CN113142640A

CN113142640A - Cigarette, filter stick and flow regulating unit

Info

Publication number: CN113142640A
Application number: CN202110504476.9A
Authority: CN
Inventors: 肖松; 冯伟博; 郁通; 何照林; 高旭; 孙文轩
Original assignee: Yunnan Xinyun Technology Development Co ltd
Current assignee: Yunnan Xinyun Technology Development Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-07-23

Abstract

The application discloses cigarette, filter rod and accent and flow the unit, wherein it includes a throttling element to transfer the flow the unit, wherein throttling element form at least a speed governing passageway and with a negative pressure space of speed governing passageway intercommunication, the speed governing passageway is set up and runs through throttling element's both ends, with throttling element form respectively at both ends with an in-connection opening and an outer intercommunication mouth that the intercommunication passageway communicates.

Description

Cigarette, filter stick and flow regulating unit

Technical Field

The invention relates to the field of cigarette components, in particular to a cigarette, a filter stick and a flow regulating unit.

Background

The common filter stick is only composed of an acetate fiber filter core and outer-layer wrapped forming paper, the process of smoke passing through the filter stick is smooth, but the filtering effect is very limited, and the filter tip is burnt yellow after being sucked, so that the attractiveness is seriously influenced. In addition, harmful residues in the smoke have great harm to human bodies. At present, the harm of smoking to human bodies is reduced only by additionally arranging a common filter stick on the traditional cigarette, but with the development and progress of the society, people pursue high-quality life more and more, people pay more attention to the appearance of the cigarette, and the phenomenon that the filter tip turns yellow after the cigarette is sucked gradually becomes one of the focuses of people.

CN103263081B discloses a multi-element composite flow guide filter stick, the tow filter core of which is formed by combining four filter cores: the second section of filter element is a coaxial filter element section with an inner core suction resistance larger than that of the outer ring, the third section of filter element and the fourth section of filter element are filter element sections with guide holes, the guide holes of the third section of filter element and the fourth section of filter element are partially or completely aligned, smoke flows out of the guide holes without passing through tows by utilizing the structural design, and the color of the filter rod is basically unchanged after the filter rod is visually displayed and sucked. This way, although it changes the path of the fumes, does not substantially reduce the harmful substances drawn by the user.

CN111480883A discloses a cigarette multi-component composite filter stick without color change after smoking, wherein a filter element of the filter stick is composed of a first adsorption section, a common filter stick section and a pressure tightening groove section which are sequentially butted, and the first adsorption section is connected with a second adsorption section at the end of a tobacco shred. After tar is reduced through the selectivity of the adsorption section, the tar directly enters the oral cavity of a consumer through the groove of the compressed groove section, so that the contamination to the filter stick is reduced, and the sucked end face is not discolored. Because the substances with the adsorption function have certain weight, the composite filter stick formed in such a way inevitably increases the overall weight, and brings bad experience to users. In addition, since this method requires the addition of a first adsorption stage and a second adsorption stage in the path through which the aerosol flows, the filter rod is attached to

After the existing cigarette is smoked, the main reason that the filter stick of the existing cigarette turns yellow is that aerosol in mainstream smoke is intercepted by the filter stick and continuously gathered to form the cigarette, and the aerosol contains particulate matters and gas-phase matters. The technology for solving the yellowing of the filter stick in the patent mainly comprises the steps of carrying out smoke turbulence or adsorption through the combination of different filter stick sections, and finally directly entering an oral cavity through gaps such as flow guide holes, grooves and the like on the end face of the filter stick without being stained with the end face of the filter stick, so that the effect that the end face is not discolored after being sucked is achieved. Therefore, the filter stick is complex in structural design and finally enters the cavity through the pores, and no substantial core element which enables the end face of the filter stick not to change color or the color of the cross section of the filter stick to be light after suction exists in the filter stick structure.

Disclosure of Invention

An advantage of the present invention is to provide a cigarette, a filter rod and a flow regulating unit, wherein the flow regulating member can be applied to various kinds of cigarettes, such as a common cigarette or a heat non-combustible cigarette.

Another advantage of the present invention is to provide a cigarette, a filter rod and a flow regulating unit, wherein the throttling element has a simple structure and can be combined with a conventional acetate filter element to form a filter rod segment, and therefore, the throttling element has high applicability.

Another advantage of the present invention is to provide a cigarette, a filter stick and a flow regulating unit, wherein the throttling element can block harmful substances in smoke on the premise of ensuring suction resistance, so that the smoke sucked by a user is healthier.

Another advantage of the present invention is to provide a cigarette, a filter stick and a flow regulating unit, wherein the throttling element is hidden in the cigarette and can throttle particulate matters in smoke when a user sucks the smoke, so as to ensure that the appearance of the cigarette does not turn yellow.

Another advantage of the present invention is to provide a cigarette, a filter stick and a flow regulating unit, wherein the throttling element can effectively reduce the temperature of aerosol when being used for the cigarette, thereby preventing a user from being burned by the aerosol with too high temperature.

Another advantage of the present invention is to provide a cigarette, a filter rod and a flow regulating unit, wherein the filter rod segment formed by the throttling element has a simple structure and a simple manufacturing process, and is suitable for mass production.

To achieve at least one of the above advantages, an advantage of the present invention is to provide a flow regulating unit for cigarettes, wherein the flow regulating unit includes a throttling element, wherein the throttling element forms at least one flow regulating passage and a negative pressure space communicated with the flow regulating passage, and the flow regulating passage is disposed to penetrate both ends of the throttling element to form an inner communication port and an outer communication port communicated with the communication passage at both ends of the throttling element, respectively.

According to an embodiment of the present invention, the throttling element is formed with a negative pressure groove communicating with the internal communication port at an end portion of the throttling element to define the negative pressure space.

According to an embodiment of the present invention, the throttling element includes an inner main body portion forming the inner communication port, an outer main body portion forming the outer communication port, and a supporting portion connecting the inner main body portion and the outer main body portion, the inner main body portion and the outer main body portion respectively form an inner channel and an outer channel to define the flow regulating communication together, and the throttling element forms at least one negative pressure space between the inner communication port and the outer communication port.

According to an embodiment of the present invention, the throttling element forms at least two negative pressure spaces at intervals between the inner communication port and the outer communication port.

According to an embodiment of the present invention, the supporting portion includes a supporting main body portion and at least one partition portion, two ends of the supporting main body portion are respectively connected to the inner main body portion and the outer main body portion and extend in an axial direction, and the partition portion extends in a radial direction from a periphery of the main body portion to respectively form two negative pressure spaces spaced from each other with the inner main body portion and the outer main body portion.

According to an embodiment of the invention, the directions in which the inner channel and the outer channel extend are parallel and not coaxial.

According to an embodiment of the present invention, the flow regulating unit further comprises a filter assembly, wherein the filter assembly is configured to abut against an end of the throttling element.

According to an embodiment of the invention, the filter assembly comprises a hollow tube section and a filter element, one end of the hollow tube section is butted against one end of the filter element, wherein the other end of the filter element is butted against an end of the throttling element forming the inner through opening.

To achieve at least one of the above advantages, the present invention provides a filter rod comprising:

a filter stick main body; and

the flow regulating unit for cigarettes as described above, wherein the end of the throttling element of the flow regulating unit on which the external communication port is formed is butted against the plug body.

To achieve at least one of the above advantages, the present invention provides a cigarette comprising:

a cigarette body;

a filter plug as described above, wherein said filter plug is docked to said cigarette body.

Drawings

Figure 1 shows a cross-sectional view of the cigarette according to one embodiment of the invention.

Figure 2 shows a cross-sectional view of the cigarette according to a second embodiment of the invention.

FIG. 3 illustrates a perspective view of a first embodiment of a throttling element of the present invention.

FIG. 4 illustrates a side view of a first embodiment of a throttling element of the present invention.

FIG. 5 illustrates a cross-sectional view B-B of a first embodiment of a throttling element of the present invention.

FIG. 6 illustrates a front view of a first embodiment of a throttling element of the present invention.

FIG. 7 illustrates a cross-sectional view A-A of a first embodiment of a throttling element of the present invention.

FIG. 8 shows a schematic view of a second embodiment of a throttling element according to the present invention.

FIG. 9 shows a schematic view of a third embodiment of a throttling element according to the present invention.

FIG. 10 shows a schematic view of an angle of a third embodiment of a throttling element of the present invention.

FIG. 11 is a schematic view of a fourth embodiment of a throttling element of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 1 to 11, a cigarette according to a preferred embodiment of the present invention, which includes a cigarette body 100 and a filter plug 300, wherein the filter plug 300 is mounted to an end of the cigarette body 100, will be described in detail below. It is worth mentioning that the cigarette body 100 comprises a smoking agent. The cigarette body 100 may further include a cooling section when the cigarette is implemented as a heat non-combustible cigarette.

As the smoking agent is heated to form an aerosol, i.e., smoke, the user continues to draw on the filter plug 300, thereby directing smoke, i.e., aerosol, from the interior of the cigarette body 100 toward the other end of the filter plug 300.

Specifically, the filter plug 300 includes a flow regulating unit 31 and a plug body 32. The flow regulating unit 31 is provided between the cigarette body 100 and the plug body 32. The flow regulating unit 31, the filter stick body 32 and the cigarette body 100 are cylindrical as a whole.

The flow regulating unit 31 forms at least one flow regulating channel 3101. The flow regulating unit 31 is capable of reducing the pressure of the aerosol flowing from the cigarette body 100 to the plug 300 to guide the aerosol to flow from the flow regulating passage 3101 to the plug body 32 in an accelerated manner to be adjacent to the cigarette body 100.

In this way, the cigarette body 100 is heated or ignited to form aerosol, and when a user draws on the end of the filter body 32 far from the cigarette body 100, the aerosol flows through the flow regulating unit 31 due to the change of air pressure, so that the flow path of the aerosol is disturbed, a part of the aerosol containing particulate matters and gaseous matters is deposited on the flow regulating unit 31, and a part of the particulate matters and gaseous matters rapidly impact on the filter body 32 blocking the flow regulating passage 3101 through the flow regulating passage 3101. As a result, most of the particulate matter and the gaseous matter are trapped, so that when a user sucks the cigarette, the particulate matter and the gaseous matter are not accumulated on the end of the filter plug body 32 away from the cigarette body 100, thereby effectively preventing the cigarette from turning yellow in appearance.

In particular, the flow regulating unit 31 comprises a throttling element 311, wherein the throttling element 311 forms the flow regulating passage 3101. The flow regulating passage 3101 is disposed through both ends of the throttling element 311 to form an inner communication port 31101 close to the cigarette body 100 and an outer communication port 31102 far from the cigarette body 100 at both ends of the throttling element 311, respectively. One end of the filter body 32 close to the cigarette body 100 is butted against one end of the throttle element 311 where the outer communication port 31102 is formed, and the cigarette body 100 is butted against the other end of the throttle element 311 where the inner communication port 31101 is formed.

Preferably, the throttling element 311 forms a negative pressure space 31103. The negative pressure space 31103 is provided in communication with the flow control passage 3101. Because the negative pressure space 31103 is formed between the throttling element 311 and the cigarette main body 100, when the aerosol formed by the cigarette main body 100 flows towards the filter rod main body 32, the aerosol can be gathered and cooled in the negative pressure space 31103, and then a part of gas phase substances and particle phase substances are partially collected in the negative pressure space 31103, so that the throttling element 311 can play a role in cooling and filtering the aerosol, and meanwhile, the excessive gas phase substances and particle phase substances can be prevented from gathering at one end, far away from the cigarette main body 100, of the subsequent filter rod main body 32, and the end part of the filter rod main body 32 is prevented from yellowing.

Referring to fig. 2 to 6, in one embodiment, the throttling element 311 is formed with a negative pressure groove communicating with the inner communication port 31101 at an end portion where the inner communication port 31101 is formed, to define a negative pressure space 31103. Preferably, the negative pressure groove extends along the axial direction of the throttling element 311, and the axial direction of the negative pressure groove is parallel to and not coaxial with the axial direction of the flow regulating passage 3101, so that the path of the aerosol can be effectively extended, and the aerosol can be filtered and cooled more effectively. More preferably, the throttling element 311 forms another negative pressure groove communicating with the external communication port 31102 at an end portion where the external communication port 31102 is formed, to define another negative pressure space 31103.

Preferably, a plurality of the flow regulating passages 3101 are formed on the throttling element 311.

Preferably, the flow regulating channel 3101 has a diameter of 0.1-1.0 mm; more preferably, the flow regulating channel 3101 has a diameter of 0.3-0.5 mm. Experiments prove that when the diameter of the throttling element 311 is less than 0.3mm, when the throttling element 311 is subjected to injection molding, an insert needle in a molding die is easy to break, and the throttling element has the conditions of blind holes, burrs, inclined holes and the like; when the diameters of the inner channel and the outer channel in the flow regulating passage 3101 are larger than 0.5mm, the condensation and filtration effects are obviously reduced under the condition of the same quantity and structure, and the tar point deposited on the direct contact surface of the aerosol condensed and filtered by the throttling element 311 on the filter stick main body 32 is reflected to be changed from darker color to lighter color. Referring to fig. 8 to 11, in a modified embodiment, at least one negative pressure space 31103 is defined between the inner communication port 31101 and the outer communication port 31102 formed on the throttling element 311.

Specifically, the throttling element 311 includes an inner body portion 3111 defining the inner communication port 31101, an outer body portion 3112 defining the outer communication port 31102, and a support portion 3113 connecting the inner body portion 3111 and the outer body portion 3112.

Referring to fig. 8, 9 and 11, the inner body portion 3111 and the outer body portion 3112 form an inner channel 311101 and an outer channel 311201, respectively, to collectively define the flow regulating passage 3101. The inner channel 311101 and the outer channel 311201 extend in parallel and coaxially with each other. Preferably, the extension directions of the inner channel 311101 and the outer channel 311201 are parallel to each other but not coaxial, so as to prolong the path of the aerosol flowing between the throttling element 311, and further achieve better filtering and cooling effects.

Preferably, the throttling element 311 forms at least two negative pressure spaces 31103 between the inner communication port 31101 and the outer communication port 31102 at intervals, so that the path through which the aerosol flows can be extended more effectively, and the filtering effect and the temperature reduction effect can be improved at the same time.

Specifically, in this embodiment, the supporting portion 3113 includes a supporting body portion 31131 and at least one partition portion 31132. Both ends of the support body portion 31131 are connected to the inner body portion 3111 and the outer body portion 3112, respectively, and extend in an axial direction, and the partition portion 31132 extends in a radial direction from the circumference of the support body portion 31131 to form two negative pressure spaces 31103 spaced apart from each other between the inner body portion 3111 and the outer body portion 3112, respectively. At the same time, at least one communication passage 3113201 is formed in the partition 31132 to allow the two spaced negative pressure spaces 31103 to communicate with each other.

When the support portion 3113 includes a plurality of the partition portions 31132, one negative pressure space 31103 is also formed between two adjacent partition portions 31132.

In order to save the process, the communication passage 3113201 on the partition 31132, the inner passage 311101 on the inner body portion 3111, and the outer passage 311201 on the outer body portion 3112 are coaxially provided. In other embodiments, the communication channel 3113201 on the partition 31132 is disposed parallel to but not coaxial with the inner channel 311101 on the inner body 3111 and/or the outer channel 311201 on the outer body 3112, which can better extend the path of the aerosol and provide better filtering and cooling effects.

Referring to fig. 1 and 2, the flow regulating unit 31 also preferably includes a filter assembly 312. The filter assembly 312 is disposed between the cigarette body 100 and the restriction element 311 to pre-treat the aerosol formed by the cigarette body 100.

Specifically, in one embodiment, the filter assembly 312 is implemented as a section of acetate fiber made of acetate fiber material. In a preferred embodiment, the filter assembly 312 includes a hollow tube segment 3121 and a filter element 3122. The hollow tube segment 3121 is respectively abutted at both ends thereof to one end of the cigarette body 100 and the filter element 3122, wherein the other end of the filter element 3122 is abutted to the end of the throttling element 311 forming the inner communication port 31101.

It is worth mentioning that when the hollow tube segment 3121 is abutted between the filter element 3122 and the cigarette main body 100, a negative pressure cavity 312101 can be formed in the hollow tube segment 3121, so that aerosol changes a flow path of aerosol when flowing to the hollow tube segment 3121, thereby increasing a contact area between aerosol and the filter element 3122 to enhance a filtering effect of the filter element 3122.

Preferably, the filter element 3122 may be implemented as a paper rod, or may be implemented as an acetate material.

Also preferably, the filter plug body 32 is embodied as being made of an acetate material.

It is worth mentioning that at least one communication hole 312102 is provided on the hollow tube segment 3121, wherein the communication hole 312102 is provided to communicate with the negative pressure chamber 312101, that is, the negative pressure chamber 312101 communicates with the outside through the communication hole 312102. In this way, the temperature of the formed aerosol can be reduced more favorably.

According to one aspect of the present invention, there is also provided a method of making a throttling element, wherein the method of making the throttling element comprises the steps of:

mixing 70-95 parts by weight of polylactic acid and 5-30 parts by weight of elastomer at the temperature of 170-220 ℃;

granulating the mixed mixture at a temperature of 170-220 ℃ to form granules;

the formed pellets are melted and molded through a corresponding mold to form the throttling element.

It is worth mentioning that the mixing is performed at 500 to 800rpm for 5 to 30min while mixing the 70 to 95 parts by weight of the polylactic acid and the 5 to 30 parts by weight of the elastomer.

The polylactic acid (PLA) is a thermoplastic polyester plastic which is commercially produced, has renewable raw material sources, good biocompatibility and biodegradability, can be gradually degraded in human bodies and natural environments, and is finally decomposed into carbon dioxide and water. Therefore, the polylactic acid has good industrial prospect, can replace the traditional petroleum-based polymer material, and can be widely applied to the fields of medical treatment, pharmacy, agriculture, packaging and the like. However, the polylactic acid has the defects of high hardness, strong brittleness, poor impact resistance and low elongation at break, so that the polylactic acid is limited to be widely applied to the field of general plastics.

The elastomer is any one or the combination of at least two of thermoplastic polyurethane, polycaprolactone, polybutylene succinate, ethylene-vinyl acetate copolymer or ethylene-glycidyl methacrylate.

Example one

70 parts by weight of polylactic acid and 30 parts by weight of thermoplastic polyurethane were added to a high-speed mixer and mixed at 800rpm for 30 minutes to obtain a mixture. And (3) melting and blending the mixture by using an internal mixer, internally mixing for 30min at the temperature of 220 ℃ and the rotating speed of 60rpm, and cutting the blend into particles while the blend is hot. And adding the blend particles into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element.

The throttling element formed finally comprises 1 partition part and an annular supporting part with an outer ring, and the throttling element is 5mm in length and 24.0mm in circumference. The thickness of the throttling element is 3mm, and 8 flow regulating channels with the diameter of 0.3mm are arranged on the throttling element.

Example two

95 parts by weight of polylactic acid and 5 parts by weight of polycaprolactone were added to a high-speed mixer and mixed at 800rpm for 5min to obtain a mixture. And (3) melting and blending the mixture by using an internal mixer, internally mixing for 10min at the temperature of 180 ℃ and the rotating speed of 30rpm, and shearing the blend into particles while the blend is hot. And adding the blend particles into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element.

The throttling element comprises 1 supporting main body part consisting of the separating part and the cross supporting part, the length of the throttling element is 10mm, and the circumference of the throttling element is 16.5 mm. The thickness of the throttling element is 1.5mm, and the throttling element has 4 flow regulating channels with the diameter of 0.5 mm. The wall thickness of the supporting main body part is 1.0 mm.

EXAMPLE III

85 parts by weight of polylactic acid and 15 parts by weight of polybutylene succinate were added to a high-speed mixer and mixed at 800rpm for 15min to obtain a mixture. And (3) melting and blending the mixture by using an internal mixer, internally mixing for 15min at the temperature of 200 ℃ and the rotating speed of 45rpm, and cutting the blend into particles while the blend is hot. And adding the blend particles into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element.

The throttling element comprises 3 supporting main body parts consisting of the separating parts and the cross supporting parts, the length of the throttling element is 20mm, and the circumference of the throttling element is 19.5 mm. The thickness of the throttling element is 1.5mm, and the throttling element has 4 flow regulating channels with the diameter of 0.5 mm.

Example four

80 parts by weight of polylactic acid and 20 parts by weight of ethylene-vinyl acetate were added to a high-speed mixer and mixed at 800rpm for 20min to obtain a mixture. And (3) melting and blending the mixture by using an internal mixer, internally mixing for 20min at the temperature of 210 ℃ and the rotating speed of 45rpm, and cutting the blend into particles while the blend is hot. And adding the blend particles into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element.

The throttling element is 5mm in length and 24.0mm in circumference. The thickness of the throttling element is 3mm, and 27 flow regulating channels with the diameter of 0.1mm are arranged on the throttling element.

EXAMPLE five

85 parts by weight of polylactic acid and 25 parts by weight of ethylene-glycidyl methacrylate were added to a high-speed mixer and mixed at 800rpm for 25min to obtain a mixture. And (3) melting and blending the mixture by using an internal mixer, internally mixing for 25min at the temperature of 210 ℃ and the rotating speed of 50rpm, and cutting the blend into particles while the blend is hot. And adding the blend particles into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element.

The throttling element is 5mm in length and 24.0mm in circumference. The thickness of the throttling element is 3mm, and the throttling element is provided with 1 flow regulating channel with the diameter of 1.0 mm.

Comparative example 1

And (3) directly adding polylactic acid into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element with the structure consistent with that of the embodiment.

Comparative example 2

And (3) directly adding polylactic acid into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element with the same structure as the fourth embodiment.

Comparative example three

And (3) directly adding polylactic acid into a micro injection molding machine, heating to a molten state, injecting into a mold, pressurizing, cooling and molding to obtain the throttling element with the structure consistent with that of the five embodiments.

Comparative experiment

1. Experiment on computer

The throttling elements of example one, example four, example five, comparative example one, comparative example two and comparative example three were prepared according to a method of preparing a throttling element of the present invention.

On a ternary filter stick compounding machine, two sections of acetate fiber filter sticks with the lengths of 20mm are compounded with the throttling element, the throttling element is positioned between the two sections of acetate fiber filter sticks, and the three sections of acetate fiber filter sticks are wrapped by forming paper to prepare the 100mm ternary compound filter stick. The results are shown in Table 1:

TABLE 1 evaluation chart for throttle element in-machine experiment

Sample numbering	Stability of	Maximum vehicle speed
			Example one	Stable operation	98m/min
Comparative example 1	Has poor stability and is easy to break	10m/min
			Example four	Stable operation	80m/min
Comparative example 2	Has poor stability and is easy to break	8m/min
			EXAMPLE five	Stable operation	82m/min
Comparative example three	Has poor stability and is easy to break	8m/min

It can be seen from table 1 that, under the same structural condition, the throttling element prepared from the polylactic acid/elastomer blend has good toughness and is stable on the machine, and the throttling element prepared from the polylactic acid has poor stability on the machine and is easy to break. In addition, the maximum speed of the throttling element prepared by the embodiment can reach more than 80m/min, and the requirement of industrial preparation of the filter stick is basically met.

2. Color difference analysis

A cigarette with a certain specification in China is selected as a blank sample, the filter structure is a unitary common acetate fiber filter, and the length of the filter is 25 mm. The 100mm ternary composite filter rods prepared in the first embodiment, the second embodiment and the fifth embodiment and the first comparative embodiment, the second comparative embodiment and the third comparative embodiment are cut into 4-section 25mm filter rod section units (namely 10mm acetate fiber sections, 5mm throttling elements and 10mm acetate fiber section ternary composite filter rod units), and the acetate fiber filter sections in the blank tobacco samples are replaced to prepare the tobacco samples.

The blank sample and the tobacco samples prepared in example one, example four and example five and the tobacco samples prepared in comparative example one, example two and example three were separately smoked on a smoking machine under standard smoking conditions (35 ml of primary smoking capacity, 2s of smoking time, 58s of smoking interval), and the central positions of the lip ends of the filters before and after smoking were subjected to color difference analysis using a color difference meter, and the results are shown in table 1:

TABLE 1 color difference value of central position of filter tip end face before and after smoking

Sample numbering	Color of appearance after smoking	Delta E before and after aspiration
			Blank tobacco sample	Burnt yellow	27.35
Example one	Light yellow	5.46
			Comparative example 1	Yellow colour	9.37
Example four	Light yellow	4.85
			Comparative example 2	Yellow colour	8.86
EXAMPLE five	Light yellow	6.54
			Comparative example three	Yellow colour	10.29

As can be seen from table 2: the delta E value before and after the suction of the common acetate fiber filter stick is 27.35, and the appearance after the suction is observed to be scorch. The delta E values before and after suction of the ternary composite filter rods prepared in the first embodiment, the fourth embodiment and the fifth embodiment are 5.46, 4.84 and 6.54 respectively, and the appearance observation colors are basically similar and are yellowish. The delta E values before and after suction of the ternary composite filter sticks prepared in the first comparative example, the second comparative example and the third comparative example are 9.37, 8.86 and 10.29 respectively, and the appearance observation colors are basically similar and are yellow. Under the condition of the same structure, the color difference of the cross section colors of the filter stick before and after the throttling element prepared from the polylactic acid/elastomer is sucked is smaller than that of the polylactic acid throttling element, and the cross section color of the filter stick after the suction is lighter than that of the polylactic acid throttling element.

Compared with a cigarette adopting a common acetate fiber filter stick, the ternary composite filter stick prepared by the throttling element can effectively perform rapid condensation, aggregation and settlement on aerosol substances, reduce the transfer of the tar substances in mainstream smoke to the lip end of the filter tip, lighten the color of the end face of the filter tip after smoking, and further improve the aesthetic feeling of the appearance of the filter tip after smoking.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A flow regulating unit for cigarettes, comprising a throttling element, wherein the throttling element forms at least one flow regulating passage and a negative pressure space communicated with the flow regulating passage, and the flow regulating passage is arranged to penetrate through both ends of the throttling element so as to form an inner communicating port and an outer communicating port communicated with the communicating passage at both ends of the throttling element respectively.

2. The flow regulating unit for cigarettes according to claim 1, wherein said throttling element forms a negative pressure groove communicating with said inner communicating port at an end of said throttling element to define said negative pressure space.

3. The flow regulating unit for cigarettes according to claim 1, wherein said throttling element comprises an inner body portion forming said inner communication port, an outer body portion forming said outer communication port, and a support portion connecting said inner body portion and said outer body portion, said inner body portion and said outer body portion respectively forming an inner passage and an outer passage to collectively define said flow regulating communication, said throttling element defining at least one of said negative pressure spaces between said inner communication port and said outer communication port.

4. The flow regulating unit for cigarettes according to claim 3, wherein the throttling element forms at least two negative pressure spaces at intervals between the inner communication port and the outer communication port.

5. The flow regulating unit for cigarettes according to claim 4, wherein the supporting portion includes a supporting main body portion and at least one partition portion, both ends of the supporting main body portion are connected to the inner main body portion and the outer main body portion, respectively, and extend in the axial direction, and further, the partition portion extends in the radial direction from the periphery of the main body portion to form two negative pressure spaces spaced apart from each other with the inner main body portion and the outer main body portion, respectively.

6. The flow-regulating unit for cigarettes according to any one of claims 3 to 5, wherein the directions in which said inner channel and said outer channel extend are parallel and not coaxial.

7. The flow regulating unit for cigarette according to claim 1, further comprising a filter assembly, wherein said filter assembly is configured to interface with an end of said restriction member.

8. The flow conditioning unit for cigarettes according to claim 7, wherein the filter assembly comprises a blank pipe section and a filter element, one end of the blank pipe section is butted against one end of the filter element, and the other end of the filter element is butted against an end of the throttling element where the inner communication port is formed.

9. A filter rod, characterized in that it comprises:

a filter stick main body; and

the flow regulating unit for cigarettes according to any one of claims 1 to 8, wherein the end of the throttling element of the flow regulating unit on which the external communication port is formed is butted against the plug body.

10. A cigarette, comprising:

a cigarette body;

a filter according to claim 9, wherein said filter is docked to said cigarette body.