A filter tip containing bulked yarn

Abstract

A filter tip containing bulked yarns, comprising an outer layer and a filter unit wrapped inside; the filter unit comprises at least two bulked yarns, the filter unit has a head-to-tail direction consistent with the direction of the smoke, and the adjacent bulked yarns are in contact with each other, the outer side of the bulked yarns surrounding the filter unit is in contact with the inner side wall of the outer layer; the bulked yarns comprise a high-shrinkage core yarn and a low-shrinkage outer yarn, the number of the core yarn and the outer yarn is at least one, the core yarn is located in the middle of the bulked yarn where it is located, and the outer yarn is wound outside the core yarn, the outer yarn presents a plurality of coils connected in sequence along the core yarn, and the diameter of a single coil is greater than the diameter of the core yarn. The design can replace the application of cellulose acetate in the filter tip for cigarettes.

Description

TECHNICAL FIELD

[0001] The present application relates to a filter, belonging to the field of smoking articles, in particular to a filter containing bulked yarn. BACKGROUND

[0002] In existing smoking articles, whether cigarettes or heat-not-burn cigarettes, a filter is arranged at the inlet end to reduce the temperature of smoke and adsorb harmful substances. The existing filter is mostly made of acetate fiber.

[0003] Acetate fiber is a fiber made of wood and cotton linters as raw materials, which are reacted with chemical raw materials such as acetic acid to obtain spinning raw material acetate sheet, and then spun into fiber. The tow used for the filter of smoking articles is mainly diacetate fiber. The acetate fiber filter is a mechanical filter widely accepted by low-tar and high-tar cigarette consumers today. It is non-toxic, odorless, impact-resistant, oil-resistant, non-static, has small suction resistance, strong adsorption, and good elasticity and thermal stability.

[0004] However, the equipment and materials of acetate fiber mainly rely on imports, and the cost is very high. Even if most of the acetate sheets are used to produce filter rods for cigarettes at the present stage, they cannot meet the market demand, and also limit the development of acetate sheets in other textile application fields.

[0005] The fundamental reason for the current situation is that there is a lack of a new design to replace the application of diacetate fiber in filter rods for cigarettes (core section in filter), which leads to the fact that diacetate fiber is mostly limited to filter rods for cigarettes. Therefore, a new design is urgently needed to replace the role of diacetate fiber in filter rods for cigarettes.

[0006] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the patent application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is already known to those of ordinary skill in the art. SUMMARY

[0007] The purpose of the present application is to overcome the defects and problems in the prior art that diacetate fiber cannot be replaced in the application of filter rods for cigarettes, and to provide a filter containing bulked yarn which can replace the application of diacetate fiber in filter rods for cigarettes.

[0008] To achieve the above purpose, the technical solution of the present application is: a filter containing bulked yarn, comprising an outer layer and a filter unit wrapped inside.

[0009] The filter unit comprises at least two bulked yarns, and the filter unit has a head-to-tail direction consistent with the direction of the smoke. The adjacent bulked yarns are in contact with each other, and the outer side of the bulked yarn surrounding the filter unit is in contact with the inner side wall of the outer layer.

[0010] The bulked yarn comprises a high-shrinkage core yarn and a low-shrinkage outer yarn, the number of the core yarn and the outer yarn is at least one, the core yarn is located in the middle of the bulked yarn, and the outer yarn is wound outside the core yarn, and the outer yarn presents a plurality of coils connected in sequence along the core yarn, and the diameter of a single coil is greater than the diameter of the core yarn.

[0011] The coil comprises a side strip and a high point and a low point connected to both ends of the side strip, and the high point and the low point are located above and below the core yarn respectively, and the arrangement structure of the high point and the low point is any one of the following:

[0012] At least one of the high point and the low point contacts the outer side of the core yarn;

[0013] The high point and the low point are both arranged away from the core yarn, and a high-coil gap is formed between the high point and the core yarn, and a low-coil gap is formed between the low point and the core yarn.

[0014] In the bulked yarn, there is a coil gap between adjacent coils.

[0015] In the two adjacent bulked yarns, at least one coil gap in one bulked yarn is inserted with a coil in the other bulked yarn, and the number of the coils inserted in a single coil gap is at least one.

[0016] In the bulked yarn, the outer yarn is spirally wound outside the core yarn, and the loop in the spiral structure refers to the coil.

[0017] The arrangement structure of all the bulked yarns in the filter unit is any one of the following:

[0018] All the bulked yarns are stacked side by side, and the direction from head to tail of each bulked yarn is consistent with the direction of the flue gas;

[0019] All the bulked yarns are intertwined or woven into a yarn rod, and the direction from head to tail of the yarn rod is consistent with the direction of the flue gas.

[0020] The filter unit comprises at least two sub-units, and the direction from head to tail of all the sub-units is consistent with the direction of the flue gas; the sub-unit comprises at least two bulked yarns, and the arrangement structure of all the bulked yarns in a single sub-unit is any one of the following:

[0021] All the bulked yarns are stacked side by side, and the direction from head to tail of each bulked yarn is consistent with the direction of the flue gas;

[0022] All the bulked yarns are intertwined or woven into a sub-yarn rod, and the direction from head to tail of the sub-yarn rod is consistent with the direction of the flue gas.

[0023] The filter unit comprises at least one winding rod, the winding rod is wound by the middle cloth, the middle cloth is woven by the plurality of bulk yarns, and the winding rod is consistent with the direction of the smoke from the head to the tail.

[0024] The filter unit comprises a plurality of folded filter sheets, the length of the single filter sheet is less than or equal to the length of the filter unit, and the filter sheet is woven by the plurality of bulk yarns.

[0025] The filter tip further comprises a plurality of side-in filaments, and the arrangement structure of the side-in filaments is any one or any combination of the following:

[0026] One end of the single side-in filament is connected with the inner side wall of the outer wrapper, and the other end of the single side-in filament is located in the interior of the filter unit;

[0027] One end of the single side-in filament is connected with the inner side wall of the outer wrapper, and the other end of the single side-in filament is connected with the inner side wall of the outer wrapper after penetrating through the filter unit or after being in contact with the filter unit;

[0028] One end of the single side-in filament is connected with the inner side wall of the outer wrapper, and the other end of the single side-in filament is in contact with the outer side wall of the filter unit.

[0029] Compared with the prior art, the beneficial effects of the present application are:

[0030] 1. In the filter containing the bulked yarn, the filter includes an outer layer and a filter unit wrapped inside, wherein the filter unit includes at least two bulked yarns, each of which includes a core yarn in the middle and an outer yarn wrapped outside, and the wrapping structure of the outer yarn on the core yarn presents a plurality of coils connected in sequence along the axial direction of the core yarn, and the diameter of a single coil is larger than that of the core yarn, and the advantages of the design include: first, the unique structure of the bulked yarn has strong bulkiness, which can provide an expanding tension that is conducive to the stability and firmness of the combination between the filter unit and the outer layer; second, the plurality of coils arranged along the axial direction of the bulked yarn can enrich the internal space of the filter unit, prolong the length of the smoke passing through the filter unit, and improve the adsorption effect of harmful substances in the smoke; third, a single bulked yarn is made of a core yarn and an outer yarn, and has strong adjustability, and the fineness of the fiber can be adjusted (both the raw material fibers of different fineness can be selected and the production process can be controlled) during the production process to make the diameter of the bulked yarn much smaller than that of the existing diacetate fiber, thereby expanding the specific surface area of the filter unit as a whole and improving the overall adsorption capacity of the filter unit. It can be seen that, by combining the structural characteristics of the bulked yarn and setting the bulked yarn in a suitable structure as the filter unit, the function of the filter can be played, and the manufacturing equipment and manufacturing process of the bulked yarn already exist in China, the investment cost is greatly reduced, and the production capacity can be improved to release the production capacity of the existing diacetate fiber. Therefore, the application can replace the application of diacetate fiber in the filter for cigarettes.

[0031] 2. In the filter containing the bulked yarn, the bulked yarn is used as the basic component unit of the filter unit, and a single bulked yarn is made of a core yarn and an outer yarn, and has strong adjustability, and can greatly adjust the porosity of the filter unit in various ways, such as adjusting the fiber ratio between high-shrinkage fibers and low-shrinkage fibers in the raw material of the bulked yarn, adjusting the twist factor of the yarn during the production of the bulked yarn, and adjusting the bulkiness during the wet heat setting treatment during the production of the bulked yarn. It can be seen that the design has strong adjustment function in the porosity of the filter unit, thereby having strong adjustment ability in the pressure drop of the filter, which neither limits the filtration efficiency of nicotine and glycerol due to low pressure drop nor causes difficulty in smoking due to high pressure drop, and is conducive to the acceptance of smokers. Therefore, the application not only has strong pressure drop adjustment ability, but also can consider adsorption and smoking comfort, and is conducive to the acceptance of smokers.

[0032] 3. In a filter tip containing bulked yarn according to the present invention, a single coil includes a coil side strip and a high point and a low point connected to both ends of the coil. 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 varied. Either at least one of the high point or the low point is in contact with the outer edge of the core yarn (first type), or both the high point and the low point are located away from the core yarn, with a high loop gap between the high point and the core yarn and a low loop gap between the low point and the core yarn (second type). The second type, in particular, provides richer spatial layers during application, further extending the path of flue gas through the filter unit and improving the adsorption effect on harmful substances in the flue gas. Therefore, the adsorption effect of the present invention is stronger.

[0033] 4. In the filter tip containing bulked yarn of the present invention, the arrangement structure of all the bulked yarns in the filter unit is diverse, each with its own emphasis. For example, the bulked yarns can be stacked side-by-side, or they can exist in the form of yarn rods, coils, or filter sheets, thus adapting to different needs, such as the coordination between various pressure drops, adsorption effects, and support effects. Especially when there are loop gaps or coil interlocking between adjacent bulked yarns, a longer flue gas passage path is provided, enhancing the adsorption effect, while also strengthening the support effect. Therefore, the present invention has strong adjustability and can take into account the multiple performance characteristics of the filter tip.

[0034] 5. In the filter tip containing bulked yarn of the present invention, multiple side-entry yarns can be added to the filter tip. The arrangement structure of the side-entry yarns is diverse. The basic principle is that at least one end of the side-entry yarn is connected to the inner wall of the outer sheath. As for the other end of the side-entry yarn, it is not limited to being connected to the inner wall of the outer sheath. However, the side-entry yarn must be in contact with the filter unit, preferably able to intersect with each other, such as being located inside the filter unit or passing through the filter unit. In this way, it can provide the filter unit with a similar longitudinal support force, playing a role in stabilizing the filter tip. Secondly, it can further divide the existing flue gas flow path in the filter unit, increase the spatial layers, and extend the flue gas path. In addition, based on this design, if the material of the side-entry yarn can be limited to PLA, then the heat absorption effect of PLA can be utilized to reduce the temperature of the flue gas and improve the comfort of inhalation. At the same time, PLA will undergo a shape change after absorbing heat. This change can enhance the connection between the internal structures of the filter unit, or the connection effect between the filter unit and the side-entry yarn, thereby improving the overall strength of the filter tip. Therefore, the present invention not only has good adsorption and cooling effects, but also has strong overall firmness and stability. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention.

[0036] Figure 2 yes Figure 1Structure diagram of the middle bulked yarn.

[0037] Figure 3 Structure diagram of all bulked yarns in the filter unit of the present invention.

[0038] Figure 4 Structure diagram of all bulked yarns in the filter unit of the present invention.

[0039] Figure 5 Distribution diagram of the sub-unit in the filter unit of the present invention.

[0040] Figure 6 Structure diagram of the winding rod of the present invention.

[0041] Figure 7 Distribution diagram of the filter sheet in the filter unit of the present invention.

[0042] Figure 8 Combination diagram of the side-in yarn and the filter unit of the present invention.

[0043] Figure 9 Connection diagram of the side-in yarn and the outer coating of the present invention.

[0044] In the figure: outer coating 1, filter unit 2, sub-unit 21, sub-yarn rod 22, bulked 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-loop gap 34, yarn rod 4, winding rod 5, intermediate cloth 51, filter sheet 6, side-in yarn 7. DETAILED DESCRIPTION

[0045] The present invention is further explained in detail in the following description and specific embodiments in conjunction with the accompanying drawings.

[0046] Reference Figure 1 — Figure 9 A filter tip containing bulked yarns, comprising an outer coating 1 and a filter unit 2 wrapped inside it;

[0047] The filter unit 2 comprises at least two bulked yarns 3, the filter unit 2 has a head-to-tail direction consistent with the direction of the smoke, and the adjacent bulked yarns 3 are in contact with each other, and the outer side of the bulked yarns 3 surrounding the filter unit 2 is in contact with the inner side wall of the outer coating 1.

[0048] The bulked yarn 3 comprises a high-shrinkage core yarn 31 and a low-shrinkage outer yarn 32, the number of the core yarn 31 and the outer yarn 32 is at least one, the core yarn 31 is located in the middle of the bulked yarn 3, and the outer yarn 32 is wound outside the core yarn 31, and the outer yarn 32 presents a plurality of coils 33 connected in sequence along the core yarn 31, and the diameter of a single coil 33 is greater than the diameter of the core yarn 31.

[0049] The coil 33 comprises a coil side strip 332 and coil high points 331 and coil low points 333 connected at both ends of the coil side strip 332, and the coil high points 331 and the coil low points 333 are located above and below the core yarn 31 respectively, and the arrangement structure of the coil high points 331 and the coil low points 333 is any one of the following:

[0050] At least one of the coil high points 331 and the coil low points 333 contacts the outer side wall of the core yarn 31;

[0051] The coil high points 331 and the coil low points 333 are both arranged away from the core yarn 31, a high-coil gap 334 is formed between the coil high points 331 and the core yarn 31, and a low-coil gap 335 is formed between the coil low points 333 and the core yarn 31.

[0052] In the bulked yarn 3, there is a coil-to-coil gap 34 between adjacent coils 33.

[0053] In two adjacent bulked yarns 3, at least one coil 33 on one bulked yarn 3 is inserted into the coil-to-coil gap 34 of the other bulked yarn 3, and the number of the coils 33 inserted into a single coil-to-coil gap 34 is at least one (this is the coil-to-coil gap 34 and the coil 33 are inserted into each other).

[0054] In the bulked yarn 3, the outer yarn 32 is spirally wound outside the core yarn 31, and the loop in the spiral structure refers to the coil 33.

[0055] The arrangement structure of all the bulked yarns 3 in the filter unit 2 is any one of the following:

[0056] All the bulked yarns 3 are stacked side by side, and the direction from head to tail of each bulked yarn 3 is consistent with the direction of the flue gas;

[0057] All the bulked yarns 3 are intertwined or woven into a yarn rod 4, and the direction from head to tail of the yarn rod 4 is consistent with the direction of the flue gas.

[0058] The filter unit 2 comprises at least two sub-units 21, and the direction from head to tail of all the sub-units 21 is consistent with the direction of the flue gas; the sub-unit 21 comprises at least two bulked yarns 3, and the arrangement structure of all the bulked yarns 3 in a single sub-unit 21 is any one of the following:

[0059] All the bulked yarns 3 are stacked side by side, and the direction from head to tail of each bulked yarn 3 is consistent with the direction of the flue gas;

[0060] All the bulked yarns 3 are intertwined or woven into a sub-yarn rod 22, the head-to-tail direction of which is consistent with the direction of the smoke.

[0061] The filter unit 2 comprises at least one roll rod 5, the head-to-tail direction of which is consistent with the direction of the smoke, and the roll rod 5 is wound by an intermediate cloth 51, which is woven by a plurality of bulked yarns 3.

[0062] The filter unit 2 comprises a plurality of folded filter sheets 6, the length of a single filter sheet 6 being less than or equal to the length of the filter unit 2, and the filter sheet 6 is woven by a plurality of bulked yarns 3.

[0063] The filter tip further comprises a plurality of side-in filaments 7, which are arranged in any one or any combination of the following manners:

[0064] One end of a single side-in filament 7 is connected to the inner side wall of the outer wrapper 1, and the other end of the single side-in filament 7 is located inside the filter unit 2;

[0065] One end of a single side-in filament 7 is connected to the inner side wall of the outer wrapper 1, and the other end of the single side-in filament 7 is connected to the inner side wall of the outer wrapper 1 after passing through or contacting the filter unit 2;

[0066] One end of a single side-in filament 7 is connected to the inner side wall of the outer wrapper 1, and the other end of the single side-in filament 7 is in contact with the outer side wall of the filter unit 2.

[0067] The principle of the present application is described as follows:

[0068] The bulked yarn in the present application refers to that: first, two kinds of fibers with different shrinkage rates are blended into yarn, and then the yarn is treated in steam or hot air or boiling water, at this time, the fiber with high shrinkage rate produces large shrinkage and is located in the center of the yarn (i.e. core yarn 31), and the low shrinkage fiber mixed together (i.e. outer yarn 32) is squeezed to the surface of the yarn to form a loop (i.e. loop 33) due to small shrinkage, thereby forming a bulked yarn with fluffy, full and elastic structure.

[0069] The material of the side-in filament 7 in the present application is preferably PLA (polylactic acid), and in addition, the setting process of the side-in filament 7 is preferably: a plurality of side-in filaments 7 are implanted on the unfolded and laid outer wrapper 1 by electrostatic flocking, then the filter unit 2 is placed on the laid outer wrapper 1, and then the outer wrapper 1 is rolled up to wrap the filter unit 2 inside the outer wrapper 1 to form a filter tip, or after wrapping, multiple cutting is performed to obtain a plurality of filter tips.

[0070] The "smoke flow direction" in the present application refers to the overall flow direction of the smoke in the smoking article when a smoker uses the smoking article, i.e. the overall direction from the part where the smoke is generated to the end filter.

[0071] Embodiment 1:

[0072] Referring to Figure 1 With Figure 2 A filter containing bulked yarns, comprising an outer layer 1 and a filter unit 2 wrapped inside; the filter unit 2 comprises at least two bulked yarns 3, the filter unit 2 has a head-to-tail direction consistent with the smoke flow direction, and adjacent bulked yarns 3 are in contact with each other, the outer side of the bulked yarns 3 surrounding the outside of the filter unit 2 is in contact with the inner side wall of the outer layer 1; the bulked yarn 3 comprises a high-shrinkage core yarn 31 and a low-shrinkage outer yarn 32, the number of core yarns 31 and outer yarns 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 wrapped outside the core yarn 31, and the outer yarn 32 along the core yarn 31 presents as a plurality of coils 33 connected in sequence, and the diameter of a single coil 33 is greater than the diameter of the core yarn 31.

[0073] Embodiment 2:

[0074] The basic content is the same as that of Embodiment 1, except that:

[0075] Referring to Figure 1 With Figure 2 Each coil 33 comprises a coil side strip 332 and a coil high point 331 and a coil low point 333 connected to 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 of the following:

[0076] One or both of the coil high point 331 and the coil low point 333 are in contact with the outer side of the core yarn 31;

[0077] The coil high point 331 and the coil low point 333 are both arranged away from the core yarn 31, at this time, neither the coil high point 331 nor the coil low point 333 is in contact with the outer side of 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, in application, the high-coil gap 334 and the low-coil gap 335 not only can increase the bulkiness and provide support for the outward expansion, but also can enrich the internal space of the filter unit 2 and prolong the flow path of the smoke.

[0078] Embodiment 3:

[0079] The basic content is the same as that of Embodiment 1, except that:

[0080] Referring to Figure 1 WithFigure 2 In the two adjacent bulked yarns 3, at least one loop gap 34 in one of the bulked yarns 3 is inserted with a loop 33 in the other bulked yarn 3, and the number of loops 33 inserted in the single loop gap 34 is at least one (i.e. the loop gap 34 and the loop 33 are inserted in pairs).

[0081] In actual application, it is not limited that each loop gap 34 is inserted with a loop 33, and it is not limited that the insertion depth of the loop 33 in the loop gap 34.

[0082] Example 4:

[0083] The basic content is the same as that in Example 1, except that:

[0084] Referring to Figure 3 The arrangement structure of all the bulked yarns 3 in the filter unit 2 is that all the bulked yarns 3 are stacked side by side (there are three bulked yarns 3 in total), and the direction from the head to the tail of each bulked yarn 3 is consistent with the direction of the flue gas.

[0085] Example 5:

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

[0087] Referring to Figure 4 The arrangement structure of all the bulked yarns 3 in the filter unit 2 is that all the bulked yarns 3 are intertwined or woven into a yarn rod 4 (two bulked yarns 3 are intertwined into a yarn rod 4), and the direction from the head to the tail of the yarn rod 4 is consistent with the direction of the flue gas.

[0088] Example 6:

[0089] The basic content is the same as that in Example 1, except that:

[0090] Referring to Figure 5 The figure is a schematic view of the cross section of the filter unit 2, and one filter unit 2 includes three sub-units 21, and the direction from the head to the tail of each sub-unit 21 is consistent with the direction of the flue gas. Among them, the structures of the three sub-units 21 are different, and are respectively:

[0091] Two bulked yarns 3 are stacked side by side, and the direction from the head to the tail of each bulked yarn 3 is consistent with the direction of the flue gas;

[0092] Two bulked yarns 3 are intertwined into a sub-yarn rod 22, and the direction from the head to the tail of the sub-yarn rod 22 is consistent with the direction of the flue gas;

[0093] Three bulked yarns 3 are intertwined into a sub-yarn rod 22, and the direction from the head to the tail of the sub-yarn rod 22 is consistent with the direction of the flue gas.

[0094] 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 structure of bulky yarn 3 stacked side by side is the only difference in the number of bulky yarn 3. As can be seen from the comparison between this example and the existing cellulose acetate filter rod (the core in the filter nozzle), this design can achieve the same application effect as the existing cellulose acetate filter rod in terms of suction resistance (reflecting pressure drop) and filtration efficiency (reflecting adsorption capacity).

[0095] .

[0096] Example 7:

[0097] The basic content is the same as in Example 1, except that:

[0098] See Figure 6 The filter unit 2 includes at least one coil rod 5 ( Figure 6 The diagram shown is a cross-sectional view of the coil 5. The direction of the coil 5 from head to tail is consistent with the direction of the flue gas. The coil 5 is made of an intermediate cloth 51, which is a planar structure woven from multiple bulky yarns 3.

[0099] Example 8:

[0100] The basic content is the same as in Example 1, except that:

[0101] See Figure 7 The figure is a cross-sectional schematic diagram of the filter unit 2. As can be seen in the figure, the filter unit 2 is filled with three folded filter sheets 6. The length of a single filter sheet 6 is less than or equal to the length of the filter unit 2. The filter sheets 6 are all woven from multiple bulky yarns 3.

[0102] Example 9:

[0103] The basic content is the same as in Example 1, except that:

[0104] See Figure 8 The filter tip also includes multiple side-entry wires 7, the arrangement of which can be any one or any combination of the following:

[0105] One end of the single side-inserted wire 7 is connected to the inner wall of the outer sheath 1, and the other end of the single side-inserted wire 7 is located inside the filter unit 2.

[0106] One end of the single side-entry wire 7 is connected to the inner wall of the outer sheath 1, and the other end of the single side-entry wire 7 passes through the filter unit 2 or comes into contact with the filter unit 2 before being connected to the inner wall of the outer sheath 1.

[0107] One end of the single side-insertion wire 7 is connected to the inner wall of the outer sheath 1, and the other end of the single side-insertion wire 7 is in contact with the outer sheath of the filter unit 2.

[0108] Referring to Figure 9 The setting method of the side-in wire 7 is preferably as follows: the side-in wire 7 is planted on the laid outer wrapper 1 by electrostatic flocking (or the side-in wire 7 is adhered to the laid outer wrapper 1 by adhesion), and then the outer wrapper 1 is wrapped on the filter unit 2, so that the side-in wire 7 is in contact with or connected to the filter unit 2. Meanwhile, the length of the outer wrapper 1 and the filter unit 2 is not limited, and the wrapped product can be cut into multiple sections after wrapping, and each section is used as a filter tip.

[0109] The above merely describes preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments. Any equivalent modification or change made by those skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.

Claims

1. A filter tip containing bulked yarns, comprising an outer wrapper (1) and a filter unit (2) wrapped inside, characterized in that: the filter unit (2) comprises at least two bulked yarns (3), the filter unit (2) has a head-to-tail orientation consistent with the orientation of the smoke, and the adjacent bulked yarns (3) are in contact with each other, the outer side of the bulked yarns (3) surrounding the outside of the filter unit (2) is in contact with the inner side wall of the outer wrapper (1); the bulked yarn (3) comprises a high-shrinkage core yarn (31) and a low-shrinkage outer yarn (32), the number of the core yarn (31) and the 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 wrapped outside the core yarn (31), the outer yarn (32) presents as a plurality of coils (33) connected in sequence along the core yarn (31), and the diameter of a single coil (33) is greater than the diameter of the core yarn (31); the filter tip further comprises a plurality of side-in filaments (7), and the arrangement structure of the side-in filaments (7) is any one or any combination of the following: one end of a single side-in filament (7) is connected to the inner side wall of the outer wrapper (1), and the other end of the single side-in filament (7) is located inside the filter unit (2); one end of a single side-in filament (7) is connected to the inner side wall of the outer wrapper (1), and the other end of the single side-in filament (7) is connected to the inner side wall of the outer wrapper (1) after passing through the filter unit (2) or after being in contact with the filter unit (2); one end of a single side-in filament (7) is connected to the inner side wall of the outer wrapper (1), and the other end of the single side-in filament (7) is in contact with the outer surrounding of the filter unit (2); the side-in filaments (7) are made according to the following steps: first, the side-in filaments (7) are planted on the laid outer wrapper (1) by electrostatic flocking, or the side-in filaments (7) are adhered to the laid outer wrapper (1) by adhesion, then the outer wrapper (1) is rolled up, and then the outer wrapper (1) is wrapped on the filter unit (2) to make the side-in filaments (7) contact or connect with the filter unit (2); the coil (33) comprises a coil side strip (332), a coil high point (331), and a coil low point (333) connected to both ends of the coil side strip (332), 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) is in contact with the outer surrounding of the core yarn (31); the coil high point (331) and the coil low point (333) are both 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); in the bulked yarn (3), there is a coil-to-coil gap (34) between adjacent coils (33). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ At least one loop (33) of one of the two adjacent bulked yarns (3) is inserted into the loop gap (34) of the other bulked yarn (3), and the number of loops (33) inserted into the single loop gap (34) is at least one. The side-in yarn (7) is made of PLA, and the side-in yarn (7) absorbs heat to deform.

2. A filter containing bulked yarn according to claim 1, characterized in that: In the bulked yarn (3), the outer yarn (32) is spirally wound around the outside of the core yarn (31), and the loop in the spiral structure refers to the loop (33).

3. A filter containing bulked yarn according to claim 1, characterized in that: The arrangement structure of all the bulked yarns (3) in the filter unit (2) is any of the following: All the bulked yarns (3) are stacked side by side, and the direction of each bulked yarn (3) from head to tail is consistent with the direction of the flue gas; All the bulked yarns (3) are intertwined 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 flue gas.

4. A filter containing bulked yarn according to claim 1, characterized in that: The filter unit (2) includes at least two sub-units (21), and the direction of all the sub-units (21) from head to tail is consistent with the direction of the flue gas; the sub-unit (21) includes at least two bulked yarns (3), and the arrangement structure of all the bulked yarns (3) in the single sub-unit (21) is any of the following: All the bulked yarns (3) are stacked side by side, and the direction of each bulked yarn (3) from head to tail is consistent with the direction of the flue gas; All the bulked yarns (3) are intertwined or woven into a sub-yarn rod (22), and the direction of the sub-yarn rod (22) from head to tail is consistent with the direction of the flue gas.

5. A filter containing bulked yarn according to claim 1, characterized in that: The filter unit (2) includes at least one winding rod (5), and the direction of the winding rod (5) from head to tail is consistent with the direction of the flue gas; the winding rod (5) is wound by an intermediate cloth (51), and the intermediate cloth (51) is woven by a plurality of bulked yarns (3).

6. A filter containing bulked yarn according to claim 1, characterized in that: The filter unit (2) includes a plurality of folded filter sheets (6), and the length of the single filter sheet (6) is less than or equal to the length of the filter unit (2); the filter sheet (6) is woven by a plurality of bulked yarns (3).

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