阅读说明：本技术 一种具有降温功能的复合滤嘴棒及其应用 (Composite filter tip rod with cooling function and application thereof ) 是由 刘华 王东方 黄治 丁康钟 李曦 曾天一 何蓉 齐延鹏 吴金凤 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种具有降温功能的复合滤嘴棒及其应用,涉及卷烟滤棒技术领域,一种具有降温功能的复合滤嘴棒,所述滤嘴棒设置有中空管段,所述滤嘴棒上于靠近中空管段远离卷烟烟丝的一端开设有若干通气孔,若干所述通气孔沿着滤嘴棒的圆周均匀排列,且若干所述通气孔均设置于同一水平面上,所述滤嘴棒还包括异形过滤段,所述异形过滤段设置有一个或多个贯穿异形过滤段两端的孔道。本发明的一种具有降温功能的复合滤嘴棒,通过设置的中空管段和通气孔相配合,利用文丘里效应,将外界空气吸入滤嘴棒内,达到降低烟气温度的效果。(The invention discloses a composite filter rod with a cooling function and application thereof, and relates to the technical field of cigarette filter sticks. According to the composite filter tip rod with the cooling function, the hollow pipe section is matched with the vent hole, and external air is sucked into the filter tip rod by utilizing the Venturi effect, so that the effect of reducing the temperature of smoke is achieved.)

1. The composite filter tip with the cooling function is characterized in that the filter tip is provided with a hollow pipe section, and a plurality of vent holes are formed in one end, close to the hollow pipe section, of the filter tip, and far away from cigarette tobacco shreds.

2. The composite filter rod with the cooling function as claimed in claim 1, wherein the plurality of vent holes are divided into one or more rows which are uniformly arranged along the circumference of the filter rod, and each row of vent holes are arranged on the same horizontal plane.

3. The composite filter rod with the cooling function as claimed in claim 2, wherein the shortest distance between the vent hole and the hollow pipe section is 1-2mm in size.

4. The composite filter rod with the cooling function as claimed in claim 3, wherein the filter rod further comprises a special-shaped filter section, and the special-shaped filter section is provided with one or more pore passages penetrating through two ends of the special-shaped filter section.

5. The composite filter tip rod with the cooling function as claimed in claim 4, wherein the filter tip rod further comprises an acetate fiber filtering section, one end of the hollow pipe section is connected with the acetate fiber filtering section, the other end of the hollow pipe section is connected with the special-shaped filtering section, the acetate fiber filtering section, the hollow pipe section and the special-shaped filtering section are wrapped with forming paper, and the vent hole is formed in the position, corresponding to the acetate fiber filtering section, on the forming paper.

6. The composite filter tip rod with the cooling function as claimed in claim 4, wherein the filter tip rod further comprises an acetate fiber filtering section, one end of the special-shaped filtering section is connected with the acetate fiber filtering section, the other end of the special-shaped filtering section is connected with the hollow pipe section, the acetate fiber filtering section, the hollow pipe section and the special-shaped filtering section are wrapped with forming paper, and the vent hole is formed in the position, corresponding to the special-shaped filtering section, on the forming paper.

7. The composite filter rod with the cooling function according to any one of claims 3 to 6, wherein the surface of the special-shaped filter segment is provided with one or more pore channels.

8. The composite filter tip rod with the cooling function as claimed in claim 7, wherein the cross section of the pore channel is of a triangular structure, and the cross section of the special-shaped filter section is of a gear-shaped structure.

9. The composite filter rod with the function of reducing the temperature according to any one of claims 3 to 6, wherein the hollow tube section is a paper tube with a microporous structure, and the paper tube is made of waste paper pulp, heat-conducting particles and phase-change heat-absorbing microcapsules as raw materials through drying and molding.

10. Use of a composite filter rod with a cooling function in a cigarette or a non-combustible cigarette according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of cigarette filter sticks, in particular to a composite filter stick with a cooling function and application thereof.

Background

The cigarette without burning is heated in a sealed manner instead of burning so that tobacco components are distilled and cracked to release smoke, the heating temperature is 200-400 ℃, harmful components generated by heating the cigarette without burning are reduced, smoldering is avoided, the release amount of the harmful components is relatively low, and meanwhile, the released smoke volume and the smoke concentration are relatively low. In order to meet the requirements of smokers, the cigarettes are generally shorter in length and lower in smoke resistance so as to improve the mouth feel of smoke in the mouth. The literature indicates that the temperature of the smoke of the traditional cigarette is reduced after the smoke is filtered by a tobacco rod and a filter stick before being inhaled into the oral cavity of a consumer, but the temperature of the mainstream smoke reaching the oral cavity can still reach 35-90 ℃, the maximum temperature of the smoke at the filter end can reach 70-80 ℃ when the smoking is close to the first 2-3 mouths of the smoking, the maximum temperature of the smoke at the filter end can reach about 100 ℃ in a deep smoking mode, the mainstream smoke temperature of the cigarette without the filter stick can be improved by about 28%, the consumer does not feel scorching because the smoke is relatively dry, and the aerosol generated by heating the cigarette without burning is lower in temperature, but the heating temperature is low, the water content of the smoke is high, the smoke passage is shortened, and the sensory temperature of the mainstream smoke reaching the oral cavity is higher than that of the traditional cigarette.

Generally, in the same reference state, the enthalpy of solid, liquid and gas states of the same substance is sequentially increased, that is, the heat energy content is sequentially increased, that is, the sensory temperature of a human body is sequentially increased when solid, liquid and gas with the same temperature are ingested, so that a certain burning sensation is generated when a consumer inhales and heats a non-combustible cigarette, certain damage is caused to the oral viscosity, tracheal mucosa and the like of the consumer, and the burning sensation is more serious due to further shortening of the smoke heat exchange time in the later stage of cigarette smoking, thereby influencing the smoking quality of the cigarette. At present, a great deal of research is carried out at home and abroad, and the cooling measures are mainly focused on two aspects of adding cooling materials and designing cooling structures.

The existing cigarette smoke cooling method mostly adopts a mode of adding an inhalation material into a filter tip. For example, the existing proprietary name is 'a hollow supporting element containing a hollow cooling part and a cigarette containing the hollow supporting element', and the patent number is 'CN 110250560A'; the patent name is 'a polylactic acid wire material composite molding filter rod', and the patent number is 'CN 109846084A'; the filter stick is added with polylactic acid, polyethylene, bead blasting, gel and other main heat absorption cooling materials, but the materials are easy to collapse in the using process and influence the using experience of a user, and as for the traditional Chinese invention patent with the patent name of 'a cooling filter stick, a smoking product and application', the patent number of CN109588771B, the mode of coating the phase change material in the filter stick is adopted, but in the process of smoking cigarettes, smoke can be in direct contact with the coated phase change material, and after the phase change material is subjected to phase change, the smoke is inevitably carried in the smoke and the taste of the smoke is influenced, and even the body health can be influenced.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a composite filter rod with a cooling function and an application thereof, wherein the hollow pipe section is matched with the vent hole, and the venturi effect is utilized to suck outside air into the filter rod, so as to achieve the effect of reducing the temperature of flue gas.

The invention solves the technical problems by the following technical means:

a composite filter tip with a cooling function is provided with a hollow pipe section, and a plurality of vent holes are formed in one end, close to the hollow pipe section, of the filter tip, and far away from cigarette tobacco shreds.

Furthermore, the plurality of vent holes are divided into one or more rows which are uniformly arranged along the circumference of the filter rod, and each row of vent holes are arranged on the same horizontal plane.

Further, the shortest distance between the vent hole and the hollow pipe section is 1-2mm in size.

Further, when the vent holes are arranged in two rows, the distance between every two adjacent rows of the vent holes is 0.8-1.5 mm.

Furthermore, the filter rod also comprises a special-shaped filter section, and the special-shaped filter section is provided with one or more pore channels penetrating through two ends of the special-shaped filter section.

The filter tip rod further comprises an acetate fiber filtering section, one end of the hollow pipe section is connected with the acetate fiber filtering section, the other end of the hollow pipe section is connected with the special-shaped filtering section, forming paper wraps the acetate fiber filtering section, the hollow pipe section and the special-shaped filtering section, and the vent holes are formed in the positions, corresponding to the acetate fiber filtering section, on the forming paper.

The filter tip rod further comprises an acetate fiber filtering section, one end of the special-shaped filtering section is connected with the acetate fiber filtering section, the other end of the special-shaped filtering section is connected with the hollow pipe section, the acetate fiber filtering section, the hollow pipe section and the special-shaped filtering section are wrapped with forming paper, and the vent holes are formed in the forming paper at positions corresponding to the special-shaped filtering section.

Furthermore, the length size ratio of the acetate fiber filtering section to the special-shaped filtering section to the hollow pipe section is 1 (1-1.5) to 1-2.

Further, the length of the acetate fiber filtering section is 7mm, the length of the special-shaped filtering section is 10mm, and the length of the hollow pipe section is 13mm, or the length of the acetate fiber filtering section, the special-shaped filtering section and the hollow pipe section is 10mm, or the length of the acetate fiber filtering section is 7mm, the length of the special-shaped filtering section is 13mm, and the length of the hollow pipe section is 10 mm.

Further, the circumference size of the filter rod is 16-25 mm. In particular 16.8mm, 18.8mm, 21.8mm, 22.3mm or 24.0 mm.

Furthermore, the surface of the special-shaped filter section is provided with one or more pore channels.

Furthermore, the cross section of the pore channel is of a triangular structure, and the cross section of the special-shaped filtering section is of a gear-shaped structure.

Further, the depth dimension of the pore canal is 1.6mm-2.4 mm.

Furthermore, the special-shaped filter section can also be of a structure with only one pore passage arranged at the center.

Further, the total cross-sectional area of the air-permeable passage is 7.2mm²-16.8mm²。

Furthermore, the invention also discloses application of the composite filter tip rod in cigarettes or non-combustible cigarettes.

In addition, in order to further improve the cooling effect of the composite filter tip rod, the hollow pipe section is designed, the hollow pipe section is a paper pipe with a microporous structure, and the paper pipe is prepared by taking waste paper pulp, heat-conducting particles and phase-change heat-absorbing microcapsules as raw materials and drying and forming the raw materials.

The hollow pipe section takes waste paper pulp as a raw material, the waste paper can be derived from discarded wrapping paper and leftover materials of cigarette paper in the cigarette manufacturing process, waste is utilized, energy is saved, environment is protected, and the cost can be reduced to a certain extent; the heat-conducting particles and the phase-change heat-absorbing microcapsules are added, so that on one hand, the heat-conducting particles can be used as a reinforcing filler of the paper tube, the strength of the paper tube is increased, and the paper tube is not easy to deform in the process of storage or use; on the other hand, the heat conducting particles can increase the heat conducting performance of the hollow pipe section, so that more heat can be led out when smoke passes through the hollow pipe section, the phase-change heat-absorbing microcapsules are combined to absorb the heat in the smoke, the temperature of the smoke can be reduced more, and finally the temperature reduction effect brought by the structure of the invention is combined, so that the temperature of the smoke entering the oral cavity of a smoker is more suitable, and the mouth feel is better.

In addition, the hollow pipe section of the invention takes the phase change heat absorption microcapsule as a raw material and forms an integrated structure with a paperboard, on one hand, the fume can not be in direct contact with the phase change material when passing through the hollow pipe section, the use is more healthy, and the heat conduction particles are added for combined use, so the heat absorption rate is still higher; on the other hand, the paper tube also plays a role in supporting and fixing the phase-change heat-absorbing microcapsule, and the paper tube cannot collapse in the using process.

Further, the heat conducting particles are nano-flaky iron-doped porous carbon.

The nano flaky structure enables the heat conduction particles to have larger heat conduction area and has better enhancement effect on the paper tube, and the iron-doped porous carbon is adopted, so that on one hand, the porous carbon has good heat conduction performance, and the porous structure of the porous carbon is matched with that of the paper tube, and harmful substances in the flue gas can be adsorbed to a certain degree; on the other hand, iron is doped in the porous carbon, so that the porous carbon has certain magnetism, and the heat conducting particles are parallel to the axial center line of the paper tube as much as possible in the preparation process of the paper tube.

Further, the phase change heat absorption microcapsule is prepared by a complex coacervation method by taking paraffin hydrocarbon mixture as a capsule core and sodium alginate and gelatin mixture as a capsule shell, wherein the mass ratio of the sodium alginate to the gelatin is 1: 3.

The phase-change heat-absorbing microcapsule prepared by using the mixture of the sodium alginate and the gelatin as the capsule shell has smooth surface and better toughness, can better protect an inner capsule core, and can prevent the capsule core from being broken in the process of storage or use.

Further, the preparation method of the hollow pipe section comprises the following steps:

s1: taking 150-200 parts by weight of waste paper pulp, adding 3-5 parts by weight of sodium bicarbonate, and stirring until the sodium bicarbonate is completely dissolved to obtain raw paper pulp;

s2: taking 10-15 parts by weight of heat conducting particles, stirring and dispersing in deionized water, adding a silane coupling agent, heating to 50-60 ℃, carrying out heat preservation and reflux treatment for 2-3h, taking out, washing to be neutral by using deionized water, and drying to obtain modified heat conducting particles;

s3: uniformly stirring and mixing the modified heat-conducting particles and 10-12 parts by weight of phase-change heat-absorbing microcapsules, adding the mixture into original paper pulp, stirring and dispersing the mixture, adding 5-10 parts by weight of nano cellulose, continuously stirring and dispersing the mixture for 1 hour, placing the mixture into a magnetic field with the magnetic induction intensity of 1-3T, and continuously stirring the mixture for 30 minutes to obtain mixed paper pulp;

s4: and (3) immediately, uniformly and slowly pouring the mixed paper pulp into a paper tube mold, and drying and molding at the temperature of 90 ℃ to obtain the hollow tube section.

The magnetic field direction of the magnetic field is parallel to the axial direction of the container for containing the mixed paper pulp, and the heat conducting particles are influenced by the magnetic field and can stand up under the action of the magnetic field, so that the heat conducting particles are parallel to the axial central line of the paper tube after being poured into the paper tube mould, and the contact area between the heat conducting particles and the smoke can be increased to a certain extent in the using process; meanwhile, sodium bicarbonate is added in the paper tube preparation process, and is heated and decomposed to generate gas in the drying process, so that a large number of micropores are formed on the surface of the paper tube, and the finally obtained paper tube has a porous structure; in addition, the nano-cellulose is added in the preparation process of the paper tube, the surface of the nano-cellulose has more free hydroxyl groups, and the nano-cellulose can be tightly combined with fibers, heat conducting particles and phase change heat absorption microcapsules in paper pulp in the paper tube forming process to form hydrogen bonds, so that the paper tube hardness can be increased.

Further, the preparation method of the heat conducting particles comprises the following steps: adding ferrous sulfate heptahydrate into an ammonium humate solution, heating to 50 ℃, continuously stirring for 1h, adding phenanthroline, uniformly stirring and mixing, placing in a reaction kettle, reacting for 6h at 180 ℃, after the reaction is finished, violently stirring and evaporating to dryness at 90 ℃, fully grinding the obtained solid, placing in a tubular furnace, preserving heat at 200 ℃ for 30min under the atmosphere of nitrogen, then heating to 700 ℃ for 1h, finally heating to 900 ℃ for 4h, cooling to room temperature after the treatment is finished, taking out, refluxing for 2h by using 2mol/L sodium hydroxide solution, washing to neutrality by using deionized water, and drying at 100 ℃ to obtain the heat-conducting particles.

The invention has the beneficial effects that:

1. according to the composite filter tip rod with the cooling function, the venturi effect is utilized, the hollow pipe section and the air suction holes are arranged, during suction, smoke firstly passes through the hollow pipe section and then flows through other filtering parts, the overflowing end face of the smoke of other filtering parts is inevitably smaller than that of the hollow pipe section, the flowing speed of the smoke is increased due to the fact that the overflowing end face of the smoke is reduced, the pressure of fluid is further reduced, negative pressure is generated near the smoke flowing at a high speed, the air suction holes are just arranged in an area generating the negative pressure, better pressure difference can be generated, outside air is sucked into the filter tip rod, and the effect of reducing the temperature of the smoke is achieved.

2. The composite filter tip rod with the cooling function provided by the invention has better heat absorption and heat conduction performance by designing the hollow pipe section, and smoke cannot be in direct contact with a phase-change material in the using process, so that the composite filter tip rod is healthier.

3. According to the hollow pipe section, the heat conduction particles and the phase change heat absorption microcapsules are gathered on the hollow pipe section body, so that the hollow pipe section is not collapsed in the using process, and the heat conduction particles can also play a role in strengthening the hollow pipe section.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of a composite filter rod with a cooling function according to the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of a composite filter rod with a cooling function according to the present invention;

FIG. 3 is a schematic structural view of a third embodiment of a composite filter rod with a cooling function according to the present invention

FIG. 4 is a schematic representation of a cross-section of a shaped filter segment of the present invention (gear-like);

FIG. 5 is a schematic representation of a cross-section of a shaped filter segment of the present invention (C-shaped);

wherein, the hollow pipe section 1, the special-shaped filtering section 2, the acetate fiber filtering section 3, the vent hole 4 and the pore canal 5.

Detailed Description

The present invention will be described in detail with reference to specific examples below:

the invention relates to a composite filter tip rod with a cooling function, which comprises a hollow pipe section 1 and a special-shaped filterThe section 2 and the acetate fiber filtering section 3, the length size ratio of the acetate fiber filtering section 3, the special-shaped filtering section 2 and the hollow pipe section 1 is 1 (1-1.5): 1-2, a plurality of vent holes 4 are arranged on the end, close to the hollow pipe section 1 and far away from the cigarette tobacco shreds, of the filter rod, the number of the vent holes 4 is two or more, and the total area of the vent holes 4 is 0.55-0.6mm²The size of the air suction holes is selected according to the number of the air suction holes, the shapes of the vent holes 4 can be selected to be circular, oval, triangular and the like according to actual conditions, all the vent holes are divided into one row or more than one row according to the actual number, the vent holes are parallel to each other and are uniformly arranged along the circumference of the filter rod, each row of the vent holes are arranged on the same horizontal plane, preferably, the number of the vent holes is two rows, the two rows of the air suction holes can be arranged in order or in a staggered mode, the shortest distance between the vent holes 4 and the hollow pipe section 1 is 1-2mm, the distance between the two rows of the air suction holes is 0.8-1.5mm, and the special-shaped filtering section 2 is provided with one or more pore channels 5 penetrating through two ends of the special-shaped filtering section 2. In addition, in order to further improve the cooling effect of the composite filter tip rod, the hollow pipe section 1 is designed, the hollow pipe section 1 is a paper pipe with a microporous structure, and the paper pipe is prepared by taking waste paper pulp, heat conducting particles and phase change heat absorption microcapsules as raw materials and drying and forming the raw materials. The phase-change heat-absorbing microcapsule is prepared by a complex coacervation method by taking paraffin hydrocarbon mixture as a capsule core and sodium alginate and gelatin mixture as a capsule shell, which are common in the prior art and are not described herein again, wherein the mass ratio of the sodium alginate to the gelatin is 1: 3. The method comprises the following specific steps:

example one

As shown in fig. 1 and 4, in the composite filter rod of the present embodiment, one end of a hollow pipe section 1 is connected with an acetate fiber filtering section 3, the other end is connected with a special-shaped filtering section 2, the acetate fiber filtering section 3, the hollow pipe section 1 and the special-shaped filtering section 2 are wrapped with a piece of wrapping paper, the vent holes 4 are opened at the positions on the wrapping paper corresponding to the acetate fiber filtering section 3, the total number of the vent holes of the present embodiment is 60, the vent holes are divided into two rows and arranged in order, the length of the acetate fiber filtering section 3 is 7mm, the length of the special-shaped filtering section 2 is 13mm, the length of the hollow pipe section 1 is 10mm,the surface of the special-shaped filtering section 2 is provided with a plurality of pore channels 5, the cross sections of the pore channels 5 are of triangular structures, so that the cross section of the special-shaped filtering section 2 is of a gear-shaped structure, the depth dimension of the pore channels 5 is 2.4mm, and the total cross section area of the pore channels 5 is 16.8mm²。

Example two

As shown in fig. 2 and 4, in the composite filter rod of this embodiment, one end of the special-shaped filter section 2 is connected with the acetate fiber filter section 3, and the other end is connected with the hollow pipe section 1, the acetate fiber filter section 3, the hollow pipe section 1, and the special-shaped filter section 2 are wrapped with the forming paper, the vent holes 4 are opened at the corresponding positions of the special-shaped filter section 2 on the forming paper, the total number of the vent holes of this embodiment is 40, the two vent holes are divided into two rows and arranged in a staggered manner, the length of the acetate fiber filter section 3 is 7mm, the length of the special-shaped filter section 2 is 10mm, the length of the hollow pipe section 1 is 13mm, the surface of the special-shaped filter section 2 is provided with a plurality of channels 5, the cross sections of the channels 5 are in a triangular structure, the cross section of the filter section 2 is in a gear-shaped structure, the depth of the channels 5 is 1.8mm, and the total cross-sectional area of the channels 5 is 10mm²。

EXAMPLE III

As shown in fig. 3 and 5, the composite filter rod of the present embodiment is different from the first embodiment in that only one pore channel 5 is formed in the center of the special-shaped filter segment 2, the cross section of the pore channel 5 may be in various shapes, such as C-shaped, heart-shaped, star-shaped, triangular, circular, etc., the cross section of the pore channel 5 is selected to be C-shaped in the present embodiment, and the total cross-sectional area of the pore channel 5 is 7.2mm²。

Example four

The composite filter rod of the present embodiment is different from the first embodiment in that the hollow pipe segment 1 of the present embodiment is prepared by the following method.

Preparation of thermally conductive particles

Adding ferrous sulfate heptahydrate into an ammonium humate solution, wherein the mass ratio of the ferrous sulfate heptahydrate to the ammonium humate is 1.5:1, heating to 50 ℃, continuously stirring for 1h, adding phenanthroline 3 times the mass of the ferrous sulfate heptahydrate, uniformly stirring and mixing, placing into a reaction kettle, reacting at 180 ℃ for 6h, after the reaction is finished, violently stirring at 90 ℃ and evaporating to dryness, fully grinding the obtained solid, placing into a tubular furnace, carrying out heat preservation treatment at 200 ℃ for 30min under the atmosphere of nitrogen, heating to 700 ℃, carrying out heat preservation for 1h, finally heating to 900 ℃, carrying out heat preservation for 4h, cooling to room temperature after the treatment is finished, taking out, refluxing for 2h by using 2mol/L sodium hydroxide solution, washing to be neutral by using deionized water, and drying at 100 ℃ to obtain the heat-conducting particles.

Preparation of hollow pipe sections

S1: taking 150-200 parts by weight of waste paper pulp, adding 3-5 parts by weight of sodium bicarbonate, and stirring until the sodium bicarbonate is completely dissolved to obtain raw paper pulp;

s2: taking 10-15 parts by weight of heat conducting particles, stirring and dispersing in deionized water, adding a silane coupling agent, heating to 50-60 ℃, carrying out heat preservation and reflux treatment for 2-3h, taking out, washing to be neutral by using deionized water, and drying to obtain modified heat conducting particles;

s3: uniformly stirring and mixing the modified heat-conducting particles and 10-12 parts by weight of phase-change heat-absorbing microcapsules, adding the mixture into original paper pulp, stirring and dispersing the mixture, adding 5-10 parts by weight of nano cellulose, continuously stirring and dispersing the mixture for 1 hour, placing the mixture into a magnetic field with the magnetic induction intensity of 1-3T, and continuously stirring the mixture for 30 minutes to obtain mixed paper pulp;

s4: and (3) immediately, uniformly and slowly pouring the mixed paper pulp into a paper tube mold, and drying and molding at the temperature of 90 ℃ to obtain the hollow tube section.

Comparative example 1

The difference between the comparative example and the first example is that the composite filter rod of the comparative example is not provided with vent holes.

Comparative example No. two

The difference between this comparative example and the first example is that the hollow pipe segment 1 of the first example is replaced with a conventional cellulose acetate tip rod.

The circumference of the composite filter rod prepared in the first to fourth embodiments and the first to second comparative examples may be 16 to 25mm, specifically 16.8mm, 18.8mm, 21.85mm, 22.3mm or 24.0mm, for convenience of uniform testing, the circumference of the composite filter rod prepared in the first to fourth embodiments and the first to second comparative examples is 24.00mm, and the composite filter rod prepared in the first to fourth embodiments and the first to second comparative examples is used for testing the smoke cooling effect, and the existing conventional acetate fiber filter rod is used as a blank for comparison, and the testing method is as follows: respectively rolling the same mass of tobacco shreds into cigarettes, then respectively rolling the cigarettes with the composite filter rods together to prepare cigarette samples, adjusting the cigarette samples in a constant-temperature constant-humidity box with the temperature of 22 +/-1 ℃ and the relative humidity of 60 +/-3% for 48 hours under the atmosphere adjusting condition specified in GB/T16447, then putting the cigarette samples on a linear smoking machine for smoking, wherein the smoking capacity is 35mL, the smoking time per mouth is 2s, one mouth is smoked per minute until the cigarette samples are burnt out, simultaneously placing a thermocouple at a position 1-2mm away from the end part of the composite filter rod for measuring the temperature before smoking, placing the thermocouple close to the center of the composite filter rod, and starting smoking after placing.

The results are shown in table 1:

TABLE 1

As can be seen from the above table, the composite filter rod prepared by the invention has an obvious cooling effect on smoke, so that the inlet temperature is more suitable, and the data comparison of the first embodiment to the third embodiment shows that the composite filter rod prepared by the second embodiment has the best cooling effect, and the data comparison of the first embodiment and the comparative embodiment proves that the matching relationship between the vent holes and the hollow paper tubes in the invention is a necessary means for obtaining the cooling effect, and the two are not the same, and the data comparison of the first embodiment and the fourth embodiment shows that the temperature of mainstream smoke can be further reduced and the cooling effect is better after the hollow tube sections are replaced by the paper tubes prepared by the invention.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.