CN115736345A - Filter tip containing bulked yarn - Google Patents

Abstract

A filter tip containing bulked yarn comprises an outer wrapping layer and a filtering unit wrapped inside the outer wrapping layer; the filter unit comprises at least two bulked yarns, the direction of the filter unit from head to tail is consistent with the direction of smoke, the adjacent bulked yarns are contacted with each other, and the outer side part of the bulked yarn forming the outer side wall of the filter unit is contacted with the inner side wall of the outer cladding; the bulk yarn comprises a high-shrinkage core yarn and a low-shrinkage outer yarn, the number of the core yarn and the number of the outer yarn are at least one, the core yarn is located in the middle of the bulk yarn where the core yarn is located, the outer yarn is wound outside the core yarn, the outer yarn is provided with a plurality of coils which are connected in sequence along the core yarn, and the diameter of each coil is larger than that of the core yarn. The design can replace the application of the diacetate fibers in the aspect of cigarette filters.

Description

A filter tip containing bulky yarn

technical field

The invention relates to a filter tip, which belongs to the field of smoking products, in particular to a filter tip containing bulky yarn.

Background technique

In the existing smoking products, whether it is a cigarette or a heat-not-burn tobacco, a filter tip is arranged at the inlet end to reduce the temperature of the smoke and absorb harmful substances. Existing filter tip adopts cellulose acetate to make more.

Acetate fiber is a fiber made from wood and cotton linters, which are made by reacting with acetic acid and other chemical raw materials, and then spun. The tow used in the filter of tobacco products is mainly diacetate fiber . Acetate filter is a mechanical filter widely accepted by consumers of low-tar and high-tar cigarettes today. It is non-toxic, tasteless, impact-resistant, oil-resistant, non-static, has small suction resistance, strong adsorption, and has good elasticity. and thermal stability.

However, the equipment and materials of cellulose acetate mainly rely on imports, and the cost is very high. In particular, the equipment manufacturing technology has been monopolized by foreign countries for a long time, and the cost of expansion is high, resulting in insufficient production capacity. Filter stick, also can not satisfy market demand, and, has also limited the development of vinegar sheet in other textile application fields.

The root cause of the current situation is that there is a lack of a new design to replace the application of diacetate fiber in cigarette filter rods (core segments in filters), resulting in most of the diacetate fiber being limited to cigarette filter rods. Therefore, a new design is urgently needed to replace the role of diacetate fiber in cigarette filter rods, so as to break the bottleneck of foreign countries in terms of equipment technology.

The disclosure of information in this background section is only intended to increase the understanding of the general background of this patent application, and should not be considered as an acknowledgment or any form of suggestion that the information constitutes prior art known to those skilled in the art.

Contents of the invention

The purpose of the present invention is to overcome the defects and problems existing in the prior art that cannot replace diacetate fiber in the application of cigarette filters, and provide a filter tip containing bulky yarn that can replace diacetate fiber in the application of cigarette filters.

To achieve the above objectives, the technical solution of the present invention is: a filter tip containing bulky yarn, including an outer cladding and a filter unit wrapped inside it;

The filter unit includes at least two bulky yarns. The direction of the filter unit from head to tail is consistent with the direction of the smoke. contact with the inner wall of the

The bulky yarn includes 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 bulky yarn where it is located, and the outer yarn is wound around 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 larger than that of the core yarn.

The loop includes a loop side strip and a loop high point and a loop low point connected to its two ends. The loop high point and the loop low point are respectively located above and below the core yarn. The arrangement structure of the loop high point and the loop low point is any of the following:

At least one of the loop high point and the loop low point is in contact with the outer circumference of the core yarn;

Both the loop high point and the loop low point are set away from the core yarn, and there is a high loop gap between the loop high point and the core yarn, and there is a low loop gap between the loop low point and the core yarn.

In the bulked yarn, loop gaps exist between adjacent loops.

In two adjacent bulky yarns, at least one loop gap of one bulky yarn is inserted with a loop on another bulky yarn, and the number of loops inserted into a single loop gap is at least one.

In the bulked yarn, the outer yarn is wound around the outside of the core yarn in a helical structure, and the rings in the helical structure refer to coils.

The arrangement structure of all bulky yarns in the filter unit is any one of the following:

All the bulked yarns are piled up side by side, and the direction of each bulked yarn from the beginning to the end is consistent with the direction of the smoke;

All the bulked yarns are intertwined or woven into a yarn rod, and the direction of the yarn rod from the beginning to the end is consistent with the direction of the smoke.

The filter unit includes at least two subunits, and the direction of all subunits from head to tail is consistent with the direction of smoke; the subunits include at least two bulky yarns, and the arrangement structure of all bulky yarns in a single subunit is Any of the following:

All the bulked yarns are piled up side by side, and the direction of each bulked yarn from the beginning to the end is consistent with the direction of the smoke;

All the bulky yarns are intertwined or woven into a sub-yarn rod, and the direction of the sub-yarn rod from the beginning to the end is consistent with the direction of the smoke.

The filter unit includes at least one rolling rod, the direction of the rolling rod from the beginning to the end is consistent with the direction of the smoke, and the rolling rod is wound by an intermediate cloth, and the intermediate cloth is woven by a plurality of bulked yarns.

The filter unit includes a plurality of folded filter sheets, the length of a single filter sheet is less than or equal to the length of the filter unit, and the filter sheet is woven from multiple bulked yarns.

The filter tip also includes a plurality of side-entry wires, and the arrangement structure of the side-entry wires is any one or any combination of the following:

One end of the single side-entry wire is connected to the inner wall of the outer cladding, and the other end of the single side-entry wire is located inside the filter unit;

One end of the single side-entry wire is connected to the inner wall of the outer cladding, and the other end of the single side-entry wire is connected to the inner wall of the outer cladding after passing through the filter unit or after being in contact with the filter unit;

One end of the single side-entry wire is connected to the inner wall of the outer cladding, and the other end of the single side-entry wire is in contact with the outer circumference of the filter unit.

Compared with prior art, the beneficial effect of the present invention is:

1. A filter tip containing bulky yarn of the present invention includes an outer cladding and a filter unit wrapped inside it, wherein the filter unit includes at least two bulky yarns, and each bulky yarn includes a core yarn located in the middle The wrapping structure of the outer yarn on the core yarn is a plurality of coils connected in sequence along the axis of the core yarn. The diameter of a single coil is larger than the diameter of the core yarn. The advantages of this design include: First of all, the unique structure of the bulky yarn has strong bulkiness, which can provide the tension of expansion, which is conducive to the stability and firmness of the connection between the filter unit and the outer cladding; secondly, the bulky yarn The multiple coils arranged along its axial direction 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 on harmful substances in the smoke; Yarn and outer yarn production, strong adjustability, the fineness of the fiber can be adjusted during the production process (it can not only screen the raw material fibers of different fineness, but also control the production process), so that the diameter of the bulked yarn can be made much smaller than The existing diacetate fiber can expand the overall specific surface area of the filter unit, thereby improving the overall adsorption capacity of the filter unit. It can be seen that this design combines the structural characteristics of the bulky yarn itself and is based on the bulky yarn. After setting it as a filter unit with a suitable structure, it can play the function of a filter. The manufacturing equipment and manufacturing process of the bulky yarn are in the domestic It already exists, will not be restricted by foreign technology, and the input cost will be greatly reduced. From raw materials to equipment to technology, it can be completed in China, breaking through the current situation of bottlenecks, which is conducive to the improvement of production capacity, and liberates the existing production capacity of acetate fiber. Therefore, the present invention can replace the application of diacetate fiber in cigarette filters.

2. In a filter tip containing bulky yarn of the present invention, the bulky yarn is used as the basic unit of the filter unit, and a single bulky yarn is made of core yarn and outer yarn, which has strong adjustability and can adjust the filter unit. The porosity of the bulky yarn can be greatly adjusted, and the adjustment methods are various, such as adjusting the fiber ratio between the high-shrinkage fiber and the low-shrinkage fiber in the raw material of the bulky yarn; adjusting the twist coefficient of the yarn during the production of the bulky yarn; The bulkiness of the body yarn during the wet heat setting treatment in the process of making the yarn. It can be seen that this design has a strong adjustment function in terms of the porosity of the filter unit, so it has a strong adjustment ability in the pressure drop of the filter. The pressure drop will not be too high, which will make it difficult for smokers to accept it due to the effort of suction, which is conducive to gaining the approval of smokers. Therefore, the present invention not only has a strong ability to adjust the pressure drop, but also can take into account both adsorption and suction comfort, which is favorable for being accepted by smokers.

3. In a filter tip containing bulky yarn according to the present invention, a single loop includes a loop side strip and a loop high point and a loop low point connected to both ends thereof, and the loop height and low point are respectively located above and below the core yarn, wherein , the arrangement structure of loop height and low point is various, it can be that at least one of the loop high point and loop low point is in contact with the outer circumference of the core yarn (the first type), or it can be that both loop high point and loop low point are equal Set away from the core yarn, there is a high loop gap between the loop high point and the core yarn, and a low loop gap between the loop low point and the core yarn (the second type), especially the second type, when it is applied With a richer spatial level, it can further extend the length of the path through which the flue gas passes through the filter unit, and improve the adsorption effect on harmful substances in the flue gas. Therefore, the adsorption effect of the present invention is stronger.

4. In a filter tip containing bulky yarns of the present invention, the layout structures of all bulky yarns in the filter unit are various, each with a particular emphasis, such as bulky yarns piled up side by side, such as bulky yarns with yarn rods, winding rods or It exists in the form of filter sheets, so as to adapt to different needs, such as the coordination between various pressure drops, adsorption effects, and support effects, especially when there is a gap between the loops and the insertion of the coils in two adjacent bulky yarns When it is used, it will provide a longer flue gas passage, enhance the adsorption effect, and at the same time, enhance the support effect. Therefore, the present invention has strong adjustability and can take into account multiple performances of the filter tip.

5. In a filter tip containing bulky yarn of the present invention, a plurality of side-entry filaments can also be added in the filter tip, and the layout structures of the side-entry filaments are various. As for the other end of the side-entry wire, it is not limited to be connected to the inner wall of the outer cladding, but the side-entry wire must be in contact with the filter unit, and it is best to be able to interact with each other, such as inside the filter unit or Passing through the filter unit, in this way, it can provide similar longitudinal support to the filter unit and stabilize the filter tip. Second, it can re-divide the existing smoke circulation path in the filter unit to increase the spatial level. Extend the flue gas path. In addition, on the basis of this design, if the material of the side-entry wire can be limited to PLA, it can also exert the heat absorption effect of PLA to reduce the temperature of the flue gas and improve the comfort of smoking. , At the same time, PLA will undergo a morphological change after absorbing heat, which can enhance the connection firmness between the internal structures of the filter unit, or the connection effect between the filter unit and the side-entry wire, thereby improving the firmness of the entire filter. Therefore, the present invention not only has good adsorption and cooling effects, but also has strong overall firmness and stability.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural view of the bulked yarn in Fig. 1 .

Fig. 3 is a schematic structural view of all bulky yarns stacked side by side in the filter unit of the present invention.

Fig. 4 is a schematic view of the structure of all bulky yarns in the filter unit of the present invention when they are intertwined or woven into yarn rods.

Fig. 5 is a schematic diagram of the distribution of subunits in the filter unit in the present invention.

Fig. 6 is a schematic structural view of the rolling rod in the present invention.

Fig. 7 is a schematic diagram of the distribution of filter sheets in the filter unit in the present invention.

Fig. 8 is a schematic diagram of the combination of the side-entry wire and the filter unit in the present invention.

Fig. 9 is a schematic diagram of the connection between the side-entry wire and the outer cladding in the present invention.

In the figure: outer cladding 1, filter unit 2, subunit 21, sub-yarn bar 22, bulky yarn 3, core yarn 31, outer yarn 32, coil 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, middle cloth 51, filter sheet 6, side entry wire 7.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1-Fig. 9, a kind of filter tip containing bulky yarn, comprises outer cladding 1 and filter unit 2 wrapped in it;

The filter unit 2 includes at least two bulky yarns 3. The direction of the filter unit 2 from the beginning to the end is consistent with the direction of the smoke. The outer part of the outer cladding layer 1 is in contact with the inner side wall;

The bulky yarn 3 includes 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, and the core yarn 31 is located in the middle of the bulky yarn 3 where it is located. , the outer yarn 32 is wound outside the core yarn 31 , and the outer yarn 32 is presented as a plurality of coils 33 connected in sequence along the core yarn 31 , and the diameter of a single coil 33 is larger than that of the core yarn 31 .

The coil 33 includes a loop side strip 332 and a loop high point 331 and a loop low point 333 connected to its two ends, the loop high point 331 and the loop low point 333 are respectively located above and below the core yarn 31, and the loop high point 331. The layout structure of circle low point 333 is any one of the following:

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

The loop high point 331 and the loop low point 333 are both set away from the core yarn 31. There is a high loop gap 334 between the loop high point 331 and the core yarn 31, and a low loop gap is sandwiched between the loop low point 333 and the core yarn 31. 335.

In the bulked yarn 3 , there are loop gaps 34 between adjacent loops 33 .

In two adjacent bulky yarns 3, at least one loop gap 34 on one bulky yarn 3 is inserted with a coil 33 on another bulky yarn 3, and the coil inserted in a single loop gap 34 The quantity of 33 is at least one (this is the loop gap 34, the coil 33 is inserted).

In the bulked yarn 3 , the outer yarn 32 is wound around the outside of the core yarn 31 in a helical structure, and the loops in the helical structure refer to coils 33 .

The arrangement structure of all bulky yarns 3 in the filter unit 2 is any of the following:

All bulky yarns 3 are piled up side by side, and the trend of each bulky yarn 3 from the beginning to the end is consistent with the trend of the smoke;

All the bulky yarns 3 are intertwined or woven into a yarn rod 4, and the direction of the yarn rod 4 from the beginning to the end is consistent with the direction of the smoke.

The filter unit 2 includes at least two subunits 21, and the direction of all the subunits 21 from the beginning to the end is consistent with the direction of the smoke; The arrangement structure of the body yarn 3 is any one of the following:

All bulky yarns 3 are piled up side by side, and the trend of each bulky yarn 3 from the beginning to the end is consistent with the trend of the smoke;

All the bulky yarns 3 are intertwined or woven into a sub-yarn bar 22, and the direction of the sub-yarn bar 22 is consistent with the trend of the smoke from the beginning to the end.

The filter unit 2 includes at least one rolling rod 5, the direction of the rolling rod 5 from the beginning to the end is consistent with the direction of the smoke, the rolling rod 5 is wound by an intermediate cloth 51, and the intermediate cloth 51 is made of a plurality of expanded Yarn 3 is woven.

The filter unit 2 includes a plurality of 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 , and the filter sheet 6 is woven from a plurality of bulked yarns 3 .

The filter tip also includes a plurality of side-entry wires 7, and the arrangement structure of the side-entry wires 7 is any one or any combination of the following:

One end of the single side-entry wire 7 is connected to the inner side wall of the outer cladding 1, and the other end of the single side-entry wire 7 is located inside the filter unit 2;

One end of the single side-entry wire 7 is connected to the inner side wall of the outer cladding 1, and the other end of the single side-entry wire 7 passes through the filter unit 2 or after being in contact with the filter unit 2, and then connects to the inner side wall of the outer clad 1. connected;

One end of the single side-entry wire 7 is connected to the inner wall of the outer cladding 1 , and the other end of the single side-entry wire 7 is in contact with the outer periphery of the filter unit 2 .

Principle of the present invention is described as follows:

The bulky yarn in the present invention refers to: first blending two kinds of fibers with different shrinkage into yarn, and then placing the yarn in steam or hot air or boiling water for treatment, at this time, the fiber with high shrinkage will produce larger Shrinkage, located in the center of the yarn (that is, the core yarn 31), and the mixed low-shrinkage fiber (that is, the outer yarn 32), due to the small shrinkage, is squeezed and then forms a circle on the surface of the yarn (that is, the coil 33 ), thus forming a bulky yarn with a fluffy, plump and elastic structure.

The material of the side-entry wire 7 in the present invention is preferably PLA (polylactic acid). In addition, the installation process of the side-entry wire 7 is preferably: first implanted on the unfolded and flat outer cladding layer 1 by electrostatic flocking A plurality of side-entry wires 7, and then the filter unit 2 is placed on the tiled outer wrapping layer 1, and then the outer wrapping layer 1 is rolled up to wrap the filter unit 2 inside the outer wrapping layer 1 to form a filter tip, or wrapping Afterwards, it is cut several times to obtain multiple filters.

The "direction of smoke" in the present invention refers to the overall flow direction of smoke in the smoking product when the smoker uses the smoking product, that is, the overall direction of flowing from the part where the smoke is generated to the end filter.

Example 1:

Referring to Fig. 1 and Fig. 2, a filter tip containing bulky yarn includes an outer cladding 1 and a filter unit 2 wrapped inside it; the filter unit 2 includes at least two bulky yarns 3, and the filter unit 2 is from head to tail The trend of the flue gas is consistent with the trend of the flue gas, the adjacent bulky yarns 3 are in contact with each other, and the outer part of the bulky yarn 3 constituting the outer periphery of the filter unit 2 is in contact with the inner sidewall of the outer cladding 1; the bulky yarn 3 includes 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 bulky yarn 3 where it is located, and the outer yarn 32 is wound Outside the core yarn 31 , 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 larger than that of the core yarn 31 .

Example 2:

Basic content is the same as embodiment 1, the difference is:

Referring to Fig. 1 and Fig. 2, each coil 33 includes a loop side strip 332 and a loop high point 331 and a loop low point 333 connected to its two ends, and the loop high point 331 and loop low point 333 are respectively located above the core yarn 31 , below, the layout structure of the circle high point 331 and the circle low point 333 is any of the following:

One or both of the loop high point 331 and the loop low point 333 are in contact with the outer circumference of the core yarn 31;

The ring high point 331 and the ring low point 333 are all set away from the core yarn 31. At this time, the ring high point 331 and the ring low point 333 are not in contact with the outer circumference of the core yarn 31, and the gap between the ring high point 331 and the core yarn 31 There is a high loop gap 334, and a low loop gap 335 is sandwiched between the loop low point 333 and the core yarn 31. When applied, the high loop gap 334 and the low loop gap 335 can not only increase the bulkiness, but also provide the supporting force for expansion , and the high ring gap 334 and the low ring gap 335 can enrich the internal space of the filter unit 2 and prolong the circulation path of the flue gas.

Example 3:

Basic content is the same as embodiment 1, the difference is:

Referring to Fig. 1 and Fig. 2, among two adjacent bulky yarns 3, at least one loop gap 34 on one bulky yarn 3 is inserted with a coil 33 on another bulky yarn 3, and a single loop The number of coils 33 inserted in the coil gap 34 is at least one (that is, the coil gap 34 and the coil 33 are inserted in pairs).

In actual application, it is not limited that the coil 33 is inserted into each coil gap 34 , nor is the insertion depth of the coil 33 in the coil gap 34 limited.

Example 4:

Basic content is the same as embodiment 1, the difference is:

Referring to Fig. 3, the arrangement structure of all bulky yarns 3 in the filter unit 2 is as follows: all bulky yarns 3 are piled up side by side (there are three bulky yarns 3 in total), and the direction of each bulky yarn 3 from the beginning to the end is consistent with The direction of the smoke is the same.

Example 5:

Basic content is the same as embodiment 1, the difference is:

Referring to Fig. 4, the arrangement structure of all bulky yarns 3 in the filter unit 2 is as follows: all bulky yarns 3 are intertwined or woven into a yarn rod 4 (two bulky yarns 3 are mutually twisted into a yarn rod 4 ), the direction of the yarn rod 4 from the beginning to the end is consistent with the direction of the flue gas.

Embodiment 6:

Basic content is the same as embodiment 1, the difference is:

Referring to FIG. 5 , which is a schematic cross-sectional view of the filter unit 2 , one filter unit 2 includes three subunits 21 , and the direction of each subunit 21 from the beginning to the end is consistent with the direction of the smoke. Among them, the structures of the three sub-units 21 are different, respectively:

Two bulky yarns 3 are piled up side by side, and the direction of each bulky yarn 3 from the beginning to the end is consistent with the direction of the smoke;

Two bulky yarns 3 are twisted mutually to form a sub-yarn rod 22, and the direction of the sub-yarn rod 22 from the beginning to the end is consistent with the direction of the smoke;

Three bulky yarns 3 are twisted mutually to form a sub-yarn bar 22, and the trend of the sub-yarn bar 22 from the beginning to the end is consistent with the trend of the smoke.

In addition, for the structure of bulky yarns 3 stacked side by side, a comparative experiment was carried out as follows, wherein, this example is a structure of bulky yarns 3 stacked side by side, the difference is only in the difference in the number of bulky yarns 3, by this example and Comparing the existing cellulose acetate filter rods (the core part of the filter tip), it can be seen that this design can match the application effect of the existing cellulose acetate filter rods in terms of suction resistance (reflecting pressure drop) and filtration efficiency (reflecting adsorption capacity) .

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Embodiment 7:

Basic content is the same as embodiment 1, the difference is:

Referring to Figure 6, the filter unit 2 includes at least one rolling rod 5 (Figure 6 shows a schematic cross-sectional view of the rolling rod 5), the direction of the rolling rod 5 from the beginning to the end is consistent with the direction of the smoke, the rolling rod 5 It is formed by winding an intermediate cloth 51 , and the intermediate cloth 51 is a planar structure woven by a plurality of bulked yarns 3 .

Embodiment 8:

Basic content is the same as embodiment 1, the difference is:

Referring to Fig. 7, this figure is the cross-sectional schematic view of filter unit 2, as seen among the figure, 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 filter unit 2, the filter Sheets 6 are woven from multiple bulked yarns 3 .

Embodiment 9:

Basic content is the same as embodiment 1, the difference is:

Referring to Fig. 8, the filter tip also includes a plurality of side-entry wires 7, and the arrangement structure of the side-entry wires 7 is any one or any combination of the following:

One end of the single side-entry wire 7 is connected to the inner side wall of the outer cladding 1, and the other end of the single side-entry wire 7 is located inside the filter unit 2;

One end of the single side-entry wire 7 is connected to the inner side wall of the outer cladding 1, and the other end of the single side-entry wire 7 passes through the filter unit 2 or after being in contact with the filter unit 2, and then connects to the inner side wall of the outer clad 1. connected;

One end of the single side-entry wire 7 is connected to the inner wall of the outer cladding 1 , and the other end of the single side-entry wire 7 is in contact with the outer periphery of the filter unit 2 .

Referring to Fig. 9, the method of setting the side-entry wire 7 is preferably as follows: first, the side-entry wire 7 is planted on the flat outer cladding layer 1 by means of electrostatic flocking (the side-entry wire 7 can also be bonded, bonded on the tiled outer cladding 1), and then wrap the outer cladding 1 on the filter unit 2, so that the side-entry wire 7 is in contact with or connected to the filter unit 2. At the same time, the length of the outer cladding 1 and the filter unit 2 It is not limited, it can be exactly one filter tip after wrapping, and the wrapped product can also be cut into multiple sections, and each section can be used as a filter tip.

The above descriptions are only preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, but all equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included within the scope of protection described in the claims.

Claims (10)

1. A filter tip containing bulky yarn, comprising an outer cladding (1) and a filter unit (2) wrapped inside it, characterized in that: The filter unit (2) includes at least two bulky yarns (3), the direction of the filter unit (2) from the beginning to the end is consistent with the direction of the smoke, and adjacent bulky yarns (3) are in contact with each other to form a filter unit (2) The outer side of the bulked yarn (3) on the outer side is in contact with the inner side wall of the outer cladding (1); The bulked yarn (3) includes 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, and the core yarn (31) is located in the middle of the bulky yarn (3) where it is located, the outer yarn (32) is wound outside the core yarn (31), and the outer yarn (32) presents a plurality of sequentially connected along the core yarn (31) Coils (33), the diameter of a single coil (33) is larger than the diameter of the core yarn (31). 2. A filter tip containing bulky yarn according to claim 1, characterized in that: said coil (33) comprises loop side strips (332) and loop height points (331) connected to its two ends, loop The low point (333), the loop high point (331), and the loop low point (333) are respectively located above and below the core yarn (31), and the arrangement structure of the loop high point (331) and the loop low point (333) is Any of the following: At least one of the loop high point (331) and the loop low point (333) is in contact with the outer circumference of the core yarn (31); The loop high point (331) and the loop low point (333) are all set away from the core yarn (31), and there is a high loop gap (334) between the loop high point (331) and the core yarn (31), and the loop low point ( 333) and the core yarn (31) are sandwiched into a low loop gap (335). 3. The filter tip containing bulky yarn according to claim 1 or 2, characterized in that: in the bulky yarn (3), there are loop gaps (34) between adjacent coils (33) . 4. A filter tip containing bulky yarn according to claim 3, characterized in that: among two adjacent bulky yarns (3), there is at least one loop gap on one bulky yarn (3) A loop (33) on another bulked yarn (3) is inserted into (34), and the number of loops (33) inserted in a single loop gap (34) is at least one. 5. A filter tip containing bulky yarn according to claim 1 or 2, characterized in that: in the bulky yarn (3), the outer yarn (32) is spirally wound around the core yarn ( 31) outside, the loop in the helical structure refers to the coil (33). 6. A filter tip containing bulky yarn according to claim 1 or 2, characterized in that: the arrangement structure of all bulky yarns (3) in the filter unit (2) is any of the following: All the bulky yarns (3) are piled up side by side, and the direction of each bulky yarn (3) from the beginning to the end is consistent with the direction of the smoke; All the bulky yarns (3) are intertwined or woven into a yarn rod (4), and the direction of the yarn rod (4) from the beginning to the end is consistent with the direction of the smoke. 7. A filter tip containing bulky yarn according to claim 1 or 2, characterized in that: the filter unit (2) includes at least two subunits (21), and all subunits (21) are connected from head to tail The direction is consistent with the direction of the smoke; the subunit (21) includes at least two bulky yarns (3), and the arrangement structure of all bulky yarns (3) in a single subunit (21) is any of the following: All the bulky yarns (3) are piled up side by side, and the direction of each bulky yarn (3) from the beginning to the end is consistent with the direction of the smoke; All the bulky yarns (3) are intertwined or woven into a sub-yarn rod (22), and the direction of the sub-yarn rod (22) from the beginning to the end is consistent with the direction of the smoke. 8. A filter tip containing bulked yarn according to claim 1 or 2, characterized in that: the filter unit (2) includes at least one rolling rod (5), and the rolling rod (5) is The direction of the smoke is consistent with the direction of the flue gas, and the rolling rod (5) is wound by an intermediate cloth (51), and the intermediate cloth (51) is spun by a plurality of bulked yarns (3). 9. A filter tip containing bulky yarn according to claim 1 or 2, characterized in that: the filter unit (2) comprises a plurality of folded filter sheets (6), the length of a single filter sheet (6) Less than or equal to the length of the filter unit (2), the filter sheet (6) is woven from a plurality of bulked yarns (3). 10. A filter tip containing bulky yarn according to claim 1 or 2, characterized in that: the filter tip also includes a plurality of side-entry filaments (7), and the arrangement structure of the side-entry filaments (7) is as follows Any one or any combination: One end of the single side-entry wire (7) is connected to the inner wall of the outer cladding (1), and the other end of the single side-entry wire (7) is located inside the filter unit (2); One end of the single side-entry wire (7) is connected to the inner wall of the outer cladding (1), and the other end of the single side-entry wire (7) passes through the filter unit (2) or is in contact with the filter unit (2) After that, it is connected with the inner wall of the outer cladding (1); One end of the single side-entry wire (7) is connected to the inner wall of the outer cladding (1), and the other end of the single side-entry wire (7) is in contact with the outer circumference of the filter unit (2).

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