TW201542107A - Filter for tobacco product and tobacco products - Google Patents

Abstract

An objective of this invention is to provide a filter for tobacco product capable of ensuring the inlet of outer gas during smoking and the decrease of the leakage of smoke. The filter for tobacco product is formed by porous material and comprises a tube-like product whose inside is hollow, and the tube-like product has a non-through hole with specific air permeability.

Description

Filters and tobacco products for tobacco products

The present invention relates to filters and tobacco products for use in tobacco products.

Conventionally, there has been proposed a smoking article which extends through the filter paper and the tubular filter segment and has a row of perforations (for example, Patent Document 1). Further, a smoking article is proposed which includes a vent hole through a tubular section opened at the downstream end (for example, Patent Document 2). Further, a smoking article is proposed which is a row including perforations in which a predetermined ventilation zone of the filter segment extends through the filter paper (for example, Patent Document 3). The above-mentioned perforations (vent holes) are combined with a member for restricting the aeration flow rate, for example, to exert an external air introduction during smoking.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 2010-508864

[Patent Document 2] Japanese Patent Publication No. 2010-520753

[Patent Document 3] Japanese Patent Publication No. 2009-542250

In the past, there has been proposed a method of diluting mainstream smoke by providing a vent hole in a filter portion of a smoking article (especially a cylindrical portion having a void inside) to introduce an external air. Here, the inventors of the present application focused on the point where the mainstream smoke inside the filter leaked from the vent hole, for example, in a state of no smoking. Then, at this time, there is a problem that the composition and the smoking taste are deviated from the designed quality, and it is found that the appearance is not satisfactory. The present invention has been made in view of the above problems, and an object thereof is to provide a filter for a tobacco product which ensures external gas introduction performance at the time of smoking and reduces smoke leakage.

A filter for a tobacco product according to an aspect of the present invention is formed of a porous material and includes a cylindrical body having a hollow inside, and the cylindrical body is provided with a predetermined air permeability (in other words, a predetermined ventilation resistance or The predetermined ventilation rate is not a through hole.

The non-through-hole system prevents smoke from leaking from the cavity, and can introduce outside air into the cavity when smoking the tobacco product. In this way, it is possible to provide a filter for a tobacco product which ensures the gas introduction performance at the time of smoking and reduces smoke leakage.

Further, the filter has a resistance portion for restricting the amount of ventilation inside the cylindrical body, and the non-through hole may be located closer to the suction port side of the tobacco product than the resistance portion. In this way, when sucking from the suction side, the inflow of the gas from the tobacco side is restricted by the resistance portion, and becomes easy The outside air is introduced from the non-through hole.

Further, the resistance portion partitions the void into the tobacco side and the suction side of the tobacco product, and may also have a through hole in the wall. In particular, such an orifice configuration can be employed.

Further, the tubular body having the resistance portion may be formed by compression molding of cellulose acetate plugs. Specifically, the cylindrical body of the present invention can be produced by such a method.

Further, the shape of the cavity inside the cylindrical body may be a conical shape or a conical ladder shape including a longitudinal direction of the tobacco product as a height direction. Specifically, a cylindrical body of such a shape can be employed.

Further, the cylindrical body may be provided such that the cellulose acetate plug is further connected to both ends in the longitudinal direction of the tobacco product. In this way, the tobacco yarn (also referred to simply as "cut tobacco") can be prevented from entering the cavity from the tobacco side, and the smoke can be prevented from leaking toward the suction side when not being sucked. Further, the cellulose acetate plug on the suction side functions as a part of the user contained in the mouth, and the non-through hole provided in the cylindrical body can be prevented from being plugged by the lip. Further, when the cellulose acetate plug is connected to both ends in the longitudinal direction of the cylindrical body, in order to reduce the degree of filtration of the mainstream smoke, the vaporization resistance of the cellulose acetate plug at both ends is preferably lower. Further, in order to improve the introduction performance of the external air during smoking, the ventilation resistance of the cellulose acetate plug on the tobacco side is preferably higher than the ventilation resistance of the cellulose acetate plug on the suction side. Further, the cellulose acetate plug may be connected to at least the tobacco side of the cylindrical body.

In addition, the tobacco product of other aspects of the present invention has: a filter as described above; a cigarette disposed in the filter and containing tobacco a grass stick; and a paper material that winds the filter and the tobacco rod. Further, the paper material has an opening at a position overlapping the non-through hole. In this way, it is possible to provide a tobacco product which ensures the gas introduction performance at the time of smoking and reduces smoke leakage.

Further, the means for solving the problems of the present invention may be combined as far as possible.

According to the present invention, it is possible to provide a filter for a tobacco product which ensures external gas introduction performance at the time of smoking and which reduces smoke leakage.

1‧‧ ‧ Cigarettes

3‧‧‧Acetate filter plug

11‧‧‧Tobacco stick

12‧‧‧ Filter section

13‧‧‧ Filter paper

121‧‧‧Ventilator

122‧‧‧(1) filter segment

123‧‧‧Formed segments

124‧‧‧(2) filter segment

125‧‧‧ Winding paper

126‧‧‧Void section (cavity)

201‧‧‧Cylinder parts

202, 203‧‧‧ forming head

1231‧‧‧(1) cylindrical part

1232‧‧‧Resistance

1233‧‧‧(2nd) cylindrical part

Fig. 1 is a perspective view showing an example of a cigarette.

Fig. 2 is a perspective view showing an example of a filter portion.

Fig. 3 is a longitudinal sectional view showing an example of a filter portion.

4(S1) to (S5) are schematic perspective views showing an example of a method of manufacturing a cigarette.

(S11) to (S14) are schematic cross-sectional views showing an example of a manufacturing method used for a molded body segment and a jig for manufacturing.

Figure 6 is a cross-sectional view showing the cigarette of the embodiment.

Fig. 7 is a sectional view for explaining a molded body section of the cigarette of the embodiment.

Fig. 8 is an example of a cross-sectional view of a cigarette cut along a row of ventilation holes.

Fig. 9 is an example of a cross-sectional view of a cigarette cut along a row of ventilation holes.

Fig. 10 is a cross-sectional view for explaining the measurement of the ventilation resistance and the ventilation rate of the cigarette.

Figure 11 is a table showing the specifications of cigarettes.

Fig. 12 is a table showing the specifications of the formed body section.

Figure 13 is a cross-sectional view showing the cigarettes of the first to third comparative examples.

Fig. 14 is a table showing the specifications of the cigarettes of the first to third comparative examples.

Fig. 15 is a table showing specifications of the filter portions of the fourth to sixth comparative examples.

Fig. 16 is a table showing the specifications of the filter portions of the seventh and eighth comparative examples.

The embodiment of the cigarette of the present invention will be described with reference to the drawings. In addition, the configuration of the cigarette shown in the drawings is not limited to the description of the drawings, except for the case where the numerical value is particularly indicated. Further, the cigarette is only an example of a tobacco product, and the embodiment is not limited to a cigarette.

<Composition of cigarettes>

Fig. 1 is a perspective view showing an example of the cigarette of the embodiment. The cigarette 1 is almost cylindrical in shape and includes a tobacco rod 11 and a filter portion 12. The tobacco rod 11 is formed by wrapping tobacco yarn with cigarette paper. The filter portion 12 is formed using a porous material such as a fiber bundle formed of a cellulose acetate plug. In the present embodiment, the filter portion 12 is formed by enclosing a plurality of segments to be described later by using cigarette paper. In addition, the so-called segment refers to the connection set in the incense The unit of the constituent elements of the axial direction of the smoke 1. In addition, the axial direction means the longitudinal direction of the cigarette 1. Further, the filter portion 12 is provided with a ventilation hole 121 along the circumferential direction of the cigarette 1. In addition, the circumferential direction means the direction of the circumference of the cross section in which the cigarette 1 is cut perpendicularly in the axial direction. Next, the tobacco rod 11 and the filter portion 12 are wound with each other by using a filter paper to form the cigarette 1. In the cigarette 1 having almost a cylindrical shape, a curved surface wound by a paper material may also be referred to as a side surface. The size in the longitudinal direction of the length of the cigarette and the size of the cross section corresponding to the thickness of the cigarette are not particularly limited. In addition to ordinary cigarettes, so-called cigarettes of a slim size, an ultra-fine size, a micro-fine size, and the like can be used. For example, the diameter of the cross section may be about 5.0 to 8.5 mm. That is, it may be 7.5 to 8.5 mm in size of a general cigarette, 6.5 to 7.5 mm in a slightly thinner size, or 5.0 to 6.5 mm in a fine size.

Next, the internal structure of the filter portion 12 will be described using Figs. 2 and 3 . Fig. 2 is a perspective view showing an example of the filter portion 12. Fig. 3 is a longitudinal sectional view taken along the axial direction of the cigarette 1 in the center of the filter portion 12. The filter portion 12 includes: a first filter segment (referred to as a "filter segment" or a "filter plug") 122 that is disposed in the tobacco rod 11; a cylindrical shaped body segment 123 having an orifice; and The second filter segment on the suction side (also referred to simply as "filter segment" or "filter plug") 124.

The filter segments 122 and 124 can be formed, for example, from a cylindrical acetate filter. Further, the formed body segment 123 is a cylindrical body having a resistance portion inside. Specifically, the formed body segment 123 is integrally formed by the following members, and the members include: a first cylindrical portion having a void therein (also referred to as "tubular portion") 1231; a wall-shaped resistance portion 1232 having a flow path of mainstream smoke in the vicinity of the center of the cross section; and a second tubular portion having a gap therein (also referred to as "tubular portion" ") 1233. That is, the tubular portions 1231 and 1233 are constituted by a cylindrical portion which is hollow inside. Further, the tubular portion formed separately and the resistance portion may be combined, and when an unintentional gap is formed between the tubular portion and the resistance portion, the ventilation according to the design cannot be obtained, so the cylindrical portion is preferably used. It is integrally formed with the resistance portion. Further, the flow path of the mainstream smoke included in the resistance portion 1232 is almost circular in the example shown in Fig. 2, and the aperture is smaller than the cross section of the gap provided inside the cylindrical portions 1231 and 1233. Further, a tapered shape may be added to the inner walls of the tubular portions 1231 and 1233. That is, the voids inside the formed body segment 123 may also include a conical shape and a conical trapezoid shape that are not cylindrical. Such a molded body segment 123 is provided, for example, for a cylindrical acetate filter, in which a cavity is formed by crushing (crushing) the vicinity of the center of the two bottom faces in the height direction, and the flow of the mainstream smoke is performed at the resistance portion 1232. The road is formed by perforation. Further, on the side surface of the second tubular portion 1233, a plurality of ventilation holes (also referred to as "non-through holes") 121 that are not penetrating through the recesses are provided along the outer circumference of the tubular portion. The ventilation hole 121 is, for example, perforated after the cigarette 1 is formed, and is provided so as to pass through the winding paper of the filter paper and the filter portion. The position at which the ventilation hole 121 is provided may be set to be closer to the end of the suction port side (downstream side) of the tubular portion than the resistance portion 1232. In this way, when the cellulose acetate filter is crushed to form the formed body segment 123, the gas is a non-through hole, and the density is increased toward the resistance portion 1232. The hole 121 is disposed near the end of the suction port side of the tubular portion having a relatively low ventilation resistance. position.

Here, the flow of the gas at the time of smoking will be described. The point chain line of Fig. 3 schematically represents the flow of gas when the user smokes mainstream smoke. Further, the formed body segment 123 including the second cylindrical portion 1233 is formed of a porous material and has a predetermined air permeability. When the user smokes the cigarette 1, the air gap in the second tubular portion 1233 is first decompressed, and the mainstream smoke flows into the second tubular portion 1233 from the first tubular portion 1231 via the resistance portion 1232. At this time, since the resistance portion 1232 restricts the flow rate of the gas, the external air easily flows into the second cylindrical portion 1233 from the ventilation hole 121 which is higher than the surrounding air permeability (the ventilation resistance is low). In this way, according to the configuration of the resistance body (resistance portion 1232) having the orifice structure between the hollow portions of the tubular portions 1231 and 1233, the introduction performance of the outside air during smoking can be improved (also referred to as "high ventilation"). In addition, if the inside of the second cylindrical portion 1233 having the ventilation hole 121 can be largely depressurized to be lower than the circumference, the amount of gas introduced from the ventilation hole 121 increases. In order to reduce the pressure, not only the hole of the above-described resistance portion 1232 but also the configuration other than the orifice structure may be employed. For example, an additive such as an increase in ventilation resistance may be added to the filter segment 122 on the cut tobacco side, or an equal density of the filter segment 122 on the cut tobacco side may be increased, and the amount of introduction of gas from the upstream side toward the tubular portion 1233 may be increased. reduce. As the additive, for example, a flavor capsule containing a fragrance such as a liquid or a powder may be used. Further, the capsule is preferably larger, and more preferably the diameter of the capsule is 75% or more of the diameter of the filter. Further, the thickness of the cigarette 1 can be made thinner. That is, even if a so-called cigarette having a slim size, an ultra-fine size, or a micro-fine size is used, the inside of the tubular portion 1233 can be further decompressed. In this way, if the second cylindrical portion 1233 is made Further decompression within the chamber improves the gas introduction performance per hole, thereby reducing the number of holes and reducing the manufacturing cost, and also reducing the ease of breaking of the portion in which the hole is provided.

Here, the CO/tar ratio can be effectively reduced compared to the method of filtering the mainstream smoke by using a filter to mix the mainstream smoke with the air for dilution. In addition, the component whose filtration system is reduced becomes selective. For this, the dilution system uniformly reduces all the components, and in this respect, the two are different, and there is also a difference in smoking taste. The filter segment of the present embodiment is configured to have a lower filtration performance, for example, and can be configured to improve the introduction performance of the outside air (low filtration and high ventilation).

Further, as described above, the ventilation hole 121 of the cigarette 1 of the present embodiment is not penetrated. With such a configuration, the phenomenon that the mainstream smoke in the second tubular portion 1233 leaks to the outside of the cigarette 1 through the ventilation hole 121 is reduced, and the appearance is preferable. In other words, the ventilation hole 121 of the cigarette 1 is in a state where the user does not smoke the cigarette 1 (that is, a state in which there is almost no pressure difference between the inside and the outside of the filter portion 12), and the degree of passage of the gas hardly occurs. Ventilation.

Further, a filter segment 124 is connected to the suction side of the molded body section 123 of the cigarette 1. The filter segment 124 suppresses the leakage of smoke from the tubular portion 1233 toward the suction port side, and functions as a suction port (the portion of the user contained in the mouth). In other words, in the present embodiment, the distance between the end portion on the suction port side of the cigarette 1 and the ventilation hole 121 provided around the second tubular portion 1233 is sufficiently ensured, and the user does not need to plug the lip when smoking. Air hole 121.

<Details and Modifications of Configuration>

The ventilation holes 121 may be non-penetrating, and the cross-sectional shape may be various. For example, it may be a circle, a triangle, an oval (diamond, a parallelogram, a trapezoid), a pentagon, a hexagon, a cross, a star, or the like, or a polygonal or a round polygon. Further, a keyhole shape, a flag shape, and other shapes in which the above shapes are combined may be employed. Further, the direction of the depth of the ventilation holes is arbitrary or inconsistent.

Further, the material of the formed body segment 123 is also not particularly limited. For example, plastic materials such as polypropylene, polyethylene, polyethylene terephthalate, resin-based polymer materials, paper materials, cellulose acetate plugs, etc., extruded or compressed cellulosic materials, stainless steel, aluminum, etc., or Use a combination of the above materials.

Further, the filling material of the filter portion is not limited to the cellulose acetate plug. For example, plant fibers such as cotton, hemp, manila hemp, coconut, rush, animal fibers such as wool and cashmere, cellulose-based regenerated fibers such as cellulose, cellulose-based semi-synthetic fibers such as acetic acid, diacetic acid, and triacetic acid, nylon, and poly Synthetic fibers such as ester, propylene, polyethylene, polypropylene, polyacrylonitrile, or paper, or a combination of the above may be used.

In addition, the plasticizer used in the filter portion can also be used in a variety of ways. For example, triethyl citrate, ethyl triethyl citrate, tributyl citrate, dibutyl tartrate, ethyl phthalic acid ethyl hydroxyacetate, methyl phthalic acid can be used. Ethyl hydroxyacetate, triacetin, triethyl phosphate, triphenyl phosphate, tripropionate, or a combination thereof. Further, a plasticizer may not be used.

The type and material of the winding paper used in the filter section can also Use a wide variety of people. It may be a wound paper having a general air permeability or a non-ventilating one. In terms of the material of the wound paper, generally, a paper material formed of vegetable fibers is used, but a sheet of chemical fibers (polymer, polypropylene, polyethylene, nylon, etc.) may be used. A polymer-based sheet may be used, and a metal foil such as an aluminum foil may also be used.

For the filter body, an uncovered filter can also be used. The uncovered filter has a filter material and the filter material is formed into a cylindrical outer skin layer, and the outer skin layer is formed by thermoforming of the filter material. When using a non-covering filter, it is not necessary to use a wrap paper.

In addition, the material of the filter paper is not limited. In addition to a paper material formed of vegetable fibers, the filter paper may be a sheet using chemical fibers of a polymer type (polypropylene, polyethylene, nylon, etc.), or may be made of, for example, aluminum foil. Metal foil of the class.

The cigarette 1 may also contain a fragrance such as menthol. The perfuming method utilizes a wide variety of existing techniques. For example, in the manufacturing step, the tobacco yarn may be sprayed using a sprayer, or the fragrance may be added to the aluminum used in the package, and the fragrance may be moved to the smoking article. Further, a strip-shaped substance that adsorbs the fragrance may be disposed in the filter portion, or a tobacco filament may be disposed in a strip shape or a particle shape. Further, the fragrance may be contained in the filling material of the filter portion, or the powder may be disposed in the filter portion, and the powder system supports (immobilizes) the capsule containing the fragrance and the fragrance.

In addition to the general acetate filter and the activated carbon filter, the filter portion may contain a particulate matter other than activated carbon, for example, a powder containing a fixed fragrance, in a constituent element. Furthermore, the filter segment can also be used A cavity (also referred to as a cavity) composed of only a paper material is provided, and a capsule and a tobacco yarn may be disposed in the cavity portion. Further, in the filter segments shown in Figs. 2 and 3, the second filter segment 124 may not be provided. It is also possible to use only the first filter segment 122 to prevent the leakage of the tobacco.

A method of opening a paper material such as a filter paper can also be carried out using a wide variety of techniques. For example, a mechanical method of punching a hole by a needle-shaped tooth form (stamping) and an electrical method using a corona discharge may be employed, or a method may be used in which a rotary chopper is used for a rotating filter portion. The continuous output beam output by the laser oscillator is pulsed.

<Manufacturing method>

Fig. 4 is a view for explaining a method of manufacturing the cigarette 1. First, the tobacco is rolled up by a cigarette paper (Fig. 4: S1) by an existing technique, and the length of one cigarette is cut into pieces to prepare a tobacco rod 11 (S2). Further, the tobacco rod 11 is connected to each other at both ends of the filter portion 12 which is produced by the method described later, and the tobacco rod 11 is wound up by the filter paper of two cigarettes (S3). The ventilation hole 121 is formed at a predetermined position by laser irradiation (S4). In step S4, the rod to which the tobacco rod 11 and the filter unit 12 are coupled is rotated at a predetermined speed, and the laser output from the laser oscillator (for example, CO ₂ Ray) is used using a rotary chopper or the like. Shot), irradiated into a pulse shape of a predetermined frequency. The ventilating hole 121 can be formed in the filter paper and the formed body section 123 by using a pulsed laser. In addition, the depth of the venting opening 121 can be adjusted using the output of the laser. Thereafter, the length of one cigarette is cut in the center in the longitudinal direction to produce two cigarettes (S5).

As shown in Figure 4, if the length of the last two cuts is used The steps of the cigarette can be used in the existing production steps. Further, the method of manufacturing the cigarette 1 shown in Fig. 4 is an example, and for example, one roll of the filter paper may be used.

Further, the molded body portion 123 of the filter portion 12 connected to the tobacco rod 11 in S3 can be manufactured, for example, by using the jig of the schematic view shown in Fig. 5. The jig of Fig. 5 includes a cylindrical part 201 and forming heads 202 and 203 (S11 and the like). The cylindrical member 201 is a tubular metal member that is open at both ends, and can accommodate a cylindrical acetate filter plug 3 therein. Further, the forming heads 202 and 203 are inserted from both ends of the cylindrical member as indicated by a one-dot chain line, and the internal cellulose acetate filter plug can be crushed into a predetermined shape.

Here, the shape of the formed body segment 123 to be produced can be changed depending on the shape of the tip end of the forming head portions 202 and 203. For example, depending on the diameter of the tip end of the forming head portions 202 and 203, the thickness of the outer cylindrical portion of the cylindrical portions 1231 and 1233 and the sectional diameter of the hollow portion are determined. Further, an additional angle may be formed on the inner wall and the hollow portion of the tubular portions 1231 and 1233 by adding a taper to the tip end shape of the forming head portions 201 and 203.

The specific steps for producing the shaped body section 123 using the jig of the above are as follows. First, the cylindrical member 201 and the forming heads 202 and 203 are heated to, for example, 80 ° C to 200 ° C, and the acetate filter plug cut to a predetermined length is inserted into the inside of the cylindrical member 201. Then, the forming heads 202 and 203 are inserted from both ends of the cylindrical member 201, and the cellulose acetate filter plug is pressed (S11) to form the cylindrical portions 1231 and 1233 shown in Figs. 2 and 3; Hollow and form a wall in the center of the axis Part (S12). In this way, the tubular portions 1231 and 1233 and the resistance portion 1232 can be integrally formed. Thereafter, the resistance portion 1232 is formed by perforating at the central wall portion, and the formed body segment 123 is completed (S13). Further, the perforation may be performed using a cutting tool such as a drill, or may be performed using a laser irradiator. Further, a plug for perforation may be provided at the tip end of the forming head, and perforation may be performed simultaneously with the forming in S12. The formed body segments 123 produced in the above manner are respectively connected to the two ends of the filter segments 124 of the length of 2 pieces, and the filter segments 122 are respectively connected at both ends thereof and the suction port segments are wound with paper. 122 is rolled up (S14), and the filter portion 12 used in S3 of Fig. 4 is formed. Further, when the tubular portions 1231 and 1233 are integrally molded (compression-molded) with the resisting portion 1232 as described above, the density of the cellulose acetate tow compressed in the vicinity of the center in the longitudinal direction centering on the resistance portion 1232 is improve. From the viewpoint of the performance of the external air introduction, it is preferred that the non-through hole portion of the outside air passes through the lower density. That is, it is preferable that the position of the non-through hole is far from the resistance portion 1232 having a higher density and is close to the suction port. For example, it may be provided around the cylindrical portion 1233 shown in FIG. 3, that is, at a position closer to the end of the suction port side (downstream side) of the tubular portion than the resistance portion 1232.

<Example>

Figure 6 is a cross-sectional view showing the cigarette of the embodiment. First, in order to explain the specifications of the cigarette of the embodiment, the size of each part is defined. Further, the position of the ventilation hole 121 is indicated by a broken line so as to overlap the cross section. In addition, the longitudinal direction of the cigarette 1 is simply referred to as "longitudinal direction" hereinafter.

The cigarette of Figure 6 has a tobacco rod 11 and contains a filter The mouth segment 122, the shaped body segment 123, and the filter portion 12 of the filter segment 124. Further, the length of the tobacco rod 11 in the longitudinal direction is defined as the winding length L1, and the length of the filter portion 12 in the longitudinal direction is defined as the filter length L2. Further, the length in the longitudinal direction of the filter segments 122 and 124 is set to the filter plug length L3, and the length in the longitudinal direction of the molded body segment 123 is set to the molded body length L4. Next, the length from the end of the suction port side of the cigarette 1 to the ventilation hole 121 is defined as the mouth-ventilating hole length L5.

Fig. 7 is a sectional view for explaining a molded body section of the cigarette of the embodiment. In Fig. 7, the position of the vent hole is also indicated by a broken line in a manner overlapping the cross section. In the molded body section of the embodiment, two voids are formed inside, and the voids form an almost conical trapezoidal shape in which the longitudinal direction of the cigarette is set to the height direction. Further, the cross section of the formed body section has an almost circular outer shape, and its outer diameter (diameter) is set to a length L6. Further, in the inner diameter, the end side of the formed body section (also referred to as the diameter of the lower bottom of the truncated cone) is set to a length L7, and the center side of the formed body section (also referred to as the upper bottom of the truncated cone) The diameter is set to the length L8. Further, the length in the longitudinal direction of the tubular portion corresponding to the height of the truncated cone is set to L9. Further, the angle formed by the inner wall of the tubular portion of the formed body segment and the longitudinal direction of the cigarette is set to an inclination R1. Further, the thinnest portion of the thickness of the tubular portion is set to have a thickness L10, and the thickest portion is set to have a thickness L11. Further, the venting holes are provided along the outer circumference of the formed body section, and are arranged in a direction substantially perpendicular to the longitudinal direction of the cigarette. Then, the distance from the end of the suction port side of the formed body section to the ventilation hole is set to a length L12. Further, the diameter of the through hole provided in the resistance portion is set to a length L13. And, from the outer circumference of the formed body section to the depth of the bottom surface of the ventilation hole The degree is set to L14, and the remaining length from the thickness of the tubular portion minus the depth of the ventilation hole is defined as the remaining thickness L15.

The ventilation hole 121 of the cigarette of the embodiment is opened by laser irradiation. A laser irradiation machine ("3-Axis CO2 Laser Marker ML-Z9500 Series" manufactured by KEYENCE Corporation) was used for the laser opening. Further, the laser is irradiated while rotating the cigarette in the circumferential direction, and a predetermined number of ventilation holes are provided at equal intervals. Furthermore, the laser is illuminated towards the center of the cross section of the cigarette. Furthermore, the number of openings, the depth of the opening, and the area of the opening can be changed by changing the number of times the laser is irradiated, the intensity of the laser, and the area of the irradiation.

An example of a cross-sectional view of the cigarette cut along the row of the ventilation holes is shown in Figs. 8 and 9. The depth of the vent is measured in the following manner. First, the razor was placed along the venting hole of the cigarette, and it was cut into two. Then, the ventilator section was observed with a magnifying glass (optical microscope), and 10 ventilators were randomly selected to measure the depth. Next, the arithmetic mean of the measured values is obtained and set as the depth of the ventilation holes. Further, when the laser is irradiated toward the center of the cross section of the cigarette, as shown in Fig. 9, the depth direction of the vent hole may be separated from the center of the cross section. At this time, the depth and thickness of the vent hole are measured in accordance with the distance on the straight line passing through the center of the cross section to determine the depth and thickness of the vent hole. Further, the value obtained by subtracting the depth of the vent hole from the thickness is set as the remaining thickness. Further, as shown in Fig. 9, the ventilation hole may have an angle with respect to the diameter direction of the cross section of the cigarette. That is, the venting hole may not extend radially from the center of the cross section of the cigarette as viewed in cross section. Even if it is set in the diameter direction of the cross section of the cigarette The venting hole can also be made non-penetrating by being disposed obliquely with respect to the diameter direction of the cross section of the cigarette, so that the thickness of the cylindrical portion, the wound paper, and the filter paper is thinner. beneficial.

The ventilation resistance and ventilation rate of cigarettes are measured by "SODIMAX" (manufactured by SODIM Corporation). The ventilation resistance of the ventilating portion is measured in the following steps. The filter portion was cut away from the sample, and the cut section of the cut tobacco side was sealed as shown in Fig. 10. Then, the filter segment on the suction port side was removed, and the ventilation resistance generated at the time of suction at a flow rate of 1050 ml/part was measured from the suction port side, and the resistance was set as the ventilation resistance of the ventilation hole portion. Further, the flow rate of air flowing from the ventilating hole portion on the filter paper when sucking from the mouth side of the cigarette at 1050 ml/min was determined, and the value obtained by dividing the entire flow rate (1050 ml/min) was set as the air exchange rate. .

Fig. 11 and Fig. 12 are tables showing specifications of cigarettes and formed body segments of the examples. In the cigarette of the example, the winding length L1 was set to 58 mm, the filter length L2 was set to 27 mm, the filter plug length L3 was set to 7 mm, the molded body length L4 was set to 13 mm, and the suction port-ventilation hole was used. The length L5 is set to 12 mm.

Further, in the filter portion of the first embodiment, the outer diameter L6 of the molded body portion is 7.70 mm, the inner diameter L7 on the end side is 5.70 mm, and the inner diameter L8 on the center side is 3.70 mm. The inclination R1 was set to 9.46°, the length L9 of the longitudinal direction of the tubular portion was set to 6.00 mm, and the thickness L10 of the thinnest portion was set to 1.00 mm, and the thickness L11 of the thickest portion was set to 2.0 mm. Further, the through hole diameter L13 of the resistance portion was set to 0.8 mm. In addition, the ventilation rate is set to 75%. Furthermore, the length of the formed body is the length of the long side It was formed by pressing a 20.00 mm acetate filter plug.

The cigarette and the molded body portion of the second embodiment have the same specifications as those of the first embodiment except for the through hole diameter L13 of the resistance portion 1232. The through hole diameter L13 of the resistance portion 1232 of the molded body segment 123 of the second embodiment is set to 0.4 mm. Furthermore, the ventilation rate was set to 85%.

<sensory function evaluation>

The cigarettes of the first and second embodiments were aspirated by the evaluation team to evaluate the degree of smoke leakage. As described above, the vent hole is a non-through hole, and the cavity in the filter portion is structured to be spaced apart from the outside of the cigarette. According to the cigarettes of the first and second embodiments, it is known that smoke leakage is suppressed. In this way, by providing a non-through hole, the filter portion is provided with a desired ventilation resistance, and both high ventilation and smoke smoke suppression can be achieved.

<First to Third Comparative Examples>

Figure 13 is a cross-sectional view showing the cigarettes of the first to third comparative examples. Further, the position of the vent hole is indicated by a broken line in a manner overlapping with the cross-sectional view. The cigarette 1 of Fig. 13 has a tobacco rod 11 and a filter portion 12 including a filter segment 122, a shaped body segment 123, a void (cavity) segment 126, and a filter segment 124. The gap portion is separated from the outside of the cigarette 1 by a wrapping paper covering the filter portion and a paper material covering the tobacco rod 11 and the filter paper of the filter portion 12, and the inside is a void. Then, in the first to third comparative examples, a ventilation hole penetrating the periphery of the gap portion is provided. In addition, the length (winding length) of the tobacco rod 11 in the longitudinal direction is L1, and the length (filter length) of the filter portion 12 in the longitudinal direction is L2. Then, the length of the longitudinal direction of the filter segments 122 and 124 is set to the filter plug length L3, and the long side of the formed body segment 123 is formed. The length of the direction is set to the length L4 of the molded body, and the length of the longitudinal direction of the gap section 126 is defined as the gap length L16. Next, the length from the end of the suction port side of the cigarette 1 to the ventilation hole 121 is referred to as a suction port-ventilation hole length L5.

In Fig. 14, the specifications of the cigarettes of the first to third comparative examples are shown. Further, the specifications of the comparative examples will be mainly described on the differences from the examples. In the first to third comparative examples, the winding length L1 was set to 58 mm, the filter length L2 was set to 27 mm, the filter plug length L3 was set to 7 mm, and the molded body length L4 was set to 7 mm. The gap length L16 was set to 6 mm, and the mouth-ventilating hole length L5 was set to 12 mm. Further, the diameter of the through hole provided in the resistance portion of the formed body section was set to 0.74 mm.

In the first comparative example, the number of the ventilation holes was set to 10 per line, and the ventilation holes were set to one line. In the above method, when the ventilation resistance of the ventilation hole portion is measured, it is 65 mmH ₂ O. In addition, the ventilation rate of the cigarette was 57%, and the ventilation resistance was 32.8 mmH ₂ O.

In Comparative Example 2, the number of the ventilation holes was set to 37 per line, and the ventilation holes were set to one line. In addition, the ventilation rate of cigarettes is 75%.

In Comparative Example 3, the number of the ventilation holes was set to 37 per line, and the ventilation holes were set to one line. Further, the ventilation resistance of the ventilation hole portion was 7 mmH ₂ O. In addition, the ventilation rate of cigarettes is 85%.

<sensory function evaluation>

In the first to third comparative examples described above, it was confirmed that smoke leakage occurred remarkably. When there is a ventilation hole penetrating the gap section, the ventilation resistance of the ventilation hole portion may be remarkably low, and the smoke remaining in the gap may flow out from the ventilation hole.

<4th to 6th comparative examples>

In the fourth to sixth comparative examples, the configuration shown in Fig. 6 is the same as in the first and second embodiments. In Fig. 15, the specifications of the filter portions of the fourth to sixth comparative examples are shown. In the fourth to sixth comparative examples, the through hole was used as the ventilation hole, and the remaining thickness L15 was 0.00 mm.

In Comparative Example 4, the through hole diameter L13 of the resistance portion was set to 0.80. At this time, the ventilation rate (not shown) of the cigarette was 55%.

In Comparative Example 5, the through hole diameter L13 of the resistance portion was set to 0.80. Further, the ventilation resistance of the ventilation hole portion was 65 mmH ₂ O. The ventilation rate (not shown) of the cigarette is 75%.

In Comparative Example 6, the through hole diameter L13 of the resistance portion was set to 0.40. Further, the ventilation rate (not shown) of the cigarette was 85%.

<sensory function evaluation>

According to the fourth to sixth comparative examples as described above, the influence of the degree of penetration of the ventilation holes on the outflow of the smoke was verified. When the smoke was evaluated, in the fourth to sixth comparative examples, smoke was generated.

<7th and 8th Comparative Examples>

In the seventh and eighth comparative examples, the configuration shown in Fig. 6 is the same as in the first and second embodiments. In Fig. 16, the specifications of the filter portions of the seventh and eighth comparative examples are shown. In the seventh and eighth comparative examples, the "pre-opening" method of the vent holes provided in advance on the filter paper before the tobacco rod 11 and the filter portion 12 are rolled up by the filter paper is used. That is, the opening was not formed in the formed body section, and the vent depth L14 was 0.00 mm.

In Comparative Example 7, the penetration hole L13 of the resistance portion was used. Set to 0.80mm.

In Comparative Example 8, the through hole diameter L13 of the resistance portion was set to 0.40 mm.

Further, in Comparative Example 7 and Comparative Example 8, a "pre-opening" type filter paper having different vent holes was used, and Comparative Example 7 had more vent holes than Comparative Example 8.

The ventilation rates were 70.8% (Comparative Example 7) and 35.0% (Comparative Example 8), respectively, and it was found that it is difficult to carry out a low tar design with a tar of 3 mg or less (gas exchange rate of 75% or more). Further, the ventilation resistance of the cigarette are based 150mmH ₂ O and 210mmH ₂ O. This is because the ventilation resistance of the ventilation hole portion is large. When the conventional product design is adopted, the ventilation resistance of the cigarette is preferably 120 mmH ₂ O or less, and it is difficult to ensure a proper smoking feeling in the configurations of the seventh and eighth comparative examples. As described above, it has been found that the pre-opening of the filter paper is not preferable from the viewpoint of the difference from the smoke leakage.

<Other variants>

The position of the through hole in which the resistance portion is provided is not limited to the center of the cross section. Further, in the above-described example, only the example having the resistance portion has been described, and the cylindrical body having no resistance portion may be configured to have a non-through hole. Even in such a filter portion, smoke leakage can be suppressed.

Further, the specification of the cigarette shown in the embodiment is an example, and the ventilating hole suppresses the leakage of the smoke from the cavity in the filter portion, and is variable in a range in which the foreign air can be introduced into the cavity when the cigarette is smoked. .

For example, in the cigarette shown in the embodiment, the through hole diameter L13 of the resistance portion is changed to about 0.40 mm to 0.80 mm, and The depth L14 of the vent hole is changed to about 0.50 mm to 1.50 mm and the desired specifications are adopted.

Similarly, in the cigarette shown in the embodiment, the penetration hole diameter L13 of the resistance portion may be changed to about 0.40 mm to 0.80 mm, and the inner diameter L7 of the end portion side of the molded body portion may be changed to about 4.62 mm to 5.64. Further, the center-side inner diameter L8 is changed to about 2.62 mm to 5.01 mm, the inclination R1 is changed to about 3.00 to 9.46, and the thickness L10 of the thinnest portion is changed to about 1.00 mm to 1.54 mm, which is the thickest. The thickness L11 of the part is changed from about 1.31 mm to about 2.54 mm to achieve the desired specifications.

Further, in the cigarette shown in the embodiment, the length of the filter plug before pressing when forming the molded body portion may be changed to 25.00 mm to 40.00 mm, and the force of pressing may be changed to form the embodiment. The molded part of the specification is in the ideal size.

Further, the filter portion may be provided as a tobacco product including a filter portion in a member, or may be provided as a member that is detachably attached to a tobacco product. The tobacco product may, for example, be a paper roll tobacco (filter cigarette, two cut tobacco (no filter)), a cigar (cigar), a cigar, a non-combustible tobacco suction device with heating or an unheated type. Tobacco suction equipment, etc.

Further, in the tobacco product such as a cigarette of the present embodiment, if a non-through hole having a predetermined air permeability is provided in the hollow portion of the filter, the outside air can be introduced into the inside of the filter when the tobacco product is sucked. In addition to this, if the hollow portion of the filter does not have a through hole, it is possible to sufficiently prevent the smoke from leaking from the inside of the filter. Therefore, in addition to the non-through holes of the embodiment, It can have other configurations. For example, it is also possible to have a through hole (only a through hole shown in the seventh and eighth comparative examples) provided only in the filter paper.

11‧‧‧Tobacco stick

12‧‧‧ Filter section

13‧‧‧ Filter paper

121‧‧‧Ventilator

122‧‧‧(1) filter segment

123‧‧‧Formed segments

124‧‧‧(2) filter segment

125‧‧‧ Winding paper

1231‧‧‧(1) cylindrical part

1232‧‧‧Resistance

1233‧‧‧(2nd) cylindrical part

Claims (12)

A filter for a tobacco product, the filter being formed of a porous material and including a cylindrical body having a hollow inside, and the cylindrical body having a non-through hole having a predetermined air permeability. The filter according to claim 1, wherein the non-through hole suppresses leakage of the smoke from the cavity, and the outside air can be introduced into the cavity when the tobacco product is sucked. The filter according to claim 1 or 2, wherein the inside of the cylindrical body has a resistance portion for restricting the ventilation amount, and the non-through hole is located closer to the tobacco product than the resistance portion. The position of the suction side. The filter according to claim 3, wherein the resistance portion partitions the cavity into a wall of the tobacco side and the suction side of the tobacco product, and has a through hole in the wall. The filter according to claim 3, wherein the tubular system having the resistance portion is formed by compression-molding a cellulose acetate plug. The filter according to any one of the items 1 to 5, wherein the shape of the cavity inside the cylindrical body includes a conical shape in which a longitudinal direction of the tobacco product is a height direction or Conical ladder shape. Filtering as described in any one of claims 1 to 6 a mouth, wherein the tubular system is further provided with a cellulose acetate plug on at least the side of the tobacco of the tobacco product. The filter according to any one of claims 1 to 5, wherein the cylindrical body and the resistance portion are integrally formed. The filter according to any one of the above-mentioned items, wherein the non-through hole provided in the cylindrical body is provided in the resistance portion which is provided inside the cylindrical body. It is closer to the position of the suction port side end portion of the cylindrical body. The filter according to any one of claims 1 to 9, wherein the non-through hole is formed from a cross section of the filter, and is formed in a diameter direction with respect to a cross section of the filter. angle. A tobacco product, comprising: the filter according to any one of claims 1 to 10; a tobacco rod connected to the filter and comprising tobacco; and the winding of the filter and the tobacco A paper material; wherein the paper material has an opening at a position overlapping the non-through hole. The tobacco product of claim 11, wherein The cross section of the aforementioned tobacco product has a diameter of 5.0 to 6.5 mm.