A filter rod for flue gas filtration

Abstract

A filter rod for flue gas filtration is disclosed, the filter rod being made of bulky yarn; the bulky yarn comprises a central, high-shrinkage core yarn and a surrounding, low-shrinkage outer yarn, the outer yarn forming multiple sequentially connected loops along the core yarn. The core yarn is made from any one or a mixture of polylactic acid, polypropylene carbonate, polylactic-co-hydroxyacetic acid copolymer, polybutylene adipate / terephthalate, polycaprolactone, poly-β-hydroxybutyrate, polyhydroxyalkanoate, and polybutylene succinate. The outer yarn is made from any one or a mixture of cellulose fiber, cellulose monoacetate fiber, cellulose diacetate fiber, cellulose triacetate fiber, alginate fiber, chitosan fiber, milk silk fiber, soybean fiber, and silk fiber. This design not only replaces diacetate fiber in the application of tobacco filter rods but also frees up production capacity.

Description

Technical Field

[0001] This invention relates to a filter rod, belonging to the field of tobacco products, and particularly to a filter rod for filtering smoke. Background Technology

[0002] In existing tobacco products, whether cigarettes or heated tobacco products, a filter is installed at the inlet. The filter rod inside the filter rod reduces the temperature of the smoke and adsorbs harmful substances. Most existing filter rods are made of cellulose acetate.

[0003] Fiber acetate is a fiber produced by reacting wood and cotton linters with chemical raw materials such as acetic acid to obtain acetate flakes, which are then spun into fibers. The tow used in filter rods is mainly cellulose diacetate. Fiber acetate filters are widely accepted mechanical filters by consumers of both low-tar and high-tar cigarettes. They are non-toxic, odorless, impact-resistant, oil-resistant, and static-free, with low draw resistance, strong adsorption, and excellent elasticity and thermal stability.

[0004] However, the equipment and materials for cellulose acetate mainly rely on imports, which are very expensive. In particular, the equipment manufacturing technology has long been monopolized by foreign countries, resulting in high expansion costs and insufficient existing production capacity. Even though most cellulose acetate flakes are currently used to produce cigarette filter rods, it cannot meet market demand and also limits the development of cellulose acetate flakes in other textile application fields.

[0005] The root cause of the current situation is the lack of a new design to replace the application of cellulose diacetate in cigarette filters. As a result, cellulose diacetate is mostly limited to cigarette filters. Therefore, there is an urgent need for a new design to replace the role of cellulose diacetate in cigarette filters, so as to break the bottleneck of foreign equipment technology in China.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this patent application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects and problems of existing technologies that cannot replace cellulose diacetate in the application of tobacco filter rods, and to provide a filter rod for flue gas filtration that can replace cellulose diacetate in the application of tobacco filter rods.

[0008] To achieve the above objectives, the technical solution of the present invention is: a filter rod for filtering flue gas, wherein the direction of the filter rod from head to tail is consistent with the direction of the flue gas; the filter rod is made of bulky yarn;

[0009] The bulky yarn includes a high-shrinkage core yarn and a low-shrinkage outer yarn. There is at least one core yarn and one outer yarn. The core yarn is located in the middle of the bulky yarn. The outer yarn is wrapped around the outside of the core yarn. The outer yarn is arranged as multiple loops connected in sequence along the core yarn. The diameter of a single loop is larger than the diameter of the core yarn, and the same core yarn runs through the interior of each loop.

[0010] The raw materials for making the core yarn are any one or any mixture of polylactic acid, polypropylene carbonate, polylactic acid-hydroxyacetic acid copolymer, polybutylene adipate / terephthalate, polycaprolactone, poly-β-hydroxybutyrate, polyhydroxyalkanoate, and polybutylene succinate.

[0011] The outer yarn is made from any one or any mixture of cellulose fiber, cellulose monoacetate fiber, cellulose diacetate fiber, cellulose triacetate fiber, alginate fiber, chitosan fiber, milk silk fiber, soybean fiber, and silk fiber.

[0012] The coil includes a side strip and a high point and a low point connected to its two ends. The high point and the low point are located above and below the core yarn, respectively. The arrangement of the high point and the low point can be any of the following:

[0013] At least one of the high point and low point of the loop is in contact with the outer edge of the core yarn;

[0014] Both the high point and low point of the loop are set far away from the core yarn. There is a high loop gap between the high point of the loop and the core yarn, and a low loop gap between the low point of the loop and the core yarn.

[0015] The filter rod comprises at least two bulky yarns, with adjacent bulky yarns in contact with each other; in each bulky yarn, there are loop gaps between adjacent loops.

[0016] Inside the filter rod, in two adjacent bulky yarns, at least one loop of the other bulky yarn is inserted into a loop gap on one of the bulky yarns, and the number of loops inserted into a single loop gap is at least one.

[0017] The arrangement of all the bulky yarns in the filter rod can be any of the following:

[0018] All the bulky yarns are stacked side by side, all the bulky yarns are parallel to each other, and the direction of each bulky yarn from beginning to end is consistent with the direction of the flue gas.

[0019] All the bulky yarns are intertwined or woven into a single yarn rod, the direction of which from beginning to end is consistent with the direction of the flue gas.

[0020] When all the bulky yarns are stacked side by side, the filter rod is made and used in the following manner: First, multiple bulky yarns are stacked side by side through the bundling opening to obtain the filter rod. All bulky yarns continue to pass through the bundling opening, and the filter rod is continuously obtained. Then, when the obtained filter rod passes through the planar outer layer, the outer layer is rolled up to wrap the filter rod, thereby obtaining the filter column. The filter column is then cut according to the length requirements to obtain multiple filter nozzles.

[0021] When all the bulky yarns are intertwined or woven into a single yarn rod, the filter rod is manufactured and used in the following manner: First, multiple bulky yarns are simultaneously intertwined or woven through a winding device to obtain a yarn rod, i.e., a filter rod. All bulky yarns continue to pass through the winding device, and the yarn rod is continuously obtained. Then, when the obtained yarn rod passes through the planar outer sheath, the outer sheath is rolled up to wrap the yarn rod, thereby obtaining a filter column. The filter column is then cut according to the length requirements to obtain multiple filter nozzles.

[0022] The inner wall of the outer sheath is connected to one end of the side-entry filament, and the other end of the side-entry filament is in contact with or connected to the filter rod. The contact refers to the other end of the side-entry filament extending to the surface of the filter rod, and the connection refers to the other end of the side-entry filament extending into the interior of the filter rod. The number of side-entry filaments is multiple.

[0023] The side-inserted fiber is made of polylactic acid; the side-inserted fiber contacts or connects to the filter rod in the following manner:

[0024] First, multiple side-entry filaments are connected on the flat outer layer by electrostatic flocking or bonding. The free ends of all side-entry filaments are set higher than the outer layer. Then, the outer layer is rolled up to wrap the filter rod. During the wrapping process, the free ends of the side-entry filaments abut against the side of the filter rod or are inserted into the interior of the filter rod.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In a filter rod for flue gas filtration according to the present invention, the direction of the filter rod from head to tail is consistent with the direction of the flue gas. The filter rod is made of bulky yarn, and each bulky yarn includes a high-shrinkage core yarn and a low-shrinkage outer yarn. There is at least one core yarn and one outer yarn. The core yarn is located in the middle, and the outer yarn is wound around the outside of the core yarn. The outer yarn is arranged in multiple loops connected in sequence along the core yarn. The same core yarn runs through the interior of each loop. The advantages of this design include: First, the unique structure of the bulky yarn has strong bulkiness, which can provide outward tension. This tension is beneficial to the filter rod and the outer sheath during subsequent application. The stability and robustness of the interlocking components ensure basic mechanical strength and reliable support. Secondly, the multiple coils arranged along the axial direction of the bulky yarn enrich the internal space of the filter rod, extending the path of flue gas through the filter rod and improving the adsorption effect on harmful substances in the flue gas. Thirdly, each piece of bulky yarn is made of core yarn and outer yarn, offering strong adjustability. During production, the fineness of the fibers can be adjusted (both by screening raw materials of different fineness and controlling the production process), making the diameter of the bulky yarn much smaller than that of existing cellulose acetate fibers, thereby increasing the overall specific surface area of ​​the filter rod and improving its overall adsorption capacity. Therefore, this design, combining the structural characteristics of bulky yarn, uses it as a base for filter rod production. This not only fulfills the basic functions of the filter rod and is compatible with existing cellulose acetate filter rods, but more importantly, the manufacturing equipment and processes for bulky yarn already exist domestically, avoiding the limitations of foreign technology. This significantly reduces investment costs, as everything from raw materials to equipment to technology can be completed domestically, breaking through current bottlenecks and facilitating increased production capacity. Therefore, this invention can not only replace cellulose diacetate in the application of cigarette filter rods, but also free up production capacity.

[0027] 2. In the filter rod for flue gas filtration of the present invention, the core yarn is preferably made of any one or any mixture of polylactic acid, polypropylene carbonate, polylactic acid-glycolic acid copolymer, polybutylene adipate / terephthalate, polycaprolactone, poly-β-hydroxybutyrate, polyhydroxyalkanoate, and polybutylene succinate. When applied, the aforementioned raw materials, represented by polylactic acid, can not only be used to make bulked yarn for filter rod production, but also leverage the heat absorption and cooling effect of polylactic acid itself, which helps to reduce the temperature of the flue gas and improve the comfort of using the filter rod. Simultaneously, the deformation of polylactic acid after absorbing heat can improve the mechanical strength of the filter rod and filter tip, further enriching the internal space of the filter rod and enhancing the adsorption effect of harmful substances in the flue gas. Furthermore, the aforementioned materials are all biodegradable and can decompose in the natural environment without polluting it. Therefore, the present invention not only has a good adsorption effect and improves vaping comfort, but is also biodegradable and environmentally friendly.

[0028] 3. In the filter rod for flue gas filtration of the present invention, the outer yarn is preferably made of any one or a mixture of cellulose fiber, cellulose monoacetate fiber, cellulose diacetate fiber, cellulose triacetate fiber, alginate fiber, chitosan fiber, milk silk fiber, soybean fiber, and silk fiber. When applied, the aforementioned raw materials, represented by cellulose acetate, can not only be used to make bulked yarn for filter rod production, but also achieve similar effects to existing cellulose acetate filter rods, further enhancing the substitutability of bulked yarn for existing cellulose acetate filter rods. Therefore, the present invention can replace cellulose diacetate in the application of tobacco filter rods.

[0029] 4. In the filter rod for flue gas filtration of this invention, each piece of bulky yarn is made of core yarn and outer yarn, offering strong adjustability. This allows for a significant adjustment of the filter rod's porosity through various methods, such as adjusting the fiber ratio between high-shrinkage and low-shrinkage fibers in the bulky yarn raw materials; adjusting the twist coefficient of the yarn during the bulky yarn manufacturing process; and adjusting the bulkiness during the wet heat setting treatment. Therefore, this design possesses strong adjustment capabilities regarding the filter rod's porosity, resulting in strong adjustment capabilities regarding the filter rod's pressure drop. It avoids both excessively low pressure drop, which would limit the filtration efficiency of nicotine and glycerin, and excessively high pressure drop, which would cause smokers to find inhalation difficult and unacceptable, thus gaining smoker acceptance. Therefore, this invention not only offers strong pressure drop adjustment capabilities but also balances adsorption and inhalation comfort, making it more acceptable to smokers.

[0030] 5. In the filter rod for flue gas filtration of this invention, the arrangement structure of all the bulked yarns in the filter rod is diverse, each with its own emphasis. For example, the bulked yarns are stacked side by side, or the bulked yarns exist in the form of yarn rods. This not only adapts to different needs, such as the coordination between various pressure drops, adsorption effects, and support effects, but also provides a longer flue gas passage path, especially when there are loop gaps or coil interlocking between two adjacent bulked yarns, further improving the adsorption function and enhancing the support effect. Moreover, it can be manufactured and applied using appropriate processes to improve production efficiency. For example, multiple bulked yarns can be stacked side by side through a bundling port to obtain a filter rod, or multiple bulked yarns can be twisted or woven together by a winding device to obtain a filter rod. In the production process, unlike existing cellulose acetate filter rods, it is not necessary to add plasticizers (mostly triacetin), which saves processes, reduces costs, and avoids the adverse effects of triacetin on human alveoli. Therefore, the present invention not only has strong adjustability and good production effect, but also avoids the adverse reactions of existing cellulose acetate filter rods.

[0031] 6. In a filter rod for flue gas filtration according to the present invention, multiple side-entry wires can be connected to the outer sheath to cooperate with the filter rod to make a filter tip. The arrangement structure of the side-entry wires is diverse. The basic principle is that at least one end of the side-entry wire is connected to the inner wall of the outer sheath. As for the other end of the side-entry wire, it is not limited to being connected to the inner wall of the outer sheath. However, the side-entry wire must be in contact with or connected to the filter rod. It is best that they can intersect each other, such as being located inside the filter rod or passing through the filter rod. In this way, it can provide the filter rod with a similar longitudinal support force, which can stabilize the filter tip. The outer layer of the filter rod serves two purposes: firstly, it re-divides the existing smoke flow path within the filter rod, increasing spatial layers and extending the smoke path; secondly, based on this design, it is preferable to further limit the material of the side-inserted wire to PLA (polylactic acid), which can also leverage PLA's heat absorption effect to reduce the temperature of the smoke and improve vaping comfort. Simultaneously, PLA undergoes a morphological change after absorbing heat, which strengthens the connection between the internal structures of the filter rod, or the connection between the filter rod and the side-inserted wire, thereby improving the overall robustness of the filter tip. Therefore, this invention not only has good adsorption and cooling effects, but also strong overall robustness and stability. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 yes Figure 1 A schematic diagram of the structure of medium-bulb yarn.

[0034] Figure 3 yes Figure 1 A schematic diagram of the structure of the filter column obtained by combining it with the outer cladding layer.

[0035] Figure 4 This is a schematic diagram illustrating the operation of stacking all the bulked yarns side by side to form filter rods in this invention.

[0036] Figure 5 This is a schematic diagram illustrating the operation of twisting or weaving all the bulky yarns together to form filter rods in this invention.

[0037] Figure 6 This is a schematic diagram of the combination of the side-inserted wire and the filter rod in this invention.

[0038] Figure 7 This is a schematic diagram of the connection between the side-entry wire and the outer sheath in this invention.

[0039] In the diagram: outer layer 1, filter rod 2, bulky yarn 3, core yarn 31, outer yarn 32, loop 33, loop high point 331, loop side strip 332, loop low point 333, high loop gap 334, low loop gap 335, loop gap 34, yarn bar 4, bundle opening 5, winding device 6, side yarn entry 7, free end 71, filter column 8, filter nozzle 81. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] See Figure 1 — Figure 7 A filter rod for filtering flue gas, wherein the direction of the filter rod 2 from head to tail is consistent with the direction of the flue gas; the filter rod 2 is made of bulky yarn 3;

[0042] The bulky yarn 3 includes a high-shrinkage core yarn 31 and a low-shrinkage outer yarn 32. There is at least one core yarn 31 and one outer yarn 32. The core yarn 31 is located in the middle of the bulky yarn 3. The outer yarn 32 is wound around the outside of the core yarn 31. The outer yarn 32 is arranged as multiple loops 33 connected in sequence along the core yarn 31. The diameter of a single loop 33 is larger than the diameter of the core yarn 31, and the same core yarn 31 passes through the interior of each loop 33.

[0043] The core yarn 31 is made from any one or any mixture of polylactic acid, polypropylene carbonate, polylactic acid-hydroxyacetic acid copolymer, polybutylene adipate / terephthalate, polycaprolactone, poly-β-hydroxybutyrate, polyhydroxyalkanoate, and polybutylene succinate.

[0044] The outer yarn 32 is made from any one or any mixture of cellulose fiber, cellulose monoacetate fiber, cellulose diacetate fiber, cellulose triacetate fiber, alginate fiber, chitosan fiber, milk silk fiber, soybean fiber, and silk fiber.

[0045] The coil 33 includes a coil side strip 332 and a coil high point 331 and a coil low point 333 connected to its two ends. The coil high point 331 and the coil low point 333 are located above and below the core yarn 31, respectively. The arrangement of the coil high point 331 and the coil low point 333 can be any of the following:

[0046] At least one of the loop high point 331 and loop low point 333 is in contact with the outer edge of the core yarn 31;

[0047] Both the high point 331 and the low point 333 are set far away from the core yarn 31. A high loop gap 334 is formed between the high point 331 and the core yarn 31, and a low loop gap 335 is formed between the low point 333 and the core yarn 31.

[0048] The filter rod 2 includes at least two bulky yarns 3, with adjacent bulky yarns 3 in contact with each other; in each bulky yarn 3, there is a loop gap 34 between adjacent loops 33.

[0049] Inside the filter rod 2, among two adjacent bulky yarns 3, at least one loop 33 from the other bulky yarn 3 is inserted into a loop gap 34 on one bulky yarn 3, and the number of loops 33 inserted into a single loop gap 34 is at least one.

[0050] The arrangement of all the bulky yarns 3 in the filter rod 2 can be any of the following:

[0051] All the bulky yarns 3 are stacked side by side, all the bulky yarns 3 are parallel to each other in pairs, and the direction of each bulky yarn 3 from beginning to end is consistent with the direction of the flue gas.

[0052] All the bulky yarns 3 are intertwined or woven into a single yarn rod 4, and the direction of the yarn rod 4 from beginning to end is consistent with the direction of the flue gas.

[0053] When all the bulky yarns 3 are stacked side by side, the filter rod 2 is made and used in the following manner: First, multiple bulky yarns 3 are stacked side by side through the bundling opening 5 to obtain the filter rod 2. All bulky yarns 3 continue to pass through the bundling opening 5, and the filter rod 2 is continuously obtained. Then, when the obtained filter rod 2 passes through the planar outer layer 1, the outer layer 1 is rolled up to wrap the filter rod 2, thereby obtaining the filter column 8. Then, the filter column 8 is cut according to the length requirements to obtain multiple filter nozzles 81.

[0054] When all the bulky yarns 3 are intertwined or woven into a single yarn rod 4, the filter rod 2 is manufactured and used in the following manner: First, multiple bulky yarns 3 are simultaneously intertwined or woven through a winding device 6 to obtain a yarn rod 4, i.e., a filter rod 2. All bulky yarns 3 continue to pass through the winding device 6, and the yarn rod 4 is continuously obtained. Then, when the obtained yarn rod 4 passes through the planar outer sheath 1, the outer sheath 1 is rolled up to wrap the yarn rod 4, thereby obtaining a filter column 8. Then, the filter column 8 is cut according to the length requirements to obtain multiple filter nozzles 81.

[0055] The inner wall of the outer layer 1 is connected to one end of the side-entry filament 7, and the other end of the side-entry filament 7 is in contact with or connected to the filter rod 2. The contact means that the other end of the side-entry filament 7 extends to the surface of the filter rod 2, and the connection means that the other end of the side-entry filament 7 extends into the interior of the filter rod 2. The number of side-entry filaments 7 is multiple.

[0056] The side-inserted fiber 7 is made of polylactic acid; the side-inserted fiber 7 is in contact with or connected to the filter rod 2 in the following manner:

[0057] First, multiple side-entry filaments 7 are connected on the outer layer 1 of the plane by electrostatic flocking or bonding. The free ends 71 ​​of all side-entry filaments 7 are set higher than the outer layer 1. Then, the outer layer 1 is rolled up to wrap the filter rod 2. During the wrapping process, the free ends 71 ​​of the side-entry filaments 7 abut against the side wall of the filter rod 2 or are inserted into the interior of the filter rod 2.

[0058] The principle of this invention is explained as follows:

[0059] The filter rod 2 produced by this invention, after being wrapped with an outer layer 1, becomes a filter column 8. The filter column 8 is then cut according to the length requirements to obtain multiple filter nozzles 81. After the filter rod 2 is wrapped with the outer layer 1, the outer part of the bulky yarn 3 that constitutes the outer circumference of the filter rod 2 comes into contact with the inner wall of the outer layer 1, so that the bulky yarn 3 directly provides support to the outer layer 1, giving full play to the bulky yarn 3's fluffy, outward-expanding, and resilient characteristics.

[0060] Example 1:

[0061] See Figure 1 — Figure 3 A filter rod for filtering flue gas, wherein the direction of the filter rod 2 from head to tail is consistent with the direction of the flue gas; the filter rod 2 is made of bulky yarn 3; the bulky yarn 3 includes a high-shrinkage core yarn 31 and a low-shrinkage outer yarn 32, and there is at least one core yarn 31 and one outer yarn 32. The core yarn 31 is located in the middle of the bulky yarn 3, and the outer yarn 32 is wound around the outside of the core yarn 31. The outer yarn 32 is arranged as multiple loops 33 connected in sequence along the core yarn 31. The diameter of a single loop 33 is larger than the diameter of the core yarn 31, and the same core yarn 31 runs through the interior of each loop 33.

[0062] Example 2:

[0063] The basic content is the same as in Example 1, except that:

[0064] The core yarn 31 is made from any one or any mixture of polylactic acid, polypropylene carbonate, polylactic acid-hydroxyacetic acid copolymer, polybutylene adipate / terephthalate, polycaprolactone, poly-β-hydroxybutyrate, polyhydroxyalkanoate, and polybutylene succinate.

[0065] Furthermore, based on the determination of the raw materials for the core yarn 31, the raw materials for the outer yarn 32 are preferably any one or any mixture of cellulose fiber, cellulose monoacetate fiber, cellulose diacetate fiber, cellulose triacetate fiber, alginate fiber, chitosan fiber, milk silk fiber, soybean fiber, and silk fiber.

[0066] Example 3:

[0067] The basic content is the same as in Example 1, except that:

[0068] The coil 33 includes a coil side strip 332 and a coil high point 331 and a coil low point 333 connected to its two ends. The coil high point 331 and the coil low point 333 are located above and below the core yarn 31, respectively. The arrangement of the coil high point 331 and the coil low point 333 can be any of the following:

[0069] At least one of the loop high point 331 and loop low point 333 is in contact with the outer edge of the core yarn 31;

[0070] Both the high point 331 and the low point 333 are set far away from the core yarn 31. A high loop gap 334 is formed between the high point 331 and the core yarn 31, and a low loop gap 335 is formed between the low point 333 and the core yarn 31.

[0071] As can be seen from the above, the arrangement of the high point 331 and low point 333 in a single coil 33 is diverse. It can be that at least one of the high point 331 and low point 333 is in contact with the outer edge of the core yarn 31 (the first type), or the high point 331 and low point 333 are both set away from the core yarn 31, with a high loop gap 334 between the high point 331 and the core yarn 31, and a low loop gap 335 between the low point 333 and the core yarn 31 (the second type). In particular, the second type has a richer spatial hierarchy when applied, which can further extend the length of the flue gas through the filter rod 2 and improve the adsorption effect of harmful substances in the flue gas.

[0072] Example 4:

[0073] The basic content is the same as in Example 1, except that:

[0074] The filter rod 2 includes at least two bulky yarns 3, with adjacent bulky yarns 3 in contact with each other; in each bulky yarn 3, there is a loop gap 34 between adjacent loops 33. In the filter rod 2, in two adjacent bulky yarns 3, at least one loop 33 from the other bulky yarn 3 is inserted into at least one loop gap 34 on one bulky yarn 3, and the number of loops 33 inserted into a single loop gap 34 is at least one.

[0075] Example 5:

[0076] The basic content is the same as in Example 1, except that:

[0077] Structurally: See Figure 4 All the bulky yarns 3 are stacked side by side, and all the bulky yarns 3 are parallel to each other in pairs, and the direction of each bulky yarn 3 from beginning to end is consistent with the direction of the flue gas.

[0078] In terms of method: When all the bulky yarns 3 are stacked side by side, the filter rod 2 is made and applied in the following manner: First, multiple bulky yarns 3 are stacked side by side through the bundling port 5 to obtain the filter rod 2. All bulky yarns 3 continue to pass through the bundling port 5, and the filter rod 2 is continuously obtained. Then, when the obtained filter rod 2 passes through the planar outer layer 1, the outer layer 1 is rolled up to wrap the filter rod 2, thereby obtaining the filter column 8. Then, the filter column 8 is cut according to the length requirements to obtain multiple filter nozzles 81.

[0079] In addition, a comparative experiment was conducted on the structure of bulky yarn 3 stacked side by side, as shown below. In this example, the bulky yarn 3 is stacked side by side, the only difference being the number of bulky yarn 3 included in a filter rod 2. As can be seen from the comparison between this example and the existing cellulose acetate filter rod, this design can achieve the same application effect as the existing cellulose acetate filter rod in terms of suction resistance (response pressure drop) and filtration efficiency (response adsorption capacity).

[0080] .

[0081] Example 6:

[0082] The basic content is the same as in Example 1, except that:

[0083] Structurally: See Figure 5 All the bulky yarns 3 are intertwined or woven into a single yarn rod 4, and the direction of the yarn rod 4 from beginning to end is consistent with the direction of the flue gas.

[0084] In terms of method: When all the bulky yarns 3 are twisted or woven into a single yarn rod 4, the filter rod 2 is made and used in the following manner: First, multiple bulky yarns 3 are simultaneously twisted or woven through the winding device 6 to obtain the yarn rod 4, i.e., the filter rod 2. All the bulky yarns 3 continue to pass through the winding device 6, and the yarn rod 4 is continuously obtained. Then, when the obtained yarn rod 4 passes through the planar outer layer 1, the outer layer 1 is rolled up to wrap the yarn rod 4, thereby obtaining the filter column 8. Then, the filter column 8 is cut according to the length requirements to obtain multiple filter nozzles 81.

[0085] Example 7:

[0086] The basic content is the same as in Example 1, except that:

[0087] Structurally: See Figure 6 and Figure 7 The inner wall of the outer layer 1 is connected to one end of the side-insertion filament 7, and the other end of the side-insertion filament 7 is in contact with or connected to the filter rod 2. Contact means that the other end of the side-insertion filament 7 extends to the surface of the filter rod 2, and connection means that the other end of the side-insertion filament 7 extends into the interior of the filter rod 2. There are multiple side-insertion filaments 7. Preferably, the side-insertion filament 7 is made of polylactic acid.

[0088] In terms of method: the side-entry wire 7 contacts or connects to the filter rod 2 in the following manner: first, multiple side-entry wires 7 are connected on the outer sheath 1 of the plane by electrostatic flocking or bonding, and the free ends 71 ​​of all side-entry wires 7 are set higher than the outer sheath 1. Then, the outer sheath 1 is rolled up to wrap the filter rod 2. During the wrapping process, the free ends 71 ​​of the side-entry wires 7 abut against the side wall of the filter rod 2 or are inserted into the interior of the filter rod 2.

[0089] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A filter rod for filtering of smoke gas, the filter rod (2) having a head-to-tail orientation in line with the orientation of the smoke gas, characterized in that: The filter rod (2) is made of bulked yarn (3); The bulked yarn (3) comprises high-shrinkage core yarn (31) and low-shrinkage outer yarn (32), the number of core yarn (31) and outer yarn (32) is at least one, the core yarn (31) is located in the middle of the bulked yarn (3) where it is located, and the outer yarn (32) is wound outside the core yarn (31), the outer yarn (32) presents as a plurality of coils (33) connected in sequence along the core yarn (31), the diameter of a single coil (33) is greater than the diameter of the core yarn (31), and the inside of each coil (33) is penetrated by the same core yarn (31); The coil (33) comprises a coil side strip (332) and a coil high point (331) and a coil low point (333) connected at both ends thereof, the coil high point (331) and the coil low point (333) are located above and below the core yarn (31) respectively, and the arrangement structure of the coil high point (331) and the coil low point (333) is any one of the following: At least one of the coil high point (331) and the coil low point (333) contacts the outer side of the core yarn (31); The coil high point (331) and the coil low point (333) are arranged away from the core yarn (31), a high coil gap (334) is formed between the coil high point (331) and the core yarn (31), and a low coil gap (335) is formed between the coil low point (333) and the core yarn (31); The filter rod (2) comprises at least two bulked yarns (3), and adjacent bulked yarns (3) contact each other; in each bulked yarn (3), there is a coil gap (34) between adjacent coils (33); In the filter rod (2), at least one coil gap (34) on one bulked yarn (3) is inserted with a coil (33) on another bulked yarn (3) among the two adjacent bulked yarns (3), and the number of coils (33) inserted in a single coil gap (34) is at least one; The arrangement structure of all bulked yarns (3) in the filter rod (2) is any one of the following: All bulked yarns (3) are stacked side by side, all bulked yarns (3) are parallel to each other, and the direction of each bulked yarn (3) from head to tail is consistent with the direction of the smoke; All bulked yarns (3) are twisted or woven into a yarn rod (4), and the direction of the yarn rod (4) from head to tail is consistent with the direction of the smoke; When all bulked yarns (3) are stacked side by side, the filter rod (2) is made and applied according to the following manner: a plurality of bulked yarns (3) are simultaneously stacked side by side through a bunching port (5) to obtain a filter rod (2), all bulked yarns (3) continuously pass through the bunching port (5), and the filter rod (2) is continuously obtained, then when the obtained filter rod (2) passes through the planar outer wrapper (1), the outer wrapper (1) is rolled up to wrap the filter rod (2), thereby obtaining a filter column (8), and the filter column (8) is cut according to the length requirement to obtain a plurality of filter tips (81); When all the bulked yarns (3) are intertwined or woven into a yarn rod (4), the filter rod (2) is made and applied in the following manner: a plurality of bulked yarns (3) are simultaneously intertwined or woven through the winding device (6) to obtain a yarn rod (4), that is, a filter rod (2), all the bulked yarns (3) continuously pass through the winding device (6), and the yarn rod (4) is continuously obtained, then when the obtained yarn rod (4) passes through the planar outer wrapper (1), the outer wrapper (1) is rolled up to wrap the yarn rod (4), thereby obtaining a filter column (8), and the filter column (8) is cut according to the length requirement to obtain a plurality of filter tips (81); The inner side wall of the outer wrapper (1) is connected to one end of the side-in yarn (7), and the other end of the side-in yarn (7) is in contact with or connected to the filter rod (2), the contact means that the other end of the side-in yarn (7) extends to the surface of the filter rod (2), and the connection means that the other end of the side-in yarn (7) extends to the inside of the filter rod (2), and the number of side-in yarns (7) is multiple.

2. A filter rod for flue gas filtration according to claim 1, characterized in that: The raw material of the core yarn (31) is any one or any mixture of polylactic acid, polypropylene carbonate, polylactic acid-glycolic acid copolymer, polybutylene adipate / terephthalate, polycaprolactone, poly-β-hydroxybutyric acid, polyhydroxyalkanoate, and polybutylene succinate.

3. A filter rod for flue gas filtration according to claim 2, characterised in that: The raw material of the outer yarn (32) is any one or any mixture of cellulose acetate fiber, di-acetic acid cellulose fiber, tri-acetic acid cellulose fiber, alginic acid fiber, chitosan fiber, milk silk fiber, soybean fiber, and silk fiber.

4. A filter rod for flue gas filtration according to claim 1, characterized in that: The manufacturing material of the side-in yarn (7) is polylactic acid; the side-in yarn (7) is in contact with or connected to the filter rod (2) in the following manner: First, a plurality of side-in yarns (7) are connected on the planar outer wrapper (1) by electrostatic flocking or bonding, the free ends (71) of all the side-in yarns (7) are higher than the outer wrapper (1), and then the outer wrapper (1) is rolled up to wrap the filter rod (2), in the wrapping process, the free ends (71) of the side-in yarns (7) abut on the side wall of the filter rod (2) or are inserted into the inside of the filter rod (2).

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