TW200418399A - Filter assembly for cigarette - Google Patents

Abstract

A filter assembly for a cigarette includes a dual filter (6) having a charcoal filter element (10) and a plain filter element (12) and a tip paper (8) having a punched region (24). The dual filter (6) has a permeability determining band for determining the volume of airflow VFS into a filter material (14) of the plain filter element (12) dominantly rather than the punched region (24). The permeability determining band includes a low flow rate layer formed by an inner wrapping material (16) or an outer wrapping material (18) of the filter element (10, 12), and an air layer (22) surrounding the low flow rate layer.

Description

200418399 (1) Description of the invention: [Technical field to which the invention belongs] The present invention relates to a filter assembly for mainstream cigarettes with a filter, particularly to a filter assembly for cigarettes that allows outside air to enter. [Prior Art] Four types of filter units have one end connected to a cigarette and a mouth end. In more detail, the filter assembly includes a cylindrical filter having a rod-shaped filter material and a packaging material surrounding the filter material. The filter assembly also includes Up " Paper to connect the filter to a cigarette. The wrapper wraps the filter with the cigarette, and extends from the suction end of the filter element to one end of the cigarette when viewed from the cigarette axis. For example, as disclosed in the Japanese Patent No. 3 丨 94580, the wrapper paper has a plurality of perforated rows, and the perforated rows are formed by a plurality of small holes arranged at intervals in the outer circumferential direction of the filter. In this case, the Z material of the filter has high air permeability. If the wrapper paper has the above-mentioned perforation line, when the filter cigarette is sucked, the mainstream smoke from the cigarette passes through the filter and the outside air passes through the perforation line of the wrapper paper through the packaging material and flows into the filter. Inside. After diluting the mainstream smoke in the filter, the smoker will inhale the diluted mainstream smoke after flowing into the filter, and the smoke will be enjoyed without losing the original flavor of the cigarette. . From the above description, it can be seen that the importance of cigarette smoking experience is largely influenced by the degree of opening of the cross-hole row, that is, the effect of ventilation S flowing into the filter and the outside air. Therefore, this ventilation volume becomes the determining factor of smoking experience. 5 of light weight 315440 200418399 important voxels. However, when smoking, the filter assembly is caught in the smoker's mouth, so some of the perforated rows may be blocked by fingers. In this situation, the opening of the perforation column is reduced, and the dilute effect expected by mainstream smoke, that is, the desired smoking experience, cannot be achieved. SUMMARY OF THE INVENTION The object of the present invention is to provide a filter assembly for cigarettes, which can suppress the amount of air that should flow outside the filter during smoking, even if the perforated rows of the filter element are blocked. This reduces the smoker's desired smoking experience and aroma. In order to achieve the above object, the filter assembly of the present invention includes: a cylindrical filter, the filter comprising: a filter material capable of filtering tobacco smoke; and an air permeability covering the filter material and forming an outer peripheral surface of the filter The outer layer; a wrapper paper for rolling up the filter to connect the filter to the cigarette, the wrapper paper covering the outer periphery of the filter, and having a perforated area for the outside air to flow toward the filter; The tubular air permeability determination band between the tip paper and the filter material has the air permeability that determines the air ventilation volume outside the filter material more dominantly than the perforated area when smoking cigarettes. In the aforementioned filter assembly, the amount of air flow into the filter, that is, the ventilation volume of the filter assembly, is substantially determined by the air permeability determining zone. Therefore, even when the perforated area of the tip paper is partially clogged by the smoker's fingers when smoking, the ventilation of the filter assembly will not change much. As a result, the filter assembly of the present invention is not affected by the smoking behavior of smokers 315440 6 200418399. "Not only can the tn value of the cigarette indicated on the cigarette box be substantially maintained", but also the smoker can provide his or her smoking. Specifically, the perforated field includes two or less perforated rows formed on the tip paper. The perforated rows have a plurality of perforations arranged at intervals in the circumferential direction of the filter. When the cigarette end of the filter unit is in a blocked state τ, and the air is sucked in from the suction end, the amount of air flowing into the filter and the outside air through the perforation determination band through the perforation area is not in the perforation area. In the case of plugging and 50% of the perforation, the ventilation volume is expressed as VFN and vFB, respectively, and the ventilation determination zone has a ventilation level of VpB maintained at 60% to 90% of the ventilation volume VFN. As mentioned above, even if the perforation area is blocked by 50%, it can fully ensure the passing; considering the amount of airflow inside and outside the module, that is, the ventilation, the actual TN 'will not greatly deviate from the indicated value. Specifically, the filter unit is divided into the outer part of the air permeability determination band and includes the outer part of the perforation area, and the inner part of the filter material from the air permeability determination band. The ventilation resistances on the outer and inner parts are respectively expressed as For R! And R2, the ratio of these ventilation resistances Ri / R2 is set to 2 or less. In other words, when the air permeability of the outer and inner parts is expressed as t, the deviation ΔQhQrQj of these air permeability Q], Q2 is in the range of _2 00 () to 4000CU (CORESTAUnit). If there is no deviation between the ventilation resistance ratio and the degree of ventilation as described above, the determination of the degree of ventilation f will delay the introduction of air into and outside the filter material, so 315440 7 can also effectively suppress the filter group from wrapping the tip paper. The perforation area of the perforated area is changed by the ventilation of the partially obstructing member. When the animal filter is only formed by the so-called plane flher filter, the external part of the module is formed by the sacral ridges, and, and the internal part of the filter element is only vented; f decided; ^ p, rolling degree can be formed. In this case, the air permeability determining band includes a wrapping material that wraps the transition material into a rod shape as the outer layer, and a space layer secured between the dagger material and the wrapping tip paper. On the other hand, the transition unit 彳 is replaced with a flat filter (no _?) Filter, n. In this case, the filter has an outer skin layer obtained by thermoforming the filter material as the outer layer. In addition, even if the transitional device is a so-called double filter, the double transition means includes the first and second types of transitional elements arranged rearward and rearward in the axial direction of the cigarette, & the first! The first and second types of filter elements are each of the first and second types of filter elements each including a filter material and an inner wrapping material that surrounds the transition material; and the first and second filter elements are wound around the filter element To connect the outer packaging material of these filter elements. Specifically, at least one of the first and second types of filter elements is an improvement material for mainstream cigarettes, and T includes an additive material such as charcoal particles. In the case of the aforementioned dual filter, the air permeability determination belt includes one of the inner packaging material and the outer packaging material. When the air permeability determining band includes an inner packaging material, the outer portion of the filter assembly is formed by a tip paper and the outer packaging material, and the inner portion of the filter assembly is formed only by the inner packaging material. In contrast, when the air permeability determination belt includes the outer packaging material, the outer part of the filter assembly is formed only by 315440 8 200418399 wrapping paper. The inner part of the filter assembly is made of the outer packaging material and any of the conditions described in the inside. The ventilating susceptibility yr ^, t will be more complicated. The space layer surrounding the inner packaging material or the outer packaging material from the outside will be more reasonable. μ ^ _ means the right ideal. Specifically, the air layer of the double filter is indeed accompanied by the meat and is protected between the packaging material and the outer packaging material, or between the outer packaging material and the tip paper. In addition, the plane over-reducing cone 别 mentioned above, and the space layer in the double filter and the dual filter, at least a thickness of 40 μm is ideal. The iS animal milk_Qi of the aforementioned outer part is higher than the air permeability Q2 of the inner part, which is ideal. In this case, the inner or outer packaging material forming part of the milk penetration determination belt is formed. The publication < milk penetration degree can be selected from the range of 100 to 5000 cU. [Embodiment] The cigarette assembly 2 is provided with a cigarette 2 and a filter assembly connected to one end of the cigarette with a filter as shown in Fig. 1. The filter assembly 4 includes a double tear filter 6 and the double filtration. Device 6 is connected to incense and cigarette 2 with a wrapper paper 8: while the double filter is 6 with a charcoal filter, filter element 10 and a filter element 12 adjacent to the charcoal filter element 10 These elements 10 and 12 are arranged side by side. The filter 1 § elements 10 and 12 include a fibrous filter material 14 and an inner packaging material 16 that wraps the filter material 14 into a cylindrical skin, and the inner packaging material 16 has a seam. The interface is formed by overlapping the rain-edged edges of the inner packing material 16 with each other by pastes, and the two ends are bonded to each other. Charcoal filter 9 315440 200418399 The filter material 14 of the device element 10 contains a large number of charcoal particles (not shown in the figure) ′ These charcoal particles are evenly distributed in the filter material 14. In contrast, the filter material 14 of the ordinary filter element 12 does not contain charcoal particles. The dual filter 6 further comprises an outer packaging material 18 which is integrally connected to the filter elements 10, 12. The outer packaging material 18, rolled up the filter elements 10, 12, has two edges that overlap each other through the paste, that is, the connection Π 〇

As shown in Fig. 1, a space layer 22 is ensured between the outer packaging material 18 and the inner packaging material 16. The space layer 22 is formed by disposing a spacer between the outer packaging material 18 and the inner packaging material 16. Here, the pad includes an embossed surface formed by the inner surface of the outer packaging material 18 and / or the outer surface of the inner packaging material 16 or is disposed between the outer packaging material 18 and the inner packaging material 16 Slime. The paste layer of the cushion is formed in accordance with a desired pattern so that the space layer 22 exists throughout the entire area of the inner wrapping material 16. In the case of the cigarette with a filter shown in Fig. 1, the inner surface of the outer packaging material 18 is formed into an embossed surface, so that the space layer 22 can be extended over the entire outer peripheral surface of the filter element i 0,] 2. The layer thickness of the space layer 22 is more than 40 # m, and more preferably 60 // m or more. Also, the aforementioned wrapper paper 8 includes a perforated area 2 4. It can be seen from Fig. 1 that the 'perforation field 24 has a plurality of perforation rows 26, and the perforation rows 26 are arranged outside the ordinary filter element 12. Each of the perforation rows 26 is formed by a plurality of perforations, and the perforations are formed at predetermined intervals throughout the entire circumference of the filter unit 4. 10 315440 200418399 Wrapping paper 8 is in addition to the perforated area 24 — followed by the double filter 6 and the cigarette 9th, and the outer surface is covered by 2 circular paste layers. f, a small-square paste layer 28a, which is located on the ferrule and is more flat and flat, and the ferry 6 is connected to the tip paper 8. Another — 'and the mouth end side, make the double filter 6 cross one of the incense and smoke 2 ends, and move the ::: paste layer from the double mouth opening, the dagger paper 8 and the cable, respectively. 6 and cigarette 2 are connected. Because the wrapper paper is air-heavy, the air permeability of the wrapper paper 8 is determined by the area of the mouth that allows empty milk to pass through. The money bag is the opening of the perforated column 26. The inner packaging material 16 is formed as a low-permeability layer with lower air permeability than the outer packaging material 18. / 、 Xia a, as shown in Fig. 2, the inner packaging material 16 and the air layer 22 are turned 9 to cooperate to form the air permeability determination band. In this case, the outer side of the surrounding air permeability determination band is called < However, the outer side band of the consideration module 4 is formed by the outer wrapping material 18 and the tip paper 8. When smoking a filter cigarette, the degree of air permeability determining belt is higher than the outer belt, that is, the outer packaging material 18 and the perforation collar 24, 24. The dominant decision is to flow into the dual filter from the outside, inside and outside the device 6 The VFS in the milk is the VFS (the dilution air volume of the mainstream smoke of cigarettes) that flows into the inside and outside of the filter material 14 of the ordinary filter element 12 and the outside 1 and the outside. On the other hand, the ventilation volume VFS of a normal filter unit is determined by the band surrounding the outside of the filter material. In more detail, V here includes the perforation area, the inner and outer packaging materials, and the perforation area, the inner and outer packaging materials, and the air permeability are determined according to the required air volume VFS of the filter assembly. Specifically, the permeability of the perforated area (wrapped paper) is selected from the range of 200 to 4200CU, and the permeability of the inner and outer packaging materials 315440 200418399 has a higher degree of ventilation than the perforated area, for example, from 1 Choose from 300 to 30000CU. In the case of the filter assembly 4 of the present invention, the air permeability determination band, ie, the air permeability M of the inner packaging material 16 serving as a pure air permeability layer, is higher than the air permeability of the inner packaging material used in ordinary filter elements (for example: 丨Left and right) Low, you can choose from the range of 100 to 5000CU according to the required air volume of the filter assembly. On the other hand, the ventilation rate of the outside zone is determined by the ventilation rate of the perforation area 24 and the outside package material 18). -2000 to 4000CU is selected as standard. In the case of attack type ', it is preferable that the air permeability Qb of the outer band is higher than the air permeability Qiw of the inner packaging material 16. Table 1 'specifically shows the selection ranges of the required air volume VFS for the filter element 4, the air permeability Qiw of the inner packaging material 16, and the air permeability qb of the outer band. Table 1 VFS (%) Qiw (CU) Qb (cJ ^ _ 40 250 to 900 375 to 4200 50 400 to 1500 600 to 4200 60 60 650 to 2100 ----- 975 to 4200 Inner packaging material 16 as In the case of a low air permeability layer, it is desirable that the air permeability Qow of the outer packaging material 18 be as high as possible. For example, the filter 12 in Figure 1 315440 200418399

In this case, the ventilation Q of the outer packaging material 18 on the outer side of the device assembly 4 is the same as the ventilation Q of the perforated area 24. ^ .g. ^ N. It is assumed that the filter incense burner T provided with the filter assembly 4 described above is partially blocked by the smoker's fingers. In this case, as shown in FIG. 2, the remaining portion of the perforated area 24 flows into the inside and outside of the filter unit 4 and collides with the outer packaging material 18. However, since the air permeability of the outer packaging material 18 is 0 °, ra + k M and lice degree gow are the same, the outside air smoothly passes through the outer packaging material 18 regardless of the presence of the outer packaging material 18 'and is introduced into the space layer a. After that, the outer air I ^ the space layer 2 2; 隹 half, S, J1 rVt / »t J further passed through the inner packaging material 16, that is, the low air permeability layer, into the filter material Within 1 to 4, the mainstream smoke of cigarette 2 is diluted. Since the permeability QIW of the inner packaging material 16 is lower than that of the usual inner packaging material, the air from the space layer 22 to the inside and outside of the filter material 14 is introduced by the inner packaging material 6 Hold off. Therefore, the air introduced into the space layer 22 passes through the space layer 22 and expands to the outer surface of the inner packaging material 丨 6. As shown by the arrow in the figure 2, the outer air passes through the entire area of the inner packaging material i 6, and then It is introduced into the filter material 14. From the above description, it can be seen that the ventilation volume VFS into the filter module is determined by the inner packaging material 16 of the ventilation rate layer, and whether the perforation area 24 of the tip paper 8 is partially blocked, which almost affects the ventilation volume VFS. No effect. As a result, while maintaining the ventilation volume VFS (diluted air lice) of the filter unit 4 stably ', undesired changes in the feeling and flavor of the suction filter cigarette do not occur. 315440 13 200418399 As shown in Figure 3, the filter assembly 4 of the present invention may include a replacement inner side. The material 16 serves as the outer packaging material of the low air permeability layer. In this case, the work layer 22 'is ensured between the wrapping paper 8 and the outer wrapping material worker 8. The air layer 22 is formed by forming the aforementioned embossed surface on the wrapping tip, the inner surface of the paper 8 or the outer wrapping material 18, or arranging the aforementioned paste layer between the wrapping tip, the paper 8, and the outer wrapping material 18. make sure.

When the outer packaging material is formed as a low-permeability layer, the air permeability determining band of the filter assembly 4 is formed by the air layer 22, the outer packaging material η, and the inner 2 packaging material 16 and surrounds the air permeability determining belt. The outer band is formed by a wrapper paper 8 having a perforated area 24. In this case, the inner packaging material 16 has the highest possible air permeability, such as the air permeability Qw of 300000cu, which does not substantially affect the air permeability of the air permeability determination zone. Therefore, the air permeability of the air permeability determination zone is substantially determined by the air permeability Q 0w of the outer packaging material i 8. In order to make the deviation ΔQ (= QT-Q0W) between the air permeability QT and the air permeability Q〇w of the perforation area 24 within the range of -2000 to 40000cu, the air permeability of the outer packaging material a is from 100 Choose from 5000CU, which is lower than the air permeability of the outer packaging material used in common filter components (for example: around 1000Cu). In this case, it is also desirable that the ventilation Qt is larger than the ventilation QQw. Specifically, in the case of the filter assembly in FIG. 3, the air permeability Qow of the outer packaging material ^ $ and the air permeability QT of the perforated area 24 are selected from the ranges in Table 2 below. 14 315440 200418399 r ——-- X τ, eight tables 2 __ ^ (%) ___ Qow (CU) Qt (CU) 40 — ^^ ___ 250 to 900 375 to 4200 50 -------- 4〇〇 to 1500 6600 to 4200 60 ----——___ 650 to 2100 975 to 4200 In the case of filter cigarettes with a filter assembly in Fig. 3 and Fig. 3, it is false. The perforated area of the paper 8 is partially blocked. ， Case ’The air permeability of the outer packaging material i 8 is low. From the perforated collar ^ to the summoning part, it passes through the space layer 2 2 and passes the outer packaging material} 8. The air is delayed by the outer packaging material 18. Therefore, the outside air expands in the air layer 22 through the entire outer surface of the outer packaging material 18, and reaches the inner packaging material 16 through the outer packaging material 1 $ 之 域 #. Since the air permeability Qiw of the aforementioned inner packaging material 16 is not suspended, regardless of the presence of the inner packaging material i 6, the outside air passing through the outer packaging material worker 8 passes through the inner packaging material 16 and is introduced into the filter material μ. As a result, the filter assembly in FIG. 3 is the same. Regardless of whether the perforated area 24 of the tip paper 8 is partially blocked, the ventilation volume Vfs is substantially determined by the ventilation degree Qow of the outer packaging material 18, which is diluted relative to the mainstream smoke. The amount of air, VFS, did not change much. The following Table 3 is for a conventional cigarette with a filter assembly (Comparative Example C), a cigarette with a filter assembly of FIG. 2 of the present invention (Example E 1) and the first cigarette of the present invention. The filter of Fig. 3 with a filter component of Fig. 3 is a cigarette (Example E2), which indicates whether the perforation area 23 'is blocked or not, and the relationship between the ventilation director vfs and Vfb. 315440 15 200418399 Φ In Table 3: TP: wrapping paper D: perforation diameter of wrapping paper Qow: air permeability of outer packaging material QIW · air permeability of inner packaging material AL: air layer G: inner packaging material of Comparative Example C Clearance from outer packaging material FA: Filter unit

Table 3 TP Qow 〇IW AL (G) FA D Qt (CU) (CU) (/ ^ m) Qan Qab MR vFN vFB △ VF (Um) (CU) (CU) (CU) (%) (%) ( %) C 120 1000 10000 10000 20 475 239 50 55.0 34.5 20.5 E1 200 2840 30000 530 60 475 409 86 51.7 46.9 4.8 E2 200 2840 670 30000 60 470 366 78 51.4 44.0 7.4 QAN: The normal state of the perforation area is not blocked by 50% Air permeability of filter assembly

Qab: Perforation field only blocks 50% of the blocked state of the filter, the ventilation of the device component MR: Ventilation degree maintenance rate (Qab / Qan) VFS: Permeation field of the filter component in the normal state, VFB: Perforation Ventilation volume of the filter assembly in the blocked state △ VF: Ventilation deviation (VFN_VFB) and the end face of the filter assembly 4 on the cigarette 2 side is completely blocked 16 315440 200418399 Under 'from the suction port end of the filter assembly 4 Attract air, and measure the air flow volume from the perforation area 24 at this time, and obtain the ventilation Qan and Qab, and the ventilation volume VFN and VFB. Both the cigarette of Comparative Example c and the cigarette of Example E ^ Ε2 are filters of the same variety (MILD SEVEN SUPER U (3HT (trademark)). As can be seen from Table 3, in Comparative Example c The perforation area of the tip paper is 50%, and the air permeability maintenance rate is the dove. The amount of air flowing through the perforation area in the filter assembly is greatly reduced. As a result, the air volume between the air volume Vfn and the air volume vFB The deviation aVf increases by 205%. In the case of Comparative Example C, the air permeability of the wrapper paper is very low compared to the air permeability of the inner and outer packaging materials, so it means the air volume of the filter module. VFS is dominated by wrapper paper, that is, the permeability of the perforated area (the opening area of the perforated column). In contrast, in the case of σ, yoke examples E 丨, E2, even if the perforated area 24 is blocked by 5G%, the ventilation is maintained Rate mr ", 78%, and the ventilation deviation ΔνP is limited to 4.8% and 7.4%. This means that in the case of E1 and E2, the ventilation volume Vps of the filter assembly is not perforated The opening area of Field 24 is dictated. Any of the cases E1 and E2 The air permeability QT of the wrapper paper 8 is higher than the inner air permeability of the melon-based air permeability determination belt! 6 or the air permeability Q of the outer air quality i 8 is higher than w and Qow, but as long as the deviation value AQ is within the aforementioned range, then The air permeability Qt may also be smaller than the air permeability Aw 4 Qow. If the air permeability or Qow is lower than the inner packaging material or 17 315440 200418399 of the outer package material, the inner or outer packaging material is much lower. If it is applied to a filter assembly, the filter assembly of the present invention can give full play to the aforementioned effects. The air permeability qt of the wrapper paper 8 of Examples El and E2 is included in the wrapper paper used in ordinary filters and filter assemblies. Ventilation range (200 to 4200CU), but it can also exceed this range. That is to say, the ventilation Qt must not only be based on the ventilation volume VFS required by the filter and device components, but also according to the thickness of the air layer 22 described above. In more detail, even if the air volume is constant, if the layer thickness of the air layer 22 is small, the air permeability Qt will be large. In contrast, if the layer thickness of the air layer 22 is large, the air permeability qt is small, There is no problem. The ventilation deviation avf, c and Comparative Example E of Example 1 of the filter assembly replaced to explore an analog electrical circuit.

Assuming that the air permeability Qb of the outer band (wrap paper and outer wrapping material) and the air permeability Qlw of the inner wrapping material have ventilation resistance Ri and ventilation resistance R2, respectively, the filter assembly can be represented by an analog electrical circuit. In this case, the ventilation resistances Ri and R2 can be expressed by the following formula. Ri (KPa / CU) ^ (QT + Q〇w) / (QT. Q〇w)

R2 (KPa / CU) = 1 / QIW Therefore, the impedance ratio R1 / R2 is the following expression.

Ri / R2 = k · QIW · (Qt + Q〇w) / (Qt · Qow) where k is the space existing between the inner packaging materials through the perforated aperture in the perforated area, from the tip of the wrapper to the inner packaging material. (Gap and / or space layer) The permeability of the outer packaging material (Q〇wHt is obtained as a function of parameter f, the function I ^ 315440 18 200418399 K = f (aperture 'space, Q0W) 2 1 The filter assembly can be shown in Figure 4 and Figure 4: Air bag circuit. Figure 4 shows the normal state of the blockage in the perforation field, and Figure 5 shows the blocked state of the blockage in the perforation field in Table 7F. "K 施The filter assembly of Example E1 can be represented by the electrical circuit in Figure 6 and Figure 7. Figure 6 shows the normal state of perforation area 24 is not blocked. Figure 7 shows that the perforation area 24 is partially blocked and blocked. Specifically, in the case of Example E1, the ventilation resistance & and L were 4.62 ^ 0 ^ 164 ^ 3, respectively, and the impedance ratio was Ri / r ^ 〇.28. In contrast, in the case of Comparative Example C, the ventilation resistance h and R2 are 19 · 7χ 10-3 and 1.33χ IO · 4, respectively, and the impedance ratio Ri / r2 is 14.8. It is known from the comparison between Figure 4 and Figure 5 In the case of Example c, when the pore area is partially blocked, the ventilation resistance ~ is greatly increased. This means that the ventilation volume of the filtering benefit module is determined by the perforation area of the tip paper and the dominance of the outer packaging material. On the other hand, comparing FIG. 6 and FIG. 7, in the case of Example E1, even if the perforated area 24 is partially blocked, the ventilation resistance R1 does not increase much. This means that the ventilation volume vfs of the filter assembly 4 is not determined by The perforation area 24 and the outer packaging material i 8 are determined, but are determined by the inner packaging material i 6. Figures 8 to 11 show filter assemblies having the electrical circuits of Figures 4 to 7 respectively. In Figures 8 to 丨 丨, the flow of outside air flowing into the filter assembly is indicated by arrows.

Comparative Example C 19 315440 Hole collar: =: Lt: In the normal state of obstruction (Figure 8), external air passes through and penetrates inside. Corresponding to the inner packaging material outside the peripheral surface of the filter, when the material (Figure 9) Day: Wear: a part of the field is blocked in a blocked state side ^ 从 only corresponds to the remaining part of the perforated field Inside _ The part of the perimeter surface flows into the filter material. In Embodiment E1, in a normal state where the perforated area 24 is not blocked (FIG. 10), the entire area from the outer surface of the inner packaging material Π flows into the rafter material 14. In the perforation field 24, one of the eight # _ —, the trowel is blocked by the blocked base (Figure 丨 丨), the outside air is also from inside: almost all of the outer surface of the packaging material 16 flows into the filter material 14. Because the ventilation volume VFS of the filter element of Example E1, whether the perforation area 24 is partially blocked or not, will not change much. The main figure 12 shows the relationship between the impedance ratio Rl / R2 described below and the ventilation volume deviation ΔνP when the required ventilation volume Vfs of the filter unit 4 is 50%. As can be seen from the second figure, when the impedance ratio Ri / Rj 2 or less, the deviation AVf of the through-rolling of the filter assembly 4 is larger than the deviation ΔVF of the ventilation rate of the filter assembly of Comparative Example c by 20 · 5% (see table). 3)) suffered a reduction. Therefore, in the case of the filter unit 4 of the present invention, the impedance ratio Ri / R2 is set to 2 or less. On the other hand, the oblique line area in FIG. 13 indicates the air permeability of the packaging material for the air volume νρ and the machine-to-machine resistance ratio of 2 or less. Therefore, if it is set to the ventilation degree Vfs required by the filter assembly 4, the ventilation degree qiw of the inner packaging material 16 can be determined by the jaw region of the oblique line in Fig. U. The effects shown in FIG. 7 and FIG. 丨 丨 are not the 315440 20 200418399 E2 of the filter 4 of the embodiment e. The filter 4 is also unique to the ventilation volume deflection filter assembly 4 of Table 3. The embodiment is implemented. In the case of Example E1, the same effect ΔVF was known. In the case of the filter assembly of Example E2, it represents the pass-through resistance of the tip paper 8 (the perforation item domain 24), and R2 represents the combined air-resistance of the outer-side wrapping material 18 and the inner-side wrapping material 16 as the low-air permeability layer. In this case, the ventilation resistances Ri and R2 and the impedance ratio R] / R2 are based on the air permeability Qt and Qqw of the rain-covered tip paper 8 and the outer wrapping material 18, and can be expressed by the following formula.

R1 (KPa / CU) = l / QT r2 (_cu) ow

Ri / R2 = k · Qow / qt is calculated by a function f using the aperture 26 of the perforation area 24, the space between the outer packaging material 18 and the wrapping paper 8 and the air permeability% of the outer packaging material as parameters. The obtained value, the function f is expressed by the following formula. k = f (aperture, space, Q〇w)-1 Because the ventilation Qiw of the inner packaging material 16 is very high, it will not affect the ventilation resistance R2. Therefore, the parameter f of the function f does not include the degree of ventilation Qi 〆 Example E2 The impedance ratio R " R2 is of course also set to 2 or less. Therefore, in the case of Example E2, if the ventilation volume Vfs of the filter unit 4 is set, the ventilation degree Qow of the outer packaging material 18 is determined from FIG. 13. Specifically, in the case of the known example E2, the impedance ratio R] / R2 is 0.37. The present invention is not limited to the examples El and E2, and can be variously modified. For example, the filter components of E1 and E2 all include a double pass 315440 21 200418399 filter 6. The filter assembly of the present invention may include a general pass filter 30 as shown in FIG. 4. The ordinary filter 3 0 ′ includes a filter material 14 and a packaging material 31 which wraps the filter material 14 into a cylindrical shape. In this case, the packaging material 3 2 is formed as a low-air-permeability layer, and a space layer 22 is formed between the packaging material 31 and the wrapping tip paper 8. The space layer 22 is ensured by the embossed surface formed on the outer surface of the packaging material 3 or the paste layers 28a and 28b adhering to the packaging material 31 and the wrapping paper 8. The aforementioned paste layer 28 has a pattern that can be distributed to form the space layer 22 throughout the entire area of the packaging material 31. The filter assembly of the present invention may include a non-lump filter 32 as shown in FIG. The non-lump filter 32 includes a filter material 14 and the filter material 14 is formed into a cylindrical outer skin layer 34. The outer skin layer 3 4 is obtained by thermoforming of the filter material 14. This kind of outer skin layer 34 forms a low-air-permeability layer. Even in this case, a space layer 22 is formed between the outer skin layer 34 and the wrapper paper 8, and the space layer 22 here is formed through the inner surface of the wrapper paper 8. The embossed surface, or the pasted layers 28a, 28b of the wrapping paper 8 and the non-lump filter 叨 are secured. μ is to adjust the permeability of the outer skin layer 34. The outer skin layer 34 may have a large number of sub-MLs (not shown at this time, these tiny holes are evenly distributed throughout the entire outer skin layer. The filter components in Figs. 14 and i 5 are also Similarly, the air permeability Qt (Qi) of the wrapper paper 8 (perforation area 24) and the air permeability Ql (the deviation between QJ of the low-air-permeability layer 包 side wrapping material η or the skin layer 34) Δ Q (= QT_Qj, in _ In the range of 2000 to 4000CU. 315440 22 200418399 In other words, make the ventilation resistance of the wrapper paper 8 (the perforated area 24) to be, and the ventilation resistance of the low air permeability layer (the inner wrapping material 31 or the outer skin layer 34) to be 2 The impedance ratio Ri / R2 is set to be less than 2. In this case, the ventilation QL is selected from the range of 100 to 5 000 CU. The following Tables 4 to 6 are the explanations for the difference in ventilation volume VFS a

Water πσ A leads to C ', which indicates the simulation of the air permeability maintenance rate, the air volume deviation Z \ VF, the deviation rate DR, and the improvement rate IR of various impedance ratios R " R2. The filter assembly shown in Figure 14 has its perforated area blocked by only 50%. ' Table 4

315440 23 200418399

Table 5 Sample B (Vfs = 47.4%) Ri / Rz MR (%) ΔνΓ (%) DR (%) IR (*) 0 · 1 91.7 3.7 7 · 9 79.2 0.5 75.0 9.0 19.0 49.8 1 66.7 12.0 25.3 33.3 2 60.0 14.5 30.7 19.2 5 54.5 16.7 35.3 6.9 10 52.4 17.6 37.2 1.8 15 51.6 18.0 37.9 (DRb) 0.0 Table 6 Sample C (Vfs = 72.5%) Ri / R2 MR (%) △ vF (%) DR (%) IR (% ) 0.1 91.7 3.3 4.6 82.3 0.5 75.0 8.4 11.6 54.8 1 66.7 11.6 16.0 37.8 2 60.0 14.5 20.0 22.4 5 54 · 5 17.1 23.6 8.2 10 52.4 18.2 25.2 2.2 15 51.6 18.6 25.7 (DRb) 0.0 In Tables 4 to 6, deviation rates DR is expressed by the following formula.

The DR-Δ VF / VFN improvement rate IR is based on the deviation rate DR when the impedance ratio is 15 as the reference value DRb, and is expressed by the following formula. 24 315440 200418399 In the case of IR = l- (DR / DRB) x100, the ventilation resistance of the tip paper is expressed as Rt t and the ventilation resistance of the packaging material 31 is expressed in%, the impedance ratio is RT / Rj 丄 3 or so. From Tables 4 to 6, it can be seen that, for the surplus -θ ..., the sample mouths A to C, if the air permeability MR is 60/0 to 90%, and the Poyang rod 乂 n ^ resistance ratio 1VR2 is less than 2, then The A Vf value in the ventilation can be controlled to be sufficiently small, thereby achieving the aforementioned desired purpose. More ideally, it is difficult to maintain the permeability maintenance rate in the grasping system. . Even if the filter assembly containing a dual filter has an impedance ratio of 1 ^ 2 or less, the permeability maintenance rate MR is of course maintained at 60% to 90%. The dual filter 6 may include a replacement charcoal filter element. Other filter elements, which have other absorbing materials other than charcoal particles. Of course, the space layer 22 described above may be secured by embossing or other methods other than the paste layer. [Brief description of the drawings] FIG. 1 is an oblique view of a filter assembly according to an embodiment after being broken. Fig. 2 is a longitudinal sectional view schematically showing the dual filter of Fig. 1; Fig. 3 is a longitudinal view schematically showing a dual filter according to a modification. Π Figures 4 and 5 are diagrams of the internal structure of a conventional dual filter and the electrical circuit of the price search. 315440 25 200418399 Figures 6 and 7 are the internal and equivalent electrical circuit diagrams of the dual filter of the present invention. Figures 8 and 9 correspond to the schematic diagrams of the inflow state of Figures 4 and 5, respectively. Outside air

Figures 10 and 11 correspond to Figures 6 and 7, respectively, and are schematic diagrams of the state of airflow inflow. Fig. 12 is a graph showing the relationship between the ventilation resistance ratio R1 / R2 and the air volume deviation AVF of the filter stage. Figure 13 shows the relationship between the ventilation volume Vps of the filter unit and the ventilation level of the packaging material. & Figure 14 is a longitudinal sectional view schematically showing a part of a general filter. Fig. 15 is a longitudinal sectional view schematically showing a part of the non-lump filter.

2 6 12 16 22 26 Hi [Description of Symbols] Cigarette dual filter element Ordinary filter element Packaging material space layer (air layer) inside the perforation line R2 Ventilation resistance 4 Filter element 8 Wrap paper 14 Fibrous filter material 18 Outer packaging material 24 Perforated area 28, 2 8a, 2 8b Paste layer 26 315440

Claims (1)

200418399 Scope of patent application: 1 · A filter assembly for cigarettes, the filter assembly having one end connected to the cigarette smoke and the suction end, the filter assembly includes: a cylindrical filter, the filter includes A filter material for filtering tobacco smoke and a breathable outer layer covering the filter material and forming an outer peripheral surface of the tear filter; winding the filter to connect the filter to a wrapper of the cigarette; The wrapper paper has a perforated area that surrounds the outer surface of the filter, and makes outside air flow into the filter; and a tubular air permeability formed between the other wrapper paper and the filter material, γ, The air permeability determining band extends throughout the whole of the filter, and has the air permeability that more dominantly determines the air volume entering the outside of the filter material when smoking the cigarette than the perforation field. 2. The filter assembly according to item 1 of the scope of patent application, wherein the perforated field includes at least 丨 perforated rows formed in the wrapper paper, and the ^ perforated rows are spaced apart from each other in the circumferential direction of the dispenser. And arranged multiple perforations. 3. As described in the second item of the scope of the patent application; two, Nanyi △ μ ^, Bayi's filter is a component, wherein, in the state of the aforementioned -end blockage of the aforementioned transitional device component, the description from A of the aforementioned transitional device component is described. When i is sucked in and air is sucked in, the permeation area passes through the perforation area from the perforated area through the air permeability determination zone, and the ventilation volume inside and outside the filter material is expressed as VFN. The perforated area is not blocked by VFN. In the case of ventilation 315440 27 4 ^ the ventilation volume ^ 4 It is said that only 50% of the perforated area is blocked by the aforementioned ventilation: 1: The ventilation degree determination belt has a ventilation volume VFB. Ventilation from V °% to 9 °%. Filter assembly, which is divided into a spoon filter assembly, wherein the aforementioned filtering perforation area V is outside: the outer side of the wrapped / said breathability determination band and includes the above-mentioned percolate: adjacent: minus: and determined from the aforementioned aeration degree Bring to front ventilation resistance is shown in the following table: 'Asia and the outside and inside of the material is set to 2 or less. !! 'R2 时' ventilation resistance ratio Ri / R2 5. Second application: The filter assembly of item 3 of the patent scope, in which the aforementioned filter 2 cows' & are divided into the outer side of the bag and the temperament belt and include The outer part of the perforation entry domain and the inner part of the perforated wood from the air permeability determination, and when the air permeability of the outer and inner parts are respectively expressed as Ql and Q2, the deviation of the air permeability Δ (^ κ2, in the range of -2000 to 4000CU (CORESTA Unit). 6. If the filter assembly of the third item of the patent application, in the above, the inner part is formed only by the aforementioned permeability determination band, and the aforementioned permeability determination band includes the aforementioned The filter material is wrapped in a rod shape as the aforementioned outer packaging material and the space layer enveloping the aforementioned packaging material. 7. For the filter assembly of item 3 of the patent application scope, wherein the aforementioned inner part is only determined by the aforementioned air permeability determination band It is formed that the air permeability determining zone is formed by thermoforming the outer peripheral surface of the filter material, and includes the outer skin layer as the outer layer, and the space layer surrounding the outer skin layer. The filter assembly of item 3, the above-mentioned filter 315440 28 is' includes: 70 pieces of square ferrule elements with filtering on the axis of the cigarette, the inner packaging material of each filtering device; and the first and second types A kind of transition material, and wrapping the filter to wind the aforementioned first type and the outer side of the element. A kind of transition element to connect these transitions. For example, the eighth degree of the scope of patent application, including the front and rear components. 'Wherein' the aforementioned ventilating syrup-q dagger, and the air layer ensured between the aforementioned inner packaging material and the front outer packaging material. 10. For example, as described in the patent application scope No. 9 ^ filter state components, where The ventilation resistance ratio Ri / R2 of the above-mentioned threading 3 and KW wrapper tip paper and the above-mentioned outer bag = ventilation resistance is R1, and when the impedance of the inner package material is 112, the ratio of the ventilation resistance Ri / R2 is set to 2 or less. ⑴ For example, the transition device assembly of the 9th scope of the patent application, wherein the synthetic air permeability of the air permeability of the wrapper paper and the air permeability of the outer packaging material determined by the perforation field is Q], the inner packaging material The degree of ventilation is the deviation of the degree of ventilation on Q2. AQ = Ql_Q2, which is in the range of 2,000 to 4,000 Cu (COHESTA Unit). I2. If the filter assembly of the patent application No. π, where The degree of air Q] is higher than the degree of air q2. 1 3 · As for the filter assembly of the item 12 of the patent application, where the degree of air Q2 is in the range of 100 to 5000 (CORESTA Unit). 14. As the item 8 of the patent application The filter assembly, wherein the aforementioned air permeability tape includes the aforementioned outer packaging material, and an air layer secured between the aforementioned outer packaging material and the first 29 315440 200418399 :. Determined by the perforation field: Second, the Λ transdermal component, which makes the ventilation resistance of the aforementioned outer packaging material ^ = the ventilation resistance of the paper is R], and the aforementioned ventilation resistance is: Close it. 2 1 The ratio of rolling resistance IVR2 is set to 2 1 6 · For example, the patent application of the rib-enclosed hole 11 ^ 11 component, wherein the air permeability of the aforementioned wrapping paper determined by the aforementioned penetration and the aforementioned outer packaging material μ become the air permeability. For Qi ', the air permeability of the aforementioned inner packaging material is Q2%, and the deviation of the air permeability is in the range of -2000 to (COHESTA Unit). 17. The filter assembly according to item 6 of the patent application scope, wherein the air permeability Q] is higher than the air permeability q2. 18. The filter assembly according to item 16 of the scope of patent application, wherein the air permeability Q2 is in the range of 100 to 5000 (CORESTA Unit). 30 315440