COOLING FILTER ROD AND APPLICATION THEREOF

Abstract

A cooling filter rod and an application thereof are disclosed. The filter rod comprises a hollow tube (1). The inside of the hollow tube (1) is provided with at least one plate (2) which partition the inside of the hollow tube and is perpendicular to the axis of the hollow tube (1). The area of the plate (2) is the same as the cross-sectional area of a hollow portion of the hollow tube (1) Each plate (2) is independently provided with at least one through hole (3). The cooling filter rod reduces the adsorption of cigarette smoke, greatly lowers the smoke temperature felt by mouth, improves the sensory quality of cigarettes, and is suitable for application in new heat-not-burn cigarettes.

Claims

1-15. (canceled)

16. A cooling filter rod, comprising: a hollow tube, wherein: the inside of the hollow tube is provided with at least one plate which partitions the inside of the hollow tube and is perpendicular to the axis of the hollow tube, and each plate is provided with one to six through-holes.

17. The cooling filter rod according to claim 16, wherein: the hollow tube is a hollow round tube, and the area of the plate is the same as the cross-sectional area of a hollow portion of the hollow round tube.

18. The cooling filter rod according to claim 16, wherein: the hollow tube has a length of about 10 to about 40 mm, and the inside of the hollow tube is provided with one to six plates.

19. The cooling filter rod according to claim 16, wherein the distance between any plate inside the hollow tube and any of two end ports of the hollow tube is not less than about 2 mm.

20. The cooling filter rod according to claim 16, wherein: the inside of the hollow tube is provided with two to six plates, and the distance between any two adjacent plates is within a range of about 2 to about 10 mm.

21. The cooling filter rod according to claim 16, wherein each plate has a thickness of about 0.5 to about 3 mm.

22. The cooling filter rod according to claim 16, wherein the through hole on each plate is arranged within a range of about 0 to about 3.0 mm from the center of the plate.

23. The cooling filter rod according to claim 16, wherein: the relative positions of the through-holes on the two adjacent plates are randomly distributed; or the through holes on the two adjacent plates are at the same positions or distributed symmetrically around the central axis of the plates.

24. The cooling filter rod according to claim 16, wherein: the through hole on the each plate is randomly distributed within a range of about 0 to about 3.0 mm from the center of the plate; or the through holes on the same plate are uniformly distributed according to a geometric figure, comprising one of a triangle, a square, or a polygon.

25. The cooling filter rod according to claim 16, wherein the through-holes are in the shape of at least one of circle, regular polygon, leaf, and heart.

26. The cooling filter rod according to claim 16, wherein the cross-sectional area of the through hole is about 0.2 to about 3.14 mm.sup.2.

27. The cooling filter rod according to claim 16, wherein the through-hole is circular, with a diameter of about 0.7 to about 2 mm.

28. A cigarette filter, comprising a cooling filter rod, wherein the cooling filter rod comprises: a hollow tube, wherein: the inside of the hollow tube is provided with at least one plate which partitions the inside of the hollow tube and is perpendicular to the axis of the hollow tube, and each plate is provided with one to six through holes.

29. The cigarette filter according to claim 28, further comprising: at least one of a cellulose acetate filter rod, a cut tobacco filter rod, and a particulate filter rod, wherein the at least one of a cellulose acetate filter rod, a cut tobacco filter rod, and a particulate filter rod is combinable with the cooling filter rod to form a binary or multiple composite cigarette filter.

30. The cigarette filter according to claim 28, wherein the cigarette filter is a new heat-not-burn cigarette filter.

31. A preparation method of a cooling filter rod, comprising: preparing a mold of hollow semi-cylinder with a plate having a through-hole thereon, dividing non-circular surfaces into two types: a “male” non-circular surface and a “female” non-circular surface, distributing slivers protruding forward and having a length of about 0.5 to about 1 mm and a thickness of about 0.1 to about 0.5 mm on a cylindrical end face and an end face of the plate on the “male” non-circular surface, and distributing clamping grooves having a length of about 0.5 to about 1 mm and a thickness of about 0.1 to about 0.5 mm correspondingly on a cylindrical end face and an end face of the plate on the “female” non-circular surface; performing injection molding, locking the hollow semi-cylinder having a “male” non-circular surface with the hollow semi-cylinder having a “female” non-circular surface by buckling to form a complete cylindrical cooling filter rod, and cutting into suitable lengths of filter rods for cigarettes or for compounding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a schematic structural diagram of a filter rod according to the present invention;

[0045] FIG. 2 is a schematic structural diagram of another filter rod according to the present invention;

[0046] FIG. 3 is a schematic structural diagram of still another filter rod according to the present invention;

[0047] FIG. 4 is a schematic structural diagram of still another filter rod according to the present invention;

[0048] FIG. 5 is a schematic structural diagram of a composite filter rod according to the present invention;

[0049] FIG. 6 is a schematic structural diagram of another composite filter rod according to the present invention;

[0050] In which: 1 hollow tube, 2 plate, 3 through hole, 4 cellulose acetate filter rod.

DETAILED DESCRIPTION OF EMBODIMENTS

[0051] The following embodiments are to further illustrate the present invention, but not to limit the protection scope of the present invention.

Embodiments 1-3

[0052] The following three kinds of filter rods with a length of 30 mm and a circumference of 24.0 mm are prepared first:

[0053] One of them is a hollow cylindrical filter rod with four plates which partition the inside of the hollow tube and circular through holes on each plate, every hollow cylinder has a thickness of 0.8 mm, and every plate has a thickness of 0.8 mm. Each plate has two or three through holes. The first plate is 4 mm from the mouth end and has two through holes thereon, the second plate is 12 mm from the mouth end and has three through holes thereon, the third plate is 16 mm from the mouth end and has two through holes thereon, and the fourth plate is 24 mm from the mouth end and has three through holes thereon. The centers of the through holes are randomly distributed within a range of 0 to 2.5 mm from the center of the plate, and every through hole has a diameter of 1.5 mm.

[0054] This filter rod is denoted as 3# (as shown in FIG. 3).

[0055] The other two are binary composite filter rods, and their composite structures are both compounded of a 20 mm long hollow cylindrical filter rod and a 10 mm long cellulose acetate filter rod near the lip end, the 20 mm long hollow cylindrical filter rod has a plate which partitions the inside of the hollow tube, the plate has a circular through hole thereon. One of the binary composite filter rods includes one plate, the hollow cylinder has a thickness of 1.5 mm, the plate has a thickness of 2 mm and is provided with one through hole, the through hole is in the center of the cross-sectional circle of the filter rod and has a diameter of 1.5 mm, the plate is 10 mm from the mouth end, and this filter rod is denoted as 5# (as shown in FIG. 5). The other binary composite filter rod includes four plates, each throttling plate has four circular through holes, the center of each through hole is 2 mm from the center of the cross-sectional circle of the filter rod, the four through holes are distributed in a square shape on the cross-sectional circle of the filter rod, the through holes on the adjacent plates are at the same positions, every through hole has a diameter of 1 mm, both of the outer wall of the hollow cylinder and each plate have a thickness of 0.8 mm, the distances between the first plate and the mouth end and between the adjacent plates are both 4 mm, and this filter rod is denoted as 6# (as shown in FIG. 6).

Comparative Examples 1-2

[0056] A cylindrical hollow tube type cellulose acetate composite filter rod with the same length of 30 mm and the same circumference of 24.0 mm as those of the filter rods in Embodiments 1-3, it does not have plate which partitions the inside of the hollow tube and is denoted as 0A#, its composite structure is composed of a 10 mm long cellulose acetate filter rod and a 20 mm long hollow filter rod, and the cellulose acetate filter rod is near the lip end. An ordinary cellulose acetate filter rod with the same length of 30 mm and the same circumference of 24.0 mm as those of the filter rods in Embodiments 1-3 is denoted as 0B#.

[0057] The above five kinds of filter rods are respectively rolled with cigarettes of the same technical formula into new heat-not-burn cigarettes with a length of 48 mm and a circumference of 24.3 mm. The cigarettes are numbered identically to the number of the filter rods. The cigarettes are heated by the same smoking set, the maximum heating temperature is 350° C., the cigarettes are smoked according to the ISO standard method, the maximum smoke temperatures at the lip ends of the outer edges of the filters are tested, and the smoke results are shown in Table 1:

TABLE-US-00001 TABLE 1 Maximum smoke Cigarette temperature Tar Nicotine number (lip end) (° C.) (mg) (mg) 3# 51 2.2 0.65 5# 73 1.4 0.35 6# 59 1.6 0.37 0A# 86 1.3 0.32 0B# 79 0.5 0.13

[0058] It can be seen from Table 1 that the 3#, 5# and 6# filter rods are applied to the new heat-not-burn cigarettes with the circumference of 24.3 mm; and compared with the ordinary cellulose acetate filter rod 0B#, the maximum temperatures of smoke at the lip ends of the outer edges of the measured filters are greatly lowered, and the tar and nicotine in the smoke are greatly increased.

[0059] The 3# filter rod is applied to the new heat-not-burn cigarette with the circumference of 24.3 mm; and compared with the cellulose acetate hollow tube composite filter rod 0A#, the maximum temperature of smoke at the lip end of the outer edge of the filter is greatly lowered, and the ingredients such as tar and nicotine in the smoke are greatly increased. Compared with the cellulose acetate hollow tube binary composite filter rod 0A#, the application of the 5# and 6# filter rods achieves that the maximum temperatures of smoke at the lip ends of the outer edges of the measured filters are also obviously lowered, and the differences in tar and nicotine in the smoke are small.

[0060] Moreover, during the cigarette smoking process of the 0A# and 0B# filter rods, the bad phenomenon of agglomeration formed by melting shrinkage occurs on the sides of the cellulose acetate filter rods close to the heating zones of the smoking sets under the influence of high-temperature smoke, so that the suction resistance increases and the amount of smoke decreases significantly from the third puff or even the second puff.

[0061] This phenomenon is more serious in the 0B# cellulose acetate filter rod, but not obvious in the 5# and 6# composite filter rods having the effect of lowering the temperature of smoke.

[0062] The filter rod of the present invention greatly lowers the maximum temperature of smoke at the lip end of the outer edge of the filter while reducing the absorption of cigarette smoke. The entrapment and adsorption of smoke of the new heat-not-burn cigarette by the cigarette filter rod are effectively reduced, the temperature of the cigarette smoke felt by mouth is lowered, the sensory quality of the cigarette is improved, and the consumers' satisfaction is improved.

Embodiments 4-5

[0063] The following two kinds of filter rods with a length of 30 mm and a circumference of 16.8 mm are prepared first:

[0064] One of them is a hollow cylindrical filter rod with four plates which partition the inside of the hollow tube, and there are circular through holes on each plate, every hollow cylinder has a thickness of 0.8 mm, and every plate has a thickness of 0.8 mm. Each plate has two or three through holes. The first plate is 4 mm from the mouth end and has two through holes thereon, the second plate is 12 mm from the mouth end and has three through holes thereon, the third plate is 16 mm from the mouth end and has two through holes thereon, and the fourth plate is 24 mm from the mouth end and has three through holes thereon. The centers of the through holes are randomly distributed within a range of 0 to 1.2 mm from the center of the plate, and the through holes have a diameter of 1 mm. This filter rod is denoted as 9#.

[0065] The other is a binary composite filter rod, and its composite structure is compounded of a 20 mm long hollow cylindrical filter rod and a 10 mm long cellulose acetate filter rod near the lip end, the 20 mm long hollow cylindrical filter rod has a plate which partitions the inside of the hollow tube, the plate has a circular through hole thereon. The binary composite filter rod includes one plate, the hollow cylinder has a thickness of 1.5 mm, the plate has a thickness of 2 mm and is provided with one through hole, the through hole is in the center of the cross-sectional circle of the filter rod and has a diameter of 1.5 mm, and the plate is 10 mm from the mouth end. This binary composite filter rod is denoted as 11#.

Comparative Examples 3-4

[0066] A cylindrical hollow tube type cellulose acetate composite filter rod with the same length of 30 mm and the same circumference of 16.8 mm as the filter rods in Embodiments 4-5, it does not have plate which partitions the inside of the hollow tube and is denoted as 0C#, its composite structure is composed of a 10 mm long cellulose acetate filter rod and a 20 mm long hollow filter rod, and the cellulose acetate filter rod is near the lip end. An ordinary cellulose acetate filter rod with the same length of 30 mm and the same circumference of 16.8 mm is denoted as 0D#.

[0067] The above four kinds of filter rods are respectively rolled with cigarettes of the same technical formula into new fine heat-not-burn cigarettes with a length of 70 mm and a circumference of 17.1 mm. The cigarettes are numbered identically to the number of the filter rods. The new fine cigarettes are heated by the same smoking set, the maximum heating temperature is 230° C., the cigarettes are smoked according to the ISO standard method, the maximum smoke temperatures at the lip ends of the outer edges of the filters are tested, and the smoke results are shown in Table 2:

TABLE-US-00002 TABLE 2 Maximum smoke Cigarette temperature Tar Nicotine number (lip end) (° C.) (mg) (mg)  9# 56 4.7 0.28 11# 67 3.2 0.13  0C# 79 3.2 0.12  0D# 70 1.2 0.05

[0068] It can be seen from Table 2 that the 9# and 11# filter rods are applied to the new heat-not-burn cigarettes with the circumference of 17.1 mm; and compared with the ordinary cellulose acetate filter rod 0D#, the maximum temperatures of smoke at the lip ends of the outer edges of the filters are greatly lowered, and the tar, nicotine and moisture in the smoke are greatly increased.

[0069] The 9# filter rod is applied to the new heat-not-burn cigarette with the circumference of 17.1 mm; and compared with the cellulose acetate hollow tube composite filter rod 0C#, the maximum temperature of smoke at the lip end of the outer edge of the filter is greatly lowered, and the tar and nicotine in the smoke are greatly increased. Compared with the cellulose acetate hollow tube binary composite filter rod 0C#, the application of the 11# filter rod achieves that the maximum temperature of smoke at the lip end of the outer edge of the filter is also obviously lowered, and the differences in tar and nicotine in the smoke are small. Moreover, during the cigarette smoking process of the 0C# and 0D# filter rods, the bad phenomenon of agglomeration formed by melting shrinkage occurs on the sides of the cellulose acetate filter rods close to the heating zones of the smoking sets under the influence of high-temperature smoke, so that the suction resistance increases and the amount of smoke decreases significantly from the third puff or even the second puff. This phenomenon is more serious in the 0D# cellulose acetate filter rod, but not obvious in the 11# composite filter rod having the effect of lowering the temperature of smoke.

Embodiments 6-12

[0070] The following seven kinds of filter rods with a length of 34 mm and a circumference of 22.0 mm are prepared first:

[0071] Three of them are hollow cylindrical filter rods with four plates which partition the inside of the hollow tube, and the plate has a circular through hole thereon, every hollow cylinder has a thickness of 0.8 mm, and every plate has a thickness of 0.8 mm.

[0072] In the first one of the three hollow cylindrical filter rods, each plate has one through hole, the center of the through hole is 2 mm from the center of the cross-sectional circle of the filter rod, the through holes on the adjacent plates are symmetrically distributed around the center of the circle, the through holes on any two plates, which are separated by another plate, are at the same positions, the through holes have a diameter of 1.2 mm, the distances between the first plate and the mouth end and between the adjacent plates are both 6 mm, and this filter rod is denoted as A1# (as shown in FIG. 1); in the second one of the three hollow cylindrical filter rods, each plate has two circular through holes, one of the through holes is in the center of the cross-sectional circle of the filter rod, the center of the other through hole is 2 mm from the center of the cross-sectional circle of the filter rod, the through holes on the adjacent plates are symmetrically distributed around the center of the circle, the through holes on any two plates, which are separated by another plate, are at the same positions, every through hole has a diameter of 1.0 mm, the distances between the first plate and the mouth end and between the adjacent plates are both 6 mm, and this filter rod is denoted as A2# (as shown in FIG. 2); and in the third one of the three hollow cylindrical filter rods, each plate has two or three through holes, the first plate is 4 mm from the mouth end and has two through holes thereon, the second plate is 12 mm from the mouth end and has three through holes thereon, the third plate is 16 mm from the mouth end and has two through holes thereon, the fourth plate is 24 mm from the mouth end and has three through holes thereon, the centers of the through holes are randomly distributed within a range of 0 to 2.1 mm from the center of the plate, every through hole has a diameter of 1.0 mm, and this filter rod is denoted as A3# (as shown in FIG. 3).

[0073] The other one in the seven kinds of filter rods is a hollow cylindrical filter rod with three plates which partition the inside of the hollow tube and circular through holes on each plate, the hollow cylinder has a thickness of 0.8 mm, and every plate has a thickness of 0.8 mm. Each plate has three through holes, the centers of the through holes are on one side of the center of the cross-sectional circle of the filter rod and are 2 mm from the center of the cross-sectional circle of the filter rod, the through holes are triangularly distributed, the through holes on the adjacent plates are symmetrically distributed around the center of the circle, the through holes on any two plates, which are separated by another plate, are at the same positions, the through holes have a diameter of 1.0 mm, the first plate is 4 mm from the mouth end, and the distance between the adjacent plates is 10 mm. This filter rod is denoted as A4# (As shown in FIG. 4).

[0074] The other two in the seven kinds of filter rods are binary composite filter rods, and their composite structures are both compounded of a 27 mm long hollow cylindrical filter rod and a 7 mm long cellulose acetate filter rod near the lip end, the 27 mm long hollow cylindrical filter rod has a plate which partitions the inside of the hollow tube, the plate has a circular through hole thereon. One of the binary composite filter rods includes one plate, the hollow cylinder has a thickness of 1.5 mm, the plate has a thickness of 2 mm and is provided with one through hole, the through hole is in the center of the cross-sectional circle of the filter rod and has a diameter of 1.2 mm, the plate is 8 mm from the cellulose acetate filter rod, and this filter rod is denoted as A5# (as shown in FIG. 5). The other binary composite filter rod includes four plates, each throttling plate has four circular through holes, the center of each through hole is 2 mm from the cross-sectional circle of the filter rod, the four through holes are distributed in a square shape on the cross-sectional circle of the filter rod, the through holes on the adjacent plates are at the same positions, every through hole has a diameter of 0.9 mm, both of the outer wall of the hollow cylinder and each plate have a thickness of 0.8 mm, the distances between the first plate and the cellulose acetate filter rod and between the adjacent plates are both 4 mm, and this filter rod is denoted as A6# (as shown in FIG. 6).

[0075] Another binary composite filter rod is prepared, and its composite structure is compounded of a 27 mm long hollow cylindrical filter rod and a 7 mm long cellulose acetate filter rod near the lip end, the 27 mm long hollow cylindrical filter rod has a plate which partitions the inside of the hollow tube, the plate has a circular through hole thereon. The hollow cylindrical filter rod includes four plates, the hollow cylinder has a thickness of 0.8 mm, the plate has a thickness of 0.8 mm, each plate has one through hole, the through hole is in the center of the cross-sectional circle of the filter rod and has a diameter of 2.5 mm, and the distances between the first plate and the mouth end and between the adjacent plates are both 4 mm. This filter rod is denoted as F1#.

Comparative Example 5

[0076] A cylindrical hollow tube type cellulose acetate composite filter rod with the same length of 34 mm and the same circumference of 22.0 mm, the filter rod does not have plate which partitions the inside of the hollow tube and is denoted as A0#, its composite structure is composed of a 7 mm long cellulose acetate filter rod and a 27 mm long hollow filter rod, and the cellulose acetate filter rod is near the lip end.

[0077] The above eight kinds of filter rods are respectively rolled with cigarettes of the same technical formula into new heat-not-burn cigarettes with a length of 46 mm and a circumference of 22.6 mm. The cigarettes are numbered identically to the number of the filter rods. The cigarettes are heated by the same smoking set, the maximum heating temperature is 300-350° C., the cigarettes are smoked according to the ISO standard method, the maximum smoke temperatures at the lip ends of the outer edges of the filters are tested, and the smoke results are shown in Table 3:

TABLE-US-00003 TABLE 3 Maximum smoke Cigarette temperature Tar Nicotine number (lip end) (° C.) (mg) (mg) A1# 62 3.1 0.55 A2# 51 3.2 0.61 A3# 54 3.4 0.65 A4# 56 3.4 0.66 A5# 75 2.1 0.34 A6# 58 2.3 0.37 F1# 89 1.9 0.31 A0# 88 1.9 0.30

[0078] As can be seen from Table 3, the A1#, A2#, A3# and A4# filter rods are applied to the new heat-not-burn cigarettes with the circumference of 22.6 mm; and compared with the cellulose acetate hollow tube composite filter rod A0#, the maximum temperatures of smoke at the lip ends of the outer edges of the filters are greatly lowered, and the ingredients such as tar and nicotine in the smoke are greatly increased. Compared with the cellulose acetate hollow tube composite filter rod A0#, the application of the 5# and 6# filter rods achieves that the maximum temperatures of smoke at the lip ends of the outer edges of the measured filters are also obviously lowered, and the differences in tar and nicotine in the smoke are small.

[0079] Moreover, during the cigarette smoking process of the A0# filter rod, the bad phenomenon of agglomeration formed by melting shrinkage occurs on the side of the cellulose acetate filter rod close to the heating zone of the smoking set under the influence of high-temperature smoke, so that the suction resistance increases and the amount of smoke decreases significantly from the third puff or even the second puff.

[0080] Because the 5# and 6# composite filter rods can effectively lower the temperature of smoke, the bad phenomenon of agglomeration formed by melting shrinkage is not obvious on the cellulose acetate filter rod.

[0081] During the cigarette smoking process, because the diameter of the through holes is too large, the smoking characteristics of the F1# filter rod are close to those of the A0# filter rod, and the maximum temperature of smoke at the lip end of the outer edge of the measured filter is not effectively lowered. The bad phenomenon of agglomeration formed by melting shrinkage also occurs on the cellulose acetate filter rod.

Embodiments 13-19

[0082] The following seven kinds of filter rods with a length of 30 mm and a circumference of 16.8 mm are prepared first:

[0083] Two of them are hollow cylindrical filter rods with four plates which partition the inside of the hollow tube and a circular through hole on each plate, every hollow cylinder has a thickness of 0.8 mm, and every plate has a thickness of 0.8 mm. In the first hollow cylindrical filter rod, each plate has one through hole, the center of the through hole is 1 mm from the center of the cross-sectional circle of the filter rod, the through holes on the adjacent plates are symmetrically distributed around the center of the circle, the through holes on any two plates, which are separated by another plate, are at the same positions, the through holes have a diameter of 1.2 mm, the distances between the first plate and the mouth end and between the adjacent plates are both 6 mm, and this filter rod is denoted as B1#; and in the second hollow cylindrical filter rod, each plate has two circular through holes, the centers of the through holes are randomly distributed within a range of 0 to 1.2 mm from the center of the plate, the through holes have a diameter of 1 mm, the distances between the first plate and the mouth end and between the adjacent plates are both 6 mm, and this filter rod is denoted as B2#.

[0084] The third one in the seven kinds of filter rods is a hollow cylindrical filter rod with five plates which partition the inside of the hollow tube and a circular through hole on each plate, every hollow cylinder has a thickness of 0.7 mm, and every plate has a thickness of 1 mm. Each plate has two or three circular through holes. The first plate is 4 mm from the mouth end and has two through holes thereon, the second plate is 8 mm from the mouth end and has three through holes thereon, the third plate is 12 mm from the mouth end and has two through holes thereon, the fourth plate is 20 mm from the mouth end and has three through holes thereon, and the fifth plate is 24 mm from the mouth end and has two through holes thereon. The centers of the through holes are randomly distributed within a range of 0 to 1.4 mm from the center of the plate, and the through holes have a diameter of 0.9 mm. This filter rod is denoted as B3#.

[0085] The other one in the seven kinds of filter rods is a hollow cylindrical filter rod with three plates which partition the inside of the hollow tube and a circular through hole on each plate, every hollow cylinder has a thickness of 0.8 mm, and every plate has a thickness of 0.8 mm. Each plate has three through holes, the centers of the through holes are 1.2 mm from the center of the cross-sectional circle of the filter rod and are triangularly distributed, the through holes on the adjacent plates are symmetrically distributed around the center of the circle, the through holes on any two plates, which are separated by another plate, are at the same positions, the through holes have a diameter of 0.8 mm, the first plate is 4 mm from the mouth end, and the distance between the adjacent plates is 10 mm. This filter rod is denoted as B4#.

[0086] The other two in the seven kinds of filter rods are binary composite filter rods, and their composite structures are both compounded of a 23 mm long hollow cylindrical filter rod and a 7 mm long cellulose acetate filter rod near the lip end, the 23 mm long hollow cylindrical filter rod has a plate which partitions the inside of the hollow tube and has a circular through hole thereon; one of the binary composite filter rods includes one plate, the hollow cylinder has a thickness of 1.5 mm, the plate has a thickness of 2 mm and is provided with one through hole, the through hole is in the center of the cross-sectional circle of the filter rod and has a diameter of 1 mm, the plate is 8 mm from the cellulose acetate filter rod, and this filter rod is denoted as B5#; and the other binary composite filter rod includes four plates, each plate has four through holes, the center of each through hole is 1.2 mm from the cross-sectional circle of the filter rod, the four through holes are distributed in a square shape on the cross-sectional circle of the filter rod, the through holes on the adjacent plates are at the same positions, every through hole has a diameter of 0.8 mm, the outer wall of the hollow cylinder and each plate both have a thickness of 0.8 mm, the distances between the first plate and the cellulose acetate filter rod and between the adjacent plates are both 4 mm, and this filter rod is denoted as B6#.

[0087] Another binary composite filter rod is prepared, and its composite structure is compounded of a 23 mm long hollow cylindrical filter rod and a 7 mm long cellulose acetate filter rod near the lip end, the 23 mm long hollow cylindrical filter rod has a plate which partitions the inside of the hollow tube and has a circular through hole thereon. The hollow cylindrical filter rod has one plate, the plate is 6 mm from the cellulose acetate filter rod, the hollow cylinder has a thickness of 0.8 mm, the plate has a thickness of 1 mm and is provided with six through holes, the centers of the through holes are randomly distributed within a range of 0 to 1.5 mm from the center of the plate, and the through holes have a diameter of 0.4 mm. This filter rod is denoted as F2#.

Comparative Example 6

[0088] A cylindrical hollow tube type cellulose acetate composite filter rod with the same length of 30 mm and the same circumference of 16.8 mm, the filter rod does not have plate which partitions the inside of the hollow tube and is denoted as B0#, its composite structure is composed of a 7 mm long cellulose acetate filter rod and a 23 mm long hollow filter rod, and the cellulose acetate filter rod is near the lip end.

[0089] The above eight kinds of filter rods are respectively rolled with cigarettes of the same technical formula into new fine heat-not-burn cigarettes with a length of 72 mm and a circumference of 17.1 mm. The cigarettes are numbered identically to the number of the filter rods. The new fine cigarettes are heated by the same smoking set, the maximum heating temperature is 230-280° C., the cigarettes are smoked according to the ISO standard method, the maximum smoke temperatures at the lip ends of the outer edges of the filters are tested, and the smoke results are shown in Table 4:

TABLE-US-00004 TABLE 4 Maximum smoke Cigarette temperature Tar Nicotine number (lip end) (° C.) (mg) (mg) B1# 63 4.5 0.27 B2# 55 4.8 0.27 B3# 52 5.1 0.33 B4# 57 4.9 0.31 B5# 68 3.0 0.18 B6# 61 3.3 0.20 F2# 32 0.3 0.02 B0# 81 3.0 0.17

[0090] As can be seen from Table 4, the B1#, B2#, B3# and B4# filter rods are applied to the new heat-not-burn cigarettes with the circumference of 17.1 mm; and compared with the cellulose acetate hollow tube composite filter rod B0#, the maximum temperatures of smoke at the lip ends of the outer edges of the filters are greatly lowered, and the tar and nicotine in the smoke are greatly increased. Compared with the cellulose acetate hollow tube composite filter rod B0#, the application of the B5# and B6# filter rods achieves that the maximum temperatures of smoke at the lip ends of the outer edges of the filters are also obviously lowered, and the differences in tar and nicotine in the smoke are small.

[0091] Regarding the F2# filter rod, during the cigarette smoking process, because the diameter of the through hole is too small, although the maximum temperature of smoke at the lip end of the outer edge of the measured filter is relatively low, the amount of smoke is too small during smoking, the tar and nicotine in the smoke are too low, the suction resistance will be large and the feeling of empty smoking will be obvious.

[0092] Moreover, during the cigarette smoking process of the B0# filter rod, the bad phenomenon of agglomeration formed by melting shrinkage occurs on the side of the cellulose acetate filter rod close to the heating zone of the smoking set under the influence of high-temperature smoke, so that the suction resistance increases and the amount of smoke decreases significantly from the third puff or even the second puff.

[0093] Because the B5# and B6# composite filter rods can effectively lower the temperature of smoke, the bad phenomenon of agglomeration formed by melting shrinkage is not obvious on the cellulose acetate filter rod.

[0094] The cooling filter rod of the present invention lowers the maximum temperature of smoke at the lip end of the outer edge of the filter while reducing the absorption of cigarette smoke. The entrapment and adsorption of smoke of the new heat-not-burn cigarette by the cigarette filter rod are effectively reduced, the temperature of the cigarette smoke felt by mouth is lowered, the sensory quality of the cigarette is improved, and the consumers' satisfaction is improved.