Cooling composite filter rod and heated cigarette

Abstract

This application discloses a cooling composite filter rod and a heated cigarette. The cooling composite filter rod includes a first forming paper and a filter element wrapped inside the first forming paper. The filter element includes a support section, a filter section, and a hollow section arranged sequentially. The filter element also includes isolation paper. Isolation paper is respectively arranged between the support section and the filter section, and between the filter section and the hollow section. Both ends of the filter section pass through the corresponding isolation paper and are connected to it to allow smoke to pass through. A gap is formed between the filter section and the first forming paper. Multiple first vent holes are formed on the first forming paper at positions corresponding to the filter section. Second vent holes are formed on the isolation paper between the filter section and the hollow section so that airflow passes through the first vent holes and the second vent holes and enters the hollow section, mixing with the smoke flowing out of the filter section. This cooling composite filter rod can significantly reduce the smoke temperature at the inlet end and the surface temperature of the composite filter rod.

Description

Technical Field

[0001] This application relates to the field of filter rod technology, and in particular to a cooling composite filter rod and a heated cigarette. Background Technology

[0002] Currently, heated cigarettes on the market primarily use the electric heating function of specialized smoking devices to continuously heat the smoke-generating section of the cigarette, typically at a temperature of 250-350℃. However, heated cigarettes are relatively short, and the continuous high-temperature heating of the smoke-generating section during smoking results in insufficient cooling of the smoke at the inlet, leading to an excessively high temperature and a burning sensation in the mouth. The temperature of the smoke is crucial to the smoking experience, and reducing the smoke temperature is a key technological direction for the continuous improvement of heated cigarette products. Summary of the Invention

[0003] This invention provides a cooling composite filter rod and a heated cigarette to solve the technical problem of excessively high temperature of the smoke at the inlet end of the heated cigarette in the prior art.

[0004] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0005] In a first aspect, the present invention provides a cooling composite filter rod, comprising a first forming paper and a filter element wrapped within the first forming paper. The filter element comprises a support section, a filter section, and a hollow section arranged sequentially. The filter element further comprises a separating paper. The separating paper is disposed between the support section and the filter section, and between the filter section and the hollow section. Both ends of the filter section pass through and are connected to the corresponding separating paper to allow flue gas to pass through. A gap is formed between the filter section and the first forming paper. A plurality of first vent holes are formed on the first forming paper at positions corresponding to the filter section. A second vent hole is formed on the separating paper between the filter section and the hollow section to allow airflow to pass through the first vent hole and the second vent hole and enter the hollow section to mix with the flue gas flowing out of the filter section.

[0006] Furthermore, the filter section includes a filter material and a second forming paper covering the filter material, the second forming paper being connected to the release paper.

[0007] Furthermore, the second forming paper is snapped or bonded to the release paper.

[0008] Furthermore, the diameter of the filter section is 2mm to 4mm.

[0009] Furthermore, the filter material includes cellulose acetate.

[0010] Furthermore, the number of the second vent holes is 2 to 4, and the second vent holes are evenly distributed on the isolation paper.

[0011] Furthermore, the distance between the second vent and the center of the isolation paper is greater than half the radius of the isolation paper.

[0012] Furthermore, the relationship between the number N1 and diameter R1 of the first vent holes and the number N2 and diameter R2 of the second vent holes satisfies: (N2*R2) 2 ) / (N1*R1 2 )>1.5.

[0013] Furthermore, the length of the hollow section is 5mm to 10mm.

[0014] Furthermore, the support section includes a hollow branch pipe, the wall material of which is cellulose acetate, and the wall thickness is 1.5mm to 2.0mm.

[0015] In a second aspect, the present invention provides a heated cigarette, comprising a smoke-generating section, a tipping paper, and the aforementioned cooling composite filter rod, wherein the smoke-generating section and the cooling composite filter rod are connected by the tipping paper, and a third vent hole corresponding to the first vent hole is formed on the tipping paper.

[0016] The cooling composite filter rod provided by this invention is provided with a support section, a filter section, and a hollow section in sequence, and a separating paper is provided between the three sections. The filter section passes through the separating paper and is connected to the support section and the hollow section through the separating paper. A gap is provided between the filter section and the first forming paper, and a first vent hole is provided on the first forming paper at the corresponding position of the filter section. A second vent hole is provided on the separating paper between the filter section and the hollow section. Thus, during the suction process, cold air enters the hollow section through the first vent hole, the gap between the filter section and the first forming paper, and the second vent hole, and mixes with the flue gas after passing through the filter section, thereby reducing the temperature of the flue gas.

[0017] The cooling composite filter rod of the present invention, through the setting of the filter section and the design of the flow of flue gas and cold air, makes the airflow velocity of cold air greater than that of flue gas. Due to the velocity difference, the pressure field at the outlet of the filter rod changes, and a negative pressure zone is formed in the center of the flue gas outlet in the hollow section. The flue gas in the center will flow to the surrounding cold air, and at the same time, the air outside the filter rod will also flow to the flue gas outlet. Therefore, the above-mentioned cooling composite filter rod can not only achieve sufficient heat and mass exchange between hot flue gas and cold air, but also further draw the cold air at the outlet of the filter rod into the negative pressure zone, thereby achieving the effect of cooling the flue gas and avoiding the problem of burning the mouth when sucking. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the cooling composite filter rod in an embodiment of the present invention;

[0020] Figure 2 This is a side view of the cooling composite filter rod in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of heated cigarettes in an embodiment of the present invention.

[0022] Figure label:

[0023] 1. First forming paper; 11. First vent; 2. Support section; 3. Filter section; 31. Filter material; 32. Second forming paper; 4. Hollow section; 5. Separating paper; 51. Second vent; 6. Smoke generating section. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0028] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0029] like Figure 1 , Figure 2 As shown, in a first aspect of this application, a cooling composite filter rod is provided, comprising a first forming paper 1 and a filter element wrapped within the first forming paper 1. The filter element includes a support section 2, a filter section 3, and a hollow section 4 arranged sequentially. The filter element also includes a separating paper 5. Separating papers 5 are respectively arranged between the support section 2 and the filter section 3, and between the filter section 3 and the hollow section 4. Both ends of the filter section 3 pass through the corresponding separating papers 5 and are connected to them to allow flue gas to pass through. A gap is formed between the filter section 3 and the first forming paper 1. A plurality of first vent holes 11 are formed on the first forming paper 1 at positions corresponding to the filter section 3. A second vent hole 51 is formed on the separating paper 5 between the filter section 3 and the hollow section 4 so that airflow passes through the first vent hole 11 and the second vent hole 51 and enters the hollow section 4 to mix with the flue gas flowing out of the filter section 3.

[0030] Reference Figure 1 The filter element comprises a support section 2, a filter section 3, and a hollow section 4 arranged sequentially. Smoke flows sequentially through the support section 2, filter section 3, and hollow section 4 to the outlet of the filter rod. The function of the support section 2 is twofold: firstly, to provide a flow channel for the smoke; and secondly, to prevent displacement of the smoke-generating section 6 when the heated cigarette is inserted into the smoking device. Specifically, the support section includes a hollow branch tube, the wall of which is made of cellulose acetate with a wall thickness of 1.5mm to 2.0mm.

[0031] A separating paper 5 is placed between the filter section 3 and the support section 2, with one end of the filter section 3 passing through the separating paper 5. After the flue gas passes through the support section 2, the separating paper 5 obstructs the flow of the flue gas, causing it to flow along the filter material 31 in the filter section 3. A gap is formed between the filter section 3 and the first forming paper 1, and a first vent hole 11 is provided on the first forming paper 1, allowing cold air to flow into the filter rod through the first vent hole 11 and the aforementioned gap. By adjusting the diameter and number of the first vent holes 11, the flow rate and volume of the cold air can be controlled.

[0032] A separating paper 5 is provided between the filter section 3 and the hollow section 4, and a second vent 51 is formed on the separating paper 5. One end of the filter section 3 passes through the separating paper 5, allowing the flue gas to enter the hollow section 4. The cold air that flows in through the first vent 11 and the gap also enters the hollow section 4 through the second vent 51.

[0033] In this embodiment, the flue gas enters the hollow section 4 through the filter section 3, and the cold air enters the hollow section 4 through the gap and the vent. The speed of the cold air is greater than that of the flue gas. Due to the speed difference, the pressure field at the outlet of the filter rod changes, and a negative pressure zone is formed in the center of the flue gas outlet of the hollow section 4. The flue gas in the center will flow to the surrounding cold air, and at the same time, the air outside the filter rod will also flow to the flue gas outlet. Therefore, the above-mentioned cooling composite filter rod can not only achieve sufficient heat and mass exchange between hot flue gas and cold air, but also further draw the cold air at the outlet of the filter rod into the negative pressure zone, thereby achieving the effect of cooling the flue gas and avoiding the problem of burning the mouth when sucking.

[0034] In some embodiments, the filter section 3 includes a filter material 31 and a second forming paper 32 covering the filter material 31, the second forming paper 32 being connected to the release paper 5. In this embodiment, the filter material 31 is a conventional cigarette filter rod material or a paper filter core material. The filter rod material of conventional cigarettes can be selected from cellulose acetate, non-woven fabric, and short fibers. The first forming paper 1 and the second forming paper 32 are both commonly used cigarette tipping papers. Specifically, the diameter of the filter section 3 is 2mm to 4mm. By adjusting the diameter of the filter section 3 and the density of the filter material 31, the flow rate and volume of the smoke can be controlled. The filter material 31 is selected from one or more of cellulose acetate, non-woven fabric, and short fibers.

[0035] Furthermore, the second forming paper 32 is snapped or bonded to the release paper 5. The release paper 5 serves to fix the filter section 3, and the filter section 3 is fixed by the connection between the second forming paper 32 and the release paper 5.

[0036] In some embodiments, reference is made to Figure 2The number of second vents 51 is 2 to 4, and the second vents 51 are evenly distributed on the isolation paper 5. In this embodiment of the application, the even distribution of the second vents 51 on the isolation paper 5 enables cold air to enter the hollow section 4 evenly from all sides. Setting the number of second vents 51 to 2 to 4 ensures that the airflow has a velocity much higher than that of the flue gas, thereby satisfying the condition for forming a large airflow velocity difference.

[0037] Specifically, the length of the hollow section 4 is 5mm to 10mm. The length of the hollow section 4 needs to be set to leave enough space to form a negative pressure zone; if the hollow section 4 is too short, it will not be able to form a negative pressure zone, and if it is too long, it will not be conducive to drawing in cold air from the outside, and the hollow section 4 will easily collapse during suction because it lacks support.

[0038] In some embodiments, the distance between the second vent 51 and the center of the release paper 5 is greater than half the radius of the release paper 5. (See also...) Figure 2 By setting the second vent 51 slightly away from the center of the isolation paper 5, it is possible to ensure the formation of airflow recirculation in the hollow section 4, so that the hot flue gas in the center flows towards the cold air coming out from the second vent 51, and gives the flue gas radial momentum, thereby causing the external cold air to flow towards the center of the hollow section 4 and mix with the hot flue gas, thus forming an overall recirculation effect.

[0039] In some embodiments, the relationship between the number N1 and diameter R1 of the first vent holes 11 and the number N2 and diameter R2 of the second vent holes 51 satisfies: (N2*R2) 2 ) / (N1*R1 2 >1.5. In this embodiment, it is necessary to ensure that sufficient cold air enters the gap between the filter section 3 and the first forming paper 1 from the first vent 11, and the flow rate and velocity of the cold air are controlled by the second vent 51 and should not be limited by insufficient flow from the first vent 11. In this embodiment, the ratio of the cold air velocity to the flue gas velocity is greater than 4.

[0040] A second aspect of this application provides a heated cigarette, including a smoke-generating section 6, a tipping paper, and the aforementioned cooling composite filter rod. The smoke-generating section 6 and the cooling composite filter rod are connected by the tipping paper, on which a third vent hole corresponding to the first vent hole 11 is formed.

[0041] Reference Figure 3The heated cigarette in this embodiment has a length of 45mm and a diameter of 17.6mm. The smoking section 6 is 12mm long, the support section 2 is 10mm long, the filter section 3 is 16mm long, and the hollow section 4 is 7mm long. When this heated cigarette is installed in a heated smoking device and inhaled, the temperature of the smoke entering the smoker's mouth is found to be 42°C. A conventional heated cigarette, with a smoking section 6 of 12mm length, a support section 2 of 10mm length, a cooling section of 16mm length, and a filter section 3 of 7mm length (the cooling section is hollow, and the filter section 3 is filled with cellulose acetate), when installed in a heated smoking device, has a smoke temperature of 58°C entering the smoker's mouth. It is evident that the smoke temperature at the inlet end of the heated cigarette in this embodiment is significantly reduced.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling composite filter rod, characterized by: The filter rod comprises a first plug wrap and a filter core wrapped in the first plug wrap, the filter core comprises a support section, a filter section and a hollow section arranged in sequence, and the filter core further comprises isolation paper, the isolation paper is arranged between the support section and the filter section and between the filter section and the hollow section, and the filter section is connected to the isolation paper at both ends thereof to pass smoke. A plurality of first air holes are formed on the first plug wrap at positions corresponding to the filter section, and second air holes are formed on the isolation paper between the filter section and the hollow section to allow air flow to enter the hollow section through the first air holes and the second air holes and mix with smoke flowing out of the filter section.

2. The cooling composite filter rod according to claim 1, characterized in that The filter section comprises filter material and a second plug wrap wrapped outside the filter material, and the second plug wrap is connected to the isolation paper.

3. The cooling composite filter rod according to claim 2, wherein The second plug wrap is snap-connected or adhesively connected to the isolation paper.

4. The cooling composite filter rod according to claim 2, wherein The diameter of the filter section is 2mm-4mm.

5. The cooling composite filter rod according to claim 2, wherein The filter material comprises acetate fiber.

6. The cooling composite filter rod according to any one of claims 1 to 5, wherein The number of the second air holes is 2-4, and the second air holes are uniformly arranged on the isolation paper.

7. The cooling composite filter rod according to any one of claims 1 to 5, wherein The distance between the second air holes and the center of the isolation paper is greater than half the radius of the isolation paper.

8. The cooling composite filter rod according to any one of claims 1 to 5, wherein The relationship between the number N1, aperture R1 of the first vent and the number N2, aperture R2 of the second vent satisfies: (N2*R2 2 ) / (N1*R1 2 )>1.

5.

9. The cooling composite filter rod according to any one of claims 1 to 5, wherein The length of the hollow section is 5mm-10mm.

10. The cooling composite filter rod according to any one of claims 1 to 5, wherein The support section comprises a hollow branch pipe, the pipe wall of the branch pipe is made of acetate fiber, and the thickness of the pipe wall is 1.5mm-2.0mm.

11. A heat-not-burn cigarette, characterized by The filter rod comprises a smoking section, a tipping paper and the temperature-reducing composite filter rod according to any one of claims 1-10, the smoking section is connected to the temperature-reducing composite filter rod through the tipping paper, and the tipping paper is provided with third air holes corresponding to the first air holes.

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