.0 denier or more, 3.5 denier or more, 4.0 denier denier or more, 5.0 denier or more, 5.5 denier or more, or 6.0 denier or more Satisfying the above range will ensure stable drawing resistance of the cigarette filter and ensure processability. It is also advantageous in that

[0045] The spinning dope discharged through the spinneret undergoes a coagulation stage, which will be described later.

[0046] (b) Coagulation step and obtaining multifilaments In this step, the spun lyocell spinning dope is solidified and the lyocell multifilament is obtained. You gain Lament.

[0047] The coagulation may be carried out by contacting the spinning dope with air and / or a coagulation liquid. .

[0048] In one example, the coagulation is performed by supplying cooling air to the spun lyocell dope. a secondary coagulation step in which the primarily coagulated spinning dope is introduced into a coagulation liquid and coagulated; , which may also include.

[0049] By the above-mentioned coagulation method, the lyocell dope discharged from the spinneret is The primary solidification can occur in the space (air gap section) between the solidification bath and the solidification tank. In the gap section, for example, the air cooling section located inside the nozzle is Cooling air can be supplied. Alternatively, so-called air quenching, as known in the art, can be used. The primary solidification can be carried out by the following methods or means.

[0050] In one example, the upper limit of the temperature of the cooling air used for the primary solidification is, for example, 15°C or less. Specifically, the cooling air is 14°C or less, 13°C or less, 12°C or less, 11°C or less. If the temperature exceeds the above range, the spinning process using air may be The loop coagulation is not sufficient, and the spinning process is not good.

[0051] The lower limit of the cooling air is determined in consideration of the spinning process and / or the cross-sectional uniformity of the filaments. For example, if the temperature of the cooling air is less than 4°C, the surface of the nozzle The surface of the filament becomes uneven and the spinning process becomes difficult. When the cooling air is cooled, the temperature may be 5°C or higher, 6°C or higher, 7°C or higher, 8°C or higher, or 9°C or higher. be.

[0052] The amount of cooling air supplied is determined based on the requirements for sufficient coagulation, spinning processability, and physical properties of the filaments. For example, the spinning dope may contain 70 to 300 Nm 3 More specifically, the air volume is 100 Nm 3 / h or more or 150Nm 3 / h or more, and the upper limit of the air volume is, for example, 250Nm 3 / h or less or 200Nm 3 / h or less.

[0053] After the primary solidification as described above, the cooled spinning dope is transferred to a coagulation tank or The temperature of the coagulation liquid can be adjusted to the appropriate temperature for the coagulation process. The temperature of the coagulation liquid is, for example, 30°C or less or 25°C or less. ℃ or more, 15℃ or more, or 20℃ or more. When the temperature is maintained at the above temperature, the solidification rate is appropriate. can be maintained properly.

[0054] The type of coagulation liquid for the secondary coagulation as described above is not particularly limited. For example, The coagulation liquid is at least one of water and N-methylmorpholine-N-oxide (NMMO). It also includes.

[0055] Although not particularly limited, the coagulation liquid may be a mixture of water and N-methylmorpholine-N-oxide. When (NMMO) is included, the water content in the coagulation liquid is 60 to 90 wt. %; The content of N-methylmorpholine-N-oxide (NMMO) is 10 to 40% by weight. Alternatively, the coagulation liquid may be 70 to 80% by weight of water and 20 to 30% by weight of Some contain N-methylmorpholine-N-oxide (NMMO). The concentration of the solution can be controlled to be maintained throughout the manufacturing process using a sensor light.

[0056] (c) Water washing stage If necessary, after the coagulation step and the multifilament step, Such washing can remove any N-methyl group remaining in the filaments. methylmorpholine-N-oxide (NMMO) and / or other impurities are removed. Ugh.

[0057] The method of washing with water is not particularly limited. For example, a pulling roller is used to wash the The solidified lyocell multifilament is introduced into the washing tank, so that it can be washed. Or, in the process of moving to the next stage by the pulling roller, the washing liquid is sprayed. It may be washed with water in the same manner as described above.

[0058] The components of the washing liquid are not particularly limited. For example, the washing liquid may contain water. It may further contain other known additives.

[0059] In addition, in consideration of reuse after washing, the temperature of the washing water is adjusted to 100°C or less. It can be used as such.

[0060] (d) Oil treatment stage This step reduces friction on the filaments and improves the crimping step described below. and applying an oil to the surface of the filament so that the crimp can be formed well. is.

[0061] Although there is no particular limitation, the oil treatment is carried out by completely immersing the multifilament in the oil. This is done by immersing the multifilament in a bath filled with oil. Or, in the process of moving to the next stage by the pulling roller, the oil solution is sprayed. The oil treatment may be carried out by the following method.

[0062] After the oil treatment as described above, the amount of oil applied to the multifilament becomes constant. In this way, rolls positioned before and / or after the oil treatment step may be used to An additional step may be performed to squeeze out the oil from the surface.

[0063] In one example, the oil treatment is carried out on 100 weight percent of the oil-treated multifilament. %, the content of the oil may be about 5% by weight or less. The amount of oil in the treated multifilament is 4% by weight or less, 3% by weight or less, or It may be 2% by weight or less, and may be 0.5% by weight or more, 1% by weight or more, or 2% by weight or more. be.

[0064] The type of oil that can be used is not particularly limited, and any known oil known in the related technical field can be used. It can be done.

[0065] Optionally, after the oil treatment as described above, the oil may be dried.

[0066] In an embodiment of the present application, one or more of the aforementioned steps may be performed by using the aforementioned monofilament. The process is carried out under controlled conditions to satisfy the fineness of the yarn and / or multifilament. In this case, the single filament fineness is the fineness of the single filament separated from the multifilament. This refers to the fineness of the monofilament.

[0067] Specifically, the single yarn fineness of the filament is, for example, 7.5 denier or less, 7.0 denier or less. Denier or less, 6.5 denier or less, 6.0 denier or less, 5.5 denier or less, 5.0 denier Denier or less, 4.5 denier or less, 4.0 denier or less, 3.5 denier or less or 3. The lower limit is, for example, 2.0 denier or more, 2.5 denier or less. denier or more, 3.0 denier or more, 3.5 denier or more, or 4.0 denier or more As will be confirmed in the comparative examples described later, the single filament fineness is within the above range. If dislodged, the resistance to draw of the cigarette filter can be significantly reduced.

[0068] Although not particularly limited, the step of controlling the fineness range as described above is as follows: Alternatively, the spinning step may be carried out in such a manner that the single yarn fineness range can be secured. The threading, coagulation, washing and oiling steps can all be controlled.

[0069] (e) Crimping step The crimping step involves applying steam and pressure to the oil-treated lyocell multifilament. This is the stage where the crimped tow is obtained. This step may be referred to as the crimping step.

[0070] Through crimping, waves are given to the multifilament, and the fibers are made bulky. The crimping may have a stuffer box and / or This may also be accomplished using a crimping device known to include a steam box. The crimping device that can be used is, for example, a device that applies steam pressure and roll pressure, which will be described later. There are no particular limitations on the device as long as it can be used.

[0071] In one embodiment, the crimping step is performed by first crimping the lyocell multifilament. The team is supplied, the multifilament is preheated and swollen, and then the multifilament is This can be achieved by pressing the multifilament with a press roller to form wrinkles in the multifilament. At this time, a steam box is used to supply steam. The screw may be located at the front end of the crimping device.

[0072] In one example, the crimping step is performed by pressing the multifilament with a press roller. This can be accomplished by simultaneously applying pressure and steam.

[0073] In one embodiment, the crimping step is performed by first crimping the lyocell multifilament. The multifilament is preheated and swollen by the pressure roller. This can be accomplished by simultaneously pressing the multifilament and steaming it.

[0074] In one example, the crimping step is performed by a crimping device (specifically, a press - Before feeding, the multifilament was fed with 0.1 to 2.0 kgf / cm 2 of This can be accomplished by adding steam. In the specific example of the present application, 2 That's all, 0.3kgf / cm 2 Over 0.4kgf / cm 2 More than 0.5kgf / cm 2 The above is 0.6kgf / cm 2 The steam above can be provided by a steam box. 1.5kgf / cm 2 Below, 1.4kgf / cm 2 Below, 1.3kgf / cm 2 below , 1.2kgf / cm 2 Below, 1.1kgf / cm 2 or less than 1.0kgf / cm 2 Below If the steam supply amount or pressure is below the above range, If the temperature exceeds the above range, the crimp will not be formed smoothly. The flexibility of the liner is increased, preventing excessive crimping of the filament in the crimping device. The wire is applied to the crimping device and cannot pass through it.

[0075] In one example, the crimping step uses rollers to feed the material into a crimping device. 1.5 to 4.0 kgf / cm 2 carried out under the pressure of In the specific example of the present application, 1.6 kgf / cm 2 More than 1.7kgf / cm 2 Below Top, 1.8kgf / cm 2 Over 1.9kgf / cm 2 Over 2.0kgf / cm 2 End , 2.1kgf / cm 2Above, 2.2kgf / cm 2 Above, 2.3kgf / cm 2 That's all, 2.4kgf / cm 2 or more than 2.5kgf / cm 2 The pressure above the pressure of the press roller (pr It can be added to the multifilament through a roller. 2 Below, 3.8kgf / cm 2 Below, 3.7kgf / cm 2 Below, 3.6kgf / cm 2 Below Bottom, 3.5kgf / cm 2 Below, 3.4kgf / cm 2 Below, 3.3kgf / cm2 or less , 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 or less than 2.5kgf / cm 2 The following pressures can be applied: Roller If the pressure is below this range, the desired number of crimps will not be formed. If the roller pressure exceeds the above range, the pushing force is too strong and the filament It cannot be smoothly fed into the crimping device or passed through the stuffer box. The press roller that applies the pressure causes the multifilament to wrinkle. can be formed.

[0076] In one example, the crimping step includes applying a predetermined pressure to the multifilament. A doctor blade can be applied. The residence time of the filament fed into the paste stuffer box is adjusted to This contributes to the number of crimps (which affects the filter performance). The card is pressed by the roller, for example, and then discharged at the roller pressure point. It may be located in the path of multifilament migration.

[0077] In a specific example of the present application, the crimping step utilizes a doctor blade to apply the crimp. The multifilament passed through the rollers of the pump device is subjected to a pressure of 0.1 to 2.0 kgf / cm 2 The doctor blade is pressed by the roller. After that, the roller pressure point can be located in the path of movement of the discharged multifilament. In the specific example of the application, the pressure applied by the doctor blade is 0.2 kgf / cm m 2 More than 0.3kgf / cm 2 Over 0.4kgf / cm 2 or more than 0.5kgf / cm 2 The upper limit of the pressure is, for example, 1.5 kgf / cm. 2 Below, 1 .4kgf / cm 2 Below, 1.3kgf / cm 2 Below, 1.2kgf / cm 2 Below, 1. 1kgf / cm 2 or less than 1.0kgf / cm 2 Also the following:

[0078] In one example, the crimping step is performed at a temperature ranging from 120°C to 250°C. If the temperature is too low, the shape stability effect of the crimp is not good, and if the temperature is too high, If the temperature is high, the concentration of the retaining agent will be high in the stuffer box, and the crimping Therefore, taking into consideration the steam pressure mentioned above, it is recommended to use a temperature of 130°C or higher and 14 Above 0℃ or above 150℃, and below 200℃, below 180℃ or below 160℃ The temperature can be appropriately controlled within this range.

[0079] In one example, the crimping step is performed by crimping the wire into a crimped shape represented by the following equation 1: The raft ratio can be satisfied. The pressure exerted is also due to the rollers.

[0080] [Formula 1] 1.01≦crimp draft ratio≦1.30

[0081] In the above formula 1, the crimp draft ratio is calculated by V1 / V0, where V0 is The transfer of the oil-treated multifilament before it is fed into the crimping device. V1 means the moving speed of the filament gripped by the rollers in the crimping device. In this case, the passing speed refers to the speed at which the material is fed into the crimping stage. (or fed into a crimping device), the multifilament is subjected to the steam process and It can refer to the speed at which the material moves between the press rollers and / or the press rollers.

[0082] A process carried out under the conditions described above can impart a uniform crimp to the tow. For example, As confirmed by the experiment described below, the toner of the embodiment manufactured under the condition that satisfies the formula 1 is The upper and lower limits of the range of the number of crimps in the tow calculated by the arithmetic average are closer than those of the comparative example. It is confirmed that the tow is in contact with the wire (i.e., the uniformity of the tow is ensured). The uniformly formed crimped tow manufactured under these conditions is then used to make cigarette filters. This allows for a high level of fiber or fiber streak alignment, as will be described later. It can provide resistance to suction.

[0083] In addition, the method performed under the condition of satisfying the above formula 1 can produce a good crimp shape, It is also advantageous in imparting a degree of irregularity and width ratio to the tow. A crimped toe having a width ratio that satisfies the above-mentioned range functions advantageously to improve the resistance to attraction. do.

[0084] On the other hand, if the range of the formula 1 cannot be satisfied, the tow production conditions are not appropriate. , tow cannot be produced, or even if tow can be produced, The crimped shape is poor and the tow is uneven, which makes it difficult to manufacture cigarette filters. As a result, it is difficult to provide a filter with excellent suction resistance.

[0085] (f) Other stages After crimping, any appropriate post-processing can be performed.

[0086] In one example, a secondary oil treatment (g) may be additionally performed. This secondary oil treatment can prevent static electricity from being generated in the tow and can impart flexibility to the tow. This step may be the same as or similar to the oil treatment step (d) above.

[0087] In one example, a drying treatment (h) may be additionally performed. The drying may be, for example, The drying process can be carried out at a temperature ranging from 00°C to 130°C. For example, hot air may be applied to the tow or The tow is left in or passed through a temperature-controlled room for a certain period of time. It can also be done through methods.

[0088] According to an embodiment of the present application, a method including the crimping step as described above can be used to make a crimped piece of inch ( Tows having 20 to 50 crimps per inch can be provided. For example, The number of crimps is 25 ea / inch or more, 30 ea / inch or more, or 35 ea / inch or more , 40 ea / inch or more or 45 ea / inch or more, and the upper limit is, for example, 45e a / inch or less, 40ea / inch or less, 35ea / inch or less, 30ea / inch or less or 2 The number of crimps and their uniformity are determined by the crimping stage, e.g. For example, it can be adjusted through the crimp draft ratio, etc. The crimped tow not only has the number of crimps as described above, but also has the crimps as described above. Since the limp is uniformly formed, when it is manufactured into a cigarette filter, as described below, The present invention can provide a high level of resistance to draw.

[0089] According to the present application, a lyocell material ( For example, a crimped tow having a total fiber size of 15,000 to 45,000 decimeters can be provided. For example, the lower limit of the total fineness is 16,000 or more, 17,000 or more, 18,000 or more, 19,000 or more, or 20,000 or more The upper limit is, for example, 40,000 or less, 35,000 or less, 30,000 or less. If the total fineness is outside the above range, a sufficient amount The filaments cannot be packed into the filter paper, and the filter properties (e.g., suction resistance) are deteriorated. Alternatively, if the total fineness of the tow is outside the above range, the tow packed in the filter wrapping paper may The amount of water that flows through the filter becomes too great, causing the filter paper to tear or the required suction resistance of the filter to be lost. It can be difficult to adjust the tow loading to achieve the required resistance.

[0090] In a specific example of the present application, the fineness of the lyocell multifilament is Depending on the size, it can be controlled to an appropriate value.

[0091] For example, the lyocell material may be used in (ultra) slim filters (e.g., filter rods) When the lyocell multifilament is used for The total fineness is also in the range of 15,000 to 25,000 denier. The total fineness of the Lyocell multifilament used in the filter is 16,000 denier. 17,000 denier or more, 18,000 denier or more, 19,000 denier or more Over 20,000 denier, over 21,000 denier, under 22,000 denier Above, 23,000 denier or more or 24,000 denier or more, and 24, 000 denier or less, 23,000 denier or less, 22,000 denier or less, 21,0 00 denier or less, 20,000 denier or less, 19,000 denier or less, 18,00 It may be 0 denier or less, 17,000 denier or less, or 16,000 denier or less. In such cases, the single yarn size of the lyocell monofilament must be 4.5 denier or more. For example, 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier It may be 7.0 denier or more, 7.0 denier or more, or 7.5 denier or more.

[0092] In another embodiment, the lyocell material is a regular filter (e.g., a filter). When used in a filter rod having a circumference of 19 mm or more, the Lyocell multifilament The total fineness of the filaments is also in the range of 25,000 to 45,000 denier. The total fineness of the Lyocell multifilament used in the regular type filter is 26 ,000 or more, 27,000 or more, 28,000 or more, 29,000 or more, 30,000 Over 31,000, Over 32,000, Over 33,000, Over 34,000, 3 Over 5,000, Over 36,000, Over 37,000, Over 38,000, Over 39,00 0 or more, 40,000 or more, 41,000 or more, 42,000 or more, 43,000 or more or over 44,000, and also under 44,000, under 43,000, and under 42, 000 or less, 41,000 or less, 40,000 or less, 39,000 or less, 38,000 or less Below, 37,000 or less, 36,000 or less, 35,000 or less, 34,000 or less, 33 ,000 or less, 32,000 or less, 31,000 or less, 30,000 or less, 29,000 It can also be 28,000 or less, 27,000 or less, or 26,000 or less. In such cases, the single yarn size of the lyocell monofilament is 5.0 denier or less, e.g. , 4.5 denier or less, 4.0 denier or less, 3.5 denier or less, 3.0 denier or less , 2.5 denier or less, or 2.0 denier or less.

[0093] As mentioned above, the present application is directed to the total fineness in the above range, specifically, regular filters and ( We provide Lyocell materials with fineness that can ensure a wide range of filter performance suitable for ultra-slim filters. The total fineness of the tow can be determined by the single filament fineness and the number of crimps. However, in the method of the present application, as mentioned above, the single yarn fineness and the number of crimps are controlled, and therefore This ensures that the total fineness of the tow is suitable for producing cigarette filters and ensuring their functionality. .

[0094] In another embodiment, the present application relates to a modified cross-section lyocell material. The modified cross section lyocell material can be, for example, a material produced by the above-mentioned method for producing a modified cross section lyocell material. Specifically, the fiber can be produced by the above-mentioned spinning, coagulation, water washing, oil treatment and crimping. It is also manufactured through the above stages.

[0095] Specifically, the modified cross section lyocell material is made by crimping lyocell multifilaments. The lyocell multifilament is also a crimped tow manufactured by the above method. , including monofilaments with modified cross sections, but the total fineness is 15,000 to 45, 000 denier, and a single monofilament yarn constituting the lyocell multifilament The fineness satisfies 1.5 to 8.0 denier.

[0096] The modified cross section of the monofilament has at least three projections, may have a degree of deformation of 0.6 or more and a width ratio of 0.5 to 2.0. The specific values ​​are as described above. As described above, the irregularity and width ratio The relevant calculations can be done as follows:

[0097] [Equation 1] Irregularity=L / W

[0098] [Equation 2] Width ratio = W1 / W2

[0099] In the above-mentioned relations 1 and 2, L means the length of the protrusion, and any one of Within the line connecting the two points where a protrusion meets the two protrusions directly adjacent to it It is calculated by the distance from the center to the end point of the protrusion, and W means the width of the protrusion. The protrusion width W1 at a point corresponding to 10% of the length L and the protrusion width W2 at a point corresponding to 90% of the length L are The arithmetic mean of the width W2 of the protrusion at the point where the protrusion is located is calculated. It is.

[0100] In one example, the lyocell material satisfies at least the following formula 1: It is also manufactured through

[0101] Specifically, the lyocell material has a crimp draft expressed by the following formula 1: The material is fed into the crimping device so that the crimp can be applied under the condition that the ratio is satisfied. It may be of or include manufactured crimped tow.

[0102] [Formula 1] 1.01≦crimp draft ratio≦1.30

[0103] In the above formula 1, the crimp draft ratio is calculated by V1 / V0. , V0 is the moving speed of the multifilament before it is fed into the crimping device; V1 means the threading of the filament gripped by the rollers in the crimping device. It means overspeed.

[0104] In one example, the tow has 20 to 50 crimps per inch. The specific values ​​are as described above.

[0105] In one embodiment, the tow, i.e., a crimped lyocell multifilament The total fineness of the yarn is 15,000 to 45,000 denier. The cell multifilament has a total fineness of 15,000 to 25,000 denier. Or, it may be 25,000 or 45,000 denier. As stated above.

[0106] In one example, the lyocell multifilament is a monofilament single yarn. The fineness is 1.5 to 8.0 denier. The specific values ​​are as described above.

[0107] As mentioned above, in a specific example of the present application, the lyocell multifilament The fineness can be controlled to an appropriate value depending on the circumferential size of the filter.

[0108] For example, the lyocell material may be used in (ultra) slim filters (e.g., filters with a circumference of 100 mm). , 19 mm or less), the total fineness of the lyocell multifilament is , and the denier range is 15,000 to 25,000. The total fineness of the lyocell multifilament used in the Luta is over 16,000 denier. 17,000 denier or more, 18,000 denier or more, 19,000 denier or more, 2 20,000 denier or more, 21,000 denier or more, 22,000 denier or more, 23 ,000 denier or more or 24,000 denier or more, and Denier or less, 23,000 denier or less, 22,000 denier or less, 21,000 denier or less 20,000 denier or less, 19,000 denier or less, 18,000 denier or less 17,000 denier or less, or 16,000 denier or less. In such cases, the single yarn size of the lyocell monofilament is 4.5 denier or more, e.g. , 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier or more , 7.0 denier or more or 7.5 denier or more.

[0109] In another embodiment, the lyocell material is a regular filter (e.g., a filter rod). When the lyocell multifilament is used for The total fineness is also in the range of 25,000 to 45,000 denier. The total fineness of the Lyocell multifilament used in the lar-type filter is 26,000 or more. , 27,000 or more, 28,000 or more, 29,000 or more, 30,000 or more, 31, 000 or more, 32,000 or more, 33,000 or more, 34,000 or more, 35,000 or more Above, 36,000 or more, 37,000 or more, 38,000 or more, 39,000 or more, 40 ,000 or more, 41,000 or more, 42,000 or more, 43,000 or more or 44,0 00 or more, and 44,000 or less, 43,000 or less, 42,000 or less, 41,000 or less, 40,000 or less, 39,000 or less, 38,000 or less, 37,0 00 or less, 36,000 or less, 35,000 or less, 34,000 or less, 33,000 or less , 32,000 or less, 31,000 or less, 30,000 or less, 29,000 or less, 28, 000 or less, 27,000 or less, or 26,000 or less. In this case, the single yarn fineness of the lyocell monofilament is 5.0 denier or less, for example, 4.5 denier. Denier or less, 4.0 denier or less, 3.5 denier or less, 3.0 denier or less, 2.5 denier It is also 2.0 denier or less.

[0110] Thus, according to the present application, filters suitable for regular filters and ultra slim filters are available. It is possible to provide a lyocell material with a controlled total fineness so that a wide range of filtering performance can be ensured.

[0111] Further details regarding the lyocell material are provided in connection with the method for manufacturing the lyocell material. Since the parts are identical, we will omit them.

[0112] In yet another embodiment, the present application relates to a method for manufacturing a cigarette filter. The aforementioned method includes any of the aforementioned methods for producing a modified cross-section lyocell material. It is also a way to

[0113] Specifically, the method uses a modified cross-section forming spinneret having at least three projections. and coagulating the spun lyocell dope to form a lyocell dope. obtaining a lyocell multifilament; and treating the lyocell multifilament with an oil agent. and applying steam and pressure to the lyocell multifilament. a crimping step of feeding the treated lyocell multifilament into a crimping device; and manufacturing a filter using the limp tow.

[0114] And, the manufacturing method of the cigarette filter (specifically, the manufacturing process of the lyocell material) In one or more of the steps, the total fineness of the lyocell multifilament is 15,00 0 to 45,000 denier, and the monofilament constituting the lyocell multifilament Under controlled conditions so that the single filament size of the lament is 1.5 to 8.0 denier It can be carried out.

[0115] Among the steps involved in the manufacturing process of cigarette filters, those described above for Lyocell materials The overlapping stages are omitted here because their contents are identical.

[0116] In connection with the above-mentioned method, the modified cross-section Lyocell material used in the filter manufacturing stage is Lyocell It is also a crimped tow produced by crimping a multifilament. The lyocell multifilament includes monofilaments having a modified cross section, The cell multifilament has a total fineness of 15,000 to 45,000 denier. The single yarn fineness of the monofilament constituting the lyocell multifilament is 1.5 to The modified cross section has at least three projections, and the projections are 8.0 denier. The ridges may have a degree of deformation of 0.6 or more and a width ratio of 0.5 to 2.0. The specific values ​​are as described above. As described above, the irregularity and width ratio The calculation for can be done as follows:

[0117] [Equation 1] Irregularity=L / W

[0118] [Equation 2] Width ratio = W1 / W2

[0119] In the above-mentioned relations 1 and 2, L means the length of the protrusion, and any one of Within the line connecting the two points where a protrusion meets the two protrusions directly adjacent to it It is calculated by the distance from the center to the end point of the protrusion, and W means the width of the protrusion. The protrusion width W1 at a point corresponding to 10% of the length L and the protrusion width W2 at a point corresponding to 90% of the length L are The arithmetic mean of the width W2 of the protrusion at the point where the protrusion is located is calculated. It is.

[0120] In one example, the crimping step is performed by applying a crimping force as expressed in Equation 1 below: This can be accomplished to satisfy the pump draft ratio.

[0121] [Formula 1] 1.01≦crimp draft ratio≦1.30

[0122] In the above formula 1, the crimp draft ratio is calculated by V1 / V0, where V0 is The transfer of the oil-treated multifilament before it is fed into the crimping device. V1 means the moving speed of the filament gripped by the rollers in the crimping device. This means the speed at which the vehicle passes through.

[0123] In one example, the tow has 20 to 50 crimps per inch. The specific explanation is the same as that described above, so it will be omitted here.

[0124] The steps of fabricating the filter, which are performed after the crimping step, are carried out by known methods. For example, a tow-filled wrapping paper (such as a wrapping paper, a filter paper, or a This method involves forming a rod shape using a filter (which can be called a filter wrapping paper). Alternatively, a filter paper filled with rod-shaped tow can be manufactured by using a suitable The filters can be manufactured by cutting to length.

[0125] The wrapping paper is made of the above-mentioned lyocell tow (i.e., at least oil-treated and crimped). A porous paper that can encase the filter (a given tow) and maintain the filter shape (e.g., a cylinder or a tube). Or it may be a non-porous paper.

[0126] In one example, when a porous wrapper is used, the wrapper has a porosity of 10 to 50.0 Specifically, the lower limit of the porosity of the wrapper paper is For example, over 1,000 CU, over 5,000 CU, over 10,000 CU, over 15,000 0CU or more, 20,000CU or more, 25,000CU or more, 30,000CU or more, 3 is 5,000 CU or more, 40,000 CU or more, or 45,000 CU or more; and The upper limit is, for example, 45,000 CU or less, 40,000 CU or less, 35,000 CU or less. Below, 30,000CU or less, 25,000CU or less, 20,000CU or less, 15,0 00CU or less, 10,000CU or less or 5,000CU or less.

[0127] In an embodiment of the present application, the cigarette filter may have a predetermined shape and size.

[0128] For example, the filter may have a rod shape. The filter may have a cylindrical shape.

[0129] The filter may have a length of, for example, 10 to 150 mm. The length of the filter may be set to a lower limit of 20 mm or more, 30 mm or more, 40 mm or more, 50 mm or more, or mm or more, 60mm or more, 70mm or more, 80mm or more, 90mm or more, 100mm or more , 110mm or more, 120mm or more, 130mm or more, 140mm or more or 150mm The upper limit is 150mm or less, 140mm or less, 130mm or less, 120mm or less, 110mm or less, 100mm or less, 90mm or less, 80mm or less, 70 mm or less, 60mm or less, 70mm or less, 60mm or less, 50mm or less, 40mm or less, It can be 30mm or less or 20mm or less.

[0130] In a specific example of the present application, the filter having said length is also circular in cross section and The circumference of the circular cross section may be 10 to 30 mm. The lower limit is 15 mm or more, 20 mm or more, or 25 mm or more, and the upper limit is However, it can also be 25mm or less, 20mm or less, or 15mm or less.

[0131] Although not particularly limited, before filling the tow into the filter paper, the tow may be subjected to an opening treatment or A plasticizer treatment may be carried out.

[0132] In one embodiment, the cigarette filter manufactured by the above method is KS H IS The resistance to suction measured by O 6565 can satisfy 185 mmH2O or more. In general, the resistance to drawing of the cigarette filter is 190 mmH2O or more, 200 mmH2O or less. Top, 210mmH2O or more, 220mmH2O or more, 230mmH2O or more, 240mm H2O or more, 250mmH2O or more, 260mmH2O or more, 270mmH2O or more, 2 80mmH2O or more, 290mmH2O or more, 300mmH2O or more, 310mmH2O or more, 320mmH2O or more, 330mmH2O or more, 340mmH2O or more, 350m mH2O or more, 360mmH2O or more, 370mmH2O or more, 380mmH2O or more, 390mmH2O or more, 400mmH2O or more, 410mmH2O or more, 420mmH2 O or higher, 430mmH2O or higher, 440mmH2O or higher, or 450mmH2O or higher The upper limit of the suction resistance is, for example, 920 mmH2O or less. In the above, the upper limit of the suction resistance is, for example, 910 mmH2O or less, 900 mmH2O or less, 890mmH2O or less, 880mmH2O or less, 870mmH2O or less, 860mmH2 O or less, 850mmH2O or less, 840mmH2O or less, 830mmH2O or less, 820 mmH2O or less, 810mmH2O or less, 800mmH2O or less, 750mmH2O or less , 650mmH2O or less, 600mmH2O or less, 550mmH2O or less, 500mmH 2O or less, 450mmH2O or less, 400mmH2O or less, 390mmH2O or less, 38 0mmH2O or less, 370mmH2O or less, 360mmH2O or less, 350mmH2O or more Bottom, 340mmH2O or less, 330mmH2O or less, 320mmH2O or less, 310mm H2O or less, 300mmH2O or less, 290mmH2O or less, 280mmH2O or less, 2 70mmH2O or less, 260mmH2O or less, 250mmH2O or less, 240mmH2O or less, 230mmH2O or less, 220mmH2O or less, 210mmH2O or less or 20 It is also below 0mmH2O.

[0133] Although not particularly limited, the resistance to attraction is preferably 10 to 30 mm in circumference, or 1 It has also been measured on filter rods that are 5 to 27 mm. The circumference of the tow depends on the number of crimps in the tow, the quality of the tow (e.g., uniformity of the crimp shape), etc. The suction resistance can be determined by factors such as the fineness and cross-sectional shape.

[0134] Although not particularly limited, the suction resistance is 5,000 to 15,000 CU The filter includes a wrapper having a porosity of 60 to 150 mm in length. It has also been measured on the

[0135] Although not particularly limited, the suction resistance is preferably set to a value between 300 and 1.00 0 mg, 400 to 900 mg, 500 to 800 mg, or 600 to 700 It was also measured on a rod-shaped filter with a tensile strength of 10 ...

[0136] As mentioned above, the present application is directed to the fineness range mentioned above, specifically, regular filters. And a lyocell material with a fineness that can ensure a wide range of filter performance suitable for (ultra) slim filters. And, a cigarette filter containing such a lyocell material can provide a predetermined suction resistance. may have resistance.

[0137] For example, the lyocell material may be used in (ultra) slim filters (e.g., filters with a circumference of 100 mm). Specifically, the upper limit of the circumference is, for example, 18.5 mm or less. Below, 18mm or less, 17.5mm or less, 17mm or less, 16.5mm or less, The lower limit is, for example, 15.0 mm or more, 15.5 mm or more, 16.5 mm or more, 17.0 mm or more. (m or more, 17.5mm or more, 18.0mm or more, or 18.5mm or more) When the lyocell multifilament is used, the total fineness of the lyocell multifilament is 15,000 to 25,0 00 denier range. Specifically, Lyocell Malt, which is used in ultra-slim filters, The total fineness of the filaments is 16,000 denier or more, 17,000 denier or more, 8,000 denier or more, 19,000 denier or more, 20,000 denier or more, 21 ,000 denier or more, 22,000 denier or more, 23,000 denier or more or 2 It is 4,000 denier or more, and 24,000 denier or less, 23,000 denier or less 22,000 denier or less, 21,000 denier or less, 20,000 denier or less 19,000 denier or less, 18,000 denier or less, 17,000 denier or less or 16,000 denier or less. In such cases, lyocell monofilament The single yarn size of the woven fabric is 4.5 denier or more, for example, 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier or more, 7.0 denier or more or 7.5 denier Cigarette filters containing Lyocell material of such fineness are KS HI The resistance to suction measured according to ISO 6565 is 370 mmH2O or more. In the cigarette filter, the viscosity is 380 mmH2O or more, 390 mmH2O or more, 400 mmH2O or more H2O or more, 410mmH2O or more, 420mmH2O or more, 430mmH2O or more, 4 40mmH2O or more, 450mmH2O or more, 460mmH2O or more, 470mmH2O or more, 480mmH2O or more, 490mmH2O or more, 500mmH2O or more, 510m mH2O or more, 520mmH2O or more, 530mmH2O or more, 540mmH2O or more, 550mmH2O or more, 560mmH2O or more, 570mmH2O or more, 580mmH2 The resistance to draw may be greater than 590 mmH2O, or greater than 600 mmH2O. In this case, the upper limit of the suction resistance is, for example, 920 mmH2O or less, specifically, 900 mmH2O. 2O or less, 850mmH2O or less, 800mmH2O or less, 750mmH2O or less, 70 It is also below 0mmH2O or below 650mmH2O.

[0138] In another embodiment, the lyocell material is a regular filter (e.g., a filter rod). The circumference of the item is 19 mm or more. Specifically, the lower limit of the circumference is, for example, 19. 5mm or more, 20.0mm or more, 20.5mm or more, 21.0mm or more, 21.5mm or more Top, 22.0mm or more, 22.5mm or more, 23.0mm or more, 23.5mm or more, 24 .0mm or more, 24.5mm or more, 25mm or more, 25.5mm or more, 26.0mm or more Or it may be 26.5 mm or more, and the upper limit may be, for example, 27.0 mm or less, 26.5 mm or less. m or less, 26.0mm or less, 25.5mm or less, 25.0mm or less, 24.5mm or less, 24.0mm or less, 23.5mm or less, 23.0mm or less, 22.5mm or less, 22.0 mm or less, 21.5mm or less, 21.0mm or less, 20.5mm or less, 20.0mm or less or 19.5 mm or less), when used in the said lyocell multifilament The total fineness of the yarn is in the range of 25,000 to 45,000 denier. The total fineness of the Lyocell multifilament used in the tubular filter is 26,000 or more. Above, 27,000 or more, 28,000 or more, 29,000 or more, 30,000 or more, 31 ,000 or more, 32,000 or more, 33,000 or more, 34,000 or more, 35,000 Over 36,000, Over 37,000, Over 38,000, Over 39,000, 4 40,000 or more, 41,000 or more, 42,000 or more, 43,000 or more, or 44, 000 or more, and 44,000 or less, 43,000 or less, 42,000 or less , 41,000 or less, 40,000 or less, 39,000 or less, 38,000 or less, 37, 000 or less, 36,000 or less, 35,000 or less, 34,000 or less, 33,000 or less Below, 32,000 or less, 31,000 or less, 30,000 or less, 29,000 or less, 28 ,000 or less, 27,000 or less, or 26,000 or less. The single yarn fineness of the yossel monofilament is 5.0 denier or less, for example, 4.5 denier or less. Below, 4.0 denier or less, 3.5 denier or less, 3.0 denier or less, 2.5 denier or less or 2.0 denier or less. The filter has a resistance to suction of 185 mmH2O or more as measured by KS H ISO 6565. Specifically, the cigarette filter has a viscosity of 190 mmH2O or more, 200 mmH2O or more, 2O or more, 210mmH2O or more, 220mmH2O or more, 230mmH2O or more, 24 0mmH2O or more, 250mmH2O or more, 260mmH2O or more, 270mmH2O or more Top, 280mmH2O or more, 290mmH2O or more, 300mmH2O or more, 310mm H2O or more, 320mmH2O or more, 330mmH2O or more, 340mmH2O or more, 3 Suction resistance of 50mmH2O or more, 360mmH2O or more, or 370mmH2O or more The upper limit of the suction resistance is, for example, 500 mmH2O or less, 450 mmH2O or less. It is also below 2O or 400mmH2O.

[0139] A filter having the above-mentioned resistance to attraction value is effective in reducing the concentration of smoke when a user smokes a cigarette. It can provide uniformity of intensity and excellent filter performance.

[0140] In yet another embodiment of the present application, the present application relates to a cigarette filter. The cigarette filter includes a modified cross-section lyocell material, and the lyocell material is It is also the same thing as the place.

[0141] Specifically, the modified cross-section lyocell material contained in the filter is lyocell multifilament. It is also a crimped tow produced by crimping a ment. The lyocell multifilament includes a modified cross-section monofilament, The total fineness of the lyocell multifilament is 15,000 to 45,000 denier, The monofilament forming the lamination has a single yarn fineness of 1.5 to 8.0 denier. The modified cross section of the monofilament has at least three projections, and the projections are It may have a degree of deformation of 0.6 or more and a width ratio of 0.5 to 2.0. The typical values ​​are as described above. Also, as described above, the values ​​related to the irregularity and width ratio are The calculation can be done as follows:

[0142] [Equation 1] Irregularity=L / W

[0143] [Equation 2] Width ratio = W1 / W2

[0144] In the above relations 1 and 2, L means the length of the protrusion, and if any one of the protrusions , and from the center of the line connecting the two points where it meets the two protrusions directly adjacent to it It is calculated by the distance to the end point of the protrusion. And W means the width of the protrusion. The protrusion width W1 at a point corresponding to 10% of the length L and the protrusion width W2 at a point corresponding to 90% of the length L are The specific explanation is as above. do.

[0145] In one example, the lyocell material has a crimp roughness expressed by the following formula 1: The material is fed into the crimping device so that the crimp can be given under the condition that the crimp ratio is satisfied. It is also a crimped tow manufactured by

[0146] [Formula 1] 1.01≦crimp draft ratio≦1.30

[0147] In the above formula 1, the crimp draft ratio is calculated by V1 / V0. , V0 is the moving speed of the multifilament before it is fed into the crimping device; V1 means the threading of the filament gripped by the rollers in the crimping device. It means overspeed.

[0148] In one example, the tow has 20 to 50 crimps per inch. The specific explanation is as described above.

[0149] In one embodiment, the lyocell material contained in the cigarette filter is the above-mentioned lyocell It is also manufactured by the manufacturing method of the material. Specifically, the above-mentioned spinning, coagulation, and water washing It is also manufactured through both the oil treatment and crimping steps.

[0150] In one example, the cigarette filter further comprises a cigarette paper. The cigarette filter includes a lyocell material and a wrapper that encases the lyocell material. The explanation regarding the wrapping paper has been given above, so it will be omitted here.

[0151] In one embodiment, the cigarette filter has a viscosity measured according to KS H ISO 6565. The resistance to drawing can satisfy 185 mmH2O or more. The suction resistance of the pump is 190mmH2O or more, 200mmH2O or more, or 210mmH2O or more. , 220mmH2O or more, 230mmH2O or more, 240mmH2O or more, 250mmH 2O or more, 260mmH2O or more, 270mmH2O or more, 280mmH2O or more, 29 0mmH2O or more, 300mmH2O or more, 310mmH2O or more, 320mmH2O or more Top, 330mmH2O or more, 340mmH2O or more, 350mmH2O or more, 360mm H2O or more, 370mmH2O or more, 380mmH2O or more, 390mmH2O or more, 4 00mmH2O or more, 410mmH2O or more, 420mmH2O or more, 430mmH2O or more, 440mmH2O or more, or 450mmH2O or more. The upper limit of the resistance is, for example, 920 mmH2O or less. For example, 910mmH2O or less, 900mmH2O or less, 890mmH2O or less, 8 80mmH2O or less, 870mmH2O or less, 860mmH2O or less, 850mmH2O Below, 840mmH2O or less, 830mmH2O or less, 820mmH2O or less, 810m mH2O or less, 800mmH2O or less, 750mmH2O or less, 650mmH2O or less, 600mmH2O or less, 550mmH2O or less, 500mmH2O or less, 450mmH2 or less than 400mmH2O, more specifically, less than 390mmH2O, 380 mmH2O or less, 370mmH2O or less, 360mmH2O or less, 350mmH2O or less , 340mmH2O or less, 330mmH2O or less, 320mmH2O or less, 310mmH 2O or less, 300mmH2O or less, 290mmH2O or less, 280mmH2O or less, 27 0mmH2O or less, 260mmH2O or less, 250mmH2O or less, 240mmH2O or more Below, 230mmH2O or less, 220mmH2O or less, 210mmH2O or less or 200 It is also below mmH2O.

[0152] Although not particularly limited, the resistance to attraction is preferably 10 to 30 mm in circumference, or 1 It has also been measured on filter rods that are 5 to 27 mm. The circumference of the tow depends on the number of crimps in the tow, the quality of the tow (e.g., uniformity of the crimp shape), etc. The suction resistance can be determined by factors such as the fineness and cross-sectional shape.

[0153] Although not particularly limited, the suction resistance is 5,000 to 15,000 CU The filter includes a wrapper having a porosity of 60 to 150 mm in length. It has also been measured on the

[0154] Although not particularly limited, the suction resistance is preferably set to a value between 300 and 1.00 0 mg, 400 to 900 mg, 500 to 800 mg, or 600 to 700 It was also measured on a rod-shaped filter with a tensile strength of 10 ...

[0155] As mentioned above, the present application is directed to the fineness range mentioned above, specifically, regular filters. And a lyocell material with a fineness that can ensure a wide range of filter performance suitable for (ultra) slim filters. And, a cigarette filter containing such a lyocell material can provide a predetermined suction resistance. may have resistance.

[0156] For example, the lyocell material may be used in (ultra) slim filters (e.g., filters with a circumference of 100 mm). Specifically, the upper limit of the circumference is, for example, 18.5 mm or less. Below, 18mm or less, 17.5mm or less, 17mm or less, 16.5mm or less, The lower limit is, for example, 15.0 mm or more, 15.5 mm or more, 16.5 mm or more, 17.0 mm or more. (m or more, 17.5mm or more, 18.0mm or more, or 18.5mm or more) When the lyocell multifilament is used, the total fineness of the lyocell multifilament is 15,000 to 25,0 00 denier range. Specifically, Lyocell Malt, which is used in ultra-slim filters, The total fineness of the filaments is 16,000 denier or more, 17,000 denier or more, 8,000 denier or more, 19,000 denier or more, 20,000 denier or more, 21 ,000 denier or more, 22,000 denier or more, 23,000 denier or more or 2 It is 4,000 denier or more, and 24,000 denier or less, 23,000 denier or less 22,000 denier or less, 21,000 denier or less, 20,000 denier or less 19,000 denier or less, 18,000 denier or less, 17,000 denier or less or 16,000 denier or less. In such cases, lyocell monofilament The single yarn size of the woven fabric is 4.5 denier or more, for example, 5.0 denier or more, 5.5 denier or more, 6.0 denier or more, 6.5 denier or more, 7.0 denier or more or 7.5 denier Cigarette filters containing Lyocell material of such fineness are KS HI The resistance to suction measured according to ISO 6565 is 370 mmH2O or more. In the cigarette filter, the viscosity is 380 mmH2O or more, 390 mmH2O or more, 400 mmH2O or more H2O or more, 410mmH2O or more, 420mmH2O or more, 430mmH2O or more, 4 40mmH2O or more, 450mmH2O or more, 460mmH2O or more, 470mmH2O or more, 480mmH2O or more, 490mmH2O or more, 500mmH2O or more, 510m mH2O or more, 520mmH2O or more, 530mmH2O or more, 540mmH2O or more, 550mmH2O or more, 560mmH2O or more, 570mmH2O or more, 580mmH2 The resistance to draw may be greater than 590 mmH2O, or greater than 600 mmH2O. In this case, the upper limit of the suction resistance is, for example, 920 mmH2O or less, specifically, 900 mmH2O. 2O or less, 850mmH2O or less, 800mmH2O or less, 750mmH2O or less, 70 It is also below 0mmH2O or below 650mmH2O.

[0157] In another embodiment, the lyocell material is a regular filter (e.g., a filter rod). The circumference of the item is 19 mm or more. Specifically, the lower limit of the circumference is, for example, 19. 5mm or more, 20.0mm or more, 20.5mm or more, 21.0mm or more, 21.5mm or more Top, 22.0mm or more, 22.5mm or more, 23.0mm or more, 23.5mm or more, 24 .0mm or more, 24.5mm or more, 25mm or more, 25.5mm or more, 26.0mm or more Or it may be 26.5 mm or more, and the upper limit may be, for example, 27.0 mm or less, 26.5 mm or less. m or less, 26.0mm or less, 25.5mm or less, 25.0mm or less, 24.5mm or less, 24.0mm or less, 23.5mm or less, 23.0mm or less, 22.5mm or less, 22.0 mm or less, 21.5mm or less, 21.0mm or less, 20.5mm or less, 20.0mm or less or 19.5 mm or less), when used in the said lyocell multifilament The total fineness of the yarn is in the range of 25,000 to 45,000 denier. The total fineness of the Lyocell multifilament used in the tubular filter is 26,000 or more. Above, 27,000 or more, 28,000 or more, 29,000 or more, 30,000 or more, 31 ,000 or more, 32,000 or more, 33,000 or more, 34,000 or more, 35,000 Over 36,000, Over 37,000, Over 38,000, Over 39,000, 4 40,000 or more, 41,000 or more, 42,000 or more, 43,000 or more, or 44, 000 or more, and 44,000 or less, 43,000 or less, 42,000 or less , 41,000 or less, 40,000 or less, 39,000 or less, 38,000 or less, 37, 000 or less, 36,000 or less, 35,000 or less, 34,000 or less, 33,000 or less Below, 32,000 or less, 31,000 or less, 30,000 or less, 29,000 or less, 28 ,000 or less, 27,000 or less, or 26,000 or less. The single yarn fineness of the yossel monofilament is 5.0 denier or less, for example, 4.5 denier or less. Below, 4.0 denier or less, 3.5 denier or less, 3.0 denier or less, 2.5 denier or less or 2.0 denier or less. The filter has a resistance to suction of 185 mmH2O or more as measured by KS H ISO 6565. Specifically, the cigarette filter has a humidity of 190 mmH2O or more, 200 mmH2O or more. O or more, 210mmH2O or more, 220mmH2O or more, 230mmH2O or more, 240 mmH2O or more, 250mmH2O or more, 260mmH2O or more, 270mmH2O or more , 280mmH2O or more, 290mmH2O or more, 300mmH2O or more, 310mmH 2O or more, 320mmH2O or more, 330mmH2O or more, 340mmH2O or more, 35 Resistance to suction is 0mmH2O or more, 360mmH2O or more, or 370mmH2O or more In this case, the upper limit of the suction resistance is, for example, 500 mmH2O or less, 450 mmH2O or less. It is also below 0 or 400 mmH2O.

[0158] A filter having the above-mentioned resistance to attraction value is effective in reducing the concentration of smoke when a user smokes a cigarette. It can provide uniformity of intensity and excellent filter performance. [Effects of the Invention]

[0159] According to the present application, cellulose acetate (CA) is used as a substitute for the widely used cellulose acetate. A replaceable lyocell material for cigarette filters and a cigarette filter comprising the same are provided. Specifically, the present application aims to provide a filter that is not only excellent in biodegradability but also has excellent filter manufacturing processability. and the invention has the effect of providing excellent cigarette physical properties (e.g., resistance to draw). [Brief explanation of the drawings]

[0160] [Figure 1] 1 is a schematic diagram illustrating the cross-sectional shape, the degree of deformation and the width ratio in a predetermined range of a modified cross-section lyocell fiber according to an embodiment of the present invention. [Figure 2] 1 is an optical image of a cross section of the Lyocell material produced in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0161] The functions and effects of the present invention will be explained in more detail below through specific examples of the present invention. However, they are presented as examples of the invention and are not intended to be limiting. The scope of the patent right is not limited in any way.

[0162] Examples and Comparative Examples Lyocell materials were produced through the processes described in the following examples and comparative examples. Any conditions not specifically mentioned are within the scope of the above description.

[0163] Example 1 Cellulose pulp with a degree of polymerization (DPw) of 820 and an α-cellulose content of 93.9% N-methylmorpholine-N-oxide containing 0.01 wt% of propyl gallate (NMMO) / H2O solvent, and the concentration was 11 wt%. Then, the spinning dope was poured from the Y-shaped cross section forming spinning nozzle at a spinning temperature. The temperature was kept at 110°C, and the filament was spun to a single yarn fineness of 3.45 denier. The output amount and spinning speed were adjusted to spin the spinning dope.

[0164] The filament-shaped spinning dope discharged from the spinning nozzle passes through an air gap section, The coagulation liquid in the coagulation tank (75 wt% water and N-methylmorpholine-N-oxide (NMMO) The solidified liquid was then fed to a coagulation liquid (having a concentration of 25 wt% and a temperature of about 25°C). The cooling air in the gap section is 8°C and 200 Nm 3 / h air volume, spinning The dope is solidified first. Also, the concentration of the solidifying liquid is continuously monitored using a sensor and a refractometer. I grinned.

[0165] The solidified lyocell filaments were then washed with water. The filament is introduced into the drawing roller, and the filament is washed with water sprayed from the water washing device. The N-methylmorpholine-N-oxide (NMMO) remaining in the cement was removed. The washed filament was then immersed in a bath designed to have an oil concentration of 2 wt%. Ta.

[0166] The filament is pulled by a nip roll at the discharge section of the bath. f / cm 2 The fabric was then subjected to pressure and placed in a crimping device for creasing. The limp ratio (crimp draft ratio) is set to 1.1 times the condition, and the steam box , steam pressure 0.5kgf / cm 2 The pressure of the crimping device roller is 2.5 kgf / cm 2 The pressure of the doctor blade is set to 0.5 kgf / cm 2 The crimp ratio was calculated as described above. .

[0167] The tow is then subjected to a secondary oil treatment to prevent static electricity and provide flexibility. The tow was passed through a continuous drying device set at 120°C to obtain a dried tow product. The total fineness of the tow is as shown in Table 1.

[0168] Example 2 The same as in Example 1, except that the single filament fineness was adjusted to 4.6 denier. Lyocell tow for cigarette filters was produced by a method. The total fineness of the tow is shown in Table 1. It is as stated.

[0169] Example 3 The same as Example 1 except that the single filament fineness was 5.55 denier. Lyocell tow for cigarette filters was produced by the method described in Table 1. There is a street called

[0170] Example 4 Same as Example 1 except that the filament single yarn fineness is 6.98 denier Lyocell tow for cigarette filters was produced by this method. The total fineness of the tow is shown in Table 1. It is as expected.

[0171] Comparative Example 1 Same as Example 1 except that the filament single yarn fineness is 0.55 denier Lyocell tow for cigarette filters was produced by this method. The total fineness of the tow is shown in Table 1. It is as expected.

[0172] Comparative Example 2 Same as Example 1 except that the filament single yarn fineness is 1.12 denier Lyocell tow for cigarette filters was produced by this method. The total fineness of the tow is shown in Table 1. It is as expected.

[0173] Comparative Example 3 Same as Example 1 except that the filament single yarn fineness is 1.43 denier Lyocell tow for cigarette filters was produced by this method. The total fineness of the tow is shown in Table 1. It is as expected.

[0174] Comparative Example 4 Same as Example 1 except that the filament single yarn fineness is 8.85 denier Lyocell tow for cigarette filters was produced by this method. The total fineness of the tow is shown in Table 1. It is as expected.

[0175] Comparative Example 5 Same as Example 1 except that the filament single yarn fineness is 9.94 denier Lyocell tow for cigarette filters was produced by this method. The total fineness of the tow is shown in Table 1. It is as expected.

[0176] Evaluation or measurement of tows in Examples and Comparative Examples The following items were measured or evaluated for each of the examples and comparative examples, and the results are shown in Table 1. It was written.

[0177] 1. Tow fineness (denier) The tow to be measured was taken as a 2m sample and stored at a constant temperature and humidity of 20°C and 65%. The tow is left in a room for 24 hours to stabilize. One end of the stabilized tow is fixed. A 2 kg weight is attached to the opposite end of the tow. The tow is kept stretched by the load for 5 seconds. After stabilization, the sample is cut into 90cm pieces and weighed. (Total fineness). Fineness is calculated by multiplying the measured weight by 10,000 using the denier conversion method. Dividing the total size by the number of filaments gives the single yarn size.

[0178] 2. Number of crimps Measured according to KS K 0326 standard. Specifically, the crimp is not damaged. Take 0 tow samples and attach a pre-prepared glossy specimen (25mm clearance) to the celluloid 4% or 5% amyl acetate adhesive, one single fiber at a time, 25 mm thick After attaching, allow it to stretch ±5% and then leave it to dry.

[0179] For this sample, a crimp tester was used, and each sample was tested at 1.96 / 1, An initial load equivalent to 000cN (=2mgf) was applied and the number of crimps in a 25mm interval was calculated. The upper and lower limits of the number of crimps measured for the 20 pieces were then recorded.

[0180] 3. Measurement of protrusion irregularity A small amount of fiber bundle is sampled, rolled up with black cotton to make it thinner, and the cross section can be cut. After inserting it into the hole in the plate, the cross section was cut with a razor blade so as not to be pushed in. The cut cross section was then enlarged using an optical microscope (BX51 (Olympus)). The specimens were observed under magnification of 200x and images were saved on a digital camera.

[0181] Measurements were taken from cross-sectional images of the fibers using the Olympus Soft Imaging Solution program. The L (protrusion length), W (protrusion width), and perimeter of the irregular cross-section yarn were analyzed. W and the degree of deformation were calculated identically as defined above.

[0182] 4. Measurement of protrusion width ratio The sample was prepared in the same manner as in the above-mentioned irregularity measurement, and the Olympus Soft Imaging Solution Using the ion program, the measurement reference line length (measurement related to the degree of irregularity) was calculated from the cross-sectional image of the fiber. The protrusion width W1 at the point corresponding to 10% of the reference line length (the difference Measure the protrusion width W2 at the point corresponding to 90% of the measured length L) related to the shape, and was calculated.

[0183] 5. Spinnability After the spinning dope is discharged from the spinneret, the thread breakage on the surface of the spinneret is measured every hour. The occurrence and number of occurrences were recorded. The number of thread breaks that occurred in 24 hours was classified as follows: was rated as.

[0184] Good: No thread breakage occurs within 24 hours Normal: Thread breaks occur 1 to 4 times per 24 hours Unacceptable: Thread breakage occurs more than 5 times in 24 hours

[0185] 6. Resistance to draw and circumference of cigarette filters Tobacco filter rods were manufactured using the tows manufactured in the examples and comparative examples. (Rod weight 650 mg) Specifically, the lyocell produced in the examples and comparative examples The tow is wrapped in wrapping paper (6,500 CU porous paper) and has an axial length of 120 mm. Cylindrical filter rods were manufactured with circumferences as shown in the table below.

[0186] Then, based on the KS H ISO 6565 standard, a suction resistance measuring instrument and a circumference measuring instrument were used. The suction resistance of each rod was measured using this method.

[0187] [Table 1]

[0188] As can be seen in Table 1, the examples according to the present application show that the tow has a predetermined shape and It is confirmed that the fineness satisfies a predetermined range and can provide improved resistance to attraction.

[0189] However, in the case of Comparative Example 1, the spinning conditions were not appropriate, and it was not possible to produce a tow. It was not possible to check the filter's performance (suction resistance). In the case of Comparative Examples 2 to 5, which have different surface shapes and finenesses from those of the Examples, the regular filter (circumferential size approx. 23 to 24.5 mm) and (ultra) slim filters (circumferential size It has a corresponding circumference size in both cases (approximately 16-19 mm) It was confirmed that the resistance to attraction was lower than that of the example.

Claims

1. Using a spinneret capable of forming a modified cross section having at least three projections, spinning the yarn; coagulating the spun lyocell dope to obtain a lyocell multifilament; Treating the lyocell multifilament with an oil; The oil-treated lyocell multifilament is subjected to steam and pressure. and a crimping step of feeding the lyocell multifilament into a crimping device. 、 The lyocell multifilament includes a monofilament having a modified cross section, The profiled cross section has at least three protrusions, The protrusions have a degree of deformation calculated by the following relational expression 1 of 0.6 or more, and The width ratio calculated by the following relation 2 is between 0.5 and 2.0, The total fineness of the lyocell multifilament is 15,000 to 45,000 denier. The single filament fineness of the monofilament constituting the lyocell multifilament is 1. A method for producing a modified cross-section lyocell material for cigarette filters, having a denier of 5 to 8.0: [Relationship 1] Irregularity = L / W [Relationship 2] Amplitude ratio = W １ / W ２ In the above-mentioned relations 1 and 2, L means the length of the protrusion, and either one The line connecting the two points where the protrusion meets the two protrusions directly adjacent to it It is calculated by the distance from the center to the end point of the protrusion, and W means the width of the protrusion. and the projection width W at a point corresponding to 10% of the length L １ And, at the point that corresponds to 90% Protrusion width W ２ It is calculated by the arithmetic mean of

2. In the crimping step, pressure is applied to the lyocell multifilament by a roller. Added, The crimping step satisfies a crimp draft ratio expressed in the following Equation 1. The manufacturing method of the modified cross-section Lyocell material for cigarette filters according to claim 1 is carried out in such a manner that Construction method: [Formula 1] 1.01≦crimp draft ratio≦1.30 However, in the above formula 1, the crimp draft ratio is V １ / V ０ is calculated by , V ０ The oil-treated multifilament is the filament before it is fed into the crimping device. It means the movement speed of the １ is a crimping device in which the frame is gripped by the rollers. This means the speed at which the filaments pass.

3. 10. The method of claim 1, wherein the tow has 20 to 50 crimps per inch. A method for producing the modified cross-section lyocell material for cigarette filters according to the present invention.

4. The total fineness of the lyocell multifilament is 15,000 to 25,000 denier.

2. A method for producing a modified cross-section lyocell material for cigarette filters according to claim 1, wherein the modified cross-section lyocell material is a lyocell material.

5. The total fineness of the lyocell multifilament is 25,000 to 45,000 denier.

2. A method for producing a modified cross-section lyocell material for cigarette filters according to claim 1, wherein the modified cross-section lyocell material is a lyocell material.

6. It is a crimped tow made by crimping lyocell multifilament. The total fineness of the lyocell multifilament is 15,000 to 45,000 denier. It is The single filament fineness of the monofilament constituting the lyocell multifilament is 1.5 to 8.0 denier, The lyocell multifilament includes a monofilament having a modified cross section, The profiled cross section has at least three protrusions, The protrusions have a degree of deformation of 0.6 or more calculated by the following relation 1, and a degree of deformation of 0.6 or more calculated by the following relation 2. A profile cut for a cigarette filter having a width ratio of 0.5 to 2.0 calculated by formula 2 Lyocell fabric: [Relationship 1] Irregularity = L / W [Relationship 2] Amplitude ratio = W １ / W ２ In the relations 1 and 2, L means the length of the protrusion, and The center of the line connecting the two points where the rising edge meets the two protrusions directly adjacent to it is calculated by the distance from the end point of the protrusion to the end point of the protrusion, and W means the width of the protrusion. , the projection width W at a point corresponding to 10% of the L length １ And at the point that corresponds to 90% Protrusion width W ２ It is calculated by the arithmetic mean of

7. The crimp draft ratio is expressed by the following formula 1. The tabacco according to claim 6, which is manufactured by being put into a crimping device so that a crimp can be applied. Lyocell material with irregular cross section for co-filters: [Formula 1] 1.01≦crimp draft ratio≦1.30 However, in the above formula 1, the crimp draft ratio is V １ / V ０ is calculated by , V ０ is the moving speed of the multifilament before it is fed into the crimping device means V １ The crimping device is a crimping device for crimping a filament held by rollers. It means overspeed.

8. 7. The tobacco filler of claim 6 having 20 to 50 crimps per inch. Irregular cross-section lyocell material for Ruta.

9. The total fineness of the lyocell multifilament is 15,000 to 25,000 denier.

7. The modified cross-section lyocell material for cigarette filters according to claim 6, which is a lyocell material.

10. The total fineness of the lyocell multifilament is 25,000 to 45,000 denier.

7. The modified cross-section lyocell material for cigarette filters according to claim 6, which is a lyocell material.

11. Using a spinneret capable of forming a modified cross section having at least three projections, spinning the yarn; coagulating the spun lyocell dope to obtain a lyocell multifilament; Treating the lyocell multifilament with an oil; The oil-treated lyocell multifilament is subjected to steam and pressure. a crimping step of feeding the lyocell multifilament into a crimping device; and manufacturing a filter using the crimped tow; The lyocell multifilament includes a monofilament having a modified cross section, The profiled cross section has at least three protrusions, The protrusions have a degree of deformation calculated by the following relational expression 1 of 0.6 or more, and The width ratio calculated by the following relation 2 is between 0.5 and 2.0, The total fineness of the lyocell multifilament is 15,000 to 45,000 denier. The single filament fineness of the monofilament constituting the lyocell multifilament is 1. Method for producing a cigarette filter containing a modified cross-section lyocell material having a denier of 5 to 8.0 ： [Relationship 1] Irregularity = L / W [Relationship 2] Amplitude ratio = W １ / W ２ In the relations 1 and 2, L means the length of the protrusion, and The center of the line connecting the two points where the rising edge meets the two protrusions directly adjacent to it is calculated by the distance from the end point of the protrusion to the end point of the protrusion, and W means the width of the protrusion. , the projection width W at a point corresponding to 10% of the L length １ And at the point that corresponds to 90% Protrusion width W ２ It is calculated by the arithmetic mean of

12. In the crimping step, pressure is applied to the lyocell multifilament by a roller. Added, The crimping step satisfies a crimp draft ratio expressed in the following Equation 1.

12. A tobacco filler comprising the profiled cross-section lyocell material of claim 11, Manufacturing method: [Formula 1] 1.01≦crimp draft ratio≦1.30 However, in the above formula 1, the crimp draft ratio is V １ / V ０ is calculated by , V ０ The oil-treated multifilament is the filament before it is fed into the crimping device. It means the movement speed of the １ is a crimping device in which the frame is gripped by the rollers. This means the speed at which the filaments pass.

13. 12. The method of claim 11, wherein the tow has between 20 and 50 crimps per inch. A method for producing a cigarette filter comprising the above-mentioned modified cross-section lyocell material.

14. The total fineness of the lyocell multifilament is 15,000 to 25,000 denier. It is The resistance to suction measured by KS H ISO 6565 is 370 mmH ２ O or above 12. A method for producing a cigarette filter according to claim 11, wherein the method comprises: The resistance to draw is measured for filters with a circumference of 19 mm or less.

15. The total fineness of the lyocell multifilament is 25,000 to 45,000 denier. It is The resistance to suction measured by KS H ISO 6565 is 185 mmH ２ O or above 12. A method for producing a cigarette filter according to claim 11, wherein the method comprises: The resistance to draw is measured for filters with a circumference of 19 mm or greater.

16. A cigarette filter comprising a modified cross-section lyocell material, The modified cross-section lyocell material is manufactured by crimping lyocell multifilaments. It is a crimped toe, The total fineness of the lyocell multifilament is 15,000 to 45,000 denier. It is The single filament fineness of the monofilament constituting the lyocell multifilament is 1.5 to 8.0 denier, The lyocell multifilament includes a monofilament having a modified cross section, The profiled cross section has at least three protrusions, The protrusions have a degree of deformation of 0.6 or more calculated by the following relation 1, and a degree of deformation of 0.6 or more calculated by the following relation 2. A modified cross-section lyocell material having a width ratio of 0.5 to 2.0 calculated by Equation 2 Cigarette filters including: [Relationship 1] Irregularity = L / W [Relationship 2] Amplitude ratio = W １ / W ２ In the relations 1 and 2, L means the length of the protrusion, and The center of the line connecting the two points where the rising edge meets the two protrusions directly adjacent to it is calculated by the distance from the end point of the protrusion to the end point of the protrusion. And W is the width of the protrusion. The projection width W at a point corresponding to 10% of the L length １ This corresponds to 90% Protrusion width W at point ２ It is calculated by the arithmetic mean of

17. The lyocell material satisfies the crimp draft ratio expressed by the following formula 1. The product is put into a crimping device so that the crimp can be applied under the desired conditions. A cigarette filter comprising the profiled cross-section lyocell material of claim 16: [Formula 1] 1.01≦crimp draft ratio≦1.30 However, in the above formula 1, the crimp draft ratio is V １ / V ０ is calculated by , V ０ is the moving speed of the multifilament before it is fed into the crimping device means V １ The crimping device is a crimping device for crimping a filament held by rollers. It means overspeed.

18. 10. The method of claim 9, wherein the crimped tow has between 20 and 50 crimps per inch.

17. A cigarette filter comprising the modified cross-section lyocell material according to 16.

19. The total fineness of the lyocell multifilament is 15,000 to 25,000 denier. It is The cigarette filter has a resistance to draw of 3 or less as measured by KS H ISO 6565. 70mmH ２ 17. The cigarette filter according to claim 16, wherein the resistance to drawing is 0 or more. , measured on filters with circumferences of 19 mm or less).

20. The total fineness of the lyocell multifilament is 25,000 to 45,000 denier. It is The cigarette filter has a resistance to draw of 1.0 or less as measured by KS H ISO 6565. 85mmH ２ 17. The cigarette filter according to claim 16, wherein the resistance to drawing is 0 or more. , measured when producing a filter rod with a circumference of 19 mm or more) 。

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