Porous element capable of being used for cigarette as well as filter stick and cigarette comprising porous element

Abstract

A porous element capable of being used for cigarettes is a cage type porous bar comprising a wall material, the wall material is provided with a hollow structure formed by fiber materials in a penetrating and interweaving mode, the porous element further comprises a hollow channel consistent with or parallel to the central axis of the wall material, and at least one blocking piece is arranged at the two ends of the hollow channel or between the two ends of the hollow channel. The utility model further discloses a filter stick and a cigarette comprising the porous element. Compared with an existing ternary cavity composite filter stick filled with particles, the porous element which is locally blocked has a rich pore structure, circulating smoke is interfered, more smoke makes contact with the porous element, smoke interception is generated, and the release amount of mainstream smoke is reduced. The porous element is simple in preparation process, the pore structure is easy to regulate and control, and industrialization is facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of cigarettes, relates to a filter rod structure, in particular to a composite filter rod containing a porous element and a cigarette. Background Art

[0002] In order to reduce the tar and harmful components in cigarette smoke and improve the sensory quality of cigarette smoke, using a composite filter rod with a granular ternary cavity as a cigarette mouthpiece is a main technical means. By changing the smoke airflow using the stacking pores of particles with different particle sizes, the smoke interception is increased or the sensory qualities such as the aroma and moisturizing of the cigarette are improved. However, limited by the process requirements of the filter rod, the size, stacking density, shape, filling amount, etc. of the particles need to be controlled within a strict range. For example, the particle size needs to be controlled within a certain particle size range, such as 20 - 40 mesh, which reduces the pore regulation range between particles and cannot provide a more abundant and complex smoke flow path. And there is an unstable filling amount phenomenon during the addition process, and the particle dropping requires multiple processes such as cleaning and recycling for treatment, which reduces the production efficiency. Content of the Utility Model

[0003] In order to make up for the above deficiencies of the prior art, the purpose of the utility model is to provide a porous element that can be used in cigarettes, a filter rod and a cigarette containing the porous element, which can not only meet the design requirements of the mouthpiece for improving the smoke quality, but also has a simple processing technology and high production efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A porous element that can be used in cigarettes is a cage - type porous strip rod including a wall material. The wall material has a hollow structure formed by the interweaving of fiber materials, and also includes a hollow channel that is consistent with or parallel to the central axis of the wall material. At least one blocking member is provided at both ends or between both ends of the hollow channel. The blocking member can be set at both ends of the hollow channel, any position between both ends, and can interfere with the airflow.

[0006] Optionally, a blocking member is provided at one end of the hollow channel; or, blocking members are provided at both ends of the hollow channel; or, a blocking member is only provided at the middle part of the hollow channel; or, blocking members are provided at both ends and the middle part of the hollow channel simultaneously.

[0007] Optionally, spherical particles are embedded in the middle part of the hollow channel to form an intermediate blocking member.

[0008] Optionally, the fiber materials extend in three - dimensional space, and several pore channels are formed between different fibers.

[0009] Optionally, the fiber materials are in a wave - like shape, and at least one fiber material extends in a spiral manner along the axis.

[0010] Optionally, the wall material contains pore channels, including uniform and / or non-uniform channels.

[0011] Optionally, the filter rod material is cylindrical; and / or, its outer diameter is 4-9 mm; and / or, the hollow channel is a single-diameter or variable-diameter channel, and the diameter of the hollow channel is 0.1 mm - 8.5 mm, preferably 0.5 - 4.5 mm.

[0012] Optionally, the outer diameter of the filter rod material can vary periodically, with a diameter of 0.5 - 9 mm, preferably 2 - 8 mm.

[0013] Optionally, the wall material thickness is 0.2 - 4 mm, and the wall pore porosity ratio is 10 - 90%.

[0014] Optionally, the end face plugging member is a mesh structure.

[0015] Optionally, the intermediate plugging member is spherical particles.

[0016] The preparation of the porous element with plugging can be carried out by hot pressing to set at least one plugging at any position of both ends and the middle of the hollow structure to interfere with the air flow; by using a bonding material at both ends to plug the two ends of the hollow structure, and the bonding material includes paper, hot-melt material, and a mesh woven from linear materials; in addition, the intermediate plugging can be formed by adding spherical particles in the middle of the hollow structure.

[0017] A filter rod comprising the porous element for cigarettes described in any one of the above, the filter rod further includes a filtering element, and the porous element and the filtering element are assembled to form a composite filter rod.

[0018] Optionally, the filter rod is a ternary cavity composite filter rod formed by assembling the porous element and a tow filter rod.

[0019] A cigarette comprising the porous element described in any one of the above, further includes an upstream smoke-generating element and a filtering element, and the porous element, the upstream smoke-generating element, and the filtering element are assembled and connected in the direction of the smoke flow to form the cigarette.

[0020] Compared with the existing cavity filter rods filled with particles, the present invention obtains the following beneficial effects:

[0021] 1) The porous element adopted therein has a rich pore structure, distributed between fibers and between fiber yarns. Its overall structure can be similar to a cylindrical bar, with high stiffness, suitable for the operation of common cigarette machines and composite forming processes, with low equipment requirements, simple process, less process management, and high production efficiency;

[0022] 2) The two ends or the middle part of the porous element are blocked, which radially interferes with the flow path of the flue gas, enabling more flue gas to come into contact with the porous element, resulting in flue gas interception and reducing the release amount of the mainstream flue gas;

[0023] 3) The cage-like porous structure of the porous element can be formed in one step by weaving, with a simple preparation process, easy regulation of the pore structure, and being conducive to industrialization;

[0024] 4) The cavity inside the porous element can be added with other functional particles, and the wall material is composed of curved fiber yarns with certain elasticity, which is conducive to the positioning and fixation of large particle size materials in the capsule, providing a new implementation path for improving the quality of cigarettes;

[0025] 5) The capillary pores between the fibers of the porous element itself are conducive to loading functional materials, such as temperature-reducing materials, aroma components, selective harm reduction components, humectants, etc. The adsorption capacity is large and adjustable, which is conducive to functional modification and meets the sensory quality requirements of tobacco use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of an embodiment of the porous element with both ends blocked in the present utility model.

[0027] Figure 2 is Figure 1 a schematic end face cross-sectional view of the porous element shown in

[0028] Figure 3 is a schematic structural diagram of a cigarette including the present utility model.

[0029] Figure 4 is a schematic structural diagram of an embodiment of an intermediate product of the cage-type porous bar of the present utility model before soaking;

[0030] Figure 5 is a schematic structural diagram of an embodiment of the intermediate product of the cage-type porous bar of the present utility model after filling the core material.

[0031] Figure 6 is a 3D schematic diagram of the weaving structure of an embodiment of the cage-type porous bar of the present utility model.

[0032] Figure 7 is a 3D schematic diagram of the radial cross-section of an embodiment of the cage-type porous bar of the present utility model.

[0033] Figure 8 is a schematic axial cross-sectional view of an embodiment of the cage-type porous bar of the present utility model.

[0034] Reference numerals in the drawings:

[0035] 1 - circular belt-shaped intermediate product, 2 - core material.

[0036] 10. Porous element; 11. Cage-type porous strip; 12. End face plugging member; 20. Conventional acetate fiber filter rod; 30. Composite filter rod; 40. Conventional cigarette materials. Detailed implementation mode

[0037] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] Embodiment 1

[0039] As Figure 1 shown, Figure 1 It is a schematic structural diagram of a cigarette with a composite filter rod containing a porous element according to the present utility model.

[0040] The composite filter rod 30 is a ternary structure composed of a porous element 10 and an acetate fiber filter rod 20. The smoking element and the composite filter rod are formed by rolling. The porous element is prepared by a process of weaving, washing, and plugging with acetic acid fiber and polyvinyl alcohol fiber, and the plugging material is hot melt adhesive.

[0041] The porous element 10 has a diameter of about 7 mm, a wall thickness of about 1.5 mm, a wall hole ratio of about 75%, a pore spacing between yarns of about 1 mm, a length of about 10 mm, and a weight of 50 mg.

[0042] The two sections of tow filter rods forming the ternary composite filter rod 30 each have a length of about 10 mm and are made from acetate cellulose tow by filter rod forming.

[0043] Embodiment 2

[0044] The difference from Embodiment 1 is that: a capsule with a diameter of 3.3 mm is filled in the middle of the hollow channel of the porous element to form a plugging in the middle.

[0045] Embodiment 3

[0046] The difference from Embodiment 1 is that: in the preparation process of the porous element, wire shrinkage is utilized to form a venturi-like variable diameter structure in the middle of the porous element.

[0047] Control example

[0048] Take 50 mg of porous silica (1.0 mm in diameter, 400 m 2 / g) to replace the porous element 10, and a cavity filter rod is obtained by compounding with an acetate fiber filter rod. The granular filter rod with the same filling amount occupies about 30% of the cavity in a 10 mm length.

[0049] On a conventional SM450 smoking machine for analysis, the mainstream cigarette smoke is detected in accordance with Chinese GB / T 19609 - 2004, and the smoke data is shown in Table 1.

[0050] As can be seen from the comparison, the filter rod of the present utility model containing a porous element can completely fill the cavity, and the release amount of cigarette smoke is slightly reduced. The filtration efficiency of the composite filter rod for nicotine is increased by about 6 percentage points, and the tar in the smoke is reduced.

[0051] Table 1 Cigarette smoke data of cigarettes containing different filter rod materials

[0052]

[0053] The filter rod of the present utility model using a porous element uses a lightweight hollow porous filter rod material, which can not only provide a rich pore structure, but also provide a hardness (>85%) and a cylindrical rod structure, which can meet the requirements of one-step filter rod forming and cigarette rolling and joining for the filter rod. The hollow porous filter rod provides a considerable smoke interception contact area by fibers, which can reduce the release amount of smoke tar, can meet the design requirements of the filter rod for improving the smoke quality, and the filter rod is simple to form and has high production efficiency.

[0054] The cage-type porous rod adopted by the present utility model is further described below.

[0055] Figure 4 The figure shows a schematic structural diagram of an intermediate product of an embodiment of the cage-type porous rod before soaking. The circular belt-shaped intermediate product is a hollow cylindrical structure before soaking, the tube wall is composed of interwoven acetate fibers and polyvinyl alcohol fibers, and the central part is a cavity. At this time, the tube wall is tightly interwoven, only with tiny gaps generated by fiber interweaving, the surface is relatively flat, the texture is soft and easy to deform, lacking stiffness, and the cross-section is easy to disperse after shearing.

[0056] Figure 5 The figure shows a schematic structural diagram of an intermediate product of an embodiment of the cage-type porous rod after filling the core material before soaking. The core material smaller than the cavity diameter causes the polyvinyl alcohol fibers to dissolve, and then the acetate fibers shrink and thicken to form a hollowed-out tube wall, increasing the three-dimensional degree of the smoke channel and the contact area with the smoke. After drying, the hollow cavity of the hollow cage-type circular belt-shaped intermediate product has the same diameter as the core material.

[0057] Figure 6 The figure shows a 3D schematic diagram of the weaving structure of an embodiment of the cage-type porous rod of the present utility model. It can be clearly seen from the figure that the wavy fiber material is arranged in a spiral along the axis; it can be seen from the figure that the polyvinyl alcohol fibers dissolve in water (playing a pore-forming role), and a hollow structure appears between the remaining acetate fibers. The residual polyvinyl alcohol bonds between and on the surface of the acetate fibers after drying (playing a bonding role), maintaining the stability of the hollow cage-type porous rod, providing stiffness, and being convenient for processing and transportation. The hollow tube wall structure and the reduced central cavity increase the contact area between the smoke and the temperature reduction structure, improving the temperature reduction effect, making the draw resistance stable and appropriate, reducing the smoke adsorption, and ensuring the smoke flavor.

[0058] Figure 7 Shown is a 3D schematic diagram of the radial cross-section of an embodiment of a cage-type porous rod. It can be seen from the figure that on the cross-section, the cellulose acetate fibers are intertwined to form a tube wall part with a certain thickness. There are uniformly distributed holes in the tube wall, and there is a cavity in the center of the hollow cylindrical cage-type porous rod. Residual polyvinyl alcohol fibers can be seen attached to the surface and inside of the cellulose acetate fibers, making the cage structure stable and not deformed, and not coming apart after shearing.

[0059] Figure 8 Shown is a schematic diagram of the axial cross-section of an embodiment of the cage-type porous rod of the present utility model. This structure is obtained by extruding the Figure 6 cage-type porous rod through molds with different diameters to obtain a rod with a periodically varying outer diameter as required by the design.

[0060] The porosity of the wall holes of the cage-type porous rod is measured by the water displacement method to measure the volume v1 of the fiber material of the porous wall material, and the overall volume V0 of the cage wall is measured by the diameters of the inner core rod and the rod. It is calculated using the pore formula (V0 - V1) / V0 * 100%.

[0061] The hardness performance of the filter rod is measured with reference to GB / T 22838.6 - 2009.

[0062] The following is described in conjunction with specific embodiments of the cage-type porous rod.

[0063] Example A1

[0064] (1) Select cellulose acetate fibers (basic fibers) with a fineness of 1100D and polyvinyl alcohol fibers (bonding fibers) with a fineness of 1100D.

[0065] (2) Use a knitting machine with 32 spindles (such as a 90-series round rope single-head single-machine 32-spindle high-speed knitting machine). The number of cellulose acetate fiber spindles is 16, and the number of polyvinyl alcohol fiber spindles is 16. Knit them into a hollow circular belt-shaped intermediate product. The ratio of cellulose acetate fibers to polyvinyl fibers is 50%:50%, and the corresponding spindle ratio is 1:1.

[0066] (3) Fill the hollow part of the circular belt-shaped intermediate product with a core material with a diameter of 4 mm. The initial soaking temperature is 15°C, and it is heated uniformly or intermittently to 80°C over 40 minutes.

[0067] (4) The soaked circular belt-shaped intermediate product is dried. The drying temperature is 60°C, and the drying time is 40 minutes.

[0068] (5) Through the washing process, the water-soluble polyethylene fiber forms pores while also retaining a certain bonding effect. After measurement, the obtained hollow cage-like porous rod has a diameter of 6.8 mm, a wall thickness of 1.4 mm, a wall porosity of 76%, a content ratio of cellulose acetate (fibrous yarn) to polyvinyl alcohol (shaping material) of 70%:30%, and a hardness of 82%, meeting the requirements of the filter rod forming process.

[0069] Example A2

[0070] (1) Select cellulose acetate with a fineness of 1100 D and polyvinyl alcohol fiber with a fineness of 1100 D, and combine and compound the cellulose acetate fiber and the polyvinyl alcohol fiber, with a total fineness of 2200 D; the polyvinyl alcohol fiber is combined, with a total fineness of 2200 D.

[0071] (2) The number of knitting spindles is 32, and the ratio of the number of spindles of the acetate / polyvinyl alcohol composite fiber to the number of spindles of the polyvinyl alcohol fiber after combining is 1:1, and it is knitted into a hollow circular belt-shaped intermediate product, in which the cellulose acetate fiber and the polyvinyl alcohol fiber are 25%:75%.

[0072] (3) The hollow part of the circular belt-shaped intermediate product is filled with a core material with a diameter of 3 mm, the initial soaking temperature is 15 °C, and it is heated to 80 °C at a uniform speed or intermittently at intervals, taking 40 min.

[0073] (4) The soaked circular belt-shaped intermediate product is dried, the drying temperature is 60 °C, and the drying time is 30 min.

[0074] (5) After measurement, the obtained hollow cage-like porous rod has a diameter of 6.8 mm, a wall thickness of 1.9 mm, a wall porosity of 75%, a content ratio of cellulose acetate to polyvinyl alcohol of 65%:35%, and a hardness of 92%.

[0075] Control Example A: Compared with Example 2, the circular belt intermediate product obtained through steps 1 and 2) is not subjected to the washing, pore-forming, and bonding and shaping treatment in step 3). The two ends are loose and cannot maintain a stable circumference. And under the action of extrusion, stretching, etc., it forms a flat structure similar to a shoelace, which is not rod-shaped and the structure in all directions is unstable. Referring to the hardness test method for cigarette filter rods, the hardness is only about 30% and it cannot be directly used for cigarette tipping.

[0076] Example A3

[0077] (1) Select short cellulose acetate fiber yarn with a fineness of 1100 D and short polyvinyl alcohol fiber yarn with a fineness of 1100 D, and combine and compound the short cellulose acetate fiber yarn and the short polyvinyl alcohol fiber yarn, with a total fineness of 2200 D.

[0078] (2) The number of knitting spindles is 32, and the ratio of the number of spindles of the acetic acid / polyvinyl alcohol composite staple fiber yarn to the polyvinyl alcohol staple fiber yarn is 1:1, and it is knitted into a hollow circular belt-shaped intermediate product, in which the ratio of acetic acid fiber to polyvinyl alcohol fiber is 33%:67%.

[0079] (3) The hollow part of the circular belt-shaped intermediate product is filled with a core material with a diameter of 3 mm. Different from Example 1, the initial soaking temperature is 20 °C, the soaking time is 30 min, and then it is transferred to water at 60 °C and ultrasonically treated for 10 min, the ultrasonic frequency is 40 KHz, and the power is 550 W.

[0080] (4) The soaked circular belt-shaped intermediate product is dried, the drying temperature is 60 °C, and the drying time is 30 min.

[0081] The obtained hollow cage-like porous bar has a diameter of 6.8 mm, a wall thickness of 1.9 mm, a wall porosity of 72%, a content ratio of acetic acid fiber to polyvinyl alcohol of 62%:38%, and a hardness of 93%.

[0082] Example A4

[0083] (1) Select acetic acid fiber with a fineness of 2200 D and polyvinyl alcohol fiber with a fineness of 1100 D.

[0084] (2) The number of knitting spindles is 32, and the ratio of the number of spindles of acetic acid fiber to the number of spindles of polyvinyl alcohol fiber is 1:1, and it is knitted into a hollow circular belt-shaped intermediate product, in which the ratio of acetic acid fiber and polyvinyl alcohol fiber is 67%:33%.

[0085] (3) The hollow part of the circular belt-shaped intermediate product is filled with a core material with a diameter of 4 mm. The initial soaking temperature is 20 °C, the soaking time is 30 min, and then it is transferred and immersed in water at 80 °C, fixed and then washed with running water for 20 min, and the washing speed is 2 m / s.

[0086] (4) The soaked circular belt-shaped intermediate product is dried, the drying temperature is 60 °C, and the drying time is 30 min.

[0087] (5) After measurement, the obtained hollow cage-like porous bar has a diameter of 6.8 mm, a wall thickness of 1.4 mm, a wall porosity of 78%, a content ratio of acetic acid fiber to polyvinyl alcohol of 75%:25%, and a hardness of 83%.

[0088] Example A5

[0089] (1) Select acetic acid fiber with a fineness of 450 D and polyvinyl alcohol fiber with a fineness of 450 D.

[0090] (2) The number of knitting spindles is 32, and the ratio of the number of spindles of acetic acid fiber to the number of spindles of polyvinyl alcohol fiber is 1:1, and it is knitted into a hollow circular belt-shaped intermediate product, in which the ratio of acetic acid fiber and polyvinyl fiber is 50%:50%.

[0091] (3) The hollow part of the round belt-shaped intermediate product is filled with a core material with a diameter of 5 mm. The initial soaking temperature is 20 °C, and the soaking time is 10 min. Then it is transferred and immersed in water at 60 °C. After fixation, it is rinsed with running water, and the water flow rate is 1 m / s. At the same time, ultrasonic is turned on, the ultrasonic frequency is 40 KHz, the power is 200 W, and it is soaked for 15 min.

[0092] (4) The soaked round belt-shaped intermediate product is dried. The drying temperature is 60 °C, and the drying time is 30 min.

[0093] (5) After measurement, the obtained hollow cage-like porous bar has a diameter of 6.8 mm, a wall thickness of 0.9 mm, a wall porosity of 80%, a content ratio of cellulose acetate to polyvinyl alcohol of 68%:32%, and a hardness of 79%.

[0094] Example A6

[0095] (1) Select cellulose acetate with a fineness of 2200 D and polyvinyl alcohol fiber with a fineness of 1100 D.

[0096] (2) The number of weaving spindles is 32. The spindle number ratio of cellulose acetate to polyvinyl alcohol is 12:20, and it is woven into a hollow round belt intermediate product, in which the ratio of cellulose acetate and polyvinyl fiber is 55%:45%.

[0097] (3) The hollow part of the round belt-shaped intermediate product is filled with a core material with a diameter of 3 mm. The initial soaking temperature is 15 °C, and it takes 40 min to heat up to 80 °C.

[0098] (4) The soaked round belt-shaped intermediate product is dried. The drying temperature is 60 °C, and the drying time is 30 min.

[0099] (5) After measurement, the hollow cage-like porous bar has a diameter of 6.8 mm, a wall thickness of 1.4 mm, a wall porosity of 84%, a content ratio of cellulose acetate to polyvinyl alcohol of 82%:18%, and a hardness of 58%.

[0100] Example A7

[0101] Referring to Example 2, the difference is that: the number of spindles of the acetic acid / polyvinyl alcohol composite fiber and polyvinyl alcohol fiber is changed to 24:8. The weight ratio of cellulose acetate to polyvinyl fiber in the obtained round belt intermediate product by weaving is 37%:63%. After washing and drying, the cage-like porous bar has a diameter of 6.8 mm, a wall thickness of 1.4 mm, a wall porosity of 75%, a content ratio of cellulose acetate to polyvinyl alcohol of 70%:30%, and a hardness of 75%.

[0102] Example A8

[0103] Referring to Example 2, the difference is that: the number of acetic acid / polyvinyl alcohol composite fiber spindles and the number of polyvinyl alcohol fiber spindles are changed to 30:2. The weight ratio of acetic acid fiber to polyethylene fiber in the circular belt intermediate product obtained by warp knitting is 47%:53%. After washing and drying, the cage-type porous bar has a diameter of 6.8 mm, a wall thickness of 1.4 mm, a wall porosity of 64%, a content ratio of acetic acid fiber to polyvinyl alcohol of 75%:25%, and a hardness of 82%.

[0104] Example A9

[0105] (1) Select acetic acid fiber with a fineness of 1100 D and polyester hot-melt fiber with a fineness of 1100 D. The acetic acid fiber and polyester fiber are combined and compounded, and the total fineness of 2200 D is used as the base fiber; the fineness of the polyvinyl alcohol fiber is 1100 D.

[0106] (2) The number of knitting spindles is 32. The ratio of the number of acetic acid / polyester composite fiber spindles to the number of polyvinyl alcohol fiber spindles is 1:1. A hollow circular belt-shaped intermediate product is knitted, in which the content ratio of acetic acid fiber to polyvinyl alcohol fiber is 50%:50%, and the content ratio of acetic acid fiber to polyester fiber is 50%:50%.

[0107] (3) The hollow part of the circular belt-shaped intermediate product is filled with a core material with a diameter of 3 mm, and it is heated in an oven at a heating temperature of 140 °C for a heating time of 20 min. Subsequently, it is washed in a water bath. The initial soaking temperature is 15 °C, and it is heated uniformly or intermittently to 80 °C over 40 min. It is soaked at 80 °C for heat preservation, and under fixed conditions, it is washed with running water at a washing speed of 1 m / s for a washing time of 60 min to ensure that all the polyvinyl alcohol is dissolved and detached from the circular belt-shaped intermediate product.

[0108] (4) The soaked circular belt-shaped intermediate product is dried at a drying temperature of 60 °C for a drying time of 30 min.

[0109] (5) The measured diameter of the hollow cage-type bar is 6.5 mm, the wall thickness is 1.5 mm, the wall porosity is 42%, in which the content ratio of acetic acid fiber to polyester fiber is 50%:50%, the content of polyvinyl alcohol is 0, and the hardness is 73%.

[0110] In this example, polyester fiber is used as one of the components of the base fiber group, and it plays a role in bonding and shaping through melting, and serves as the base skeleton in the cage-type porous bar; the polyvinyl alcohol fiber is completely dissolved and only plays a role in pore formation.

[0111] Example A10

[0112] Referring to Example A9, the difference is that:

[0113] Step 1: Add 122D polyester fiber to 1100D cellulose acetate fiber. In the intermediate product obtained in Step 2, the content ratio of cellulose acetate fiber to polyvinyl alcohol fiber is 50%:50%, and the content ratio of cellulose acetate fiber to polyester fiber is 90%:10%.

[0114] Step 3: After the same heat treatment, wash at an initial immersion temperature of 15°C in a water bath, and uniformly or intermittently heat up to 80°C over 40 minutes.

[0115] The obtained cage-like porous bar has a diameter of 6.8 mm, a wall thickness of 1.9 mm, a wall porosity of 70%, a content ratio of cellulose acetate fiber to polyester fiber of 90%:10%, a content ratio of cellulose acetate fiber to polyvinyl alcohol of 70%:30%, and a hardness of 87%.

[0116] Example A11

[0117] Refer to Example A9, the difference is as follows:

[0118] 1) Select polyester fiber with a fineness of 1100D and ply it with 1100D polyvinyl alcohol fiber, with a total fineness of 2200D; the total fineness of polyvinyl alcohol fiber is 1100D.

[0119] 2) In the circular belt-shaped intermediate product obtained by weaving, the content ratio of polyester fiber to polyvinyl alcohol fiber is 33%:67%.

[0120] 3) Fill the hollow part of the circular belt-shaped intermediate product with a core material with a diameter of 3.5 mm, heat at 140°C for 30 minutes.

[0121] 4) Wash at an initial immersion temperature of 15°C in a water bath, uniformly or intermittently heat up to 80°C over 40 minutes, and soak at 80°C for 30 minutes.

[0122] 5) Dry the soaked circular belt-shaped intermediate product at a drying temperature of 90°C for 30 minutes.

[0123] After measurement, the obtained hollow cage-like bar has a diameter of 6.2 mm, a wall thickness of 1.3 mm, a wall porosity of 56%, a content ratio of polyester fiber to polyvinyl alcohol of 90%:10%, and a hardness of 95%.

[0124] In this example, polyester fiber is used as the base fiber, which plays a role in bonding and shaping through heating; polyvinyl alcohol fiber is used as the pore-forming material by dissolution, and the residual polyvinyl alcohol acts as a bonding material to increase hardness.

[0125] The above related descriptions and the descriptions of the embodiments are for the convenience of those of ordinary skill in the art to understand and apply the present utility model. It is obvious that those who are familiar with the technology in this field can easily make various modifications to these contents, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present utility model is not limited to the above related descriptions and the descriptions of the embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present utility model without departing from the scope of the present utility model should be within the protection scope of the present utility model.

Claims

1. A porous element that can be used in cigarettes, characterized in that: The invention is a cage-type porous bar comprising a wall material, wherein the wall material has a hollow structure formed by interlacing and interweaving fiber materials, and further comprises a hollow channel which is consistent with or parallel to the central axis of the wall material, and at least one blocking member is provided at or between the two ends of the hollow channel.

2. The porous element for cigarettes according to claim 1, characterized in that: The fiber material extends in three-dimensional space, and a plurality of pore channels are formed between different fibers.

3. The porous element for cigarettes according to claim 1, characterized in that: The fiber material is in a wave-like shape, and at least one fiber material extends in a spiral shape along the axis.

4. The porous element for cigarettes according to claim 1, characterized in that: The wall material contains pore channels, including uniform and / or non-uniform channels.

5. The porous element for cigarettes according to claim 1, characterized in that: The porous element is cylindrical; and / or, its outer diameter is 4-9 mm; and / or, the hollow channel is a single diameter or a variable diameter channel, and the diameter of the hollow channel is 0.1 mm-8.5 mm.

6. The porous element for cigarettes according to claim 1, characterized in that: The diameter of the hollow channel is 0.5-4.5 mm.

7. The porous element for cigarettes according to claim 1, characterized in that: The outer diameter of the porous element may vary periodically, and the diameter is 0.5-9 mm.

8. The porous element for cigarettes according to claim 1, characterized in that: The porous element has a diameter of 2-8 mm.

9. The porous element for cigarettes according to claim 1, characterized in that: The wall material has a thickness of 0.2-4 mm and a wall porosity ratio of 10-90%.

10. The porous element for cigarettes according to claim 1, characterized in that: The blocking pieces arranged at both ends of the hollow channel are mesh structures.

11. The porous element for cigarettes according to claim 1, characterized in that: The blocking pieces arranged between the two ends are spherical particles.

12. A filter rod comprising the porous element for cigarettes according to any one of claims 1 to 11, characterized in that: The filter rod further comprises a filter element, and the porous element and the filter element are assembled to form a composite filter rod.

13. The filter rod according to claim 12, characterized in that: The filter rod is a three-component cavity composite filter rod formed by assembling the porous element and the tow filter rod.

14. A cigarette comprising a porous element according to any one of claims 1 to 11, characterized in that: It also includes an upstream smoking element and a filter element. The porous element, the upstream smoking element and the filter element are assembled and connected with each other according to the direction of smoke flow to form the cigarette.

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