Cigarette filter and smoking article comprising same

Abstract

Disclosed is a cigarette filter having a beautiful external appearance. According to one aspect, the cigarette filter comprises a paper sheet including pulp fibers, wherein the bulk of the paper sheet is 2 to 4 cm3 / g. The pulp fibers include at least one among: single fibers having an average coarseness of 13 mg / 100 m or more; and mixed fibers including sub-pulp fibers and regenerated fibers.

Description

Cigarette filters and smoking articles containing them

[0001] The present invention relates to a cigarette filter, and more particularly, to a cigarette filter, a smoking article including the same, and an aerosol generating device.

[0002] Filters used in cigarettes can be broadly categorized into cellulose acetate filters, paper filters, and charcoal filters. Commonly manufactured cellulose acetate filters may contain cellulose acetate tow.

[0003] Meanwhile, cellulose acetate filters were primarily used as cigarette filters, but they suffered from poor biodegradability. To address this issue, paper filters were proposed as an alternative.

[0004] When a compressed paper filter is applied to a mouth end (ME), there is a problem that the appearance is inferior to that of a cellulose acetate filter due to irregular or uneven holes between the folds of the paper.

[0005] The purpose of the present invention is to provide a cigarette filter having excellent appearance.

[0006] Another object of the present invention is to provide a cigarette filter having excellent biodegradability and particle removal ability.

[0007] Another object of the present invention is to provide a method for manufacturing the above cigarette filter.

[0008] Another object of the present invention is to provide a smoking article including the above cigarette filter.

[0009] Another object of the present invention is to provide an aerosol generating device comprising the smoking article.

[0010] The purposes of the present invention are not limited to those mentioned above, and other purposes and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through embodiments of the present invention. Furthermore, it will be readily apparent that the purposes and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0011] According to a first aspect of the present invention, a cigarette filter comprising a paper sheet comprising pulp fibers, wherein the bulk of the paper sheet is 2 to 4 cm 3 / g, and the pulp fibers include at least one of a single fiber having an average coarseness of 13 mg / 100 m or more; and a mixed fiber including sub-pulp fibers and regenerated fibers.

[0012] According to the second aspect of the present invention, in the first aspect, the content of the single fiber may be 70 wt% or more based on the total weight of the paper sheet.

[0013] According to a third aspect of the present invention, in the first or second aspect, the sub-pulp fiber may include pulp fiber derived from an evergreen tree.

[0014] According to a fourth aspect of the present invention, in any one of the first to third aspects, the weight ratio of the sub-pulp fibers and the regenerated fibers may be 9:1 to 5:5.

[0015] According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the average length of the pulp fibers may be 2 to 6 mm.

[0016] According to the sixth aspect of the present invention, in any one of the first to fifth aspects, the porosity of the paper sheet is 500 to 10,000 CU (CORESTA Unit, cm) in accordance with ISO 2965.3 / (min·cm 2 ·kPa)) may be.

[0017] According to a seventh aspect of the present invention, a smoking article is provided, comprising a first part comprising a medium and a second part comprising a filter element, wherein the filter element comprises a cigarette filter according to any one of the first to sixth aspects.

[0018] According to an eighth aspect of the present invention, in the seventh aspect, the smoking article further includes a third part interposed between the first part and the second part, and the third part may include a first cooling element or a tube filter.

[0019] According to a ninth aspect of the present invention, in the seventh or eighth aspect, the smoking article further includes a fourth part arranged on one side of the first part, and at least one of the second part and the fourth part may include the paper sheet.

[0020] According to a tenth aspect of the present invention, in any one of the seventh to ninth aspects, the second part may include the paper sheet.

[0021] According to an eleventh aspect of the present invention, in any one of the seventh to tenth aspects, the second part and the fourth part may include the paper sheet.

[0022] According to a twelfth aspect of the present invention, in any one of the seventh to ninth aspects, the fourth portion may include a second cooling element.

[0023] The solutions to the above problems do not enumerate all features of the present invention. The various features of the present invention, along with their corresponding advantages and effects, can be understood in more detail by referring to the specific examples below.

[0024] According to one aspect of the present invention, a smoking article having excellent appearance can be realized by providing a cigarette filter having uniform holes and a regular cross-sectional shape when a paper sheet is rolled.

[0025] According to another aspect of the present invention, a cigarette filter having excellent biodegradability can be provided.

[0026] According to another aspect of the present invention, a cigarette filter having excellent particle removal ability can be implemented.

[0027] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0028] FIG. 1 is a schematic diagram of a paper sheet included in a cigarette filter according to one embodiment of the present invention.

[0029] Figure 2 is a flow chart showing a method for manufacturing a paper sheet according to one embodiment of the present invention.

[0030] Figure 3 is a perspective view showing a smoking article according to one embodiment of the present invention.

[0031] Figure 4 is a perspective view showing a smoking article according to another embodiment of the present invention.

[0032] Figure 5 is a perspective view showing a smoking article according to another embodiment of the present invention.

[0033] Figure 6 is an aerosol generating device to which a smoking article according to one embodiment of the present invention can be applied.

[0034] Figure 7 is an aerosol generating device to which a smoking article according to another embodiment of the present invention can be applied.

[0035] Figure 8 shows the ratio of the cavity area to the cross-section of the cigarette filter according to Example 1.

[0036] Figure 9 shows the hollow area ratio for the cross-section of a cigarette filter according to Comparative Example 1.

[0037] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0038] The numerical range indicated by the term "to" in this specification refers to a numerical range that includes the values ​​described before and after the term as the lower limit and the upper limit, respectively. When multiple numerical values ​​are disclosed as the upper and lower limits of an arbitrary numerical range, the numerical range disclosed in this specification can be understood as any numerical range that has any one of the multiple lower limit values ​​and any one of the multiple upper limit values ​​as the lower limit and the upper limit, respectively. For example, when a to b, or c to d is described in the specification, it can be understood that a or more and b or less, a or more and d or less, c or more and d or less, or c or more and b or less is described.

[0039] In this specification, expressions such as “first,” “second,” “first,” “second,” “(S1),” “(S2),” etc., may describe various components, regardless of order and / or importance, and do not limit the components. These expressions may be used to distinguish one component from another. For example, without departing from the scope of the present disclosure, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

[0040] In this specification, “At least one of a, b and c” may include a, b or c alone, or a combination of two or more selected from the group consisting of a, b and c.

[0041] As used herein, the term "smoking article" may refer to any smokeable product or any product capable of providing a smoking experience, whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, smoking articles may include smokeable products such as cigarettes, cigars, and cigarillos. As another example, smoking articles may include combustible smoking articles and heated smoking articles.

[0042] As used herein, "upstream" or "upstream direction" may refer to a direction away from the smoker's mouth, and "downstream" or "downstream direction" may refer to a direction toward the smoker's mouth. The terms "upstream" and "downstream" may be used to describe the relative positions of components constituting a smoking article.

[0043] In this specification, “longitudinal direction” may mean a direction corresponding to the longitudinal axis of the smoking article.

[0044] In this specification, "single fiber" may mean a fiber composed of one type of raw pulp. Specifically, the single fiber may mean an individual fiber strand forming a pulp fiber.

[0045] In this specification, “mixed fiber” is a concept contrasted with a single fiber, and may mean a fiber derived from two or more types of wood or plants; or a fiber that includes sub-pulp fibers as a raw material, but may additionally include regenerated fibers.

[0046] 1. Cigarette filters

[0047] According to one aspect of the present invention, a cigarette filter comprising a paper sheet containing pulp fibers, wherein the bulk of the paper sheet is 2 to 4 cm3 / g, and the pulp fibers include at least one of a single fiber having an average coarseness of 13 mg / 100 m or more; and a mixed fiber including sub-pulp fibers and regenerated fibers; Provided is a cigarette filter. When a conventional crimped paper filter is applied to a mouth end (ME), there is a problem that the appearance is inferior to that of a cellulose acetate filter due to irregular or uneven holes between the folds of the paper. According to one aspect of the present invention, by including the freeness (high degree of fineness), which has a major influence on the bulk of the paper sheet, the average coarseness in the single fiber, and the regenerated fiber in the mixed fiber, a cigarette filter having uniform holes and a regular cross-sectional shape can be implemented when the paper sheet is crimped. Accordingly, the present invention can implement a smoking article having excellent appearance and can deliver a clean image to the user.

[0048] Hereinafter, the configuration of the present invention will be described in more detail with reference to the drawings.

[0049] FIG. 1 is a schematic diagram of a paper sheet included in a cigarette filter according to one embodiment of the present invention.

[0050] Referring to Fig. 1, the paper sheet (100) according to the present invention can maintain a crimped structure in a cigarette filter. When this crimped paper sheet (100) is unwound, it can be transformed into a sheet-shaped paper filter (Fig. 1 (a)).

[0051] The paper sheet (100) according to the present invention includes pulp fibers (10a). Here, the pulp fibers (10a) may include at least one of single fibers and mixed fibers.

[0052] A single fiber according to the present invention may refer to a fiber composed of one or more types of raw pulp, either wood or vegetation. Specifically, the single fiber may refer to individual fiber strands forming a pulp fiber.

[0053] The mixed fiber according to the present invention may mean a fiber that includes sub-pulp fiber as a raw material, but may additionally include regenerated fiber. For example, the content of the sub-pulp fiber based on the total weight of the mixed fiber may be 50 wt% or more, 51 wt% or more, 52 wt% or more, 53 wt% or more, 54 wt% or more, 55 wt% or more, 56 wt% or more, 57 wt% or more, 58 wt% or more, 59 wt% or more, 60 wt% or more, 61 wt% or more, 62 wt% or more, 63 wt% or more, 64 wt% or more, 65 wt% or more, 66 wt% or more, 67 wt% or more, 68 wt% or more, 69 wt% or more, 70 wt% or more, 71 wt% or more, 72 wt% or more, 73 wt% or more, 74 wt% or more, 75 wt% or more, 76 wt% or more, 77 wt% or more, 78 wt% or more, 79 wt% or more, or 80 wt% or more. Specifically, the sub-pulp fibers may be the same as or different from the single fibers. For example, the regenerated fibers may include at least one of rayon and lyocell, and specifically may include rayon.

[0054] Meanwhile, the bulk of a paper sheet is the thickness value relative to the basis weight of the paper sheet. Generally, as the porosity of a paper sheet increases, its bulk also tends to increase. In the present invention, the bulk of a paper sheet may be a key factor influencing the appearance of the cross-section of the filter when the paper sheet is crimped.

[0055] According to some embodiments of the present invention, the bulk of the paper sheet is 2 cm 3 / g or more, 2.1 cm 3 / g or more, 2.2cm 3 / g or more, 2.3 cm 3 / g or more, 2.4 cm 3 / g or more, 2.5 cm 3 / g or more, 2.6 cm 3 / g or more, 2.7 cm 3 / g or more, 2.8 cm 3 / g or more, 2.9 cm 3 / g or more, 3.0 cm 3 / g or more, 3.1 cm 3 / g or more, 3.2 cm 3 / g or more, 3.3 cm 3 / g or more, 3.4 cm 3 / g or more, 3.5 cm 3 / g or more, 3.6 cm 3 / g or more, 3.7 cm 3 / g or more, 3.8 cm 3 / g or more, or 3.9 cm 3 / g or more; or, 4.0 cm 3 / g or less, 3.9 cm 3 / g or less, 3.8 cm 3 / g or less, 3.7 cm 3 / g or less, 3.6 cm 3 / g or less, 3.5 cm 3 / g or less, 3.4 cm 3 / g or less, 3.3 cm 3 / g or less, 3.2 cm 3 / g or less, 3.1 cm 3 / g or less, 3.0 cm 3 / g or less, 2.9 cm 3 / g or less, 2.8 cm 3 / g or less, 2.7 cm 3 / g or less, 2.6 cm 3 / g or less, 2.5 cm 3 / g or less, 2.4 cm 3 / g or less, 2.3 cm 3 / g or less, 2.2 cm 3 / g or less, or 2.1 cm 3 / g or less; or any numerical range in which any one of the plurality of lower limit values ​​and any one of the plurality of upper limit values ​​are set as the lower limit value and the upper limit value, respectively; Specifically, the bulk of the paper sheet is 2 to 4 cm 3 / g, 2.1 to 3.0 cm 3 / g, 2.14 to 2.9 cm 3 / g, 2.14 to 2.61 cm 3 / g, 2.5 to 2.61 cm 3 / g or 2.53 to 2.61 cm 3 / g may be. According to some embodiments of the present invention, when the bulk of the paper sheet is outside the above numerical range, when the paper sheet is crimped, a problem may arise in which the appearance of the filter deteriorates due to irregular and uneven holes. For example, even if the average roughness of a single fiber satisfies 13 mg / 100 m or more, when the bulk of the paper sheet is outside the above numerical range due to the water content being outside the appropriate level, a problem in which the appearance of the filter cross-section deteriorates due to irregular or uneven holes between the folds of the paper may arise.

[0056] Figure 2 is a flow chart showing a method for manufacturing a paper sheet according to one embodiment of the present invention.

[0057] Referring to FIG. 2, the method for manufacturing a paper sheet according to the present invention may include (S1) a step of preparing raw fibers; (S2) a step of dissociating and beating the raw fibers; and (S3) a step of manufacturing a paper sheet using the dissociated and beating raw fibers using a paper machine.

[0058] Meanwhile, dissociation is the process of completely separating raw fibers by stirring with water, and beating refers to the process of applying force to the dissociated raw fibers in water to cut and split them to a certain degree to give them papermaking properties, thereby finely fiberizing them. The characteristics of the finely fiberized pulp fibers can vary due to differences in the dissociation and beating methods and degrees, which can ultimately affect the structure and physical properties of the paper sheet. The more beating, the higher the freeness, and the less beating, the lower the freeness. Here, the freeness is an indicator that quantitatively determines how much the fibers have been refined. Pulp fibers manufactured with a high freeness can increase the strength of the paper, and the bonding of the fiber strands increases, allowing for the production of dense and relatively strong paper. On the other hand, pulp fibers manufactured with a low freeness can produce relatively soft paper by lowering the density of the fiber strands.

[0059] Specifically, in the above step (S1), the raw material fiber may be a fiber that becomes the raw material of pulp fiber, which will be described later, before being microfiberized. That is, depending on how much the raw material fiber is microfiberized, the bulk and porosity of the paper sheet may vary, and the appearance of the paper sheet may vary when applied to a smoking article. More specifically, the raw material fiber may be a fiber derived from wood or plants before being microfiberized; or a fiber before being microfiberized of a mixed fiber including sub-pulp fiber and regenerated fiber.

[0060] According to some embodiments of the present invention, in the process of beating the raw fiber, the freeness may be less than 20˚SR, 19˚SR or less, 18˚SR or less, 17˚SR or less, 16˚SR or less, 15˚SR or less, 14˚SR or less, or 13.5˚SR or less. Specifically, in the process of beating the raw pulp, the freeness may be 10˚SR or more and less than 20˚SR, 13 to 19˚SR, 13 to 18˚SR, 13 to 17˚SR, 13 to 16˚SR, 13 to 15˚SR, 13 to 14˚SR, or 13 to 13.5˚SR. According to some embodiments of the present invention, when the water content satisfies the numerical range during the process of refining the raw material fiber, the bulk performance of the paper sheet is also improved, so that a porous structure can be formed, and at the same time, when the paper sheet is crimped, the appearance of the cross-section of the filter can be improved.

[0061] The pulp fiber according to the present invention is a fiber strand distributed within the final product, a paper sheet, and may be a fiber that has been finely fiberized through a dissociation and refining process.

[0062] According to some embodiments of the present invention, the pulp fibers include at least one of a single fiber having an average coarseness of 13 mg / 100 m or more; and a mixed fiber including sub-pulp fibers and regenerated fibers. Here, the average coarseness refers to the average mass per unit length of the fibers.

[0063] Specifically, the average coarseness of the single fiber is 13 mg / 100m or more, 14 mg / 100m or more, 15 mg / 100m or more, 16 mg / 100m or more, 17 mg / 100m or more, 18 mg / 100m or more, 19 mg / 100m or more, 20 mg / 100m or more, 21 mg / 100m or more, 22 mg / 100m or more, 23 mg / 100m or more, 24 mg / 100m or more, 25 mg / 100m or more, 26 mg / 100m or more, 27 mg / 100m or more, or 28 mg / 100m or more; or 40 mg / 100 m or less, 39 mg / 100 m or less, 38 mg / 100 m or less, 37 mg / 100 m or less, 36 mg / 100 m or less, 35 mg / 100 m or less, 34 mg / 100 m or less, 33 mg / 100 m or less, 32 mg / 100 m or less, 31 mg / 100 m or less, 30 mg / 100 m or less, 29 mg / 100 m or less, or 28 mg / 100 m or less; or any range of values ​​having any one of the plurality of lower limit values ​​and any one of the plurality of upper limit values ​​as the lower limit value and the upper limit value, respectively. More specifically, the average roughness of the single fiber may be 13 mg / 100 m or more, 13 to 29 mg / 100 m, 14 to 29 mg / 100 m, 15 to 28 mg / 100 m, 16 to 28 mg / 100 m, 17 to 28 mg / 100 m, 18 to 28 mg / 100 m, 19 to 28 mg / 100 m, 20 to 28 mg / 100 m, 21 to 28 mg / 100 m, 22 to 28 mg / 100 m, 23 to 28 mg / 100 m, 24 to 28 mg / 100 m, 25 to 28 mg / 100 m, 26 to 28 mg / 100 m, or 27 to 28 mg / 100 m.

[0064] According to one aspect of the present invention, since the average roughness of the single fiber satisfies the above numerical range, when the paper sheet is crimped, a cigarette filter having uniform holes and a regular cross-sectional shape can be implemented. Accordingly, the present invention can implement a smoking article with excellent appearance and an effect of conveying a clean image to the user. Meanwhile, the roughness of the fiber is one of the characteristics of natural fibers such as wood and plants, and the higher the roughness, the more bulky the paper sheet can exhibit. If the roughness is low, the number of points where the fibers come into contact with each other and form hydrogen bonds increases, which can reduce the porosity of the paper sheet, increase the tensile strength, and form an entangled structure between the fibers.

[0065] For example, the average roughness of the single fiber can be analyzed in accordance with the KS M ISO 9184-6:1994 test standard.

[0066] According to some embodiments of the present invention, by satisfying the organic combination relationship between the above-mentioned range of the degree of freedom and the average roughness range of the single fiber, a cigarette filter having uniform perforations and a regular cross-sectional shape can be realized when the paper sheet is crimped. Accordingly, the present invention can realize a smoking article with excellent external appearance, thereby conveying a clean image to the user.

[0067] According to some embodiments of the present invention, the papermaking machine in step (S3) may be a typical papermaking machine or paper machine commercially available in the relevant technical field. When raw fibers subjected to steps (S1) and (S2) are used, the paper sheet can exhibit excellent cross-sectional aesthetics when crimped.

[0068] According to some embodiments of the present invention, the content of the single fiber may be 70 wt% or more based on the total weight of the paper sheet, and specifically, may be 70 to 100 wt%, 70 to 99 wt%, 72 to 90 wt%, 73 to 86 wt%, 74 to 84 wt%, 75 to 83 wt%, 76 to 82 wt%, 77 to 81 wt%, or 78 to 80 wt%. According to some embodiments of the present invention, since the content of the single fiber satisfies the numerical range, the manufacturing workability of the paper sheet can be improved, and when the paper sheet is crimped, a cigarette filter having uniform holes and a regular cross-sectional shape can be implemented.

[0069] As described above, the mixed fiber according to the present invention includes sub-pulp fibers and regenerated fibers.

[0070] Specifically, the sub-pulp fiber may be a pulp fiber derived from wood or vegetation. For example, the wood or vegetation is not particularly limited and may be a raw material for manufacturing paper sheets in the relevant technical field. Specifically, the wood may be an evergreen, broad-leaved tree, coniferous tree, etc., and the vegetation may be bamboo, hemp, flax, etc. More specifically, the wood may include one or more of southern pine, mixed softwood, Cedrus, hardwood, and softwood. However, the technical idea of ​​the present invention is not limited thereto, and various woods and / or vegetation may be used.

[0071] According to some embodiments of the present invention, the sub-pulp fibers may include pulp fibers derived from evergreen trees. Specifically, by mixing sub-pulp fibers derived from evergreen trees with regenerated fibers, a cigarette filter having uniform pores and a regular cross-sectional shape can be realized when the paper sheet is crimped. For example, the evergreen tree may be southern pine, and the regenerated fibers may include at least one of rayon and lyocell, and specifically, rayon. Here, when the regenerated fibers are rayon, the bulk of the paper sheet can be adjusted to an appropriate level, thereby further improving the appearance of the cigarette filter.

[0072] According to some embodiments of the present invention, the weight ratio of the sub-pulp fibers and the regenerated fibers (sub-pulp fibers: regenerated fibers) may be 9:1 to 5:5, specifically 8:2 to 6:4, and more specifically 8:2 to 7:3. According to some embodiments of the present invention, when the weight ratio of the sub-pulp fibers and the regenerated fibers satisfies the above numerical range, a cigarette filter having uniform holes and a regular cross-sectional shape when the paper sheet is crimped can be implemented.

[0073] According to some embodiments of the present invention, the average length of the pulp fibers may be 2 to 6 mm, 3 to 5 mm, or 4 to 5 mm. Specifically, by satisfying the average length of the pulp fibers within the above numerical range, the contact between the fibers in the fiber suspension during the manufacturing process of the paper sheet can be adjusted to an appropriate level, thereby changing the degree of freedom. Accordingly, the bulk and porosity of the paper sheet can also be affected, and accordingly, the appearance of the paper sheet can be changed when applied to a filter in a crimped state.

[0074] Meanwhile, the basis weight of a paper sheet is the weight per unit area of ​​the paper sheet (g / m). 2=gsm), which can affect the bulk value of the paper sheet and thus the appearance of the paper sheet when it is crimped.

[0075] According to some embodiments of the present invention, the basis weight of the paper sheet is 20 gsm or more, 21 gsm or more, 22 gsm or more, 23 gsm or more, 24 gsm or more, 25 gsm or more, 26 gsm or more, 27 gsm or more, 28 gsm or more, 29 gsm or more, 30 gsm or more, 31 gsm or more, 32 gsm or more, 33 gsm or more, 34 gsm or more, 35 gsm or more, 36 gsm or more, 37 gsm or more, 38 gsm or more, 39 gsm or more, 40 gsm or more, 41 gsm or more, 42 gsm or more, 43 gsm or more, 44 gsm or more, 45 gsm or more, 46 gsm or more, 47 gsm or more, 48 gsm or more, 49 gsm or more, 50 gsm or more, 51 gsm or more, 52 gsm or more, 53 gsm or more, 54 gsm or more, 55 gsm or more, 56 gsm or more, 57 gsm or more, 58 gsm or more, or 59 gsm or more; 60 gsm or less, 59 gsm or less, 58 gsm or less, 57 gsm or less, 56 gsm or less, 55 gsm or less, 54 gsm or less, 53 gsm or less, 52 gsm or less, 51 gsm or less, 50 gsm or less, 49 gsm or less, 48 ​​gsm or less, 47 gsm or less, 46 gsm or less, 45 gsm or less, 44 gsm or less, 43 gsm or less, 42 gsm or less, 41 gsm or less, 40 gsm or less, 39 gsm or less, 38 gsm or less, 37 gsm or less, 36 gsm or less, 35 gsm or less, 34 gsm or less, 33 gsm or less, 32 gsm or less, 31 gsm or less, 30 gsm or less, 29 gsm or less, 28 gsm or less, 27 gsm or less, 26 gsm or less, 25 gsm or less, 24 gsm or less, 23 gsm or less, 22 gsm or less, or 21 gsm or less; or any range of values ​​having any one of the plurality of lower limit values ​​and any one of the plurality of upper limit values ​​as the lower limit value and the upper limit value, respectively;It can be. Specifically, the basis weight of the paper sheet can be 20 to 60 gsm, 25 to 55 gsm, 30 to 50 gsm, or 35 to 45 gsm. According to some embodiments of the present invention, when the basis weight of the paper sheet satisfies the numerical range, the bulk properties of the paper sheet are effectively controlled, thereby improving the appearance of the cigarette filter.;

[0076] According to some embodiments of the present invention, the thickness of the paper sheet may be 50 to 150 μm, 60 to 140 μm, 70 to 130 μm, 80 to 120 μm, 90 to 110 μm, or 100 to 110 μm. If the thickness of the paper sheet is less than the above numerical range, the achievable level of suction resistance may become too low or problems may occur during the manufacturing process due to tearing of the paper sheet, and if the thickness of the paper sheet exceeds the above numerical range, a bursting phenomenon may occur during the manufacturing process of the filter or a suction resistance so high that the suckability of the smoking article may be impaired. In addition, if the thickness of the paper sheet is outside the above numerical range, problems such as single yarn or circumference defects of the paper may occur during the manufacturing of a cigarette filter.

[0077] According to some embodiments of the present invention, the air permeability of the paper sheet may be 500 to 10,000 CU, 600 to 9,000 CU, 700 to 8,000 CU, 800 to 7,000 CU, 900 to 6,000 CU, 900 to 5,000 CU, 900 to 4,000 CU, or 925 to 3,950 CU in accordance with ISO 2965. According to some embodiments of the present invention, when the air permeability of the paper sheet satisfies the numerical range, an appropriate level of filtration performance is satisfied, and at the same time, when the paper sheet is crimped, a cross-section having uniform holes is formed, thereby improving the appearance of the filter.

[0078] According to some embodiments of the present invention, a moisturizer may be applied to at least a portion of the surface of the paper sheet to achieve a desired level of pressure drop. Here, the pressure drop may refer to the resistance of air felt by a user when biting a smoking article and inhaling air. Since the satisfaction felt by the user while smoking may vary depending on the pressure drop, there is a need to achieve a target pressure drop. For example, the moisturizer may include at least one of glycerin, guar gum, starch, methyl cellulose, ethylene vinyl acetate (EVA), gum arabic, and propylene glycol. For example, the content of the moisturizer applied to at least a portion of the surface of the paper sheet may be 0.5 mg / mm to 5 mg / mm.

[0079] According to some embodiments of the present invention, the cigarette filter may further include granules to enhance the bonding strength between the moisturizer and the paper sheet. Specifically, the granules are introduced and placed on the surface of the paper sheet, thereby enhancing the bonding strength between the moisturizer and the paper sheet. For example, the granules may include a coating layer formed on their surface to prevent them from breaking or shattering due to external impact. In one example, the coating layer comprises microcrystalline cellulose, anhydrous lactose, Cellactose 80 (co-processed 75% microcrystalline cellulose and 25% lactose), Isomalt, dibasic dihydrate calcium phosphate, calcium carbonate, calcium lactate, dibasic anhydrous calcium phosphate, tribasic calcium phosphate, calcium silicate, calcium sulfate, carbomer, calcium carboxymethylcellulose, sodium carboxymethylcellulose, cellulose, silicified microcrystalline cellulose, cellulose acetate, ceratonia, Copovidone, Corn starch, Pregelatinized starch, Dextrate, Dextrin, Dextrose, Erythritol, Ethylcellulose, Fructose, Fumaric acid, Glyceryl monooleate, Glyceryl monostearate, Glyceryl palmitostearate, Hydroxyethyl cellulose, Hydroxyethylmethyl cellulose, Hydroxypropyl betadexHydroxypropyl cellulose, hydroxypropyl starch, hypromellose, hypromellose acetate succinate, kaolin, lactitol, anhydrous lactose, lactose monohydrate, magnesium carbonate, magnesium oxide, maltitol, maltodextrin, maltose, mannitol, methylcellulose, polaxamer, polycarbophil, polydextrose, poly(DL-lactic acid), polyethylene glycol, polyethylene oxide, polymethacrylate, polyoxyglyceride, polyvinyl alcohol, povidone, shellac, simethicone, sodium alginate, sodium chloride, sorbitol, starch, sucrose, sugar spheres, sulfobutyl ether B-cyclodextrin, It may include at least one of titanium dioxide, trehalose, microcrystalline wax, white wax, yellow wax, xanthan gum, xylitol, beeswax, candelilla, carnauba, caraway, sugarcane wax, myrtle wax, gum arabic, locust bean wax, guar gum, alginate, carrageenan and pectin.

[0080] According to some embodiments of the present invention, the paper sheet is formed by rolling into a cylindrical shape, and may have a circumference of 20 to 25 mm. For example, the paper sheet may be formed by rolling paper crimped by crimping the paper base, or may be manufactured by rolling the paper base so that it becomes a cylindrical shape when rolled. In this case, the circumference of the paper sheet may be the circumference of the bottom surface after being rolled into a cylindrical shape.

[0081] According to some embodiments of the present invention, the void area ratio with respect to the cross-section of the cigarette filter may be 19% or less, 18% or less, 17% or less, 16% or less, 15% or less, 14% or less, 13% or less, 12% or less, 11% or less, 10% or less, 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, or 4.3% or less. According to some embodiments of the present invention, since the void area ratio of the cigarette filter satisfies the numerical range, when the paper sheet is crimped, a cigarette filter having uniform holes and a regular cross-section shape can be implemented. Accordingly, the present invention can implement a smoking article having excellent appearance and can implement an effect of conveying a clean image to the user. For example, the void area ratio for the cross-section of the cigarette filter is the ratio of the area of ​​the void space not occupied by the paper sheet when the total area of ​​the filter cross-section is 100, and can be calculated by taking a surface image, shading the void space, and measuring the ratio of the white color area (paper) and the black color area (void).

[0082] 2. Smoking items

[0083] According to another aspect of the present invention, a smoking article is provided, comprising: a first part comprising a medium; and a second part comprising a filter element; wherein the filter element comprises a cigarette filter according to some embodiments of the present invention. According to some embodiments of the present invention, a smoking article having excellent appearance and excellent biodegradability can be realized by including a cigarette filter (crimped paper sheet) in the filter element.

[0084] Figure 3 is a perspective view showing a smoking article according to one embodiment of the present invention.

[0085] Referring to FIG. 3, the first smoking article (200a) according to the present invention may be, for example, a combustion-type cigarette as an example of a smoking article (200).

[0086] A first smoking article (200a) according to the present invention includes a first portion (210) and a second portion (220). The first smoking article (200a) may further include a wrapper (250). Specifically, the first portion (210) and the second portion (220) may be arranged sequentially along the longitudinal direction of the first smoking article (200a). More specifically, the first portion (210) may be arranged upstream of the second portion (220). In this case, the wrapper (250) may wrap at least one of the first portion (210) and the second portion (220), and specifically, may wrap a portion of the first portion (210) and the entire second portion (220). For example, the first and second portions (210, 220) may have a cylindrical shape.

[0087] The first portion (210) according to the present invention comprises a medium capable of generating smoke and / or aerosol upon combustion. Specifically, the mainstream smoke generated upon combustion of the first portion (210) can be inhaled by the user through the second portion (220), which will be described later, from the first portion (210) in the longitudinal direction of the first smoking article (200a).

[0088] For example, the medium is not particularly limited and may be any material capable of generating common smoke and / or aerosols commonly used in the relevant technical field. Specifically, the medium may include tobacco raw materials such as tobacco leaf pieces, tobacco stems, etc., and materials processed therefrom. As more specific examples, the medium may include ground tobacco leaves, expanded stems, tobacco cut fillers (e.g., leaf tobacco cut fillers, flat leaf cut fillers), tobacco sheets (e.g., flat leaf), etc.

[0089] According to some embodiments of the present invention, the medium may further include one or more additives selected from the group consisting of a humectant and a flavoring agent. For example, the humectant may maintain an appropriate level of moisture within the medium to soften the inherent taste and enrich the amount of atomization. Specifically, the humectant may include at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. For example, the flavoring agent may be added to enhance the flavor. Specifically, the flavoring agent may include licorice, sucrose, fructose syrup, isosweetener, cocoa, lavender, cinnamon, cardamom, celery, fenugreek, cascarilla, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, mint oil, caraway, cognac, jasmine, chamomile, menthol, ylang-ylang, sage, spearmint, ginger, coriander, clove extract (or clove material), or coffee.

[0090] The second part (220) according to the present invention may be a filter part that performs a filtering function for smoke and / or aerosol generated from the first part (210). Specifically, the second part (220) may be located downstream of the first part (210) and connected to the downstream end of the first part (210).

[0091] The second portion (220) according to the present invention includes a filter element to perform the above-described filtration function. Specifically, the filter element may include a cigarette filter according to some embodiments of the present invention, and may specifically include a crimped paper sheet (100).

[0092] The wrapper (250) according to the present invention may be arranged on the surface of a paper sheet (100) in a cylindrical shape, and specifically, may surround the paper sheet (100). More specifically, the wrapper (250) may be a filter paper or a tipping paper. For example, when the wrapper (250) is a filter paper, it may surround the paper sheet (100), and when the wrapper is a tipping paper, it may surround the filter paper. For example, the wrapper (250) may include cellulose or dextrin.

[0093] Figure 4 is a perspective view illustrating a smoking article according to another embodiment of the present invention. Any description that overlaps with the above description will be briefly explained or omitted.

[0094] Referring to FIG. 4, the second smoking article (200b) according to the present invention may be another embodiment of the smoking article (200), for example, a combustion-type cigarette.

[0095] The second smoking article (200b) according to the present invention may further include a third part (230) interposed between the first part (210) and the second part (220). Specifically, the third part (230) may be arranged on one side of the first part (210) and on one side of the second part (220). More specifically, the second smoking article (200b) according to the present invention may be arranged sequentially in the order of the first part (210), the third part (230), and the second part (220) along the longitudinal direction.

[0096] According to one embodiment of the present invention, the third portion (230) can cool the airflow passing through the first portion (210) from the outside of the second smoking article (200b). Specifically, the third portion (230) can include a first cooling element.

[0097] According to one embodiment of the present invention, the first cooling element may be a cylindrical tube formed of paper material and including a hollow portion. Specifically, the inner surface of the tube may be coated with polylactic acid. According to some embodiments of the present invention, by coating the inner surface of the tube with polylactic acid, the mainstream tobacco smoke and / or aerosol generated by ignition of the first portion (210) can be more effectively cooled.

[0098] According to another embodiment of the present invention, the first cooling element may be formed of a biodegradable polymer material, and specifically may be formed of polylactic acid fiber.

[0099] According to another embodiment of the present invention, the first cooling element may be a cellulose acetate filter.

[0100] The wrapper (250) according to the present invention can surround at least one of the first to third parts (210, 220, 230).

[0101] Figure 5 is a perspective view illustrating a smoking article according to another embodiment of the present invention. Any description that overlaps with the above description will be briefly explained or omitted.

[0102] Referring to FIG. 5, the third smoking article (200c) according to the present invention is another embodiment of the smoking article (200), and may be, for example, a heated cigarette. Specifically, the third smoking article (200c) may be a heated cigarette that is heated by an aerosol generating device, described later, through an external or internal heating method.

[0103] The third smoking article (200c) according to the present invention may further include a fourth part (240) arranged on one side of the first part (210). Specifically, the fourth part (240), the first part (210), the third part (230), and the second part (220) may be arranged in a parallel order along the longitudinal direction of the third smoking article (200c). That is, the first part (210) may be interposed between the third part (230) and the fourth part (240), and the third part (230) may be interposed between the first part (210) and the second part (220).

[0104] The third smoking article (200c) according to the present invention may include a wrapper (250) that wraps at least one of the first to fourth parts (210, 220, 230, 240) described above.

[0105] According to one embodiment of the present invention, the fourth portion (240) may be a substrate for generating an aerosol. Specifically, the fourth portion (240) may include an aerosol-generating material. For example, the aerosol-generating material may include at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol.

[0106] According to another embodiment of the present invention, at least one of the second portion (220) and the fourth portion (240) may include a paper sheet according to some embodiments. Specifically, by including a paper sheet according to some embodiments of the present invention in at least one of the second portion (220) and the fourth portion (240), the appearance of a smoking article filled with the paper sheet in a crimped state may be improved, and biodegradability may be improved at the same time.

[0107] According to another embodiment of the present invention, one of the second portion (220) and the fourth portion (240) may include the paper sheet, and the other may include a cellulose acetate filter, and specifically, the second portion (220) may include the paper sheet. According to some embodiments of the present invention, a smoking article may be provided that has uniform holes and a regular cross-sectional shape when the crimped paper filter is filled by including the paper sheet in the second portion, which is a curved portion. Accordingly, the appearance of the filter is improved, and a clean image can be conveyed to the user.

[0108] According to another embodiment of the present invention, the second portion (220) and the fourth portion (240) may include the paper sheet. Specifically, by including the paper sheet according to some embodiments of the present invention in the second portion (220) and the fourth portion (240), the appearance of a smoking article filled with the paper sheet in a crimped state can be improved, and at the same time, a smoking article with high biodegradability can be provided.

[0109] According to some embodiments of the present invention, the paper sheet of the fourth portion (240) may be impregnated with the aerosol-generating substance described above. According to some embodiments of the present invention, by including the paper sheet impregnated with the aerosol-generating substance in the fourth portion (240), the impregnation rate of the aerosol-generating substance in the paper sheet is further increased, thereby enabling better implementation of the atomization function.

[0110] According to another embodiment of the present invention, the fourth portion (240) may include a second cooling element for cooling the vapor supplied from the liquid cartridge. In this case, the second portion (220) may include a paper sheet according to some embodiments of the present invention. For example, the second cooling element may be the same as or different from the first cooling element. Specifically, the second cooling element may be a cylindrical tube formed of a paper material and including a hollow portion. According to another embodiment of the present invention, the inner surface of the tube may be coated with polylactic acid. By coating the inner surface of the tube with polylactic acid, the vapor supplied from the liquid cartridge can be cooled more effectively.

[0111] A third part (230) according to another embodiment of the present invention may include a tube filter. The tube filter may be a hollow cellulose acetate filter through which the atomizer moves.

[0112] Figure 6 is an aerosol generating device to which a smoking article according to one embodiment of the present invention can be applied.

[0113] An aerosol generating device (300) according to one embodiment of the present invention may be a first aerosol generating device (300a).

[0114] Referring to FIG. 6, a first aerosol generating device (300a) according to an embodiment of the present invention may include a housing (not shown), a heater (330), a control unit (320), and a battery (310). For example, the first aerosol generating device (300a) may further include other general or typical components in addition to the illustrated components. Specifically, the first aerosol generating device (300a) may further include an output module (e.g., motor, display) for outputting the status of the device and / or an input module (e.g., button) for receiving a user's input (e.g., device on / off, etc.).

[0115] The housing according to the present invention can form the exterior of the first aerosol generating device (300a) and can form a receiving space for receiving the third smoking article (200c) according to some embodiments of the present invention.

[0116] The heater (330) according to the present invention can generate smoke and / or aerosol by heating a third smoking article (200c) accommodated in the accommodation space. The third smoking article (200c) according to some embodiments of the present invention accommodated in the accommodation space can generate smoke and / or aerosol as it is heated by the heater. The generated smoke and / or aerosol can be inhaled through the user's mouth (ME).

[0117] In Fig. 6, the heater (330) is illustrated as being implemented as an internal heating type, but this is for convenience of understanding and may be modified to an external heating type. For example, the heater (330) may be implemented as an electric resistance heater or an induction heating type.

[0118] The control unit (320) according to the present invention can control the overall operation of the first aerosol generating device (300a). For example, the control unit (320) can control the operation of the heater (330) and the battery (310), and can also control the operation of other components included in the first aerosol generating device (300a). Specifically, the control unit (320) can control the power supplied by the battery (310), the heating temperature of the heater (330), etc. In addition, the control unit (320) can check the status of each component of the first aerosol generating device (300a) to determine whether the first aerosol generating device (300a) is in an operable state.

[0119] The control unit (320) according to the present invention may be implemented by at least one processor. The processor may be implemented by an array of multiple logic gates, or may be implemented by a combination of a general-purpose microprocessor and a memory storing a program executable by the microprocessor.

[0120] The battery (310) according to the present invention can supply power used for the operation of the first aerosol generating device (300a). For example, the battery (310) can supply power to the heater (330) and power required for the operation of the control unit (320). In addition, the battery (310) can supply power required for the operation of electrical components such as a display, sensor, and motor installed in the first aerosol generating device (300a).

[0121] Figure 7 is an aerosol generating device to which a smoking article according to another embodiment of the present invention can be applied.

[0122] Referring to FIG. 7, an aerosol generating device (300) according to another embodiment of the present invention may be a second aerosol generating device (300b).

[0123] The second aerosol generating device (300b) according to the present invention may further include a vaporizer (340).

[0124] The vaporizer (340) according to the present invention can generate an aerosol by vaporizing a liquid aerosol-forming substrate. For example, the vaporizer (340) may include a liquid storage tank for storing a liquid aerosol-forming substrate, a wick for absorbing the stored liquid, and a liquid vaporization element for vaporizing the absorbed liquid. In this case, the liquid vaporization element may be implemented as a heating element, a vibration element for vaporizing the liquid through ultrasonic vibration, or may be implemented in another form. As another example, the vaporizer (340) may not include a wick. The liquid vaporization element of the vaporizer (340) may be controlled by a control unit (320).

[0125] The aerosol generated from the vaporizer (340) can pass through the third smoking article (200c) and be inhaled through the user's mouth.

[0126] The heater (330) according to the present invention can be placed at an appropriate location to implement an external heating method.

[0127] Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, this is merely an example, and the scope of the present invention is not limited by the following contents.

[0128] [Experimental Example 1: Evaluation of the Appearance of Cigarette Filters According to the Control of the Water Content and Illumination Intensity]

[0129] Raw fibers of various origins were dissociated and refined. During the refining process, the freeness of the raw fibers was adjusted to the values ​​shown in Table 1 below. The dissociated and refined raw fibers were dried using a conventional drying process and then manufactured into paper sheets using a paper machine. Then, cigarette filters were manufactured using filter paper wrapped around the paper sheets.

[0130] The sensory evaluation was conducted using the Difference Identification Test-Characteristic Difference Test-Ranking Method and the Rating Method, and 13 sensory panelists used a 5-point scale to evaluate the superiority of the cross-sectional attractiveness of cigarette filters. Specifically, an average score for filter attractiveness of 4 to 5 points was evaluated as "very good," 3 to 4 points as "good," 2 to 3 points as "average," and 2 points or less as "poor."

[0131] Classification Fiber Raw Material Fiber Average Roughness (mg / 100m) Yeosudo (˚SR) Paper Sheet Bulk 1) (cm 3 / g)Porosity (CU)Filter FinenessExample 1Single fiber Southern Pine 2813.52.613,9504Example 2Single fiber Mixed softwood 1813.52.539254Example 3Single fiber Cedar 1413.52.285223Example 4Single fiber Southern Pine 2815.52.141,8403Comparative Example 1Single fiber Southern Pine 2820.01.857601Comparative Example 2Mixed fiber Hardwood 50wt% + Softwood 50wt% 1128.51.5537511) Bulk of paper sheet = (Thickness of paper sheet / Basis weight of paper sheet)

[0132] Referring to Table 1 above, it can be confirmed that the average roughness of a single fiber varies depending on the origin of the pulp fiber. Both the origin of the pulp fiber and the degree of refining (the degree of refining) can influence the achievement of superior bulk performance in paper sheets. The experimental results above demonstrate that simultaneously controlling the degree of refining and the average roughness of a single fiber during the paper sheet manufacturing process can alter the aesthetic appeal of the cross-section of the filter.

[0133] Specifically, when the average coarseness of a single fiber is the same, Comparative Example 1 and Example 1 are compared from the viewpoint of the freeness, even if the average coarseness of a single fiber satisfies 13 mg / 100 m or more, the freeness becomes higher than 20˚SR, so that the bulk of the paper sheet is 2 to 4 cm. 3 It can be confirmed that / g is not satisfied. Through this, it can be confirmed that in the case of Comparative Example 1, the aesthetic performance is deteriorated due to irregular or uneven holes between the paper folds when the paper sheet is crimped. On the other hand, in the case of Example 1, it can be confirmed that the aesthetic performance of the cross-section of the filter is significantly improved as the average roughness of the single fiber satisfies 13mg / 100m or more and the freeness is controlled to less than 20˚SR.

[0134] In the case of Comparative Example 2, since the average roughness of a single fiber is less than 13 mg / 100 m and the water content is adjusted high, the bulk and porosity of the paper sheet are significantly reduced, which may significantly deteriorate the filter aesthetic performance.

[0135] On the other hand, examples 1 to 4 have a bulk of paper sheets of 2 to 4 cm. 3 / g and the average coarseness of a single fiber is 13mg / 100m or more, it can be confirmed that the cross-section appearance performance of the filter is improved. Here, the bulk of the paper sheet may vary depending on the water content.

[0136] When comparing Examples 1 to 3 in terms of filter aesthetics according to the average roughness of a single fiber under identical conditions of the water content, it can be confirmed that as the average roughness of a single fiber increases, the bulk of the paper sheet and the porosity of the paper sheet also increase. In light of this tendency, it can be confirmed that the filter aesthetics are further improved when the average roughness of a single fiber is 18 to 28 mg / 100 m.

[0137] [Experimental Example 2: Cross-sectional cavity area ratio of cigarette filters]

[0138] Figure 8 shows the cavity area ratio of the cross-section of a cigarette filter according to Example 1. Figure 9 shows the cavity area ratio of the cross-section of a cigarette filter according to Comparative Example 1. The cavity area of ​​the cross-section of the cigarette filter was analyzed. Here, the cavity is indicated in black.

[0139] Referring to FIGS. 8 and 9, it can be confirmed that the cross-sectional void area ratio of the cigarette filter according to Example 1 is 4.3%, and the cross-sectional void area ratio of the cigarette filter according to Comparative Example 1 is 19.9%. Through this, it can be inferred that a filter with excellent appearance can be implemented by lowering the cross-sectional void area ratio of the cigarette filter.

[0140] [Experimental Example 3: Reference data demonstrating the particle removal ability of paper sheets compared to CA filters]

[0141] 1) A step of measuring the amount of smoke components transferred from a cigarette without a cigarette filter; 2) A step of measuring the amount of smoke components transferred from a cigarette with a cigarette filter attached under the same conditions; 3) A step of calculating the smoke components removed from the filter, which is the difference between the amount of smoke components transferred in 1) and the amount of smoke components transferred in 2); and 4) A step of calculating the removal ability by calculating the ratio of 3) to 1); The removal ability was derived through these steps.

[0142] Cellulose acetate tow filter (CA-Tow) Paper sheet filter (Example 1) Particulate matter (TPM) Removal ability (%) 62.28 2.3 Migration amount (mg / cig.) 12.4 5.8 Tar (Tar.) Removal ability (%) 56.27 9.5 Migration amount (mg / cig.) 9.7 4.5 Nicotine (Nic.) Removal ability (%) 44.27 5.5 Migration amount (mg / cig.) 0.8 2 0.36 Smoking conditions: Puff volume_35㎖, Duration_2sec, Interval_60sec, Non-ventilation

[0143] Referring to Table 2 above, it can be confirmed that the paper sheet has a significantly higher removal ability for particulate matter, tar, and nicotine than the cellulose acetate tow filter.

[0144] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0145] [Explanation of symbols]

[0146] 10a: Pulp fiber 100: Paper sheet

[0147] 200: Smoking Articles 200a: Smoking Articles 1

[0148] 200b: Second smoking item 200c: Third smoking item

[0149] 210: Part 1 220: Part 2

[0150] 230: Part 3 240: Part 4

[0151] 250: Wrapper 300: Aerosol generator

[0152] 300a: First aerosol generating device

[0153] 300b: Second aerosol generating device

[0154] 310: Battery 320: Control Unit

[0155] 330: Heater 340: Vaporizer

Claims

1. A cigarette filter comprising a paper sheet containing pulp fibers; The bulk of the above paper sheet is 2 to 4 cm 3 / g and, The above pulp fibers: A single fiber having an average coarseness of 13 mg / 100 m or more; and Mixed fibers comprising sub-pulp fibers and regenerated fibers; at least one of Filter for cigarettes.

2. In paragraph 1, The content of the single fiber is 70 wt% or more based on the total weight of the paper sheet, Filter for cigarettes.

3. In paragraph 1, The above sub-pulp fibers include pulp fibers derived from evergreen trees. Filter for cigarettes.

4. In paragraph 1, The weight ratio of the above sub-pulp fiber and the above regenerated fiber is 9:1 to 5:5, Filter for cigarettes.

5. In paragraph 1, The average length of the pulp fibers is 2 to 6 mm, Filter for cigarettes.

6. In paragraph 1, The porosity of the above paper sheet is 500 to 10,000 CU. Filter for cigarettes.

7. A first part comprising a medium; and a second part comprising a filter element; The above filter element is, Comprising a cigarette filter according to Article 1, Smoking items.

8. In paragraph 7, Further comprising a third part interposed between the first part and the second part; The third part above, including a first cooling element or tube filter, Smoking items.

9. In paragraph 8, Further comprising a fourth part arranged on one side of the first part; At least one of the second part and the fourth part comprises the paper sheet. Smoking items.

10. In paragraph 9, The second part includes the paper sheet, Smoking items.

11. In paragraph 9, The second part and the fourth part include the paper sheet, Smoking items.

12. In paragraph 9, The fourth part includes a second cooling element, Smoking items.

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